diff --git a/app/main.py b/app/main.py
index 30b334f..bef47a7 100644
--- a/app/main.py
+++ b/app/main.py
@@ -527,6 +527,82 @@ def download_calendar_ics(event_id: int, request: Request, db: Session = Depends
     )
 
 
+# --- EINKAUFS- & KASSEN-ZENTRALE (/einkauf) ---
+
+@app.get("/einkauf", response_class=HTMLResponse)
+def buyer_dashboard(
+    request: Request,
+    event_id: Optional[int] = None,
+    success: Optional[str] = None,
+    error: Optional[str] = None,
+    db: Session = Depends(get_db)
+):
+    tenant = resolve_tenant(request, db)
+    if not tenant:
+        return templates.TemplateResponse(request, "not_found_tenant.html", context={})
+
+    current_user = get_current_user(request, db)
+    if not current_user:
+        return RedirectResponse(url="/login", status_code=status.HTTP_303_SEE_OTHER)
+
+    # Alle Events des Mandanten
+    all_events = db.query(Event).filter(Event.tenant_id == tenant.id).order_by(Event.event_date.desc(), Event.id.desc()).all()
+
+    # Ausgewähltes Event bestimmen:
+    # 1. Prio: explizit übergebenes event_id
+    # 2. Prio: Event, bei dem current_user als buyer zugewiesen ist und status == 'open'
+    # 3. Prio: erstes offenes Event
+    # 4. Prio: neuestes Event
+    selected_event = None
+    if event_id:
+        selected_event = db.query(Event).filter(Event.id == event_id, Event.tenant_id == tenant.id).first()
+
+    if not selected_event:
+        for ev in all_events:
+            if ev.buyer_id == current_user.id and ev.status == "open":
+                selected_event = ev
+                break
+        if not selected_event:
+            for ev in all_events:
+                if ev.status == "open":
+                    selected_event = ev
+                    break
+        if not selected_event and all_events:
+            selected_event = all_events[0]
+
+    orders = []
+    item_sums = {}
+    total_revenue = Decimal("0.00")
+    total_paid = Decimal("0.00")
+
+    if selected_event:
+        orders = db.query(Order).filter(Order.event_id == selected_event.id).order_by(Order.created_at.asc()).all()
+        for ord_obj in orders:
+            total_revenue += ord_obj.total_price
+            if ord_obj.is_paid:
+                total_paid += ord_obj.total_price
+
+            for it in ord_obj.items:
+                pname = it.product.name if it.product else "Artikel"
+                unit = it.product.unit if it.product else "Stk"
+                if pname not in item_sums:
+                    item_sums[pname] = {"quantity": 0, "unit": unit}
+                item_sums[pname]["quantity"] += it.quantity
+
+    return templates.TemplateResponse(request, "buyer.html", context={
+        "tenant": tenant,
+        "current_user": current_user,
+        "event": selected_event,
+        "all_events": all_events,
+        "orders": orders,
+        "item_sums": item_sums,
+        "total_revenue": total_revenue,
+        "total_paid": total_paid,
+        "success": success,
+        "error": error,
+    })
+
+
 # --- ADMIN COCKPIT (/admin) ---
 
 @app.get("/admin", response_class=HTMLResponse)
@@ -801,6 +877,7 @@ def admin_create_event(
     deadline_date: str = Form(...),
     deadline_time: str = Form(...),
     sponsor_name: Optional[str] = Form(None),
+    buyer_id: Optional[str] = Form(None),
     allow_guests: bool = Form(True),
     force: bool = Form(False),
     db: Session = Depends(get_db)
@@ -827,6 +904,13 @@ def admin_create_event(
                 status_code=status.HTTP_303_SEE_OTHER
             )
 
+    buyer_id_int: Optional[int] = None
+    if buyer_id and buyer_id.strip():
+        try:
+            buyer_id_int = int(buyer_id.strip())
+        except ValueError:
+            pass
+
     new_event = Event(
         tenant_id=tenant.id,
         title=title.strip(),
@@ -834,6 +918,7 @@ def admin_create_event(
         deadline=deadline_dt,
         status="open",
         sponsor_name=sponsor_name.strip() if sponsor_name and sponsor_name.strip() else None,
+        buyer_id=buyer_id_int,
         allow_guests=allow_guests,
         guest_token=secrets.token_urlsafe(16)
     )
@@ -854,6 +939,7 @@ def admin_edit_event(
     deadline_time: str = Form(...),
     status_val: str = Form(...),
     sponsor_name: Optional[str] = Form(None),
+    buyer_id: Optional[str] = Form(None),
     allow_guests: bool = Form(False),
     db: Session = Depends(get_db)
 ):
@@ -871,11 +957,19 @@ def admin_edit_event(
     except ValueError as e:
         raise HTTPException(status_code=400, detail=f"Ungültiges Datumsformat: {e}")
 
+    buyer_id_int: Optional[int] = None
+    if buyer_id and buyer_id.strip():
+        try:
+            buyer_id_int = int(buyer_id.strip())
+        except ValueError:
+            pass
+
     event.title = title.strip()
     event.event_date = ev_date
     event.deadline = deadline_dt
     event.status = status_val
     event.sponsor_name = sponsor_name.strip() if sponsor_name and sponsor_name.strip() else None
+    event.buyer_id = buyer_id_int
     event.allow_guests = allow_guests
     if not event.guest_token:
         event.guest_token = secrets.token_urlsafe(16)
@@ -1179,7 +1273,12 @@ def toggle_paid(order_id: int, request: Request, db: Session = Depends(get_db)):
     if order:
         order.is_paid = not order.is_paid
         db.commit()
-    return RedirectResponse(url=f"/admin?event_id={order.event_id}", status_code=status.HTTP_303_SEE_OTHER)
+
+    ev_id = order.event_id if order else ""
+    referer = request.headers.get("referer", "")
+    if "/einkauf" in referer:
+        return RedirectResponse(url=f"/einkauf?event_id={ev_id}", status_code=status.HTTP_303_SEE_OTHER)
+    return RedirectResponse(url=f"/admin?event_id={ev_id}&tab=orders", status_code=status.HTTP_303_SEE_OTHER)
 
 
 @app.get("/health")
diff --git a/app/models.py b/app/models.py
index 471e364..277f3b9 100644
--- a/app/models.py
+++ b/app/models.py
@@ -82,9 +82,11 @@ class Event(Base):
     allow_guests = Column(Boolean, default=True, nullable=False)
     sponsor_name = Column(String(150), nullable=True)
     guest_token = Column(String(64), nullable=True)
+    buyer_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
     created_at = Column(DateTime, default=func.now())
 
     tenant = relationship("Tenant", back_populates="events")
+    buyer = relationship("User", foreign_keys=[buyer_id])
     orders = relationship("Order", back_populates="event", cascade="all, delete-orphan")
 
 
diff --git a/app/static/style.css b/app/static/style.css
index c73eef7..586d473 100644
--- a/app/static/style.css
+++ b/app/static/style.css
@@ -1,19 +1,52 @@
-:root {
-  --bg-primary: #0b0f19;
-  --bg-secondary: #131b2e;
-  --bg-card: rgba(26, 38, 64, 0.7);
-  --border-color: rgba(255, 255, 255, 0.08);
+:root, [data-theme="light"] {
+  --bg-primary: #f0f5fa;
+  --bg-secondary: #e2edf8;
+  --bg-card: #ffffff;
+  --bg-card-subtle: #f8fafc;
+  --bg-navbar: rgba(255, 255, 255, 0.94);
+  --bg-navbar-mobile: rgba(255, 255, 255, 0.98);
+  --bg-input: #ffffff;
+  --border-color: #cbdbee;
+  --border-subtle: #e2e8f0;
+  --text-main: #0f172a;
+  --text-muted: #475569;
+  --accent: #0066b2; /* Bavarian Diamond Blue / Rautenblau */
+  --accent-hover: #004d88;
+  --accent-gold: #b45309; /* Pretzel Crust Gold */
+  --accent-gold-bg: rgba(180, 83, 9, 0.1);
+  --accent-light: rgba(0, 102, 178, 0.08);
+  --success: #16a34a;
+  --warning: #d97706;
+  --danger: #dc2626;
+  --radius-lg: 16px;
+  --radius-md: 10px;
+  --shadow-card: 0 4px 20px -2px rgba(0, 60, 130, 0.07), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
+  --shadow-md: 0 10px 25px -5px rgba(0, 60, 130, 0.1);
+  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+}
+
+[data-theme="dark"] {
+  --bg-primary: #070e1b;
+  --bg-secondary: #0e172a;
+  --bg-card: rgba(18, 28, 51, 0.88);
+  --bg-card-subtle: rgba(26, 40, 71, 0.7);
+  --bg-navbar: rgba(7, 14, 27, 0.94);
+  --bg-navbar-mobile: rgba(7, 14, 27, 0.98);
+  --bg-input: rgba(11, 20, 38, 0.85);
+  --border-color: rgba(70, 120, 190, 0.22);
+  --border-subtle: rgba(255, 255, 255, 0.08);
   --text-main: #f8fafc;
   --text-muted: #94a3b8;
   --accent: #38bdf8;
   --accent-hover: #0ea5e9;
   --accent-gold: #fbbf24;
+  --accent-gold-bg: rgba(251, 191, 36, 0.15);
+  --accent-light: rgba(56, 189, 248, 0.12);
   --success: #22c55e;
   --warning: #f59e0b;
   --danger: #ef4444;
-  --radius-lg: 16px;
-  --radius-md: 10px;
-  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
+  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
+  --shadow-md: 0 12px 35px rgba(0, 0, 0, 0.5);
 }
 
 * {
@@ -38,6 +71,7 @@ body {
   overflow-x: hidden;
   width: 100%;
   position: relative;
+  transition: background-color 0.2s ease, color 0.2s ease;
 }
 
 .container {
@@ -53,13 +87,15 @@ body {
 
 /* Navbar */
 .navbar {
-  background: rgba(11, 15, 25, 0.9);
+  background: var(--bg-navbar);
   backdrop-filter: blur(16px);
+  -webkit-backdrop-filter: blur(16px);
   border-bottom: 1px solid var(--border-color);
   position: sticky;
   top: 0;
   z-index: 50;
   width: 100%;
+  transition: background 0.2s ease, border-color 0.2s ease;
 }
 
 .nav-content {
@@ -69,6 +105,46 @@ body {
   height: 64px;
 }
 
+.nav-right-cluster {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+@media (min-width: 769px) {
+  .nav-right-cluster {
+    order: 3;
+    margin-left: 14px;
+  }
+  .nav-links {
+    order: 2;
+    margin-left: auto;
+  }
+}
+
+/* Theme Toggle Button */
+.theme-toggle-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  background: var(--bg-card);
+  border: 1px solid var(--border-color);
+  border-radius: 9999px;
+  padding: 6px 13px;
+  color: var(--text-main);
+  font-size: 0.82rem;
+  font-weight: 600;
+  cursor: pointer;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
+  transition: all 0.2s ease;
+}
+
+.theme-toggle-btn:hover {
+  border-color: var(--accent);
+  background: var(--accent-light);
+  transform: translateY(-1px);
+}
+
 /* Mobile Toggle Hamburger */
 .mobile-toggle {
   display: none;
@@ -88,7 +164,7 @@ body {
 }
 
 .mobile-toggle:hover, .mobile-toggle:focus-visible {
-  background: rgba(255, 255, 255, 0.08);
+  background: var(--accent-light);
   border-color: var(--accent);
   outline: none;
 }
@@ -129,13 +205,14 @@ body {
 }
 
 .tenant-badge {
-  background: rgba(56, 189, 248, 0.12);
+  background: var(--accent-light);
   color: var(--accent);
   padding: 2px 8px;
   border-radius: 6px;
   font-size: 0.75rem;
-  font-weight: 600;
-  border: 1px solid rgba(56, 189, 248, 0.2);
+  font-weight: 700;
+  border: 1px solid var(--border-color);
+  text-transform: uppercase;
 }
 
 .nav-links {
@@ -148,44 +225,53 @@ body {
   color: var(--text-muted);
   text-decoration: none;
   font-size: 0.9rem;
-  font-weight: 500;
+  font-weight: 600;
   transition: color 0.2s;
 }
 
 .nav-links a:hover {
-  color: var(--text-main);
+  color: var(--accent);
 }
 
 .user-greeting {
   color: var(--text-main);
   font-size: 0.85rem;
   font-weight: 600;
-  background: rgba(255, 255, 255, 0.05);
+  background: var(--accent-light);
+  border: 1px solid var(--border-color);
   padding: 4px 10px;
   border-radius: 6px;
 }
 
 .nav-logout {
-  color: #ef4444 !important;
+  color: var(--danger) !important;
   font-size: 0.85rem !important;
 }
 
 .nav-links a.nav-admin {
-  background: rgba(251, 191, 36, 0.12);
+  background: var(--accent-gold-bg);
   color: var(--accent-gold);
   padding: 6px 12px;
   border-radius: 6px;
-  font-weight: 600;
-  border: 1px solid rgba(251, 191, 36, 0.25);
+  font-weight: 700;
+  border: 1px solid rgba(180, 83, 9, 0.25);
+}
+
+.nav-links a.nav-einkauf-link {
+  background: var(--accent-light);
+  color: var(--accent);
+  padding: 6px 12px;
+  border-radius: 6px;
+  font-weight: 700;
+  border: 1px solid var(--border-color);
 }
 
 .nav-links a.nav-login {
-  background: rgba(56, 189, 248, 0.12);
-  color: var(--accent);
+  background: var(--accent);
+  color: #ffffff !important;
   padding: 6px 14px;
   border-radius: 6px;
-  font-weight: 600;
-  border: 1px solid rgba(56, 189, 248, 0.25);
+  font-weight: 700;
 }
 
 .main-content {
@@ -415,7 +501,7 @@ body {
   display: flex;
   align-items: center;
   gap: 8px;
-  background: rgba(11, 15, 25, 0.8);
+  background: var(--bg-card-subtle);
   border: 1px solid var(--border-color);
   border-radius: var(--radius-md);
   padding: 4px;
@@ -424,7 +510,7 @@ body {
 .qty-btn {
   width: 34px;
   height: 34px;
-  background: rgba(255, 255, 255, 0.05);
+  background: var(--bg-card);
   border: 1px solid var(--border-color);
   color: var(--text-main);
   border-radius: 6px;
@@ -438,7 +524,7 @@ body {
 
 .qty-btn:hover:not(:disabled) {
   background: var(--accent);
-  color: #0b0f19;
+  color: #ffffff;
 }
 
 .qty-btn:disabled {
@@ -469,6 +555,7 @@ body {
   background: var(--bg-card);
   border: 1px solid var(--border-color);
   border-radius: var(--radius-lg);
+  box-shadow: var(--shadow-card);
   padding: 24px;
   position: sticky;
   top: 90px;
@@ -478,8 +565,8 @@ body {
   display: flex;
   align-items: center;
   gap: 12px;
-  background: rgba(11, 15, 25, 0.6);
-  border: 1px solid rgba(56, 189, 248, 0.25);
+  background: var(--accent-light);
+  border: 1px solid var(--border-color);
   border-radius: var(--radius-md);
   padding: 12px 14px;
   color: var(--text-main);
@@ -488,8 +575,8 @@ body {
 }
 
 .guest-order-box {
-  background: rgba(11, 15, 25, 0.6);
-  border: 1px solid rgba(251, 191, 36, 0.3);
+  background: var(--accent-gold-bg);
+  border: 1px solid rgba(180, 83, 9, 0.25);
   border-radius: var(--radius-md);
   padding: 16px;
   margin-bottom: 18px;
@@ -507,17 +594,19 @@ body {
   color: var(--text-muted);
 }
 
-.input-group input, .input-group select {
+.input-group input, .input-group select, .input-group textarea {
   width: 100%;
   padding: 10px 14px;
-  background: rgba(11, 15, 25, 0.8);
+  background: var(--bg-input);
   border: 1px solid var(--border-color);
   border-radius: var(--radius-md);
   color: var(--text-main);
   font-size: 0.95rem;
+  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
+  transition: border-color 0.15s ease;
 }
 
-.input-group input:focus, .input-group select:focus {
+.input-group input:focus, .input-group select:focus, .input-group textarea:focus {
   outline: none;
   border-color: var(--accent);
 }
@@ -555,7 +644,7 @@ body {
 }
 
 .readonly-input {
-  background: rgba(255, 255, 255, 0.05) !important;
+  background: var(--bg-card-subtle) !important;
   color: var(--text-muted) !important;
   cursor: not-allowed;
 }
@@ -1231,6 +1320,8 @@ body {
 .empty-icon {
   font-size: 3rem;
   margin-bottom: 16px;
+}
+
 /* Demo Toggle & Credentials Box */
 .demo-toggle-wrapper {
   margin: 16px 0 12px;
@@ -1544,6 +1635,199 @@ body {
   }
 }
 
+.hide-mobile {
+  display: inline;
+}
+
+@media (max-width: 768px) {
+  .hide-mobile {
+    display: none !important;
+  }
+}
+
+/* ================= EINKÄUFER- & KASSEN-ZENTRALE (/einkauf) ================= */
+.buyer-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  margin-bottom: 24px;
+  gap: 16px;
+  flex-wrap: wrap;
+}
+
+.buyer-actions {
+  display: flex;
+  gap: 10px;
+  flex-wrap: wrap;
+}
+
+.btn-whatsapp {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  background: #25d366;
+  color: #ffffff;
+  font-weight: 700;
+  padding: 10px 16px;
+  border-radius: var(--radius-md);
+  border: none;
+  cursor: pointer;
+  font-size: 0.9rem;
+  transition: background 0.15s ease, transform 0.1s ease;
+}
+
+.btn-whatsapp:hover {
+  background: #1eb857;
+  transform: translateY(-1px);
+}
+
+.btn-print {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  background: var(--accent);
+  color: #ffffff;
+  font-weight: 700;
+  padding: 10px 16px;
+  border-radius: var(--radius-md);
+  border: none;
+  cursor: pointer;
+  font-size: 0.9rem;
+  transition: background 0.15s ease, transform 0.1s ease;
+}
+
+.btn-print:hover {
+  background: var(--accent-hover);
+  transform: translateY(-1px);
+}
+
+.buyer-grid {
+  display: grid;
+  grid-template-columns: 1fr 1.3fr;
+  gap: 24px;
+  margin-top: 20px;
+}
+
+@media (max-width: 900px) {
+  .buyer-grid {
+    grid-template-columns: 1fr;
+  }
+}
+
+.event-chips-scroll {
+  display: flex;
+  gap: 10px;
+  overflow-x: auto;
+  padding: 4px 2px 10px;
+  margin-bottom: 20px;
+}
+
+.event-chip {
+  display: inline-flex;
+  flex-direction: column;
+  background: var(--bg-card);
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-md);
+  padding: 8px 14px;
+  text-decoration: none;
+  color: var(--text-main);
+  white-space: nowrap;
+  transition: all 0.2s ease;
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
+}
+
+.event-chip:hover {
+  border-color: var(--accent);
+  transform: translateY(-1px);
+}
+
+.event-chip.active {
+  border-color: var(--accent);
+  background: var(--accent-light);
+  border-width: 2px;
+}
+
+.event-chip.completed {
+  opacity: 0.65;
+}
+
+.chip-date {
+  font-size: 0.75rem;
+  font-weight: 700;
+  color: var(--accent);
+}
+
+.chip-title {
+  font-size: 0.88rem;
+  font-weight: 600;
+}
+
+.buyer-whatsapp-box {
+  background: var(--bg-card);
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-lg);
+  padding: 20px;
+  margin-bottom: 24px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 16px;
+  flex-wrap: wrap;
+  box-shadow: var(--shadow-card);
+}
+
+.empty-cell {
+  text-align: center;
+  color: var(--text-muted);
+  padding: 20px !important;
+}
+
+/* Bavarian Light Theme Overrides */
+[data-theme="light"] .banner {
+  background: linear-gradient(135deg, #005ea6 0%, #00447c 100%);
+  color: #ffffff;
+  border-color: #00447c;
+}
+
+[data-theme="light"] .banner h1,
+[data-theme="light"] .banner p,
+[data-theme="light"] .banner .banner-sub,
+[data-theme="light"] .banner .banner-date {
+  color: #ffffff;
+}
+
+[data-theme="light"] .banner .banner-sponsor {
+  background: rgba(255, 255, 255, 0.22);
+  color: #fef08a;
+  border: 1px solid rgba(255, 255, 255, 0.35);
+}
+
+[data-theme="light"] .banner-badge {
+  background: rgba(255, 255, 255, 0.2);
+  color: #ffffff;
+  border-color: rgba(255, 255, 255, 0.4);
+}
+
+[data-theme="light"] .demo-cred-item {
+  background: #f8fafc;
+  border-color: #cbd5e1;
+}
+
+[data-theme="light"] .demo-credentials-card {
+  background: #eef6fc;
+  border-color: #b9d7f2;
+}
+
+[data-theme="light"] .events-ribbon {
+  background: #ffffff;
+  border-color: var(--border-color);
+  box-shadow: var(--shadow-card);
+}
+
+[data-theme="light"] .data-table tbody tr:hover {
+  background: rgba(0, 102, 178, 0.04);
+}
+
 /* ================= PRINT MEDIA QUERY (1-PAGE A4) ================= */
 .print-only {
   display: none;
diff --git a/app/templates/admin.html b/app/templates/admin.html
index 65cfe75..d1e9d1f 100644
--- a/app/templates/admin.html
+++ b/app/templates/admin.html
@@ -87,15 +87,17 @@
   <div class="no-print">
     <div class="admin-header">
       <div>
-        <h1>👨‍🍳 Einkäufer- & Admin-Cockpit</h1>
+        <h1>⚙️ Verwaltung & Orga-Cockpit</h1>
         <p class="admin-sub">Portal: <strong>{{ tenant.name }}</strong></p>
       </div>
       <div class="admin-actions-top">
+        <a href="/einkauf{% if event %}?event_id={{ event.id }}{% endif %}" class="btn-primary" style="text-decoration: none; display: inline-flex; align-items: center; gap: 6px;">
+          🛒 Zur Einkaufs- & Kassenansicht
+        </a>
         {% if event %}
-        <button onclick="copyShoppingList()" class="btn-primary">📋 Einkaufsliste kopieren</button>
         <button onclick="copyGuestPassLink('{{ event.id }}', '{{ event.guest_token or '' }}')" class="btn-secondary" title="Gast-Link für Dienstleister">🔗 Dienstleister-Gastlink</button>
-        <a href="/events/{{ event.id }}/calendar.ics" class="btn-secondary" title="Termin als Outlook/Kalenderdatei (.ics) herunterladen" style="text-decoration: none; display: inline-flex; align-items: center;">📅 Outlook (.ics)</a>
         <button onclick="openOutlookModal()" class="btn-secondary" title="Outlook Einladungsvorlage anzeigen">✉️ Outlook-Vorlage</button>
+        <a href="/events/{{ event.id }}/calendar.ics" class="btn-secondary" title="Termin als Outlook/Kalenderdatei (.ics) herunterladen" style="text-decoration: none; display: inline-flex; align-items: center;">📅 Outlook (.ics)</a>
         <button onclick="window.print()" class="btn-secondary">🖨️ Liste drucken (A4)</button>
         {% endif %}
       </div>
@@ -380,6 +382,18 @@
                 <strong>Gäste- & Dienstleister-Bestellungen erlauben</strong>
               </label>
             </div>
+            <div class="input-group" style="margin-top: 14px;">
+              <label for="edit_buyer">🛒 Zugewiesener Einkäufer für diese Runde</label>
+              <select id="edit_buyer" name="buyer_id">
+                <option value="">-- Nicht zugewiesen / Admin übernimmt --</option>
+                {% for member in team_members %}
+                <option value="{{ member.id }}" {% if event.buyer_id == member.id %}selected{% endif %}>
+                  {{ member.first_name }} {{ member.last_name }} ({{ member.email }})
+                </option>
+                {% endfor %}
+              </select>
+              <small class="field-hint">Der ausgewählte Kollege sieht diese Runde direkt in der Einkaufs-Zentrale.</small>
+            </div>
             <div class="input-group" style="margin-top: 14px;">
               <label for="edit_status">Status der Runde</label>
               <select id="edit_status" name="status_val">
@@ -428,6 +442,17 @@
                 <strong>Gäste- & Dienstleister-Bestellungen erlauben</strong>
               </label>
             </div>
+            <div class="input-group" style="margin-top: 14px;">
+              <label for="new_buyer">🛒 Zugewiesener Einkäufer für diese Runde (Optional)</label>
+              <select id="new_buyer" name="buyer_id">
+                <option value="">-- Nicht zugewiesen / Admin übernimmt --</option>
+                {% for member in team_members %}
+                <option value="{{ member.id }}">
+                  {{ member.first_name }} {{ member.last_name }} ({{ member.email }})
+                </option>
+                {% endfor %}
+              </select>
+            </div>
             <button type="submit" class="btn-primary" style="margin-top: 1rem;">Runde jetzt starten</button>
           </form>
         </div>
diff --git a/app/templates/base.html b/app/templates/base.html
index a361182..40ccb47 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -1,11 +1,18 @@
 <!DOCTYPE html>
-<html lang="de">
+<html lang="de" data-theme="light">
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>{% block title %}Schmankerl – Das moderne Brotzeit-Portal{% endblock %}</title>
   <link rel="stylesheet" href="/static/style.css">
   <link rel="icon" href="https://new.dev.waiswuaschd.de/favicon.ico">
+  <script>
+    (function() {
+      const savedTheme = localStorage.getItem('schmankerl_theme');
+      const theme = savedTheme ? savedTheme : 'light';
+      document.documentElement.setAttribute('data-theme', theme);
+    })();
+  </script>
 </head>
 <body>
 
@@ -14,23 +21,34 @@
       <a href="/" class="brand">
         🥨 <span>Schmankerl</span> <small class="tenant-badge">{{ tenant.name if tenant else 'Portal' }}</small>
       </a>
-      <button class="mobile-toggle" aria-label="Menü öffnen" id="mobileNavToggle" aria-expanded="false">
-        <span class="bar"></span>
-        <span class="bar"></span>
-        <span class="bar"></span>
-      </button>
+
+      <div class="nav-right-cluster">
+        <!-- Theme Switcher -->
+        <button type="button" class="theme-toggle-btn" id="themeToggleBtn" onclick="toggleTheme()" title="Design umschalten (Hell / Dunkel)">
+          <span id="themeToggleIcon">🌙</span> <span id="themeToggleLabel" class="hide-mobile">Dunkel</span>
+        </button>
+
+        <!-- Mobile Hamburger Toggle -->
+        <button class="mobile-toggle" aria-label="Menü öffnen" id="mobileNavToggle" aria-expanded="false">
+          <span class="bar"></span>
+          <span class="bar"></span>
+          <span class="bar"></span>
+        </button>
+      </div>
+
       <nav class="nav-links" id="navLinks">
         {% if current_user %}
-        <a href="/">🥨 Brotzeit bestellen</a>
+        <a href="/" class="nav-item">🥨 Bestellen</a>
+        <a href="/einkauf" class="nav-item nav-einkauf-link">🛒 Einkaufsliste & Kasse</a>
         {% if current_user.role == 'admin' %}
-        <a href="/admin" class="nav-admin">👨‍🍳 Einkäufer-Cockpit</a>
+        <a href="/admin" class="nav-item nav-admin">⚙️ Orga & Admin</a>
         {% endif %}
         <span class="user-greeting">👤 {{ current_user.first_name }}</span>
-        <a href="/logout" class="nav-logout">Abmelden</a>
+        <a href="/logout" class="nav-item nav-logout">Abmelden</a>
         {% else %}
-        <a href="/login" class="nav-login">Anmelden</a>
+        <a href="/login" class="nav-item nav-login">Anmelden</a>
         {% endif %}
-        <a href="https://new.dev.waiswuaschd.de" target="_blank" class="nav-home">Zur Plattform</a>
+        <a href="https://new.dev.waiswuaschd.de" target="_blank" class="nav-item nav-home">Zur Plattform</a>
       </nav>
     </div>
   </header>
@@ -49,24 +67,52 @@
   </footer>
 
   <script>
-    const navToggle = document.getElementById('mobileNavToggle');
-    const navLinks = document.getElementById('navLinks');
-    if (navToggle && navLinks) {
-      navToggle.addEventListener('click', () => {
-        const isOpen = navLinks.classList.toggle('open');
-        navToggle.classList.toggle('open', isOpen);
-        navToggle.setAttribute('aria-expanded', isOpen);
-        document.body.style.overflow = isOpen ? 'hidden' : '';
-      });
-      navLinks.querySelectorAll('a').forEach(link => {
-        link.addEventListener('click', () => {
-          navLinks.classList.remove('open');
-          navToggle.classList.remove('open');
-          navToggle.setAttribute('aria-expanded', 'false');
-          document.body.style.overflow = '';
-        });
-      });
+    // Theme Toggle Logic
+    function updateThemeUI(theme) {
+      const icon = document.getElementById('themeToggleIcon');
+      const label = document.getElementById('themeToggleLabel');
+      if (theme === 'dark') {
+        if (icon) icon.innerText = '☀️';
+        if (label) label.innerText = 'Hell';
+      } else {
+        if (icon) icon.innerText = '🌙';
+        if (label) label.innerText = 'Dunkel';
+      }
     }
+
+    function toggleTheme() {
+      const current = document.documentElement.getAttribute('data-theme') || 'light';
+      const next = current === 'dark' ? 'light' : 'dark';
+      document.documentElement.setAttribute('data-theme', next);
+      localStorage.setItem('schmankerl_theme', next);
+      updateThemeUI(next);
+    }
+
+    // Initialize Theme UI on load
+    document.addEventListener('DOMContentLoaded', () => {
+      const current = document.documentElement.getAttribute('data-theme') || 'light';
+      updateThemeUI(current);
+
+      // Mobile Nav Drawer Toggle
+      const navToggle = document.getElementById('mobileNavToggle');
+      const navLinks = document.getElementById('navLinks');
+      if (navToggle && navLinks) {
+        navToggle.addEventListener('click', () => {
+          const isOpen = navLinks.classList.toggle('open');
+          navToggle.classList.toggle('open', isOpen);
+          navToggle.setAttribute('aria-expanded', isOpen);
+          document.body.style.overflow = isOpen ? 'hidden' : '';
+        });
+        navLinks.querySelectorAll('a').forEach(link => {
+          link.addEventListener('click', () => {
+            navLinks.classList.remove('open');
+            navToggle.classList.remove('open');
+            navToggle.setAttribute('aria-expanded', 'false');
+            document.body.style.overflow = '';
+          });
+        });
+      }
+    });
   </script>
 </body>
 </html>
diff --git a/app/templates/buyer.html b/app/templates/buyer.html
new file mode 100644
index 0000000..9b2b69d
--- /dev/null
+++ b/app/templates/buyer.html
@@ -0,0 +1,302 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="container">
+
+  <!-- ================= COMPACT PRINT VIEW (1-PAGE A4) ================= -->
+  <div class="print-only">
+    <!-- Single-line condensed header -->
+    <div class="print-header-singleline">
+      <div class="print-left">
+        <span class="print-logo">🥨 Schmankerl</span>
+        <strong>{{ event.title if event else 'Brotzeitrunde' }}</strong> 
+        <span class="print-date">({{ event.event_date.strftime('%d.%m.%Y') if event else '' }})</span>
+      </div>
+      <div class="print-right">
+        <span>Teilnehmer: <strong>{{ orders|length }}</strong></span>
+        <span> | </span>
+        <span>Einkauf: <strong>{{ "%.2f"|format(total_revenue) }} €</strong></span>
+        {% if event and event.sponsor_name %}
+        <span> | </span>
+        <span class="print-sponsor">🎉 Sponsor: <strong>{{ event.sponsor_name }}</strong></span>
+        {% endif %}
+      </div>
+    </div>
+
+    <!-- Compact Sammelliste -->
+    <div class="print-sammel-box">
+      <span class="print-sammel-title">🛒 Einkauf (Bäcker & Metzger):</span>
+      {% for name, data in item_sums.items() %}
+      <span class="print-item-pill">
+        <strong>{{ data.quantity }}x</strong> {{ name }}
+      </span>
+      {% else %}
+      <span>Keine Artikel</span>
+      {% endfor %}
+    </div>
+
+    <!-- Ausgabeliste zum Abhaken -->
+    <table class="print-table">
+      <thead>
+        <tr>
+          <th style="width: 28px; text-align: center;">☐</th>
+          <th style="width: 25%;">Kollege / Name</th>
+          <th>Bestellte Artikel</th>
+          <th style="width: 70px; text-align: right;">Betrag</th>
+          <th style="width: 85px; text-align: center;">Kasse</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for order in orders %}
+        <tr>
+          <td style="text-align: center; font-size: 10pt;">☐</td>
+          <td>
+            <strong>{{ order.display_name }}</strong>
+            {% if order.user and order.user.role == 'guest' %}<small class="guest-tag">(Gast)</small>{% endif %}
+          </td>
+          <td class="print-items-cell">
+            {% for item in order.items %}
+            <span>{{ item.quantity }}x {{ item.product.name }}</span>{% if not loop.last %}, {% endif %}
+            {% endfor %}
+          </td>
+          <td style="text-align: right; font-weight: bold;">
+            {% if event and event.sponsor_name %}
+            <span style="font-size: 8pt; color: #555;">Sponsor</span>
+            {% else %}
+            {{ "%.2f"|format(order.total_price) }} €
+            {% endif %}
+          </td>
+          <td style="text-align: center; font-size: 8pt;">
+            {% if event and event.sponsor_name %}
+            Übernommen
+            {% elif order.is_paid %}
+            Bezahlt ✓
+            {% else %}
+            Offen
+            {% endif %}
+          </td>
+        </tr>
+        {% else %}
+        <tr><td colspan="5" style="text-align: center;">Keine Bestellungen vorhanden.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </div>
+
+  <!-- ================= NORMAL SCREEN VIEW ================= -->
+  <div class="no-print">
+    
+    <!-- Einkäufer Header -->
+    <div class="buyer-header">
+      <div>
+        <span class="badge-role" style="margin-bottom: 6px;">🛒 Einkäufer- & Kassen-Zentrale</span>
+        <h1>{{ event.title if event else 'Brotzeitrunde' }}</h1>
+        <p class="admin-sub">
+          Termin: <strong>{{ event.event_date.strftime('%d.%m.%Y') if event else '' }}</strong> | 
+          Bestellschluss: <strong>{{ event.deadline.strftime('%d.%m. um %H:%M Uhr') if event else '' }}</strong>
+          {% if event and event.buyer %}
+          | 🏃 Einkäufer: <strong>{{ event.buyer.first_name }} {{ event.buyer.last_name }}</strong>
+          {% endif %}
+        </p>
+      </div>
+
+      <div class="buyer-actions">
+        {% if event %}
+        <button onclick="copyShoppingList()" class="btn-primary">📋 Einkaufsliste kopieren</button>
+        <button onclick="window.print()" class="btn-secondary">🖨️ Liste drucken (A4)</button>
+        <a href="/events/{{ event.id }}/calendar.ics" class="btn-secondary" style="text-decoration: none; display: inline-flex; align-items: center;">📅 Outlook (.ics)</a>
+        {% endif %}
+        {% if current_user.role == 'admin' %}
+        <a href="/admin" class="btn-outline" style="text-decoration: none;">⚙️ Zur Verwaltung</a>
+        {% endif %}
+      </div>
+    </div>
+
+    {% if success %}
+    <div class="alert-success" style="margin-bottom: 20px;">
+      ✓ {{ success }}
+    </div>
+    {% endif %}
+
+    <!-- EVENT-LEISTE (Falls mehrere Runden existieren) -->
+    {% if all_events|length > 1 %}
+    <div class="events-ribbon">
+      <div class="events-ribbon-title">
+        <span>📅 Runde wählen:</span>
+      </div>
+      <div class="events-ribbon-list">
+        {% for ev in all_events %}
+        <a href="/einkauf?event_id={{ ev.id }}" class="event-chip {% if event and event.id == ev.id %}active{% endif %} {% if ev.status == 'completed' %}completed{% endif %}">
+          <span class="chip-date">{{ ev.event_date.strftime('%d.%m.') }}</span>
+          <span class="chip-title">{{ ev.title }}</span>
+          {% if ev.status == 'open' %}
+          <span class="chip-badge open">🟢 Offen</span>
+          {% elif ev.status == 'completed' %}
+          <span class="chip-badge comp">🏁 Abgeschlossen</span>
+          {% else %}
+          <span class="chip-badge closed">🔴 Geschlossen</span>
+          {% endif %}
+        </a>
+        {% endfor %}
+      </div>
+    </div>
+    {% endif %}
+
+    {% if event %}
+
+      {% if event.sponsor_name %}
+      <div class="sponsor-highlight-card">
+        <div class="sponsor-icon">🎁</div>
+        <div>
+          <h3>Diese Runde wird gesponsert!</h3>
+          <p>Sponsor / Anlass: <strong>{{ event.sponsor_name }}</strong> übernimmt die Gesamtrechnung von <strong>{{ "%.2f"|format(total_revenue) }} €</strong> für das gesamte Team.</p>
+        </div>
+      </div>
+      {% endif %}
+
+      <!-- Stats Cards -->
+      <div class="stats-grid">
+        <div class="stat-card">
+          <div class="stat-label">Gesamtsumme Einkauf</div>
+          <div class="stat-value">{{ "%.2f"|format(total_revenue) }} €</div>
+        </div>
+        <div class="stat-card">
+          <div class="stat-label">Bereits bezahlt</div>
+          <div class="stat-value success">
+            {% if event.sponsor_name %}Gesponsert{% else %}{{ "%.2f"|format(total_paid) }} €{% endif %}
+          </div>
+        </div>
+        <div class="stat-card">
+          <div class="stat-label">Noch offen</div>
+          <div class="stat-value warning">
+            {% if event.sponsor_name %}0,00 €{% else %}{{ "%.2f"|format(total_revenue - total_paid) }} €{% endif %}
+          </div>
+        </div>
+        <div class="stat-card">
+          <div class="stat-label">Teilnehmer</div>
+          <div class="stat-value">{{ orders|length }} Personen</div>
+        </div>
+      </div>
+
+      <!-- 2-Column Responsive Layout -->
+      <div class="admin-columns">
+        
+        <!-- Sammelliste für Metzger & Bäcker -->
+        <div class="admin-card">
+          <h2>🛒 Sammelliste für Metzger & Bäcker</h2>
+          <p class="card-hint">Das musst du für die gesamte Runde besorgen:</p>
+          
+          <div class="shopping-table-wrapper">
+            <table class="data-table">
+              <thead>
+                <tr>
+                  <th>Artikel</th>
+                  <th style="text-align: right;">Gesamtmenge</th>
+                </tr>
+              </thead>
+              <tbody>
+                {% for name, data in item_sums.items() %}
+                <tr>
+                  <td><strong>{{ name }}</strong></td>
+                  <td style="text-align: right; font-size: 1.25rem; font-weight: 800; color: var(--accent);">
+                    {{ data.quantity }} {{ data.unit }}
+                  </td>
+                </tr>
+                {% else %}
+                <tr><td colspan="2" class="empty-cell">Noch keine Bestellungen eingegangen.</td></tr>
+                {% endfor %}
+              </tbody>
+            </table>
+          </div>
+        </div>
+
+        <!-- Einzelübersicht / Strichliste zum Abhaken -->
+        <div class="admin-card">
+          <h2>👥 Wer bekommt was? (Kasse & Abhaken)</h2>
+          <p class="card-hint">Tippe auf den Status, um bezahlt/offen umzuschalten:</p>
+
+          <div class="orders-table-wrapper">
+            <table class="data-table">
+              <thead>
+                <tr>
+                  <th>Kollege / Gast</th>
+                  <th>Bestellung</th>
+                  <th>Betrag</th>
+                  <th>Status</th>
+                </tr>
+              </thead>
+              <tbody>
+                {% for order in orders %}
+                <tr>
+                  <td>
+                    <strong>{{ order.display_name }}</strong>
+                    {% if order.user and order.user.role == 'guest' %}
+                    <span class="badge-role guest">Gast</span>
+                    {% elif not order.user and order.guest_display_name %}
+                    <span class="badge-role" style="background: rgba(148, 163, 184, 0.15); color: #cbd5e1;">Gast</span>
+                    {% endif %}
+                  </td>
+                  <td>
+                    <ul class="mini-items-list">
+                      {% for item in order.items %}
+                      <li><strong>{{ item.quantity }}x</strong> {{ item.product.name }}</li>
+                      {% endfor %}
+                    </ul>
+                  </td>
+                  <td>
+                    <strong>{{ "%.2f"|format(order.total_price) }} €</strong>
+                    {% if event.sponsor_name %}<br><small class="text-muted">von Sponsor</small>{% endif %}
+                  </td>
+                  <td>
+                    {% if event.sponsor_name %}
+                    <span class="badge-btn paid" style="cursor: default;">✓ Gesponsert</span>
+                    {% else %}
+                    <form action="/admin/toggle-paid/{{ order.id }}" method="POST" style="margin: 0;">
+                      <button type="submit" class="badge-btn {% if order.is_paid %}paid{% else %}unpaid{% endif %}">
+                        {% if order.is_paid %}✓ Bezahlt{% else %}⏳ Offen{% endif %}
+                      </button>
+                    </form>
+                    {% endif %}
+                  </td>
+                </tr>
+                {% else %}
+                <tr><td colspan="4" class="empty-cell">Noch keine Bestellungen vorhanden.</td></tr>
+                {% endfor %}
+              </tbody>
+            </table>
+          </div>
+        </div>
+
+      </div>
+
+    {% else %}
+    <div class="empty-state">
+      <div class="empty-icon">🏖️</div>
+      <h2>Keine aktive Runde vorhanden</h2>
+      <p>Aktuell ist keine Brotzeit geplant.</p>
+    </div>
+    {% endif %}
+
+  </div>
+</div>
+
+<script>
+  function copyShoppingList() {
+    let text = "🥨 Einkaufsliste für " + {{ (event.title if event else 'Brotzeit') | tojson }} + " (" + {{ (event.event_date.strftime('%d.%m.%Y') if event else '') | tojson }} + "):\n\n";
+    {% for name, data in item_sums.items() %}
+    text += "• " + {{ name | tojson }} + ": " + {{ (data.quantity ~ ' ' ~ data.unit) | tojson }} + "\n";
+    {% endfor %}
+    text += "\nGesamtsumme: {{ '%.2f'|format(total_revenue) }} €";
+
+    if (navigator.clipboard && navigator.clipboard.writeText) {
+      navigator.clipboard.writeText(text).then(() => {
+        alert("Einkaufsliste in die Zwischenablage kopiert! Kann direkt in WhatsApp oder Slack geteilt werden.");
+      }).catch(() => {
+        prompt("Kopiere die Einkaufsliste:", text);
+      });
+    } else {
+      prompt("Kopiere die Einkaufsliste:", text);
+    }
+  }
+</script>
+{% endblock %}