frontend/src/App.tsx

@@ -12,6 +12,8 @@ import {
   RotateCcw,
   Palette,
   HelpCircle,
+  Plus,
+  X,
 } from 'lucide-react';
 import { AuthStatus, DashboardStats, SharedList, Thought, User } from './lib/types';
 import {
@@ -118,6 +120,10 @@ export const App: React.FC = () => {
   const [showProfileMenu, setShowProfileMenu] = useState(false);
   const dropdownRef = useRef<HTMLDivElement | null>(null);
 
+  // Mobile Navigation & Quick-Action State
+  const [showMobileCapture, setShowMobileCapture] = useState(false);
+  const [showMobileProfile, setShowMobileProfile] = useState(false);
+
   const handleOpenHelp = () => {
     triggerHaptic(10);
     setPreviousTab((prev) => (activeTab === 'help' ? prev : activeTab));
@@ -273,8 +279,12 @@ export const App: React.FC = () => {
 
   const handleTriggerAddButton = () => {
     triggerHaptic(20);
-    window.scrollTo({ top: 0, behavior: 'smooth' });
+    if (window.innerWidth < 640) {
-    setCaptureFocusCount((c) => c + 1);
+      setShowMobileCapture(true);
+    } else {
+      window.scrollTo({ top: 0, behavior: 'smooth' });
+      setCaptureFocusCount((c) => c + 1);
+    }
   };
 
   const handleLogout = async () => {
@@ -322,7 +332,26 @@ export const App: React.FC = () => {
     <div className="min-h-screen bg-canvas text-main flex flex-col font-sans selection:bg-accent/30">
       {/* Top Header Bar */}
       <header className="sticky top-0 z-30 bg-panel border-b border-border shadow-sm">
-        <div className="max-w-6xl mx-auto px-3 sm:px-4 py-2 flex items-start justify-between gap-3 sm:gap-6">
+        {/* Mobile Header: Centered Logo & Instance Title */}
+        <div className="sm:hidden flex items-center justify-center relative h-11 px-4">
+          <div
+            onClick={() => {
+              triggerHaptic(10);
+              setActiveTab('triage');
+            }}
+            className="flex items-center gap-2 cursor-pointer select-none"
+          >
+            <div className="w-6 h-6 bg-accent text-on-accent rounded-btn flex items-center justify-center">
+              <Brain className="w-3.5 h-3.5" />
+            </div>
+            <span className="font-bold text-sm text-main tracking-tight">
+              {authStatus.instanceName || 'MindSift'}
+            </span>
+          </div>
+        </div>
+
+        {/* Desktop Header: 3-column Layout (Logo, InstantCaptureBar, Profile Pill) */}
+        <div className="hidden sm:flex max-w-6xl mx-auto px-4 py-2 items-start justify-between gap-6">
           {/* Logo & Headline */}
           <div
             onClick={() => {
@@ -471,8 +500,8 @@ export const App: React.FC = () => {
           </div>
         </div>
 
-        {/* Navigation tabs attached to header */}
+        {/* Desktop Navigation tabs attached to header */}
-        <nav className="max-w-6xl mx-auto px-1 sm:px-2 border-t border-border flex items-stretch justify-between">
+        <nav className="hidden sm:flex max-w-6xl mx-auto px-2 border-t border-border items-stretch justify-between">
           <div className="flex items-stretch overflow-x-auto no-scrollbar">
             <button
               onClick={() => {
@@ -559,7 +588,7 @@ export const App: React.FC = () => {
       </header>
 
       {/* Main Container */}
-      <main className="flex-1 max-w-6xl w-full mx-auto px-3 sm:px-4 pt-3 pb-6">
+      <main className="flex-1 max-w-6xl w-full mx-auto px-3 sm:px-4 pt-3 pb-24 sm:pb-6">
         <ViewErrorBoundary onReset={() => setActiveTab('triage')}>
           <section>
             {activeTab === 'triage' && (
@@ -618,6 +647,286 @@ export const App: React.FC = () => {
           </section>
         </ViewErrorBoundary>
       </main>
+
+      {/* MOBILE BOTTOM NAVIGATION BAR */}
+      <nav className="sm:hidden fixed bottom-0 left-0 right-0 z-40 bg-panel/95 backdrop-blur-md border-t border-border px-3 py-1 flex items-center justify-around pb-[calc(0.4rem+env(safe-area-inset-bottom))] shadow-panel">
+        {/* Tab 1: Triage */}
+        <button
+          type="button"
+          onClick={() => {
+            triggerHaptic(10);
+            setActiveTab('triage');
+          }}
+          className={`p-2 rounded-btn flex flex-col items-center justify-center transition-colors relative cursor-pointer ${
+            activeTab === 'triage' ? 'text-accent' : 'text-muted hover:text-main'
+          }`}
+          title="Triage"
+        >
+          <Layers className="w-5 h-5" />
+          {stats.inboxCount > 0 && (
+            <span className="absolute -top-0.5 -right-0.5 min-w-[15px] h-[15px] px-0.5 rounded-full text-[9px] font-bold leading-none bg-accent text-on-accent flex items-center justify-center shadow-xs pointer-events-none">
+              {stats.inboxCount}
+            </span>
+          )}
+        </button>
+
+        {/* Tab 2: Aufgaben */}
+        <button
+          type="button"
+          onClick={() => {
+            triggerHaptic(10);
+            setActiveTab('tasks');
+          }}
+          className={`p-2 rounded-btn flex flex-col items-center justify-center transition-colors relative cursor-pointer ${
+            activeTab === 'tasks' ? 'text-accent' : 'text-muted hover:text-main'
+          }`}
+          title="Aufgaben"
+        >
+          <CheckSquare className="w-5 h-5" />
+          {stats.tasksOpenCount > 0 && (
+            <span className="absolute -top-0.5 -right-0.5 min-w-[15px] h-[15px] px-0.5 rounded-full text-[9px] font-bold leading-none bg-accent text-on-accent flex items-center justify-center shadow-xs pointer-events-none">
+              {stats.tasksOpenCount}
+            </span>
+          )}
+        </button>
+
+        {/* CENTER ACTION: + Quick-Add FAB */}
+        <button
+          type="button"
+          onClick={() => {
+            triggerHaptic(15);
+            setShowMobileCapture(true);
+          }}
+          className="w-12 h-12 -mt-5 rounded-full bg-accent text-on-accent shadow-lg flex items-center justify-center active:scale-90 transition-transform border-4 border-panel cursor-pointer"
+          title="Schnell erfassen (+)"
+        >
+          <Plus className="w-6 h-6 stroke-[2.5]" />
+        </button>
+
+        {/* Tab 3: Workspace */}
+        <button
+          type="button"
+          onClick={() => {
+            triggerHaptic(10);
+            setActiveTab('workspace');
+          }}
+          className={`p-2 rounded-btn flex flex-col items-center justify-center transition-colors relative cursor-pointer ${
+            activeTab === 'workspace' ? 'text-accent' : 'text-muted hover:text-main'
+          }`}
+          title="Workspace"
+        >
+          <FileText className="w-5 h-5" />
+          {(stats.docsTodosOpenCount ?? 0) > 0 && (
+            <span className="absolute -top-0.5 -right-0.5 min-w-[15px] h-[15px] px-0.5 rounded-full text-[9px] font-bold leading-none bg-accent text-on-accent flex items-center justify-center shadow-xs pointer-events-none">
+              {stats.docsTodosOpenCount}
+            </span>
+          )}
+        </button>
+
+        {/* Tab 4: Listen */}
+        <button
+          type="button"
+          onClick={() => {
+            triggerHaptic(10);
+            setActiveTab('lists');
+          }}
+          className={`p-2 rounded-btn flex flex-col items-center justify-center transition-colors relative cursor-pointer ${
+            activeTab === 'lists' ? 'text-accent' : 'text-muted hover:text-main'
+          }`}
+          title="Listen"
+        >
+          <ShoppingCart className="w-5 h-5" />
+        </button>
+
+        {/* User Profile Avatar */}
+        <button
+          type="button"
+          onClick={() => {
+            triggerHaptic(10);
+            setShowMobileProfile(true);
+          }}
+          className={`p-1.5 rounded-btn flex items-center justify-center transition-colors cursor-pointer ${
+            activeTab === 'user_settings' || activeTab === 'admin_settings' || activeTab === 'help'
+              ? 'ring-2 ring-accent'
+              : 'opacity-85 hover:opacity-100'
+          }`}
+          title="Profil & Einstellungen"
+        >
+          <div className="w-6 h-6 rounded-full bg-accent text-on-accent text-[11px] font-bold flex items-center justify-center">
+            {user.displayName ? user.displayName.slice(0, 1).toUpperCase() : 'U'}
+          </div>
+        </button>
+      </nav>
+
+      {/* MOBILE QUICK-ADD BOTTOM SHEET / MODAL */}
+      {showMobileCapture && (
+        <div
+          className="sm:hidden fixed inset-0 z-50 flex items-end justify-center bg-black/60 backdrop-blur-xs animate-in fade-in duration-150"
+          onClick={() => setShowMobileCapture(false)}
+        >
+          <div
+            className="w-full bg-panel border-t border-border rounded-t-2xl shadow-panel p-4 pb-[calc(1.5rem+env(safe-area-inset-bottom))] animate-in slide-in-from-bottom duration-200"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* Header */}
+            <div className="flex items-center justify-between pb-3 border-b border-border mb-3">
+              <div className="flex items-center gap-2">
+                <div className="w-6 h-6 rounded-btn bg-accent/15 text-accent flex items-center justify-center">
+                  <Plus className="w-4 h-4" />
+                </div>
+                <h3 className="text-sm font-semibold text-main">Schnell erfassen</h3>
+              </div>
+              <button
+                type="button"
+                onClick={() => setShowMobileCapture(false)}
+                className="p-1 text-faint hover:text-main rounded-btn transition-colors cursor-pointer"
+              >
+                <X className="w-5 h-5" />
+              </button>
+            </div>
+
+            {/* InstantCaptureBar */}
+            <div className="pt-1">
+              <InstantCaptureBar
+                onCaptured={(thought, target) => {
+                  handleCaptured(thought, target);
+                  setShowMobileCapture(false);
+                }}
+                lists={lists}
+                autoFocusTrigger={Date.now()}
+              />
+            </div>
+          </div>
+        </div>
+      )}
+
+      {/* MOBILE USER PROFILE SHEET */}
+      {showMobileProfile && (
+        <div
+          className="sm:hidden fixed inset-0 z-50 flex items-end justify-center bg-black/60 backdrop-blur-xs animate-in fade-in duration-150"
+          onClick={() => setShowMobileProfile(false)}
+        >
+          <div
+            className="w-full max-h-[85vh] overflow-y-auto bg-panel border-t border-border rounded-t-2xl shadow-panel p-4 pb-[calc(1.5rem+env(safe-area-inset-bottom))] space-y-4 animate-in slide-in-from-bottom duration-200 divide-y divide-border"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* User Info Header */}
+            <div className="flex items-center justify-between pb-2">
+              <div className="flex items-center gap-3">
+                <div className="w-10 h-10 rounded-full bg-accent text-on-accent text-sm font-bold flex items-center justify-center flex-shrink-0">
+                  {user.displayName ? user.displayName.slice(0, 1).toUpperCase() : 'U'}
+                </div>
+                <div>
+                  <p className="font-bold text-sm text-main">{user.displayName}</p>
+                  <p className="text-xs text-muted">{user.email}</p>
+                  <span className="inline-block mt-1 px-1.5 py-0.5 bg-canvas border border-border rounded-btn text-[10px] text-accent font-semibold">
+                    {roleLabel}
+                  </span>
+                </div>
+              </div>
+              <button
+                type="button"
+                onClick={() => setShowMobileProfile(false)}
+                className="p-1 text-faint hover:text-main rounded-btn transition-colors cursor-pointer"
+              >
+                <X className="w-5 h-5" />
+              </button>
+            </div>
+
+            {/* Theme Quick Switcher */}
+            <div className="pt-3 space-y-2">
+              <span className="text-[11px] font-semibold text-muted uppercase tracking-wider flex items-center gap-1.5">
+                <Palette className="w-3.5 h-3.5 text-accent" />
+                <span>Design-Theme</span>
+              </span>
+              <div className="grid grid-cols-2 gap-2">
+                {AVAILABLE_THEMES.map((t) => (
+                  <button
+                    key={t.id}
+                    type="button"
+                    onClick={() => handleChangeTheme(t.id)}
+                    className={`h-9 px-2.5 text-xs font-medium border rounded-btn flex items-center gap-2 transition-colors cursor-pointer ${
+                      activeTheme === t.id
+                        ? 'bg-panel-elevated border-accent text-main font-semibold'
+                        : 'bg-canvas border-border text-muted hover:text-main'
+                    }`}
+                  >
+                    <span
+                      className="w-3 h-3 border border-strong flex-shrink-0 rounded-full"
+                      style={{ backgroundColor: t.previewBg }}
+                    />
+                    <span className="truncate">{t.name.replace('MindSift ', '')}</span>
+                  </button>
+                ))}
+              </div>
+            </div>
+
+            {/* Menu Items */}
+            <div className="pt-3 space-y-1">
+              <button
+                type="button"
+                onClick={() => {
+                  triggerHaptic(10);
+                  setShowMobileProfile(false);
+                  setActiveTab('user_settings');
+                }}
+                className={`w-full px-3 py-2.5 rounded-btn text-left flex items-center gap-3 hover:bg-panel-elevated transition-colors text-xs cursor-pointer ${
+                  activeTab === 'user_settings' ? 'text-accent font-semibold bg-panel-elevated' : 'text-main'
+                }`}
+              >
+                <Settings className="w-4 h-4 text-accent" />
+                <span>Kontoeinstellungen</span>
+              </button>
+
+              <button
+                type="button"
+                onClick={() => {
+                  setShowMobileProfile(false);
+                  handleOpenHelp();
+                }}
+                className={`w-full px-3 py-2.5 rounded-btn text-left flex items-center gap-3 hover:bg-panel-elevated transition-colors text-xs cursor-pointer ${
+                  activeTab === 'help' ? 'text-accent font-semibold bg-panel-elevated' : 'text-main'
+                }`}
+              >
+                <HelpCircle className="w-4 h-4 text-accent" />
+                <span>Hilfe & Anleitung</span>
+              </button>
+
+              {isStaff && (
+                <button
+                  type="button"
+                  onClick={() => {
+                    triggerHaptic(10);
+                    setShowMobileProfile(false);
+                    setActiveTab('admin_settings');
+                  }}
+                  className={`w-full px-3 py-2.5 rounded-btn text-left flex items-center gap-3 hover:bg-panel-elevated transition-colors text-xs cursor-pointer ${
+                    activeTab === 'admin_settings' ? 'text-accent font-semibold bg-panel-elevated' : 'text-main'
+                  }`}
+                >
+                  <Shield className="w-4 h-4 text-accent" />
+                  <span>Administration</span>
+                </button>
+              )}
+            </div>
+
+            {/* Logout */}
+            <div className="pt-3">
+              <button
+                type="button"
+                onClick={() => {
+                  setShowMobileProfile(false);
+                  handleLogout();
+                }}
+                className="w-full px-3 py-2.5 rounded-btn text-left flex items-center gap-3 text-status-err hover:bg-status-err-bg transition-colors text-xs font-medium cursor-pointer"
+              >
+                <LogOut className="w-4 h-4" />
+                <span>Abmelden</span>
+              </button>
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   );
 };