diff --git a/backend/src/controllers/config.controller.ts b/backend/src/controllers/config.controller.ts
index 0700f57..fd62a18 100644
--- a/backend/src/controllers/config.controller.ts
+++ b/backend/src/controllers/config.controller.ts
@@ -15,17 +15,23 @@ class ConfigController {
 
   async getPdfSettings(_req: Request, res: Response): Promise<void> {
     try {
-      const header = await settingsService.get('pdf_header');
-      const footer = await settingsService.get('pdf_footer');
+      const [header, footer, logo, orgName] = await Promise.all([
+        settingsService.get('pdf_header'),
+        settingsService.get('pdf_footer'),
+        settingsService.get('pdf_logo'),
+        settingsService.get('pdf_org_name'),
+      ]);
       res.json({
         success: true,
         data: {
           pdf_header: header?.value ?? '',
           pdf_footer: footer?.value ?? '',
+          pdf_logo: logo?.value ?? '',
+          pdf_org_name: orgName?.value ?? '',
         },
       });
     } catch {
-      res.json({ success: true, data: { pdf_header: '', pdf_footer: '' } });
+      res.json({ success: true, data: { pdf_header: '', pdf_footer: '', pdf_logo: '', pdf_org_name: '' } });
     }
   }
 
diff --git a/backend/src/services/bookstack.service.ts b/backend/src/services/bookstack.service.ts
index 9d29379..170de6f 100644
--- a/backend/src/services/bookstack.service.ts
+++ b/backend/src/services/bookstack.service.ts
@@ -81,6 +81,25 @@ function buildHeaders(): Record<string, string> {
   };
 }
 
+/**
+ * Fetches all BookStack books and returns a map of book_id → book_slug.
+ * The /api/pages list endpoint does not reliably include book_slug, so we
+ * look it up separately and use it when constructing page URLs.
+ */
+async function getBookSlugMap(): Promise<Map<number, string>> {
+  const { bookstack } = environment;
+  try {
+    const response = await axios.get(
+      `${bookstack.url}/api/books`,
+      { params: { count: 500 }, headers: buildHeaders() },
+    );
+    const books: Array<{ id: number; slug: string }> = response.data?.data ?? [];
+    return new Map(books.map((b) => [b.id, b.slug]));
+  } catch {
+    return new Map();
+  }
+}
+
 async function getRecentPages(): Promise<BookStackPage[]> {
   const { bookstack } = environment;
   if (!bookstack.url || !isValidServiceUrl(bookstack.url)) {
@@ -88,17 +107,20 @@ async function getRecentPages(): Promise<BookStackPage[]> {
   }
 
   try {
-    const response = await axios.get(
-      `${bookstack.url}/api/pages`,
-      {
-        params: { sort: '-updated_at', count: 20 },
-        headers: buildHeaders(),
-      },
-    );
+    const [response, bookSlugMap] = await Promise.all([
+      axios.get(
+        `${bookstack.url}/api/pages`,
+        {
+          params: { sort: '-updated_at', count: 20 },
+          headers: buildHeaders(),
+        },
+      ),
+      getBookSlugMap(),
+    ]);
     const pages: BookStackPage[] = response.data?.data ?? [];
     return pages.map((p) => ({
       ...p,
-      url: `${bookstack.url}/books/${p.book_slug || p.book_id}/page/${p.slug}`,
+      url: `${bookstack.url}/books/${bookSlugMap.get(p.book_id) || p.book_slug || p.book_id}/page/${p.slug}`,
     }));
   } catch (error) {
     if (axios.isAxiosError(error)) {
@@ -174,11 +196,15 @@ async function getPageById(id: number): Promise<BookStackPageDetail> {
   }
 
   try {
-    const response = await axios.get(
-      `${bookstack.url}/api/pages/${id}`,
-      { headers: buildHeaders() },
-    );
+    const [response, bookSlugMap] = await Promise.all([
+      axios.get(
+        `${bookstack.url}/api/pages/${id}`,
+        { headers: buildHeaders() },
+      ),
+      getBookSlugMap(),
+    ]);
     const page = response.data;
+    const bookSlug = bookSlugMap.get(page.book_id) || page.book?.slug || page.book_slug || page.book_id;
     return {
       id: page.id,
       name: page.name,
@@ -189,7 +215,7 @@ async function getPageById(id: number): Promise<BookStackPageDetail> {
       html: page.html ?? '',
       created_at: page.created_at,
       updated_at: page.updated_at,
-      url: `${bookstack.url}/books/${page.book?.slug || page.book_slug || page.book_id}/page/${page.slug}`,
+      url: `${bookstack.url}/books/${bookSlug}/page/${page.slug}`,
       book: page.book,
       createdBy: page.created_by,
       updatedBy: page.updated_by,
diff --git a/frontend/src/components/chat/ChatPanel.tsx b/frontend/src/components/chat/ChatPanel.tsx
index 6a6027a..f86d108 100644
--- a/frontend/src/components/chat/ChatPanel.tsx
+++ b/frontend/src/components/chat/ChatPanel.tsx
@@ -17,6 +17,7 @@ import { Link } from 'react-router-dom';
 import { useQuery, useQueryClient } from '@tanstack/react-query';
 import { configApi } from '../../services/config';
 import { notificationsApi } from '../../services/notifications';
+import { nextcloudApi } from '../../services/nextcloud';
 import { safeOpenUrl } from '../../utils/safeOpenUrl';
 import ChatRoomList from './ChatRoomList';
 import ChatMessageView from './ChatMessageView';
@@ -36,12 +37,27 @@ const ChatPanelInner: React.FC = () => {
   });
   const nextcloudUrl = externalLinks?.nextcloud;
 
+  // Keep a ref to rooms so the effect can access the latest list without
+  // re-running every time room data refreshes.
+  const roomsRef = React.useRef(rooms);
+  roomsRef.current = rooms;
+
   React.useEffect(() => {
     if (chatPanelOpen) {
+      // Dismiss our internal notification-centre entries
       notificationsApi.dismissByType('nextcloud_talk').then(() => {
         queryClient.invalidateQueries({ queryKey: ['notifications'] });
         queryClient.invalidateQueries({ queryKey: ['unreadNotificationCount'] });
       }).catch(() => {});
+
+      // Also mark all unread rooms as read directly in Nextcloud so that
+      // Nextcloud's own notification badges clear as well.
+      roomsRef.current
+        .filter((r) => r.unreadMessages > 0)
+        .forEach((r) => {
+          nextcloudApi.markAsRead(r.token).catch(() => {});
+        });
+      queryClient.invalidateQueries({ queryKey: ['nextcloud', 'rooms'] });
     }
   }, [chatPanelOpen, queryClient]);
 
diff --git a/frontend/src/components/shared/Sidebar.tsx b/frontend/src/components/shared/Sidebar.tsx
index a24140b..34ee2eb 100644
--- a/frontend/src/components/shared/Sidebar.tsx
+++ b/frontend/src/components/shared/Sidebar.tsx
@@ -27,14 +27,16 @@ import {
   ExpandLess,
 } from '@mui/icons-material';
 import { useNavigate, useLocation } from 'react-router-dom';
+import { useQuery } from '@tanstack/react-query';
 import { useLayout, DRAWER_WIDTH, DRAWER_WIDTH_COLLAPSED } from '../../contexts/LayoutContext';
 import { useAuth } from '../../contexts/AuthContext';
+import { vehiclesApi } from '../../services/vehicles';
 
 export { DRAWER_WIDTH, DRAWER_WIDTH_COLLAPSED };
 
 interface SubItem {
   text: string;
-  tabIndex: number;
+  path: string;
 }
 
 interface NavigationItem {
@@ -45,17 +47,17 @@ interface NavigationItem {
 }
 
 const kalenderSubItems: SubItem[] = [
-  { text: 'Veranstaltungen', tabIndex: 0 },
-  { text: 'Fahrzeugbuchungen', tabIndex: 1 },
+  { text: 'Veranstaltungen', path: '/kalender?tab=0' },
+  { text: 'Fahrzeugbuchungen', path: '/kalender?tab=1' },
 ];
 
 const adminSubItems: SubItem[] = [
-  { text: 'Services', tabIndex: 0 },
-  { text: 'System', tabIndex: 1 },
-  { text: 'Benutzer', tabIndex: 2 },
-  { text: 'Broadcast', tabIndex: 3 },
-  { text: 'Banner', tabIndex: 4 },
-  { text: 'Wartung', tabIndex: 5 },
+  { text: 'Services', path: '/admin?tab=0' },
+  { text: 'System', path: '/admin?tab=1' },
+  { text: 'Benutzer', path: '/admin?tab=2' },
+  { text: 'Broadcast', path: '/admin?tab=3' },
+  { text: 'Banner', path: '/admin?tab=4' },
+  { text: 'Wartung', path: '/admin?tab=5' },
 ];
 
 const baseNavigationItems: NavigationItem[] = [
@@ -123,9 +125,34 @@ function Sidebar({ mobileOpen, onMobileClose }: SidebarProps) {
 
   const isAdmin = user?.groups?.includes('dashboard_admin') ?? false;
 
-  const navigationItems = useMemo(() => {
-    return isAdmin ? [...baseNavigationItems, adminItem, adminSettingsItem] : baseNavigationItems;
-  }, [isAdmin]);
+  // Fetch vehicle list for dynamic dropdown sub-items
+  const { data: vehicleList } = useQuery({
+    queryKey: ['vehicles', 'sidebar'],
+    queryFn: () => vehiclesApi.getAll(),
+    staleTime: 2 * 60 * 1000,
+  });
+
+  const vehicleSubItems: SubItem[] = useMemo(
+    () =>
+      (vehicleList ?? []).map((v) => ({
+        text: v.kurzname ?? v.bezeichnung,
+        path: `/fahrzeuge/${v.id}`,
+      })),
+    [vehicleList],
+  );
+
+  const navigationItems = useMemo((): NavigationItem[] => {
+    const fahrzeugeItem: NavigationItem = {
+      text: 'Fahrzeuge',
+      icon: <DirectionsCar />,
+      path: '/fahrzeuge',
+      subItems: vehicleSubItems.length > 0 ? vehicleSubItems : undefined,
+    };
+    const items = baseNavigationItems.map((item) =>
+      item.path === '/fahrzeuge' ? fahrzeugeItem : item,
+    );
+    return isAdmin ? [...items, adminItem, adminSettingsItem] : items;
+  }, [isAdmin, vehicleSubItems]);
 
   // Expand state for items with sub-items — auto-expand when route matches
   const [expandedItems, setExpandedItems] = useState<Record<string, boolean>>({});
@@ -169,7 +196,7 @@ function Sidebar({ mobileOpen, onMobileClose }: SidebarProps) {
                 >
                   <ListItemButton
                     selected={isActive}
-                    onClick={() => handleNavigation(hasSubItems ? `${item.path}?tab=0` : item.path)}
+                    onClick={() => handleNavigation(hasSubItems ? item.subItems![0].path : item.path)}
                     aria-label={`Zu ${item.text} navigieren`}
                     sx={{
                       justifyContent: sidebarCollapsed ? 'center' : 'initial',
@@ -219,14 +246,11 @@ function Sidebar({ mobileOpen, onMobileClose }: SidebarProps) {
                 <Collapse in={expanded} timeout="auto" unmountOnExit>
                   <List disablePadding>
                     {item.subItems!.map((sub) => {
-                      const subPath = `${item.path}?tab=${sub.tabIndex}`;
-                      const isSubActive =
-                        location.pathname === item.path &&
-                        location.search === `?tab=${sub.tabIndex}`;
+                      const isSubActive = location.pathname + location.search === sub.path;
                       return (
                         <ListItemButton
-                          key={sub.tabIndex}
-                          onClick={() => handleNavigation(subPath)}
+                          key={sub.path}
+                          onClick={() => handleNavigation(sub.path)}
                           selected={isSubActive}
                           sx={{
                             pl: 4,
diff --git a/frontend/src/pages/AdminSettings.tsx b/frontend/src/pages/AdminSettings.tsx
index a8e38ab..cbf1503 100644
--- a/frontend/src/pages/AdminSettings.tsx
+++ b/frontend/src/pages/AdminSettings.tsx
@@ -1,4 +1,4 @@
-import { useState, useEffect } from 'react';
+import React, { useState, useEffect } from 'react';
 import {
   Container,
   Typography,
@@ -76,9 +76,11 @@ function AdminSettings() {
     adminServices: 15,
   });
 
-  // State for PDF header/footer
+  // State for PDF header/footer/logo/org
   const [pdfHeader, setPdfHeader] = useState('');
   const [pdfFooter, setPdfFooter] = useState('');
+  const [pdfLogo, setPdfLogo] = useState('');
+  const [pdfOrgName, setPdfOrgName] = useState('');
 
   // Fetch all settings
   const { data: settings, isLoading } = useQuery({
@@ -113,6 +115,10 @@ function AdminSettings() {
       if (pdfHeaderSetting?.value != null) setPdfHeader(pdfHeaderSetting.value);
       const pdfFooterSetting = settings.find((s) => s.key === 'pdf_footer');
       if (pdfFooterSetting?.value != null) setPdfFooter(pdfFooterSetting.value);
+      const pdfLogoSetting = settings.find((s) => s.key === 'pdf_logo');
+      if (pdfLogoSetting?.value != null) setPdfLogo(pdfLogoSetting.value);
+      const pdfOrgNameSetting = settings.find((s) => s.key === 'pdf_org_name');
+      if (pdfOrgNameSetting?.value != null) setPdfOrgName(pdfOrgNameSetting.value);
     }
   }, [settings]);
 
@@ -156,17 +162,40 @@ function AdminSettings() {
       queryClient.invalidateQueries({ queryKey: ['pdf-settings'] });
     },
   });
+  const pdfLogoMutation = useMutation({
+    mutationFn: (value: string) => settingsApi.update('pdf_logo', value),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['admin-settings'] });
+      queryClient.invalidateQueries({ queryKey: ['pdf-settings'] });
+    },
+  });
+  const pdfOrgNameMutation = useMutation({
+    mutationFn: (value: string) => settingsApi.update('pdf_org_name', value),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['admin-settings'] });
+      queryClient.invalidateQueries({ queryKey: ['pdf-settings'] });
+    },
+  });
   const handleSavePdfSettings = async () => {
     try {
       await Promise.all([
         pdfHeaderMutation.mutateAsync(pdfHeader),
         pdfFooterMutation.mutateAsync(pdfFooter),
+        pdfLogoMutation.mutateAsync(pdfLogo),
+        pdfOrgNameMutation.mutateAsync(pdfOrgName),
       ]);
       showSuccess('PDF-Einstellungen gespeichert');
     } catch {
       showError('Fehler beim Speichern der PDF-Einstellungen');
     }
   };
+  const handleLogoUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0];
+    if (!file) return;
+    const reader = new FileReader();
+    reader.onload = (ev) => setPdfLogo(ev.target?.result as string);
+    reader.readAsDataURL(file);
+  };
 
   if (!isAdmin) {
     return <Navigate to="/dashboard" replace />;
@@ -423,7 +452,44 @@ function AdminSettings() {
               </Typography>
               <Stack spacing={2}>
                 <TextField
-                  label="PDF Kopfzeile"
+                  label="Organisationsname (rechts im PDF-Header)"
+                  value={pdfOrgName}
+                  onChange={(e) => setPdfOrgName(e.target.value)}
+                  fullWidth
+                  size="small"
+                  placeholder="FREIWILLIGE FEUERWEHR REMS"
+                />
+                <Box>
+                  <Typography variant="body2" color="text.secondary" gutterBottom>
+                    Logo (erscheint rechts im PDF-Header, neben dem Organisationsnamen)
+                  </Typography>
+                  <Box sx={{ display: 'flex', alignItems: 'center', gap: 1.5 }}>
+                    <Button component="label" variant="outlined" size="small">
+                      Logo hochladen
+                      <input
+                        type="file"
+                        hidden
+                        accept="image/*"
+                        onChange={handleLogoUpload}
+                      />
+                    </Button>
+                    {pdfLogo && (
+                      <>
+                        <Box
+                          component="img"
+                          src={pdfLogo}
+                          alt="Logo Vorschau"
+                          sx={{ height: 40, maxWidth: 120, objectFit: 'contain', borderRadius: 1 }}
+                        />
+                        <IconButton size="small" onClick={() => setPdfLogo('')} title="Logo entfernen">
+                          <Delete fontSize="small" />
+                        </IconButton>
+                      </>
+                    )}
+                  </Box>
+                </Box>
+                <TextField
+                  label="PDF Kopfzeile (links, unter dem Header-Banner)"
                   value={pdfHeader}
                   onChange={(e) => setPdfHeader(e.target.value)}
                   multiline
@@ -447,7 +513,12 @@ function AdminSettings() {
                     onClick={handleSavePdfSettings}
                     variant="contained"
                     size="small"
-                    disabled={pdfHeaderMutation.isPending || pdfFooterMutation.isPending}
+                    disabled={
+                      pdfHeaderMutation.isPending ||
+                      pdfFooterMutation.isPending ||
+                      pdfLogoMutation.isPending ||
+                      pdfOrgNameMutation.isPending
+                    }
                   >
                     Speichern
                   </Button>
diff --git a/frontend/src/pages/FahrzeugBuchungen.tsx b/frontend/src/pages/FahrzeugBuchungen.tsx
index fbfbd92..6f8ab0a 100644
--- a/frontend/src/pages/FahrzeugBuchungen.tsx
+++ b/frontend/src/pages/FahrzeugBuchungen.tsx
@@ -398,7 +398,7 @@ function FahrzeugBuchungen() {
           <TableContainer component={Paper} elevation={1}>
             <Table size="small" sx={{ tableLayout: 'fixed' }}>
               <TableHead>
-                <TableRow sx={{ bgcolor: (theme) => theme.palette.mode === 'dark' ? 'grey.800' : 'grey.100' }}>
+                <TableRow sx={{ bgcolor: (theme) => theme.palette.mode === 'dark' ? 'grey.900' : 'grey.100' }}>
                   <TableCell sx={{ width: 160, fontWeight: 700 }}>
                     Fahrzeug
                   </TableCell>
diff --git a/frontend/src/pages/Kalender.tsx b/frontend/src/pages/Kalender.tsx
index 2d140aa..39f2bbe 100644
--- a/frontend/src/pages/Kalender.tsx
+++ b/frontend/src/pages/Kalender.tsx
@@ -675,7 +675,7 @@ async function fetchPdfSettings(): Promise<PdfSettings> {
     _pdfSettingsCacheTime = Date.now();
     return _pdfSettingsCache;
   } catch {
-    return { pdf_header: '', pdf_footer: '' };
+    return { pdf_header: '', pdf_footer: '', pdf_logo: '', pdf_org_name: '' };
   }
 }
 
@@ -701,9 +701,28 @@ async function generatePdf(
   doc.setFontSize(14);
   doc.setFont('helvetica', 'bold');
   doc.text(`Kalender — ${monthLabel} ${year}`, 10, 12);
-  doc.setFontSize(9);
-  doc.setFont('helvetica', 'normal');
-  doc.text('Feuerwehr Rems', 250, 12);
+
+  // Right side: logo and/or org name
+  const logoSize = 14;
+  const logoX = 297 - 4 - logoSize; // 4mm right margin
+  if (pdfSettings.pdf_logo) {
+    try {
+      const fmt = pdfSettings.pdf_logo.match(/^data:image\/(\w+);/)?.[1]?.toUpperCase() ?? 'PNG';
+      doc.addImage(pdfSettings.pdf_logo, fmt === 'JPG' ? 'JPEG' : fmt, logoX, 2, logoSize, logoSize);
+    } catch { /* ignore invalid image */ }
+  }
+  if (pdfSettings.pdf_org_name) {
+    doc.setFontSize(9);
+    doc.setFont('helvetica', 'bold');
+    doc.setTextColor(255, 255, 255);
+    const nameW = doc.getTextWidth(pdfSettings.pdf_org_name);
+    const nameX = (pdfSettings.pdf_logo ? logoX - 3 : 297 - 4) - nameW;
+    doc.text(pdfSettings.pdf_org_name, nameX, 12);
+  } else if (!pdfSettings.pdf_logo) {
+    doc.setFontSize(9);
+    doc.setFont('helvetica', 'normal');
+    doc.text('Feuerwehr Rems', 250, 12);
+  }
 
   // Custom header text
   let tableStartY = 22;
@@ -796,9 +815,28 @@ async function generateBookingsPdf(
   doc.setFontSize(14);
   doc.setFont('helvetica', 'bold');
   doc.text(`Fahrzeugbuchungen — ${kwLabel} · ${startLabel} – ${endLabel}`, 10, 12);
-  doc.setFontSize(9);
-  doc.setFont('helvetica', 'normal');
-  doc.text('Feuerwehr Rems', 250, 12);
+
+  // Right side: logo and/or org name
+  const logoSize = 14;
+  const logoX = 297 - 4 - logoSize;
+  if (pdfSettings.pdf_logo) {
+    try {
+      const fmt = pdfSettings.pdf_logo.match(/^data:image\/(\w+);/)?.[1]?.toUpperCase() ?? 'PNG';
+      doc.addImage(pdfSettings.pdf_logo, fmt === 'JPG' ? 'JPEG' : fmt, logoX, 2, logoSize, logoSize);
+    } catch { /* ignore invalid image */ }
+  }
+  if (pdfSettings.pdf_org_name) {
+    doc.setFontSize(9);
+    doc.setFont('helvetica', 'bold');
+    doc.setTextColor(255, 255, 255);
+    const nameW = doc.getTextWidth(pdfSettings.pdf_org_name);
+    const nameX = (pdfSettings.pdf_logo ? logoX - 3 : 297 - 4) - nameW;
+    doc.text(pdfSettings.pdf_org_name, nameX, 12);
+  } else if (!pdfSettings.pdf_logo) {
+    doc.setFontSize(9);
+    doc.setFont('helvetica', 'normal');
+    doc.text('Feuerwehr Rems', 250, 12);
+  }
 
   // Custom header text
   let tableStartY = 22;
@@ -2747,7 +2785,7 @@ export default function Kalender() {
                 <TableContainer component={Paper} elevation={1}>
                   <Table size="small" sx={{ tableLayout: 'fixed' }}>
                     <TableHead>
-                      <TableRow sx={{ bgcolor: 'grey.100' }}>
+                      <TableRow sx={{ bgcolor: (theme) => theme.palette.mode === 'dark' ? 'grey.900' : 'grey.100' }}>
                         <TableCell sx={{ width: 160, fontWeight: 700 }}>
                           Fahrzeug
                         </TableCell>
@@ -2758,7 +2796,7 @@ export default function Kalender() {
                             sx={{
                               fontWeight: fnsIsToday(day) ? 700 : 400,
                               color: fnsIsToday(day) ? 'primary.main' : 'text.primary',
-                              bgcolor: fnsIsToday(day) ? 'primary.50' : undefined,
+                              bgcolor: fnsIsToday(day) ? (theme) => theme.palette.mode === 'dark' ? 'primary.900' : 'primary.50' : undefined,
                             }}
                           >
                             <Typography variant="caption" display="block">
diff --git a/frontend/src/services/config.ts b/frontend/src/services/config.ts
index e44dd49..c6cb4d8 100644
--- a/frontend/src/services/config.ts
+++ b/frontend/src/services/config.ts
@@ -9,6 +9,8 @@ interface ApiResponse<T> {
 export interface PdfSettings {
   pdf_header: string;
   pdf_footer: string;
+  pdf_logo: string;
+  pdf_org_name: string;
 }
 
 export const configApi = {