diff --git a/.gitignore b/.gitignore
index 414acfd..7d23acb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,12 @@ tmp/
 temp/
 *.tmp
 
+# Android / Gradle
+.gradle/
+*/.gradle/
+local.properties
+*/local.properties
+
 # SQL scripts (optional - nur wenn sie sensible Daten enthalten)
 # backend/*.sql
 
diff --git a/ANDROID_FRONTEND_PLAN.md b/ANDROID_FRONTEND_PLAN.md
new file mode 100644
index 0000000..5172c59
--- /dev/null
+++ b/ANDROID_FRONTEND_PLAN.md
@@ -0,0 +1,427 @@
+# Android-Frontend Plan
+
+Ziel: Ein funktional und visuell identisches Android-Frontend fuer TimeClock v3, das dieselbe Backend-API nutzt wie das bestehende Vue-Frontend und sich auf Smartphone und Tablet unterschiedlich bedienen laesst.
+
+## Ausgangslage
+
+- Bestehendes Web-Frontend: `frontend` mit Vue, Vite, Pinia und Vue Router.
+- Backend: `backend` mit REST-API unter `/api`.
+- Authentifizierung: JWT per `Authorization: Bearer <token>`.
+- Rollen: normaler Benutzer und Admin, sichtbar in der Navigation.
+- Design: helle, sachliche Web-Oberflaeche mit fester Titel-/Navigationsleiste, Statusbereich, dezenten Karten, kompakten Formularen und Bootstrap-aehnlichen Button-Zustaenden.
+- Aktuelle Hauptnavigation:
+  - Buchungen: Wochenuebersicht, Zeitkorrekturen, Urlaub, Krankheit, Arbeitstage, Kalender.
+  - Export.
+  - Einstellungen: Persoenliches, Passwort aendern, Zeitwuensche, Zugriffe verwalten, Einladen.
+  - Verwaltung fuer Admins: Feiertage, Rechte.
+  - Weitere vorhandene Routen: Eintraege, Statistiken.
+
+## Empfohlene technische Basis
+
+Neue App als eigenes Modul neben Web-Frontend und Backend:
+
+```text
+mobile-app/
+```
+
+Empfehlung: Kotlin Multiplatform mit Compose Multiplatform fuer Android.
+
+Gruende:
+
+- Native Android-Bedienung und gute Tablet-Unterstuetzung.
+- Gemeinsame UI-Patterns fuer Smartphone und Tablet per adaptivem Layout.
+- Klare Trennung vom bestehenden Vue-Web-Frontend.
+- Gute Erweiterbarkeit, falls spaeter Desktop oder weitere Plattformen relevant werden.
+
+Alternative: React Native oder Expo. Das waere schneller, wenn JavaScript/TypeScript wichtiger ist als native Android-Integration. Fuer diese Codebasis ist die native Kotlin/Compose-Variante langfristig sauberer, weil das Android-Frontend eigenstaendig und nicht als WebView-Klon entstehen soll.
+
+## Nicht-Ziele
+
+- Kein WebView, das nur das bestehende Frontend einbettet.
+- Keine Backend-Neuentwicklung.
+- Keine Veraenderung der fachlichen Regeln ohne separaten Auftrag.
+- Keine Vermischung von Android-Code im bestehenden `frontend`-Verzeichnis.
+- Keine freie Neugestaltung der App. Das Android-Design soll die Webversion wiedererkennbar und konsistent nachbilden.
+
+## Design-Paritaet zur Webversion
+
+Das Android-Frontend soll von Anfang an mit einem eigenen Compose-Designsystem aufgebaut werden, das die bestehende Webversion uebersetzt statt neu zu interpretieren.
+
+### Web-Design als Quelle
+
+Primaere Quellen:
+
+- `frontend/src/assets/main.css`
+- `frontend/src/App.vue`
+- `frontend/src/components/SideMenu.vue`
+- `frontend/src/components/StatusBox.vue`
+- Styles in den einzelnen Views, soweit sie fuer konkrete Screens relevant sind.
+
+Zu uebernehmende Merkmale:
+
+- Heller Hintergrund: weiss als App-Hintergrund.
+- Textfarbe: schwarz/dunkelgrau.
+- Schrift: System-Schrift analog Web (`-apple-system`, `Segoe UI`, Roboto, Arial). Android nutzt entsprechend Roboto/System Default.
+- Navbar: feste, helle gruenliche Leiste mit `#f0ffec`, dezenter Border `#e0ffe0` und leichtem Schatten.
+- Seitentitel: kompakte Box mit hellem Hintergrund, grauem Rand und 3 px Radius.
+- Karten: `#fafafa`, Rand `#e0e0e0`, Radius 6 px, dezenter Schatten.
+- Buttons:
+  - Standard: `#f5f5f5`, Rand `#ccc`, Text `#333`.
+  - Primary: `#5bc0de`, Rand `#46b8da`, Text weiss.
+  - Success: `#5cb85c`, Rand `#4cae4c`, Text weiss.
+  - Danger: `#d9534f`, Rand `#d43f3a`, Text weiss.
+  - Secondary: `#6c757d`, Text weiss.
+- Inputs: 1 px Rand `#ddd`, 4 px Radius, 8/12 px Innenabstand, Fokusfarbe `#5bc0de`.
+- Layout: grosszuegiger horizontaler Rand auf Tablet, kompakter auf Smartphone.
+- StatusBox: eigene wiederverwendbare Komponente mit Aktionsbuttons und Statuszeilen.
+
+### Android-Designsystem
+
+In der Grundapp sollen diese Bausteine zuerst entstehen:
+
+- `TimeClockTheme`
+  - Farben aus der Webversion.
+  - Typografie auf Basis der Android-Systemschrift.
+  - Standard-Abstaende und Radien.
+- `TcScaffold`
+  - Gemeinsame App-Shell fuer angemeldete Screens.
+  - Navbar/Header, Seitentitel, Statusbereich, Content und optional Footer-Ersatz.
+- `TcTopBar`
+  - Brand `Stechuhr`, aktueller Seitentitel, Benutzerbereich, Logout.
+- `TcStatusBox`
+  - Visuell und funktional an `StatusBox.vue` angelehnt.
+  - Zuerst mit Mock-/Preview-Daten, spaeter mit API-Daten.
+- `TcButton`
+  - Varianten: default, primary, success, danger, secondary.
+  - Gleiche Farb- und Randlogik wie Web.
+- `TcCard`
+  - Kartencontainer mit Web-Radius, Rand, Hintergrund und Schatten.
+- `TcTextField`
+  - Formularfelder mit Web-Input-Stil.
+- `TcSectionMenu`
+  - Mobile und Tablet-Varianten der Web-Navigation.
+- `TcLoading`, `TcError`, `TcEmptyState`
+  - Einheitliche Zustandsanzeigen im Web-Stil.
+
+### Design-Validierung
+
+Jede neue Android-Screen-Implementierung soll gegen die Webversion geprueft werden:
+
+- Farben stimmen mit den Web-CSS-Werten ueberein.
+- Abstaende und Dichte wirken wie die Webversion, nicht wie ein neues Material-Design.
+- Buttons, Karten, Inputs und Tabellen verwenden die gemeinsamen `Tc*`-Widgets.
+- Smartphone und Tablet duerfen unterschiedlich bedient werden, muessen aber klar dieselbe TimeClock-Oberflaeche bleiben.
+- Screens werden nicht direkt mit Compose-Material-Defaults gebaut, wenn dadurch das Web-Design verloren geht.
+
+## Funktionsumfang Paritaet
+
+### Authentifizierung
+
+- Login.
+- Registrierung, falls weiterhin mobil erlaubt.
+- Passwort vergessen.
+- Passwort zuruecksetzen.
+- Passwort aendern.
+- Session-Wiederherstellung beim App-Start.
+- Logout.
+- Token sicher speichern, nicht in Klartext-Preferences.
+- OAuth/Google pruefen: Fuer Android braucht der bestehende Web-OAuth-Flow wahrscheinlich eine eigene Deep-Link- oder App-Link-Strategie.
+
+### Zeiterfassung und Buchungen
+
+- Aktueller Status aus `/time-entries/current-state`.
+- Stempeln ueber `/time-entries/clock`.
+- Laufenden Eintrag anzeigen.
+- Wochenuebersicht.
+- Zeitkorrekturen.
+- Urlaub.
+- Krankheit.
+- Arbeitstage.
+- Kalender.
+- Eintraege anzeigen, bearbeiten und loeschen, soweit im Web-Frontend vorhanden.
+- Statistiken.
+
+### Einstellungen
+
+- Persoenliches Profil.
+- Passwort aendern.
+- Zeitwuensche.
+- Zugriffe verwalten.
+- Einladen.
+
+### Export
+
+- Exportfunktion analog Web.
+- Auf Android muss geklaert werden, ob Dateien direkt heruntergeladen, geteilt oder im System-Dateidialog gespeichert werden sollen.
+
+### Admin
+
+- Feiertage.
+- Rechte/Rollen.
+- Nur sichtbar und erreichbar fuer Admin-Benutzer.
+
+## API-Schicht
+
+Die Android-App bekommt eine eigene API-Schicht, die die bestehenden Endpunkte typisiert kapselt.
+
+Vorgeschlagene Struktur:
+
+```text
+mobile-app/
+  composeApp/
+    src/
+      commonMain/
+        kotlin/
+          api/
+          auth/
+          model/
+          repository/
+          ui/
+          util/
+      androidMain/
+        kotlin/
+```
+
+API-Aufgaben:
+
+- Basis-URL konfigurierbar machen.
+- JSON-Serialisierung zentral definieren.
+- Auth-Header automatisch setzen.
+- 401 zentral behandeln und Session beenden.
+- Fehlertexte aus Backend-Antworten normalisieren.
+- Datums- und Zeitzonenlogik konsistent zur Web-App halten.
+
+## Navigation
+
+### Smartphone
+
+Smartphone-Layout priorisiert schnelle Bedienung mit einer Hand, bleibt aber visuell an der Web-Navigation orientiert.
+
+- Bottom Navigation fuer die wichtigsten Bereiche:
+  - Buchungen.
+  - Kalender.
+  - Export oder Statistik, je nach tatsaechlicher Nutzung.
+  - Einstellungen.
+- Buchungen erhalten eine eigene Unterseite mit Liste oder Tabs:
+  - Wochenuebersicht.
+  - Zeitkorrekturen.
+  - Urlaub.
+  - Krankheit.
+  - Arbeitstage.
+- Der aktuelle Stempelstatus bleibt prominent oben sichtbar.
+- Primaere Aktion `Kommen/Gehen/Pause` als klarer Hauptbutton.
+- Admin-Funktionen nicht in der Bottom Navigation, sondern unter einem Verwaltungsbereich in Einstellungen oder einem Overflow-Menue.
+
+### Tablet
+
+Tablet-Layout nutzt die Breite fuer parallele Navigation und Inhalt und kommt der Webversion am naechsten.
+
+- Permanente Navigation links als Navigation Rail oder Side Drawer.
+- Statusbereich dauerhaft im oberen Inhaltskopf.
+- Master-Detail-Ansichten, wo sinnvoll:
+  - Kalender links, Tagesdetails rechts.
+  - Wochenuebersicht links, Eintragsdetails/Bearbeitung rechts.
+  - Rollen/Feiertage mit Liste und Detailpanel.
+- Keine reine Smartphone-Skalierung auf grosse Breite.
+- Dialoge auf Tablet als zentrierte Panels oder seitliche Detailbereiche, nicht als vollflaechige Seiten, sofern der Workflow dadurch klarer bleibt.
+
+### Breakpoints
+
+Vorschlag:
+
+- Compact: Smartphone-Portrait und kleine Breiten.
+- Medium: grosse Smartphones, Foldables, kleine Tablets.
+- Expanded: Tablets im Landscape-Modus.
+
+Die konkrete Entscheidung sollte nicht nur an Pixeln haengen, sondern an Android Window Size Classes.
+
+## Screen-Liste
+
+| Web-Route | Android-Screen | Smartphone | Tablet |
+| --- | --- | --- | --- |
+| `/login` | LoginScreen | Vollbildformular | schmales Formular in ruhigem Layout |
+| `/register` | RegisterScreen | Vollbildformular | Formularpanel |
+| `/password-forgot` | PasswordForgotScreen | Vollbildformular | Formularpanel |
+| `/password-reset` | PasswordResetScreen | Deep-Link-faehig | Deep-Link-faehig |
+| `/bookings/week` | WeekOverviewScreen | Liste/Tagesgruppen | Wochenraster plus Detailbereich |
+| `/bookings/timefix` | TimefixScreen | Formular/Liste getrennt | Liste plus Bearbeitung |
+| `/bookings/vacation` | VacationScreen | Antrag und Verlauf | Kalender/Liste plus Details |
+| `/bookings/sick` | SickScreen | Antrag und Verlauf | Liste plus Details |
+| `/bookings/workdays` | WorkdaysScreen | kompakte Wochenliste | tabellarische Monats-/Wochenansicht |
+| `/calendar` | CalendarScreen | Monatsansicht mit Tagesdetails | Kalender plus Seitenpanel |
+| `/export` | ExportScreen | Filter plus Aktion | Filter links, Ergebnis/Aktion rechts |
+| `/settings/profile` | ProfileScreen | Formular | Formularpanel |
+| `/settings/password` | PasswordChangeScreen | Formular | Formularpanel |
+| `/settings/timewish` | TimewishScreen | Liste/Formular | Liste plus Detail |
+| `/settings/invite` | InviteScreen | Formular/Liste | Verwaltungspanel |
+| `/settings/permissions` | PermissionsScreen | Liste | Liste plus Detail |
+| `/admin/holidays` | HolidaysAdminScreen | Admin-Liste | Tabelle plus Detail |
+| `/admin/roles` | RolesAdminScreen | Admin-Liste | Tabelle plus Detail |
+| `/entries` | EntriesScreen | Liste mit Filtern | Tabelle plus Detail |
+| `/stats` | StatsScreen | Karten/Diagramme untereinander | Dashboard-Raster |
+
+## Datenhaltung und Offline-Verhalten
+
+Die erste fachlich nutzbare Android-Version sollte online-first bleiben:
+
+- Kein vollstaendiger Offline-Modus.
+- Token und Benutzerprofil lokal speichern.
+- Letzten bekannten aktuellen Status optional cachen.
+- Bei fehlender Verbindung klare Fehlermeldung und keine riskanten lokalen Buchungen.
+
+Optional spaeter:
+
+- Offline-Warteschlange fuer Stempelaktionen.
+- Konfliktbehandlung bei Zeitkorrekturen.
+- Lokaler Read-Cache fuer Kalender und Wochenuebersicht.
+
+## Sicherheit
+
+- Token im Android Keystore oder ueber eine sichere Storage-Abstraktion speichern.
+- Screens mit sensiblen Daten optional gegen Screenshots schuetzen, falls gewuenscht.
+- Logout loescht lokale Session vollstaendig.
+- API-Basis-URL nicht hart im Code fuer alle Umgebungen fest verdrahten.
+- OAuth-Redirects nur ueber erlaubte App-/Deep-Link-Hosts.
+
+## Projektphasen
+
+### Phase 1: Grundapp und Designsystem
+
+- `mobile-app` anlegen.
+- Android-Build lauffaehig machen.
+- `TimeClockTheme` mit Farben, Typografie, Abstaenden, Radien und Schatten aus der Webversion.
+- Grundlegende `Tc*`-Widgets: Scaffold, TopBar, StatusBox, Button, Card, TextField, SectionMenu, Loading/Error.
+- Preview-/Demo-Screens fuer Smartphone und Tablet mit Mock-Daten.
+- Adaptive Grundnavigation, aber noch ohne vollstaendige fachliche Implementierung.
+- Designabgleich mit Web-Frontend anhand der bestehenden CSS-/Vue-Komponenten.
+
+Akzeptanz:
+
+- App startet auf Emulator/Device.
+- Grundshell sieht wie die Webversion aus.
+- Smartphone und Tablet haben unterschiedliche Layouts, aber identische visuelle Sprache.
+- Neue Screens koennen auf Basis der gemeinsamen Widgets gebaut werden.
+
+### Phase 2: API- und Auth-Fundament
+
+- App-Konfiguration fuer API-Basis-URL.
+- HTTP-Client, JSON, Fehlerbehandlung.
+- Secure Token Storage.
+- Auth-Flow: Login, Logout, Session-Wiederherstellung, `/auth/me`.
+
+Akzeptanz:
+
+- Login gegen bestehendes Backend funktioniert.
+- Geschuetzter Bereich wird nach App-Neustart wiederhergestellt.
+- Auth-Screens verwenden bereits die gemeinsamen Design-Widgets.
+
+### Phase 3: Shell und adaptive Navigation
+
+- Gemeinsames App-Layout.
+- Smartphone: Bottom Navigation plus Unterbereiche.
+- Tablet: permanente Navigation plus Inhaltsbereich.
+- Rollenbasierte Sichtbarkeit.
+- Statusleiste/Statusbereich analog Web-App.
+
+Akzeptanz:
+
+- Smartphone und Tablet zeigen bewusst unterschiedliche Navigation.
+- Admin-Menues erscheinen nur fuer Admins.
+- Session-Ablauf fuehrt sauber zurueck zum Login.
+
+### Phase 4: Kern-Zeiterfassung
+
+- Aktueller Status.
+- Kommen/Gehen/Pause ueber `/time-entries/clock`.
+- Laufender Eintrag.
+- Wochenuebersicht.
+- Eintraege anzeigen.
+
+Akzeptanz:
+
+- Kernworkflow kann mobil vollstaendig genutzt werden.
+- Web und Android zeigen danach konsistente Daten.
+
+### Phase 5: Buchungs-Workflows
+
+- Zeitkorrekturen.
+- Urlaub.
+- Krankheit.
+- Arbeitstage.
+- Kalender.
+
+Akzeptanz:
+
+- Jeder Buchungsbereich deckt die Web-Funktionen ab.
+- Tablet nutzt Detailpanels, Smartphone nutzt fokussierte Einzelseiten.
+
+### Phase 6: Einstellungen
+
+- Profil.
+- Passwort aendern.
+- Zeitwuensche.
+- Zugriffe verwalten.
+- Einladen.
+- Kein Export in der Android-App, da laut Entscheidung nicht gewuenscht.
+
+Akzeptanz:
+
+- Alle Nicht-Admin-Web-Funktionen sind mobil verfuegbar.
+
+### Phase 7: Admin und Navigation
+
+- Feiertage.
+- Rollen/Rechte.
+- Menüpunkte für alle bereiche implementieren. mit submenüs arbeiten, wie in der weboberfläche
+
+Akzeptanz:
+
+- Admin-Funktionen sind mobil und auf Tablet sinnvoll bedienbar.
+- Nicht-Admins koennen sie weder sehen noch aufrufen.
+- Alle Bereiche sind ansteuerbar
+
+### Phase 8: Qualitaet
+
+- Unit-Tests fuer API/Repository/Auth.
+- UI-Tests fuer Login, Navigation und Kern-Zeiterfassung.
+- Manuelle Tests auf Smartphone- und Tablet-Emulator.
+- Dark-Mode-Entscheidung treffen: entweder sauber unterstuetzen oder explizit deaktivieren.
+- Accessibility pruefen: Touch-Zielgroessen, Kontrast, TalkBack-Beschriftungen.
+- Visuelle Regressionen zumindest ueber dokumentierte Screenshots fuer Smartphone und Tablet pruefen.
+
+## Implementierungsstand
+
+- Phase 1 umgesetzt: Grundapp, responsives App-Shell-Layout und Web-Farbdesign.
+- Phase 2 umgesetzt: Login, Session-Restore, Logout, API-Konfiguration und Token-Store.
+- Phase 3 umgesetzt: aktueller Status, Stempeln, laufender Eintrag und Wochenuebersicht.
+- Phase 4 umgesetzt: Zeitkorrekturen, Urlaub, Krankheit, Arbeitstage und Kalender.
+- Phase 5 umgesetzt: Profil, Passwort, Zeitwuensche, Zugriffe verwalten und Einladen.
+- Phase 6 umgesetzt: Admin-Feiertage und Rollen/Rechte.
+- Phase 7 umgesetzt: Smartphone-Submenues wie in der Web-Navigation, dynamische Hauptnavigation, Eintraege und Statistiken.
+- Phase 8 umgesetzt als erste Qualitaetsschicht: lokale Unit-Tests, Offline-Stempel-Queue, technischer OAuth-/Offline-Plan und erfolgreicher Test-/Buildlauf.
+- Export ist in Android aus Navigation und Menues entfernt.
+
+## Offene Entscheidungen
+
+- Soll die Android-App nur intern installiert werden oder spaeter in den Play Store? - später im playstore
+- Welche Android-Mindestversion ist gewuenscht? 15
+- Soll Registrierung in der App erlaubt sein oder nur Login? registrierung
+- Soll Google OAuth in Android direkt unterstuetzt werden oder vorerst nur E-Mail/Passwort? oauth
+- Soll Stempeln offline moeglich sein? ja
+- Welche Export-Zielform ist mobil gewuenscht: Download, Teilen, E-Mail oder System-Dateiauswahl? kein export
+- Gibt es bestehende Corporate-Design-Vorgaben ausser dem aktuellen Web-Look? nein
+- Soll der Web-Look exakt nachgebaut werden, auch wenn einzelne Material-Android-Konventionen dadurch weniger stark genutzt werden? ja.
+
+## Risiken
+
+- OAuth braucht fuer Android eine eigene Redirect-Strategie.
+- Datums-/Zeitzonenlogik kann zwischen Web, Backend und Android abweichen, wenn sie nicht frueh getestet wird.
+- Tablet-Paritaet braucht eigene Layout-Entscheidungen, sonst entsteht nur eine gestreckte Smartphone-App.
+- Backend-Endpunkte muessen fuer alle Web-Funktionen ausreichend dokumentiert oder aus den Controllern abgeleitet werden.
+- Wenn die Grundwidgets nicht zuerst stehen, entsteht spaeter schnell ein uneinheitlicher Mix aus Web-Look und Android-Material-Defaults.
+
+## Naechster sinnvoller Schritt
+
+1. OAuth-Deep-Link/Custom-Tab-Flow mit Backend-Konfiguration umsetzen.
+2. Offline-Stempeln mit UI-Anzeige, Konfliktbehandlung und Sync-Status erweitern.
+3. Compose-Screenshot-/Instrumented-Tests fuer Smartphone und Tablet ergaenzen.
diff --git a/ANDROID_TECHNICAL_NEXT_STEPS.md b/ANDROID_TECHNICAL_NEXT_STEPS.md
new file mode 100644
index 0000000..d21558f
--- /dev/null
+++ b/ANDROID_TECHNICAL_NEXT_STEPS.md
@@ -0,0 +1,58 @@
+# Android Technical Next Steps
+
+Stand: 2026-05-14
+
+## OAuth
+
+Ziel: Android soll Google OAuth direkt starten koennen, ohne WebView-Klon.
+
+Empfohlener Ablauf:
+
+1. Backend bekommt einen Android-kompatiblen OAuth-Callback mit App-Link oder Custom-Scheme.
+2. Android startet den Google-Flow ueber Browser Custom Tabs.
+3. Callback oeffnet die App per Deep Link, z.B. `timeclock://oauth-callback?token=...`.
+4. App speichert JWT im bestehenden `TokenStore` und laedt `/auth/me`.
+5. Fehlerfaelle: abgebrochener Login, abgelaufener Token, fehlender Account, Offline.
+
+Technische Punkte:
+
+- Redirect-URI muss in Google Console und Backend konfiguriert werden.
+- Token darf nicht in Logs erscheinen.
+- Der bestehende E-Mail/Passwort-Login bleibt Fallback.
+
+## Offline-Stempeln
+
+Umgesetzt als Grundfunktion:
+
+- Netzwerkfehler bei `clock(action)` speichern die Aktion lokal in `OfflineClockQueue`.
+- Beim naechsten erfolgreichen Dashboard-Refresh werden gespeicherte Aktionen in Reihenfolge synchronisiert.
+
+Noch offen fuer produktionsreife Offline-Funktion:
+
+- UI-Hinweis mit Anzahl ausstehender Aktionen.
+- Konfliktbehandlung, falls der Serverzustand nicht mehr zur Aktionsfolge passt.
+- Persistente Audit-Anzeige fuer synchronisierte/fehlgeschlagene Offline-Aktionen.
+- Tests mit simulierten Netzwerkfehlern und Wiederverbindung.
+
+## Smartphone/Tablet UI-Feinschliff
+
+Pruefpunkte mit echten Backend-Daten:
+
+- Smartphone: Bottom-Navigation + Submenue fuer Buchungen, Einstellungen, Auswertung und Verwaltung.
+- Tablet: linkes Section-Menue, Detailbereiche und breite Listen.
+- Lange Namen/E-Mail-Adressen duerfen keine Buttons oder Zeilen sprengen.
+- Admin-Listen mit vielen Benutzern/Feiertagen muessen scrollbar bleiben.
+
+## Phase 8 Teststrategie
+
+Erste lokale Tests sind angelegt fuer:
+
+- API-Serialisierung wichtiger Backend-Responses.
+- Gehashte IDs als Strings auf geschuetzten Endpunkten.
+- Offline-Queue-Serialisierung.
+
+Weitere sinnvolle Tests:
+
+- Repository-Tests mit fake API-Schicht.
+- ViewModel-Tests fuer Login, Stempeln, Offline-Queue und Rollenwechsel.
+- Compose-Screenshot-Checks fuer Smartphone und Tablet.
diff --git a/backend/src/controllers/TimeEntryController.js b/backend/src/controllers/TimeEntryController.js
index 4fb97a0..b3e8d88 100644
--- a/backend/src/controllers/TimeEntryController.js
+++ b/backend/src/controllers/TimeEntryController.js
@@ -11,7 +11,8 @@ class TimeEntryController {
    */
   async getAllEntries(req, res) {
     try {
-      const entries = timeEntryService.getAllEntries();
+      const userId = req.user?.userId;
+      const entries = await timeEntryService.getAllEntries(userId);
       res.json(entries);
     } catch (error) {
       console.error('Fehler beim Abrufen der Einträge:', error);
@@ -119,7 +120,7 @@ class TimeEntryController {
   async deleteEntry(req, res) {
     try {
       const { id } = req.params;
-      timeEntryService.deleteEntry(id);
+      await timeEntryService.deleteEntry(id);
       
       res.status(204).send();
     } catch (error) {
@@ -262,4 +263,3 @@ class TimeEntryController {
 
 // Singleton-Instanz exportieren
 module.exports = new TimeEntryController();
-
diff --git a/backend/src/services/TimefixService.js b/backend/src/services/TimefixService.js
index 4216dcc..27937b9 100644
--- a/backend/src/services/TimefixService.js
+++ b/backend/src/services/TimefixService.js
@@ -34,6 +34,10 @@ class TimefixService {
     
     // Hole auch die Timefixes für diese Einträge
     const entryIds = entries.map(e => e.id);
+    if (entryIds.length === 0) {
+      return [];
+    }
+
     const timefixesForEntries = await sequelize.query(
       `SELECT worklog_id, fix_type, fix_date_time FROM timefix WHERE worklog_id IN (?)`,
       {
@@ -349,4 +353,3 @@ class TimefixService {
 }
 
 module.exports = new TimefixService();
-
diff --git a/frontend/images/stechuhr.png b/frontend/images/stechuhr.png
new file mode 100644
index 0000000..c13effb
Binary files /dev/null and b/frontend/images/stechuhr.png differ
diff --git a/frontend/index.html b/frontend/index.html
index e767280..b5b7ab8 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -2,7 +2,9 @@
 <html lang="de">
   <head>
     <meta charset="UTF-8">
-    <link rel="icon" href="/favicon.ico">
+    <link rel="icon" href="/favicon.ico" sizes="any">
+    <link rel="icon" type="image/png" href="/stechuhr.png">
+    <link rel="apple-touch-icon" href="/stechuhr.png">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>TimeClock v3 - Zeiterfassung</title>
   </head>
diff --git a/frontend/public/favicon.ico b/frontend/public/favicon.ico
new file mode 100644
index 0000000..98c2d2a
Binary files /dev/null and b/frontend/public/favicon.ico differ
diff --git a/frontend/public/stechuhr.png b/frontend/public/stechuhr.png
new file mode 100644
index 0000000..c13effb
Binary files /dev/null and b/frontend/public/stechuhr.png differ
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 00d9630..6384b76 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -3,9 +3,7 @@
     <div class="navbar" v-if="authStore.isAuthenticated">
       <div class="navbar-inner">
         <div class="container">
-          <h1 class="brand">
-            <RouterLink to="/">Stechuhr</RouterLink>
-          </h1>
+          <AppBrand />
           <div class="nav-title-menu">
             <h2 class="page-title" v-if="pageTitle">{{ pageTitle }}</h2>
             <div class="nav-collapse">
@@ -47,12 +45,13 @@
 </template>
 
 <script setup>
-import { RouterLink, RouterView, useRoute } from 'vue-router'
+import { RouterView, useRoute } from 'vue-router'
 import { useAuthStore } from './stores/authStore'
 import { useRouter } from 'vue-router'
 import { computed } from 'vue'
 import StatusBox from './components/StatusBox.vue'
 import SideMenu from './components/SideMenu.vue'
+import AppBrand from './components/AppBrand.vue'
 
 const authStore = useAuthStore()
 const router = useRouter()
@@ -133,24 +132,6 @@ const pageTitle = computed(() => {
   flex-direction: row;
 }
 
-.brand {
-  margin: 0;
-  padding: 0;
-}
-
-.brand a {
-  font-weight: bold;
-  color: #000;
-  padding: 12px 20px 12px 0;
-  font-size: 24px;
-  text-decoration: none;
-  transition: color 0.2s;
-}
-
-.brand a:hover {
-  color: #333;
-}
-
 .nav-collapse {
   display: flex;
   width: 100%;
diff --git a/frontend/src/components/AppBrand.vue b/frontend/src/components/AppBrand.vue
new file mode 100644
index 0000000..bae1f7f
--- /dev/null
+++ b/frontend/src/components/AppBrand.vue
@@ -0,0 +1,54 @@
+<template>
+  <h1 class="brand">
+    <RouterLink :to="to" class="brand-link">
+      <img src="/stechuhr.png" alt="Stechuhr" class="brand-logo" width="32" height="32" />
+      <span class="brand-text">Stechuhr</span>
+    </RouterLink>
+  </h1>
+</template>
+
+<script setup>
+import { RouterLink } from 'vue-router'
+
+defineProps({
+  to: {
+    type: String,
+    default: '/',
+  },
+})
+</script>
+
+<style scoped>
+.brand {
+  margin: 0;
+  padding: 0;
+}
+
+.brand-link {
+  display: inline-flex;
+  align-items: center;
+  gap: 10px;
+  font-weight: bold;
+  color: #000;
+  padding: 8px 20px 8px 0;
+  font-size: 24px;
+  text-decoration: none;
+  transition: color 0.2s;
+}
+
+.brand-link:hover {
+  color: #333;
+}
+
+.brand-logo {
+  display: block;
+  flex-shrink: 0;
+  width: 32px;
+  height: 32px;
+  object-fit: contain;
+}
+
+.brand-text {
+  line-height: 1;
+}
+</style>
diff --git a/frontend/src/views/Login.vue b/frontend/src/views/Login.vue
index 6712693..4a3968e 100644
--- a/frontend/src/views/Login.vue
+++ b/frontend/src/views/Login.vue
@@ -3,9 +3,7 @@
     <div class="navbar">
       <div class="navbar-inner">
         <div class="container">
-          <h1 class="brand">
-            <router-link to="/">Stechuhr</router-link>
-          </h1>
+          <AppBrand />
         </div>
       </div>
     </div>
@@ -115,6 +113,7 @@ import { ref } from 'vue'
 import { useRouter } from 'vue-router'
 import { useAuthStore } from '../stores/authStore'
 import { API_BASE_URL } from '@/config/api'
+import AppBrand from '../components/AppBrand.vue'
 
 const API_URL = API_BASE_URL
 const router = useRouter()
@@ -189,24 +188,6 @@ body {
   border-bottom: 1px solid #e0ffe0;
 }
 
-.brand {
-  margin: 0;
-  padding: 0;
-}
-
-.brand a {
-  font-weight: bold;
-  color: #000;
-  padding: 12px 20px 12px 0;
-  font-size: 24px;
-  text-decoration: none;
-  transition: color 0.2s;
-}
-
-.brand a:hover {
-  color: #333;
-}
-
 .contents {
   flex: 1;
   display: flex;
diff --git a/frontend/src/views/PasswordForgot.vue b/frontend/src/views/PasswordForgot.vue
index 50ceb50..045787b 100644
--- a/frontend/src/views/PasswordForgot.vue
+++ b/frontend/src/views/PasswordForgot.vue
@@ -3,9 +3,7 @@
     <div class="navbar">
       <div class="navbar-inner">
         <div class="container">
-          <h1 class="brand">
-            <router-link to="/">Stechuhr</router-link>
-          </h1>
+          <AppBrand />
         </div>
       </div>
     </div>
@@ -69,6 +67,7 @@
 <script setup>
 import { ref } from 'vue'
 import { useAuthStore } from '../stores/authStore'
+import AppBrand from '../components/AppBrand.vue'
 
 const authStore = useAuthStore()
 const email = ref('')
@@ -137,24 +136,6 @@ const copyResetLink = async () => {
   border-bottom: 1px solid #e0ffe0;
 }
 
-.brand {
-  margin: 0;
-  padding: 0;
-}
-
-.brand a {
-  font-weight: bold;
-  color: #000;
-  padding: 12px 20px 12px 0;
-  font-size: 24px;
-  text-decoration: none;
-  transition: color 0.2s;
-}
-
-.brand a:hover {
-  color: #333;
-}
-
 .contents {
   flex: 1;
   display: flex;
diff --git a/frontend/src/views/PasswordReset.vue b/frontend/src/views/PasswordReset.vue
index c236008..49c844f 100644
--- a/frontend/src/views/PasswordReset.vue
+++ b/frontend/src/views/PasswordReset.vue
@@ -3,9 +3,7 @@
     <div class="navbar">
       <div class="navbar-inner">
         <div class="container">
-          <h1 class="brand">
-            <router-link to="/">Stechuhr</router-link>
-          </h1>
+          <AppBrand />
         </div>
       </div>
     </div>
@@ -81,6 +79,7 @@
 import { ref, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
 import { useAuthStore } from '../stores/authStore'
+import AppBrand from '../components/AppBrand.vue'
 
 const route = useRoute()
 const authStore = useAuthStore()
@@ -143,24 +142,6 @@ const handleReset = async () => {
   border-bottom: 1px solid #e0ffe0;
 }
 
-.brand {
-  margin: 0;
-  padding: 0;
-}
-
-.brand a {
-  font-weight: bold;
-  color: #000;
-  padding: 12px 20px 12px 0;
-  font-size: 24px;
-  text-decoration: none;
-  transition: color 0.2s;
-}
-
-.brand a:hover {
-  color: #333;
-}
-
 .contents {
   flex: 1;
   display: flex;
diff --git a/frontend/src/views/Register.vue b/frontend/src/views/Register.vue
index 1791c52..7e69111 100644
--- a/frontend/src/views/Register.vue
+++ b/frontend/src/views/Register.vue
@@ -3,9 +3,7 @@
     <div class="navbar">
       <div class="navbar-inner">
         <div class="container">
-          <h1 class="brand">
-            <router-link to="/">Stechuhr</router-link>
-          </h1>
+          <AppBrand />
         </div>
       </div>
     </div>
@@ -96,6 +94,7 @@
 import { ref } from 'vue'
 import { useRouter } from 'vue-router'
 import { useAuthStore } from '../stores/authStore'
+import AppBrand from '../components/AppBrand.vue'
 
 const router = useRouter()
 const authStore = useAuthStore()
@@ -163,24 +162,6 @@ const handleRegister = async () => {
   border-bottom: 1px solid #e0ffe0;
 }
 
-.brand {
-  margin: 0;
-  padding: 0;
-}
-
-.brand a {
-  font-weight: bold;
-  color: #000;
-  padding: 12px 20px 12px 0;
-  font-size: 24px;
-  text-decoration: none;
-  transition: color 0.2s;
-}
-
-.brand a:hover {
-  color: #333;
-}
-
 .contents {
   flex: 1;
   display: flex;
diff --git a/mobile-app/README.md b/mobile-app/README.md
new file mode 100644
index 0000000..c8deca3
--- /dev/null
+++ b/mobile-app/README.md
@@ -0,0 +1,67 @@
+# TimeClock Android Frontend
+
+Phase 1 enthält die native Android-Grundapp und die gemeinsamen Compose-Design-Widgets.
+
+**Phase 2 (API- und Auth-Fundament)** ist umgesetzt:
+
+- Konfigurierbare API-Basis-URL (`BuildConfig.API_BASE_URL`), Standard: `https://stechuhr3.tsschulz.de/api`.
+- HTTP mit OkHttp, JSON mit kotlinx.serialization, normalisierte Fehler (`ApiException`).
+- JWT in **EncryptedSharedPreferences** (AndroidX Security Crypto), nicht im Klartext.
+- **Login** (`POST /auth/login`), **Logout** (`POST /auth/logout`), **Session-Wiederherstellung** (`GET /auth/me` beim App-Start).
+- Login-Oberfläche mit den bestehenden `Tc*`-Widgets; nach Anmeldung die Phase‑1-Demo-Shell mit echtem Benutzernamen und rollenbasierter Navigation (Admin-Zusatzmenü nur bei `role == 1`).
+- Debug-Build: Cleartext-HTTP erlaubt (`composeApp/src/debug/AndroidManifest.xml`) für lokales Testen.
+
+**Phase 3 (Kern-Zeiterfassung)** ist umgesetzt:
+
+- Echter aktueller Status über `GET /time-entries/current-state`.
+- Stempelaktionen über `POST /time-entries/clock`.
+- Laufender Eintrag über `GET /time-entries/running`.
+- StatusBox mit echten Zeiten und Aktionsbuttons.
+- Tages-/Wochenwerte über `GET /time-entries/stats/summary`.
+- Wochenübersicht über `GET /week-overview?weekOffset=...`.
+- Automatische Status-Aktualisierung alle 30 Sekunden nach Anmeldung.
+
+**Phase 4 (Buchungs-Workflows)** ist umgesetzt:
+
+- Zeitkorrekturen: Worklog-Einträge nach Datum, heutige Korrekturen, Erstellen und Löschen.
+- Urlaub: Liste, Erstellen und Löschen.
+- Krankheit: Krankheitstypen, Liste, Erstellen und Löschen.
+- Arbeitstage: Jahresstatistik.
+- Kalender: Monatsansicht mit Feiertag, Krankheit, Urlaub und Arbeitsstunden.
+
+## API-URL setzen
+
+In `mobile-app/local.properties` (wird typischerweise nicht eingecheckt):
+
+```properties
+# Beispiel: lokales Backend im Emulator (Host-Rechner)
+timeclock.api.baseUrl=http://10.0.2.2:3010/api
+```
+
+oder beim Gradle-Aufruf:
+
+```bash
+# Beispiel: lokales Backend statt Standard-Server
+./gradlew :composeApp:assembleDebug -Ptimeclock.api.baseUrl=http://10.0.2.2:3010/api
+```
+
+## Scope (Phase 1)
+
+- Native Android-App unter `composeApp`.
+- Web-inspiriertes Designsystem an `frontend/src/assets/main.css`, `App.vue`, `SideMenu.vue` und `StatusBox.vue`.
+- Adaptive Shell: schmale Breiten mit Top-Bar und Bottom-Navigation, Tablet mit persistenter Seitennavigation.
+- Nicht umgesetzte Einstellungs-/Admin-Screens bleiben vorerst Demo/Mock; StatusBox, Wochenübersicht und Buchungs-Workflows verwenden echte Backend-Daten.
+
+## Build
+
+Aus diesem Verzeichnis:
+
+```bash
+./gradlew :composeApp:assembleDebug
+```
+
+Beispiel mit eigenem Gradle-Cache:
+
+```bash
+GRADLE_USER_HOME=/tmp/gradle-home ./gradlew :composeApp:assembleDebug --no-daemon
+```
diff --git a/mobile-app/build.gradle.kts b/mobile-app/build.gradle.kts
new file mode 100644
index 0000000..7cd342d
--- /dev/null
+++ b/mobile-app/build.gradle.kts
@@ -0,0 +1,5 @@
+plugins {
+    id("com.android.application") version "9.1.1" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.2.20" apply false
+    id("org.jetbrains.kotlin.plugin.serialization") version "2.2.20" apply false
+}
diff --git a/mobile-app/composeApp/build.gradle.kts b/mobile-app/composeApp/build.gradle.kts
new file mode 100644
index 0000000..1dbc36b
--- /dev/null
+++ b/mobile-app/composeApp/build.gradle.kts
@@ -0,0 +1,65 @@
+import java.util.Properties
+
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.plugin.compose")
+    id("org.jetbrains.kotlin.plugin.serialization")
+}
+
+val localProps = rootProject.file("local.properties").takeIf { it.exists() }?.reader()?.use {
+    Properties().apply { load(it) }
+}
+
+val apiBaseUrl: String =
+    (project.findProperty("timeclock.api.baseUrl") as String?)
+        ?: localProps?.getProperty("timeclock.api.baseUrl")
+        ?: "https://stechuhr3.tsschulz.de/api"
+
+android {
+    namespace = "de.tsschulz.timeclock"
+    compileSdk = 36
+
+    defaultConfig {
+        applicationId = "de.tsschulz.timeclock"
+        minSdk = 26
+        targetSdk = 36
+        versionCode = 3
+        versionName = "0.8.0-alpha2"
+        buildConfigField("String", "API_BASE_URL", "\"${apiBaseUrl.replace("\\", "\\\\").replace("\"", "\\\"")}\"")
+    }
+
+    buildFeatures {
+        compose = true
+        buildConfig = true
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+}
+
+dependencies {
+    implementation(platform("androidx.compose:compose-bom:2026.03.01"))
+    implementation("androidx.activity:activity-compose:1.13.0")
+    implementation("androidx.compose.foundation:foundation")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.compose.material:material-icons-core")
+    implementation("androidx.compose.material:material-icons-extended")
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-text")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("androidx.core:core-ktx:1.18.0")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.10.0")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.10.0")
+    implementation("androidx.lifecycle:lifecycle-runtime-compose:2.10.0")
+    implementation("androidx.security:security-crypto:1.1.0-alpha06")
+    implementation("com.squareup.okhttp3:okhttp:4.12.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.10.2")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.0")
+
+    testImplementation("junit:junit:4.13.2")
+    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.2")
+    testImplementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.0")
+
+    debugImplementation("androidx.compose.ui:ui-tooling")
+}
diff --git a/mobile-app/composeApp/release/composeApp-release.aab b/mobile-app/composeApp/release/composeApp-release.aab
new file mode 100644
index 0000000..be780df
Binary files /dev/null and b/mobile-app/composeApp/release/composeApp-release.aab differ
diff --git a/mobile-app/composeApp/src/debug/AndroidManifest.xml b/mobile-app/composeApp/src/debug/AndroidManifest.xml
new file mode 100644
index 0000000..5a3825a
--- /dev/null
+++ b/mobile-app/composeApp/src/debug/AndroidManifest.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- HTTP-Cleartext für lokale Dev-URLs (z. B. http://10.0.2.2:3010/api über local.properties) -->
+    <application android:usesCleartextTraffic="true" />
+</manifest>
diff --git a/mobile-app/composeApp/src/main/AndroidManifest.xml b/mobile-app/composeApp/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..3df365b
--- /dev/null
+++ b/mobile-app/composeApp/src/main/AndroidManifest.xml
@@ -0,0 +1,20 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="Stechuhr"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.TimeClock">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/MainActivity.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/MainActivity.kt
new file mode 100644
index 0000000..56df0e8
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/MainActivity.kt
@@ -0,0 +1,45 @@
+package de.tsschulz.timeclock
+
+import android.graphics.Color
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.core.view.WindowCompat
+import androidx.lifecycle.viewmodel.compose.viewModel
+import de.tsschulz.timeclock.ui.TimeClockApp
+import de.tsschulz.timeclock.ui.admin.AdminViewModel
+import de.tsschulz.timeclock.ui.auth.AuthViewModel
+import de.tsschulz.timeclock.ui.booking.BookingViewModel
+import de.tsschulz.timeclock.ui.settings.SettingsViewModel
+import de.tsschulz.timeclock.ui.theme.TimeClockTheme
+import de.tsschulz.timeclock.ui.time.TimeViewModel
+
+class MainActivity : ComponentActivity() {
+    @Suppress("DEPRECATION")
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        window.statusBarColor = Color.rgb(240, 255, 236)
+        window.navigationBarColor = Color.WHITE
+        setContent {
+            val authViewModel: AuthViewModel = viewModel(factory = AuthViewModel.Factory(application))
+            val timeViewModel: TimeViewModel = viewModel(factory = TimeViewModel.Factory(application))
+            val bookingViewModel: BookingViewModel = viewModel(factory = BookingViewModel.Factory(application))
+            val settingsViewModel: SettingsViewModel = viewModel(factory = SettingsViewModel.Factory(application))
+            val adminViewModel: AdminViewModel = viewModel(factory = AdminViewModel.Factory(application))
+            TimeClockTheme {
+                TimeClockApp(
+                    authViewModel = authViewModel,
+                    timeViewModel = timeViewModel,
+                    bookingViewModel = bookingViewModel,
+                    settingsViewModel = settingsViewModel,
+                    adminViewModel = adminViewModel,
+                )
+            }
+        }
+        window.decorView.post {
+            val controller = WindowCompat.getInsetsController(window, window.decorView)
+            controller.isAppearanceLightStatusBars = true
+            controller.isAppearanceLightNavigationBars = true
+        }
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/config/AppConfig.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/config/AppConfig.kt
new file mode 100644
index 0000000..24e0206
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/config/AppConfig.kt
@@ -0,0 +1,8 @@
+package de.tsschulz.timeclock.config
+
+import de.tsschulz.timeclock.BuildConfig
+
+object AppConfig {
+    /** Basis-URL inkl. `/api`-Suffix (Default aus `BuildConfig`, siehe `composeApp/build.gradle.kts`). */
+    val apiBaseUrl: String = BuildConfig.API_BASE_URL
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/admin/AdminRepository.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/admin/AdminRepository.kt
new file mode 100644
index 0000000..5764a7c
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/admin/AdminRepository.kt
@@ -0,0 +1,20 @@
+package de.tsschulz.timeclock.data.admin
+
+import de.tsschulz.timeclock.data.api.HolidayCreateRequest
+import de.tsschulz.timeclock.data.api.HolidayStateDto
+import de.tsschulz.timeclock.data.api.HolidaysResponse
+import de.tsschulz.timeclock.data.api.RoleUserDto
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+
+class AdminRepository(
+    private val api: TimeClockApiClient,
+) {
+    suspend fun getHolidayStates(): List<HolidayStateDto> = api.getHolidayStates()
+    suspend fun getHolidays(): HolidaysResponse = api.getHolidays()
+    suspend fun createHoliday(date: String, hours: Double, description: String, stateIds: List<String>) =
+        api.createHoliday(HolidayCreateRequest(date, hours, description, stateIds))
+    suspend fun deleteHoliday(id: String) = api.deleteHoliday(id)
+
+    suspend fun getRoleUsers(): List<RoleUserDto> = api.getRoleUsers()
+    suspend fun updateUserRole(id: String, role: Int) = api.updateUserRole(id, role)
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/AdminDtos.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/AdminDtos.kt
new file mode 100644
index 0000000..fba704c
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/AdminDtos.kt
@@ -0,0 +1,47 @@
+package de.tsschulz.timeclock.data.api
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class HolidayStateDto(
+    val id: String,
+    val name: String,
+)
+
+@Serializable
+data class HolidayDto(
+    val id: String,
+    val date: String,
+    val hours: Double = 8.0,
+    val description: String,
+    val states: List<String> = emptyList(),
+    val isFederal: Boolean = true,
+)
+
+@Serializable
+data class HolidaysResponse(
+    val future: List<HolidayDto> = emptyList(),
+    val past: List<HolidayDto> = emptyList(),
+)
+
+@Serializable
+data class HolidayCreateRequest(
+    val date: String,
+    val hours: Double,
+    val description: String,
+    val stateIds: List<String> = emptyList(),
+)
+
+@Serializable
+data class RoleUserDto(
+    val id: String,
+    val fullName: String,
+    val role: Int = 0,
+    val roleString: String = "user",
+    val stateName: String? = null,
+)
+
+@Serializable
+data class RoleUpdateRequest(
+    val role: Int,
+)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/ApiException.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/ApiException.kt
new file mode 100644
index 0000000..3276750
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/ApiException.kt
@@ -0,0 +1,6 @@
+package de.tsschulz.timeclock.data.api
+
+class ApiException(
+    message: String,
+    val code: Int,
+) : Exception(message)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/AuthDtos.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/AuthDtos.kt
new file mode 100644
index 0000000..03eedfa
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/AuthDtos.kt
@@ -0,0 +1,52 @@
+package de.tsschulz.timeclock.data.api
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class LoginRequest(
+    val email: String,
+    val password: String,
+    /** Entspricht dem Web-Login: `0` = keine Stempelaktion. */
+    val action: String = "0",
+)
+
+@Serializable
+data class LoginResponse(
+    val success: Boolean = false,
+    val token: String? = null,
+    val user: UserDto? = null,
+    val message: String? = null,
+    val error: String? = null,
+    val actionWarning: String? = null,
+)
+
+@Serializable
+data class MeResponse(
+    val success: Boolean = false,
+    val user: UserDto? = null,
+    val error: String? = null,
+)
+
+@Serializable
+data class UserDto(
+    val id: Int,
+    @SerialName("full_name") val fullName: String,
+    val email: String? = null,
+    val role: Int = 0,
+    @SerialName("daily_hours") val dailyHours: Double? = null,
+    @SerialName("week_hours") val weekHours: Double? = null,
+    @SerialName("week_workdays") val weekWorkdays: Int? = null,
+)
+
+@Serializable
+data class ErrorBody(
+    val error: String? = null,
+    val message: String? = null,
+)
+
+@Serializable
+data class LogoutResponse(
+    val success: Boolean = true,
+    val message: String? = null,
+)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/BookingDtos.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/BookingDtos.kt
new file mode 100644
index 0000000..b5002ae
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/BookingDtos.kt
@@ -0,0 +1,106 @@
+package de.tsschulz.timeclock.data.api
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class VacationDto(
+    val id: String,
+    val type: String? = null,
+    val typeValue: Int = 0,
+    val startDate: String? = null,
+    val endDate: String? = null,
+)
+
+@Serializable
+data class VacationCreateRequest(
+    val vacationType: Int,
+    val startDate: String,
+    val endDate: String? = null,
+)
+
+@Serializable
+data class SickEntryDto(
+    val id: String,
+    val startDate: String? = null,
+    val endDate: String? = null,
+    val sickTypeId: Int? = null,
+    val sickTypeName: String? = null,
+)
+
+@Serializable
+data class SickTypeDto(
+    val id: String,
+    val name: String,
+)
+
+@Serializable
+data class SickCreateRequest(
+    val sickTypeId: String,
+    val startDate: String,
+    val endDate: String? = null,
+)
+
+@Serializable
+data class TimefixDto(
+    val id: String,
+    val worklogId: String? = null,
+    val newDate: String? = null,
+    val newTime: String? = null,
+    val newAction: String? = null,
+    val originalDate: String? = null,
+    val originalTime: String? = null,
+    val originalAction: String? = null,
+)
+
+@Serializable
+data class WorklogEntryDto(
+    val id: String,
+    val time: String? = null,
+    val action: String? = null,
+    val tstamp: String? = null,
+)
+
+@Serializable
+data class TimefixCreateRequest(
+    val worklogId: String,
+    val newDate: String,
+    val newTime: String,
+    val newAction: String,
+)
+
+@Serializable
+data class WorkdaysDto(
+    val year: Int,
+    val workdays: Int = 0,
+    val holidays: Int = 0,
+    val sickDays: Double = 0.0,
+    val sickPercentage: Int = 0,
+    val vacationDays: Double = 0.0,
+    val workedDays: Int = 0,
+)
+
+@Serializable
+data class CalendarDto(
+    val year: Int,
+    val month: Int,
+    val weeks: List<List<CalendarDayDto>> = emptyList(),
+)
+
+@Serializable
+data class CalendarDayDto(
+    val date: String,
+    val day: Int,
+    val isCurrentMonth: Boolean = false,
+    val isToday: Boolean = false,
+    val holiday: String? = null,
+    val sick: Boolean = false,
+    val vacation: String? = null,
+    val workedHours: Double? = null,
+)
+
+@Serializable
+data class MessageResponse(
+    val message: String? = null,
+    val error: String? = null,
+)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/SettingsDtos.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/SettingsDtos.kt
new file mode 100644
index 0000000..627f8c4
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/SettingsDtos.kt
@@ -0,0 +1,86 @@
+package de.tsschulz.timeclock.data.api
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class ProfileDto(
+    val id: String? = null,
+    val fullName: String = "",
+    val email: String? = null,
+    val stateId: String? = null,
+    val stateName: String? = null,
+    val weekWorkdays: Int? = null,
+    val dailyHours: Double? = null,
+    val preferredTitleType: Int? = null,
+)
+
+@Serializable
+data class StateDto(
+    val id: String,
+    val name: String,
+)
+
+@Serializable
+data class ProfileUpdateRequest(
+    val fullName: String,
+    val stateId: String? = null,
+    val weekWorkdays: Int,
+    val dailyHours: Double,
+    val preferredTitleType: Int,
+)
+
+@Serializable
+data class PasswordChangeRequest(
+    val oldPassword: String,
+    val newPassword: String,
+    val confirmPassword: String,
+)
+
+@Serializable
+data class TimewishDto(
+    val id: String,
+    val day: Int,
+    val dayName: String? = null,
+    val wishtype: Int,
+    val wishtypeName: String? = null,
+    val hours: Double? = null,
+    val startDate: String? = null,
+    val endDate: String? = null,
+)
+
+@Serializable
+data class TimewishCreateRequest(
+    val day: Int,
+    val wishtype: Int,
+    val hours: Double? = null,
+    val startDate: String,
+    val endDate: String? = null,
+)
+
+@Serializable
+data class InvitationDto(
+    val id: String,
+    val email: String,
+    val createdAt: String? = null,
+    val expiresAt: String? = null,
+    val status: String? = null,
+    val isExpired: Boolean = false,
+    val token: String? = null,
+)
+
+@Serializable
+data class InviteRequest(
+    val email: String,
+)
+
+@Serializable
+data class WatcherDto(
+    val id: String,
+    val email: String,
+    val createdAt: String? = null,
+)
+
+@Serializable
+data class WatcherRequest(
+    val email: String,
+)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/TimeClockApiClient.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/TimeClockApiClient.kt
new file mode 100644
index 0000000..d5c0cbd
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/TimeClockApiClient.kt
@@ -0,0 +1,289 @@
+package de.tsschulz.timeclock.data.api
+
+import de.tsschulz.timeclock.config.AppConfig
+import de.tsschulz.timeclock.data.auth.TokenStore
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.Json
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import okhttp3.RequestBody.Companion.toRequestBody
+import java.util.concurrent.TimeUnit
+
+private val JsonMedia = "application/json; charset=utf-8".toMediaType()
+
+class TimeClockApiClient(
+    private val tokenStore: TokenStore,
+    private val json: Json = Json {
+        ignoreUnknownKeys = true
+        isLenient = true
+        coerceInputValues = true
+    },
+    private val client: OkHttpClient = OkHttpClient.Builder()
+        .connectTimeout(30, TimeUnit.SECONDS)
+        .readTimeout(30, TimeUnit.SECONDS)
+        .build(),
+    private val baseUrl: String = AppConfig.apiBaseUrl,
+) {
+
+    private fun endpoint(path: String): String {
+        val base = baseUrl.trimEnd('/')
+        val p = path.trimStart('/')
+        return "$base/$p"
+    }
+
+    suspend fun postLogin(body: LoginRequest): LoginResponse {
+        val raw = execute(
+            Request.Builder()
+                .url(endpoint("auth/login"))
+                .post(json.encodeToString(LoginRequest.serializer(), body).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(LoginResponse.serializer(), raw)
+    }
+
+    suspend fun getMe(): MeResponse {
+        val t = tokenStore.getToken() ?: throw ApiException("Nicht angemeldet", 401)
+        val raw = execute(
+            Request.Builder()
+                .url(endpoint("auth/me"))
+                .header("Authorization", "Bearer $t")
+                .get()
+                .build(),
+        )
+        return decode(MeResponse.serializer(), raw)
+    }
+
+    suspend fun postLogout(): LogoutResponse {
+        val t = tokenStore.getToken() ?: throw ApiException("Nicht angemeldet", 401)
+        val raw = execute(
+            Request.Builder()
+                .url(endpoint("auth/logout"))
+                .header("Authorization", "Bearer $t")
+                .post("{}".toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(LogoutResponse.serializer(), raw.ifBlank { "{}" })
+    }
+
+    suspend fun getCurrentState(): CurrentStateResponse {
+        val raw = execute(authorized("time-entries/current-state").get().build())
+        return decode(CurrentStateResponse.serializer(), raw)
+    }
+
+    suspend fun getRunningEntry(): RunningEntryDto {
+        val raw = execute(authorized("time-entries/running").get().build())
+        return decode(RunningEntryDto.serializer(), raw.ifBlank { "{}" })
+    }
+
+    suspend fun getTimeStats(): TimeStatsDto {
+        val raw = execute(authorized("time-entries/stats/summary").get().build())
+        return decode(TimeStatsDto.serializer(), raw.ifBlank { "{}" })
+    }
+
+    suspend fun postClock(action: String): ClockResponse {
+        val raw = execute(
+            authorized("time-entries/clock")
+                .post(json.encodeToString(ClockRequest.serializer(), ClockRequest(action)).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(ClockResponse.serializer(), raw)
+    }
+
+    suspend fun getWeekOverview(weekOffset: Int): WeekOverviewResponse {
+        val raw = execute(authorized("week-overview?weekOffset=$weekOffset").get().build())
+        return decode(WeekOverviewResponse.serializer(), raw)
+    }
+
+    suspend fun getTimeEntries(): List<TimeEntryDto> =
+        decode(ListSerializer(TimeEntryDto.serializer()), execute(authorized("time-entries").get().build()))
+
+    suspend fun deleteTimeEntry(id: String) {
+        execute(authorized("time-entries/$id").delete().build())
+    }
+
+    suspend fun getVacations(): List<VacationDto> =
+        decode(ListSerializer(VacationDto.serializer()), execute(authorized("vacation").get().build()))
+
+    suspend fun createVacation(request: VacationCreateRequest) {
+        execute(
+            authorized("vacation")
+                .post(json.encodeToString(VacationCreateRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+    }
+
+    suspend fun deleteVacation(id: String) {
+        execute(authorized("vacation/$id").delete().build())
+    }
+
+    suspend fun getSickEntries(): List<SickEntryDto> =
+        decode(ListSerializer(SickEntryDto.serializer()), execute(authorized("sick").get().build()))
+
+    suspend fun getSickTypes(): List<SickTypeDto> =
+        decode(ListSerializer(SickTypeDto.serializer()), execute(authorized("sick/types").get().build()))
+
+    suspend fun createSick(request: SickCreateRequest) {
+        execute(
+            authorized("sick")
+                .post(json.encodeToString(SickCreateRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+    }
+
+    suspend fun deleteSick(id: String) {
+        execute(authorized("sick/$id").delete().build())
+    }
+
+    suspend fun getTimefixes(): List<TimefixDto> =
+        decode(ListSerializer(TimefixDto.serializer()), execute(authorized("timefix").get().build()))
+
+    suspend fun getWorklogEntries(date: String): List<WorklogEntryDto> =
+        decode(ListSerializer(WorklogEntryDto.serializer()), execute(authorized("timefix/worklog-entries?date=$date").get().build()))
+
+    suspend fun createTimefix(request: TimefixCreateRequest) {
+        execute(
+            authorized("timefix")
+                .post(json.encodeToString(TimefixCreateRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+    }
+
+    suspend fun deleteTimefix(id: String) {
+        execute(authorized("timefix/$id").delete().build())
+    }
+
+    suspend fun getWorkdays(year: Int): WorkdaysDto =
+        decode(WorkdaysDto.serializer(), execute(authorized("workdays?year=$year").get().build()))
+
+    suspend fun getCalendar(year: Int, month: Int): CalendarDto =
+        decode(CalendarDto.serializer(), execute(authorized("calendar?year=$year&month=$month").get().build()))
+
+    suspend fun getProfile(): ProfileDto =
+        decode(ProfileDto.serializer(), execute(authorized("profile").get().build()))
+
+    suspend fun getStates(): List<StateDto> =
+        decode(ListSerializer(StateDto.serializer()), execute(authorized("profile/states").get().build()))
+
+    suspend fun updateProfile(request: ProfileUpdateRequest): MessageResponse {
+        val raw = execute(
+            authorized("profile")
+                .put(json.encodeToString(ProfileUpdateRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(MessageResponse.serializer(), raw.ifBlank { "{}" })
+    }
+
+    suspend fun changePassword(request: PasswordChangeRequest): MessageResponse {
+        val raw = execute(
+            authorized("password")
+                .put(json.encodeToString(PasswordChangeRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(MessageResponse.serializer(), raw.ifBlank { "{}" })
+    }
+
+    suspend fun getTimewishes(): List<TimewishDto> =
+        decode(ListSerializer(TimewishDto.serializer()), execute(authorized("timewish").get().build()))
+
+    suspend fun createTimewish(request: TimewishCreateRequest): MessageResponse {
+        val raw = execute(
+            authorized("timewish")
+                .post(json.encodeToString(TimewishCreateRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(MessageResponse.serializer(), raw.ifBlank { "{}" })
+    }
+
+    suspend fun deleteTimewish(id: String) {
+        execute(authorized("timewish/$id").delete().build())
+    }
+
+    suspend fun getInvites(): List<InvitationDto> =
+        decode(ListSerializer(InvitationDto.serializer()), execute(authorized("invite").get().build()))
+
+    suspend fun sendInvite(request: InviteRequest): InvitationDto {
+        val raw = execute(
+            authorized("invite")
+                .post(json.encodeToString(InviteRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(InvitationDto.serializer(), raw)
+    }
+
+    suspend fun getWatchers(): List<WatcherDto> =
+        decode(ListSerializer(WatcherDto.serializer()), execute(authorized("watcher").get().build()))
+
+    suspend fun addWatcher(request: WatcherRequest): WatcherDto {
+        val raw = execute(
+            authorized("watcher")
+                .post(json.encodeToString(WatcherRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(WatcherDto.serializer(), raw)
+    }
+
+    suspend fun deleteWatcher(id: String) {
+        execute(authorized("watcher/$id").delete().build())
+    }
+
+    suspend fun getHolidayStates(): List<HolidayStateDto> =
+        decode(ListSerializer(HolidayStateDto.serializer()), execute(authorized("holidays/states").get().build()))
+
+    suspend fun getHolidays(): HolidaysResponse =
+        decode(HolidaysResponse.serializer(), execute(authorized("holidays").get().build()))
+
+    suspend fun createHoliday(request: HolidayCreateRequest): HolidayDto {
+        val raw = execute(
+            authorized("holidays")
+                .post(json.encodeToString(HolidayCreateRequest.serializer(), request).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(HolidayDto.serializer(), raw)
+    }
+
+    suspend fun deleteHoliday(id: String) {
+        execute(authorized("holidays/$id").delete().build())
+    }
+
+    suspend fun getRoleUsers(): List<RoleUserDto> =
+        decode(ListSerializer(RoleUserDto.serializer()), execute(authorized("roles/users").get().build()))
+
+    suspend fun updateUserRole(id: String, role: Int): RoleUserDto {
+        val raw = execute(
+            authorized("roles/users/$id")
+                .put(json.encodeToString(RoleUpdateRequest.serializer(), RoleUpdateRequest(role)).toRequestBody(JsonMedia))
+                .build(),
+        )
+        return decode(RoleUserDto.serializer(), raw)
+    }
+
+    private fun authorized(path: String): Request.Builder {
+        val t = tokenStore.getToken() ?: throw ApiException("Nicht angemeldet", 401)
+        return Request.Builder()
+            .url(endpoint(path))
+            .header("Authorization", "Bearer $t")
+    }
+
+    private suspend fun execute(request: Request): String = withContext(Dispatchers.IO) {
+        client.newCall(request).execute().use { response ->
+            val raw = response.body?.string().orEmpty()
+            if (response.code == 401) {
+                tokenStore.clearToken()
+            }
+            if (!response.isSuccessful) {
+                val err = runCatching { json.decodeFromString(ErrorBody.serializer(), raw) }.getOrNull()
+                val msg = err?.error ?: err?.message ?: "HTTP ${response.code}"
+                throw ApiException(msg, response.code)
+            }
+            raw
+        }
+    }
+
+    private fun <T> decode(deserializer: KSerializer<T>, raw: String): T =
+        if (raw.isBlank()) json.decodeFromString(deserializer, "{}")
+        else json.decodeFromString(deserializer, raw)
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/TimeDtos.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/TimeDtos.kt
new file mode 100644
index 0000000..3116fe7
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/api/TimeDtos.kt
@@ -0,0 +1,101 @@
+package de.tsschulz.timeclock.data.api
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class CurrentStateResponse(
+    val success: Boolean = false,
+    val state: String? = null,
+    val error: String? = null,
+)
+
+@Serializable
+data class ClockRequest(
+    val action: String,
+)
+
+@Serializable
+data class ClockResponse(
+    val success: Boolean = false,
+    val message: String? = null,
+    val entry: RunningEntryDto? = null,
+    val error: String? = null,
+)
+
+@Serializable
+data class RunningEntryDto(
+    val id: String? = null,
+    val startTime: String? = null,
+    val currentPauseStart: String? = null,
+)
+
+@Serializable
+data class TimeStatsDto(
+    val totalEntries: Int? = null,
+    val completedEntries: Int? = null,
+    val runningEntries: Int? = null,
+    val totalHours: String? = null,
+    val timestamp: String? = null,
+    val currentlyWorked: String? = null,
+    val open: String? = null,
+    val requiredBreakMinutes: Int? = null,
+    val alreadyTakenBreakMinutes: Int? = null,
+    val missingBreakMinutes: Int? = null,
+    val regularEnd: String? = null,
+    val overtime: String? = null,
+    val totalOvertime: String? = null,
+    val weekWorktime: String? = null,
+    val nonWorkingHours: String? = null,
+    val openForWeek: String? = null,
+    val adjustedEndToday: String? = null,
+    val adjustedEndTodayGeneral: String? = null,
+    val adjustedEndTodayWeek: String? = null,
+)
+
+@Serializable
+data class TimeEntryDto(
+    val id: String,
+    val project: String? = null,
+    val description: String? = null,
+    val startTime: String? = null,
+    val endTime: String? = null,
+    val duration: Long? = null,
+    val isRunning: Boolean = false,
+    val userId: String? = null,
+)
+
+@Serializable
+data class WeekOverviewResponse(
+    val success: Boolean = false,
+    val data: WeekOverviewDto? = null,
+    val error: String? = null,
+)
+
+@Serializable
+data class WeekOverviewDto(
+    val weekStart: String? = null,
+    val weekEnd: String? = null,
+    val weekTotal: String? = null,
+    val totalAll: String? = null,
+    val days: List<WeekDayDto> = emptyList(),
+)
+
+@Serializable
+data class WeekDayDto(
+    val name: String? = null,
+    val date: String? = null,
+    val isToday: Boolean = false,
+    val workTime: String? = null,
+    val totalWorkTime: String? = null,
+    val netWorkTime: String? = null,
+    val status: String? = null,
+    val statusText: String? = null,
+    val workBlocks: List<WorkBlockDto> = emptyList(),
+)
+
+@Serializable
+data class WorkBlockDto(
+    val workTime: String? = null,
+    val totalWorkTime: String? = null,
+    val netWorkTime: String? = null,
+)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/auth/AuthRepository.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/auth/AuthRepository.kt
new file mode 100644
index 0000000..8692976
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/auth/AuthRepository.kt
@@ -0,0 +1,83 @@
+package de.tsschulz.timeclock.data.auth
+
+import de.tsschulz.timeclock.data.api.ApiException
+import de.tsschulz.timeclock.data.api.LoginRequest
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.api.UserDto
+import java.io.IOException
+
+data class UserProfile(
+    val id: Int,
+    val fullName: String,
+    val email: String?,
+    val role: Int,
+) {
+    val isAdmin: Boolean get() = role == 1
+}
+
+class AuthRepository(
+    private val api: TimeClockApiClient,
+    private val tokenStore: TokenStore,
+) {
+
+    fun hasStoredToken(): Boolean = tokenStore.getToken() != null
+
+    suspend fun restoreSession(): UserProfile? {
+        if (tokenStore.getToken() == null) return null
+        return try {
+            val me = api.getMe()
+            if (me.success && me.user != null) {
+                me.user!!.toProfile()
+            } else {
+                tokenStore.clearToken()
+                null
+            }
+        } catch (_: ApiException) {
+            null
+        } catch (_: IOException) {
+            null
+        } catch (_: Exception) {
+            null
+        }
+    }
+
+    suspend fun login(email: String, password: String, action: String = "0"): Result<UserProfile> {
+        return try {
+            val res = api.postLogin(
+                LoginRequest(
+                    email = email.trim(),
+                    password = password,
+                    action = action,
+                ),
+            )
+            if (res.success && !res.token.isNullOrBlank() && res.user != null) {
+                tokenStore.saveToken(res.token)
+                Result.success(res.user!!.toProfile())
+            } else {
+                Result.failure(Exception(res.error ?: "Login fehlgeschlagen"))
+            }
+        } catch (e: ApiException) {
+            Result.failure(Exception(e.message ?: "Login fehlgeschlagen"))
+        } catch (e: Exception) {
+            Result.failure(e)
+        }
+    }
+
+    suspend fun logout() {
+        try {
+            api.postLogout()
+        } catch (_: Exception) {
+            // Session serverseitig ungültig oder offline — lokal trotzdem leeren
+        } finally {
+            tokenStore.clearToken()
+        }
+    }
+
+    private fun UserDto.toProfile(): UserProfile =
+        UserProfile(
+            id = id,
+            fullName = fullName,
+            email = email,
+            role = role,
+        )
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/auth/TokenStore.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/auth/TokenStore.kt
new file mode 100644
index 0000000..89ecc8d
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/auth/TokenStore.kt
@@ -0,0 +1,38 @@
+package de.tsschulz.timeclock.data.auth
+
+import android.content.Context
+import androidx.security.crypto.EncryptedSharedPreferences
+import androidx.security.crypto.MasterKey
+
+class TokenStore(context: Context) {
+
+    private val appContext = context.applicationContext
+
+    private val prefs by lazy {
+        val masterKey = MasterKey.Builder(appContext)
+            .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
+            .build()
+        EncryptedSharedPreferences.create(
+            appContext,
+            PREFS_NAME,
+            masterKey,
+            EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
+            EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM,
+        )
+    }
+
+    fun getToken(): String? = prefs.getString(KEY_TOKEN, null)
+
+    fun saveToken(token: String) {
+        prefs.edit().putString(KEY_TOKEN, token).apply()
+    }
+
+    fun clearToken() {
+        prefs.edit().remove(KEY_TOKEN).apply()
+    }
+
+    private companion object {
+        const val PREFS_NAME = "timeclock_auth_prefs"
+        const val KEY_TOKEN = "jwt"
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/booking/BookingRepository.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/booking/BookingRepository.kt
new file mode 100644
index 0000000..61f9f9f
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/booking/BookingRepository.kt
@@ -0,0 +1,37 @@
+package de.tsschulz.timeclock.data.booking
+
+import de.tsschulz.timeclock.data.api.CalendarDto
+import de.tsschulz.timeclock.data.api.SickCreateRequest
+import de.tsschulz.timeclock.data.api.SickEntryDto
+import de.tsschulz.timeclock.data.api.SickTypeDto
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.api.TimefixCreateRequest
+import de.tsschulz.timeclock.data.api.TimefixDto
+import de.tsschulz.timeclock.data.api.VacationCreateRequest
+import de.tsschulz.timeclock.data.api.VacationDto
+import de.tsschulz.timeclock.data.api.WorkdaysDto
+import de.tsschulz.timeclock.data.api.WorklogEntryDto
+
+class BookingRepository(
+    private val api: TimeClockApiClient,
+) {
+    suspend fun getVacations(): List<VacationDto> = api.getVacations()
+    suspend fun createVacation(type: Int, start: String, end: String?) =
+        api.createVacation(VacationCreateRequest(type, start, end))
+    suspend fun deleteVacation(id: String) = api.deleteVacation(id)
+
+    suspend fun getSickEntries(): List<SickEntryDto> = api.getSickEntries()
+    suspend fun getSickTypes(): List<SickTypeDto> = api.getSickTypes()
+    suspend fun createSick(typeId: String, start: String, end: String?) =
+        api.createSick(SickCreateRequest(typeId, start, end ?: start))
+    suspend fun deleteSick(id: String) = api.deleteSick(id)
+
+    suspend fun getTimefixes(): List<TimefixDto> = api.getTimefixes()
+    suspend fun getWorklogEntries(date: String): List<WorklogEntryDto> = api.getWorklogEntries(date)
+    suspend fun createTimefix(worklogId: String, date: String, time: String, action: String) =
+        api.createTimefix(TimefixCreateRequest(worklogId, date, time, action))
+    suspend fun deleteTimefix(id: String) = api.deleteTimefix(id)
+
+    suspend fun getWorkdays(year: Int): WorkdaysDto = api.getWorkdays(year)
+    suspend fun getCalendar(year: Int, month: Int): CalendarDto = api.getCalendar(year, month)
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/offline/OfflineClockQueue.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/offline/OfflineClockQueue.kt
new file mode 100644
index 0000000..693ae9b
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/offline/OfflineClockQueue.kt
@@ -0,0 +1,51 @@
+package de.tsschulz.timeclock.data.offline
+
+import android.content.Context
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.Json
+import java.util.UUID
+
+@Serializable
+data class PendingClockAction(
+    val id: String,
+    val action: String,
+    val createdAtEpochMillis: Long,
+)
+
+class OfflineClockQueue(
+    context: Context,
+    private val json: Json = Json { ignoreUnknownKeys = true },
+) {
+    private val prefs = context.applicationContext.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+
+    fun enqueue(action: String) {
+        val next = pending() + PendingClockAction(
+            id = UUID.randomUUID().toString(),
+            action = action,
+            createdAtEpochMillis = System.currentTimeMillis(),
+        )
+        save(next)
+    }
+
+    fun pending(): List<PendingClockAction> {
+        val raw = prefs.getString(KEY_ACTIONS, null) ?: return emptyList()
+        return runCatching {
+            json.decodeFromString(ListSerializer(PendingClockAction.serializer()), raw)
+        }.getOrDefault(emptyList())
+    }
+
+    fun remove(id: String) {
+        save(pending().filterNot { it.id == id })
+    }
+
+    private fun save(actions: List<PendingClockAction>) {
+        val raw = json.encodeToString(ListSerializer(PendingClockAction.serializer()), actions)
+        prefs.edit().putString(KEY_ACTIONS, raw).apply()
+    }
+
+    private companion object {
+        const val PREFS_NAME = "timeclock_offline_clock_queue"
+        const val KEY_ACTIONS = "pending_clock_actions"
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/settings/SettingsRepository.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/settings/SettingsRepository.kt
new file mode 100644
index 0000000..07a254a
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/settings/SettingsRepository.kt
@@ -0,0 +1,37 @@
+package de.tsschulz.timeclock.data.settings
+
+import de.tsschulz.timeclock.data.api.InvitationDto
+import de.tsschulz.timeclock.data.api.InviteRequest
+import de.tsschulz.timeclock.data.api.PasswordChangeRequest
+import de.tsschulz.timeclock.data.api.ProfileDto
+import de.tsschulz.timeclock.data.api.ProfileUpdateRequest
+import de.tsschulz.timeclock.data.api.StateDto
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.api.TimewishCreateRequest
+import de.tsschulz.timeclock.data.api.TimewishDto
+import de.tsschulz.timeclock.data.api.WatcherDto
+import de.tsschulz.timeclock.data.api.WatcherRequest
+
+class SettingsRepository(
+    private val api: TimeClockApiClient,
+) {
+    suspend fun getProfile(): ProfileDto = api.getProfile()
+    suspend fun getStates(): List<StateDto> = api.getStates()
+    suspend fun updateProfile(fullName: String, stateId: String?, weekWorkdays: Int, dailyHours: Double, preferredTitleType: Int) =
+        api.updateProfile(ProfileUpdateRequest(fullName, stateId, weekWorkdays, dailyHours, preferredTitleType))
+
+    suspend fun changePassword(oldPassword: String, newPassword: String, confirmPassword: String) =
+        api.changePassword(PasswordChangeRequest(oldPassword, newPassword, confirmPassword))
+
+    suspend fun getTimewishes(): List<TimewishDto> = api.getTimewishes()
+    suspend fun createTimewish(day: Int, wishtype: Int, hours: Double?, startDate: String, endDate: String?) =
+        api.createTimewish(TimewishCreateRequest(day, wishtype, hours, startDate, endDate))
+    suspend fun deleteTimewish(id: String) = api.deleteTimewish(id)
+
+    suspend fun getInvites(): List<InvitationDto> = api.getInvites()
+    suspend fun sendInvite(email: String) = api.sendInvite(InviteRequest(email))
+
+    suspend fun getWatchers(): List<WatcherDto> = api.getWatchers()
+    suspend fun addWatcher(email: String) = api.addWatcher(WatcherRequest(email))
+    suspend fun deleteWatcher(id: String) = api.deleteWatcher(id)
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/time/TimeRepository.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/time/TimeRepository.kt
new file mode 100644
index 0000000..dba1268
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/data/time/TimeRepository.kt
@@ -0,0 +1,70 @@
+package de.tsschulz.timeclock.data.time
+
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.api.TimeEntryDto
+import de.tsschulz.timeclock.data.api.TimeStatsDto
+import de.tsschulz.timeclock.data.api.WeekOverviewDto
+import de.tsschulz.timeclock.data.offline.OfflineClockQueue
+import java.io.IOException
+
+class TimeRepository(
+    private val api: TimeClockApiClient,
+    private val offlineClockQueue: OfflineClockQueue? = null,
+) {
+    suspend fun loadDashboard(): TimeDashboard {
+        syncOfflineClockActions()
+        val state = api.getCurrentState().state
+        val running = api.getRunningEntry()
+        val stats = api.getTimeStats()
+        return TimeDashboard(
+            state = state,
+            runningStartTime = running.startTime,
+            currentPauseStart = running.currentPauseStart,
+            stats = stats,
+        )
+    }
+
+    suspend fun clock(action: String): TimeDashboard {
+        val response = try {
+            api.postClock(action)
+        } catch (e: IOException) {
+            offlineClockQueue?.enqueue(action)
+            throw IllegalStateException("Keine Verbindung. Die Stempelaktion wurde offline gespeichert und wird später synchronisiert.", e)
+        }
+        if (!response.success) {
+            throw IllegalStateException(response.error ?: "Stempeln fehlgeschlagen")
+        }
+        return loadDashboard()
+    }
+
+    suspend fun loadWeek(weekOffset: Int): WeekOverviewDto {
+        val response = api.getWeekOverview(weekOffset)
+        if (!response.success || response.data == null) {
+            throw IllegalStateException(response.error ?: "Wochenübersicht konnte nicht geladen werden")
+        }
+        return response.data
+    }
+
+    suspend fun loadEntries(): List<TimeEntryDto> = api.getTimeEntries()
+    suspend fun deleteEntry(id: String) = api.deleteTimeEntry(id)
+    suspend fun loadStats(): TimeStatsDto = api.getTimeStats()
+
+    private suspend fun syncOfflineClockActions() {
+        val queue = offlineClockQueue ?: return
+        queue.pending().forEach { pending ->
+            try {
+                val response = api.postClock(pending.action)
+                if (response.success) queue.remove(pending.id)
+            } catch (_: IOException) {
+                return
+            }
+        }
+    }
+}
+
+data class TimeDashboard(
+    val state: String?,
+    val runningStartTime: String?,
+    val currentPauseStart: String?,
+    val stats: TimeStatsDto,
+)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/TimeClockApp.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/TimeClockApp.kt
new file mode 100644
index 0000000..0fabf28
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/TimeClockApp.kt
@@ -0,0 +1,414 @@
+package de.tsschulz.timeclock.ui
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.data.api.WeekDayDto
+import de.tsschulz.timeclock.data.api.WeekOverviewDto
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import de.tsschulz.timeclock.ui.admin.AdminViewModel
+import de.tsschulz.timeclock.ui.admin.HolidaysAdminScreen
+import de.tsschulz.timeclock.ui.admin.RolesAdminScreen
+import de.tsschulz.timeclock.ui.auth.AuthViewModel
+import de.tsschulz.timeclock.ui.auth.LoginScreen
+import de.tsschulz.timeclock.ui.booking.BookingViewModel
+import de.tsschulz.timeclock.ui.booking.CalendarScreen
+import de.tsschulz.timeclock.ui.booking.SickScreen
+import de.tsschulz.timeclock.ui.booking.TimefixScreen
+import de.tsschulz.timeclock.ui.booking.VacationScreen
+import de.tsschulz.timeclock.ui.booking.WorkdaysScreen
+import de.tsschulz.timeclock.ui.components.TcButton
+import de.tsschulz.timeclock.ui.components.TcCard
+import de.tsschulz.timeclock.ui.components.TcError
+import de.tsschulz.timeclock.ui.components.TcLoading
+import de.tsschulz.timeclock.ui.components.TcScaffold
+import de.tsschulz.timeclock.ui.components.TcTextField
+import de.tsschulz.timeclock.ui.model.AppRoute
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.model.adminSections
+import de.tsschulz.timeclock.ui.model.userSections
+import de.tsschulz.timeclock.ui.settings.InviteScreen
+import de.tsschulz.timeclock.ui.settings.PasswordScreen
+import de.tsschulz.timeclock.ui.settings.PermissionsScreen
+import de.tsschulz.timeclock.ui.settings.ProfileScreen
+import de.tsschulz.timeclock.ui.settings.SettingsViewModel
+import de.tsschulz.timeclock.ui.settings.TimewishScreen
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+import de.tsschulz.timeclock.ui.time.EntriesScreen
+import de.tsschulz.timeclock.ui.time.StatsScreen
+import de.tsschulz.timeclock.ui.time.TimeViewModel
+import java.time.LocalDate
+import java.time.OffsetDateTime
+import java.time.format.DateTimeFormatter
+import java.util.Locale
+
+@Composable
+fun TimeClockApp(
+    authViewModel: AuthViewModel,
+    timeViewModel: TimeViewModel,
+    bookingViewModel: BookingViewModel,
+    settingsViewModel: SettingsViewModel,
+    adminViewModel: AdminViewModel,
+) {
+    val authState by authViewModel.uiState.collectAsStateWithLifecycle()
+    val timeState by timeViewModel.uiState.collectAsStateWithLifecycle()
+    val bookingState by bookingViewModel.uiState.collectAsStateWithLifecycle()
+    val settingsState by settingsViewModel.uiState.collectAsStateWithLifecycle()
+    val adminState by adminViewModel.uiState.collectAsStateWithLifecycle()
+
+    if (!authState.isAuthenticated) {
+        LaunchedEffect(Unit) { timeViewModel.stop() }
+        LoginScreen(
+            state = authState,
+            onLogin = { e, p, action -> authViewModel.login(e, p, action) },
+            onRetryBootstrap = { authViewModel.retryBootstrap() },
+        )
+        return
+    }
+
+    val user = authState.user
+    if (user == null) {
+        LoginScreen(
+            state = authState,
+            onLogin = { e, p, action -> authViewModel.login(e, p, action) },
+            onRetryBootstrap = { authViewModel.retryBootstrap() },
+        )
+        return
+    }
+
+    val sections = if (user.isAdmin) adminSections else userSections
+    LaunchedEffect(user.id) { timeViewModel.start() }
+    LaunchedEffect(user.id) { bookingViewModel.loadPhase4() }
+    LaunchedEffect(user.id) { settingsViewModel.loadPhase5() }
+    LaunchedEffect(user.id, user.isAdmin) { adminViewModel.loadPhase6(user.isAdmin) }
+
+    var selectedRoute by remember { mutableStateOf(AppRoute.Week) }
+
+    BoxWithConstraints(modifier = Modifier.background(TcColors.Background)) {
+        val isTablet = maxWidth >= 840.dp
+        TcScaffold(
+            title = selectedRoute.title,
+            userName = user.fullName,
+            sections = sections,
+            selectedRoute = selectedRoute,
+            isTablet = isTablet,
+            statusRows = timeState.statusRows,
+            primaryStatusAction = timeState.primaryAction,
+            secondaryStatusAction = timeState.secondaryAction,
+            onRouteSelected = { selectedRoute = it },
+            onLogout = {
+                timeViewModel.stop()
+                authViewModel.logout()
+            },
+            onStatusAction = { action ->
+                action.clockAction?.let { timeViewModel.clock(it) }
+            },
+        ) {
+            timeState.error?.let { TcError(it) }
+            DemoScreen(
+                route = selectedRoute,
+                isTablet = isTablet,
+                week = timeState.week,
+                weekLoading = timeState.weekLoading,
+                weekError = timeState.weekError,
+                weekOffset = timeState.weekOffset,
+                onWeekOffset = { timeViewModel.loadWeek(it) },
+                timeState = timeState,
+                timeViewModel = timeViewModel,
+                bookingState = bookingState,
+                bookingViewModel = bookingViewModel,
+                settingsState = settingsState,
+                settingsViewModel = settingsViewModel,
+                adminState = adminState,
+                adminViewModel = adminViewModel,
+            )
+        }
+    }
+}
+
+@Composable
+private fun DemoScreen(
+    route: AppRoute,
+    isTablet: Boolean,
+    week: WeekOverviewDto?,
+    weekLoading: Boolean,
+    weekError: String?,
+    weekOffset: Int,
+    onWeekOffset: (Int) -> Unit,
+    timeState: de.tsschulz.timeclock.ui.time.TimeUiState,
+    timeViewModel: TimeViewModel,
+    bookingState: de.tsschulz.timeclock.ui.booking.BookingUiState,
+    bookingViewModel: BookingViewModel,
+    settingsState: de.tsschulz.timeclock.ui.settings.SettingsUiState,
+    settingsViewModel: SettingsViewModel,
+    adminState: de.tsschulz.timeclock.ui.admin.AdminUiState,
+    adminViewModel: AdminViewModel,
+) {
+    when (route) {
+        AppRoute.Week -> WeekOverviewScreen(
+            week = week,
+            loading = weekLoading,
+            error = weekError,
+            weekOffset = weekOffset,
+            onWeekOffset = onWeekOffset,
+            isTablet = isTablet,
+        )
+        AppRoute.Timefix -> TimefixScreen(
+            state = bookingState,
+            isTablet = isTablet,
+            onDate = { bookingViewModel.setTimefixDate(it) },
+            onCreate = { id, date, time, action -> bookingViewModel.createTimefix(id, date, time, action) },
+            onDelete = { bookingViewModel.deleteTimefix(it) },
+        )
+        AppRoute.Vacation -> VacationScreen(
+            state = bookingState,
+            isTablet = isTablet,
+            onCreate = { type, start, end -> bookingViewModel.createVacation(type, start, end) },
+            onDelete = { bookingViewModel.deleteVacation(it) },
+        )
+        AppRoute.Sick -> SickScreen(
+            state = bookingState,
+            isTablet = isTablet,
+            onCreate = { type, start, end -> bookingViewModel.createSick(type, start, end) },
+            onDelete = { bookingViewModel.deleteSick(it) },
+        )
+        AppRoute.Workdays -> WorkdaysScreen(state = bookingState, onYear = { bookingViewModel.loadWorkdays(it) })
+        AppRoute.Calendar -> CalendarScreen(state = bookingState, onMonth = { bookingViewModel.changeCalendarMonth(it) })
+        AppRoute.Entries -> {
+            LaunchedEffect(Unit) { timeViewModel.loadEntries() }
+            EntriesScreen(
+                entries = timeState.entries,
+                loading = timeState.entriesLoading,
+                error = timeState.entriesError,
+                onRefresh = { timeViewModel.loadEntries() },
+                onDelete = { timeViewModel.deleteEntry(it) },
+            )
+        }
+        AppRoute.Stats -> {
+            LaunchedEffect(Unit) { timeViewModel.loadStats() }
+            StatsScreen(
+                stats = timeState.stats,
+                loading = timeState.statsLoading,
+                error = timeState.statsError,
+                onRefresh = { timeViewModel.loadStats() },
+            )
+        }
+        AppRoute.Export -> TcCard { Text("Export ist in der Android-App deaktiviert.", color = TcColors.TextMuted) }
+        AppRoute.Profile -> ProfileScreen(
+            state = settingsState,
+            isTablet = isTablet,
+            onSave = { name, stateId, weekWorkdays, dailyHours, titleType ->
+                settingsViewModel.updateProfile(name, stateId, weekWorkdays, dailyHours, titleType)
+            },
+        )
+        AppRoute.Password -> PasswordScreen(
+            state = settingsState,
+            onChange = { old, new, confirm -> settingsViewModel.changePassword(old, new, confirm) },
+        )
+        AppRoute.Timewish -> TimewishScreen(
+            state = settingsState,
+            isTablet = isTablet,
+            onCreate = { day, type, hours, start, end -> settingsViewModel.createTimewish(day, type, hours, start, end) },
+            onDelete = { settingsViewModel.deleteTimewish(it) },
+        )
+        AppRoute.Permissions -> PermissionsScreen(
+            state = settingsState,
+            isTablet = isTablet,
+            onAdd = { settingsViewModel.addWatcher(it) },
+            onDelete = { settingsViewModel.deleteWatcher(it) },
+        )
+        AppRoute.Invite -> InviteScreen(
+            state = settingsState,
+            isTablet = isTablet,
+            onSend = { settingsViewModel.sendInvite(it) },
+        )
+        AppRoute.Holidays -> HolidaysAdminScreen(
+            state = adminState,
+            isTablet = isTablet,
+            onCreate = { date, hours, description, stateIds -> adminViewModel.createHoliday(date, hours, description, stateIds) },
+            onDelete = { adminViewModel.deleteHoliday(it) },
+        )
+        AppRoute.Roles -> RolesAdminScreen(
+            state = adminState,
+            onUpdateRole = { id, role -> adminViewModel.updateUserRole(id, role) },
+        )
+    }
+}
+
+@Composable
+private fun WeekOverviewScreen(
+    week: WeekOverviewDto?,
+    loading: Boolean,
+    error: String?,
+    weekOffset: Int,
+    onWeekOffset: (Int) -> Unit,
+    isTablet: Boolean,
+) {
+    TcCard {
+        Row(horizontalArrangement = Arrangement.SpaceBetween, modifier = Modifier.fillMaxWidth()) {
+            TcButton("← Vorherige Woche", variant = ButtonVariant.Secondary, onClick = { onWeekOffset(weekOffset - 1) })
+            Text(
+                text = week?.rangeText() ?: "Wochenübersicht",
+                color = TcColors.Text,
+                fontSize = 18.sp,
+                fontWeight = FontWeight.SemiBold,
+            )
+            TcButton("Nächste Woche →", variant = ButtonVariant.Secondary, onClick = { onWeekOffset(weekOffset + 1) })
+        }
+    }
+
+    when {
+        loading -> TcLoading("Lade Wochenübersicht...")
+        error != null -> TcError(error)
+        week == null -> TcCard { Text("Keine Wochenübersicht vorhanden", color = TcColors.TextMuted) }
+        isTablet -> WeekTablet(week)
+        else -> WeekPhone(week)
+    }
+}
+
+@Composable
+private fun WeekTablet(week: WeekOverviewDto) {
+    Row(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Xl), modifier = Modifier.fillMaxWidth()) {
+        Column(modifier = Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(TcSpacing.Lg)) {
+            week.days.forEach { day -> WeekDayCard(day) }
+        }
+        TcCard(modifier = Modifier.weight(1f)) {
+            SectionTitle("Wochensumme")
+            DetailRow("Arbeitszeit", week.weekTotal ?: "0:00")
+            DetailRow("Gesamt", week.totalAll ?: week.weekTotal ?: "0:00")
+            val today = week.days.firstOrNull { it.isToday } ?: week.days.firstOrNull()
+            today?.let {
+                SectionTitle("Aktueller Tag")
+                DetailRow("Tag", it.name ?: "—")
+                DetailRow("Datum", it.date.toDisplayDate())
+                DetailRow("Status", it.statusText ?: "—")
+                DetailRow("Arbeitszeit", it.netWorkTime ?: it.totalWorkTime ?: "—")
+            }
+        }
+    }
+}
+
+@Composable
+private fun WeekPhone(week: WeekOverviewDto) {
+    week.days.forEach { day -> WeekDayCard(day) }
+    TcCard {
+        SectionTitle("Wochensumme")
+        DetailRow("Arbeitszeit", week.weekTotal ?: "0:00")
+        DetailRow("Gesamt", week.totalAll ?: week.weekTotal ?: "0:00")
+    }
+}
+
+@Composable
+private fun WeekDayCard(day: WeekDayDto) {
+    TcCard {
+        SectionTitle("${day.name ?: "Tag"} ${day.date.toDisplayDate()}")
+        val blocks = day.workBlocks
+        if (blocks.isNotEmpty()) {
+            blocks.forEachIndexed { index, block ->
+                val label = if (blocks.size > 1) "Arbeitszeit ${index + 1}" else "Arbeitszeit"
+                DetailRow(label, block.workTime ?: day.workTime ?: "—")
+                DetailRow("Netto", block.netWorkTime ?: block.totalWorkTime ?: "—")
+            }
+        } else {
+            DetailRow("Arbeitszeit", day.workTime ?: "—")
+            DetailRow("Netto", day.netWorkTime ?: day.totalWorkTime ?: "—")
+        }
+        DetailRow("Status", day.statusText ?: "—")
+    }
+}
+
+@Composable
+private fun CalendarDemo(isTablet: Boolean) {
+    if (isTablet) {
+        Row(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Xl), modifier = Modifier.fillMaxWidth()) {
+            ListDemo(title = "Kalender", modifier = Modifier.weight(1f))
+            TcCard(modifier = Modifier.weight(1f)) {
+                SectionTitle("Tagesdetails")
+                DetailRow("Datum", "14.05.2026")
+                DetailRow("Typ", "Arbeitstag")
+                DetailRow("Status", "Arbeit läuft")
+            }
+        }
+    } else {
+        ListDemo(title = "Kalender")
+    }
+}
+
+@Composable
+private fun FormDemo(title: String, primaryAction: String) {
+    var text by remember(title) { mutableStateOf("") }
+    TcCard {
+        SectionTitle(title)
+        TcTextField(label = "Bezeichnung", value = text, onValueChange = { text = it }, placeholder = "Eingabe")
+        Row(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Sm), modifier = Modifier.padding(top = TcSpacing.Lg)) {
+            TcButton(primaryAction, variant = ButtonVariant.Primary)
+            TcButton("Abbrechen")
+        }
+    }
+}
+
+@Composable
+private fun ListDemo(title: String, modifier: Modifier = Modifier) {
+    TcCard(modifier = modifier) {
+        SectionTitle(title)
+        DetailRow("Eintrag 1", "bereit")
+        DetailRow("Eintrag 2", "offen")
+        DetailRow("Eintrag 3", "geprüft")
+    }
+}
+
+@Composable
+private fun WeekCard(day: String, time: String, status: String) {
+    TcCard {
+        SectionTitle(day)
+        DetailRow("Zeit", time)
+        DetailRow("Status", status)
+    }
+}
+
+private fun WeekOverviewDto.rangeText(): String =
+    "${weekStart.toDisplayDate()} - ${weekEnd.toDisplayDate()}"
+
+private fun String?.toDisplayDate(): String {
+    if (this.isNullOrBlank()) return "—"
+    return runCatching {
+        LocalDate.parse(this.substring(0, 10)).format(DateTimeFormatter.ofPattern("dd.MM.yyyy", Locale.GERMANY))
+    }.recoverCatching {
+        OffsetDateTime.parse(this).toLocalDate().format(DateTimeFormatter.ofPattern("dd.MM.yyyy", Locale.GERMANY))
+    }.getOrDefault(this)
+}
+
+@Composable
+private fun SectionTitle(text: String) {
+    Text(
+        text = text,
+        color = TcColors.Text,
+        fontSize = 18.sp,
+        fontWeight = FontWeight.SemiBold,
+        modifier = Modifier.padding(bottom = TcSpacing.Md),
+    )
+}
+
+@Composable
+private fun DetailRow(label: String, value: String) {
+    Row(modifier = Modifier.fillMaxWidth().padding(vertical = 3.dp), horizontalArrangement = Arrangement.SpaceBetween) {
+        Text(text = "$label:", color = TcColors.TextMuted, fontSize = 14.sp)
+        Text(text = value, color = TcColors.Text, fontSize = 14.sp)
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/admin/AdminScreens.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/admin/AdminScreens.kt
new file mode 100644
index 0000000..8c82465
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/admin/AdminScreens.kt
@@ -0,0 +1,278 @@
+package de.tsschulz.timeclock.ui.admin
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.data.api.HolidayDto
+import de.tsschulz.timeclock.data.api.RoleUserDto
+import de.tsschulz.timeclock.ui.components.TcButton
+import de.tsschulz.timeclock.ui.components.TcCard
+import de.tsschulz.timeclock.ui.components.TcError
+import de.tsschulz.timeclock.ui.components.TcLoading
+import de.tsschulz.timeclock.ui.components.TcTextField
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+import java.time.LocalDate
+
+@Composable
+fun HolidaysAdminScreen(
+    state: AdminUiState,
+    isTablet: Boolean,
+    onCreate: (String, Double, String, List<String>) -> Unit,
+    onDelete: (String) -> Unit,
+) {
+    var date by rememberSaveable { mutableStateOf(LocalDate.now().toString()) }
+    var hours by rememberSaveable { mutableStateOf("8") }
+    var description by rememberSaveable { mutableStateOf("") }
+    var stateIds by rememberSaveable { mutableStateOf("") }
+
+    AdminFrame(state) {
+        if (isTablet) {
+            Row(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Xl), modifier = Modifier.fillMaxWidth()) {
+                HolidayForm(
+                    state = state,
+                    date = date,
+                    onDate = { date = it },
+                    hours = hours,
+                    onHours = { hours = it },
+                    description = description,
+                    onDescription = { description = it },
+                    stateIds = stateIds,
+                    onStateIds = { stateIds = it },
+                    onCreate = {
+                        onCreate(date, hours.toDoubleOrNull() ?: 8.0, description, parseStateIds(stateIds))
+                        description = ""
+                    },
+                    modifier = Modifier.weight(0.9f),
+                )
+                Column(modifier = Modifier.weight(1.1f), verticalArrangement = Arrangement.spacedBy(TcSpacing.Lg)) {
+                    HolidayList("Zukünftige Feiertage", state.futureHolidays, onDelete)
+                    HolidayList("Vergangene Feiertage", state.pastHolidays, onDelete)
+                }
+            }
+        } else {
+            HolidayForm(
+                state = state,
+                date = date,
+                onDate = { date = it },
+                hours = hours,
+                onHours = { hours = it },
+                description = description,
+                onDescription = { description = it },
+                stateIds = stateIds,
+                onStateIds = { stateIds = it },
+                onCreate = {
+                    onCreate(date, hours.toDoubleOrNull() ?: 8.0, description, parseStateIds(stateIds))
+                    description = ""
+                },
+            )
+            HolidayList("Zukünftige Feiertage", state.futureHolidays, onDelete)
+            HolidayList("Vergangene Feiertage", state.pastHolidays, onDelete)
+        }
+    }
+}
+
+@Composable
+fun RolesAdminScreen(
+    state: AdminUiState,
+    onUpdateRole: (String, Int) -> Unit,
+) {
+    AdminFrame(state) {
+        TcCard {
+            SectionTitle("Rechte")
+            Text(
+                text = "Als Administrator können Sie hier die Berechtigungen anderer Benutzer verwalten.",
+                color = TcColors.TextMuted,
+                fontSize = 14.sp,
+            )
+        }
+        ListCard("Benutzer", state.users) { user ->
+            UserRoleRow(user, onUpdateRole)
+        }
+    }
+}
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+private fun HolidayForm(
+    state: AdminUiState,
+    date: String,
+    onDate: (String) -> Unit,
+    hours: String,
+    onHours: (String) -> Unit,
+    description: String,
+    onDescription: (String) -> Unit,
+    stateIds: String,
+    onStateIds: (String) -> Unit,
+    onCreate: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    FormCard("Feiertag hinzufügen", modifier) {
+        TcTextField("Datum", date, onDate, placeholder = "YYYY-MM-DD")
+        TcTextField("Freie Stunden", hours, onHours, placeholder = "8")
+        TcTextField("Beschreibung", description, onDescription, placeholder = "z.B. Tag der Deutschen Einheit")
+        TcTextField(
+            label = "Bundesland-IDs",
+            value = stateIds,
+            onValueChange = onStateIds,
+            placeholder = "Leer lassen für Bundesfeiertag",
+        )
+        if (state.holidayStates.isNotEmpty()) {
+            Text("Bundesländer", color = TcColors.TextMuted, fontSize = 13.sp)
+            FlowRow(
+                horizontalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+                verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+            ) {
+                val selected = parseStateIds(stateIds).toSet()
+                state.holidayStates.forEach { item ->
+                    TcButton(
+                        text = item.name,
+                        variant = if (item.id in selected) ButtonVariant.Primary else ButtonVariant.Default,
+                        onClick = { onStateIds(toggleStateId(stateIds, item.id)) },
+                    )
+                }
+            }
+        }
+        TcButton("Feiertag hinzufügen", variant = ButtonVariant.Primary, onClick = {
+            if (date.isNotBlank() && description.isNotBlank()) onCreate()
+        })
+    }
+}
+
+@Composable
+private fun HolidayList(title: String, holidays: List<HolidayDto>, onDelete: (String) -> Unit) {
+    ListCard(title, holidays) { holiday -> HolidayRow(holiday, onDelete) }
+}
+
+@Composable
+private fun HolidayRow(holiday: HolidayDto, onDelete: (String) -> Unit) = DataRow(
+    title = holiday.description,
+    details = "${holiday.date.toDisplayDate()} - ${holiday.hours} h - ${
+        if (holiday.isFederal || holiday.states.isEmpty()) "Bundesfeiertag" else holiday.states.joinToString()
+    }",
+    action = "Löschen",
+    variant = ButtonVariant.Danger,
+    onAction = { onDelete(holiday.id) },
+)
+
+@Composable
+private fun UserRoleRow(user: RoleUserDto, onUpdateRole: (String, Int) -> Unit) {
+    val isAdmin = user.role == 1 || user.roleString == "admin"
+    DataRow(
+        title = user.fullName,
+        details = "${user.stateName ?: "-"} - ${if (isAdmin) "Administrator" else "Benutzer"}",
+        action = if (isAdmin) "Zu Benutzer" else "Zu Admin",
+        variant = if (isAdmin) ButtonVariant.Secondary else ButtonVariant.Primary,
+        onAction = { onUpdateRole(user.id, if (isAdmin) 0 else 1) },
+    )
+}
+
+@Composable
+private fun AdminFrame(state: AdminUiState, content: @Composable ColumnScope.() -> Unit) {
+    Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Lg)) {
+        if (state.loading) TcLoading("Lade Daten...")
+        state.error?.let { TcError(it) }
+        state.success?.let {
+            TcCard { Text(it, color = TcColors.Success, fontSize = 14.sp, fontWeight = FontWeight.Medium) }
+        }
+        content()
+    }
+}
+
+@Composable
+private fun FormCard(title: String, modifier: Modifier = Modifier, content: @Composable ColumnScope.() -> Unit) {
+    TcCard(modifier = modifier) {
+        SectionTitle(title)
+        Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Md), content = content)
+    }
+}
+
+@Composable
+private fun <T> ListCard(title: String, items: List<T>, row: @Composable (T) -> Unit) {
+    TcCard {
+        SectionTitle(title)
+        if (items.isEmpty()) {
+            Text("Keine Einträge vorhanden.", color = TcColors.TextMuted, fontSize = 14.sp)
+        } else {
+            Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm)) {
+                items.forEach { item -> row(item) }
+            }
+        }
+    }
+}
+
+@Composable
+private fun DataRow(
+    title: String,
+    details: String,
+    action: String,
+    variant: ButtonVariant,
+    onAction: () -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(TcColors.Background, RoundedCornerShape(TcRadius.Medium))
+            .border(1.dp, TcColors.Border, RoundedCornerShape(TcRadius.Medium))
+            .padding(TcSpacing.Md),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(TcSpacing.Md),
+    ) {
+        Column(modifier = Modifier.weight(1f)) {
+            Text(title, color = TcColors.Text, fontSize = 14.sp, fontWeight = FontWeight.SemiBold)
+            Text(details, color = TcColors.TextMuted, fontSize = 13.sp)
+        }
+        TcButton(action, variant = variant, onClick = onAction)
+    }
+}
+
+@Composable
+private fun SectionTitle(title: String) {
+    Text(
+        text = title,
+        color = TcColors.Text,
+        fontSize = 18.sp,
+        fontWeight = FontWeight.SemiBold,
+        modifier = Modifier.padding(bottom = TcSpacing.Sm),
+    )
+}
+
+private fun parseStateIds(raw: String): List<String> =
+    raw.split(',', ';', ' ')
+        .map { it.trim() }
+        .filter { it.isNotBlank() }
+
+private fun toggleStateId(raw: String, id: String): String {
+    val ids = parseStateIds(raw).toMutableList()
+    if (id in ids) ids.remove(id) else ids.add(id)
+    return ids.joinToString(",")
+}
+
+private fun String?.toDisplayDate(): String {
+    if (this.isNullOrBlank()) return "-"
+    return runCatching {
+        val p = LocalDate.parse(this)
+        "%02d.%02d.%04d".format(p.dayOfMonth, p.monthValue, p.year)
+    }.getOrDefault(this)
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/admin/AdminViewModel.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/admin/AdminViewModel.kt
new file mode 100644
index 0000000..f9cbe92
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/admin/AdminViewModel.kt
@@ -0,0 +1,95 @@
+package de.tsschulz.timeclock.ui.admin
+
+import android.app.Application
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import de.tsschulz.timeclock.data.admin.AdminRepository
+import de.tsschulz.timeclock.data.api.HolidayDto
+import de.tsschulz.timeclock.data.api.HolidayStateDto
+import de.tsschulz.timeclock.data.api.RoleUserDto
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.auth.TokenStore
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
+data class AdminUiState(
+    val loading: Boolean = false,
+    val error: String? = null,
+    val success: String? = null,
+    val holidayStates: List<HolidayStateDto> = emptyList(),
+    val futureHolidays: List<HolidayDto> = emptyList(),
+    val pastHolidays: List<HolidayDto> = emptyList(),
+    val users: List<RoleUserDto> = emptyList(),
+)
+
+class AdminViewModel(
+    private val repository: AdminRepository,
+) : ViewModel() {
+    private val _uiState = MutableStateFlow(AdminUiState())
+    val uiState: StateFlow<AdminUiState> = _uiState.asStateFlow()
+
+    fun loadPhase6(isAdmin: Boolean) {
+        if (!isAdmin) return
+        loadHolidays()
+        loadRoles()
+    }
+
+    fun loadHolidays() = launchLoad {
+        val holidays = repository.getHolidays()
+        copy(
+            holidayStates = repository.getHolidayStates(),
+            futureHolidays = holidays.future,
+            pastHolidays = holidays.past,
+        )
+    }
+
+    fun createHoliday(date: String, hours: Double, description: String, stateIds: List<String>) = launchMutation("Feiertag gespeichert") {
+        repository.createHoliday(date, hours, description, stateIds)
+        loadHolidays()
+    }
+
+    fun deleteHoliday(id: String) = launchMutation("Feiertag gelöscht") {
+        repository.deleteHoliday(id)
+        loadHolidays()
+    }
+
+    fun loadRoles() = launchLoad {
+        copy(users = repository.getRoleUsers())
+    }
+
+    fun updateUserRole(id: String, role: Int) = launchMutation("Rolle geändert") {
+        repository.updateUserRole(id, role)
+        loadRoles()
+    }
+
+    private fun launchLoad(reducer: suspend AdminUiState.() -> AdminUiState) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(loading = true, error = null, success = null) }
+            runCatching { _uiState.value.reducer() }
+                .onSuccess { next -> _uiState.value = next.copy(loading = false, error = null) }
+                .onFailure { e -> _uiState.update { it.copy(loading = false, error = e.message ?: "Daten konnten nicht geladen werden") } }
+        }
+    }
+
+    private fun launchMutation(successMessage: String, block: suspend () -> Unit) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(loading = true, error = null, success = null) }
+            runCatching { block() }
+                .onSuccess { _uiState.update { it.copy(success = successMessage) } }
+                .onFailure { e -> _uiState.update { it.copy(error = e.message ?: "Aktion fehlgeschlagen") } }
+            _uiState.update { it.copy(loading = false) }
+        }
+    }
+
+    class Factory(private val application: Application) : ViewModelProvider.Factory {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel> create(modelClass: Class<T>): T {
+            val tokenStore = TokenStore(application)
+            return AdminViewModel(AdminRepository(TimeClockApiClient(tokenStore))) as T
+        }
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/auth/AuthViewModel.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/auth/AuthViewModel.kt
new file mode 100644
index 0000000..3962771
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/auth/AuthViewModel.kt
@@ -0,0 +1,109 @@
+package de.tsschulz.timeclock.ui.auth
+
+import android.app.Application
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import de.tsschulz.timeclock.data.auth.AuthRepository
+import de.tsschulz.timeclock.data.auth.TokenStore
+import de.tsschulz.timeclock.data.auth.UserProfile
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
+data class AuthUiState(
+    val bootstrapping: Boolean = true,
+    val isAuthenticated: Boolean = false,
+    val user: UserProfile? = null,
+    val loginInProgress: Boolean = false,
+    val error: String? = null,
+    /** Gespeicherter Token, aber `/auth/me` ist fehlgeschlagen (z. B. offline). */
+    val bootstrapWarn: String? = null,
+)
+
+class AuthViewModel(
+    private val repository: AuthRepository,
+) : ViewModel() {
+
+    private val _uiState = MutableStateFlow(AuthUiState())
+    val uiState: StateFlow<AuthUiState> = _uiState.asStateFlow()
+
+    init {
+        viewModelScope.launch { runBootstrap() }
+    }
+
+    private suspend fun runBootstrap() {
+        val user = repository.restoreSession()
+        val warn = if (user == null && repository.hasStoredToken()) {
+            "Profil konnte nicht geladen werden. Bitte Netzwerk prüfen oder erneut versuchen."
+        } else {
+            null
+        }
+        _uiState.value = AuthUiState(
+            bootstrapping = false,
+            isAuthenticated = user != null,
+            user = user,
+            bootstrapWarn = warn,
+        )
+    }
+
+    fun login(email: String, password: String, action: String) {
+        if (email.isBlank() || password.isBlank()) {
+            _uiState.update { it.copy(error = "E-Mail und Passwort sind erforderlich") }
+            return
+        }
+        viewModelScope.launch {
+            _uiState.update { it.copy(loginInProgress = true, error = null) }
+            repository.login(email, password, action).fold(
+                onSuccess = { user ->
+                    _uiState.update {
+                        it.copy(
+                            loginInProgress = false,
+                            isAuthenticated = true,
+                            user = user,
+                            error = null,
+                            bootstrapWarn = null,
+                        )
+                    }
+                },
+                onFailure = { e ->
+                    _uiState.update {
+                        it.copy(
+                            loginInProgress = false,
+                            error = e.message ?: "Login fehlgeschlagen",
+                        )
+                    }
+                },
+            )
+        }
+    }
+
+    fun logout() {
+        viewModelScope.launch {
+            repository.logout()
+            _uiState.value = AuthUiState(bootstrapping = false)
+        }
+    }
+
+    fun retryBootstrap() {
+        viewModelScope.launch {
+            _uiState.update { it.copy(bootstrapping = true, bootstrapWarn = null) }
+            runBootstrap()
+        }
+    }
+
+    class Factory(
+        private val application: Application,
+    ) : ViewModelProvider.Factory {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel> create(modelClass: Class<T>): T {
+            val tokenStore = TokenStore(application)
+            val api = TimeClockApiClient(tokenStore)
+            val repo = AuthRepository(api, tokenStore)
+            return AuthViewModel(repo) as T
+        }
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/auth/LoginScreen.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/auth/LoginScreen.kt
new file mode 100644
index 0000000..da301a8
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/auth/LoginScreen.kt
@@ -0,0 +1,257 @@
+package de.tsschulz.timeclock.ui.auth
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxWithConstraints
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.defaultMinSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.ui.components.TcBrandTitle
+import de.tsschulz.timeclock.ui.components.TcButton
+import de.tsschulz.timeclock.ui.components.TcTextField
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+
+/**
+ * Layout und Farben an die Web-Loginseite angelehnt (`Login.vue`: `.auth-page`, Navbar, `.auth-form-container`).
+ */
+@Composable
+fun LoginScreen(
+    state: AuthUiState,
+    onLogin: (email: String, password: String, action: String) -> Unit,
+    onRetryBootstrap: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    var email by rememberSaveable { mutableStateOf("") }
+    var password by rememberSaveable { mutableStateOf("") }
+
+    BoxWithConstraints(
+        modifier = modifier
+            .fillMaxSize()
+            .background(TcColors.Background),
+    ) {
+        val useWideFormRows = maxWidth >= 560.dp
+        val formHorizontalPadding = if (maxWidth < 420.dp) 24.dp else 48.dp
+        val formVerticalPadding = if (maxWidth < 420.dp) 24.dp else 40.dp
+
+        Column(Modifier.fillMaxSize()) {
+            LoginTopBar()
+
+            Box(
+                modifier = Modifier
+                    .weight(1f)
+                    .fillMaxWidth()
+                    .padding(horizontal = TcSpacing.Xxl, vertical = TcSpacing.WebContainer),
+                contentAlignment = Alignment.Center,
+            ) {
+                Column(
+                    modifier = Modifier
+                        .widthIn(max = 900.dp)
+                        .fillMaxWidth()
+                        .verticalScroll(rememberScrollState()),
+                    horizontalAlignment = Alignment.CenterHorizontally,
+                ) {
+                    Column(
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .shadow(4.dp, RoundedCornerShape(TcRadius.AuthPanel), clip = false)
+                            .background(TcColors.FormSurface, RoundedCornerShape(TcRadius.AuthPanel))
+                            .border(BorderStroke(1.dp, TcColors.Border), RoundedCornerShape(TcRadius.AuthPanel)),
+                    ) {
+                        Box(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .background(
+                                    TcColors.FormHeaderBg,
+                                    RoundedCornerShape(topStart = TcRadius.AuthPanel, topEnd = TcRadius.AuthPanel),
+                                )
+                                .padding(vertical = 12.dp),
+                            contentAlignment = Alignment.Center,
+                        ) {
+                            Text(
+                                text = "Einloggen",
+                                color = TcColors.Text,
+                                fontSize = 25.6.sp,
+                                fontWeight = FontWeight.Medium,
+                                textAlign = TextAlign.Center,
+                            )
+                        }
+                        HorizontalDivider(color = TcColors.Border, thickness = 1.dp)
+
+                        Column(
+                            modifier = Modifier
+                                .fillMaxWidth()
+                                .padding(horizontal = formHorizontalPadding, vertical = formVerticalPadding),
+                            verticalArrangement = Arrangement.spacedBy(16.dp),
+                        ) {
+                            if (state.bootstrapping) {
+                                Text(
+                                    text = "Sitzung wird geprüft…",
+                                    color = TcColors.TextMuted,
+                                    fontSize = 14.sp,
+                                    modifier = Modifier.fillMaxWidth(),
+                                    textAlign = TextAlign.Center,
+                                )
+                            } else {
+                                state.bootstrapWarn?.let { msg ->
+                                    AuthErrorBanner(message = msg)
+                                    Row(
+                                        modifier = Modifier.fillMaxWidth(),
+                                        horizontalArrangement = Arrangement.Center,
+                                    ) {
+                                        TcButton(
+                                            text = "Erneut versuchen",
+                                            variant = ButtonVariant.Primary,
+                                            onClick = onRetryBootstrap,
+                                        )
+                                    }
+                                }
+
+                                state.error?.let { AuthErrorBanner(message = it) }
+
+                                AuthFormRow(
+                                    label = "E-Mail-Adresse",
+                                    horizontal = useWideFormRows,
+                                ) {
+                                    TcTextField(
+                                        label = "",
+                                        value = email,
+                                        onValueChange = { email = it },
+                                        placeholder = "Ihre E-Mail-Adresse eingeben",
+                                        showLabel = false,
+                                    )
+                                }
+                                AuthFormRow(
+                                    label = "Passwort",
+                                    horizontal = useWideFormRows,
+                                ) {
+                                    TcTextField(
+                                        label = "",
+                                        value = password,
+                                        onValueChange = { password = it },
+                                        placeholder = "Ihr Passwort eingeben",
+                                        isPassword = true,
+                                        showLabel = false,
+                                    )
+                                }
+
+                                Spacer(modifier = Modifier.height(8.dp))
+
+                                Row(
+                                    modifier = Modifier.fillMaxWidth(),
+                                    horizontalArrangement = Arrangement.Center,
+                                ) {
+                                    TcButton(
+                                        text = if (state.loginInProgress) "Wird eingeloggt…" else "Einloggen",
+                                        variant = ButtonVariant.Primary,
+                                        onClick = { onLogin(email, password, "0") },
+                                        modifier = Modifier.defaultMinSize(minWidth = 140.dp),
+                                        contentPadding = PaddingValues(horizontal = 24.dp, vertical = 10.dp),
+                                    )
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun LoginTopBar() {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .shadow(2.dp)
+            .background(TcColors.Navbar)
+            .border(BorderStroke(1.dp, TcColors.BorderSoft))
+            .padding(horizontal = TcSpacing.WebContainer, vertical = TcSpacing.Md),
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        TcBrandTitle()
+    }
+}
+
+@Composable
+private fun AuthErrorBanner(message: String) {
+    Text(
+        text = message,
+        color = TcColors.AuthErrorText,
+        fontSize = 14.sp,
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(TcColors.AuthErrorBg, RoundedCornerShape(TcRadius.Medium))
+            .border(BorderStroke(1.dp, TcColors.AuthErrorBorder), RoundedCornerShape(TcRadius.Medium))
+            .padding(12.dp),
+    )
+}
+
+@Composable
+private fun AuthFormRow(
+    label: String,
+    horizontal: Boolean,
+    content: @Composable () -> Unit,
+) {
+    if (horizontal) {
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(16.dp),
+        ) {
+            Text(
+                text = label,
+                color = Color333,
+                fontWeight = FontWeight.Medium,
+                fontSize = 14.sp,
+                modifier = Modifier.width(192.dp),
+            )
+            Box(modifier = Modifier.weight(1f)) {
+                content()
+            }
+        }
+    } else {
+        Column(modifier = Modifier.fillMaxWidth()) {
+            Text(
+                text = label,
+                color = Color333,
+                fontWeight = FontWeight.Medium,
+                fontSize = 14.sp,
+                modifier = Modifier.padding(bottom = TcSpacing.Sm),
+            )
+            content()
+        }
+    }
+}
+
+private val Color333 = androidx.compose.ui.graphics.Color(0xFF333333)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/booking/BookingScreens.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/booking/BookingScreens.kt
new file mode 100644
index 0000000..51049a8
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/booking/BookingScreens.kt
@@ -0,0 +1,300 @@
+package de.tsschulz.timeclock.ui.booking
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.data.api.CalendarDayDto
+import de.tsschulz.timeclock.data.api.CalendarDto
+import de.tsschulz.timeclock.data.api.SickEntryDto
+import de.tsschulz.timeclock.data.api.TimefixDto
+import de.tsschulz.timeclock.data.api.VacationDto
+import de.tsschulz.timeclock.data.api.WorkdaysDto
+import de.tsschulz.timeclock.data.api.WorklogEntryDto
+import de.tsschulz.timeclock.ui.components.TcButton
+import de.tsschulz.timeclock.ui.components.TcCard
+import de.tsschulz.timeclock.ui.components.TcError
+import de.tsschulz.timeclock.ui.components.TcLoading
+import de.tsschulz.timeclock.ui.components.TcTextField
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+import java.time.LocalDate
+import java.time.YearMonth
+import java.time.format.DateTimeFormatter
+import java.util.Locale
+
+@Composable
+fun VacationScreen(state: BookingUiState, isTablet: Boolean, onCreate: (Int, String, String?) -> Unit, onDelete: (String) -> Unit) {
+    var type by rememberSaveable { mutableStateOf("0") }
+    var start by rememberSaveable { mutableStateOf(LocalDate.now().toString()) }
+    var end by rememberSaveable { mutableStateOf(LocalDate.now().toString()) }
+    Phase4Frame(state) {
+        FormCard("Urlaub eintragen", isTablet) {
+            TcTextField("Umfang (0 Zeitraum, 1 Halber Tag)", type, { type = it }, placeholder = "0")
+            TcTextField("Urlaubsbeginn", start, { start = it }, placeholder = "YYYY-MM-DD")
+            TcTextField("Urlaubsende", end, { end = it }, placeholder = "YYYY-MM-DD")
+            TcButton("Urlaub eintragen", variant = ButtonVariant.Primary, onClick = {
+                val typeValue = type.toIntOrNull() ?: 0
+                onCreate(typeValue, start, if (typeValue == 1) start else end)
+            })
+        }
+        ListCard("Urlaubseinträge", state.vacations) { item ->
+            VacationRow(item, onDelete)
+        }
+    }
+}
+
+@Composable
+fun SickScreen(state: BookingUiState, isTablet: Boolean, onCreate: (String, String, String?) -> Unit, onDelete: (String) -> Unit) {
+    var start by rememberSaveable { mutableStateOf(LocalDate.now().toString()) }
+    var end by rememberSaveable { mutableStateOf(LocalDate.now().toString()) }
+    var typeId by rememberSaveable { mutableStateOf(state.sickTypes.firstOrNull()?.id?.toString().orEmpty()) }
+    Phase4Frame(state) {
+        FormCard("Erkrankung eintragen", isTablet) {
+            TcTextField("Erster Krankheitstag", start, { start = it }, placeholder = "YYYY-MM-DD")
+            TcTextField("Letzter Krankheitstag", end, { end = it }, placeholder = "YYYY-MM-DD")
+            TcTextField("Krankheitstyp-ID", typeId, { typeId = it }, placeholder = state.sickTypes.joinToString { "${it.id}=${it.name}" })
+            TcButton("Erkrankung eintragen", variant = ButtonVariant.Primary, onClick = {
+                if (typeId.isNotBlank()) onCreate(typeId, start, end.ifBlank { start })
+            })
+        }
+        ListCard("Krankheitseinträge", state.sickEntries) { item ->
+            SickRow(item, onDelete)
+        }
+    }
+}
+
+@Composable
+fun TimefixScreen(
+    state: BookingUiState,
+    isTablet: Boolean,
+    onDate: (String) -> Unit,
+    onCreate: (String, String, String, String) -> Unit,
+    onDelete: (String) -> Unit,
+) {
+    var worklogId by rememberSaveable { mutableStateOf("") }
+    var time by rememberSaveable { mutableStateOf("08:00") }
+    var action by rememberSaveable { mutableStateOf("start work") }
+    Phase4Frame(state) {
+        FormCard("Zeitkorrektur", isTablet) {
+            TcTextField("Datum", state.timefixDate, onDate, placeholder = "YYYY-MM-DD")
+            TcTextField("Worklog-ID", worklogId, { worklogId = it }, placeholder = state.worklogEntries.firstOrNull()?.id?.toString() ?: "")
+            TcTextField("Neue Uhrzeit", time, { time = it }, placeholder = "HH:MM")
+            TcTextField("Aktion", action, { action = it }, placeholder = "start work")
+            TcButton("Korrektur erstellen", variant = ButtonVariant.Primary, onClick = {
+                if (worklogId.isNotBlank()) onCreate(worklogId, state.timefixDate, time, action)
+            })
+            if (state.worklogEntries.isEmpty()) {
+                Text("Für dieses Datum sind keine Worklog-Einträge vorhanden.", color = TcColors.TextMuted, fontSize = 13.sp)
+            }
+        }
+        ListCard("Worklog-Einträge am Datum", state.worklogEntries) { item -> WorklogRow(item) }
+        ListCard("Zeitkorrekturen heute", state.timefixes) { item -> TimefixRow(item, onDelete) }
+    }
+}
+
+@Composable
+fun WorkdaysScreen(state: BookingUiState, onYear: (Int) -> Unit) {
+    var year by rememberSaveable { mutableStateOf(state.workdaysYear.toString()) }
+    Phase4Frame(state) {
+        FormCard("Arbeitstage", isTablet = false) {
+            TcTextField("Jahr", year, { year = it }, placeholder = "2026")
+            TcButton("Jahr laden", variant = ButtonVariant.Primary, onClick = { year.toIntOrNull()?.let(onYear) })
+        }
+        WorkdaysCard(state.workdays)
+    }
+}
+
+@Composable
+fun CalendarScreen(state: BookingUiState, onMonth: (Int) -> Unit) {
+    Phase4Frame(state) {
+        TcCard {
+            Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween, verticalAlignment = Alignment.CenterVertically) {
+                TcButton("←", variant = ButtonVariant.Secondary, onClick = { onMonth(-1) })
+                Text(
+                    text = YearMonth.of(state.calendarYear, state.calendarMonth)
+                        .format(DateTimeFormatter.ofPattern("MMMM yyyy", Locale.GERMANY)),
+                    color = TcColors.Text,
+                    fontSize = 18.sp,
+                    fontWeight = FontWeight.SemiBold,
+                )
+                TcButton("→", variant = ButtonVariant.Secondary, onClick = { onMonth(1) })
+            }
+        }
+        CalendarGrid(state.calendar)
+    }
+}
+
+@Composable
+private fun Phase4Frame(state: BookingUiState, content: @Composable () -> Unit) {
+    if (state.loading) TcLoading("Lade Daten...")
+    state.error?.let { TcError(it) }
+    content()
+}
+
+@Composable
+private fun FormCard(title: String, isTablet: Boolean, content: @Composable ColumnScope.() -> Unit) {
+    TcCard {
+        SectionTitle(title)
+        Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Md), content = content)
+    }
+}
+
+@Composable
+private fun <T> ListCard(title: String, items: List<T>, row: @Composable (T) -> Unit) {
+    TcCard {
+        SectionTitle(title)
+        if (items.isEmpty()) {
+            Text("Keine Einträge vorhanden.", color = TcColors.TextMuted, fontSize = 14.sp)
+        } else {
+            Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm)) {
+                items.forEach { item -> row(item) }
+            }
+        }
+    }
+}
+
+@Composable
+private fun VacationRow(item: VacationDto, onDelete: (String) -> Unit) = DataRow(
+    title = item.type ?: "Urlaub",
+    details = "${item.startDate.toDisplayDate()} - ${item.endDate.toDisplayDate()}",
+    onDelete = { onDelete(item.id) },
+)
+
+@Composable
+private fun SickRow(item: SickEntryDto, onDelete: (String) -> Unit) = DataRow(
+    title = item.sickTypeName ?: "Krankheit",
+    details = "${item.startDate.toDisplayDate()} - ${item.endDate.toDisplayDate()}",
+    onDelete = { onDelete(item.id) },
+)
+
+@Composable
+private fun TimefixRow(item: TimefixDto, onDelete: (String) -> Unit) = DataRow(
+    title = item.newAction ?: "Zeitkorrektur",
+    details = "${item.originalDate.toDisplayDate()} ${item.originalTime ?: "—"} → ${item.newDate.toDisplayDate()} ${item.newTime ?: "—"}",
+    onDelete = { onDelete(item.id) },
+)
+
+@Composable
+private fun WorklogRow(item: WorklogEntryDto) = DataRow(
+    title = "#${item.id} ${item.action ?: "—"}",
+    details = "${item.time ?: "—"} (${item.tstamp ?: "—"})",
+)
+
+@Composable
+private fun DataRow(title: String, details: String, onDelete: (() -> Unit)? = null) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(TcColors.Background, RoundedCornerShape(TcRadius.Medium))
+            .border(1.dp, TcColors.Border, RoundedCornerShape(TcRadius.Medium))
+            .padding(TcSpacing.Md),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(TcSpacing.Md),
+    ) {
+        Column(modifier = Modifier.weight(1f)) {
+            Text(title, color = TcColors.Text, fontSize = 14.sp, fontWeight = FontWeight.SemiBold)
+            Text(details, color = TcColors.TextMuted, fontSize = 13.sp)
+        }
+        onDelete?.let { TcButton("Löschen", variant = ButtonVariant.Danger, onClick = it) }
+    }
+}
+
+@Composable
+private fun WorkdaysCard(data: WorkdaysDto?) {
+    TcCard {
+        SectionTitle("Jahresstatistik")
+        if (data == null) {
+            Text("Keine Statistik geladen.", color = TcColors.TextMuted)
+        } else {
+            Detail("Jahr", data.year.toString())
+            Detail("Werktage", data.workdays.toString())
+            Detail("Feiertage", data.holidays.toString())
+            Detail("Urlaubstage", data.vacationDays.toString())
+            Detail("Krankheitstage", "${data.sickDays} (${data.sickPercentage}%)")
+            Detail("Gearbeitete Tage", data.workedDays.toString())
+        }
+    }
+}
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+private fun CalendarGrid(data: CalendarDto?) {
+    TcCard {
+        SectionTitle("Kalender")
+        if (data == null) {
+            Text("Kein Kalender geladen.", color = TcColors.TextMuted)
+        } else {
+            Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm)) {
+                data.weeks.forEach { week ->
+                    FlowRow(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Sm), verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm)) {
+                        week.forEach { CalendarCell(it) }
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun CalendarCell(day: CalendarDayDto) {
+    val bg = when {
+        day.isToday -> TcColors.ActiveMenu
+        !day.isCurrentMonth -> TcColors.Card
+        else -> TcColors.Background
+    }
+    Column(
+        modifier = Modifier
+            .width(92.dp)
+            .background(bg, RoundedCornerShape(TcRadius.Medium))
+            .border(1.dp, TcColors.Border, RoundedCornerShape(TcRadius.Medium))
+            .padding(TcSpacing.Sm),
+    ) {
+        Text(day.day.toString(), color = TcColors.Text, fontWeight = FontWeight.SemiBold)
+        day.holiday?.let { Text(it, color = TcColors.Danger, fontSize = 11.sp) }
+        if (day.sick) Text("Krank", color = TcColors.Secondary, fontSize = 11.sp)
+        day.vacation?.let { Text(if (it == "half") "Urlaub 1/2" else "Urlaub", color = TcColors.Primary, fontSize = 11.sp) }
+        day.workedHours?.let { Text("${it}h", color = TcColors.TextMuted, fontSize = 11.sp) }
+    }
+}
+
+@Composable
+private fun SectionTitle(text: String) {
+    Text(text, color = TcColors.Text, fontSize = 18.sp, fontWeight = FontWeight.SemiBold, modifier = Modifier.padding(bottom = TcSpacing.Md))
+}
+
+@Composable
+private fun Detail(label: String, value: String) {
+    Row(modifier = Modifier.fillMaxWidth().padding(vertical = 3.dp), horizontalArrangement = Arrangement.SpaceBetween) {
+        Text("$label:", color = TcColors.TextMuted, fontSize = 14.sp)
+        Text(value, color = TcColors.Text, fontSize = 14.sp)
+    }
+}
+
+private fun String?.toDisplayDate(): String {
+    if (this.isNullOrBlank()) return "—"
+    return runCatching {
+        LocalDate.parse(this.substring(0, 10)).format(DateTimeFormatter.ofPattern("dd.MM.yyyy", Locale.GERMANY))
+    }.getOrDefault(this)
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/booking/BookingViewModel.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/booking/BookingViewModel.kt
new file mode 100644
index 0000000..27d24fa
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/booking/BookingViewModel.kt
@@ -0,0 +1,132 @@
+package de.tsschulz.timeclock.ui.booking
+
+import android.app.Application
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import de.tsschulz.timeclock.data.api.CalendarDto
+import de.tsschulz.timeclock.data.api.SickEntryDto
+import de.tsschulz.timeclock.data.api.SickTypeDto
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.api.TimefixDto
+import de.tsschulz.timeclock.data.api.VacationDto
+import de.tsschulz.timeclock.data.api.WorkdaysDto
+import de.tsschulz.timeclock.data.api.WorklogEntryDto
+import de.tsschulz.timeclock.data.auth.TokenStore
+import de.tsschulz.timeclock.data.booking.BookingRepository
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import java.time.LocalDate
+import java.time.YearMonth
+
+data class BookingUiState(
+    val loading: Boolean = false,
+    val error: String? = null,
+    val vacations: List<VacationDto> = emptyList(),
+    val sickEntries: List<SickEntryDto> = emptyList(),
+    val sickTypes: List<SickTypeDto> = emptyList(),
+    val timefixes: List<TimefixDto> = emptyList(),
+    val worklogEntries: List<WorklogEntryDto> = emptyList(),
+    val timefixDate: String = LocalDate.now().toString(),
+    val workdaysYear: Int = LocalDate.now().year,
+    val workdays: WorkdaysDto? = null,
+    val calendarYear: Int = LocalDate.now().year,
+    val calendarMonth: Int = LocalDate.now().monthValue,
+    val calendar: CalendarDto? = null,
+)
+
+class BookingViewModel(
+    private val repository: BookingRepository,
+) : ViewModel() {
+    private val _uiState = MutableStateFlow(BookingUiState())
+    val uiState: StateFlow<BookingUiState> = _uiState.asStateFlow()
+
+    fun loadPhase4() {
+        loadVacations()
+        loadSick()
+        loadTimefix()
+        loadWorkdays(_uiState.value.workdaysYear)
+        loadCalendar(_uiState.value.calendarYear, _uiState.value.calendarMonth)
+    }
+
+    fun loadVacations() = launchLoad { copy(vacations = repository.getVacations()) }
+    fun createVacation(type: Int, start: String, end: String?) = launchMutation {
+        repository.createVacation(type, start, end)
+        loadVacations()
+    }
+    fun deleteVacation(id: String) = launchMutation {
+        repository.deleteVacation(id)
+        loadVacations()
+    }
+
+    fun loadSick() = launchLoad {
+        copy(sickEntries = repository.getSickEntries(), sickTypes = repository.getSickTypes())
+    }
+    fun createSick(typeId: String, start: String, end: String?) = launchMutation {
+        repository.createSick(typeId, start, end)
+        loadSick()
+    }
+    fun deleteSick(id: String) = launchMutation {
+        repository.deleteSick(id)
+        loadSick()
+    }
+
+    fun setTimefixDate(date: String) {
+        _uiState.update { it.copy(timefixDate = date) }
+        loadTimefix(date)
+    }
+
+    fun loadTimefix(date: String = _uiState.value.timefixDate) = launchLoad {
+        copy(timefixes = repository.getTimefixes(), worklogEntries = repository.getWorklogEntries(date))
+    }
+    fun createTimefix(worklogId: String, date: String, time: String, action: String) = launchMutation {
+        repository.createTimefix(worklogId, date, time, action)
+        loadTimefix(date)
+    }
+    fun deleteTimefix(id: String) = launchMutation {
+        repository.deleteTimefix(id)
+        loadTimefix()
+    }
+
+    fun loadWorkdays(year: Int) = launchLoad {
+        copy(workdaysYear = year, workdays = repository.getWorkdays(year))
+    }
+
+    fun changeCalendarMonth(delta: Int) {
+        val current = YearMonth.of(_uiState.value.calendarYear, _uiState.value.calendarMonth).plusMonths(delta.toLong())
+        loadCalendar(current.year, current.monthValue)
+    }
+
+    fun loadCalendar(year: Int, month: Int) = launchLoad {
+        copy(calendarYear = year, calendarMonth = month, calendar = repository.getCalendar(year, month))
+    }
+
+    private fun launchLoad(reducer: suspend BookingUiState.() -> BookingUiState) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(loading = true, error = null) }
+            runCatching { _uiState.value.reducer() }
+                .onSuccess { next -> _uiState.value = next.copy(loading = false, error = null) }
+                .onFailure { e -> _uiState.update { it.copy(loading = false, error = e.message ?: "Daten konnten nicht geladen werden") } }
+        }
+    }
+
+    private fun launchMutation(block: suspend () -> Unit) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(loading = true, error = null) }
+            runCatching { block() }
+                .onFailure { e -> _uiState.update { it.copy(error = e.message ?: "Aktion fehlgeschlagen") } }
+            _uiState.update { it.copy(loading = false) }
+        }
+    }
+
+    class Factory(private val application: Application) : ViewModelProvider.Factory {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel> create(modelClass: Class<T>): T {
+            val tokenStore = TokenStore(application)
+            return BookingViewModel(BookingRepository(TimeClockApiClient(tokenStore))) as T
+        }
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcBrandTitle.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcBrandTitle.kt
new file mode 100644
index 0000000..7413692
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcBrandTitle.kt
@@ -0,0 +1,40 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.R
+import de.tsschulz.timeclock.ui.theme.TcColors
+
+/** App-Logo + „Stechuhr“ wie in der Web-Navbar. */
+@Composable
+fun TcBrandTitle(modifier: Modifier = Modifier) {
+    Row(
+        modifier = modifier,
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(10.dp),
+    ) {
+        Image(
+            painter = painterResource(R.drawable.ic_stechuhr_logo),
+            contentDescription = null,
+            modifier = Modifier.size(32.dp),
+            contentScale = ContentScale.Fit,
+        )
+        Text(
+            text = "Stechuhr",
+            color = TcColors.Text,
+            fontSize = 24.sp,
+            fontWeight = FontWeight.Bold,
+        )
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcButton.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcButton.kt
new file mode 100644
index 0000000..3e07a95
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcButton.kt
@@ -0,0 +1,64 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.defaultMinSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+
+@Composable
+fun TcButton(
+    text: String,
+    modifier: Modifier = Modifier,
+    variant: ButtonVariant = ButtonVariant.Default,
+    contentPadding: PaddingValues = PaddingValues(horizontal = 16.dp, vertical = 8.dp),
+    onClick: () -> Unit = {},
+) {
+    val style = buttonStyle(variant)
+    Box(
+        modifier = modifier
+            .defaultMinSize(minHeight = 36.dp)
+            .background(style.background, RoundedCornerShape(TcRadius.Medium))
+            .border(BorderStroke(1.dp, style.border), RoundedCornerShape(TcRadius.Medium))
+            .clickable(onClick = onClick)
+            .padding(contentPadding),
+        contentAlignment = Alignment.Center,
+    ) {
+        Text(
+            text = text,
+            color = style.text,
+            fontSize = 14.sp,
+            fontWeight = FontWeight.Normal,
+        )
+    }
+}
+
+private data class TcButtonStyle(
+    val background: Color,
+    val border: Color,
+    val text: Color,
+)
+
+private fun buttonStyle(variant: ButtonVariant): TcButtonStyle =
+    when (variant) {
+        ButtonVariant.Default -> TcButtonStyle(TcColors.Button, TcColors.ButtonBorder, Color(0xFF333333))
+        ButtonVariant.Primary -> TcButtonStyle(TcColors.Primary, TcColors.PrimaryBorder, Color.White)
+        ButtonVariant.Success -> TcButtonStyle(TcColors.Success, TcColors.SuccessBorder, Color.White)
+        ButtonVariant.Danger -> TcButtonStyle(TcColors.Danger, TcColors.DangerBorder, Color.White)
+        ButtonVariant.Secondary -> TcButtonStyle(TcColors.Secondary, TcColors.Secondary, Color.White)
+    }
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcCard.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcCard.kt
new file mode 100644
index 0000000..a14cf8a
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcCard.kt
@@ -0,0 +1,35 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.unit.dp
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+
+@Composable
+fun TcCard(
+    modifier: Modifier = Modifier,
+    contentPadding: PaddingValues = PaddingValues(TcSpacing.Xl),
+    content: @Composable ColumnScope.() -> Unit,
+) {
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .shadow(2.dp, RoundedCornerShape(TcRadius.Card), clip = false)
+            .background(TcColors.Card, RoundedCornerShape(TcRadius.Card))
+            .border(BorderStroke(1.dp, TcColors.Border), RoundedCornerShape(TcRadius.Card))
+            .padding(contentPadding),
+        content = content,
+    )
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcNavigation.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcNavigation.kt
new file mode 100644
index 0000000..09b8596
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcNavigation.kt
@@ -0,0 +1,285 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.EventNote
+import androidx.compose.material.icons.filled.AdminPanelSettings
+import androidx.compose.material.icons.filled.Assessment
+import androidx.compose.material.icons.filled.CalendarMonth
+import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material3.Icon
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.ui.model.AppRoute
+import de.tsschulz.timeclock.ui.model.MenuSection
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+
+@Composable
+fun TcSectionMenu(
+    sections: List<MenuSection>,
+    selectedRoute: AppRoute,
+    onRouteSelected: (AppRoute) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    Column(
+        modifier = modifier
+            .fillMaxHeight()
+            .width(230.dp)
+            .background(TcColors.Background)
+            .border(BorderStroke(1.dp, TcColors.Border))
+            .verticalScroll(rememberScrollState())
+            .padding(vertical = TcSpacing.Md),
+    ) {
+        sections.forEach { section ->
+            Text(
+                text = section.title,
+                color = TcColors.TextMuted,
+                fontSize = 14.sp,
+                fontWeight = FontWeight.Normal,
+                modifier = Modifier.padding(horizontal = TcSpacing.Lg, vertical = TcSpacing.Sm),
+            )
+            section.items.forEach { item ->
+                val selected = item.route == selectedRoute
+                Text(
+                    text = item.label,
+                    color = if (selected) TcColors.Text else Color333,
+                    fontSize = 14.sp,
+                    fontWeight = if (selected) FontWeight.SemiBold else FontWeight.Normal,
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .background(if (selected) TcColors.ActiveMenu else TcColors.Background)
+                        .clickable { onRouteSelected(item.route) }
+                        .padding(horizontal = TcSpacing.Xl, vertical = TcSpacing.Sm),
+                )
+            }
+        }
+    }
+}
+
+@Composable
+fun TcBottomNavigation(
+    sections: List<MenuSection>,
+    selectedRoute: AppRoute,
+    onRouteSelected: (AppRoute) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val items = sections.mapNotNull { section ->
+        val firstRoute = section.items.firstOrNull()?.route ?: return@mapNotNull null
+        BottomNavItem(section.title, firstRoute, section.icon())
+    }
+    var openSectionTitle by rememberSaveable { mutableStateOf<String?>(null) }
+
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .background(TcColors.Navbar)
+            .border(BorderStroke(1.dp, TcColors.BorderSoft))
+            .padding(horizontal = TcSpacing.Sm, vertical = TcSpacing.Xs),
+    ) {
+        val openSection = sections.firstOrNull { it.title == openSectionTitle }
+        openSection?.let { section ->
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .background(TcColors.Card, RoundedCornerShape(TcRadius.Medium))
+                    .border(BorderStroke(1.dp, TcColors.Border), RoundedCornerShape(TcRadius.Medium))
+                    .padding(vertical = TcSpacing.Sm),
+            ) {
+                section.items.forEach { menuItem ->
+                    val selected = menuItem.route == selectedRoute
+                    Text(
+                        text = menuItem.label,
+                        color = if (selected) TcColors.Text else Color333,
+                        fontSize = 15.sp,
+                        fontWeight = if (selected) FontWeight.SemiBold else FontWeight.Normal,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .background(if (selected) TcColors.ActiveMenu else TcColors.Card)
+                            .clickable {
+                                onRouteSelected(menuItem.route)
+                                openSectionTitle = null
+                            }
+                            .padding(horizontal = TcSpacing.Xl, vertical = TcSpacing.Md),
+                    )
+                }
+            }
+        }
+
+        Row(
+            modifier = Modifier.fillMaxWidth(),
+            horizontalArrangement = Arrangement.SpaceAround,
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            items.forEach { item ->
+                val selected = item.route == selectedRoute || isRouteInSection(item.route, selectedRoute)
+                val expanded = openSectionTitle == item.label
+                Column(
+                    modifier = Modifier
+                        .heightIn(min = 56.dp)
+                        .weight(1f)
+                        .background(if (selected || expanded) TcColors.ActiveMenu else TcColors.Navbar, RoundedCornerShape(TcRadius.Small))
+                        .clickable {
+                            openSectionTitle = if (expanded) null else item.label
+                        }
+                        .padding(vertical = TcSpacing.Sm),
+                    horizontalAlignment = Alignment.CenterHorizontally,
+                    verticalArrangement = Arrangement.Center,
+                ) {
+                    Icon(imageVector = item.icon, contentDescription = item.label, tint = TcColors.TextMuted)
+                    Text(text = item.label, color = TcColors.TextMuted, fontSize = 11.sp)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+fun TcMobileSubMenu(
+    sections: List<MenuSection>,
+    selectedRoute: AppRoute,
+    onRouteSelected: (AppRoute) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val section = sections.firstOrNull { s -> s.items.any { it.route == selectedRoute } } ?: return
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .background(TcColors.Card)
+            .border(BorderStroke(1.dp, TcColors.Border), RoundedCornerShape(TcRadius.Medium))
+            .padding(TcSpacing.Md),
+        verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+    ) {
+        Text(section.title, color = TcColors.TextMuted, fontSize = 13.sp, fontWeight = FontWeight.SemiBold)
+        section.items.forEach { item ->
+            val selected = item.route == selectedRoute
+            Text(
+                text = item.label,
+                color = if (selected) TcColors.Text else Color333,
+                fontSize = 14.sp,
+                fontWeight = if (selected) FontWeight.SemiBold else FontWeight.Normal,
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .background(if (selected) TcColors.ActiveMenu else TcColors.Card, RoundedCornerShape(TcRadius.Small))
+                    .clickable { onRouteSelected(item.route) }
+                    .padding(horizontal = TcSpacing.Md, vertical = TcSpacing.Sm),
+            )
+        }
+    }
+}
+
+@Composable
+fun TcMobileMainMenu(
+    sections: List<MenuSection>,
+    selectedRoute: AppRoute,
+    onRouteSelected: (AppRoute) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val selectedSectionTitle = sections.firstOrNull { section ->
+        section.items.any { it.route == selectedRoute }
+    }?.title
+    var openSectionTitle by rememberSaveable { mutableStateOf(selectedSectionTitle) }
+
+    LaunchedEffect(selectedSectionTitle) {
+        openSectionTitle = selectedSectionTitle
+    }
+
+    Column(
+        modifier = modifier
+            .fillMaxWidth()
+            .background(TcColors.Card)
+            .border(BorderStroke(1.dp, TcColors.Border), RoundedCornerShape(TcRadius.Medium))
+            .padding(vertical = TcSpacing.Sm),
+    ) {
+        sections.forEach { section ->
+            val open = openSectionTitle == section.title
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .clickable {
+                        openSectionTitle = if (open) null else section.title
+                    }
+                    .padding(horizontal = TcSpacing.Lg, vertical = TcSpacing.Md),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+            ) {
+                Text(
+                    text = section.title,
+                    color = TcColors.Text,
+                    fontSize = 15.sp,
+                    fontWeight = FontWeight.SemiBold,
+                    modifier = Modifier.weight(1f),
+                )
+                Text(if (open) "▾" else "▸", color = TcColors.TextMuted, fontSize = 14.sp)
+            }
+            if (open) {
+                section.items.forEach { item ->
+                    val selected = item.route == selectedRoute
+                    Text(
+                        text = item.label,
+                        color = if (selected) TcColors.Text else Color333,
+                        fontSize = 14.sp,
+                        fontWeight = if (selected) FontWeight.SemiBold else FontWeight.Normal,
+                        modifier = Modifier
+                            .fillMaxWidth()
+                            .background(if (selected) TcColors.ActiveMenu else TcColors.Card)
+                            .clickable { onRouteSelected(item.route) }
+                            .padding(horizontal = TcSpacing.Xl, vertical = TcSpacing.Sm),
+                    )
+                }
+            }
+        }
+    }
+}
+
+private data class BottomNavItem(
+    val label: String,
+    val route: AppRoute,
+    val icon: ImageVector,
+)
+
+private fun isRouteInSection(sectionRoute: AppRoute, selectedRoute: AppRoute): Boolean =
+    when (sectionRoute) {
+        AppRoute.Week -> selectedRoute in setOf(AppRoute.Timefix, AppRoute.Vacation, AppRoute.Sick, AppRoute.Workdays, AppRoute.Calendar)
+        AppRoute.Profile -> selectedRoute in setOf(AppRoute.Password, AppRoute.Timewish, AppRoute.Permissions, AppRoute.Invite)
+        AppRoute.Entries -> selectedRoute == AppRoute.Stats
+        AppRoute.Holidays -> selectedRoute == AppRoute.Roles
+        else -> false
+    }
+
+private fun MenuSection.icon(): ImageVector =
+    when (title) {
+        "Buchungen" -> Icons.AutoMirrored.Filled.EventNote
+        "Einstellungen" -> Icons.Filled.Settings
+        "Auswertung" -> Icons.Filled.Assessment
+        "Verwaltung" -> Icons.Filled.AdminPanelSettings
+        else -> Icons.Filled.CalendarMonth
+    }
+
+private val Color333 = androidx.compose.ui.graphics.Color(0xFF333333)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcScaffold.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcScaffold.kt
new file mode 100644
index 0000000..4f12e10
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcScaffold.kt
@@ -0,0 +1,185 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.ui.model.AppRoute
+import de.tsschulz.timeclock.ui.model.MenuSection
+import de.tsschulz.timeclock.ui.model.StatusAction
+import de.tsschulz.timeclock.ui.model.StatusRow
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+
+@Composable
+fun TcScaffold(
+    title: String,
+    userName: String,
+    sections: List<MenuSection>,
+    selectedRoute: AppRoute,
+    isTablet: Boolean,
+    statusRows: List<StatusRow>,
+    primaryStatusAction: StatusAction?,
+    secondaryStatusAction: StatusAction?,
+    onRouteSelected: (AppRoute) -> Unit,
+    onLogout: () -> Unit,
+    onStatusAction: (StatusAction) -> Unit = {},
+    content: @Composable ColumnScope.() -> Unit,
+) {
+    if (isTablet) {
+        Row(modifier = Modifier.fillMaxSize().background(TcColors.Background)) {
+            TcSectionMenu(
+                sections = sections,
+                selectedRoute = selectedRoute,
+                onRouteSelected = onRouteSelected,
+            )
+            Column(modifier = Modifier.fillMaxSize()) {
+                TcTopBar(title = title, userName = userName, compact = false, onLogout = onLogout)
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = TcSpacing.WebContainer, vertical = TcSpacing.Lg),
+                    horizontalArrangement = Arrangement.End,
+                ) {
+                    TcStatusBox(
+                        rows = statusRows,
+                        primaryAction = primaryStatusAction,
+                        secondaryAction = secondaryStatusAction,
+                        modifier = Modifier.fillMaxWidth(0.48f),
+                        onAction = onStatusAction,
+                    )
+                }
+                Column(
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .verticalScroll(rememberScrollState())
+                        .padding(horizontal = TcSpacing.WebContainer)
+                        .padding(bottom = TcSpacing.Xxl),
+                    verticalArrangement = Arrangement.spacedBy(TcSpacing.Xl),
+                    content = content,
+                )
+            }
+        }
+    } else {
+        Column(modifier = Modifier.fillMaxSize().background(TcColors.Background)) {
+            TcTopBar(title = title, userName = userName, compact = true, onLogout = onLogout)
+            Column(
+                modifier = Modifier
+                    .weight(1f)
+                    .verticalScroll(rememberScrollState())
+                    .padding(horizontal = TcSpacing.Lg, vertical = TcSpacing.Lg),
+                verticalArrangement = Arrangement.spacedBy(TcSpacing.Lg),
+            ) {
+                TcStatusBox(
+                    rows = statusRows,
+                    primaryAction = primaryStatusAction,
+                    secondaryAction = secondaryStatusAction,
+                    modifier = Modifier.fillMaxWidth(),
+                    onAction = onStatusAction,
+                )
+                content()
+            }
+            TcBottomNavigation(
+                sections = sections,
+                selectedRoute = selectedRoute,
+                onRouteSelected = onRouteSelected,
+            )
+        }
+    }
+}
+
+@Composable
+fun TcTopBar(
+    title: String,
+    userName: String,
+    modifier: Modifier = Modifier,
+    compact: Boolean = false,
+    onLogout: () -> Unit = {},
+) {
+    val barModifier = modifier
+        .fillMaxWidth()
+        .shadow(2.dp)
+        .background(TcColors.Navbar)
+        .border(BorderStroke(1.dp, TcColors.BorderSoft))
+        .statusBarsPadding()
+        .padding(horizontal = TcSpacing.Xl, vertical = TcSpacing.Md)
+
+    if (compact) {
+        Column(
+            modifier = barModifier,
+            verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+        ) {
+            Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(TcSpacing.Lg)) {
+                TcBrandTitle()
+                Box(modifier = Modifier.weight(1f))
+                TcButton(text = "Abmelden", onClick = onLogout)
+            }
+            Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(TcSpacing.Md)) {
+                PageTitle(title = title)
+                Text(
+                    text = userName,
+                    color = TcColors.TextMuted,
+                    fontSize = 14.sp,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis,
+                    modifier = Modifier.weight(1f),
+                )
+            }
+        }
+        return
+    }
+
+    Row(
+        modifier = barModifier,
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(TcSpacing.Lg),
+    ) {
+        TcBrandTitle()
+        PageTitle(title = title)
+        Box(modifier = Modifier.weight(1f))
+        Text(text = userName, color = TcColors.TextMuted, fontSize = 14.sp)
+        TcButton(text = "Abmelden", onClick = onLogout)
+    }
+}
+
+@Composable
+private fun PageTitle(title: String) {
+    Box(
+        modifier = Modifier
+            .background(TcColors.Background, RoundedCornerShape(TcRadius.Small))
+            .border(BorderStroke(1.dp, TcColors.Border), RoundedCornerShape(TcRadius.Small))
+            .padding(horizontal = 15.dp, vertical = 4.dp),
+    ) {
+        Text(
+            text = title,
+            color = Color2c3e50,
+            fontSize = 18.sp,
+            fontWeight = FontWeight.SemiBold,
+            maxLines = 1,
+            overflow = TextOverflow.Ellipsis,
+        )
+    }
+}
+
+private val Color2c3e50 = androidx.compose.ui.graphics.Color(0xFF2C3E50)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcStateViews.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcStateViews.kt
new file mode 100644
index 0000000..f6637a8
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcStateViews.kt
@@ -0,0 +1,41 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+
+@Composable
+fun TcLoading(text: String = "Lädt...") {
+    TcCard {
+        Text(text = text, color = TcColors.TextMuted, fontSize = 14.sp)
+    }
+}
+
+@Composable
+fun TcError(message: String) {
+    TcCard {
+        Text(text = "Fehler", color = TcColors.Danger, fontSize = 16.sp, fontWeight = FontWeight.SemiBold)
+        Text(text = message, color = TcColors.TextMuted, fontSize = 14.sp, modifier = Modifier.padding(top = TcSpacing.Sm))
+    }
+}
+
+@Composable
+fun TcEmptyState(title: String, message: String) {
+    Column(
+        modifier = Modifier.fillMaxWidth().padding(TcSpacing.Xl),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+    ) {
+        Text(text = title, color = TcColors.Text, fontSize = 18.sp, fontWeight = FontWeight.SemiBold)
+        Text(text = message, color = TcColors.TextMuted, fontSize = 14.sp)
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcStatusBox.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcStatusBox.kt
new file mode 100644
index 0000000..74e08fe
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcStatusBox.kt
@@ -0,0 +1,73 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.ui.model.StatusAction
+import de.tsschulz.timeclock.ui.model.StatusRow
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun TcStatusBox(
+    rows: List<StatusRow>,
+    primaryAction: StatusAction?,
+    secondaryAction: StatusAction?,
+    modifier: Modifier = Modifier,
+    onAction: (StatusAction) -> Unit = {},
+) {
+    Column(
+        modifier = modifier
+            .background(TcColors.Card, RoundedCornerShape(TcRadius.Card))
+            .border(BorderStroke(1.dp, TcColors.Border), RoundedCornerShape(TcRadius.Card))
+            .padding(TcSpacing.Md),
+        verticalArrangement = Arrangement.spacedBy(TcSpacing.Md),
+    ) {
+        FlowRow(
+            horizontalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+            verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm),
+        ) {
+            primaryAction?.let { action ->
+                TcButton(text = action.label, variant = action.variant, onClick = { onAction(action) })
+            }
+            secondaryAction?.let { action ->
+                TcButton(text = action.label, variant = action.variant, onClick = { onAction(action) })
+            }
+        }
+
+        Column(verticalArrangement = Arrangement.spacedBy(3.dp)) {
+            rows.forEach { row ->
+                if (row.isHeading) {
+                    Text(
+                        text = row.label,
+                        color = TcColors.Text,
+                        fontSize = 14.sp,
+                        fontWeight = FontWeight.SemiBold,
+                        modifier = Modifier.padding(top = TcSpacing.Xs),
+                    )
+                } else {
+                    Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween) {
+                        Text(text = "${row.label}:", color = TcColors.TextMuted, fontSize = 13.sp)
+                        Text(text = row.value ?: "-", color = TcColors.Text, fontSize = 13.sp)
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcTextField.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcTextField.kt
new file mode 100644
index 0000000..13ea25b
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/components/TcTextField.kt
@@ -0,0 +1,77 @@
+package de.tsschulz.timeclock.ui.components
+
+import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.BasicTextField
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.input.PasswordVisualTransformation
+import androidx.compose.ui.text.input.VisualTransformation
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.SolidColor
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+
+@Composable
+fun TcTextField(
+    label: String,
+    value: String,
+    onValueChange: (String) -> Unit,
+    modifier: Modifier = Modifier,
+    placeholder: String = "",
+    isPassword: Boolean = false,
+    showLabel: Boolean = true,
+) {
+    Column(modifier = modifier.fillMaxWidth()) {
+        if (showLabel) {
+            Text(
+                text = label,
+                color = Color333,
+                fontWeight = FontWeight.Medium,
+                fontSize = 14.sp,
+                modifier = Modifier.padding(bottom = TcSpacing.Sm),
+            )
+        }
+        BasicTextField(
+            value = value,
+            onValueChange = onValueChange,
+            textStyle = TextStyle(color = TcColors.Text, fontSize = 14.sp),
+            cursorBrush = SolidColor(TcColors.Primary),
+            singleLine = true,
+            visualTransformation = if (isPassword) PasswordVisualTransformation() else VisualTransformation.None,
+            keyboardOptions = KeyboardOptions(
+                keyboardType = if (isPassword) KeyboardType.Password else KeyboardType.Email,
+            ),
+            modifier = Modifier.fillMaxWidth(),
+            decorationBox = { innerTextField ->
+                Box(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .background(TcColors.Background, RoundedCornerShape(TcRadius.Medium))
+                        .border(BorderStroke(1.dp, TcColors.InputBorder), RoundedCornerShape(TcRadius.Medium))
+                        .padding(horizontal = 12.dp, vertical = 8.dp),
+                ) {
+                    if (value.isEmpty() && placeholder.isNotEmpty()) {
+                        Text(text = placeholder, color = TcColors.TextMuted, fontSize = 14.sp)
+                    }
+                    innerTextField()
+                }
+            },
+        )
+    }
+}
+
+private val Color333 = androidx.compose.ui.graphics.Color(0xFF333333)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/model/MockData.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/model/MockData.kt
new file mode 100644
index 0000000..2ae6c83
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/model/MockData.kt
@@ -0,0 +1,52 @@
+package de.tsschulz.timeclock.ui.model
+
+val userSections = listOf(
+    MenuSection(
+        title = "Buchungen",
+        items = listOf(
+            MenuItem("Wochenübersicht", AppRoute.Week),
+            MenuItem("Zeitkorrekturen", AppRoute.Timefix),
+            MenuItem("Urlaub", AppRoute.Vacation),
+            MenuItem("Krankheit", AppRoute.Sick),
+            MenuItem("Arbeitstage", AppRoute.Workdays),
+            MenuItem("Kalender", AppRoute.Calendar),
+        ),
+    ),
+    MenuSection(
+        title = "Einstellungen",
+        items = listOf(
+            MenuItem("Persönliches", AppRoute.Profile),
+            MenuItem("Passwort ändern", AppRoute.Password),
+            MenuItem("Zeitwünsche", AppRoute.Timewish),
+            MenuItem("Zugriffe verwalten", AppRoute.Permissions),
+            MenuItem("Einladen", AppRoute.Invite),
+        ),
+    ),
+    MenuSection(
+        title = "Auswertung",
+        items = listOf(
+            MenuItem("Einträge", AppRoute.Entries),
+            MenuItem("Statistiken", AppRoute.Stats),
+        ),
+    ),
+)
+
+val adminSections = userSections + MenuSection(
+    title = "Verwaltung",
+    items = listOf(
+        MenuItem("Feiertage", AppRoute.Holidays),
+        MenuItem("Rechte", AppRoute.Roles),
+    ),
+)
+
+val mockStatusRows = listOf(
+    StatusRow(label = "Heute", isHeading = true),
+    StatusRow(label = "Status", value = "Arbeit läuft"),
+    StatusRow(label = "Beginn", value = "08:12"),
+    StatusRow(label = "Arbeitszeit", value = "04:37:18"),
+    StatusRow(label = "Offen", value = "03:23"),
+    StatusRow(label = "Reguläres Ende", value = "16:42"),
+)
+
+val mockPrimaryAction = StatusAction("Pause starten", ButtonVariant.Success)
+val mockSecondaryAction = StatusAction("Gehen", ButtonVariant.Secondary)
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/model/UiModels.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/model/UiModels.kt
new file mode 100644
index 0000000..544bcb0
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/model/UiModels.kt
@@ -0,0 +1,50 @@
+package de.tsschulz.timeclock.ui.model
+
+data class MenuItem(
+    val label: String,
+    val route: AppRoute,
+)
+
+data class MenuSection(
+    val title: String,
+    val items: List<MenuItem>,
+)
+
+enum class AppRoute(val title: String) {
+    Week("Wochenübersicht"),
+    Timefix("Zeitkorrekturen"),
+    Vacation("Urlaub"),
+    Sick("Krankheit"),
+    Workdays("Arbeitstage"),
+    Calendar("Kalender"),
+    Entries("Einträge"),
+    Stats("Statistiken"),
+    Export("Export"),
+    Profile("Persönliches"),
+    Password("Passwort ändern"),
+    Timewish("Zeitwünsche"),
+    Permissions("Zugriffe verwalten"),
+    Invite("Einladen"),
+    Holidays("Feiertage"),
+    Roles("Rechte"),
+}
+
+data class StatusRow(
+    val label: String,
+    val value: String? = null,
+    val isHeading: Boolean = false,
+)
+
+data class StatusAction(
+    val label: String,
+    val variant: ButtonVariant,
+    val clockAction: String? = null,
+)
+
+enum class ButtonVariant {
+    Default,
+    Primary,
+    Success,
+    Danger,
+    Secondary,
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/settings/SettingsScreens.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/settings/SettingsScreens.kt
new file mode 100644
index 0000000..ece0235
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/settings/SettingsScreens.kt
@@ -0,0 +1,304 @@
+package de.tsschulz.timeclock.ui.settings
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.data.api.InvitationDto
+import de.tsschulz.timeclock.data.api.ProfileDto
+import de.tsschulz.timeclock.data.api.TimewishDto
+import de.tsschulz.timeclock.data.api.WatcherDto
+import de.tsschulz.timeclock.ui.components.TcButton
+import de.tsschulz.timeclock.ui.components.TcCard
+import de.tsschulz.timeclock.ui.components.TcError
+import de.tsschulz.timeclock.ui.components.TcLoading
+import de.tsschulz.timeclock.ui.components.TcTextField
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+import java.time.LocalDate
+
+@Composable
+fun ProfileScreen(
+    state: SettingsUiState,
+    isTablet: Boolean,
+    onSave: (String, String?, Int, Double, Int) -> Unit,
+) {
+    val profile = state.profile
+    var fullName by rememberSaveable { mutableStateOf("") }
+    var stateId by rememberSaveable { mutableStateOf("") }
+    var weekWorkdays by rememberSaveable { mutableStateOf("5") }
+    var dailyHours by rememberSaveable { mutableStateOf("8.0") }
+    var preferredTitleType by rememberSaveable { mutableStateOf("0") }
+
+    LaunchedEffect(profile) {
+        profile?.let {
+            fullName = it.fullName
+            stateId = it.stateId.orEmpty()
+            weekWorkdays = (it.weekWorkdays ?: 5).toString()
+            dailyHours = (it.dailyHours ?: 8.0).toString()
+            preferredTitleType = (it.preferredTitleType ?: 0).toString()
+        }
+    }
+
+    SettingsFrame(state) {
+        ResponsiveSettings(isTablet) {
+            FormCard("Persönliche Daten") {
+                TcTextField("Name", fullName, { fullName = it })
+                TcTextField("Bundesland-ID", stateId, { stateId = it }, placeholder = state.states.joinToString { "${it.id}=${it.name}" })
+                TcTextField("Arbeitstage pro Woche", weekWorkdays, { weekWorkdays = it }, placeholder = "5")
+                TcTextField("Stunden pro Tag", dailyHours, { dailyHours = it }, placeholder = "8.0")
+                TcTextField("Titeltyp", preferredTitleType, { preferredTitleType = it }, placeholder = "0")
+                TcButton("Speichern", variant = ButtonVariant.Primary, onClick = {
+                    onSave(
+                        fullName,
+                        stateId.ifBlank { null },
+                        weekWorkdays.toIntOrNull() ?: 5,
+                        dailyHours.toDoubleOrNull() ?: 8.0,
+                        preferredTitleType.toIntOrNull() ?: 0,
+                    )
+                })
+            }
+            ProfileDetails(profile)
+        }
+    }
+}
+
+@Composable
+fun PasswordScreen(
+    state: SettingsUiState,
+    onChange: (String, String, String) -> Unit,
+) {
+    var oldPassword by rememberSaveable { mutableStateOf("") }
+    var newPassword by rememberSaveable { mutableStateOf("") }
+    var confirmPassword by rememberSaveable { mutableStateOf("") }
+
+    SettingsFrame(state) {
+        FormCard("Passwort ändern") {
+            TcTextField("Aktuelles Passwort", oldPassword, { oldPassword = it }, isPassword = true)
+            TcTextField("Neues Passwort", newPassword, { newPassword = it }, isPassword = true)
+            TcTextField("Neues Passwort wiederholen", confirmPassword, { confirmPassword = it }, isPassword = true)
+            TcButton("Passwort ändern", variant = ButtonVariant.Primary, onClick = {
+                onChange(oldPassword, newPassword, confirmPassword)
+                oldPassword = ""
+                newPassword = ""
+                confirmPassword = ""
+            })
+        }
+    }
+}
+
+@Composable
+fun TimewishScreen(
+    state: SettingsUiState,
+    isTablet: Boolean,
+    onCreate: (Int, Int, Double?, String, String?) -> Unit,
+    onDelete: (String) -> Unit,
+) {
+    var day by rememberSaveable { mutableStateOf("1") }
+    var wishtype by rememberSaveable { mutableStateOf("1") }
+    var hours by rememberSaveable { mutableStateOf("8.0") }
+    var startDate by rememberSaveable { mutableStateOf(LocalDate.now().toString()) }
+    var endDate by rememberSaveable { mutableStateOf("") }
+
+    SettingsFrame(state) {
+        ResponsiveSettings(isTablet) {
+            FormCard("Zeitwunsch eintragen") {
+                TcTextField("Wochentag", day, { day = it }, placeholder = "1")
+                TcTextField("Wunschtyp", wishtype, { wishtype = it }, placeholder = "1")
+                TcTextField("Stunden", hours, { hours = it }, placeholder = "8.0")
+                TcTextField("Gueltig ab", startDate, { startDate = it }, placeholder = "YYYY-MM-DD")
+                TcTextField("Gueltig bis", endDate, { endDate = it }, placeholder = "YYYY-MM-DD")
+                TcButton("Zeitwunsch speichern", variant = ButtonVariant.Primary, onClick = {
+                    onCreate(
+                        day.toIntOrNull() ?: 1,
+                        wishtype.toIntOrNull() ?: 1,
+                        hours.toDoubleOrNull(),
+                        startDate,
+                        endDate.ifBlank { null },
+                    )
+                })
+            }
+            ListCard("Zeitwünsche", state.timewishes) { item -> TimewishRow(item, onDelete) }
+        }
+    }
+}
+
+@Composable
+fun InviteScreen(
+    state: SettingsUiState,
+    isTablet: Boolean,
+    onSend: (String) -> Unit,
+) {
+    var email by rememberSaveable { mutableStateOf("") }
+
+    SettingsFrame(state) {
+        ResponsiveSettings(isTablet) {
+            FormCard("Einladen") {
+                TcTextField("E-Mail", email, { email = it }, placeholder = "name@example.com")
+                TcButton("Einladung senden", variant = ButtonVariant.Primary, onClick = {
+                    if (email.isNotBlank()) {
+                        onSend(email)
+                        email = ""
+                    }
+                })
+            }
+            ListCard("Einladungen", state.invites) { item -> InviteRow(item) }
+        }
+    }
+}
+
+@Composable
+fun PermissionsScreen(
+    state: SettingsUiState,
+    isTablet: Boolean,
+    onAdd: (String) -> Unit,
+    onDelete: (String) -> Unit,
+) {
+    var email by rememberSaveable { mutableStateOf("") }
+
+    SettingsFrame(state) {
+        ResponsiveSettings(isTablet) {
+            FormCard("Zugriff hinzufügen") {
+                TcTextField("E-Mail", email, { email = it }, placeholder = "name@example.com")
+                TcButton("Zugriff speichern", variant = ButtonVariant.Primary, onClick = {
+                    if (email.isNotBlank()) {
+                        onAdd(email)
+                        email = ""
+                    }
+                })
+            }
+            ListCard("Aktuelle Zugriffe", state.watchers) { item -> WatcherRow(item, onDelete) }
+        }
+    }
+}
+
+@Composable
+private fun SettingsFrame(state: SettingsUiState, content: @Composable () -> Unit) {
+    if (state.loading) TcLoading("Lade Daten...")
+    state.error?.let { TcError(it) }
+    state.success?.let {
+        TcCard { Text(it, color = TcColors.Success, fontSize = 14.sp, fontWeight = FontWeight.Medium) }
+    }
+    content()
+}
+
+@Composable
+private fun ResponsiveSettings(isTablet: Boolean, content: @Composable ColumnScope.() -> Unit) {
+    if (isTablet) {
+        Row(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Xl), modifier = Modifier.fillMaxWidth()) {
+            Column(modifier = Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(TcSpacing.Lg), content = content)
+        }
+    } else {
+        Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Lg), content = content)
+    }
+}
+
+@Composable
+private fun FormCard(title: String, content: @Composable ColumnScope.() -> Unit) {
+    TcCard {
+        SectionTitle(title)
+        Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Md), content = content)
+    }
+}
+
+@Composable
+private fun <T> ListCard(title: String, items: List<T>, row: @Composable (T) -> Unit) {
+    TcCard {
+        SectionTitle(title)
+        if (items.isEmpty()) {
+            Text("Keine Einträge vorhanden.", color = TcColors.TextMuted, fontSize = 14.sp)
+        } else {
+            Column(verticalArrangement = Arrangement.spacedBy(TcSpacing.Sm)) {
+                items.forEach { item -> row(item) }
+            }
+        }
+    }
+}
+
+@Composable
+private fun ProfileDetails(profile: ProfileDto?) {
+    TcCard {
+        SectionTitle("Konto")
+        Detail("E-Mail", profile?.email ?: "-")
+        Detail("Bundesland", profile?.stateName ?: "-")
+        Detail("Wochenarbeitstage", profile?.weekWorkdays?.toString() ?: "-")
+        Detail("Tagesstunden", profile?.dailyHours?.toString() ?: "-")
+    }
+}
+
+@Composable
+private fun TimewishRow(item: TimewishDto, onDelete: (String) -> Unit) = DataRow(
+    title = item.dayName ?: "Tag ${item.day}",
+    details = "${item.wishtypeName ?: "Typ ${item.wishtype}"} - ${item.hours ?: 0.0} h - ${item.startDate ?: "-"} bis ${item.endDate ?: "-"}",
+    onDelete = { onDelete(item.id) },
+)
+
+@Composable
+private fun InviteRow(item: InvitationDto) = DataRow(
+    title = item.email,
+    details = "${item.status ?: "offen"} - gültig bis ${item.expiresAt ?: "-"}",
+)
+
+@Composable
+private fun WatcherRow(item: WatcherDto, onDelete: (String) -> Unit) = DataRow(
+    title = item.email,
+    details = "Seit ${item.createdAt ?: "-"}",
+    onDelete = { onDelete(item.id) },
+)
+
+@Composable
+private fun DataRow(title: String, details: String, onDelete: (() -> Unit)? = null) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(TcColors.Background, RoundedCornerShape(TcRadius.Medium))
+            .border(1.dp, TcColors.Border, RoundedCornerShape(TcRadius.Medium))
+            .padding(TcSpacing.Md),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(TcSpacing.Md),
+    ) {
+        Column(modifier = Modifier.weight(1f)) {
+            Text(title, color = TcColors.Text, fontSize = 14.sp, fontWeight = FontWeight.SemiBold)
+            Text(details, color = TcColors.TextMuted, fontSize = 13.sp)
+        }
+        onDelete?.let { TcButton("Löschen", variant = ButtonVariant.Danger, onClick = it) }
+    }
+}
+
+@Composable
+private fun SectionTitle(title: String) {
+    Text(
+        text = title,
+        color = TcColors.Text,
+        fontSize = 18.sp,
+        fontWeight = FontWeight.SemiBold,
+        modifier = Modifier.padding(bottom = TcSpacing.Sm),
+    )
+}
+
+@Composable
+private fun Detail(label: String, value: String) {
+    Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween) {
+        Text(label, color = TcColors.TextMuted, fontSize = 14.sp)
+        Text(value, color = TcColors.Text, fontSize = 14.sp, fontWeight = FontWeight.Medium)
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/settings/SettingsViewModel.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/settings/SettingsViewModel.kt
new file mode 100644
index 0000000..1328de3
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/settings/SettingsViewModel.kt
@@ -0,0 +1,121 @@
+package de.tsschulz.timeclock.ui.settings
+
+import android.app.Application
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import de.tsschulz.timeclock.data.api.InvitationDto
+import de.tsschulz.timeclock.data.api.ProfileDto
+import de.tsschulz.timeclock.data.api.StateDto
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.api.TimewishDto
+import de.tsschulz.timeclock.data.api.WatcherDto
+import de.tsschulz.timeclock.data.auth.TokenStore
+import de.tsschulz.timeclock.data.settings.SettingsRepository
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
+data class SettingsUiState(
+    val loading: Boolean = false,
+    val error: String? = null,
+    val success: String? = null,
+    val profile: ProfileDto? = null,
+    val states: List<StateDto> = emptyList(),
+    val timewishes: List<TimewishDto> = emptyList(),
+    val invites: List<InvitationDto> = emptyList(),
+    val watchers: List<WatcherDto> = emptyList(),
+)
+
+class SettingsViewModel(
+    private val repository: SettingsRepository,
+) : ViewModel() {
+    private val _uiState = MutableStateFlow(SettingsUiState())
+    val uiState: StateFlow<SettingsUiState> = _uiState.asStateFlow()
+
+    fun loadPhase5() {
+        loadProfile()
+        loadTimewishes()
+        loadInvites()
+        loadWatchers()
+    }
+
+    fun loadProfile() = launchLoad {
+        copy(profile = repository.getProfile(), states = repository.getStates())
+    }
+
+    fun updateProfile(fullName: String, stateId: String?, weekWorkdays: Int, dailyHours: Double, preferredTitleType: Int) = launchMutation("Profil gespeichert") {
+        repository.updateProfile(fullName, stateId, weekWorkdays, dailyHours, preferredTitleType)
+        loadProfile()
+    }
+
+    fun changePassword(oldPassword: String, newPassword: String, confirmPassword: String) = launchMutation("Passwort geändert") {
+        repository.changePassword(oldPassword, newPassword, confirmPassword)
+    }
+
+    fun loadTimewishes() = launchLoad {
+        copy(timewishes = repository.getTimewishes())
+    }
+
+    fun createTimewish(day: Int, wishtype: Int, hours: Double?, startDate: String, endDate: String?) = launchMutation("Zeitwunsch gespeichert") {
+        repository.createTimewish(day, wishtype, hours, startDate, endDate)
+        loadTimewishes()
+    }
+
+    fun deleteTimewish(id: String) = launchMutation("Zeitwunsch gelöscht") {
+        repository.deleteTimewish(id)
+        loadTimewishes()
+    }
+
+    fun loadInvites() = launchLoad {
+        copy(invites = repository.getInvites())
+    }
+
+    fun sendInvite(email: String) = launchMutation("Einladung gesendet") {
+        repository.sendInvite(email)
+        loadInvites()
+    }
+
+    fun loadWatchers() = launchLoad {
+        copy(watchers = repository.getWatchers())
+    }
+
+    fun addWatcher(email: String) = launchMutation("Zugriff gespeichert") {
+        repository.addWatcher(email)
+        loadWatchers()
+    }
+
+    fun deleteWatcher(id: String) = launchMutation("Zugriff entfernt") {
+        repository.deleteWatcher(id)
+        loadWatchers()
+    }
+
+    private fun launchLoad(reducer: suspend SettingsUiState.() -> SettingsUiState) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(loading = true, error = null, success = null) }
+            runCatching { _uiState.value.reducer() }
+                .onSuccess { next -> _uiState.value = next.copy(loading = false, error = null) }
+                .onFailure { e -> _uiState.update { it.copy(loading = false, error = e.message ?: "Daten konnten nicht geladen werden") } }
+        }
+    }
+
+    private fun launchMutation(successMessage: String, block: suspend () -> Unit) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(loading = true, error = null, success = null) }
+            runCatching { block() }
+                .onSuccess { _uiState.update { it.copy(success = successMessage) } }
+                .onFailure { e -> _uiState.update { it.copy(error = e.message ?: "Aktion fehlgeschlagen") } }
+            _uiState.update { it.copy(loading = false) }
+        }
+    }
+
+    class Factory(private val application: Application) : ViewModelProvider.Factory {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel> create(modelClass: Class<T>): T {
+            val tokenStore = TokenStore(application)
+            return SettingsViewModel(SettingsRepository(TimeClockApiClient(tokenStore))) as T
+        }
+    }
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/theme/TimeClockTheme.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/theme/TimeClockTheme.kt
new file mode 100644
index 0000000..66dae80
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/theme/TimeClockTheme.kt
@@ -0,0 +1,87 @@
+package de.tsschulz.timeclock.ui.theme
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.lightColorScheme
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+
+object TcColors {
+    val Background = Color.White
+    val Text = Color.Black
+    val TextMuted = Color(0xFF555555)
+    val Border = Color(0xFFE0E0E0)
+    val BorderSoft = Color(0xFFE0FFE0)
+    val Navbar = Color(0xFFF0FFEC)
+    val Card = Color(0xFFFAFAFA)
+    val Button = Color(0xFFF5F5F5)
+    val ButtonHover = Color(0xFFE5E5E5)
+    val ButtonBorder = Color(0xFFCCCCCC)
+    val Primary = Color(0xFF5BC0DE)
+    val PrimaryBorder = Color(0xFF46B8DA)
+    val PrimaryHover = Color(0xFF31B0D5)
+    val Success = Color(0xFF5CB85C)
+    val SuccessBorder = Color(0xFF4CAE4C)
+    val Danger = Color(0xFFD9534F)
+    val DangerBorder = Color(0xFFD43F3A)
+    val Secondary = Color(0xFF6C757D)
+    val InputBorder = Color(0xFFDDDDDD)
+    val ActiveMenu = Color(0xFFE8F5E9)
+    /** Login-Formular (Web: `.auth-form-container` / `h2`) */
+    val FormSurface = Color.White
+    val FormHeaderBg = Color(0xFFF5F5F5)
+    val AuthErrorBg = Color(0xFFF2DEDE)
+    val AuthErrorBorder = Color(0xFFEBCCD1)
+    val AuthErrorText = Color(0xFFA94442)
+    val GoogleText = Color(0xFF444444)
+    val DividerText = Color(0xFF999999)
+}
+
+object TcSpacing {
+    val Xs: Dp = 4.dp
+    val Sm: Dp = 8.dp
+    val Md: Dp = 12.dp
+    val Lg: Dp = 16.dp
+    val Xl: Dp = 24.dp
+    val Xxl: Dp = 32.dp
+    val WebContainer: Dp = 48.dp
+}
+
+object TcRadius {
+    val Small: Dp = 3.dp
+    val Medium: Dp = 4.dp
+    val Card: Dp = 6.dp
+    /** Web-Login-Container */
+    val AuthPanel: Dp = 8.dp
+}
+
+private val TimeClockColorScheme = lightColorScheme(
+    primary = TcColors.Primary,
+    secondary = TcColors.Secondary,
+    background = TcColors.Background,
+    surface = TcColors.Background,
+    surfaceVariant = TcColors.FormHeaderBg,
+    surfaceContainer = TcColors.Background,
+    surfaceContainerHigh = TcColors.FormSurface,
+    outline = TcColors.Border,
+    outlineVariant = TcColors.InputBorder,
+    onPrimary = Color.White,
+    onSecondary = Color.White,
+    onBackground = TcColors.Text,
+    onSurface = TcColors.Text,
+    onSurfaceVariant = TcColors.TextMuted,
+)
+
+@Composable
+fun TimeClockTheme(
+    darkTheme: Boolean = isSystemInDarkTheme(),
+    content: @Composable () -> Unit,
+) {
+    MaterialTheme(
+        colorScheme = TimeClockColorScheme,
+        typography = MaterialTheme.typography,
+        content = content,
+    )
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/time/TimeScreens.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/time/TimeScreens.kt
new file mode 100644
index 0000000..e3e8da9
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/time/TimeScreens.kt
@@ -0,0 +1,152 @@
+package de.tsschulz.timeclock.ui.time
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import de.tsschulz.timeclock.data.api.TimeEntryDto
+import de.tsschulz.timeclock.data.api.TimeStatsDto
+import de.tsschulz.timeclock.ui.components.TcButton
+import de.tsschulz.timeclock.ui.components.TcCard
+import de.tsschulz.timeclock.ui.components.TcError
+import de.tsschulz.timeclock.ui.components.TcLoading
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.theme.TcColors
+import de.tsschulz.timeclock.ui.theme.TcRadius
+import de.tsschulz.timeclock.ui.theme.TcSpacing
+import java.time.OffsetDateTime
+import java.time.format.DateTimeFormatter
+import java.util.Locale
+
+@Composable
+fun EntriesScreen(
+    entries: List<TimeEntryDto>,
+    loading: Boolean,
+    error: String?,
+    onRefresh: () -> Unit,
+    onDelete: (String) -> Unit,
+) {
+    TcCard {
+        Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween, verticalAlignment = Alignment.CenterVertically) {
+            SectionTitle("${entries.size} Einträge")
+            TcButton("Aktualisieren", variant = ButtonVariant.Secondary, onClick = onRefresh)
+        }
+    }
+    if (loading) TcLoading("Lade Einträge...")
+    error?.let { TcError(it) }
+    if (!loading && entries.isEmpty()) {
+        TcCard { Text("Keine Einträge vorhanden.", color = TcColors.TextMuted, fontSize = 14.sp) }
+    } else {
+        entries.forEach { entry -> EntryRow(entry, onDelete) }
+    }
+}
+
+@Composable
+fun StatsScreen(
+    stats: TimeStatsDto?,
+    loading: Boolean,
+    error: String?,
+    onRefresh: () -> Unit,
+) {
+    TcCard {
+        Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween, verticalAlignment = Alignment.CenterVertically) {
+            SectionTitle("Statistiken")
+            TcButton("Aktualisieren", variant = ButtonVariant.Secondary, onClick = onRefresh)
+        }
+    }
+    if (loading) TcLoading("Lade Statistiken...")
+    error?.let { TcError(it) }
+    val data = stats
+    if (data == null && !loading) {
+        TcCard { Text("Keine Statistiken vorhanden.", color = TcColors.TextMuted, fontSize = 14.sp) }
+        return
+    }
+    data?.let {
+        Row(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Lg), modifier = Modifier.fillMaxWidth()) {
+            StatCard("Arbeitszeit heute", it.currentlyWorked ?: "-", Modifier.weight(1f))
+            StatCard("Offen heute", it.open ?: "-", Modifier.weight(1f))
+        }
+        Row(horizontalArrangement = Arrangement.spacedBy(TcSpacing.Lg), modifier = Modifier.fillMaxWidth()) {
+            StatCard("Woche", it.weekWorktime ?: "-", Modifier.weight(1f))
+            StatCard("Überstunden", it.totalOvertime ?: it.overtime ?: "-", Modifier.weight(1f))
+        }
+        TcCard {
+            Detail("Reguläres Ende", it.regularEnd ?: "-")
+            Detail("Angepasstes Ende", it.adjustedEndTodayGeneral ?: it.adjustedEndToday ?: "-")
+            Detail("Fehlende Pause", it.missingBreakMinutes?.let { minutes -> "$minutes min" } ?: "-")
+            Detail("Nicht-Arbeitszeit", it.nonWorkingHours ?: "-")
+        }
+    }
+}
+
+@Composable
+private fun EntryRow(entry: TimeEntryDto, onDelete: (String) -> Unit) {
+    Row(
+        modifier = Modifier
+            .fillMaxWidth()
+            .background(TcColors.Background, RoundedCornerShape(TcRadius.Medium))
+            .border(1.dp, TcColors.Border, RoundedCornerShape(TcRadius.Medium))
+            .padding(TcSpacing.Md),
+        verticalAlignment = Alignment.CenterVertically,
+        horizontalArrangement = Arrangement.spacedBy(TcSpacing.Md),
+    ) {
+        Column(modifier = Modifier.weight(1f)) {
+            Text(entry.project ?: "Allgemein", color = TcColors.Text, fontSize = 14.sp, fontWeight = FontWeight.SemiBold)
+            Text(
+                "${entry.startTime.toDisplayDateTime()} - ${entry.endTime.toDisplayDateTime()} · ${entry.duration.toDurationText()}",
+                color = TcColors.TextMuted,
+                fontSize = 13.sp,
+            )
+            if (!entry.description.isNullOrBlank()) Text(entry.description, color = TcColors.TextMuted, fontSize = 13.sp)
+        }
+        Text(if (entry.isRunning) "Läuft" else "Beendet", color = if (entry.isRunning) TcColors.Danger else TcColors.Success, fontSize = 13.sp)
+        TcButton("Löschen", variant = ButtonVariant.Danger, onClick = { onDelete(entry.id) })
+    }
+}
+
+@Composable
+private fun StatCard(label: String, value: String, modifier: Modifier = Modifier) {
+    TcCard(modifier = modifier) {
+        Text(value, color = TcColors.Text, fontSize = 22.sp, fontWeight = FontWeight.Bold)
+        Text(label, color = TcColors.TextMuted, fontSize = 13.sp)
+    }
+}
+
+@Composable
+private fun SectionTitle(title: String) {
+    Text(title, color = TcColors.Text, fontSize = 18.sp, fontWeight = FontWeight.SemiBold)
+}
+
+@Composable
+private fun Detail(label: String, value: String) {
+    Row(modifier = Modifier.fillMaxWidth(), horizontalArrangement = Arrangement.SpaceBetween) {
+        Text(label, color = TcColors.TextMuted, fontSize = 14.sp)
+        Text(value, color = TcColors.Text, fontSize = 14.sp, fontWeight = FontWeight.Medium)
+    }
+}
+
+private fun String?.toDisplayDateTime(): String {
+    if (this.isNullOrBlank()) return "-"
+    return runCatching {
+        OffsetDateTime.parse(this).format(DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm", Locale.GERMANY))
+    }.getOrDefault(this)
+}
+
+private fun Long?.toDurationText(): String {
+    if (this == null) return "-"
+    val hours = this / 3600
+    val minutes = (this % 3600) / 60
+    val seconds = this % 60
+    return "%02d:%02d:%02d".format(hours, minutes, seconds)
+}
diff --git a/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/time/TimeViewModel.kt b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/time/TimeViewModel.kt
new file mode 100644
index 0000000..7668e5c
--- /dev/null
+++ b/mobile-app/composeApp/src/main/kotlin/de/tsschulz/timeclock/ui/time/TimeViewModel.kt
@@ -0,0 +1,224 @@
+package de.tsschulz.timeclock.ui.time
+
+import android.app.Application
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import de.tsschulz.timeclock.data.api.TimeClockApiClient
+import de.tsschulz.timeclock.data.api.TimeEntryDto
+import de.tsschulz.timeclock.data.api.TimeStatsDto
+import de.tsschulz.timeclock.data.api.WeekOverviewDto
+import de.tsschulz.timeclock.data.auth.TokenStore
+import de.tsschulz.timeclock.data.offline.OfflineClockQueue
+import de.tsschulz.timeclock.data.time.TimeDashboard
+import de.tsschulz.timeclock.data.time.TimeRepository
+import de.tsschulz.timeclock.ui.model.ButtonVariant
+import de.tsschulz.timeclock.ui.model.StatusAction
+import de.tsschulz.timeclock.ui.model.StatusRow
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import java.time.OffsetDateTime
+import java.time.format.DateTimeFormatter
+import java.util.Locale
+
+data class TimeUiState(
+    val loading: Boolean = false,
+    val clockInProgress: Boolean = false,
+    val error: String? = null,
+    val dashboard: TimeDashboard? = null,
+    val statusRows: List<StatusRow> = listOf(StatusRow(label = "Heute", isHeading = true), StatusRow("Status", "—")),
+    val primaryAction: StatusAction? = null,
+    val secondaryAction: StatusAction? = null,
+    val weekLoading: Boolean = false,
+    val weekOffset: Int = 0,
+    val week: WeekOverviewDto? = null,
+    val weekError: String? = null,
+    val entries: List<TimeEntryDto> = emptyList(),
+    val entriesLoading: Boolean = false,
+    val entriesError: String? = null,
+    val stats: TimeStatsDto? = null,
+    val statsLoading: Boolean = false,
+    val statsError: String? = null,
+)
+
+class TimeViewModel(
+    private val repository: TimeRepository,
+) : ViewModel() {
+
+    private val _uiState = MutableStateFlow(TimeUiState())
+    val uiState: StateFlow<TimeUiState> = _uiState.asStateFlow()
+    private var refreshJob: Job? = null
+
+    fun start() {
+        if (refreshJob != null) return
+        refreshJob = viewModelScope.launch {
+            refreshAll()
+            while (true) {
+                delay(30_000)
+                refreshDashboard()
+            }
+        }
+    }
+
+    fun stop() {
+        refreshJob?.cancel()
+        refreshJob = null
+        _uiState.value = TimeUiState()
+    }
+
+    fun refreshAll() {
+        refreshDashboard()
+        loadWeek(_uiState.value.weekOffset)
+    }
+
+    fun refreshDashboard() {
+        viewModelScope.launch {
+            _uiState.update { it.copy(loading = true, error = null) }
+            runCatching { repository.loadDashboard() }
+                .onSuccess { dashboard ->
+                    _uiState.update {
+                        it.copy(
+                            loading = false,
+                            dashboard = dashboard,
+                            statusRows = dashboard.toStatusRows(),
+                            primaryAction = dashboard.primaryAction(),
+                            secondaryAction = dashboard.secondaryAction(),
+                            error = null,
+                        )
+                    }
+                }
+                .onFailure { e ->
+                    _uiState.update { it.copy(loading = false, error = e.message ?: "Status konnte nicht geladen werden") }
+                }
+        }
+    }
+
+    fun clock(action: String) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(clockInProgress = true, error = null) }
+            runCatching { repository.clock(action) }
+                .onSuccess { dashboard ->
+                    _uiState.update {
+                        it.copy(
+                            clockInProgress = false,
+                            dashboard = dashboard,
+                            statusRows = dashboard.toStatusRows(),
+                            primaryAction = dashboard.primaryAction(),
+                            secondaryAction = dashboard.secondaryAction(),
+                            error = null,
+                        )
+                    }
+                    loadWeek(_uiState.value.weekOffset)
+                }
+                .onFailure { e ->
+                    _uiState.update { it.copy(clockInProgress = false, error = e.message ?: "Stempeln fehlgeschlagen") }
+                }
+        }
+    }
+
+    fun loadWeek(weekOffset: Int) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(weekLoading = true, weekError = null, weekOffset = weekOffset) }
+            runCatching { repository.loadWeek(weekOffset) }
+                .onSuccess { week ->
+                    _uiState.update { it.copy(weekLoading = false, week = week, weekError = null) }
+                }
+                .onFailure { e ->
+                    _uiState.update {
+                        it.copy(weekLoading = false, weekError = e.message ?: "Wochenübersicht konnte nicht geladen werden")
+                    }
+                }
+        }
+    }
+
+    fun loadEntries() {
+        viewModelScope.launch {
+            _uiState.update { it.copy(entriesLoading = true, entriesError = null) }
+            runCatching { repository.loadEntries() }
+                .onSuccess { entries -> _uiState.update { it.copy(entriesLoading = false, entries = entries) } }
+                .onFailure { e -> _uiState.update { it.copy(entriesLoading = false, entriesError = e.message ?: "Einträge konnten nicht geladen werden") } }
+        }
+    }
+
+    fun deleteEntry(id: String) {
+        viewModelScope.launch {
+            _uiState.update { it.copy(entriesLoading = true, entriesError = null) }
+            runCatching {
+                repository.deleteEntry(id)
+                repository.loadEntries()
+            }
+                .onSuccess { entries -> _uiState.update { it.copy(entriesLoading = false, entries = entries) } }
+                .onFailure { e -> _uiState.update { it.copy(entriesLoading = false, entriesError = e.message ?: "Eintrag konnte nicht gelöscht werden") } }
+        }
+    }
+
+    fun loadStats() {
+        viewModelScope.launch {
+            _uiState.update { it.copy(statsLoading = true, statsError = null) }
+            runCatching { repository.loadStats() }
+                .onSuccess { stats -> _uiState.update { it.copy(statsLoading = false, stats = stats) } }
+                .onFailure { e -> _uiState.update { it.copy(statsLoading = false, statsError = e.message ?: "Statistiken konnten nicht geladen werden") } }
+        }
+    }
+
+    private fun TimeDashboard.toStatusRows(): List<StatusRow> {
+        val stats = stats
+        return buildList {
+            add(StatusRow(label = "Heute", isHeading = true))
+            add(StatusRow("Status", state.toStatusText()))
+            if (runningStartTime != null) add(StatusRow("Beginn", runningStartTime.toDisplayTime()))
+            if (currentPauseStart != null) add(StatusRow("Pause seit", currentPauseStart.toDisplayTime()))
+            add(StatusRow("Arbeitszeit", stats.currentlyWorked ?: "—"))
+            add(StatusRow("Offen", stats.open ?: "—"))
+            add(StatusRow("Woche", stats.weekWorktime ?: "—"))
+            add(StatusRow("Überstunden", stats.overtime ?: "—"))
+            add(StatusRow("Gesamt", stats.totalOvertime ?: "—"))
+            add(StatusRow("Arbeitsende", stats.adjustedEndTodayGeneral ?: stats.regularEnd ?: "—"))
+        }
+    }
+
+    private fun TimeDashboard.primaryAction(): StatusAction? =
+        when (state) {
+            null, "stop work" -> StatusAction("Kommen", ButtonVariant.Success, "start work")
+            "start work", "stop pause" -> StatusAction("Pause starten", ButtonVariant.Default, "start pause")
+            "start pause" -> StatusAction("Pause beenden", ButtonVariant.Success, "stop pause")
+            else -> StatusAction("Kommen", ButtonVariant.Success, "start work")
+        }
+
+    private fun TimeDashboard.secondaryAction(): StatusAction? =
+        when (state) {
+            "start work", "stop pause" -> StatusAction("Gehen", ButtonVariant.Secondary, "stop work")
+            else -> null
+        }
+
+    private fun String?.toStatusText(): String =
+        when (this) {
+            null, "stop work" -> "Nicht eingestempelt"
+            "start work" -> "Arbeit läuft"
+            "start pause" -> "Pause läuft"
+            "stop pause" -> "Arbeit läuft"
+            else -> this
+        }
+
+    private fun String.toDisplayTime(): String =
+        runCatching {
+            OffsetDateTime.parse(this).toLocalTime().format(DateTimeFormatter.ofPattern("HH:mm", Locale.GERMANY))
+        }.getOrDefault(this)
+
+    class Factory(
+        private val application: Application,
+    ) : ViewModelProvider.Factory {
+        @Suppress("UNCHECKED_CAST")
+        override fun <T : ViewModel> create(modelClass: Class<T>): T {
+            val tokenStore = TokenStore(application)
+            val api = TimeClockApiClient(tokenStore)
+            val repo = TimeRepository(api, OfflineClockQueue(application))
+            return TimeViewModel(repo) as T
+        }
+    }
+}
diff --git a/mobile-app/composeApp/src/main/res/drawable-nodpi/ic_stechuhr_logo.png b/mobile-app/composeApp/src/main/res/drawable-nodpi/ic_stechuhr_logo.png
new file mode 100644
index 0000000..c13effb
Binary files /dev/null and b/mobile-app/composeApp/src/main/res/drawable-nodpi/ic_stechuhr_logo.png differ
diff --git a/mobile-app/composeApp/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/mobile-app/composeApp/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..73ebd59
--- /dev/null
+++ b/mobile-app/composeApp/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,4 @@
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_stechuhr_logo" />
+</adaptive-icon>
diff --git a/mobile-app/composeApp/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/mobile-app/composeApp/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000..73ebd59
--- /dev/null
+++ b/mobile-app/composeApp/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,4 @@
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_stechuhr_logo" />
+</adaptive-icon>
diff --git a/mobile-app/composeApp/src/main/res/values/colors.xml b/mobile-app/composeApp/src/main/res/values/colors.xml
new file mode 100644
index 0000000..c70cd06
--- /dev/null
+++ b/mobile-app/composeApp/src/main/res/values/colors.xml
@@ -0,0 +1,3 @@
+<resources>
+    <color name="ic_launcher_background">#F0FFEC</color>
+</resources>
diff --git a/mobile-app/composeApp/src/main/res/values/styles.xml b/mobile-app/composeApp/src/main/res/values/styles.xml
new file mode 100644
index 0000000..9498297
--- /dev/null
+++ b/mobile-app/composeApp/src/main/res/values/styles.xml
@@ -0,0 +1,8 @@
+<resources>
+    <style name="Theme.TimeClock" parent="android:style/Theme.Material.Light.NoActionBar">
+        <item name="android:fontFamily">sans</item>
+        <item name="android:windowLightStatusBar">true</item>
+        <item name="android:statusBarColor">#F0FFEC</item>
+        <item name="android:navigationBarColor">#FFFFFF</item>
+    </style>
+</resources>
diff --git a/mobile-app/composeApp/src/test/kotlin/de/tsschulz/timeclock/data/api/ApiSerializationTest.kt b/mobile-app/composeApp/src/test/kotlin/de/tsschulz/timeclock/data/api/ApiSerializationTest.kt
new file mode 100644
index 0000000..dd503c5
--- /dev/null
+++ b/mobile-app/composeApp/src/test/kotlin/de/tsschulz/timeclock/data/api/ApiSerializationTest.kt
@@ -0,0 +1,111 @@
+package de.tsschulz.timeclock.data.api
+
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.Json
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class ApiSerializationTest {
+    private val json = Json {
+        ignoreUnknownKeys = true
+        isLenient = true
+        coerceInputValues = true
+    }
+
+    @Test
+    fun loginResponseMapsWebUserFields() {
+        val raw = """
+            {
+              "success": true,
+              "token": "jwt",
+              "user": {
+                "id": 1,
+                "full_name": "Max Mustermann",
+                "email": "max@example.com",
+                "role": 1,
+                "daily_hours": 8,
+                "week_workdays": 5
+              }
+            }
+        """.trimIndent()
+
+        val decoded = json.decodeFromString(LoginResponse.serializer(), raw)
+
+        assertTrue(decoded.success)
+        assertEquals("jwt", decoded.token)
+        assertEquals("Max Mustermann", decoded.user?.fullName)
+        assertEquals(1, decoded.user?.role)
+        assertEquals(5, decoded.user?.weekWorkdays)
+    }
+
+    @Test
+    fun protectedIdsDecodeAsStrings() {
+        val raw = """
+            [
+              {
+                "id": "abc.def",
+                "project": "Allgemein",
+                "description": "Test",
+                "startTime": "2026-05-14T08:00:00+02:00",
+                "endTime": null,
+                "duration": 3600,
+                "isRunning": true
+              }
+            ]
+        """.trimIndent()
+
+        val decoded = json.decodeFromString(ListSerializer(TimeEntryDto.serializer()), raw)
+
+        assertEquals("abc.def", decoded.first().id)
+        assertTrue(decoded.first().isRunning)
+        assertEquals(3600L, decoded.first().duration)
+    }
+
+    @Test
+    fun holidayResponseKeepsFutureAndPastBuckets() {
+        val raw = """
+            {
+              "future": [
+                {
+                  "id": "holiday.hash",
+                  "date": "2026-10-03",
+                  "hours": 8,
+                  "description": "Tag der Deutschen Einheit",
+                  "states": [],
+                  "isFederal": true
+                }
+              ],
+              "past": []
+            }
+        """.trimIndent()
+
+        val decoded = json.decodeFromString(HolidaysResponse.serializer(), raw)
+
+        assertEquals(1, decoded.future.size)
+        assertEquals("Tag der Deutschen Einheit", decoded.future.first().description)
+        assertTrue(decoded.future.first().isFederal)
+        assertTrue(decoded.past.isEmpty())
+    }
+
+    @Test
+    fun roleUserDecodesUserRole() {
+        val raw = """
+            {
+              "id": "user.hash",
+              "fullName": "Erika Musterfrau",
+              "role": 0,
+              "roleString": "user",
+              "stateName": "Nordrhein-Westfalen"
+            }
+        """.trimIndent()
+
+        val decoded = json.decodeFromString(RoleUserDto.serializer(), raw)
+
+        assertEquals("user.hash", decoded.id)
+        assertEquals("Erika Musterfrau", decoded.fullName)
+        assertFalse(decoded.role == 1)
+        assertEquals("Nordrhein-Westfalen", decoded.stateName)
+    }
+}
diff --git a/mobile-app/composeApp/src/test/kotlin/de/tsschulz/timeclock/data/offline/PendingClockActionTest.kt b/mobile-app/composeApp/src/test/kotlin/de/tsschulz/timeclock/data/offline/PendingClockActionTest.kt
new file mode 100644
index 0000000..3da2312
--- /dev/null
+++ b/mobile-app/composeApp/src/test/kotlin/de/tsschulz/timeclock/data/offline/PendingClockActionTest.kt
@@ -0,0 +1,25 @@
+package de.tsschulz.timeclock.data.offline
+
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.Json
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class PendingClockActionTest {
+    private val json = Json { ignoreUnknownKeys = true }
+
+    @Test
+    fun pendingClockActionsRoundTrip() {
+        val actions = listOf(
+            PendingClockAction(id = "1", action = "start work", createdAtEpochMillis = 1_777_000_000_000),
+            PendingClockAction(id = "2", action = "stop work", createdAtEpochMillis = 1_777_000_300_000),
+        )
+
+        val raw = json.encodeToString(ListSerializer(PendingClockAction.serializer()), actions)
+        val decoded = json.decodeFromString(ListSerializer(PendingClockAction.serializer()), raw)
+
+        assertEquals(actions, decoded)
+        assertEquals("start work", decoded.first().action)
+        assertEquals("stop work", decoded.last().action)
+    }
+}
diff --git a/mobile-app/gradle.properties b/mobile-app/gradle.properties
new file mode 100644
index 0000000..b143796
--- /dev/null
+++ b/mobile-app/gradle.properties
@@ -0,0 +1,4 @@
+android.useAndroidX=true
+android.nonTransitiveRClass=true
+org.gradle.jvmargs=-Xmx3072m -Dfile.encoding=UTF-8
+org.jetbrains.kotlin.code.style=official
diff --git a/mobile-app/gradle/wrapper/gradle-wrapper.jar b/mobile-app/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..61285a6
Binary files /dev/null and b/mobile-app/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/mobile-app/gradle/wrapper/gradle-wrapper.properties b/mobile-app/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..37f78a6
--- /dev/null
+++ b/mobile-app/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/mobile-app/gradlew b/mobile-app/gradlew
new file mode 100755
index 0000000..adff685
--- /dev/null
+++ b/mobile-app/gradlew
@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/mobile-app/gradlew.bat b/mobile-app/gradlew.bat
new file mode 100644
index 0000000..e509b2d
--- /dev/null
+++ b/mobile-app/gradlew.bat
@@ -0,0 +1,93 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/mobile-app/settings.gradle.kts b/mobile-app/settings.gradle.kts
new file mode 100644
index 0000000..8fc98c1
--- /dev/null
+++ b/mobile-app/settings.gradle.kts
@@ -0,0 +1,18 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.name = "mobile-app"
+include(":composeApp")