fix(catalog): prevent grid card overflow on mobile

lib/main.dart

@@ -19,9 +19,59 @@ class KorkenMosaicApp extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    const seed = Color(0xFF26BFD6);
+    final colorScheme = ColorScheme.fromSeed(
+      seedColor: seed,
+      brightness: Brightness.light,
+    );
+
     return MaterialApp(
       title: 'Korken Mosaic',
-      theme: ThemeData(colorSchemeSeed: Colors.teal, useMaterial3: true),
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        useMaterial3: true,
+        colorScheme: colorScheme,
+        scaffoldBackgroundColor: const Color(0xFFEAF9FF),
+        textTheme: ThemeData.light().textTheme.copyWith(
+              titleLarge: const TextStyle(fontWeight: FontWeight.w700),
+              titleMedium: const TextStyle(fontWeight: FontWeight.w600),
+              bodyLarge: const TextStyle(height: 1.3),
+            ),
+        cardTheme: CardThemeData(
+          elevation: 0,
+          color: Colors.white.withValues(alpha: 0.52),
+          shadowColor: const Color(0x3326BFD6),
+          shape: RoundedRectangleBorder(
+            borderRadius: BorderRadius.circular(22),
+            side: BorderSide(color: Colors.white.withValues(alpha: 0.72)),
+          ),
+        ),
+        inputDecorationTheme: InputDecorationTheme(
+          filled: true,
+          fillColor: Colors.white.withValues(alpha: 0.64),
+          border: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(16),
+            borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.75)),
+          ),
+          enabledBorder: OutlineInputBorder(
+            borderRadius: BorderRadius.circular(16),
+            borderSide: BorderSide(color: Colors.white.withValues(alpha: 0.7)),
+          ),
+        ),
+        navigationBarTheme: NavigationBarThemeData(
+          indicatorColor: const Color(0x804FD6E8),
+          backgroundColor: Colors.white.withValues(alpha: 0.76),
+          labelTextStyle: WidgetStatePropertyAll(
+            TextStyle(color: colorScheme.onSurface, fontWeight: FontWeight.w600),
+          ),
+        ),
+        sliderTheme: SliderThemeData(
+          activeTrackColor: const Color(0xFF26BFD6),
+          inactiveTrackColor: const Color(0x5526BFD6),
+          thumbColor: Colors.white,
+          overlayColor: const Color(0x4026BFD6),
+        ),
+      ),
       home: const MosaicHomePage(),
     );
   }
@@ -650,28 +700,37 @@ class _MosaicHomePageState extends State<MosaicHomePage>
   @override
   Widget build(BuildContext context) {
     return Scaffold(
+      extendBody: true,
       appBar: AppBar(
+        backgroundColor: Colors.white.withValues(alpha: 0.45),
         title: Text(_activeSection == HomeSection.mosaic
-            ? 'Bottle-Cap Mosaic Prototype'
+            ? 'Bottle-Cap Mosaic Studio'
             : 'Cap Catalog'),
       ),
       floatingActionButton: _activeSection == HomeSection.mosaic
           ? FloatingActionButton.extended(
+              backgroundColor: Colors.white.withValues(alpha: 0.85),
+              foregroundColor: Theme.of(context).colorScheme.primary,
               onPressed: _isGenerating ? null : _generate,
               icon: _isGenerating
                   ? const SizedBox(
                       width: 18,
                       height: 18,
                       child: CircularProgressIndicator(strokeWidth: 2))
-                  : const Icon(Icons.auto_fix_high),
+                  : const Icon(Icons.auto_fix_high_rounded),
               label: Text(_isGenerating ? 'Generating…' : 'Generate Mosaic'),
             )
           : null,
-      body: !_isCatalogLoaded
+      body: Stack(
+        children: [
+          const _AeroBackgroundAccents(),
+          !_isCatalogLoaded
               ? const Center(child: CircularProgressIndicator())
               : _activeSection == HomeSection.mosaic
                   ? _buildMosaicScreen()
                   : _buildCatalogScreen(),
+        ],
+      ),
       bottomNavigationBar: NavigationBar(
         selectedIndex: _activeSection.index,
         onDestinationSelected: (index) {
@@ -695,12 +754,13 @@ class _MosaicHomePageState extends State<MosaicHomePage>
 
   Widget _buildMosaicScreen() {
     return Padding(
-      padding: const EdgeInsets.all(12),
+      padding: const EdgeInsets.all(14),
       child: ListView(
         children: [
-          Wrap(
+          _GlassCard(
-            runSpacing: 8,
+            child: Wrap(
-            spacing: 8,
+              runSpacing: 10,
+              spacing: 10,
               crossAxisAlignment: WrapCrossAlignment.center,
               children: [
                 FilledButton.icon(
@@ -708,10 +768,16 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                   icon: const Icon(Icons.image_outlined),
                   label: const Text('Import target image'),
                 ),
-              if (_sourceImageBytes != null) const Text('Image loaded ✅'),
+                if (_sourceImageBytes != null)
+                  const Chip(label: Text('Image loaded ✅')),
               ],
             ),
+          ),
           const SizedBox(height: 12),
+          _GlassCard(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
                 SegmentedButton<bool>(
                   segments: const [
                     ButtonSegment(value: false, label: Text('Grid W x H')),
@@ -723,7 +789,7 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                     _scheduleRegenerate();
                   },
                 ),
-          const SizedBox(height: 8),
+                const SizedBox(height: 10),
                 if (!_useCapSize)
                   Row(
                     children: [
@@ -734,7 +800,7 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                             decoration:
                                 const InputDecoration(labelText: 'Grid Width')),
                       ),
-                const SizedBox(width: 8),
+                      const SizedBox(width: 10),
                       Expanded(
                         child: TextField(
                             controller: _gridHeightCtrl,
@@ -751,29 +817,26 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                     decoration: const InputDecoration(
                         labelText: 'Approx cap size in source image (pixels)'),
                   ),
-          const SizedBox(height: 16),
+              ],
-          const Text('Style Preset',
+            ),
-              style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
+          ),
+          const SizedBox(height: 12),
+          _GlassCard(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text('Style Preset', style: Theme.of(context).textTheme.titleMedium),
                 const SizedBox(height: 8),
                 SegmentedButton<StylePreset>(
                   segments: const [
-              ButtonSegment(
+                    ButtonSegment(value: StylePreset.realistisch, label: Text('Realistisch')),
-                  value: StylePreset.realistisch, label: Text('Realistisch')),
+                    ButtonSegment(value: StylePreset.ausgewogen, label: Text('Ausgewogen')),
-              ButtonSegment(
+                    ButtonSegment(value: StylePreset.kuenstlerisch, label: Text('Künstlerisch')),
-                  value: StylePreset.ausgewogen, label: Text('Ausgewogen')),
-              ButtonSegment(
-                  value: StylePreset.kuenstlerisch,
-                  label: Text('Künstlerisch')),
                   ],
                   selected: {_selectedPreset},
                   onSelectionChanged: (s) => _applyPreset(s.first),
                 ),
                 const SizedBox(height: 8),
-          Card(
-            child: Padding(
-              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
-              child: Column(
-                children: [
                 _SliderRow(
                     label: 'Fidelity ↔ Structure',
                     leftLabel: 'Fidelity',
@@ -813,14 +876,17 @@ class _MosaicHomePageState extends State<MosaicHomePage>
               ],
             ),
           ),
-          ),
+          const SizedBox(height: 14),
-          const SizedBox(height: 16),
           if (_result != null) ...[
-            Text('Preview (${_result!.width} x ${_result!.height})',
+            _GlassCard(
-                style:
+              child: Column(
-                    const TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text('Preview (${_result!.width} x ${_result!.height})', style: Theme.of(context).textTheme.titleMedium),
                   const SizedBox(height: 8),
-            RepaintBoundary(
+                  ClipRRect(
+                    borderRadius: BorderRadius.circular(18),
+                    child: RepaintBoundary(
                       child: AspectRatio(
                         aspectRatio: _result!.width / _result!.height,
                         child: Image.memory(_result!.previewPng,
@@ -829,9 +895,17 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                             gaplessPlayback: true),
                       ),
                     ),
-            const SizedBox(height: 16),
+                  ),
-            const Text('Bill of Materials',
+                ],
-                style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
+              ),
+            ),
+            const SizedBox(height: 12),
+            _GlassCard(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text('Bill of Materials', style: Theme.of(context).textTheme.titleMedium),
+                  const SizedBox(height: 6),
                   ..._result!.sortedCounts.map(
                     (e) => ListTile(
                       dense: true,
@@ -841,6 +915,9 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                     ),
                   ),
                 ],
+              ),
+            ),
+          ],
         ],
       ),
     );
@@ -848,15 +925,16 @@ class _MosaicHomePageState extends State<MosaicHomePage>
 
   Widget _buildCatalogScreen() {
     return Padding(
-      padding: const EdgeInsets.all(12),
+      padding: const EdgeInsets.all(14),
       child: ListView(
         children: [
-          Row(
+          _GlassCard(
+            child: Row(
               children: [
                 IconButton(
                   onPressed: () =>
                       setState(() => _catalogViewMode = CatalogViewMode.list),
-                icon: Icon(Icons.view_list,
+                  icon: Icon(Icons.view_list_rounded,
                       color: _catalogViewMode == CatalogViewMode.list
                           ? Theme.of(context).colorScheme.primary
                           : null),
@@ -865,7 +943,7 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                 IconButton(
                   onPressed: () =>
                       setState(() => _catalogViewMode = CatalogViewMode.grid),
-                icon: Icon(Icons.grid_view,
+                  icon: Icon(Icons.grid_view_rounded,
                       color: _catalogViewMode == CatalogViewMode.grid
                           ? Theme.of(context).colorScheme.primary
                           : null),
@@ -873,7 +951,8 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                 ),
                 const Spacer(),
                 OutlinedButton.icon(
-                  onPressed: _isCaptureFlowInProgress ? null : _captureCapPhoto,
+                    onPressed:
+                        _isCaptureFlowInProgress ? null : _captureCapPhoto,
                     icon: _isCaptureFlowInProgress
                         ? const SizedBox(
                             width: 16,
@@ -885,11 +964,12 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                 const SizedBox(width: 8),
                 IconButton(
                     onPressed: _addCapDialog,
-                  icon: const Icon(Icons.add_circle_outline),
+                    icon: const Icon(Icons.add_circle_outline_rounded),
                     tooltip: 'Manuell hinzufügen'),
               ],
             ),
-          const SizedBox(height: 8),
+          ),
+          const SizedBox(height: 10),
           _buildCatalogView(),
         ],
       ),
@@ -903,7 +983,7 @@ class _MosaicHomePageState extends State<MosaicHomePage>
       return Column(
         children: _catalog
             .map(
-              (entry) => Card(
+              (entry) => _GlassCard(
                 child: ListTile(
                   onTap: () => _editEntry(entry),
                   leading: SizedBox(
@@ -936,15 +1016,17 @@ class _MosaicHomePageState extends State<MosaicHomePage>
       itemCount: _catalog.length,
       gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
         crossAxisCount: 2,
-        childAspectRatio: 1.2,
+        // Mehr vertikaler Platz pro Card, damit Name/Hex/Delete nicht überlaufen.
+        childAspectRatio: 0.92,
         mainAxisSpacing: 8,
         crossAxisSpacing: 8,
       ),
       itemBuilder: (context, index) {
         final entry = _catalog[index];
-        return Card(
+        return _GlassCard(
-          clipBehavior: Clip.antiAlias,
+          padding: EdgeInsets.zero,
           child: InkWell(
+            borderRadius: BorderRadius.circular(22),
             onTap: () => _editEntry(entry),
             child: Padding(
               padding: const EdgeInsets.all(8),
@@ -970,10 +1052,13 @@ class _MosaicHomePageState extends State<MosaicHomePage>
                       const Spacer(),
                       IconButton(
                         visualDensity: VisualDensity.compact,
+                        padding: EdgeInsets.zero,
+                        constraints:
+                            const BoxConstraints.tightFor(width: 30, height: 30),
                         onPressed: _catalog.length <= 1
                             ? null
                             : () => _deleteEntry(entry),
-                        icon: const Icon(Icons.delete_outline),
+                        icon: const Icon(Icons.delete_outline, size: 20),
                       ),
                     ],
                   ),
@@ -1163,12 +1248,16 @@ class _CapPhotoReviewPageState extends State<_CapPhotoReviewPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('Deckel prüfen')),
+      appBar: AppBar(
+        backgroundColor: Colors.white.withValues(alpha: 0.45),
+        title: const Text('Deckel prüfen'),
+      ),
       body: SafeArea(
         child: ListView(
-          padding: const EdgeInsets.all(12),
+          padding: const EdgeInsets.all(14),
           children: [
-            _CircleAdjustOverlay(
+            _GlassCard(
+              child: _CircleAdjustOverlay(
                 imageBytes: widget.imageBytes,
                 imageWidth: _imageW,
                 imageHeight: _imageH,
@@ -1182,6 +1271,7 @@ class _CapPhotoReviewPageState extends State<_CapPhotoReviewPage> {
                   _scheduleLiveRecalculate();
                 },
               ),
+            ),
             const SizedBox(height: 8),
             Text(
               _usedFallback
@@ -1311,6 +1401,104 @@ String _colorToHexStatic(Color color) {
   return '#${color.toARGB32().toRadixString(16).substring(2).toUpperCase()}';
 }
 
+class _AeroBackgroundAccents extends StatelessWidget {
+  const _AeroBackgroundAccents();
+
+  @override
+  Widget build(BuildContext context) {
+    return IgnorePointer(
+      child: Container(
+        decoration: const BoxDecoration(
+          gradient: LinearGradient(
+            begin: Alignment.topLeft,
+            end: Alignment.bottomRight,
+            colors: [Color(0xFFEFFFFF), Color(0xFFE9F8FF), Color(0xFFE8FFF3)],
+          ),
+        ),
+        child: Stack(
+          children: [
+            Positioned(
+              left: -80,
+              top: -90,
+              child: _AccentBlob(size: 260, color: Color(0x5524D8FF)),
+            ),
+            Positioned(
+              right: -60,
+              top: 120,
+              child: _AccentBlob(size: 200, color: Color(0x4452E3FF)),
+            ),
+            Positioned(
+              left: 40,
+              bottom: -70,
+              child: _AccentBlob(size: 220, color: Color(0x4448E6AA)),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _AccentBlob extends StatelessWidget {
+  final double size;
+  final Color color;
+
+  const _AccentBlob({required this.size, required this.color});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      width: size,
+      height: size,
+      decoration: BoxDecoration(
+        color: color,
+        borderRadius: BorderRadius.circular(size),
+        boxShadow: [
+          BoxShadow(
+            color: color.withValues(alpha: 0.35),
+            blurRadius: 36,
+            spreadRadius: 2,
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _GlassCard extends StatelessWidget {
+  final Widget child;
+  final EdgeInsetsGeometry padding;
+
+  const _GlassCard({required this.child, this.padding = const EdgeInsets.all(12)});
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      child: Container(
+        decoration: BoxDecoration(
+          borderRadius: BorderRadius.circular(22),
+          gradient: LinearGradient(
+            begin: Alignment.topLeft,
+            end: Alignment.bottomRight,
+            colors: [
+              Colors.white.withValues(alpha: 0.65),
+              Colors.white.withValues(alpha: 0.34),
+            ],
+          ),
+          boxShadow: const [
+            BoxShadow(
+              color: Color(0x2226BFD6),
+              blurRadius: 16,
+              offset: Offset(0, 8),
+            ),
+          ],
+        ),
+        child: Padding(padding: padding, child: child),
+      ),
+    );
+  }
+}
+
 class _CapThumb extends StatelessWidget {
   final CapCatalogEntry entry;
   final bool large;