commit cb30223fd4d6430a7ae2b089874a98779085735c
Author: Tronax <mail@tronax.dev>
Date:   Tue Aug 25 18:50:28 2026 +0200

    feat: add WannPassts booking app with Go backend and Vue frontend
    
    Initial project setup for a privacy-focused, self-hosted scheduling app:
    
    - Go backend with JWT auth, SQLite storage, and chi router
    - Calendar integrations via Google OAuth (FreeBusy), CalDAV, and ICS links
    - Public booking pages with configurable slots and booking requests
    - AES-256-GCM encryption for stored provider tokens
    - Vue 3 + TypeScript frontend with Vite, Pinia, and Vue Router
    - Docs, .gitignore, and .env.example for local development

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0561533
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,45 @@
+# ─── Node / Frontend ────────────────────────────────────────────────
+node_modules/
+frontend/dist/
+frontend/node_modules/
+*.local
+npm-debug.log*
+.vite/
+
+# ─── Go / Backend ───────────────────────────────────────────────────
+backend/cmd/server/server
+backend/server
+backend/wannpassts-server
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+coverage.out
+
+# ─── SQLite-Datenbanken (Nutzerdaten!) ──────────────────────────────
+*.db
+*.db-wal
+*.db-shm
+
+# ─── Geheimnisse & Konfiguration ────────────────────────────────────
+# .env enthält Secrets – .env.example bleibt versioniert.
+.env
+.env.*
+!.env.example
+
+# ─── Editoren & Betriebssysteme ─────────────────────────────────────
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.DS_Store
+Thumbs.db
+
+# ─── Sonstiges ──────────────────────────────────────────────────────
+logs/
+*.log
+tmp/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3cded8b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,132 @@
+# WannPassts
+
+**Deine freien Zeiten – geteilt per Link. Ohne deine Termine preiszugeben.**
+
+WannPassts ist eine Self-Hosted-Buchungs-App (à la Cal.com / Calendly, aber privat):
+Du verbindest deine Kalender, teilst einen Link, und andere sehen nur **frei / belegt**
+und stellen Buchungsanfragen. Termintitel, Orte und Beschreibungen verlassen deine
+Kalender nie.
+
+## Features
+
+- 🔐 **Registrierung/Login** (JWT, bcrypt-Passwort-Hashes)
+- 📆 **Kalender-Connect:**
+  - **Google Kalender** per OAuth – nutzt die FreeBusy-API, die *strukturell* keine Termindetails liefert
+  - **iCloud** & andere (Fastmail, Nextcloud, …) per **CalDAV** – iCloud mit App-spezifischem Passwort
+  - **Beliebige ICS-/webcal-Links** (z. B. Google-„Private Adresse“, Ferien-/Schichtpläne)
+- 🔗 **Öffentliche Buchungsseite** (`/b/<slug>`): freie Slots im von dir definierten Zeitfenster, Wochentage, Slot-Raster und Dauern – **niemals Termindetails**
+- 📨 **Buchungsanfragen** annehmen/ablehnen; angenommene Zeiten werden belegt und verhindern Doppelbuchungen
+- ⚙️ Buchungsregeln: Zeitfenster, Slot-Raster (10–60 Min), Dauern, Wochentage, Horizont (1–120 Tage), Zeitzone
+- 🧊 **Liquid-Glass-Dark-UI** (Glassmorphism, animierte Orbs), komplett auf Deutsch
+- 🔒 Provider-Tokens werden **AES-256-GCM-verschlüsselt** in der SQLite-DB gespeichert
+
+## Tech Stack
+
+| Teil     | Technologie                                                        |
+| -------- | ------------------------------------------------------------------ |
+| Frontend | Vue 3 + TypeScript, Vite, Pinia, Vue Router (kein UI-Framework)     |
+| Backend  | Go, chi, JWT, SQLite (modernc, CGO-frei), x/oauth2, go-webdav       |
+
+## Schnellstart (Entwicklung)
+
+```bash
+# Terminal 1 – Backend (http://localhost:8080)
+cd backend
+cp .env.example .env        # optional anpassen; ohne .env läuft es mit Defaults
+go run ./cmd/server
+
+# Terminal 2 – Frontend (http://localhost:5173, Proxied /api → 8080)
+cd frontend
+npm install
+npm run dev
+```
+
+Dann http://localhost:5173 öffnen, Konto erstellen, Kalender verbinden, Link teilen. 🎉
+
+## Produktion (ein einziger Go-Prozess)
+
+```bash
+cd frontend && npm run build && cd ..
+cd backend
+STATIC_DIR=../frontend/dist \
+APP_URL=https://deine-domain.de \
+FRONTEND_URL=https://deine-domain.de \
+JWT_SECRET=$(openssl rand -hex 32) \
+ENCRYPTION_KEY=$(openssl rand -hex 32) \
+go run ./cmd/server
+```
+
+Der Go-Server liefert dann das Frontend (`dist/`) **und** die API über einen Port.
+
+## Kalender-Anbindung einrichten
+
+### Google
+1. [Google Cloud Console](https://console.cloud.google.com): Projekt anlegen, **Google Calendar API** aktivieren.
+2. OAuth-Zustimmungsbildschirm (External) einrichten, Scope `calendar.readonly`.
+3. **OAuth-Client-ID** (Webanwendung) erstellen; als autorisierte Redirect-URI
+   `{APP_URL}/api/calendars/google/callback` eintragen (lokal: `http://localhost:8080/api/calendars/google/callback`).
+4. `GOOGLE_CLIENT_ID` + `GOOGLE_CLIENT_SECRET` in `backend/.env` setzen.
+
+Beim Verbinden wird nur der **Primärkalender** angebunden; gelesen wird ausschließlich Free/Busy.
+
+### iCloud
+1. Auf [appleid.apple.com](https://appleid.apple.com/account/manage) → *Anmeldung und Sicherheit* → **App-spezifisches Passwort** erzeugen.
+2. In WannPassts: *Kalender → iCloud / CalDAV*:
+   - Server: `https://caldav.icloud.com`
+   - Benutzername: Apple-ID (E-Mail)
+   - Passwort: das App-spezifische Passwort (nicht das normale!)
+3. Der erste Kalender mit Terminen wird automatisch erkannt (Kalender-Pfad ist optional manuell überschreibbar).
+
+### Andere (Fastmail, Nextcloud, GMX, …)
+Gleiche CalDAV-Maske mit dem jeweiligen CalDAV-Server des Anbieters, oder beliebige **ICS-Links** abonnieren.
+
+## Datenschutz-Design
+
+- Besucher sehen ausschließlich **Start/Ende von busy-Zeiträumen** – die API hat gar keine Felder für Titel & Co.
+- Google: FreeBusy-API liefert von sich aus nur Belegungszeiträume.
+- CalDAV/ICS: Termine werden serverseitig auf `DTSTART/DTEND` reduziert, abgesagte und „Verfügbar“-Termine (TRANSPARENT) werden ignoriert.
+- Tokens/Passwörter der Verbindungen liegen verschlüsselt (AES-GCM aus `ENCRYPTION_KEY`) in der DB.
+- Sync erfolgt bedarfsgesteuert (max. alle 5 Min) beim Aufruf der Buchungsseite plus manueller Button.
+
+## Bekannte Grenzen (MVP)
+
+- **Kein E-Mail-Versand** – Anfragen/Freigaben erscheinen nur im Dashboard (Mail-Versand via SMTP wäre der nächste Ausbauschritt).
+- **ICS-Abos** expandieren Serientermine nicht**; CalDAV und Google tun dies serverseitig korrekt.
+- **Ausstehende (pending) Anfragen blockieren noch keine Zeit** – erst angenommene. Bei zwei parallelen Anfragen für denselben Slot gewinnt, wer zuerst angenommen wird (Kollision wird beim Annehmen geprüft).
+- Ein Google-Konto verbindet aktuell den Primärkalender; weitere Kalender lassen sich als ICS-Abo hinzufügen.
+
+## Projektstruktur
+
+```
+backend/
+  cmd/server/            # Einstieg
+  internal/config/       # Env-/Secret-Handling
+  internal/db/           # SQLite-Schema & Queries
+  internal/crypto/       # AES-GCM für gespeicherte Provider-Tokens
+  internal/calendar/     # Provider: google.go, caldav.go, ics.go (+ Syncer)
+  internal/httpapi/      # Router, Middleware, Handler (auth, calendars, bookings, public)
+frontend/
+  src/lib/               # api-Client, Typen, Zeitzonen-Helfer
+  src/stores/            # Pinia: auth, toast
+  src/views/             # Landing, Login, Register, Dashboard, Booking (/b/:slug)
+  src/components/        # GlassCard, ShareLink, Sektionen (Kalender/Anfragen/Einstellungen)
+  src/styles/main.css    # Liquid-Glass-Dark-Designsystem
+```
+
+## API-Überblick
+
+| Methode             | Pfad                              | Auth | Zweck                                    |
+| ------------------- | --------------------------------- | ---- | ---------------------------------------- |
+| POST                | `/api/auth/register` \| `/login`  | –    | Konto / JWT                              |
+| GET/PATCH           | `/api/me`                         | ✅   | Profil & Buchungsregeln                  |
+| POST                | `/api/me/slug`                    | ✅   | Neuen Buchungslink erzeugen              |
+| GET/DELETE          | `/api/calendars…`                 | ✅   | Verbinden (google/caldav/ics), verwalten, sync |
+| GET                 | `/api/public/{slug}`              | –    | Buchungsseite: Regeln + busy-Zeiträume   |
+| POST                | `/api/public/{slug}/bookings`     | –    | Buchungsanfrage stellen                  |
+| GET                 | `/api/bookings`, `…/accept\|decline` | ✅ | Anfragen verwalten                    |
+
+## Tests
+
+```bash
+cd backend && go test ./...   # ICS-Parser, Dauer-Handling, Interval-Clamping
+```
diff --git a/backend/.env.example b/backend/.env.example
new file mode 100644
index 0000000..54f1eeb
--- /dev/null
+++ b/backend/.env.example
@@ -0,0 +1,33 @@
+# ─── WannPassts Backend Konfiguration ────────────────────────────────────────
+# Diese Datei nach backend/.env kopieren und anpassen.
+
+# HTTP-Port des Backends
+PORT=8080
+
+# SQLite-Datenbankdatei (relativ zum backend-Verzeichnis)
+DB_PATH=wannpassts.db
+
+# Öffentliche URL des Backends (wichtig für den Google-OAuth-Redirect!)
+APP_URL=http://localhost:8080
+
+# URL des Frontends (dev: Vite, prod: gleiche Origin wie StaticDir)
+FRONTEND_URL=http://localhost:5173
+
+# Statische Secrets – in Produktion zwingend setzen (z. B. `openssl rand -hex 32`)
+# JWT_SECRET sichert Logins, ENCRYPTION_KEY verschlüsselt gespeicherte Kalender-Tokens.
+JWT_SECRET=
+ENCRYPTION_KEY=
+
+# ─── Google Kalender (OAuth) ─────────────────────────────────────────────────
+# 1. https://console.cloud.google.com → Projekt anlegen
+# 2. APIs & Services → „Google Calendar API“ aktivieren
+# 3. OAuth-Zustimmungsbildschirm: External, Scope calendar.readonly
+# 4. Credentials → OAuth-Client-ID (Webanwendung)
+#    Autorisierte Redirect-URI: {APP_URL}/api/calendars/google/callback
+#    (lokal also http://localhost:8080/api/calendars/google/callback)
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+
+# ─── Optional: Frontend-Build direkt ausliefern (Produktion) ────────────────
+# cd frontend && npm run build  →  STATIC_DIR=../frontend/dist
+STATIC_DIR=
diff --git a/backend/cmd/server/main.go b/backend/cmd/server/main.go
new file mode 100644
index 0000000..de3be6f
--- /dev/null
+++ b/backend/cmd/server/main.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"wannpassts/internal/calendar"
+	"wannpassts/internal/config"
+	"wannpassts/internal/db"
+	"wannpassts/internal/httpapi"
+)
+
+func main() {
+	cfg := config.Load()
+
+	database, err := db.Open(cfg.DBPath)
+	if err != nil {
+		log.Fatalf("Datenbank konnte nicht geöffnet werden: %v", err)
+	}
+	defer database.Close()
+
+	syncer := &calendar.Syncer{DB: database, Cfg: &cfg}
+	srv := httpapi.New(database, &cfg, syncer)
+
+	addr := ":" + cfg.Port
+	log.Printf("WannPassts Backend läuft auf http://localhost%s", addr)
+	if err := http.ListenAndServe(addr, srv.Router()); err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/backend/go.mod b/backend/go.mod
new file mode 100644
index 0000000..999d068
--- /dev/null
+++ b/backend/go.mod
@@ -0,0 +1,29 @@
+module wannpassts
+
+go 1.25.0
+
+require (
+	github.com/emersion/go-ical v0.0.0-20250609112844-439c63cef608
+	github.com/emersion/go-webdav v0.7.0
+	github.com/go-chi/chi/v5 v5.3.2
+	github.com/go-chi/cors v1.2.2
+	github.com/golang-jwt/jwt/v5 v5.3.1
+	github.com/joho/godotenv v1.5.1
+	golang.org/x/crypto v0.55.0
+	golang.org/x/oauth2 v0.36.0
+	modernc.org/sqlite v1.57.0
+)
+
+require (
+	cloud.google.com/go/compute/metadata v0.3.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/mattn/go-isatty v0.0.24 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/teambition/rrule-go v1.8.2 // indirect
+	golang.org/x/sys v0.47.0 // indirect
+	modernc.org/libc v1.74.4 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
+)
diff --git a/backend/go.sum b/backend/go.sum
new file mode 100644
index 0000000..03bb08b
--- /dev/null
+++ b/backend/go.sum
@@ -0,0 +1,72 @@
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diff --git a/backend/internal/calendar/caldav.go b/backend/internal/calendar/caldav.go
new file mode 100644
index 0000000..57b6f90
--- /dev/null
+++ b/backend/internal/calendar/caldav.go
@@ -0,0 +1,126 @@
+package calendar
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/emersion/go-ical"
+	"github.com/emersion/go-webdav/caldav"
+)
+
+// CalDAVConnConfig deckt iCloud (https://caldav.icloud.com mit App-spezifischem
+// Passwort) sowie Fastmail, Nextcloud und andere CalDAV-Server ab.
+type CalDAVConnConfig struct {
+	ServerURL    string `json:"server_url"`
+	Username     string `json:"username"`
+	Password     string `json:"password"`
+	CalendarPath string `json:"calendar_path"`
+}
+
+type CalDAVProvider struct {
+	cfg CalDAVConnConfig
+}
+
+func NewCalDAVProvider(cfg CalDAVConnConfig) *CalDAVProvider {
+	return &CalDAVProvider{cfg: cfg}
+}
+
+type basicAuthTransport struct {
+	username, password string
+}
+
+func (t *basicAuthTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	clone := req.Clone(req.Context())
+	clone.SetBasicAuth(t.username, t.password)
+	return http.DefaultTransport.RoundTrip(clone)
+}
+
+func newCalDAVClient(cfg CalDAVConnConfig) (*caldav.Client, error) {
+	hc := &http.Client{Transport: &basicAuthTransport{cfg.Username, cfg.Password}}
+	return caldav.NewClient(hc, cfg.ServerURL)
+}
+
+// DiscoverCalDAV findet automatisch den ersten Kalender mit Terminen (VEVENT)
+// auf dem Server. Für iCloud: Apple-ID als Benutzername und ein im Apple-ID-
+// Konto erzeugtes App-spezifisches Passwort.
+func DiscoverCalDAV(ctx context.Context, cfg CalDAVConnConfig) (path, name string, err error) {
+	c, err := newCalDAVClient(cfg)
+	if err != nil {
+		return "", "", fmt.Errorf("CalDAV-Server-URL ungültig: %w", err)
+	}
+	principal, err := c.FindCurrentUserPrincipal(ctx)
+	if err != nil {
+		return "", "", fmt.Errorf("CalDAV: Anmeldung/Principal fehlgeschlagen (Zugangsdaten prüfen; iCloud braucht ein App-spezifisches Passwort): %w", err)
+	}
+	homeSet, err := c.FindCalendarHomeSet(ctx, principal)
+	if err != nil {
+		return "", "", fmt.Errorf("CalDAV: Kalender-Verzeichnis nicht gefunden: %w", err)
+	}
+	cals, err := c.FindCalendars(ctx, homeSet)
+	if err != nil {
+		return "", "", fmt.Errorf("CalDAV: Kalender konnten nicht geladen werden: %w", err)
+	}
+	for _, cal := range cals {
+		for _, comp := range cal.SupportedComponentSet {
+			if strings.EqualFold(comp, "VEVENT") {
+				return cal.Path, cal.Name, nil
+			}
+		}
+	}
+	return "", "", fmt.Errorf("CalDAV: kein Kalender mit Terminen gefunden")
+}
+
+func (p *CalDAVProvider) FetchBusy(ctx context.Context, from, to time.Time) ([]Interval, error) {
+	c, err := newCalDAVClient(p.cfg)
+	if err != nil {
+		return nil, err
+	}
+	// Der Zeitfilter auf dem Server expandiert auch Serientermine (RFC 4791).
+	query := &caldav.CalendarQuery{
+		CompRequest: caldav.CalendarCompRequest{
+			Name:  "VCALENDAR",
+			Comps: []caldav.CalendarCompRequest{{Name: "VEVENT"}},
+		},
+		CompFilter: caldav.CompFilter{
+			Name: "VCALENDAR",
+			Comps: []caldav.CompFilter{{
+				Name:  "VEVENT",
+				Start: from,
+				End:   to,
+			}},
+		},
+	}
+	objects, err := c.QueryCalendar(ctx, p.cfg.CalendarPath, query)
+	if err != nil {
+		return nil, fmt.Errorf("CalDAV-Abfrage fehlgeschlagen: %w", err)
+	}
+
+	var out []Interval
+	for _, obj := range objects {
+		if obj.Data == nil {
+			continue
+		}
+		for _, ev := range obj.Data.Events() {
+			if prop := ev.Props.Get(ical.PropStatus); prop != nil && strings.EqualFold(prop.Value, "CANCELLED") {
+				continue
+			}
+			// Transparente Termine ("Verfügbar") blockieren keine Zeit.
+			if prop := ev.Props.Get("TRANSP"); prop != nil && strings.EqualFold(prop.Value, "TRANSPARENT") {
+				continue
+			}
+			start, err := ev.DateTimeStart(time.UTC)
+			if err != nil {
+				continue
+			}
+			end, err := ev.DateTimeEnd(time.UTC)
+			if err != nil || !end.After(start) {
+				continue
+			}
+			out = append(out, Interval{Start: start, End: end})
+		}
+	}
+	return out, nil
+}
diff --git a/backend/internal/calendar/google.go b/backend/internal/calendar/google.go
new file mode 100644
index 0000000..f0680ca
--- /dev/null
+++ b/backend/internal/calendar/google.go
@@ -0,0 +1,151 @@
+package calendar
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"golang.org/x/oauth2"
+	"golang.org/x/oauth2/google"
+)
+
+// GoogleConnConfig ist der verschlüsselt gespeicherte Zustand einer
+// Google-Kalenderverbindung.
+type GoogleConnConfig struct {
+	Token      *oauth2.Token `json:"token"`
+	CalendarID string        `json:"calendar_id"`
+}
+
+// GoogleOAuthConfig baut die OAuth2-Konfiguration. Die FreeBusy-API von Google
+// liefert ausschließlich busy-Zeiträume – gar keine Termindetails.
+func GoogleOAuthConfig(clientID, clientSecret, redirectURL string) *oauth2.Config {
+	return &oauth2.Config{
+		ClientID:     clientID,
+		ClientSecret: clientSecret,
+		RedirectURL:  redirectURL,
+		Scopes:       []string{"https://www.googleapis.com/auth/calendar.readonly"},
+		Endpoint:     google.Endpoint,
+	}
+}
+
+type GoogleProvider struct {
+	conf         *oauth2.Config
+	cfg          GoogleConnConfig
+	onTokenSaved func(*oauth2.Token) // wird aufgerufen, wenn das Token erneuert wurde
+}
+
+func NewGoogleProvider(conf *oauth2.Config, cfg GoogleConnConfig, onTokenSaved func(*oauth2.Token)) *GoogleProvider {
+	return &GoogleProvider{conf: conf, cfg: cfg, onTokenSaved: onTokenSaved}
+}
+
+type googleFreeBusyRequest struct {
+	TimeMin string                          `json:"timeMin"`
+	TimeMax string                          `json:"timeMax"`
+	Items   []googleFreeBusyRequestItem     `json:"items"`
+}
+
+type googleFreeBusyRequestItem struct {
+	ID string `json:"id"`
+}
+
+type googleFreeBusyResponse struct {
+	Calendars map[string]struct {
+		Busy []struct {
+			Start time.Time `json:"start"`
+			End   time.Time `json:"end"`
+		} `json:"busy"`
+		Errors []struct {
+			Reason string `json:"reason"`
+		} `json:"errors"`
+	} `json:"calendars"`
+}
+
+func (p *GoogleProvider) FetchBusy(ctx context.Context, from, to time.Time) ([]Interval, error) {
+	ts := p.conf.TokenSource(ctx, p.cfg.Token)
+	tok, err := ts.Token()
+	if err != nil {
+		return nil, fmt.Errorf("Google-Zugriff ungültig (neu verbinden): %w", err)
+	}
+	if tok.AccessToken != p.cfg.Token.AccessToken {
+		saved := *tok
+		p.cfg.Token = &saved
+		if p.onTokenSaved != nil {
+			p.onTokenSaved(&saved)
+		}
+	}
+
+	body, err := json.Marshal(googleFreeBusyRequest{
+		TimeMin: from.UTC().Format(time.RFC3339),
+		TimeMax: to.UTC().Format(time.RFC3339),
+		Items:   []googleFreeBusyRequestItem{{ID: p.cfg.CalendarID}},
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	client := oauth2.NewClient(ctx, ts)
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
+		"https://www.googleapis.com/calendar/v3/freeBusy", bytes.NewReader(body))
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("Google FreeBusy-Anfrage fehlgeschlagen: %w", err)
+	}
+	defer resp.Body.Close()
+	raw, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("Google FreeBusy-Fehler (HTTP %d): %.200s", resp.StatusCode, string(raw))
+	}
+
+	var out googleFreeBusyResponse
+	if err := json.Unmarshal(raw, &out); err != nil {
+		return nil, fmt.Errorf("Google FreeBusy-Antwort unlesbar: %w", err)
+	}
+
+	cal, ok := out.Calendars[p.cfg.CalendarID]
+	if !ok {
+		return nil, fmt.Errorf("Google: Kalender %s nicht in Antwort", p.cfg.CalendarID)
+	}
+	if len(cal.Errors) > 0 {
+		return nil, fmt.Errorf("Google: %s", cal.Errors[0].Reason)
+	}
+	intervals := make([]Interval, 0, len(cal.Busy))
+	for _, b := range cal.Busy {
+		intervals = append(intervals, Interval{Start: b.Start, End: b.End})
+	}
+	return intervals, nil
+}
+
+// GooglePrimaryCalendar liefert ID und Namen des Primärkalenders – genutzt
+// direkt nach dem OAuth-Flow.
+func GooglePrimaryCalendar(ctx context.Context, client *http.Client) (id, summary string, err error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet,
+		"https://www.googleapis.com/calendar/v3/calendars/primary", nil)
+	if err != nil {
+		return "", "", err
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", "", err
+	}
+	defer resp.Body.Close()
+	raw, _ := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	if resp.StatusCode != http.StatusOK {
+		return "", "", fmt.Errorf("Google: Primärkalender nicht lesbar (HTTP %d): %.200s", resp.StatusCode, string(raw))
+	}
+	var cal struct {
+		ID      string `json:"id"`
+		Summary string `json:"summary"`
+	}
+	if err := json.Unmarshal(raw, &cal); err != nil {
+		return "", "", err
+	}
+	return cal.ID, cal.Summary, nil
+}
diff --git a/backend/internal/calendar/ics.go b/backend/internal/calendar/ics.go
new file mode 100644
index 0000000..98b294e
--- /dev/null
+++ b/backend/internal/calendar/ics.go
@@ -0,0 +1,270 @@
+package calendar
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// ICSConnConfig: Abo eines beliebigen Kalenders per ICS-/webcal-Link
+// (z. B. die "private Adresse im iCal-Format" von Google oder Outlook-Feeds).
+type ICSConnConfig struct {
+	URL string `json:"url"`
+}
+
+type ICSProvider struct {
+	URL string
+	// DefaultTZ wird für "floating" Zeiten (ohne TZID/UTC) genutzt,
+	// typischerweise die Zeitzone des Kalenderbesitzers.
+	DefaultTZ string
+}
+
+func NewICSProvider(cfg ICSConnConfig, defaultTZ string) *ICSProvider {
+	return &ICSProvider{URL: cfg.URL, DefaultTZ: defaultTZ}
+}
+
+type icsEvent struct {
+	start       time.Time
+	hasStart    bool
+	allDay      bool
+	end         time.Time
+	cancelled   bool
+	transparent bool
+}
+
+func (p *ICSProvider) FetchBusy(ctx context.Context, from, to time.Time) ([]Interval, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, p.URL, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("User-Agent", "WannPassts/1.0 (+calendar-sync)")
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("ICS-Link nicht abrufbar: %w", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("ICS-Link antwortet mit HTTP %d", resp.StatusCode)
+	}
+	raw, err := io.ReadAll(io.LimitReader(resp.Body, 10<<20))
+	if err != nil {
+		return nil, fmt.Errorf("ICS-Antwort nicht lesbar: %w", err)
+	}
+
+	defLoc := time.UTC
+	if p.DefaultTZ != "" {
+		if loc, err := time.LoadLocation(p.DefaultTZ); err == nil {
+			defLoc = loc
+		}
+	}
+
+	events := parseICS(string(raw), defLoc)
+	var out []Interval
+	for _, ev := range events {
+		if ev.cancelled || ev.transparent || !ev.hasStart {
+			continue
+		}
+		end := ev.end
+		if end.IsZero() || !end.After(ev.start) {
+			if ev.allDay {
+				end = ev.start.Add(24 * time.Hour)
+			} else {
+				continue
+			}
+		}
+		out = append(out, Interval{Start: ev.start, End: end})
+	}
+	return clampIntervals(out, from, to), nil
+}
+
+// parseICS liest VEVENTs aus ICS-Daten. Zeilen werden entfaltet (RFC 5545),
+// Parameter wie TZID/VALUE=DATE ausgewertet. Serientermine werden als ihre
+// Basis-Instanz übernommen – ICS-Abos sind damit der "best effort"-Weg,
+// CalDAV und Google expandieren Serien serverseitig korrekt.
+func parseICS(input string, defLoc *time.Location) []icsEvent {
+	input = strings.ReplaceAll(input, "\r\n", "\n")
+	rawLines := strings.Split(input, "\n")
+	lines := make([]string, 0, len(rawLines))
+	for _, l := range rawLines {
+		if strings.HasPrefix(l, " ") || strings.HasPrefix(l, "\t") {
+			if len(lines) > 0 {
+				lines[len(lines)-1] += l[1:]
+			}
+			continue
+		}
+		lines = append(lines, strings.TrimSuffix(l, "\r"))
+	}
+
+	var events []icsEvent
+	var cur *icsEvent
+	for _, line := range lines {
+		upper := strings.ToUpper(strings.TrimSpace(line))
+		switch {
+		case upper == "BEGIN:VEVENT":
+			cur = &icsEvent{}
+			continue
+		case upper == "END:VEVENT":
+			if cur != nil {
+				events = append(events, *cur)
+				cur = nil
+			}
+			continue
+		}
+		if cur == nil {
+			continue
+		}
+		name, params, value := splitICSLine(line)
+		switch name {
+		case "DTSTART":
+			if t, allDay, ok := parseICSDateTime(value, params, defLoc); ok {
+				cur.start, cur.hasStart, cur.allDay = t, true, allDay
+			}
+		case "DTEND":
+			if t, _, ok := parseICSDateTime(value, params, defLoc); ok {
+				cur.end = t
+			}
+		case "DURATION":
+			if cur.hasStart {
+				if d, ok := parseISODuration(value); ok {
+					cur.end = cur.start.Add(d)
+				}
+			}
+		case "STATUS":
+			if strings.EqualFold(value, "CANCELLED") {
+				cur.cancelled = true
+			}
+		case "TRANSP":
+			if strings.EqualFold(value, "TRANSPARENT") {
+				cur.transparent = true
+			}
+		}
+	}
+	return events
+}
+
+// splitICSLine zerlegt "NAME;PARAM=WERT;...:value" am ersten Doppelpunkt.
+func splitICSLine(line string) (name string, params map[string]string, value string) {
+	params = map[string]string{}
+	i := strings.IndexByte(line, ':')
+	if i == -1 {
+		return strings.ToUpper(strings.TrimSpace(line)), params, ""
+	}
+	head, value := line[:i], strings.TrimSpace(line[i+1:])
+	parts := strings.Split(head, ";")
+	name = strings.ToUpper(strings.TrimSpace(parts[0]))
+	for _, p := range parts[1:] {
+		if eq := strings.IndexByte(p, '='); eq > 0 {
+			key := strings.ToUpper(strings.TrimSpace(p[:eq]))
+			params[key] = strings.Trim(strings.TrimSpace(p[eq+1:]), `"`)
+		}
+	}
+	return name, params, value
+}
+
+func parseICSDateTime(value string, params map[string]string, defLoc *time.Location) (t time.Time, allDay, ok bool) {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return time.Time{}, false, false
+	}
+	if params["VALUE"] == "DATE" || (len(value) == 8 && allDigits(value)) {
+		y, err1 := strconv.Atoi(value[0:4])
+		m, err2 := strconv.Atoi(value[4:6])
+		d, err3 := strconv.Atoi(value[6:8])
+		if err1 != nil || err2 != nil || err3 != nil {
+			return time.Time{}, false, false
+		}
+		return time.Date(y, time.Month(m), d, 0, 0, 0, 0, defLoc), true, true
+	}
+	layouts := []struct {
+		layout string
+		utc    bool
+	}{
+		{"20060102T150405Z", true},
+		{"20060102T150405", false},
+		{"2006-01-02T15:04:05Z07:00", true},
+		{"2006-01-02T15:04:05", false},
+	}
+	for _, l := range layouts {
+		if parsed, err := time.Parse(l.layout, value); err == nil {
+			if l.utc {
+				return parsed.UTC(), false, true
+			}
+			// Wanduhrzeit in der Zielzone interpretieren (nicht instant-konvertieren)
+			loc := defLoc
+			if tzid := params["TZID"]; tzid != "" {
+				if loaded, err := time.LoadLocation(tzid); err == nil {
+					loc = loaded
+				}
+			}
+			y, mo, d := parsed.Date()
+			hh, mm, ss := parsed.Clock()
+			return time.Date(y, mo, d, hh, mm, ss, 0, loc), false, true
+		}
+	}
+	return time.Time{}, false, false
+}
+
+func allDigits(s string) bool {
+	for _, c := range s {
+		if c < '0' || c > '9' {
+			return false
+		}
+	}
+	return len(s) > 0
+}
+
+// parseISODuration versteht die üblichen ICS-Dauerformen: PT15M, PT1H30M,
+// P1D, P2W, PT45S …
+func parseISODuration(s string) (time.Duration, bool) {
+	s = strings.TrimSpace(strings.ToUpper(s))
+	if len(s) < 2 || s[0] != 'P' || strings.Contains(s, "-") {
+		return 0, false
+	}
+	body := s[1:]
+	if strings.HasSuffix(body, "W") {
+		v, err := strconv.ParseFloat(strings.TrimSuffix(body, "W"), 64)
+		if err != nil {
+			return 0, false
+		}
+		return time.Duration(v * float64(7*24*time.Hour)), true
+	}
+	if strings.HasPrefix(body, "T") {
+		body = body[1:]
+	}
+	units := map[byte]time.Duration{
+		'D': 24 * time.Hour,
+		'H': time.Hour,
+		'M': time.Minute,
+		'S': time.Second,
+	}
+	var total time.Duration
+	num := ""
+	flush := func(unit time.Duration) bool {
+		if num == "" {
+			return false
+		}
+		v, err := strconv.ParseFloat(num, 64)
+		if err != nil {
+			return false
+		}
+		total += time.Duration(v * float64(unit))
+		num = ""
+		return true
+	}
+	for i := 0; i < len(body); i++ {
+		c := body[i]
+		if (c >= '0' && c <= '9') || c == '.' {
+			num += string(c)
+			continue
+		}
+		unit, known := units[c]
+		if !known || !flush(unit) {
+			return 0, false
+		}
+	}
+	return total, num == ""
+}
diff --git a/backend/internal/calendar/ics_test.go b/backend/internal/calendar/ics_test.go
new file mode 100644
index 0000000..d013a78
--- /dev/null
+++ b/backend/internal/calendar/ics_test.go
@@ -0,0 +1,145 @@
+package calendar
+
+import (
+	"testing"
+	"time"
+)
+
+const sampleICS = `BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Test//EN
+BEGIN:VTIMEZONE
+TZID:Europe/Berlin
+BEGIN:STANDARD
+DTSTART:19701025T030000
+TZOFFSETFROM:+0200
+TZOFFSETTO:+0100
+END:STANDARD
+END:VTIMEZONE
+BEGIN:VEVENT
+UID:1
+DTSTART;TZID=Europe/Berlin:20260825T090000
+DTEND;TZID=Europe/Berlin:20260825T100000
+SUMMARY:Zahnarzt
+END:VEVENT
+BEGIN:VEVENT
+UID:2
+DTSTART:20260826T120000Z
+DURATION:PT45M
+SUMMARY:Call
+END:VEVENT
+BEGIN:VEVENT
+UID:3
+DTSTART;VALUE=DATE:20260827
+SUMMARY:Ganztägig
+END:VEVENT
+BEGIN:VEVENT
+UID:4
+DTSTART:20260828T080000Z
+DTEND:20260828T090000Z
+STATUS:CANCELLED
+SUMMARY:Abgesagt
+END:VEVENT
+BEGIN:VEVENT
+UID:5
+DTSTART:20260828T100000Z
+DTEND:20260828T110000Z
+TRANSP:TRANSPARENT
+SUMMARY:Verfügbar
+END:VEVENT
+BEGIN:VEVENT
+UID:6
+DTSTART:20260829T080000Z
+DTEND:202609
+ 01T080000Z
+SUMMARY:Gefaltet
+END:VEVENT
+END:VCALENDAR
+`
+
+func TestParseICS(t *testing.T) {
+	berlin, err := time.LoadLocation("Europe/Berlin")
+	if err != nil {
+		t.Fatal(err)
+	}
+	events := parseICS(sampleICS, berlin)
+	if len(events) != 6 {
+		t.Fatalf("6 Events erwartet, got %d", len(events))
+	}
+
+	// TZID-Event
+	if !events[0].start.Equal(time.Date(2026, 8, 25, 9, 0, 0, 0, berlin)) {
+		t.Errorf("TZID-Start falsch: %v", events[0].start)
+	}
+	if !events[0].end.Equal(time.Date(2026, 8, 25, 10, 0, 0, 0, berlin)) {
+		t.Errorf("TZID-Ende falsch: %v", events[0].end)
+	}
+
+	// UTC + DURATION
+	if !events[1].end.Equal(events[1].start.Add(45*time.Minute)) {
+		t.Errorf("DURATION nicht angewandt: %v", events[1].end)
+	}
+
+	// Ganztägig
+	if !events[2].allDay {
+		t.Error("VALUE=DATE nicht erkannt")
+	}
+
+	// Cancelled / Transparent markiert
+	if !events[3].cancelled {
+		t.Error("CANCELLED nicht erkannt")
+	}
+	if !events[4].transparent {
+		t.Error("TRANSPARENT nicht erkannt")
+	}
+
+	// Gefaltete Zeile (DTEND über zwei Zeilen)
+	if !events[5].end.Equal(time.Date(2026, 9, 1, 8, 0, 0, 0, time.UTC)) {
+		t.Errorf("Folding nicht aufgelöst, Ende: %v", events[5].end)
+	}
+}
+
+func TestParseISODuration(t *testing.T) {
+	cases := map[string]time.Duration{
+		"PT15M":  15 * time.Minute,
+		"PT1H30M": 90 * time.Minute,
+		"P1D":    24 * time.Hour,
+		"P2W":    14 * 24 * time.Hour,
+		"PT45S":  45 * time.Second,
+		"":       0,
+		"X":      0,
+		"P-1D":   0,
+	}
+	for in, want := range cases {
+		got, ok := parseISODuration(in)
+		if in == "" || in == "X" || in == "P-1D" {
+			if ok {
+				t.Errorf("%q sollte ungültig sein", in)
+			}
+			continue
+		}
+		if !ok || got != want {
+			t.Errorf("parseISODuration(%q) = %v (ok=%v), want %v", in, got, ok, want)
+		}
+	}
+}
+
+func TestClampIntervals(t *testing.T) {
+	from := time.Date(2026, 8, 25, 0, 0, 0, 0, time.UTC)
+	to := from.Add(48 * time.Hour)
+	in := []Interval{
+		{Start: from.Add(-2 * time.Hour), End: from.Add(time.Hour)},
+		{Start: from.Add(3 * time.Hour), End: from.Add(2 * time.Hour)}, // ungültig
+		{Start: from.Add(10 * time.Hour), End: to.Add(time.Hour)},
+	}
+	out := clampIntervals(in, from, to)
+	if len(out) != 2 {
+		t.Fatalf("2 Intervalle erwartet, got %d", len(out))
+	}
+	if !out[0].Start.Equal(from) || !out[0].End.Equal(from.Add(time.Hour)) {
+		t.Errorf("Intervall 1 nicht geklemmt: %v–%v", out[0].Start, out[0].End)
+	}
+	if !out[1].End.Equal(to) {
+		t.Errorf("Intervall 2 nicht geklemmt: %v", out[1].End)
+	}
+}
diff --git a/backend/internal/calendar/provider.go b/backend/internal/calendar/provider.go
new file mode 100644
index 0000000..dfcaa0c
--- /dev/null
+++ b/backend/internal/calendar/provider.go
@@ -0,0 +1,41 @@
+package calendar
+
+import (
+	"context"
+	"sort"
+	"time"
+)
+
+// Interval ist ein "beschäftigt"-Zeitraum. Enthält bewusst KEINE Termindetails,
+// nur Start und Ende – mehr verlässt den Kalender des Nutzers nie.
+type Interval struct {
+	Start time.Time
+	End   time.Time
+}
+
+type Provider interface {
+	// FetchBusy liefert alle busy-Zeiträume im Fenster [from, to).
+	FetchBusy(ctx context.Context, from, to time.Time) ([]Interval, error)
+}
+
+// clampIntervals schneidet Intervalle aufs Fenster zurecht, verwirft ungültige
+// und sortiert das Ergebnis.
+func clampIntervals(in []Interval, from, to time.Time) []Interval {
+	out := make([]Interval, 0, len(in))
+	for _, iv := range in {
+		if !iv.End.After(iv.Start) {
+			continue
+		}
+		if iv.Start.Before(from) {
+			iv.Start = from
+		}
+		if iv.End.After(to) {
+			iv.End = to
+		}
+		if iv.End.After(iv.Start) {
+			out = append(out, iv)
+		}
+	}
+	sort.Slice(out, func(i, j int) bool { return out[i].Start.Before(out[j].Start) })
+	return out
+}
diff --git a/backend/internal/calendar/sync.go b/backend/internal/calendar/sync.go
new file mode 100644
index 0000000..5274abd
--- /dev/null
+++ b/backend/internal/calendar/sync.go
@@ -0,0 +1,139 @@
+package calendar
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"strings"
+	"time"
+
+	"golang.org/x/oauth2"
+
+	"wannpassts/internal/config"
+	"wannpassts/internal/crypto"
+	"wannpassts/internal/db"
+)
+
+const syncStaleAfter = 5 * time.Minute
+
+type Syncer struct {
+	DB  *db.DB
+	Cfg *config.Config
+}
+
+// NeedsSync meldet, ob eine der Verbindungen älter als syncStaleAfter ist.
+func NeedsSync(conns []*db.Connection, now time.Time) bool {
+	for _, c := range conns {
+		if !c.LastSyncedTs.Valid || now.Unix()-c.LastSyncedTs.Int64 > int64(syncStaleAfter.Seconds()) {
+			return true
+		}
+	}
+	return false
+}
+
+// SyncUser aktualisiert die busy-Zeiträume aller Verbindungen eines Nutzers
+// für das Buchungsfenster [jetzt, jetzt+horizon]. Fehler einzelner Provider
+// werden pro Verbindung gespeichert und werfen den Gesamtsync nicht ab.
+func (s *Syncer) SyncUser(ctx context.Context, user *db.User) {
+	conns, err := s.DB.ConnectionsForUser(user.ID)
+	if err != nil {
+		log.Printf("sync: Verbindungen von User %d nicht lesbar: %v", user.ID, err)
+		return
+	}
+	if len(conns) == 0 {
+		return
+	}
+	from := time.Now().Add(-time.Hour)
+	to := time.Now().Add(time.Duration(user.HorizonDays) * 24 * time.Hour)
+
+	for _, conn := range conns {
+		s.syncConnection(ctx, conn, user, from, to)
+	}
+}
+
+func (s *Syncer) syncConnection(ctx context.Context, conn *db.Connection, user *db.User, from, to time.Time) {
+	prov, err := s.provider(conn)
+	if err != nil {
+		_ = s.DB.SetConnectionState(conn.ID, false, err.Error())
+		return
+	}
+	cctx, cancel := context.WithTimeout(ctx, 20*time.Second)
+	defer cancel()
+	busy, err := prov.FetchBusy(cctx, from, to)
+	if err != nil {
+		_ = s.DB.SetConnectionState(conn.ID, false, cleanErr(err.Error()))
+		return
+	}
+	slots := make([]db.BusySlot, 0, len(busy))
+	for _, iv := range busy {
+		slots = append(slots, db.BusySlot{StartTs: iv.Start.Unix(), EndTs: iv.End.Unix()})
+	}
+	if err := s.DB.ReplaceBusyForConnection(conn.ID, user.ID, slots); err != nil {
+		_ = s.DB.SetConnectionState(conn.ID, false, "Speichern fehlgeschlagen: "+err.Error())
+		return
+	}
+	_ = s.DB.SetConnectionState(conn.ID, true, "")
+}
+
+// SyncInBackground startet den Sync ohne den Aufrufer zu blocken.
+func (s *Syncer) SyncInBackground(user *db.User) {
+	go func() {
+		ctx, cancel := context.WithTimeout(context.Background(), 90*time.Second)
+		defer cancel()
+		s.SyncUser(ctx, user)
+	}()
+}
+
+func (s *Syncer) provider(conn *db.Connection) (Provider, error) {
+	plain, err := crypto.Decrypt(s.Cfg.EncryptionKey, conn.ConfigEnc)
+	if err != nil {
+		return nil, fmt.Errorf("gespeicherte Verbindung nicht entschlüsselbar (ENCRYPTION_KEY geändert?): %w", err)
+	}
+	switch conn.Provider {
+	case "google":
+		var cfg GoogleConnConfig
+		if err := json.Unmarshal(plain, &cfg); err != nil {
+			return nil, fmt.Errorf("Google-Konfiguration unlesbar: %w", err)
+		}
+		oconf := GoogleOAuthConfig(s.Cfg.GoogleClientID, s.Cfg.GoogleClientSecret,
+			s.Cfg.AppURL+"/api/calendars/google/callback")
+		calendarID := cfg.CalendarID
+		return NewGoogleProvider(oconf, cfg, func(t *oauth2.Token) {
+			s.saveGoogleToken(conn.ID, calendarID, t)
+		}), nil
+	case "caldav":
+		var cfg CalDAVConnConfig
+		if err := json.Unmarshal(plain, &cfg); err != nil {
+			return nil, fmt.Errorf("CalDAV-Konfiguration unlesbar: %w", err)
+		}
+		return NewCalDAVProvider(cfg), nil
+	case "ics":
+		var cfg ICSConnConfig
+		if err := json.Unmarshal(plain, &cfg); err != nil {
+			return nil, fmt.Errorf("ICS-Konfiguration unlesbar: %w", err)
+		}
+		return NewICSProvider(cfg, ""), nil
+	}
+	return nil, fmt.Errorf("unbekannter Provider %q", conn.Provider)
+}
+
+func (s *Syncer) saveGoogleToken(connID int64, calendarID string, t *oauth2.Token) {
+	data, err := json.Marshal(GoogleConnConfig{Token: t, CalendarID: calendarID})
+	if err != nil {
+		return
+	}
+	enc, err := crypto.Encrypt(s.Cfg.EncryptionKey, data)
+	if err != nil {
+		return
+	}
+	_ = s.DB.UpdateConnectionConfig(connID, enc)
+}
+
+func cleanErr(msg string) string {
+	msg = strings.TrimSpace(msg)
+	if len(msg) > 300 {
+		msg = msg[:300] + "…"
+	}
+	return msg
+}
diff --git a/backend/internal/config/config.go b/backend/internal/config/config.go
new file mode 100644
index 0000000..1f8f7e0
--- /dev/null
+++ b/backend/internal/config/config.go
@@ -0,0 +1,64 @@
+package config
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"log"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	Port               string
+	DBPath             string
+	AppURL             string
+	FrontendURL        string
+	JWTSecret          string
+	EncryptionKey      string
+	GoogleClientID     string
+	GoogleClientSecret string
+	StaticDir          string
+}
+
+// Load liest die Konfiguration aus Umgebungsvariablen (.env wird unterstützt).
+// Fehlende Secrets werden nur für die Entwicklung zufällig erzeugt.
+func Load() Config {
+	_ = godotenv.Load()
+
+	cfg := Config{
+		Port:               env("PORT", "8080"),
+		DBPath:             env("DB_PATH", "wannpassts.db"),
+		AppURL:             env("APP_URL", "http://localhost:8080"),
+		FrontendURL:        env("FRONTEND_URL", "http://localhost:5173"),
+		JWTSecret:          os.Getenv("JWT_SECRET"),
+		EncryptionKey:      os.Getenv("ENCRYPTION_KEY"),
+		GoogleClientID:     os.Getenv("GOOGLE_CLIENT_ID"),
+		GoogleClientSecret: os.Getenv("GOOGLE_CLIENT_SECRET"),
+		StaticDir:          env("STATIC_DIR", ""),
+	}
+	if cfg.JWTSecret == "" {
+		cfg.JWTSecret = randomHex(32)
+		log.Println("WARNUNG: JWT_SECRET nicht gesetzt – temporäres Secret erzeugt (Sessions verfallen bei Neustart).")
+	}
+	if cfg.EncryptionKey == "" {
+		cfg.EncryptionKey = randomHex(32)
+		log.Println("WARNUNG: ENCRYPTION_KEY nicht gesetzt – temporärer Schlüssel erzeugt (Kalender-Tokens verfallen bei Neustart).")
+	}
+	return cfg
+}
+
+func env(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
+
+func randomHex(n int) string {
+	b := make([]byte, n)
+	if _, err := rand.Read(b); err != nil {
+		log.Fatalf("Zufallszahl nicht verfügbar: %v", err)
+	}
+	return hex.EncodeToString(b)
+}
diff --git a/backend/internal/crypto/secret.go b/backend/internal/crypto/secret.go
new file mode 100644
index 0000000..1f60b71
--- /dev/null
+++ b/backend/internal/crypto/secret.go
@@ -0,0 +1,52 @@
+package crypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"errors"
+	"io"
+)
+
+// Encrypt verschlüsselt plaintext mit AES-256-GCM (Key = SHA256(secret))
+// und liefert base64(nonce + ciphertext).
+func Encrypt(secret string, plaintext []byte) (string, error) {
+	k := sha256.Sum256([]byte(secret))
+	block, err := aes.NewCipher(k[:])
+	if err != nil {
+		return "", err
+	}
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return "", err
+	}
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
+		return "", err
+	}
+	sealed := gcm.Seal(nonce, nonce, plaintext, nil)
+	return base64.StdEncoding.EncodeToString(sealed), nil
+}
+
+// Decrypt macht Encrypt rückgängig.
+func Decrypt(secret, s string) ([]byte, error) {
+	data, err := base64.StdEncoding.DecodeString(s)
+	if err != nil {
+		return nil, err
+	}
+	k := sha256.Sum256([]byte(secret))
+	block, err := aes.NewCipher(k[:])
+	if err != nil {
+		return nil, err
+	}
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+	if len(data) < gcm.NonceSize() {
+		return nil, errors.New("ciphertext zu kurz")
+	}
+	return gcm.Open(nil, data[:gcm.NonceSize()], data[gcm.NonceSize():], nil)
+}
diff --git a/backend/internal/db/db.go b/backend/internal/db/db.go
new file mode 100644
index 0000000..ddb6d02
--- /dev/null
+++ b/backend/internal/db/db.go
@@ -0,0 +1,354 @@
+package db
+
+import (
+	"database/sql"
+	"errors"
+	"time"
+
+	_ "modernc.org/sqlite"
+)
+
+var ErrNotFound = errors.New("nicht gefunden")
+
+type DB struct {
+	*sql.DB
+}
+
+type User struct {
+	ID           int64
+	Email        string
+	Name         string
+	PasswordHash string
+	Slug         string
+	Timezone     string
+	SlotMinutes  int
+	DayStartMin  int
+	DayEndMin    int
+	HorizonDays  int
+	Durations    string
+	Weekdays     string
+	CreatedTs    int64
+}
+
+type Connection struct {
+	ID           int64
+	UserID       int64
+	Provider     string // google | caldav | ics
+	DisplayName  string
+	ConfigEnc    string
+	LastSyncedTs sql.NullInt64
+	LastError    sql.NullString
+	CreatedTs    int64
+}
+
+type BusySlot struct {
+	ID           int64
+	UserID       int64
+	ConnectionID sql.NullInt64
+	StartTs      int64
+	EndTs        int64
+	BookingID    sql.NullInt64
+}
+
+type Booking struct {
+	ID             int64
+	UserID         int64
+	StartTs        int64
+	EndTs          int64
+	RequesterName  string
+	RequesterEmail string
+	Message        string
+	Status         string // pending | accepted | declined
+	CreatedTs      int64
+}
+
+func Open(path string) (*DB, error) {
+	d, err := sql.Open("sqlite", "file:"+path+"?_pragma=busy_timeout(5000)&_pragma=journal_mode(WAL)&_pragma=foreign_keys(1)")
+	if err != nil {
+		return nil, err
+	}
+	// SQLite verträgt parallele Writer nicht gut – ein Writer reicht hier.
+	d.SetMaxOpenConns(1)
+	if err := d.Ping(); err != nil {
+		return nil, err
+	}
+	dbase := &DB{d}
+	if err := dbase.migrate(); err != nil {
+		return nil, err
+	}
+	return dbase, nil
+}
+
+func (d *DB) migrate() error {
+	stmts := []string{
+		`CREATE TABLE IF NOT EXISTS users (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			email TEXT NOT NULL UNIQUE,
+			name TEXT NOT NULL,
+			password_hash TEXT NOT NULL,
+			slug TEXT NOT NULL UNIQUE,
+			timezone TEXT NOT NULL DEFAULT 'Europe/Berlin',
+			slot_minutes INTEGER NOT NULL DEFAULT 30,
+			day_start_min INTEGER NOT NULL DEFAULT 540,
+			day_end_min INTEGER NOT NULL DEFAULT 1080,
+			horizon_days INTEGER NOT NULL DEFAULT 21,
+			durations TEXT NOT NULL DEFAULT '15,30,60,120',
+			weekdays TEXT NOT NULL DEFAULT '1,2,3,4,5',
+			created_ts INTEGER NOT NULL
+		)`,
+		`CREATE TABLE IF NOT EXISTS calendar_connections (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+			provider TEXT NOT NULL,
+			display_name TEXT NOT NULL,
+			config_enc TEXT NOT NULL,
+			last_synced_ts INTEGER,
+			last_error TEXT,
+			created_ts INTEGER NOT NULL
+		)`,
+		`CREATE TABLE IF NOT EXISTS busy_slots (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+			connection_id INTEGER REFERENCES calendar_connections(id) ON DELETE CASCADE,
+			booking_id INTEGER,
+			start_ts INTEGER NOT NULL,
+			end_ts INTEGER NOT NULL
+		)`,
+		`CREATE INDEX IF NOT EXISTS idx_busy_user_time ON busy_slots(user_id, start_ts)`,
+		`CREATE INDEX IF NOT EXISTS idx_busy_booking ON busy_slots(booking_id)`,
+		`CREATE TABLE IF NOT EXISTS booking_requests (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+			start_ts INTEGER NOT NULL,
+			end_ts INTEGER NOT NULL,
+			requester_name TEXT NOT NULL,
+			requester_email TEXT NOT NULL,
+			message TEXT NOT NULL DEFAULT '',
+			status TEXT NOT NULL DEFAULT 'pending',
+			created_ts INTEGER NOT NULL
+		)`,
+		`CREATE INDEX IF NOT EXISTS idx_bookings_user ON booking_requests(user_id, created_ts)`,
+	}
+	for _, s := range stmts {
+		if _, err := d.Exec(s); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// --- Users ---
+
+func (d *DB) CreateUser(u *User) error {
+	return d.QueryRow(
+		`INSERT INTO users (email, name, password_hash, slug, timezone, created_ts)
+		 VALUES (?, ?, ?, ?, ?, ?) RETURNING id`,
+		u.Email, u.Name, u.PasswordHash, u.Slug, u.Timezone, time.Now().Unix(),
+	).Scan(&u.ID)
+}
+
+const userCols = `id, email, name, password_hash, slug, timezone, slot_minutes, day_start_min, day_end_min, horizon_days, durations, weekdays, created_ts`
+
+func scanUser(row interface{ Scan(...any) error }) (*User, error) {
+	u := &User{}
+	err := row.Scan(&u.ID, &u.Email, &u.Name, &u.PasswordHash, &u.Slug, &u.Timezone,
+		&u.SlotMinutes, &u.DayStartMin, &u.DayEndMin, &u.HorizonDays, &u.Durations, &u.Weekdays, &u.CreatedTs)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	return u, nil
+}
+
+func (d *DB) UserByEmail(email string) (*User, error) {
+	return scanUser(d.QueryRow(`SELECT `+userCols+` FROM users WHERE email = ?`, email))
+}
+
+func (d *DB) UserByID(id int64) (*User, error) {
+	return scanUser(d.QueryRow(`SELECT `+userCols+` FROM users WHERE id = ?`, id))
+}
+
+func (d *DB) UserBySlug(slug string) (*User, error) {
+	return scanUser(d.QueryRow(`SELECT `+userCols+` FROM users WHERE slug = ?`, slug))
+}
+
+func (d *DB) SlugExists(slug string) (bool, error) {
+	var one int
+	err := d.QueryRow(`SELECT 1 FROM users WHERE slug = ?`, slug).Scan(&one)
+	if errors.Is(err, sql.ErrNoRows) {
+		return false, nil
+	}
+	return err == nil, err
+}
+
+func (d *DB) UpdateUserSettings(u *User) error {
+	_, err := d.Exec(`UPDATE users SET name=?, timezone=?, slot_minutes=?, day_start_min=?, day_end_min=?, horizon_days=?, durations=?, weekdays=? WHERE id=?`,
+		u.Name, u.Timezone, u.SlotMinutes, u.DayStartMin, u.DayEndMin, u.HorizonDays, u.Durations, u.Weekdays, u.ID)
+	return err
+}
+
+func (d *DB) UpdateUserSlug(id int64, slug string) error {
+	_, err := d.Exec(`UPDATE users SET slug=? WHERE id=?`, slug, id)
+	return err
+}
+
+// --- Connections ---
+
+func (d *DB) CreateConnection(userID int64, provider, displayName, configEnc string) (int64, error) {
+	var id int64
+	err := d.QueryRow(
+		`INSERT INTO calendar_connections (user_id, provider, display_name, config_enc, created_ts)
+		 VALUES (?, ?, ?, ?, ?) RETURNING id`,
+		userID, provider, displayName, configEnc, time.Now().Unix(),
+	).Scan(&id)
+	return id, err
+}
+
+const connCols = `id, user_id, provider, display_name, config_enc, last_synced_ts, last_error, created_ts`
+
+func (d *DB) ConnectionsForUser(userID int64) ([]*Connection, error) {
+	rows, err := d.Query(`SELECT `+connCols+` FROM calendar_connections WHERE user_id = ? ORDER BY created_ts`, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []*Connection
+	for rows.Next() {
+		c := &Connection{}
+		if err := rows.Scan(&c.ID, &c.UserID, &c.Provider, &c.DisplayName, &c.ConfigEnc, &c.LastSyncedTs, &c.LastError, &c.CreatedTs); err != nil {
+			return nil, err
+		}
+		out = append(out, c)
+	}
+	return out, rows.Err()
+}
+
+func (d *DB) ConnectionByID(id, userID int64) (*Connection, error) {
+	c := &Connection{}
+	err := d.QueryRow(`SELECT `+connCols+` FROM calendar_connections WHERE id = ? AND user_id = ?`, id, userID).
+		Scan(&c.ID, &c.UserID, &c.Provider, &c.DisplayName, &c.ConfigEnc, &c.LastSyncedTs, &c.LastError, &c.CreatedTs)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+func (d *DB) DeleteConnection(id, userID int64) error {
+	_, err := d.Exec(`DELETE FROM calendar_connections WHERE id = ? AND user_id = ?`, id, userID)
+	return err
+}
+
+func (d *DB) SetConnectionState(id int64, synced bool, errMsg string) error {
+	var syncedTs any
+	if synced {
+		syncedTs = time.Now().Unix()
+	}
+	_, err := d.Exec(`UPDATE calendar_connections SET last_synced_ts = ?, last_error = ? WHERE id = ?`, syncedTs, errMsg, id)
+	return err
+}
+
+func (d *DB) UpdateConnectionConfig(id int64, configEnc string) error {
+	_, err := d.Exec(`UPDATE calendar_connections SET config_enc = ? WHERE id = ?`, configEnc, id)
+	return err
+}
+
+// --- Busy slots ---
+
+func (d *DB) ReplaceBusyForConnection(connID, userID int64, slots []BusySlot) error {
+	tx, err := d.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+	if _, err := tx.Exec(`DELETE FROM busy_slots WHERE connection_id = ?`, connID); err != nil {
+		return err
+	}
+	for _, s := range slots {
+		if _, err := tx.Exec(`INSERT INTO busy_slots (user_id, connection_id, start_ts, end_ts) VALUES (?, ?, ?, ?)`,
+			userID, connID, s.StartTs, s.EndTs); err != nil {
+			return err
+		}
+	}
+	return tx.Commit()
+}
+
+func (d *DB) BusyForUser(userID, fromTs, toTs int64) ([]BusySlot, error) {
+	rows, err := d.Query(`SELECT id, user_id, connection_id, start_ts, end_ts, booking_id FROM busy_slots
+		WHERE user_id = ? AND end_ts > ? AND start_ts < ? ORDER BY start_ts`, userID, fromTs, toTs)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []BusySlot
+	for rows.Next() {
+		var s BusySlot
+		if err := rows.Scan(&s.ID, &s.UserID, &s.ConnectionID, &s.StartTs, &s.EndTs, &s.BookingID); err != nil {
+			return nil, err
+		}
+		out = append(out, s)
+	}
+	return out, rows.Err()
+}
+
+// --- Bookings ---
+
+func (d *DB) CreateBooking(b *Booking) error {
+	return d.QueryRow(
+		`INSERT INTO booking_requests (user_id, start_ts, end_ts, requester_name, requester_email, message, status, created_ts)
+		 VALUES (?, ?, ?, ?, ?, ?, 'pending', ?) RETURNING id`,
+		b.UserID, b.StartTs, b.EndTs, b.RequesterName, b.RequesterEmail, b.Message, time.Now().Unix(),
+	).Scan(&b.ID)
+}
+
+const bookingCols = `id, user_id, start_ts, end_ts, requester_name, requester_email, message, status, created_ts`
+
+func (d *DB) BookingsForUser(userID int64) ([]*Booking, error) {
+	rows, err := d.Query(`SELECT `+bookingCols+` FROM booking_requests WHERE user_id = ? ORDER BY (status='pending') DESC, start_ts ASC`, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []*Booking
+	for rows.Next() {
+		b := &Booking{}
+		if err := rows.Scan(&b.ID, &b.UserID, &b.StartTs, &b.EndTs, &b.RequesterName, &b.RequesterEmail, &b.Message, &b.Status, &b.CreatedTs); err != nil {
+			return nil, err
+		}
+		out = append(out, b)
+	}
+	return out, rows.Err()
+}
+
+func (d *DB) BookingByID(id, userID int64) (*Booking, error) {
+	b := &Booking{}
+	err := d.QueryRow(`SELECT `+bookingCols+` FROM booking_requests WHERE id = ? AND user_id = ?`, id, userID).
+		Scan(&b.ID, &b.UserID, &b.StartTs, &b.EndTs, &b.RequesterName, &b.RequesterEmail, &b.Message, &b.Status, &b.CreatedTs)
+	if errors.Is(err, sql.ErrNoRows) {
+		return nil, ErrNotFound
+	}
+	if err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+func (d *DB) SetBookingStatus(id int64, status string) error {
+	_, err := d.Exec(`UPDATE booking_requests SET status = ? WHERE id = ?`, status, id)
+	return err
+}
+
+func (d *DB) InsertBusyForBooking(b *Booking) error {
+	_, err := d.Exec(`INSERT INTO busy_slots (user_id, booking_id, start_ts, end_ts) VALUES (?, ?, ?, ?)`,
+		b.UserID, b.ID, b.StartTs, b.EndTs)
+	return err
+}
+
+func (d *DB) DeleteBusyByBooking(bookingID int64) error {
+	_, err := d.Exec(`DELETE FROM busy_slots WHERE booking_id = ?`, bookingID)
+	return err
+}
diff --git a/backend/internal/httpapi/auth.go b/backend/internal/httpapi/auth.go
new file mode 100644
index 0000000..6ee7ea5
--- /dev/null
+++ b/backend/internal/httpapi/auth.go
@@ -0,0 +1,289 @@
+package httpapi
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"net/http"
+	"strings"
+	"time"
+
+	"golang.org/x/crypto/bcrypt"
+
+	"wannpassts/internal/db"
+)
+
+const tokenTTL = 7 * 24 * time.Hour
+
+func (s *Server) Register(w http.ResponseWriter, r *http.Request) {
+	var in struct {
+		Email    string `json:"email"`
+		Password string `json:"password"`
+		Name     string `json:"name"`
+		Timezone string `json:"timezone"`
+	}
+	if err := decodeBody(r, &in); err != nil {
+		jsonError(w, http.StatusBadRequest, "Anfrage unlesbar")
+		return
+	}
+	in.Email = strings.ToLower(strings.TrimSpace(in.Email))
+	in.Name = strings.TrimSpace(in.Name)
+	if !validEmail(in.Email) {
+		jsonError(w, http.StatusBadRequest, "Bitte eine gültige E-Mail-Adresse angeben")
+		return
+	}
+	if len(in.Password) < 8 || len(in.Password) > 200 {
+		jsonError(w, http.StatusBadRequest, "Das Passwort muss 8–200 Zeichen lang sein")
+		return
+	}
+	if in.Name == "" || len(in.Name) > 80 {
+		jsonError(w, http.StatusBadRequest, "Bitte einen Namen (max. 80 Zeichen) angeben")
+		return
+	}
+	tz := in.Timezone
+	if tz == "" {
+		tz = "Europe/Berlin"
+	}
+	if _, err := time.LoadLocation(tz); err != nil {
+		jsonError(w, http.StatusBadRequest, "Unbekannte Zeitzone")
+		return
+	}
+	if _, err := s.DB.UserByEmail(in.Email); err == nil {
+		jsonError(w, http.StatusConflict, "Diese E-Mail-Adresse ist bereits registriert")
+		return
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(in.Password), 10)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Passwort konnte nicht verarbeitet werden")
+		return
+	}
+	slug, err := s.uniqueSlug()
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Interner Fehler")
+		return
+	}
+	u := &db.User{Email: in.Email, Name: in.Name, PasswordHash: string(hash), Slug: slug, Timezone: tz}
+	if err := s.DB.CreateUser(u); err != nil {
+		jsonError(w, http.StatusInternalServerError, "Konto konnte nicht erstellt werden")
+		return
+	}
+	token, err := s.signJWT(u.ID, tokenTTL)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Token konnte nicht erzeugt werden")
+		return
+	}
+	writeJSON(w, http.StatusCreated, map[string]any{"token": token, "user": userToJSON(u)})
+}
+
+func (s *Server) Login(w http.ResponseWriter, r *http.Request) {
+	var in struct {
+		Email    string `json:"email"`
+		Password string `json:"password"`
+	}
+	if err := decodeBody(r, &in); err != nil {
+		jsonError(w, http.StatusBadRequest, "Anfrage unlesbar")
+		return
+	}
+	u, err := s.DB.UserByEmail(strings.ToLower(strings.TrimSpace(in.Email)))
+	if err != nil {
+		jsonError(w, http.StatusUnauthorized, "E-Mail oder Passwort falsch")
+		return
+	}
+	if bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(in.Password)) != nil {
+		jsonError(w, http.StatusUnauthorized, "E-Mail oder Passwort falsch")
+		return
+	}
+	token, err := s.signJWT(u.ID, tokenTTL)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Token konnte nicht erzeugt werden")
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"token": token, "user": userToJSON(u)})
+}
+
+func (s *Server) Me(w http.ResponseWriter, r *http.Request) {
+	writeJSON(w, http.StatusOK, map[string]any{"user": userToJSON(userFrom(r))})
+}
+
+func (s *Server) UpdateMe(w http.ResponseWriter, r *http.Request) {
+	u := userFrom(r)
+	var in struct {
+		Name        *string `json:"name"`
+		Timezone    *string `json:"timezone"`
+		SlotMinutes *int    `json:"slot_minutes"`
+		DayStartMin *int    `json:"day_start_min"`
+		DayEndMin   *int    `json:"day_end_min"`
+		HorizonDays *int    `json:"horizon_days"`
+		Durations   []int   `json:"durations"`
+		Weekdays    []int   `json:"weekdays"`
+	}
+	if err := decodeBody(r, &in); err != nil {
+		jsonError(w, http.StatusBadRequest, "Anfrage unlesbar")
+		return
+	}
+	if in.Name != nil {
+		name := strings.TrimSpace(*in.Name)
+		if name == "" || len(name) > 80 {
+			jsonError(w, http.StatusBadRequest, "Name muss 1–80 Zeichen haben")
+			return
+		}
+		u.Name = name
+	}
+	if in.Timezone != nil {
+		if _, err := time.LoadLocation(*in.Timezone); err != nil {
+			jsonError(w, http.StatusBadRequest, "Unbekannte Zeitzone")
+			return
+		}
+		u.Timezone = *in.Timezone
+	}
+	if in.SlotMinutes != nil {
+		if *in.SlotMinutes < 5 || *in.SlotMinutes > 180 {
+			jsonError(w, http.StatusBadRequest, "Slot-Größe muss 5–180 Minuten sein")
+			return
+		}
+		u.SlotMinutes = *in.SlotMinutes
+	}
+	if in.DayStartMin != nil {
+		if *in.DayStartMin < 0 || *in.DayStartMin > 1439 {
+			jsonError(w, http.StatusBadRequest, "Tagesbeginn ungültig")
+			return
+		}
+		u.DayStartMin = *in.DayStartMin
+	}
+	if in.DayEndMin != nil {
+		if *in.DayEndMin < 1 || *in.DayEndMin > 1440 {
+			jsonError(w, http.StatusBadRequest, "Tagesende ungültig")
+			return
+		}
+		u.DayEndMin = *in.DayEndMin
+	}
+	if u.DayStartMin >= u.DayEndMin {
+		jsonError(w, http.StatusBadRequest, "Tagesbeginn muss vor dem Tagesende liegen")
+		return
+	}
+	if in.HorizonDays != nil {
+		if *in.HorizonDays < 1 || *in.HorizonDays > 120 {
+			jsonError(w, http.StatusBadRequest, "Buchungshorizont muss 1–120 Tage sein")
+			return
+		}
+		u.HorizonDays = *in.HorizonDays
+	}
+	if in.Durations != nil {
+		durations, err := cleanDurations(in.Durations)
+		if err != nil {
+			jsonError(w, http.StatusBadRequest, err.Error())
+			return
+		}
+		u.Durations = intsCSV(durations)
+	}
+	if in.Weekdays != nil {
+		weekdays, err := cleanWeekdays(in.Weekdays)
+		if err != nil {
+			jsonError(w, http.StatusBadRequest, err.Error())
+			return
+		}
+		u.Weekdays = intsCSV(weekdays)
+	}
+	if err := s.DB.UpdateUserSettings(u); err != nil {
+		jsonError(w, http.StatusInternalServerError, "Speichern fehlgeschlagen")
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{"user": userToJSON(u)})
+}
+
+func (s *Server) RegenSlug(w http.ResponseWriter, r *http.Request) {
+	u := userFrom(r)
+	slug, err := s.uniqueSlug()
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Interner Fehler")
+		return
+	}
+	if err := s.DB.UpdateUserSlug(u.ID, slug); err != nil {
+		jsonError(w, http.StatusInternalServerError, "Speichern fehlgeschlagen")
+		return
+	}
+	u.Slug = slug
+	writeJSON(w, http.StatusOK, map[string]any{"user": userToJSON(u)})
+}
+
+func (s *Server) uniqueSlug() (string, error) {
+	for i := 0; i < 8; i++ {
+		b := make([]byte, 9)
+		if _, err := rand.Read(b); err != nil {
+			return "", err
+		}
+		slug := base64.RawURLEncoding.EncodeToString(b)
+		exists, err := s.DB.SlugExists(slug)
+		if err != nil {
+			return "", err
+		}
+		if !exists {
+			return slug, nil
+		}
+	}
+	return "", http.ErrBodyNotAllowed
+}
+
+func validEmail(s string) bool {
+	if len(s) < 5 || len(s) > 254 || strings.Count(s, "@") != 1 {
+		return false
+	}
+	at := strings.IndexByte(s, '@')
+	local, domain := s[:at], s[at+1:]
+	if local == "" || !strings.Contains(domain, ".") || strings.HasPrefix(domain, ".") || strings.HasSuffix(domain, ".") {
+		return false
+	}
+	return !strings.ContainsAny(s, " \t")
+}
+
+func cleanDurations(list []int) ([]int, error) {
+	if len(list) == 0 || len(list) > 8 {
+		return nil, errNew("1–8 Dauerangaben benötigt")
+	}
+	seen := map[int]bool{}
+	var out []int
+	for _, v := range list {
+		if v < 5 || v > 480 {
+			return nil, errNew("Dauern müssen 5–480 Minuten sein")
+		}
+		if !seen[v] {
+			seen[v] = true
+			out = append(out, v)
+		}
+	}
+	for i := 1; i < len(out); i++ {
+		for j := i; j > 0 && out[j] < out[j-1]; j-- {
+			out[j], out[j-1] = out[j-1], out[j]
+		}
+	}
+	return out, nil
+}
+
+func cleanWeekdays(list []int) ([]int, error) {
+	if len(list) == 0 || len(list) > 7 {
+		return nil, errNew("Mindestens ein Buchungstag nötig")
+	}
+	seen := map[int]bool{}
+	var out []int
+	for _, v := range list {
+		if v < 1 || v > 7 {
+			return nil, errNew("Wochentage müssen 1 (Mo) – 7 (So) sein")
+		}
+		if !seen[v] {
+			seen[v] = true
+			out = append(out, v)
+		}
+	}
+	for i := 1; i < len(out); i++ {
+		for j := i; j > 0 && out[j] < out[j-1]; j-- {
+			out[j], out[j-1] = out[j-1], out[j]
+		}
+	}
+	return out, nil
+}
+
+func errNew(msg string) error { return &simpleError{msg} }
+
+type simpleError struct{ msg string }
+
+func (e *simpleError) Error() string { return e.msg }
diff --git a/backend/internal/httpapi/bookings.go b/backend/internal/httpapi/bookings.go
new file mode 100644
index 0000000..7536515
--- /dev/null
+++ b/backend/internal/httpapi/bookings.go
@@ -0,0 +1,93 @@
+package httpapi
+
+import (
+	"net/http"
+)
+
+func (s *Server) ListBookings(w http.ResponseWriter, r *http.Request) {
+	bookings, err := s.DB.BookingsForUser(userFrom(r).ID)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Anfragen nicht lesbar")
+		return
+	}
+	out := make([]BookingJSON, 0, len(bookings))
+	for _, b := range bookings {
+		out = append(out, bookingToJSON(b))
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+func (s *Server) AcceptBooking(w http.ResponseWriter, r *http.Request) {
+	user := userFrom(r)
+	id, err := pathID(r)
+	if err != nil {
+		jsonError(w, http.StatusBadRequest, "Ungültige ID")
+		return
+	}
+	booking, err := s.DB.BookingByID(id, user.ID)
+	if err != nil {
+		jsonError(w, http.StatusNotFound, "Anfrage nicht gefunden")
+		return
+	}
+	if booking.Status != "pending" {
+		jsonError(w, http.StatusConflict, "Diese Anfrage wurde bereits bearbeitet")
+		return
+	}
+	// Kollision mit bestehenden busy-Zeiträumen prüfen (angommene Buchungen
+	// und Kalendertermine liegen beide in busy_slots).
+	busy, err := s.DB.BusyForUser(user.ID, booking.StartTs-1, booking.EndTs+1)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Belegung nicht prüfbar")
+		return
+	}
+	for _, b := range busy {
+		if b.BookingID.Valid && b.BookingID.Int64 == booking.ID {
+			continue
+		}
+		if b.StartTs < booking.EndTs && booking.StartTs < b.EndTs {
+			jsonError(w, http.StatusConflict, "Der Zeitraum kollidiert inzwischen mit einem anderen Termin")
+			return
+		}
+	}
+	if err := s.DB.InsertBusyForBooking(booking); err != nil {
+		jsonError(w, http.StatusInternalServerError, "Termin konnte nicht eingetragen werden")
+		return
+	}
+	if err := s.DB.SetBookingStatus(booking.ID, "accepted"); err != nil {
+		jsonError(w, http.StatusInternalServerError, "Status konnte nicht gespeichert werden")
+		return
+	}
+	booking.Status = "accepted"
+	writeJSON(w, http.StatusOK, bookingToJSON(booking))
+}
+
+func (s *Server) DeclineBooking(w http.ResponseWriter, r *http.Request) {
+	user := userFrom(r)
+	id, err := pathID(r)
+	if err != nil {
+		jsonError(w, http.StatusBadRequest, "Ungültige ID")
+		return
+	}
+	booking, err := s.DB.BookingByID(id, user.ID)
+	if err != nil {
+		jsonError(w, http.StatusNotFound, "Anfrage nicht gefunden")
+		return
+	}
+	if booking.Status == "pending" {
+		if err := s.DB.SetBookingStatus(booking.ID, "declined"); err != nil {
+			jsonError(w, http.StatusInternalServerError, "Status konnte nicht gespeichert werden")
+			return
+		}
+	} else if booking.Status == "accepted" {
+		if err := s.DB.DeleteBusyByBooking(booking.ID); err != nil {
+			jsonError(w, http.StatusInternalServerError, "Termin konnte nicht entfernt werden")
+			return
+		}
+		if err := s.DB.SetBookingStatus(booking.ID, "declined"); err != nil {
+			jsonError(w, http.StatusInternalServerError, "Status konnte nicht gespeichert werden")
+			return
+		}
+	}
+	booking.Status = "declined"
+	writeJSON(w, http.StatusOK, bookingToJSON(booking))
+}
diff --git a/backend/internal/httpapi/calendars.go b/backend/internal/httpapi/calendars.go
new file mode 100644
index 0000000..41d4c4c
--- /dev/null
+++ b/backend/internal/httpapi/calendars.go
@@ -0,0 +1,247 @@
+package httpapi
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"golang.org/x/oauth2"
+
+	"wannpassts/internal/calendar"
+	"wannpassts/internal/crypto"
+)
+
+func (s *Server) ListCalendars(w http.ResponseWriter, r *http.Request) {
+	conns, err := s.DB.ConnectionsForUser(userFrom(r).ID)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Verbindungen nicht lesbar")
+		return
+	}
+	out := make([]ConnectionJSON, 0, len(conns))
+	for _, c := range conns {
+		out = append(out, connToJSON(c))
+	}
+	writeJSON(w, http.StatusOK, out)
+}
+
+func (s *Server) DeleteCalendar(w http.ResponseWriter, r *http.Request) {
+	id, err := pathID(r)
+	if err != nil {
+		jsonError(w, http.StatusBadRequest, "Ungültige ID")
+		return
+	}
+	if err := s.DB.DeleteConnection(id, userFrom(r).ID); err != nil {
+		jsonError(w, http.StatusInternalServerError, "Löschen fehlgeschlagen")
+		return
+	}
+	writeJSON(w, http.StatusOK, nil)
+}
+
+func (s *Server) ConnectCalDAV(w http.ResponseWriter, r *http.Request) {
+	user := userFrom(r)
+	var in struct {
+		ServerURL    string `json:"server_url"`
+		Username     string `json:"username"`
+		Password     string `json:"password"`
+		CalendarPath string `json:"calendar_path"`
+		DisplayName  string `json:"display_name"`
+	}
+	if err := decodeBody(r, &in); err != nil {
+		jsonError(w, http.StatusBadRequest, "Anfrage unlesbar")
+		return
+	}
+	in.ServerURL = strings.TrimSuffix(strings.TrimSpace(in.ServerURL), "/")
+	if !strings.HasPrefix(in.ServerURL, "http://") && !strings.HasPrefix(in.ServerURL, "https://") {
+		jsonError(w, http.StatusBadRequest, "Server-URL muss mit http:// oder https:// beginnen")
+		return
+	}
+	if in.Username == "" || in.Password == "" {
+		jsonError(w, http.StatusBadRequest, "Benutzername und Passwort werden benötigt (iCloud: App-spezifisches Passwort)")
+		return
+	}
+
+	cfg := calendar.CalDAVConnConfig{
+		ServerURL:    in.ServerURL,
+		Username:     in.Username,
+		Password:     in.Password,
+		CalendarPath: strings.TrimSpace(in.CalendarPath),
+	}
+	if cfg.CalendarPath == "" {
+		ctx, cancel := context.WithTimeout(r.Context(), 25*time.Second)
+		defer cancel()
+		path, name, err := calendar.DiscoverCalDAV(ctx, cfg)
+		if err != nil {
+			jsonError(w, http.StatusBadRequest, err.Error())
+			return
+		}
+		cfg.CalendarPath = path
+		if in.DisplayName == "" {
+			in.DisplayName = name
+		}
+	}
+	if in.DisplayName == "" {
+		if u, err := url.Parse(in.ServerURL); err == nil {
+			in.DisplayName = u.Host
+		} else {
+			in.DisplayName = "CalDAV-Kalender"
+		}
+	}
+
+	enc, err := s.encryptConfig(cfg)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Speichern fehlgeschlagen")
+		return
+	}
+	id, err := s.DB.CreateConnection(user.ID, "caldav", in.DisplayName, enc)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Verbindung konnte nicht gespeichert werden")
+		return
+	}
+	s.Syncer.SyncInBackground(user)
+	writeJSON(w, http.StatusCreated, ConnectionJSON{ID: id, Provider: "caldav", DisplayName: in.DisplayName, CreatedTs: time.Now().Unix()})
+}
+
+func (s *Server) ConnectICS(w http.ResponseWriter, r *http.Request) {
+	user := userFrom(r)
+	var in struct {
+		URL         string `json:"url"`
+		DisplayName string `json:"display_name"`
+	}
+	if err := decodeBody(r, &in); err != nil {
+		jsonError(w, http.StatusBadRequest, "Anfrage unlesbar")
+		return
+	}
+	rawURL := strings.TrimSpace(in.URL)
+	if strings.HasPrefix(rawURL, "webcal://") {
+		rawURL = "https://" + strings.TrimPrefix(rawURL, "webcal://")
+	}
+	if !strings.HasPrefix(rawURL, "http://") && !strings.HasPrefix(rawURL, "https://") {
+		jsonError(w, http.StatusBadRequest, "Der Link muss mit http://, https:// oder webcal:// beginnen")
+		return
+	}
+
+	// Einmal direkt abrufen, um den Link zu validieren.
+	prov := calendar.NewICSProvider(calendar.ICSConnConfig{URL: rawURL}, user.Timezone)
+	ctx, cancel := context.WithTimeout(r.Context(), 15*time.Second)
+	defer cancel()
+	if _, err := prov.FetchBusy(ctx, time.Now().Add(-time.Hour), time.Now().Add(24*time.Hour)); err != nil {
+		jsonError(w, http.StatusBadRequest, "ICS-Link prüfen: "+err.Error())
+		return
+	}
+
+	if in.DisplayName == "" {
+		if u, err := url.Parse(rawURL); err == nil {
+			in.DisplayName = u.Host
+		} else {
+			in.DisplayName = "ICS-Kalender"
+		}
+	}
+	enc, err := s.encryptConfig(calendar.ICSConnConfig{URL: rawURL})
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Speichern fehlgeschlagen")
+		return
+	}
+	id, err := s.DB.CreateConnection(user.ID, "ics", in.DisplayName, enc)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Verbindung konnte nicht gespeichert werden")
+		return
+	}
+	s.Syncer.SyncInBackground(user)
+	writeJSON(w, http.StatusCreated, ConnectionJSON{ID: id, Provider: "ics", DisplayName: in.DisplayName, CreatedTs: time.Now().Unix()})
+}
+
+func (s *Server) GoogleConnectStart(w http.ResponseWriter, r *http.Request) {
+	if s.Cfg.GoogleClientID == "" || s.Cfg.GoogleClientSecret == "" {
+		jsonError(w, http.StatusServiceUnavailable, "Google-Anmeldung ist nicht konfiguriert (GOOGLE_CLIENT_ID und GOOGLE_CLIENT_SECRET in .env setzen)")
+		return
+	}
+	state, err := s.signJWT(userFrom(r).ID, 10*time.Minute)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "State konnte nicht erzeugt werden")
+		return
+	}
+	conf := calendar.GoogleOAuthConfig(s.Cfg.GoogleClientID, s.Cfg.GoogleClientSecret,
+		s.Cfg.AppURL+"/api/calendars/google/callback")
+	authURL := conf.AuthCodeURL(state,
+		oauth2.AccessTypeOffline,
+		oauth2.SetAuthURLParam("prompt", "consent select_account"),
+	)
+	writeJSON(w, http.StatusOK, map[string]string{"url": authURL})
+}
+
+func (s *Server) GoogleConnectCallback(w http.ResponseWriter, r *http.Request) {
+	fail := func(reason string) {
+		http.Redirect(w, r, s.Cfg.FrontendURL+"/app?google=error&reason="+url.QueryEscape(reason), http.StatusFound)
+	}
+	q := r.URL.Query()
+	if reason := q.Get("error"); reason != "" {
+		fail("Google-Anmeldung abgelehnt: " + reason)
+		return
+	}
+	uid, err := s.verifyJWT(q.Get("state"))
+	if err != nil {
+		fail("Ungültiger or abgelaufener Verbindungsversuch – bitte erneut versuchen")
+		return
+	}
+	user, err := s.DB.UserByID(uid)
+	if err != nil {
+		fail("Konto nicht gefunden")
+		return
+	}
+	conf := calendar.GoogleOAuthConfig(s.Cfg.GoogleClientID, s.Cfg.GoogleClientSecret,
+		s.Cfg.AppURL+"/api/calendars/google/callback")
+	ctx, cancel := context.WithTimeout(r.Context(), 25*time.Second)
+	defer cancel()
+	tok, err := conf.Exchange(ctx, q.Get("code"))
+	if err != nil {
+		fail("Google-Token-Austausch fehlgeschlagen: "+cleanReason(err.Error()))
+		return
+	}
+	calID, summary, err := calendar.GooglePrimaryCalendar(ctx, conf.Client(ctx, tok))
+	if err != nil {
+		fail("Google-Kalender nicht lesbar: "+cleanReason(err.Error()))
+		return
+	}
+	name := summary
+	if name == "" {
+		name = "Google Kalender"
+	}
+	enc, err := s.encryptConfig(calendar.GoogleConnConfig{Token: tok, CalendarID: calID})
+	if err != nil {
+		fail("Speichern fehlgeschlagen")
+		return
+	}
+	if _, err := s.DB.CreateConnection(user.ID, "google", name, enc); err != nil {
+		fail("Verbindung konnte nicht gespeichert werden")
+		return
+	}
+	s.Syncer.SyncInBackground(user)
+	http.Redirect(w, r, s.Cfg.FrontendURL+"/app?google=ok", http.StatusFound)
+}
+
+func (s *Server) SyncNow(w http.ResponseWriter, r *http.Request) {
+	user := userFrom(r)
+	ctx, cancel := context.WithTimeout(context.Background(), 75*time.Second)
+	defer cancel()
+	s.Syncer.SyncUser(ctx, user)
+	s.ListCalendars(w, r)
+}
+
+func (s *Server) encryptConfig(cfg any) (string, error) {
+	data, err := json.Marshal(cfg)
+	if err != nil {
+		return "", err
+	}
+	return crypto.Encrypt(s.Cfg.EncryptionKey, data)
+}
+
+func cleanReason(msg string) string {
+	msg = strings.TrimSpace(msg)
+	if len(msg) > 200 {
+		msg = msg[:200] + "…"
+	}
+	return msg
+}
diff --git a/backend/internal/httpapi/public.go b/backend/internal/httpapi/public.go
new file mode 100644
index 0000000..3f4daa7
--- /dev/null
+++ b/backend/internal/httpapi/public.go
@@ -0,0 +1,201 @@
+package httpapi
+
+import (
+	"context"
+	"net/http"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+
+	"wannpassts/internal/calendar"
+	"wannpassts/internal/db"
+)
+
+var emailRX = regexp.MustCompile(`^[^\s@]+@[^\s@]+\.[^\s@]+$`)
+
+type publicInterval struct {
+	Start string `json:"start"`
+	End   string `json:"end"`
+}
+
+type publicInfo struct {
+	Name        string          `json:"name"`
+	Timezone    string          `json:"timezone"`
+	SlotMinutes int             `json:"slot_minutes"`
+	DayStartMin int             `json:"day_start_min"`
+	DayEndMin   int             `json:"day_end_min"`
+	HorizonDays int             `json:"horizon_days"`
+	Durations   []int           `json:"durations"`
+	Weekdays    []int           `json:"weekdays"`
+	Busy        []publicInterval `json:"busy"`
+}
+
+// PublicInfo liefert die Buchungsseite: Name, Buchungsregeln und ausschließlich
+// busy-Zeiträume – niemals Termintitel, Beschreibungen oder Teilnehmer.
+func (s *Server) PublicInfo(w http.ResponseWriter, r *http.Request) {
+	user, err := s.DB.UserBySlug(chi.URLParam(r, "slug"))
+	if err != nil {
+		jsonError(w, http.StatusNotFound, "Buchungsseite nicht gefunden")
+		return
+	}
+	now := time.Now()
+
+	if conns, err := s.DB.ConnectionsForUser(user.ID); err == nil && calendar.NeedsSync(conns, now) {
+		ctx, cancel := context.WithTimeout(r.Context(), 15*time.Second)
+		s.Syncer.SyncUser(ctx, user)
+		cancel()
+	}
+
+	horizonEnd := now.Add(time.Duration(user.HorizonDays+1) * 24 * time.Hour)
+	busy, err := s.DB.BusyForUser(user.ID, now.Add(-time.Hour).Unix(), horizonEnd.Unix())
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Belegung nicht lesbar")
+		return
+	}
+
+	resp := publicInfo{
+		Name: user.Name, Timezone: user.Timezone,
+		SlotMinutes: user.SlotMinutes, DayStartMin: user.DayStartMin, DayEndMin: user.DayEndMin,
+		HorizonDays: user.HorizonDays,
+		Durations:   csvInts(user.Durations), Weekdays: csvInts(user.Weekdays),
+		Busy: make([]publicInterval, 0, len(busy)),
+	}
+	for _, iv := range mergeBusy(busy) {
+		resp.Busy = append(resp.Busy, publicInterval{
+			Start: time.Unix(iv.StartTs, 0).UTC().Format(time.RFC3339),
+			End:   time.Unix(iv.EndTs, 0).UTC().Format(time.RFC3339),
+		})
+	}
+	writeJSON(w, http.StatusOK, resp)
+}
+
+func mergeBusy(in []db.BusySlot) []db.BusySlot {
+	var out []db.BusySlot
+	for _, s := range in {
+		if n := len(out); n > 0 && s.StartTs <= out[n-1].EndTs {
+			if s.EndTs > out[n-1].EndTs {
+				out[n-1].EndTs = s.EndTs
+			}
+			continue
+		}
+		out = append(out, s)
+	}
+	return out
+}
+
+// CreateBooking nimmt eine Buchungsanfrage an: Validiert gegen Buchungsregeln
+// und Belegung, legt die Anfrage mit Status "pending" an.
+func (s *Server) CreateBooking(w http.ResponseWriter, r *http.Request) {
+	user, err := s.DB.UserBySlug(chi.URLParam(r, "slug"))
+	if err != nil {
+		jsonError(w, http.StatusNotFound, "Buchungsseite nicht gefunden")
+		return
+	}
+	var in struct {
+		Start           string `json:"start"`
+		DurationMinutes int    `json:"duration_minutes"`
+		Name            string `json:"name"`
+		Email           string `json:"email"`
+		Message         string `json:"message"`
+	}
+	if err := decodeBody(r, &in); err != nil {
+		jsonError(w, http.StatusBadRequest, "Anfrage unlesbar")
+		return
+	}
+	in.Name = strings.TrimSpace(in.Name)
+	in.Email = strings.TrimSpace(in.Email)
+	in.Message = strings.TrimSpace(in.Message)
+	if in.Name == "" || len(in.Name) > 100 {
+		jsonError(w, http.StatusBadRequest, "Bitte einen Namen (max. 100 Zeichen) angeben")
+		return
+	}
+	if !emailRX.MatchString(in.Email) || len(in.Email) > 254 {
+		jsonError(w, http.StatusBadRequest, "Bitte eine gültige E-Mail-Adresse angeben")
+		return
+	}
+	if len(in.Message) > 2000 {
+		jsonError(w, http.StatusBadRequest, "Nachricht zu lang (max. 2000 Zeichen)")
+		return
+	}
+
+	allowed := false
+	for _, d := range csvInts(user.Durations) {
+		if d == in.DurationMinutes {
+			allowed = true
+			break
+		}
+	}
+	if !allowed {
+		jsonError(w, http.StatusBadRequest, "Ungültige Dauer")
+		return
+	}
+
+	start, err := time.Parse(time.RFC3339, strings.TrimSpace(in.Start))
+	if err != nil {
+		jsonError(w, http.StatusBadRequest, "Ungültiger Startzeitpunkt")
+		return
+	}
+	end := start.Add(time.Duration(in.DurationMinutes) * time.Minute)
+	now := time.Now()
+
+	if start.Unix() < now.Unix()-120 {
+		jsonError(w, http.StatusBadRequest, "Der Zeitpunkt liegt in der Vergangenheit")
+		return
+	}
+	if start.After(now.Add(time.Duration(user.HorizonDays) * 24 * time.Hour)) {
+		jsonError(w, http.StatusBadRequest, "Der Zeitpunkt liegt außerhalb des Buchungszeitraums")
+		return
+	}
+
+	loc, _ := time.LoadLocation(user.Timezone)
+	if loc == nil {
+		loc = time.UTC
+	}
+	local := start.In(loc)
+	isoWeekday := (int(local.Weekday())+6)%7 + 1 // Mo=1 … So=7
+	if !containsInt(csvInts(user.Weekdays), isoWeekday) {
+		jsonError(w, http.StatusBadRequest, "An diesem Tag werden keine Buchungen angenommen")
+		return
+	}
+	minuteOfDay := local.Hour()*60 + local.Minute()
+	if minuteOfDay < user.DayStartMin-2 || minuteOfDay+in.DurationMinutes > user.DayEndMin+2 {
+		jsonError(w, http.StatusBadRequest, "Außerhalb der Buchungszeiten")
+		return
+	}
+
+	busy, err := s.DB.BusyForUser(user.ID, start.Unix()-1, end.Unix()+1)
+	if err != nil {
+		jsonError(w, http.StatusInternalServerError, "Belegung nicht prüfbar")
+		return
+	}
+	for _, b := range busy {
+		if b.StartTs < end.Unix() && start.Unix() < b.EndTs {
+			jsonError(w, http.StatusConflict, "Dieser Zeitraum ist leider bereits belegt")
+			return
+		}
+	}
+
+	booking := &db.Booking{
+		UserID: user.ID, StartTs: start.Unix(), EndTs: end.Unix(),
+		RequesterName: in.Name, RequesterEmail: in.Email, Message: in.Message,
+	}
+	if err := s.DB.CreateBooking(booking); err != nil {
+		jsonError(w, http.StatusInternalServerError, "Anfrage konnte nicht gespeichert werden")
+		return
+	}
+	booking.Status = "pending"
+	writeJSON(w, http.StatusCreated, map[string]any{
+		"id": booking.ID, "status": booking.Status,
+	})
+}
+
+func containsInt(list []int, v int) bool {
+	for _, x := range list {
+		if x == v {
+			return true
+		}
+	}
+	return false
+}
diff --git a/backend/internal/httpapi/server.go b/backend/internal/httpapi/server.go
new file mode 100644
index 0000000..b884008
--- /dev/null
+++ b/backend/internal/httpapi/server.go
@@ -0,0 +1,280 @@
+package httpapi
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+	"github.com/go-chi/cors"
+	"github.com/golang-jwt/jwt/v5"
+
+	"wannpassts/internal/calendar"
+	"wannpassts/internal/config"
+	"wannpassts/internal/db"
+)
+
+type Server struct {
+	DB     *db.DB
+	Cfg    *config.Config
+	Syncer *calendar.Syncer
+}
+
+func New(database *db.DB, cfg *config.Config, syncer *calendar.Syncer) *Server {
+	return &Server{DB: database, Cfg: cfg, Syncer: syncer}
+}
+
+type ctxKey int
+
+const ctxUser ctxKey = 1
+
+func (s *Server) Router() http.Handler {
+	r := chi.NewRouter()
+	r.Use(middleware.RequestID, middleware.RealIP, middleware.Logger, middleware.Recoverer)
+	r.Use(cors.Handler(cors.Options{
+		AllowedOrigins: allowedOrigins(s.Cfg.FrontendURL),
+		AllowedMethods: []string{"GET", "POST", "PATCH", "DELETE", "OPTIONS"},
+		AllowedHeaders: []string{"Authorization", "Content-Type"},
+		MaxAge:         300,
+	}))
+	r.Get("/api/health", func(w http.ResponseWriter, _ *http.Request) {
+		writeJSON(w, http.StatusOK, map[string]string{"status": "ok"})
+	})
+
+	r.Route("/api", func(api chi.Router) {
+		api.Post("/auth/register", s.Register)
+		api.Post("/auth/login", s.Login)
+
+		api.Get("/calendars/google/callback", s.GoogleConnectCallback)
+		api.Get("/public/{slug}", s.PublicInfo)
+		api.Post("/public/{slug}/bookings", s.CreateBooking)
+
+		api.Group(func(prt chi.Router) {
+			prt.Use(s.AuthMiddleware)
+			prt.Get("/me", s.Me)
+			prt.Patch("/me", s.UpdateMe)
+			prt.Post("/me/slug", s.RegenSlug)
+			prt.Get("/calendars", s.ListCalendars)
+			prt.Delete("/calendars/{id}", s.DeleteCalendar)
+			prt.Post("/calendars/caldav", s.ConnectCalDAV)
+			prt.Post("/calendars/ics", s.ConnectICS)
+			prt.Get("/calendars/google/start", s.GoogleConnectStart)
+			prt.Post("/calendars/sync", s.SyncNow)
+			prt.Get("/bookings", s.ListBookings)
+			prt.Post("/bookings/{id}/accept", s.AcceptBooking)
+			prt.Post("/bookings/{id}/decline", s.DeclineBooking)
+		})
+	})
+
+	if s.Cfg.StaticDir != "" {
+		if st, err := os.Stat(s.Cfg.StaticDir); err == nil && st.IsDir() {
+			static := s.Cfg.StaticDir
+			r.Get("/*", func(w http.ResponseWriter, req *http.Request) {
+				p := filepath.Join(static, filepath.Clean(req.URL.Path))
+				if st, err := os.Stat(p); err == nil && !st.IsDir() {
+					http.ServeFile(w, req, p)
+					return
+				}
+				http.ServeFile(w, req, filepath.Join(static, "index.html"))
+			})
+		}
+	}
+	return r
+}
+
+func allowedOrigins(frontendURL string) []string {
+	origins := []string{"http://localhost:5173", "http://127.0.0.1:5173"}
+	for _, o := range strings.Split(frontendURL, ",") {
+		o = strings.TrimSpace(o)
+		if o != "" && !contains(origins, o) {
+			origins = append(origins, o)
+		}
+	}
+	return origins
+}
+
+func contains(list []string, v string) bool {
+	for _, x := range list {
+		if x == v {
+			return true
+		}
+	}
+	return false
+}
+
+// --- Auth Middleware & JWT ---
+
+func (s *Server) signJWT(userID int64, ttl time.Duration) (string, error) {
+	claims := jwt.RegisteredClaims{
+		Subject:   strconv.FormatInt(userID, 10),
+		IssuedAt:  jwt.NewNumericDate(time.Now()),
+		ExpiresAt: jwt.NewNumericDate(time.Now().Add(ttl)),
+	}
+	tok := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return tok.SignedString([]byte(s.Cfg.JWTSecret))
+}
+
+func (s *Server) verifyJWT(tokenStr string) (int64, error) {
+	token, err := jwt.Parse(tokenStr, func(t *jwt.Token) (any, error) {
+		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.New("unerwartete Signaturmethode")
+		}
+		return []byte(s.Cfg.JWTSecret), nil
+	})
+	if err != nil || !token.Valid {
+		return 0, errors.New("Token ungültig oder abgelaufen")
+	}
+	claims, ok := token.Claims.(jwt.MapClaims)
+	if !ok {
+		return 0, errors.New("Claims unlesbar")
+	}
+	sub, _ := claims["sub"].(string)
+	id, err := strconv.ParseInt(sub, 10, 64)
+	if err != nil {
+		return 0, errors.New("Subject unlesbar")
+	}
+	return id, nil
+}
+
+func (s *Server) AuthMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		h := r.Header.Get("Authorization")
+		if !strings.HasPrefix(h, "Bearer ") {
+			jsonError(w, http.StatusUnauthorized, "Nicht angemeldet")
+			return
+		}
+		uid, err := s.verifyJWT(strings.TrimSpace(h[len("Bearer "):]))
+		if err != nil {
+			jsonError(w, http.StatusUnauthorized, "Sitzung ungültig oder abgelaufen")
+			return
+		}
+		user, err := s.DB.UserByID(uid)
+		if err != nil {
+			jsonError(w, http.StatusUnauthorized, "Konto nicht gefunden")
+			return
+		}
+		next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), ctxUser, user)))
+	})
+}
+
+func userFrom(r *http.Request) *db.User {
+	return r.Context().Value(ctxUser).(*db.User)
+}
+
+// --- JSON helpers ---
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(status)
+	if v != nil {
+		_ = json.NewEncoder(w).Encode(v)
+	}
+}
+
+func jsonError(w http.ResponseWriter, status int, msg string) {
+	writeJSON(w, status, map[string]string{"error": msg})
+}
+
+func decodeBody(r *http.Request, v any) error {
+	defer r.Body.Close()
+	dec := json.NewDecoder(http.MaxBytesReader(nil, r.Body, 1<<20))
+	return dec.Decode(v)
+}
+
+func pathID(r *http.Request) (int64, error) {
+	return strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
+}
+
+// --- JSON Darstellungen ---
+
+type UserJSON struct {
+	ID          int64   `json:"id"`
+	Email       string  `json:"email"`
+	Name        string  `json:"name"`
+	Slug        string  `json:"slug"`
+	Timezone    string  `json:"timezone"`
+	SlotMinutes int     `json:"slot_minutes"`
+	DayStartMin int     `json:"day_start_min"`
+	DayEndMin   int     `json:"day_end_min"`
+	HorizonDays int     `json:"horizon_days"`
+	Durations   []int   `json:"durations"`
+	Weekdays    []int   `json:"weekdays"`
+	CreatedTs   int64   `json:"created_ts"`
+}
+
+func userToJSON(u *db.User) UserJSON {
+	return UserJSON{
+		ID: u.ID, Email: u.Email, Name: u.Name, Slug: u.Slug, Timezone: u.Timezone,
+		SlotMinutes: u.SlotMinutes, DayStartMin: u.DayStartMin, DayEndMin: u.DayEndMin,
+		HorizonDays: u.HorizonDays, Durations: csvInts(u.Durations), Weekdays: csvInts(u.Weekdays),
+		CreatedTs: u.CreatedTs,
+	}
+}
+
+func csvInts(csv string) []int {
+	var out []int
+	for _, p := range strings.Split(csv, ",") {
+		if v, err := strconv.Atoi(strings.TrimSpace(p)); err == nil {
+			out = append(out, v)
+		}
+	}
+	return out
+}
+
+func intsCSV(list []int) string {
+	parts := make([]string, len(list))
+	for i, v := range list {
+		parts[i] = strconv.Itoa(v)
+	}
+	return strings.Join(parts, ",")
+}
+
+type ConnectionJSON struct {
+	ID           int64   `json:"id"`
+	Provider     string  `json:"provider"`
+	DisplayName  string  `json:"display_name"`
+	LastSyncedTs *int64  `json:"last_synced_ts"`
+	LastError    *string `json:"last_error"`
+	CreatedTs    int64   `json:"created_ts"`
+}
+
+func connToJSON(c *db.Connection) ConnectionJSON {
+	out := ConnectionJSON{ID: c.ID, Provider: c.Provider, DisplayName: c.DisplayName, CreatedTs: c.CreatedTs}
+	if c.LastSyncedTs.Valid {
+		v := c.LastSyncedTs.Int64
+		out.LastSyncedTs = &v
+	}
+	if c.LastError.Valid && c.LastError.String != "" {
+		v := c.LastError.String
+		out.LastError = &v
+	}
+	return out
+}
+
+type BookingJSON struct {
+	ID             int64  `json:"id"`
+	Start          string `json:"start"`
+	End            string `json:"end"`
+	RequesterName  string `json:"requester_name"`
+	RequesterEmail string `json:"requester_email"`
+	Message        string `json:"message"`
+	Status         string `json:"status"`
+	CreatedTs      int64  `json:"created_ts"`
+}
+
+func bookingToJSON(b *db.Booking) BookingJSON {
+	return BookingJSON{
+		ID: b.ID,
+		Start: time.Unix(b.StartTs, 0).UTC().Format(time.RFC3339),
+		End:   time.Unix(b.EndTs, 0).UTC().Format(time.RFC3339),
+		RequesterName: b.RequesterName, RequesterEmail: b.RequesterEmail,
+		Message: b.Message, Status: b.Status, CreatedTs: b.CreatedTs,
+	}
+}
diff --git a/frontend/index.html b/frontend/index.html
new file mode 100644
index 0000000..6727ee7
--- /dev/null
+++ b/frontend/index.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<html lang="de">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta name="theme-color" content="#05070c" />
+    <meta
+      name="description"
+      content="WannPassts – Deine freien Zeiten, geteilt per Link. Verbinde Google-, iCloud- und andere Kalender und nimm Buchungsanfragen an, ohne deine Termine preiszugeben."
+    />
+    <title>WannPassts</title>
+    <link rel="preconnect" href="https://fonts.googleapis.com" />
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+    <link
+      href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap"
+      rel="stylesheet"
+    />
+  </head>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
new file mode 100644
index 0000000..5b7d82a
--- /dev/null
+++ b/frontend/package-lock.json
@@ -0,0 +1,1659 @@
+{
+  "name": "wannpassts-frontend",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "wannpassts-frontend",
+      "version": "1.0.0",
+      "dependencies": {
+        "pinia": "^3.0.2",
+        "vue": "^3.5.13",
+        "vue-router": "^4.5.0"
+      },
+      "devDependencies": {
+        "@vitejs/plugin-vue": "^5.2.3",
+        "typescript": "~5.8.3",
+        "vite": "^6.3.5",
+        "vue-tsc": "^2.2.10"
+      }
+    },
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+      "license": "MIT",
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+      }
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+        "@vue/compiler-sfc": "3.5.41",
+        "@vue/runtime-dom": "3.5.41",
+        "@vue/server-renderer": "3.5.41",
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+        "@vue/language-core": "2.2.12"
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+}
diff --git a/frontend/package.json b/frontend/package.json
new file mode 100644
index 0000000..44fd48b
--- /dev/null
+++ b/frontend/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "wannpassts-frontend",
+  "private": true,
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vue-tsc --noEmit && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "pinia": "^3.0.2",
+    "vue": "^3.5.13",
+    "vue-router": "^4.5.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^5.2.3",
+    "typescript": "~5.8.3",
+    "vite": "^6.3.5",
+    "vue-tsc": "^2.2.10"
+  }
+}
diff --git a/frontend/public/favicon.svg b/frontend/public/favicon.svg
new file mode 100644
index 0000000..4120d30
--- /dev/null
+++ b/frontend/public/favicon.svg
@@ -0,0 +1,12 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48">
+  <defs>
+    <linearGradient id="g" x1="0" y1="0" x2="1" y2="1">
+      <stop offset="0" stop-color="#7db0ff"/>
+      <stop offset="1" stop-color="#b78cff"/>
+    </linearGradient>
+  </defs>
+  <rect x="4" y="6" width="40" height="38" rx="11" fill="#0b0f1a" stroke="url(#g)" stroke-width="2.5"/>
+  <rect x="4" y="6" width="40" height="10" rx="5" fill="url(#g)" opacity="0.35"/>
+  <path d="M15 3.5v6M33 3.5v6" stroke="url(#g)" stroke-width="3" stroke-linecap="round"/>
+  <path d="M15 26.5l6 6 12-12" stroke="url(#g)" stroke-width="4" stroke-linecap="round" stroke-linejoin="round" fill="none"/>
+</svg>
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
new file mode 100644
index 0000000..e9490c7
--- /dev/null
+++ b/frontend/src/App.vue
@@ -0,0 +1,34 @@
+<script setup lang="ts">
+import { onMounted } from 'vue'
+import { useAuth } from './stores/auth'
+import { useToast } from './stores/toast'
+
+const auth = useAuth()
+const toast = useToast()
+
+onMounted(() => {
+  auth.init()
+})
+</script>
+
+<template>
+  <div class="bg-scene" aria-hidden="true">
+    <div class="orb orb-1"></div>
+    <div class="orb orb-2"></div>
+    <div class="orb orb-3"></div>
+  </div>
+
+  <router-view />
+
+  <transition-group name="fade" tag="div" class="toasts">
+    <div
+      v-for="t in toast.toasts"
+      :key="t.id"
+      class="toast glass"
+      :class="{ 'toast-ok': t.kind === 'ok', 'toast-error': t.kind === 'error' }"
+      role="status"
+    >
+      {{ t.message }}
+    </div>
+  </transition-group>
+</template>
diff --git a/frontend/src/components/GlassCard.vue b/frontend/src/components/GlassCard.vue
new file mode 100644
index 0000000..57ec1ee
--- /dev/null
+++ b/frontend/src/components/GlassCard.vue
@@ -0,0 +1,36 @@
+<script setup lang="ts">
+defineProps<{ title?: string; subtitle?: string }>()
+</script>
+
+<template>
+  <section class="glass card">
+    <header v-if="title || subtitle || $slots.header" class="card-head">
+      <div class="grow">
+        <h2 v-if="title">{{ title }}</h2>
+        <p v-if="subtitle" class="muted small" style="margin: 4px 0 0">{{ subtitle }}</p>
+      </div>
+      <slot name="header" />
+    </header>
+    <slot />
+  </section>
+</template>
+
+<style scoped>
+.card {
+  padding: 22px 24px;
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+}
+.card-head {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+}
+h2 {
+  margin: 0;
+  font-size: 17px;
+  font-weight: 700;
+  letter-spacing: 0.01em;
+}
+</style>
diff --git a/frontend/src/components/LogoMark.vue b/frontend/src/components/LogoMark.vue
new file mode 100644
index 0000000..77cee93
--- /dev/null
+++ b/frontend/src/components/LogoMark.vue
@@ -0,0 +1,22 @@
+<template>
+  <svg class="logo" viewBox="0 0 48 48" fill="none" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
+    <defs>
+      <linearGradient id="wp-lg" x1="0" y1="0" x2="1" y2="1">
+        <stop offset="0" stop-color="#7db0ff" />
+        <stop offset="1" stop-color="#b78cff" />
+      </linearGradient>
+    </defs>
+    <rect x="4.75" y="6.75" width="38.5" height="36.5" rx="10.5" fill="rgba(255,255,255,0.06)" stroke="url(#wp-lg)" stroke-width="2.2" />
+    <path d="M5 16h38" stroke="url(#wp-lg)" stroke-width="2.2" opacity="0.7" />
+    <path d="M15 3.5v6M33 3.5v6" stroke="url(#wp-lg)" stroke-width="3" stroke-linecap="round" />
+    <path d="M15 27l6.5 6.5L33.5 21" stroke="url(#wp-lg)" stroke-width="3.6" stroke-linecap="round" stroke-linejoin="round" />
+  </svg>
+</template>
+
+<style scoped>
+.logo {
+  width: 34px;
+  height: 34px;
+  filter: drop-shadow(0 4px 14px rgba(125, 176, 255, 0.35));
+}
+</style>
diff --git a/frontend/src/components/SectionConnections.vue b/frontend/src/components/SectionConnections.vue
new file mode 100644
index 0000000..9717f36
--- /dev/null
+++ b/frontend/src/components/SectionConnections.vue
@@ -0,0 +1,239 @@
+<script setup lang="ts">
+import { onMounted, onUnmounted, ref } from 'vue'
+import { ApiError, api } from '../lib/api'
+import type { Connection } from '../lib/types'
+import { useToast } from '../stores/toast'
+import GlassCard from './GlassCard.vue'
+
+const toast = useToast()
+const connections = ref<Connection[] | null>(null)
+const syncing = ref(false)
+const busy = ref(false)
+
+const showCalDAV = ref(false)
+const showICS = ref(false)
+
+const caldav = ref({ server_url: 'https://caldav.icloud.com', username: '', password: '', calendar_path: '', display_name: '' })
+const ics = ref({ url: '', display_name: '' })
+
+let pollTimer: ReturnType<typeof setTimeout> | null = null
+
+const providerLabel: Record<Connection['provider'], string> = {
+  google: 'Google',
+  caldav: 'CalDAV / iCloud',
+  ics: 'ICS-Abo',
+}
+const providerIcon: Record<Connection['provider'], string> = {
+  google: '🇬',
+  caldav: '☁️',
+  ics: '📡',
+}
+
+async function load() {
+  try {
+    connections.value = await api.connections()
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Laden fehlgeschlagen')
+  }
+}
+
+function schedulePoll() {
+  pollTimer = setTimeout(load, 3500)
+}
+
+onMounted(() => {
+  load()
+  schedulePoll()
+})
+onUnmounted(() => {
+  if (pollTimer) clearTimeout(pollTimer)
+})
+
+async function syncNow() {
+  syncing.value = true
+  try {
+    connections.value = await api.syncNow()
+    toast.ok('Kalender synchronisiert')
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Sync fehlgeschlagen')
+  } finally {
+    syncing.value = false
+  }
+}
+
+async function connectGoogle() {
+  try {
+    const { url } = await api.googleStart()
+    location.href = url
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Google-Start fehlgeschlagen')
+  }
+}
+
+async function submitCalDAV() {
+  busy.value = true
+  try {
+    await api.connectCalDAV({
+      server_url: caldav.value.server_url,
+      username: caldav.value.username,
+      password: caldav.value.password,
+      calendar_path: caldav.value.calendar_path || undefined,
+      display_name: caldav.value.display_name || undefined,
+    })
+    toast.ok('Kalender verbunden – erste Synchronisierung läuft.')
+    showCalDAV.value = false
+    caldav.value.username = ''
+    caldav.value.password = ''
+    await load()
+    schedulePoll()
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Verbinden fehlgeschlagen')
+  } finally {
+    busy.value = false
+  }
+}
+
+async function submitICS() {
+  busy.value = true
+  try {
+    await api.connectICS({ url: ics.value.url, display_name: ics.value.display_name || undefined })
+    toast.ok('ICS-Kalender verbunden.')
+    showICS.value = false
+    ics.value.url = ''
+    ics.value.display_name = ''
+    await load()
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Verbinden fehlgeschlagen')
+  } finally {
+    busy.value = false
+  }
+}
+
+async function remove(conn: Connection) {
+  if (!confirm(`„${conn.display_name}“ wirklich entfernen?`)) return
+  try {
+    await api.deleteConnection(conn.id)
+    connections.value = (connections.value ?? []).filter((c) => c.id !== conn.id)
+    toast.ok('Verbindung entfernt')
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Löschen fehlgeschlagen')
+  }
+}
+
+function syncedAgo(ts: number | null): string {
+  if (!ts) return 'wird synchronisiert…'
+  const s = Math.max(0, Math.round(Date.now() / 1000 - ts))
+  if (s < 60) return `vor ${s}s`
+  if (s < 3600) return `vor ${Math.round(s / 60)} Min.`
+  return `vor ${Math.round(s / 3600)} Std.`
+}
+</script>
+
+<template>
+  <div class="col">
+    <GlassCard title="Kalender hinzufügen" subtitle="WannPassts liest nur frei/belegt – nie Termindetails.">
+      <div class="row add-row">
+        <button class="btn" @click="connectGoogle">🇬 Google Kalender</button>
+        <button class="btn" @click="showCalDAV = !showCalDAV; showICS = false">☁️ iCloud / CalDAV</button>
+        <button class="btn" @click="showICS = !showICS; showCalDAV = false">📡 ICS-Link</button>
+      </div>
+
+      <transition name="fade">
+        <form v-if="showCalDAV" class="glass-soft form" @submit.prevent="submitCalDAV">
+          <p class="muted small" style="margin: 0 0 4px">
+            Für iCloud: <strong>Apple-ID</strong> als Benutzername und ein
+            <a href="https://appleid.apple.com/account/manage" target="_blank" rel="noopener">App-spezifisches Passwort</a>
+            (Konto → Anmeldung und Sicherheit). Auch Fastmail, Nextcloud &amp; Co. funktionieren.
+          </p>
+          <div class="form-grid">
+            <label class="field">
+              <span>Server</span>
+              <input v-model="caldav.server_url" required class="input" />
+            </label>
+            <label class="field">
+              <span>Benutzername</span>
+              <input v-model="caldav.username" required class="input" autocomplete="username" />
+            </label>
+            <label class="field">
+              <span>Passwort (App-spezifisch)</span>
+              <input v-model="caldav.password" type="password" required class="input" autocomplete="current-password" />
+            </label>
+            <label class="field">
+              <span>Kalender-Pfad (optional)</span>
+              <input v-model="caldav.calendar_path" class="input" placeholder="wird automatisch erkannt" />
+            </label>
+            <label class="field">
+              <span>Anzeigename (optional)</span>
+              <input v-model="caldav.display_name" class="input" placeholder="z. B. Privatkalender" />
+            </label>
+          </div>
+          <button class="btn btn-primary" type="submit" :disabled="busy">
+            {{ busy ? 'Verbinde…' : 'Verbinden' }}
+          </button>
+        </form>
+      </transition>
+
+      <transition name="fade">
+        <form v-if="showICS" class="glass-soft form" @submit.prevent="submitICS">
+          <p class="muted small" style="margin: 0 0 4px">
+            Funktioniert mit jedem öffentlichen ICS/webcal-Link, z. B. der „privaten Adresse im
+            iCal-Format“ eines Google-Kalenders oder Ferien-/Schichtplänen.
+          </p>
+          <label class="field">
+            <span>ICS-URL</span>
+            <input v-model="ics.url" required class="input" placeholder="https://…/kalender.ics" />
+          </label>
+          <label class="field">
+            <span>Anzeigename (optional)</span>
+            <input v-model="ics.display_name" class="input" placeholder="z. B. Schichtplan" />
+          </label>
+          <button class="btn btn-primary" type="submit" :disabled="busy">
+            {{ busy ? 'Prüfe…' : 'Hinzufügen' }}
+          </button>
+        </form>
+      </transition>
+    </GlassCard>
+
+    <GlassCard title="Verbundene Kalender">
+      <template #header>
+        <button class="btn btn-sm" :disabled="syncing" @click="syncNow">
+          {{ syncing ? 'Synchronisiere…' : '↻ Jetzt synchronisieren' }}
+        </button>
+      </template>
+
+      <div v-if="connections === null" class="skeleton" style="height: 72px"></div>
+      <p v-else-if="connections.length === 0" class="muted small" style="margin: 0">
+        Noch kein Kalender verbunden. Oben einen hinzufügen – ohne Kalender sind alle Zeiten frei.
+      </p>
+      <div v-else class="col conn-list">
+        <div v-for="c in connections" :key="c.id" class="glass-soft conn">
+          <span class="conn-icon">{{ providerIcon[c.provider] }}</span>
+          <div class="grow">
+            <div class="row">
+              <strong>{{ c.display_name }}</strong>
+              <span class="badge">{{ providerLabel[c.provider] }}</span>
+            </div>
+            <div class="row small">
+              <span :class="c.last_error ? 'err' : 'muted'">
+                {{ c.last_error ? '⚠ ' + c.last_error : '✓ synchronisiert ' + syncedAgo(c.last_synced_ts) }}
+              </span>
+            </div>
+          </div>
+          <button class="btn btn-sm btn-danger" @click="remove(c)">Entfernen</button>
+        </div>
+      </div>
+    </GlassCard>
+  </div>
+</template>
+
+<style scoped>
+.add-row { flex-wrap: wrap; }
+.form { padding: 18px; display: flex; flex-direction: column; gap: 14px; }
+.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
+.form a { color: var(--accent); }
+.conn { display: flex; align-items: center; gap: 14px; padding: 14px 16px; }
+.conn-icon { font-size: 22px; }
+.err { color: var(--danger); }
+a { color: var(--accent); text-decoration: none; }
+a:hover { text-decoration: underline; }
+</style>
diff --git a/frontend/src/components/SectionRequests.vue b/frontend/src/components/SectionRequests.vue
new file mode 100644
index 0000000..dce4966
--- /dev/null
+++ b/frontend/src/components/SectionRequests.vue
@@ -0,0 +1,104 @@
+<script setup lang="ts">
+import { onMounted, ref } from 'vue'
+import { ApiError, api } from '../lib/api'
+import type { Booking } from '../lib/types'
+import { useAuth } from '../stores/auth'
+import { useToast } from '../stores/toast'
+import { formatRange } from '../lib/tz'
+import GlassCard from './GlassCard.vue'
+
+const auth = useAuth()
+const toast = useToast()
+const bookings = ref<Booking[] | null>(null)
+const busyId = ref<number | null>(null)
+
+async function load() {
+  try {
+    bookings.value = await api.bookings()
+  } catch (e) {
+    if (e instanceof ApiError && e.status === 401) {
+      auth.logout()
+      return
+    }
+    toast.error(e instanceof ApiError ? e.message : 'Laden fehlgeschlagen')
+  }
+}
+onMounted(load)
+
+async function accept(b: Booking) {
+  busyId.value = b.id
+  try {
+    await api.acceptBooking(b.id)
+    toast.ok('Anfrage angenommen – Zeitraum ist jetzt belegt.')
+    await load()
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Annehmen fehlgeschlagen')
+  } finally {
+    busyId.value = null
+  }
+}
+
+async function decline(b: Booking) {
+  busyId.value = b.id
+  try {
+    await api.declineBooking(b.id)
+    toast.push('Anfrage abgelehnt.', 'info')
+    await load()
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Ablehnen fehlgeschlagen')
+  } finally {
+    busyId.value = null
+  }
+}
+
+const statusLabel = { pending: 'Offen', accepted: 'Angenommen', declined: 'Abgelehnt' } as const
+</script>
+
+<template>
+  <GlassCard title="Buchungsanfragen" :subtitle="`Zeitzone: ${auth.user?.timezone ?? ''} · Zeiten aus deinen Buchungsregeln`">
+    <div v-if="bookings === null" class="skeleton" style="height: 90px"></div>
+    <p v-else-if="bookings.length === 0" class="muted small" style="margin: 0">
+      Noch keine Anfragen. Teile deinen Buchungslink, damit es losgehen kann ✨
+    </p>
+    <div v-else class="col">
+      <article v-for="b in bookings" :key="b.id" class="glass-soft req" :class="{ dimmed: b.status !== 'pending' }">
+        <div class="req-head">
+          <div class="grow">
+            <div class="row">
+              <strong>{{ b.requester_name }}</strong>
+              <span class="badge" :class="`badge-${b.status}`">{{ statusLabel[b.status] }}</span>
+            </div>
+            <span class="faint small">{{ b.requester_email }}</span>
+          </div>
+          <div class="req-actions">
+            <template v-if="b.status === 'pending'">
+              <button class="btn btn-sm btn-primary" :disabled="busyId === b.id" @click="accept(b)">Annehmen</button>
+              <button class="btn btn-sm btn-danger" :disabled="busyId === b.id" @click="decline(b)">Ablehnen</button>
+            </template>
+            <button v-else-if="b.status === 'accepted'" class="btn btn-sm" :disabled="busyId === b.id" @click="decline(b)">
+              Doch ablehnen
+            </button>
+          </div>
+        </div>
+        <div class="time">🕒 {{ formatRange(b.start, b.end, auth.user?.timezone ?? 'UTC') }}</div>
+        <p v-if="b.message" class="msg">{{ b.message }}</p>
+      </article>
+    </div>
+  </GlassCard>
+</template>
+
+<style scoped>
+.req { padding: 16px 18px; display: flex; flex-direction: column; gap: 8px; }
+.req.dimmed { opacity: 0.6; }
+.req-head { display: flex; align-items: flex-start; gap: 12px; }
+.req-actions { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
+.time { font-size: 15px; font-weight: 600; color: var(--accent); }
+.msg {
+  margin: 0;
+  padding: 10px 14px;
+  border-left: 2px solid var(--border);
+  color: var(--text-muted);
+  font-size: 14px;
+  white-space: pre-wrap;
+}
+</style>
diff --git a/frontend/src/components/SectionSettings.vue b/frontend/src/components/SectionSettings.vue
new file mode 100644
index 0000000..100df00
--- /dev/null
+++ b/frontend/src/components/SectionSettings.vue
@@ -0,0 +1,155 @@
+<script setup lang="ts">
+import { reactive } from 'vue'
+import { ApiError, api } from '../lib/api'
+import { useAuth } from '../stores/auth'
+import { useToast } from '../stores/toast'
+import GlassCard from './GlassCard.vue'
+
+const auth = useAuth()
+const toast = useToast()
+const user = auth.user!
+
+const weekdayNames = ['Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag', 'Sonntag']
+
+function minutesToHHMM(m: number): string {
+  return `${String(Math.floor(m / 60)).padStart(2, '0')}:${String(m % 60).padStart(2, '0')}`
+}
+function hhmmToMinutes(s: string): number {
+  const [h, m] = s.split(':').map((v) => parseInt(v, 10))
+  return (isNaN(h) ? 0 : h) * 60 + (isNaN(m) ? 0 : m)
+}
+
+const form = reactive({
+  name: user.name,
+  timezone: user.timezone,
+  slot_minutes: user.slot_minutes,
+  day_start: minutesToHHMM(user.day_start_min),
+  day_end: minutesToHHMM(user.day_end_min),
+  horizon_days: user.horizon_days,
+  durations: user.durations.join(', '),
+  weekdays: new Set(user.weekdays),
+})
+
+let saving = false
+
+async function save() {
+  if (saving) return
+  saving = true
+  try {
+    const durations = form.durations
+      .split(',')
+      .map((s) => parseInt(s.trim(), 10))
+      .filter((n) => !isNaN(n))
+    const res = await api.updateMe({
+      name: form.name,
+      timezone: form.timezone,
+      slot_minutes: form.slot_minutes,
+      day_start_min: hhmmToMinutes(form.day_start),
+      day_end_min: hhmmToMinutes(form.day_end),
+      horizon_days: form.horizon_days,
+      durations,
+      weekdays: [...form.weekdays].sort((a, b) => a - b),
+    })
+    auth.setUser(res.user)
+    toast.ok('Einstellungen gespeichert')
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Speichern fehlgeschlagen')
+  } finally {
+    saving = false
+  }
+}
+
+async function newSlug() {
+  if (!confirm('Neuen Link erzeugen? Der alte Link funktioniert dann nicht mehr.')) return
+  try {
+    const res = await api.regenSlug()
+    auth.setUser(res.user)
+    toast.ok('Neuer Buchungslink erzeugt')
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Fehler beim Erneuern')
+  }
+}
+
+function toggleWeekday(n: number) {
+  if (form.weekdays.has(n)) form.weekdays.delete(n)
+  else form.weekdays.add(n)
+}
+</script>
+
+<template>
+  <div class="col">
+    <GlassCard title="Buchungsregeln" subtitle="Diese Regeln gelten für deine öffentliche Buchungsseite.">
+      <div class="form-grid">
+        <label class="field">
+          <span>Anzeigename</span>
+          <input v-model="form.name" class="input" maxlength="80" />
+        </label>
+        <label class="field">
+          <span>Zeitzone (IANA, z. B. Europe/Berlin)</span>
+          <input v-model="form.timezone" class="input" />
+        </label>
+        <label class="field">
+          <span>Buchbar ab / bis (Uhrzeit)</span>
+          <div class="row">
+            <input v-model="form.day_start" type="time" class="input" required />
+            <span class="muted">–</span>
+            <input v-model="form.day_end" type="time" class="input" required />
+          </div>
+        </label>
+        <label class="field">
+          <span>Slot-Raster (Minuten)</span>
+          <select v-model.number="form.slot_minutes" class="input">
+            <option :value="10">10</option>
+            <option :value="15">15</option>
+            <option :value="20">20</option>
+            <option :value="30">30</option>
+            <option :value="60">60</option>
+          </select>
+        </label>
+        <label class="field">
+          <span>Horizont (Tage im Voraus)</span>
+          <input v-model.number="form.horizon_days" type="number" min="1" max="120" class="input" />
+        </label>
+        <label class="field">
+          <span>Mögliche Dauern (Minuten, kommagetrennt)</span>
+          <input v-model="form.durations" class="input" placeholder="15, 30, 60, 120" />
+        </label>
+      </div>
+
+      <div class="field">
+        <span class="small muted" style="font-weight: 500">Buchbare Wochentage</span>
+        <div class="row weekdays">
+          <button
+            v-for="(name, i) in weekdayNames"
+            :key="i"
+            type="button"
+            class="btn btn-sm weekday"
+            :class="{ on: form.weekdays.has(i + 1) }"
+            @click="toggleWeekday(i + 1)"
+          >
+            {{ name }}
+          </button>
+        </div>
+      </div>
+
+      <div class="row">
+        <button class="btn btn-primary" @click="save">Speichern</button>
+      </div>
+    </GlassCard>
+
+    <GlassCard title="Buchungslink erneuern" subtitle="Erzeugt einen neuen Slug – der alte Link verfällt sofort.">
+      <button class="btn btn-danger" @click="newSlug">Neuen Link generieren</button>
+    </GlassCard>
+  </div>
+</template>
+
+<style scoped>
+.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; }
+.weekdays { flex-wrap: wrap; }
+.weekday { opacity: 0.55; }
+.weekday.on {
+  opacity: 1;
+  border-color: rgba(125, 176, 255, 0.6);
+  background: rgba(125, 176, 255, 0.12);
+}
+</style>
diff --git a/frontend/src/components/ShareLinkCard.vue b/frontend/src/components/ShareLinkCard.vue
new file mode 100644
index 0000000..3a6639a
--- /dev/null
+++ b/frontend/src/components/ShareLinkCard.vue
@@ -0,0 +1,46 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { useAuth } from '../stores/auth'
+import { useToast } from '../stores/toast'
+import GlassCard from './GlassCard.vue'
+
+const auth = useAuth()
+const toast = useToast()
+const copied = ref(false)
+
+const link = computed(() => `${location.origin}/b/${auth.user?.slug ?? ''}`)
+
+async function copy() {
+  try {
+    await navigator.clipboard.writeText(link.value)
+    copied.value = true
+    toast.ok('Link kopiert!')
+    setTimeout(() => (copied.value = false), 2000)
+  } catch {
+    toast.error('Kopieren nicht möglich – bitte manuell markieren.')
+  }
+}
+</script>
+
+<template>
+  <GlassCard title="🔗 Dein Buchungslink" subtitle="Teile diesen Link – andere sehen nur frei/belegt und können anfragen.">
+    <div class="row link-row">
+      <code class="link glass-soft grow">{{ link }}</code>
+      <button class="btn btn-primary" @click="copy">{{ copied ? 'Kopiert ✓' : 'Kopieren' }}</button>
+    </div>
+    <p class="faint small" style="margin: 0">
+      Tipp: QR-Code oder Link in Signatur, Website oder Nachrichtenaustausch einbauen.
+    </p>
+  </GlassCard>
+</template>
+
+<style scoped>
+.link-row { flex-wrap: wrap; }
+.link {
+  padding: 12px 16px;
+  font-size: 14px;
+  overflow-x: auto;
+  white-space: nowrap;
+  color: var(--accent);
+}
+</style>
diff --git a/frontend/src/env.d.ts b/frontend/src/env.d.ts
new file mode 100644
index 0000000..323c78a
--- /dev/null
+++ b/frontend/src/env.d.ts
@@ -0,0 +1,7 @@
+/// <reference types="vite/client" />
+
+declare module '*.vue' {
+  import type { DefineComponent } from 'vue'
+  const component: DefineComponent<{}, {}, any>
+  export default component
+}
diff --git a/frontend/src/lib/api.ts b/frontend/src/lib/api.ts
new file mode 100644
index 0000000..a456aa5
--- /dev/null
+++ b/frontend/src/lib/api.ts
@@ -0,0 +1,109 @@
+import type { Booking, Connection, PublicInfo, User } from './types'
+
+const TOKEN_KEY = 'wannpassts_token'
+
+export class ApiError extends Error {
+  status: number
+  constructor(message: string, status: number) {
+    super(message)
+    this.status = status
+  }
+}
+
+export function getToken(): string | null {
+  return localStorage.getItem(TOKEN_KEY)
+}
+export function setToken(token: string) {
+  localStorage.setItem(TOKEN_KEY, token)
+}
+export function clearToken() {
+  localStorage.removeItem(TOKEN_KEY)
+}
+
+async function request<T>(method: string, path: string, body?: unknown): Promise<T> {
+  const headers: Record<string, string> = {}
+  if (body !== undefined) headers['Content-Type'] = 'application/json'
+  const token = getToken()
+  if (token) headers['Authorization'] = `Bearer ${token}`
+
+  let res: Response
+  try {
+    res = await fetch('/api' + path, {
+      method,
+      headers,
+      body: body !== undefined ? JSON.stringify(body) : undefined,
+    })
+  } catch {
+    throw new ApiError('Server nicht erreichbar – läuft das Backend?', 0)
+  }
+
+  if (res.status === 204) return undefined as T
+  let data: any = null
+  try {
+    data = await res.json()
+  } catch {
+    /* leere Antwort */
+  }
+  if (!res.ok) {
+    throw new ApiError(data?.error ?? `Fehler ${res.status}`, res.status)
+  }
+  return data as T
+}
+
+export const api = {
+  // Auth
+  register(payload: { email: string; password: string; name: string; timezone?: string }) {
+    return request<{ token: string; user: User }>('POST', '/auth/register', payload)
+  },
+  login(payload: { email: string; password: string }) {
+    return request<{ token: string; user: User }>('POST', '/auth/login', payload)
+  },
+  me() {
+    return request<{ user: User }>('GET', '/me')
+  },
+  updateMe(payload: Partial<Pick<User, 'name' | 'timezone' | 'slot_minutes' | 'day_start_min' | 'day_end_min' | 'horizon_days'>> & { durations?: number[]; weekdays?: number[] }) {
+    return request<{ user: User }>('PATCH', '/me', payload)
+  },
+  regenSlug() {
+    return request<{ user: User }>('POST', '/me/slug')
+  },
+
+  // Kalender
+  connections() {
+    return request<Connection[]>('GET', '/calendars')
+  },
+  deleteConnection(id: number) {
+    return request<void>('DELETE', `/calendars/${id}`)
+  },
+  connectCalDAV(payload: { server_url: string; username: string; password: string; calendar_path?: string; display_name?: string }) {
+    return request<Connection>('POST', '/calendars/caldav', payload)
+  },
+  connectICS(payload: { url: string; display_name?: string }) {
+    return request<Connection>('POST', '/calendars/ics', payload)
+  },
+  googleStart() {
+    return request<{ url: string }>('GET', '/calendars/google/start')
+  },
+  syncNow() {
+    return request<Connection[]>('POST', '/calendars/sync')
+  },
+
+  // Anfragen
+  bookings() {
+    return request<Booking[]>('GET', '/bookings')
+  },
+  acceptBooking(id: number) {
+    return request<Booking>('POST', `/bookings/${id}/accept`)
+  },
+  declineBooking(id: number) {
+    return request<Booking>('POST', `/bookings/${id}/decline`)
+  },
+
+  // Öffentliche Buchungsseite
+  publicInfo(slug: string) {
+    return request<PublicInfo>('GET', `/public/${slug}`)
+  },
+  createBooking(slug: string, payload: { start: string; duration_minutes: number; name: string; email: string; message?: string }) {
+    return request<{ id: number; status: string }>('POST', `/public/${slug}/bookings`, payload)
+  },
+}
diff --git a/frontend/src/lib/types.ts b/frontend/src/lib/types.ts
new file mode 100644
index 0000000..d92d754
--- /dev/null
+++ b/frontend/src/lib/types.ts
@@ -0,0 +1,46 @@
+export interface User {
+  id: number
+  email: string
+  name: string
+  slug: string
+  timezone: string
+  slot_minutes: number
+  day_start_min: number
+  day_end_min: number
+  horizon_days: number
+  durations: number[]
+  weekdays: number[]
+  created_ts: number
+}
+
+export interface Connection {
+  id: number
+  provider: 'google' | 'caldav' | 'ics'
+  display_name: string
+  last_synced_ts: number | null
+  last_error: string | null
+  created_ts: number
+}
+
+export interface Booking {
+  id: number
+  start: string
+  end: string
+  requester_name: string
+  requester_email: string
+  message: string
+  status: 'pending' | 'accepted' | 'declined'
+  created_ts: number
+}
+
+export interface PublicInfo {
+  name: string
+  timezone: string
+  slot_minutes: number
+  day_start_min: number
+  day_end_min: number
+  horizon_days: number
+  durations: number[]
+  weekdays: number[]
+  busy: { start: string; end: string }[]
+}
diff --git a/frontend/src/lib/tz.ts b/frontend/src/lib/tz.ts
new file mode 100644
index 0000000..da8dfdb
--- /dev/null
+++ b/frontend/src/lib/tz.ts
@@ -0,0 +1,90 @@
+// Zeitzonen-Helfer: Wanduhrzeiten in einer Zielzone ↔ UTC-Epoch-Millisekunden.
+
+const partsCache = new Map<string, Intl.DateTimeFormat>()
+
+function tzPartsFmt(tz: string): Intl.DateTimeFormat {
+  let f = partsCache.get(tz)
+  if (!f) {
+    f = new Intl.DateTimeFormat('en-US', {
+      timeZone: tz,
+      hourCycle: 'h23',
+      year: 'numeric',
+      month: '2-digit',
+      day: '2-digit',
+      hour: '2-digit',
+      minute: '2-digit',
+      second: '2-digit',
+      weekday: 'short',
+    })
+    partsCache.set(tz, f)
+  }
+  return f
+}
+
+export interface ZonedParts {
+  year: number
+  month: number // 1–12
+  day: number
+  hour: number
+  minute: number
+  weekday: number // ISO: Mo=1 … So=7
+  minuteOfDay: number
+}
+
+const weekdayMap: Record<string, number> = { Mon: 1, Tue: 2, Wed: 3, Thu: 4, Fri: 5, Sat: 6, Sun: 7 }
+
+export function partsInTz(date: Date, tz: string): ZonedParts {
+  const parts = tzPartsFmt(tz).formatToParts(date)
+  const get = (type: string) => parts.find((p) => p.type === type)?.value ?? '0'
+  const hour = +get('hour') % 24
+  const minute = +get('minute')
+  return {
+    year: +get('year'),
+    month: +get('month'),
+    day: +get('day'),
+    hour,
+    minute,
+    weekday: weekdayMap[get('weekday')] ?? 1,
+    minuteOfDay: hour * 60 + minute,
+  }
+}
+
+/** Offset der Zone zum Zeitpunkt (ms), z. B. +2h für MESZ. */
+export function tzOffsetMs(date: Date, tz: string): number {
+  const p = partsInTz(date, tz)
+  const asUtc = Date.UTC(p.year, p.month - 1, p.day, p.hour, p.minute, date.getUTCSeconds())
+  return asUtc - date.getTime()
+}
+
+/** Wanduhrzeit (y, mo 1–12, d, h, min) in Zone tz → UTC-Epoch-Millisekunden. */
+export function zonedToUtc(year: number, month: number, day: number, hour: number, minute: number, tz: string): number {
+  const naive = Date.UTC(year, month - 1, day, hour, minute, 0)
+  let ts = naive
+  for (let i = 0; i < 2; i++) {
+    ts = naive - tzOffsetMs(new Date(ts), tz)
+  }
+  return ts
+}
+
+export function formatTime(tsMs: number, tz: string): string {
+  return new Intl.DateTimeFormat('de-DE', { timeZone: tz, hour: '2-digit', minute: '2-digit' }).format(new Date(tsMs))
+}
+
+export function formatDayShort(tsMs: number, tz: string): string {
+  return new Intl.DateTimeFormat('de-DE', { timeZone: tz, weekday: 'short', day: '2-digit', month: 'short' }).format(new Date(tsMs))
+}
+
+export function formatRange(startISO: string, endISO: string, tz: string): string {
+  const day = formatDayShort(new Date(startISO).getTime(), tz)
+  const t1 = formatTime(new Date(startISO).getTime(), tz)
+  const t2 = formatTime(new Date(endISO).getTime(), tz)
+  return `${day} · ${t1}–${t2} Uhr`
+}
+
+export function guessTimezone(): string {
+  try {
+    return Intl.DateTimeFormat().resolvedOptions().timeZone || 'Europe/Berlin'
+  } catch {
+    return 'Europe/Berlin'
+  }
+}
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
new file mode 100644
index 0000000..1c85907
--- /dev/null
+++ b/frontend/src/main.ts
@@ -0,0 +1,10 @@
+import { createApp } from 'vue'
+import { createPinia } from 'pinia'
+import App from './App.vue'
+import router from './router'
+import './styles/main.css'
+
+const app = createApp(App)
+app.use(createPinia())
+app.use(router)
+app.mount('#app')
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
new file mode 100644
index 0000000..300618b
--- /dev/null
+++ b/frontend/src/router/index.ts
@@ -0,0 +1,30 @@
+import { createRouter, createWebHistory } from 'vue-router'
+import { getToken } from '../lib/api'
+import LandingView from '../views/LandingView.vue'
+import LoginView from '../views/LoginView.vue'
+import RegisterView from '../views/RegisterView.vue'
+import DashboardView from '../views/DashboardView.vue'
+import BookingView from '../views/BookingView.vue'
+
+const router = createRouter({
+  history: createWebHistory(),
+  routes: [
+    { path: '/', name: 'landing', component: LandingView },
+    { path: '/login', name: 'login', component: LoginView },
+    { path: '/register', name: 'register', component: RegisterView },
+    { path: '/app', name: 'dashboard', component: DashboardView, meta: { requiresAuth: true } },
+    { path: '/b/:slug', name: 'booking', component: BookingView },
+    { path: '/:pathMatch(.*)*', redirect: '/' },
+  ],
+})
+
+router.beforeEach((to) => {
+  if (to.meta.requiresAuth && !getToken()) {
+    return { name: 'login', query: { redirect: to.fullPath } }
+  }
+  if ((to.name === 'login' || to.name === 'register' || to.name === 'landing') && getToken()) {
+    return { name: 'dashboard' }
+  }
+})
+
+export default router
diff --git a/frontend/src/stores/auth.ts b/frontend/src/stores/auth.ts
new file mode 100644
index 0000000..63f54cb
--- /dev/null
+++ b/frontend/src/stores/auth.ts
@@ -0,0 +1,47 @@
+import { ref } from 'vue'
+import { defineStore } from 'pinia'
+import { api, clearToken, getToken, setToken } from '../lib/api'
+import type { User } from '../lib/types'
+
+export const useAuth = defineStore('auth', () => {
+  const user = ref<User | null>(null)
+  const ready = ref(false)
+
+  async function init() {
+    if (!getToken()) {
+      ready.value = true
+      return
+    }
+    try {
+      const res = await api.me()
+      user.value = res.user
+    } catch {
+      clearToken()
+    } finally {
+      ready.value = true
+    }
+  }
+
+  async function login(email: string, password: string) {
+    const res = await api.login({ email, password })
+    setToken(res.token)
+    user.value = res.user
+  }
+
+  async function register(email: string, password: string, name: string, timezone: string) {
+    const res = await api.register({ email, password, name, timezone })
+    setToken(res.token)
+    user.value = res.user
+  }
+
+  function setUser(u: User) {
+    user.value = u
+  }
+
+  function logout() {
+    clearToken()
+    user.value = null
+  }
+
+  return { user, ready, init, login, register, setUser, logout }
+})
diff --git a/frontend/src/stores/toast.ts b/frontend/src/stores/toast.ts
new file mode 100644
index 0000000..827bb74
--- /dev/null
+++ b/frontend/src/stores/toast.ts
@@ -0,0 +1,27 @@
+import { ref } from 'vue'
+import { defineStore } from 'pinia'
+
+export interface Toast {
+  id: number
+  message: string
+  kind: 'ok' | 'error' | 'info'
+}
+
+let nextId = 1
+
+export const useToast = defineStore('toast', () => {
+  const toasts = ref<Toast[]>([])
+
+  function push(message: string, kind: Toast['kind'] = 'info') {
+    const id = nextId++
+    toasts.value.push({ id, message, kind })
+    setTimeout(() => {
+      toasts.value = toasts.value.filter((t) => t.id !== id)
+    }, 4500)
+  }
+
+  const ok = (m: string) => push(m, 'ok')
+  const error = (m: string) => push(m, 'error')
+
+  return { toasts, push, ok, error }
+})
diff --git a/frontend/src/styles/main.css b/frontend/src/styles/main.css
new file mode 100644
index 0000000..abff517
--- /dev/null
+++ b/frontend/src/styles/main.css
@@ -0,0 +1,324 @@
+/* ─── WannPassts · Liquid Glass Dark ──────────────────────────────────────── */
+
+:root {
+  --bg-0: #05070c;
+  --bg-1: #0a0e18;
+  --text: #eef1f8;
+  --text-muted: rgba(238, 241, 248, 0.58);
+  --text-faint: rgba(238, 241, 248, 0.34);
+  --border: rgba(255, 255, 255, 0.13);
+  --border-soft: rgba(255, 255, 255, 0.08);
+  --accent: #7db0ff;
+  --accent-2: #b78cff;
+  --accent-3: #6fe3c4;
+  --danger: #ff7a8a;
+  --ok: #46e0a5;
+  --radius-lg: 24px;
+  --radius-md: 16px;
+  --radius-sm: 12px;
+  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+}
+
+* { box-sizing: border-box; }
+
+html, body {
+  margin: 0;
+  padding: 0;
+  min-height: 100%;
+}
+
+body {
+  font-family: var(--font);
+  color: var(--text);
+  background:
+    radial-gradient(1200px 800px at 85% -10%, rgba(125, 176, 255, 0.10), transparent 60%),
+    radial-gradient(1000px 700px at -10% 30%, rgba(183, 140, 255, 0.09), transparent 55%),
+    radial-gradient(900px 600px at 50% 110%, rgba(111, 227, 196, 0.06), transparent 60%),
+    linear-gradient(180deg, var(--bg-1), var(--bg-0));
+  background-attachment: fixed;
+  -webkit-font-smoothing: antialiased;
+  letter-spacing: 0.01em;
+}
+
+#app { min-height: 100vh; }
+
+/* Farbliche "Orbs" hinter allem – geben dem Glass etwas zum Brechen */
+.bg-scene { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
+.orb {
+  position: absolute;
+  border-radius: 50%;
+  filter: blur(110px);
+  opacity: 0.45;
+  animation: orb-drift 26s ease-in-out infinite alternate;
+}
+.orb-1 { width: 46vw; height: 46vw; left: -10vw; top: -14vh; background: radial-gradient(circle, #2b5cc4, transparent 70%); }
+.orb-2 { width: 40vw; height: 40vw; right: -8vw; top: 22vh; background: radial-gradient(circle, #6d3fb8, transparent 70%); animation-delay: -8s; }
+.orb-3 { width: 34vw; height: 34vw; left: 28vw; bottom: -18vh; background: radial-gradient(circle, #1a7f68, transparent 70%); animation-delay: -16s; }
+
+@keyframes orb-drift {
+  from { transform: translate3d(0, 0, 0) scale(1); }
+  to   { transform: translate3d(6vw, 5vh, 0) scale(1.12); }
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .orb { animation: none; }
+  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
+}
+
+/* ─── Glass-Bausteine ─────────────────────────────────────────────────────── */
+
+.glass {
+  background: linear-gradient(150deg, rgba(255, 255, 255, 0.085), rgba(255, 255, 255, 0.028));
+  backdrop-filter: blur(26px) saturate(170%);
+  -webkit-backdrop-filter: blur(26px) saturate(170%);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-lg);
+  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.10);
+}
+
+.glass-soft {
+  background: rgba(255, 255, 255, 0.04);
+  border: 1px solid var(--border-soft);
+  border-radius: var(--radius-md);
+  backdrop-filter: blur(12px);
+  -webkit-backdrop-filter: blur(12px);
+}
+
+/* ─── Layout ──────────────────────────────────────────────────────────────── */
+
+.page {
+  max-width: 1060px;
+  margin: 0 auto;
+  padding: 24px 20px 80px;
+}
+
+.row { display: flex; gap: 12px; align-items: center; }
+.col { display: flex; flex-direction: column; gap: 12px; }
+.grow { flex: 1; }
+.muted { color: var(--text-muted); }
+.faint { color: var(--text-faint); }
+.small { font-size: 13px; }
+
+/* ─── Buttons ─────────────────────────────────────────────────────────────── */
+
+.btn {
+  appearance: none;
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  background: linear-gradient(150deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.04));
+  color: var(--text);
+  font: 600 14px/1 var(--font);
+  padding: 11px 20px;
+  cursor: pointer;
+  backdrop-filter: blur(14px);
+  -webkit-backdrop-filter: blur(14px);
+  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease, opacity 0.15s ease;
+}
+.btn:hover { transform: translateY(-1px); border-color: rgba(255, 255, 255, 0.24); box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35); }
+.btn:active { transform: translateY(0); }
+.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
+
+.btn-primary {
+  background: linear-gradient(135deg, var(--accent), var(--accent-2));
+  border: none;
+  color: #071018;
+  box-shadow: 0 10px 34px rgba(125, 176, 255, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.35);
+}
+.btn-primary:hover { box-shadow: 0 14px 40px rgba(125, 176, 255, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.35); }
+
+.btn-danger {
+  border-color: rgba(255, 122, 138, 0.4);
+  color: var(--danger);
+  background: rgba(255, 122, 138, 0.08);
+}
+.btn-danger:hover { border-color: rgba(255, 122, 138, 0.7); box-shadow: 0 8px 24px rgba(255, 122, 138, 0.18); }
+
+.btn-sm { padding: 8px 14px; font-size: 13px; }
+
+/* ─── Formulare ───────────────────────────────────────────────────────────── */
+
+label.field { display: flex; flex-direction: column; gap: 7px; }
+label.field > span { font-size: 13px; color: var(--text-muted); font-weight: 500; }
+
+.input, select.input, textarea.input {
+  width: 100%;
+  background: rgba(255, 255, 255, 0.05);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  color: var(--text);
+  font: 500 14px/1.4 var(--font);
+  padding: 11px 14px;
+  outline: none;
+  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
+}
+.input:focus {
+  border-color: rgba(125, 176, 255, 0.65);
+  box-shadow: 0 0 0 3px rgba(125, 176, 255, 0.18);
+  background: rgba(255, 255, 255, 0.07);
+}
+.input::placeholder { color: var(--text-faint); }
+select.input option { background: #10141f; color: var(--text); }
+textarea.input { resize: vertical; min-height: 84px; }
+
+/* ─── Badges & Chips ──────────────────────────────────────────────────────── */
+
+.badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 12px;
+  font-weight: 600;
+  padding: 4px 11px;
+  border-radius: 999px;
+  border: 1px solid var(--border);
+  background: rgba(255, 255, 255, 0.05);
+  color: var(--text-muted);
+}
+.badge-pending { border-color: rgba(125, 176, 255, 0.45); color: var(--accent); background: rgba(125, 176, 255, 0.10); }
+.badge-accepted { border-color: rgba(70, 224, 165, 0.45); color: var(--ok); background: rgba(70, 224, 165, 0.10); }
+.badge-declined { border-color: rgba(255, 122, 138, 0.4); color: var(--danger); background: rgba(255, 122, 138, 0.08); }
+
+/* ─── Tabs ────────────────────────────────────────────────────────────────── */
+
+.tabs {
+  display: flex;
+  gap: 6px;
+  padding: 6px;
+  border-radius: 999px;
+  border: 1px solid var(--border-soft);
+  background: rgba(255, 255, 255, 0.035);
+  backdrop-filter: blur(18px);
+  -webkit-backdrop-filter: blur(18px);
+  overflow-x: auto;
+  scrollbar-width: none;
+}
+.tabs::-webkit-scrollbar { display: none; }
+.tab {
+  flex: 1;
+  white-space: nowrap;
+  appearance: none;
+  border: none;
+  background: transparent;
+  color: var(--text-muted);
+  font: 600 14px/1 var(--font);
+  padding: 10px 18px;
+  border-radius: 999px;
+  cursor: pointer;
+  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
+}
+.tab:hover { color: var(--text); }
+.tab.active {
+  color: var(--text);
+  background: linear-gradient(150deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.06));
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12), 0 6px 18px rgba(0, 0, 0, 0.3);
+}
+
+/* ─── Toasts ──────────────────────────────────────────────────────────────── */
+
+.toasts {
+  position: fixed;
+  bottom: 22px;
+  left: 50%;
+  transform: translateX(-50%);
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  z-index: 100;
+  width: min(480px, calc(100vw - 32px));
+}
+.toast {
+  padding: 13px 18px;
+  font-size: 14px;
+  font-weight: 500;
+  animation: toast-in 0.25s ease;
+}
+.toast-ok { border-color: rgba(70, 224, 165, 0.5); }
+.toast-error { border-color: rgba(255, 122, 138, 0.5); }
+@keyframes toast-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
+
+/* ─── Slot-Chips (Buchungsseite) ──────────────────────────────────────────── */
+
+.slot-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
+  gap: 10px;
+}
+.slot-chip {
+  appearance: none;
+  border: 1px solid var(--border-soft);
+  border-radius: var(--radius-sm);
+  background: rgba(255, 255, 255, 0.04);
+  color: var(--text-muted);
+  font: 600 14px/1 var(--font);
+  padding: 12px 0;
+  cursor: pointer;
+  transition: all 0.13s ease;
+}
+.slot-chip:hover:not(:disabled) {
+  color: var(--text);
+  border-color: rgba(125, 176, 255, 0.5);
+  background: rgba(125, 176, 255, 0.10);
+}
+.slot-chip.selected {
+  color: #071018;
+  background: linear-gradient(135deg, var(--accent), var(--accent-2));
+  border-color: transparent;
+  box-shadow: 0 8px 26px rgba(125, 176, 255, 0.4);
+}
+.slot-chip:disabled { opacity: 0.28; cursor: not-allowed; text-decoration: line-through; }
+
+/* ─── Day-Picker ──────────────────────────────────────────────────────────── */
+
+.day-strip {
+  display: flex;
+  gap: 9px;
+  overflow-x: auto;
+  padding-bottom: 6px;
+  scrollbar-width: thin;
+}
+.day-chip {
+  appearance: none;
+  flex: 0 0 auto;
+  min-width: 74px;
+  border: 1px solid var(--border-soft);
+  border-radius: var(--radius-md);
+  background: rgba(255, 255, 255, 0.04);
+  color: var(--text-muted);
+  font-family: var(--font);
+  padding: 10px 8px;
+  cursor: pointer;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 3px;
+  transition: all 0.13s ease;
+}
+.day-chip:hover { border-color: var(--border); color: var(--text); }
+.day-chip.selected {
+  color: var(--text);
+  border-color: rgba(125, 176, 255, 0.55);
+  background: linear-gradient(150deg, rgba(125, 176, 255, 0.16), rgba(183, 140, 255, 0.10));
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.1), 0 8px 24px rgba(0, 0, 0, 0.3);
+}
+.day-chip .wd { font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; }
+.day-chip .dom { font-size: 20px; font-weight: 700; color: inherit; }
+.day-chip .mon { font-size: 11px; }
+
+/* ─── Verschiedenes ───────────────────────────────────────────────────────── */
+
+.divider { height: 1px; background: var(--border-soft); border: none; margin: 4px 0; }
+
+.skeleton {
+  border-radius: var(--radius-md);
+  background: linear-gradient(100deg, rgba(255,255,255,0.04) 40%, rgba(255,255,255,0.09) 50%, rgba(255,255,255,0.04) 60%);
+  background-size: 200% 100%;
+  animation: shimmer 1.4s infinite;
+}
+@keyframes shimmer { to { background-position: -200% 0; } }
+
+.fade-enter-active, .fade-leave-active { transition: opacity 0.18s ease, transform 0.18s ease; }
+.fade-enter-from, .fade-leave-to { opacity: 0; transform: translateY(6px); }
+
+@media (max-width: 640px) {
+  .page { padding: 16px 14px 64px; }
+}
diff --git a/frontend/src/views/BookingView.vue b/frontend/src/views/BookingView.vue
new file mode 100644
index 0000000..45db4c2
--- /dev/null
+++ b/frontend/src/views/BookingView.vue
@@ -0,0 +1,309 @@
+<script setup lang="ts">
+import { computed, onMounted, ref, watch } from 'vue'
+import { useRoute } from 'vue-router'
+import { ApiError, api } from '../lib/api'
+import type { PublicInfo } from '../lib/types'
+import { useToast } from '../stores/toast'
+import { formatTime, partsInTz, zonedToUtc } from '../lib/tz'
+import LogoMark from '../components/LogoMark.vue'
+
+const route = useRoute()
+const toast = useToast()
+const slug = route.params.slug as string
+
+const info = ref<PublicInfo | null>(null)
+const notFound = ref(false)
+const loadError = ref('')
+
+interface Day {
+  y: number
+  m: number
+  d: number
+  weekday: number
+  key: string
+  weekdayLabel: string
+  monthLabel: string
+}
+
+const selectedDay = ref<number>(0)
+const duration = ref(30)
+const selectedSlot = ref<number | null>(null)
+const form = ref({ name: '', email: '', message: '' })
+const sending = ref(false)
+const done = ref(false)
+
+const days = computed<Day[]>(() => {
+  if (!info.value) return []
+  const tz = info.value.timezone
+  const out: Day[] = []
+  const now = new Date()
+  const today = partsInTz(now, tz)
+  for (let i = 0; i < info.value.horizon_days && out.length < 60; i++) {
+    // Datum in der Zielzone um i Tage verschieben: über UTC-Mitternacht laufen
+    const ts = zonedToUtc(today.year, today.month, today.day + i, 12, 0, tz)
+    const p = partsInTz(new Date(ts), tz)
+    if (!info.value.weekdays.includes(p.weekday)) continue
+    out.push({
+      y: p.year,
+      m: p.month,
+      d: p.day,
+      weekday: p.weekday,
+      key: `${p.year}-${p.month}-${p.day}`,
+      weekdayLabel: new Intl.DateTimeFormat('de-DE', { weekday: 'short' }).format(new Date(ts)),
+      monthLabel: new Intl.DateTimeFormat('de-DE', { month: 'short' }).format(new Date(ts)),
+    })
+  }
+  return out
+})
+
+const busyMs = computed<[number, number][]>(() =>
+  (info.value?.busy ?? []).map((b) => [new Date(b.start).getTime(), new Date(b.end).getTime()]),
+)
+
+interface Slot {
+  ts: number
+  label: string
+  free: boolean
+}
+
+const LEAD_MS = 10 * 60 * 1000 // min. 10 Minuten Vorlauf
+
+const slots = computed<Slot[]>(() => {
+  const i = info.value
+  const day = days.value[selectedDay.value]
+  if (!i || !day) return []
+  const tz = i.timezone
+  const out: Slot[] = []
+  for (let m = i.day_start_min; m + duration.value <= i.day_end_min; m += i.slot_minutes) {
+    const ts = zonedToUtc(day.y, day.m, day.d, Math.floor(m / 60), m % 60, tz)
+    const end = ts + duration.value * 60_000
+    const free =
+      ts > Date.now() + LEAD_MS && !busyMs.value.some(([bStart, bEnd]) => ts < bEnd && bStart < end)
+    out.push({ ts, label: formatTime(ts, tz), free })
+  }
+  return out
+})
+
+const selectedDayLabel = computed(() => {
+  const day = days.value[selectedDay.value]
+  if (!day) return ''
+  const date = new Intl.DateTimeFormat('de-DE', { weekday: 'long', day: 'numeric', month: 'long' }).format(
+    new Date(day.y, day.m - 1, day.d),
+  )
+  return date
+})
+
+watch(duration, () => (selectedSlot.value = null))
+watch(selectedDay, () => (selectedSlot.value = null))
+
+const selectedSlotLabel = computed(() => {
+  if (selectedSlot.value == null || !info.value) return ''
+  const tz = info.value.timezone
+  return `${formatTime(selectedSlot.value, tz)} – ${formatTime(selectedSlot.value + duration.value * 60_000, tz)} Uhr`
+})
+
+async function submit() {
+  if (selectedSlot.value == null) return
+  sending.value = true
+  try {
+    await api.createBooking(slug, {
+      start: new Date(selectedSlot.value).toISOString().replace('.000', ''),
+      duration_minutes: duration.value,
+      name: form.value.name,
+      email: form.value.email,
+      message: form.value.message || undefined,
+    })
+    done.value = true
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Senden fehlgeschlagen')
+    if (e instanceof ApiError && e.status === 409) {
+      const res = await api.publicInfo(slug).catch(() => null)
+      if (res) info.value = res
+      selectedSlot.value = null
+    }
+  } finally {
+    sending.value = false
+  }
+}
+
+onMounted(async () => {
+  try {
+    info.value = await api.publicInfo(slug)
+    if (info.value.durations.length > 0) {
+      duration.value = info.value.durations[Math.floor(info.value.durations.length / 2)]
+    }
+  } catch (e) {
+    if (e instanceof ApiError && e.status === 404) notFound.value = true
+    else loadError.value = e instanceof ApiError ? e.message : 'Laden fehlgeschlagen'
+  }
+})
+</script>
+
+<template>
+  <main class="page booking">
+    <!-- Fehlerzustände -->
+    <div v-if="notFound" class="glass state">
+      <LogoMark />
+      <h1>Seite nicht gefunden</h1>
+      <p class="muted">Dieser Buchungslink existiert nicht (mehr).</p>
+    </div>
+    <div v-else-if="loadError" class="glass state">
+      <h1>Hoppla</h1>
+      <p class="muted">{{ loadError }}</p>
+    </div>
+
+    <!-- Erfolg -->
+    <div v-else-if="done" class="glass state">
+      <div class="big-check">✓</div>
+      <h1>Anfrage gesendet!</h1>
+      <p class="muted">
+        {{ info?.name }} erhält deine Anfrage für
+        <strong>{{ selectedDayLabel }}</strong> um <strong>{{ selectedSlotLabel }}</strong>
+        und kann sie bestätigen.
+      </p>
+      <p class="faint small">Du hörst dann per E-Mail oder persönlich von {{ info?.name }}.</p>
+    </div>
+
+    <!-- Laden -->
+    <div v-else-if="!info" class="glass state">
+      <div class="skeleton" style="width: 260px; height: 40px"></div>
+      <div class="skeleton" style="width: 320px; height: 120px"></div>
+    </div>
+
+    <!-- Buchung -->
+    <template v-else>
+      <header class="glass head">
+        <div class="row">
+          <LogoMark />
+          <div>
+            <h1>Buchung bei {{ info.name }}</h1>
+            <p class="muted small" style="margin: 2px 0 0">
+              Wähle einen freien Zeitraum. Siehst nur <em>frei</em> oder <em>belegt</em> –
+              niemals die konkreten Termine.
+            </p>
+          </div>
+        </div>
+        <div class="legend small">
+          <span class="dot ok"></span> frei &amp; buchbar
+          <span class="dot busy"></span> belegt
+        </div>
+      </header>
+
+      <section class="glass block">
+        <h2>1 · Tag wählen</h2>
+        <div class="day-strip">
+          <button
+            v-for="(d, i) in days"
+            :key="d.key"
+            class="day-chip"
+            :class="{ selected: selectedDay === i }"
+            @click="selectedDay = i"
+          >
+            <span class="wd">{{ d.weekdayLabel }}</span>
+            <span class="dom">{{ d.d }}</span>
+            <span class="mon">{{ d.monthLabel }}</span>
+          </button>
+        </div>
+      </section>
+
+      <section class="glass block">
+        <div class="row block-head">
+          <h2 class="grow">2 · Freien Zeitraum wählen</h2>
+          <label class="row small" style="gap: 8px">
+            <span class="muted">Dauer</span>
+            <select v-model.number="duration" class="input" style="width: auto">
+              <option v-for="d in info.durations" :key="d" :value="d">{{ d }} Min.</option>
+            </select>
+          </label>
+        </div>
+        <p class="muted small" style="margin: -6px 0 0">{{ selectedDayLabel }} · Zeitzone {{ info.timezone }}</p>
+
+        <div v-if="slots.length === 0" class="muted small">An diesem Tag sind keine Zeiten buchbar.</div>
+        <div v-else-if="slots.every((s) => !s.free)" class="muted small">
+          Für {{ duration }} Min. ist an diesem Tag leider nichts mehr frei – anderer Tag oder andere Dauer?
+        </div>
+        <div v-else class="slot-grid">
+          <button
+            v-for="s in slots"
+            :key="s.ts"
+            class="slot-chip"
+            :class="{ selected: selectedSlot === s.ts }"
+            :disabled="!s.free"
+            @click="selectedSlot = s.ts"
+          >
+            {{ s.label }}
+          </button>
+        </div>
+      </section>
+
+      <section class="glass block">
+        <h2>3 · Anfrage senden</h2>
+        <p v-if="selectedSlot != null" class="chosen">
+          🗓 {{ selectedDayLabel }} · <strong>{{ selectedSlotLabel }}</strong> ({{ duration }} Min.)
+        </p>
+        <p v-else class="muted small" style="margin: 0">Zuerst oben einen freien Zeitraum auswählen.</p>
+
+        <form v-if="selectedSlot != null" class="form" @submit.prevent="submit">
+          <div class="form-grid">
+            <label class="field">
+              <span>Dein Name</span>
+              <input v-model="form.name" required maxlength="100" class="input" placeholder="Erika Musterfrau" />
+            </label>
+            <label class="field">
+              <span>Deine E-Mail</span>
+              <input v-model="form.email" type="email" required maxlength="254" class="input" placeholder="du@beispiel.de" />
+            </label>
+          </div>
+          <label class="field">
+            <span>Nachricht (optional)</span>
+            <textarea v-model="form.message" maxlength="2000" class="input" placeholder="Worum geht's?"></textarea>
+          </label>
+          <button class="btn btn-primary" type="submit" :disabled="sending">
+            {{ sending ? 'Senden…' : 'Buchungsanfrage senden' }}
+          </button>
+        </form>
+      </section>
+
+      <footer class="row center faint small" style="justify-content: center">
+        <LogoMark />&nbsp; WannPassts
+      </footer>
+    </template>
+  </main>
+</template>
+
+<style scoped>
+.booking { display: flex; flex-direction: column; gap: 16px; max-width: 780px; }
+.state {
+  margin-top: 18vh;
+  padding: 48px 36px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 12px;
+  text-align: center;
+}
+.state h1 { margin: 0; font-size: 26px; }
+.big-check {
+  width: 72px;
+  height: 72px;
+  border-radius: 50%;
+  display: grid;
+  place-items: center;
+  font-size: 34px;
+  color: #071018;
+  background: linear-gradient(135deg, var(--ok), var(--accent-3));
+  box-shadow: 0 14px 44px rgba(70, 224, 165, 0.4);
+}
+.head { padding: 22px 24px; display: flex; flex-direction: column; gap: 12px; }
+.head h1 { margin: 0; font-size: 22px; }
+.legend { display: flex; align-items: center; gap: 8px; color: var(--text-muted); }
+.dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
+.dot.ok { background: var(--ok); box-shadow: 0 0 10px rgba(70, 224, 165, 0.7); }
+.dot.busy { background: var(--danger); box-shadow: 0 0 10px rgba(255, 122, 138, 0.6); }
+.block { padding: 20px 24px; display: flex; flex-direction: column; gap: 14px; }
+.block h2 { margin: 0; font-size: 15px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-muted); }
+.block-head { align-items: baseline; }
+.chosen { margin: 0; font-size: 15px; }
+.form { display: flex; flex-direction: column; gap: 14px; }
+.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
+</style>
diff --git a/frontend/src/views/DashboardView.vue b/frontend/src/views/DashboardView.vue
new file mode 100644
index 0000000..2bef300
--- /dev/null
+++ b/frontend/src/views/DashboardView.vue
@@ -0,0 +1,149 @@
+<script setup lang="ts">
+import { onMounted, ref } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import { useAuth } from '../stores/auth'
+import { useToast } from '../stores/toast'
+import LogoMark from '../components/LogoMark.vue'
+import ShareLinkCard from '../components/ShareLinkCard.vue'
+import SectionConnections from '../components/SectionConnections.vue'
+import SectionRequests from '../components/SectionRequests.vue'
+import SectionSettings from '../components/SectionSettings.vue'
+
+const auth = useAuth()
+const toast = useToast()
+const route = useRoute()
+const router = useRouter()
+
+const tab = ref<'overview' | 'requests' | 'calendars' | 'settings'>('overview')
+const loading = ref(true)
+
+const tabs = [
+  { value: 'overview', label: 'Übersicht' },
+  { value: 'requests', label: 'Anfragen' },
+  { value: 'calendars', label: 'Kalender' },
+  { value: 'settings', label: 'Einstellungen' },
+] as const
+
+onMounted(async () => {
+  await auth.init()
+  if (!auth.user) {
+    auth.logout()
+    router.push({ name: 'login' })
+    return
+  }
+  loading.value = false
+
+  if (route.query.google === 'ok') {
+    toast.ok('Google Kalender verbunden 🎉')
+    tab.value = 'calendars'
+  } else if (route.query.google === 'error') {
+    toast.error('Google-Verbindung fehlgeschlagen: ' + (route.query.reason || 'unbekannter Fehler'))
+    tab.value = 'calendars'
+  } else if (typeof route.query.tab === 'string') {
+    tab.value = route.query.tab as typeof tab.value
+  }
+  if (Object.keys(route.query).length > 0) {
+    router.replace({ query: {} })
+  }
+})
+
+function logout() {
+  auth.logout()
+  router.push('/')
+}
+</script>
+
+<template>
+  <main class="page dash" v-if="!loading && auth.user">
+    <header class="glass dash-header">
+      <div class="row">
+        <LogoMark />
+        <strong class="brand">WannPassts</strong>
+      </div>
+      <div class="row">
+        <span class="muted small hide-sm">{{ auth.user.email }}</span>
+        <button class="btn btn-sm" @click="logout">Abmelden</button>
+      </div>
+    </header>
+
+    <nav class="tabs">
+      <button
+        v-for="t in tabs"
+        :key="t.value"
+        class="tab"
+        :class="{ active: tab === t.value }"
+        @click="tab = t.value"
+      >
+        {{ t.label }}
+      </button>
+    </nav>
+
+    <div v-if="tab === 'overview'" class="col overview">
+      <ShareLinkCard />
+      <div class="overview-grid">
+        <router-link :to="{ query: { tab: 'calendars' } }" class="glass tile" @click="tab = 'calendars'">
+          <span class="tile-icon">📆</span>
+          <strong>Kalender verbinden</strong>
+          <span class="muted small">Google, iCloud/CalDAV oder ICS-Link hinzufügen</span>
+        </router-link>
+        <router-link :to="{ query: { tab: 'requests' } }" class="glass tile" @click="tab = 'requests'">
+          <span class="tile-icon">📨</span>
+          <strong>Anfragen prüfen</strong>
+          <span class="muted small">Buchungsanfragen annehmen oder ablehnen</span>
+        </router-link>
+        <router-link :to="{ query: { tab: 'settings' } }" class="glass tile" @click="tab = 'settings'">
+          <span class="tile-icon">⚙️</span>
+          <strong>Buchungsregeln</strong>
+          <span class="muted small">Zeitfenster, Dauern, Slot-Größe festlegen</span>
+        </router-link>
+      </div>
+      <section class="glass privacy">
+        <strong>🔒 Datenschutz by Design</strong>
+        <p class="muted small" style="margin: 6px 0 0">
+          Besucher deiner Buchungsseite sehen ausschließlich <em>frei</em> oder <em>belegt</em> –
+          niemals Titel, Ort oder Beschreibung deiner Termine. Google-Anbindungen nutzen die
+          FreeBusy-API, die strukturell keine Termindetails liefert.
+        </p>
+      </section>
+    </div>
+
+    <SectionRequests v-else-if="tab === 'requests'" />
+    <SectionConnections v-else-if="tab === 'calendars'" />
+    <SectionSettings v-else />
+  </main>
+
+  <main v-else class="page" style="display: flex; justify-content: center; padding-top: 20vh">
+    <div class="skeleton" style="width: 320px; height: 120px"></div>
+  </main>
+</template>
+
+<style scoped>
+.dash { display: flex; flex-direction: column; gap: 18px; }
+.dash-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 14px 20px;
+}
+.brand { font-size: 17px; letter-spacing: -0.01em; }
+.overview { gap: 18px; }
+.overview-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
+  gap: 14px;
+}
+.tile {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  padding: 22px;
+  text-decoration: none;
+  color: var(--text);
+  transition: transform 0.15s ease, border-color 0.15s ease;
+  cursor: pointer;
+}
+.tile:hover { transform: translateY(-2px); border-color: rgba(255, 255, 255, 0.24); }
+.tile-icon { font-size: 26px; }
+.privacy { padding: 20px 24px; }
+@media (max-width: 520px) { .hide-sm { display: none; } }
+</style>
diff --git a/frontend/src/views/LandingView.vue b/frontend/src/views/LandingView.vue
new file mode 100644
index 0000000..4f87c9c
--- /dev/null
+++ b/frontend/src/views/LandingView.vue
@@ -0,0 +1,102 @@
+<script setup lang="ts">
+import LogoMark from '../components/LogoMark.vue'
+import GlassCard from '../components/GlassCard.vue'
+</script>
+
+<template>
+  <main class="page landing">
+    <section class="hero glass">
+      <div class="hero-glow" aria-hidden="true"></div>
+      <LogoMark />
+      <h1>Wann<span class="grad">Passts</span></h1>
+      <p class="tagline">
+        Deine freien Zeiten – geteilt per Link.<br />
+        Verbinde deinen Kalender, lass andere buchen und gib dabei <strong>keine Termindetails</strong> preis.
+      </p>
+      <div class="row center">
+        <router-link to="/register" class="btn btn-primary">Kostenlos starten</router-link>
+        <router-link to="/login" class="btn">Anmelden</router-link>
+      </div>
+    </section>
+
+    <section class="features">
+      <GlassCard title="🔐 Kalender verbinden">
+        <p class="muted small">
+          Google Kalender, iCloud (CalDAV) oder jeder ICS-Link. WannPassts liest ausschließlich
+          <em>beschäftigt / frei</em> – Titel, Ort und Notizen bleiben auf deinem Gerät bzw. beim Anbieter.
+        </p>
+      </GlassCard>
+      <GlassCard title="🔗 Link teilen">
+        <p class="muted small">
+          Deine persönliche Buchungsseite zeigt nur freie und belegte Zeitfenster. Freunde, Kunden
+          und Kollegen wählen einen freien Slot und stellen eine Anfrage.
+        </p>
+      </GlassCard>
+      <GlassCard title="✅ Anfragen entscheiden">
+        <p class="muted small">
+          Anfragen landen in deinem Dashboard: annehmen oder ablehnen. Angenommene Zeiten werden
+          automatisch als belegt markiert – Doppelbuchungen werden verhindert.
+        </p>
+      </GlassCard>
+    </section>
+
+    <p class="faint small foot">Liquid Glass · Vue 3 + Go · Deine Termine bleiben deine Termine.</p>
+  </main>
+</template>
+
+<style scoped>
+.landing {
+  display: flex;
+  flex-direction: column;
+  gap: 22px;
+  justify-content: center;
+  min-height: 100vh;
+  padding-top: 6vh;
+}
+
+.hero {
+  position: relative;
+  overflow: hidden;
+  padding: 56px 32px 48px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 16px;
+  text-align: center;
+}
+.hero-glow {
+  position: absolute;
+  inset: -40%;
+  background: radial-gradient(600px 300px at 50% 0%, rgba(125, 176, 255, 0.16), transparent 70%);
+  pointer-events: none;
+}
+h1 {
+  margin: 6px 0 0;
+  font-size: clamp(40px, 7vw, 64px);
+  font-weight: 800;
+  letter-spacing: -0.02em;
+}
+.grad {
+  background: linear-gradient(120deg, var(--accent), var(--accent-2));
+  -webkit-background-clip: text;
+  background-clip: text;
+  color: transparent;
+}
+.tagline {
+  margin: 0;
+  max-width: 460px;
+  color: var(--text-muted);
+  line-height: 1.65;
+  font-size: 16px;
+}
+.row.center { justify-content: center; }
+
+.features {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
+  gap: 16px;
+}
+.foot { text-align: center; }
+
+a.btn { text-decoration: none; display: inline-block; }
+</style>
diff --git a/frontend/src/views/LoginView.vue b/frontend/src/views/LoginView.vue
new file mode 100644
index 0000000..3e32572
--- /dev/null
+++ b/frontend/src/views/LoginView.vue
@@ -0,0 +1,82 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import { ApiError } from '../lib/api'
+import { useAuth } from '../stores/auth'
+import { useToast } from '../stores/toast'
+import LogoMark from '../components/LogoMark.vue'
+
+const auth = useAuth()
+const toast = useToast()
+const router = useRouter()
+const route = useRoute()
+
+const email = ref('')
+const password = ref('')
+const busy = ref(false)
+
+async function submit() {
+  busy.value = true
+  try {
+    await auth.login(email.value, password.value)
+    toast.ok('Willkommen zurück!')
+    router.push((route.query.redirect as string) || '/app')
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Anmeldung fehlgeschlagen')
+  } finally {
+    busy.value = false
+  }
+}
+</script>
+
+<template>
+  <main class="page auth">
+    <form class="glass card" @submit.prevent="submit">
+      <div class="row" style="justify-content: center">
+        <LogoMark />
+      </div>
+      <h1>Willkommen zurück</h1>
+      <p class="muted small center">Melde dich an, um deine Buchungsseite zu verwalten.</p>
+
+      <label class="field">
+        <span>E-Mail</span>
+        <input v-model="email" type="email" required autocomplete="email" class="input" placeholder="du@beispiel.de" />
+      </label>
+      <label class="field">
+        <span>Passwort</span>
+        <input v-model="password" type="password" required autocomplete="current-password" class="input" placeholder="••••••••" />
+      </label>
+
+      <button class="btn btn-primary" type="submit" :disabled="busy || !email || !password">
+        {{ busy ? 'Anmelden…' : 'Anmelden' }}
+      </button>
+
+      <p class="muted small center">
+        Noch kein Konto?
+        <router-link to="/register">Jetzt registrieren</router-link>
+      </p>
+      <p class="small center"><router-link to="/">← Zur Startseite</router-link></p>
+    </form>
+  </main>
+</template>
+
+<style scoped>
+.auth {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.card {
+  width: min(420px, 100%);
+  padding: 34px 32px;
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+}
+.card p { margin: 0; }
+h1 { margin: 4px 0 0; font-size: 24px; text-align: center; }
+.center { text-align: center; }
+a { color: var(--accent); text-decoration: none; }
+a:hover { text-decoration: underline; }
+</style>
diff --git a/frontend/src/views/RegisterView.vue b/frontend/src/views/RegisterView.vue
new file mode 100644
index 0000000..eb64016
--- /dev/null
+++ b/frontend/src/views/RegisterView.vue
@@ -0,0 +1,90 @@
+<script setup lang="ts">
+import { ref } from 'vue'
+import { useRouter } from 'vue-router'
+import { ApiError } from '../lib/api'
+import { useAuth } from '../stores/auth'
+import { useToast } from '../stores/toast'
+import { guessTimezone } from '../lib/tz'
+import LogoMark from '../components/LogoMark.vue'
+
+const auth = useAuth()
+const toast = useToast()
+const router = useRouter()
+
+const name = ref('')
+const email = ref('')
+const password = ref('')
+const busy = ref(false)
+
+async function submit() {
+  if (password.value.length < 8) {
+    toast.error('Das Passwort braucht mindestens 8 Zeichen.')
+    return
+  }
+  busy.value = true
+  try {
+    await auth.register(email.value, password.value, name.value, guessTimezone())
+    toast.ok('Konto erstellt – willkommen bei WannPassts!')
+    router.push('/app')
+  } catch (e) {
+    toast.error(e instanceof ApiError ? e.message : 'Registrierung fehlgeschlagen')
+  } finally {
+    busy.value = false
+  }
+}
+</script>
+
+<template>
+  <main class="page auth">
+    <form class="glass card" @submit.prevent="submit">
+      <div class="row" style="justify-content: center">
+        <LogoMark />
+      </div>
+      <h1>Konto erstellen</h1>
+      <p class="muted small center">In zwei Minuten buchbar – ganz ohne Termine preiszugeben.</p>
+
+      <label class="field">
+        <span>Name (sehen Besucher deiner Buchungsseite)</span>
+        <input v-model="name" required maxlength="80" class="input" placeholder="Max Mustermann" />
+      </label>
+      <label class="field">
+        <span>E-Mail</span>
+        <input v-model="email" type="email" required autocomplete="email" class="input" placeholder="du@beispiel.de" />
+      </label>
+      <label class="field">
+        <span>Passwort (min. 8 Zeichen)</span>
+        <input v-model="password" type="password" required autocomplete="new-password" class="input" placeholder="••••••••" />
+      </label>
+
+      <button class="btn btn-primary" type="submit" :disabled="busy || !name || !email || !password">
+        {{ busy ? 'Wird erstellt…' : 'Konto erstellen' }}
+      </button>
+
+      <p class="muted small center">
+        Schon dabei? <router-link to="/login">Anmelden</router-link>
+      </p>
+      <p class="small center"><router-link to="/">← Zur Startseite</router-link></p>
+    </form>
+  </main>
+</template>
+
+<style scoped>
+.auth {
+  min-height: 100vh;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.card {
+  width: min(420px, 100%);
+  padding: 34px 32px;
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+}
+.card p { margin: 0; }
+h1 { margin: 4px 0 0; font-size: 24px; text-align: center; }
+.center { text-align: center; }
+a { color: var(--accent); text-decoration: none; }
+a:hover { text-decoration: underline; }
+</style>
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
new file mode 100644
index 0000000..6494f64
--- /dev/null
+++ b/frontend/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "module": "ESNext",
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "strict": true,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src/**/*.ts", "src/**/*.d.ts", "src/**/*.vue"]
+}
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
new file mode 100644
index 0000000..60f37c7
--- /dev/null
+++ b/frontend/vite.config.ts
@@ -0,0 +1,12 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+
+export default defineConfig({
+  plugins: [vue()],
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': { target: 'http://localhost:8080', changeOrigin: true },
+    },
+  },
+})