diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..263e3bb
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,12 @@
+# TODO
+
+## Internacionalización AAA
+
+- [ ] Repasar absolutamente todos los literales de la aplicación en todas las pantallas, componentes, servicios con mensajes visibles y notificaciones.
+- [ ] Diseñar una arquitectura de internacionalización profesional con ficheros separados por idioma.
+- [ ] Permitir que el usuario cambie el idioma manualmente desde la aplicación, sin depender únicamente del idioma del sistema.
+- [ ] Soportar formatos locales de fecha, hora, números y duración.
+- [ ] Resolver correctamente singular/plural y variantes por cantidad, por ejemplo `1 emisora` vs `2 emisoras`.
+- [ ] Preparar traducciones para la mayoría de idiomas más usados del planeta.
+- [ ] Revisar la aplicación de Farolero como referencia para detectar el conjunto de idiomas que nos interesa mantener.
+- [ ] Verificar que no queda ningún literal hardcodeado fuera del sistema de traducciones.
diff --git a/lib/app.dart b/lib/app.dart
index d086cd3..c0d42bf 100644
--- a/lib/app.dart
+++ b/lib/app.dart
@@ -11,8 +11,9 @@ import 'pantallas/pantalla_buscar.dart';
 import 'pantallas/pantalla_favoritos.dart';
 import 'pantallas/pantalla_ajustes.dart';
 import 'tema/pluriwave_theme.dart';
-import 'widgets/pluri_glass_surface.dart';
+import 'widgets/pluri_bottom_navigation.dart';
 import 'widgets/pluri_icon.dart';
+import 'widgets/pluri_layout.dart';
 import 'widgets/pluri_wave_scaffold.dart';
 import 'package:pluriwave/widgets/mini_reproductor.dart';
 import 'servicios/servicio_alarmas_android.dart';
@@ -62,45 +63,25 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
     PantallaAjustes(),
   ];
 
-  static const _destinos = [
-    NavigationDestination(
-      icon: PluriIcon(glyph: PluriIconGlyph.home),
-      selectedIcon: PluriIcon(
-        glyph: PluriIconGlyph.home,
-        variant: PluriIconVariant.activeGlow,
-      ),
+  static const _navItems = [
+    PluriNavItem(
+      glyph: PluriIconGlyph.home,
       label: 'Inicio',
     ),
-    NavigationDestination(
-      icon: PluriIcon(glyph: PluriIconGlyph.search),
-      selectedIcon: PluriIcon(
-        glyph: PluriIconGlyph.search,
-        variant: PluriIconVariant.activeGlow,
-      ),
+    PluriNavItem(
+      glyph: PluriIconGlyph.search,
       label: 'Buscar',
     ),
-    NavigationDestination(
-      icon: PluriIcon(glyph: PluriIconGlyph.favorites),
-      selectedIcon: PluriIcon(
-        glyph: PluriIconGlyph.favorites,
-        variant: PluriIconVariant.activeGlow,
-      ),
+    PluriNavItem(
+      glyph: PluriIconGlyph.favorites,
       label: 'Favoritos',
     ),
-    NavigationDestination(
-      icon: PluriIcon(glyph: PluriIconGlyph.alarm),
-      selectedIcon: PluriIcon(
-        glyph: PluriIconGlyph.alarm,
-        variant: PluriIconVariant.activeGlow,
-      ),
+    PluriNavItem(
+      glyph: PluriIconGlyph.alarm,
       label: 'Alarmas',
     ),
-    NavigationDestination(
-      icon: PluriIcon(glyph: PluriIconGlyph.settings),
-      selectedIcon: PluriIcon(
-        glyph: PluriIconGlyph.settings,
-        variant: PluriIconVariant.activeGlow,
-      ),
+    PluriNavItem(
+      glyph: PluriIconGlyph.settings,
       label: 'Ajustes',
     ),
   ];
@@ -158,30 +139,47 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
         actions: [
           IconButton(
             icon: const Icon(Icons.bedtime_outlined),
-            tooltip: 'Timer de sueno',
+            tooltip: 'Timer de sueño',
             onPressed: () => _mostrarTimerDialog(context),
           ),
         ],
       ),
-      body: SafeArea(top: false, child: _paginas[_indice]),
+      body: SafeArea(
+        top: false,
+        child: AnimatedSwitcher(
+          duration: context.pluriMotion.normal,
+          switchInCurve: Curves.easeOutCubic,
+          switchOutCurve: Curves.easeInCubic,
+          transitionBuilder:
+              (child, animation) => FadeTransition(
+                opacity: animation,
+                child: SlideTransition(
+                  position: Tween<Offset>(
+                    begin: const Offset(0.035, 0),
+                    end: Offset.zero,
+                  ).animate(animation),
+                  child: child,
+                ),
+              ),
+          child: KeyedSubtree(
+            key: ValueKey<int>(_indice),
+            child: _paginas[_indice],
+          ),
+        ),
+      ),
       bottomNavigationBar: SafeArea(
         top: false,
-        minimum: const EdgeInsets.only(bottom: 8),
+        minimum: const EdgeInsets.only(bottom: PluriLayout.compactGap),
         child: Padding(
-          padding: const EdgeInsets.fromLTRB(12, 0, 12, 0),
+          padding: const EdgeInsets.fromLTRB(8, 0, 8, 0),
           child: Column(
             mainAxisSize: MainAxisSize.min,
             children: [
               const MiniReproductor(),
-              PluriGlassSurface(
-                padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 4),
-                borderRadius: BorderRadius.circular(999),
-                child: NavigationBar(
-                  selectedIndex: _indice,
-                  height: 66,
-                  onDestinationSelected: (i) => setState(() => _indice = i),
-                  destinations: _destinos,
-                ),
+              PluriBottomNavigation(
+                items: _navItems,
+                selectedIndex: _indice,
+                onSelected: (i) => setState(() => _indice = i),
               ),
             ],
           ),
@@ -241,74 +239,210 @@ class _PaginaPrincipalState extends State<_PaginaPrincipal> {
   }
 
   void _mostrarTimerDialog(BuildContext context) {
-    final estado = context.read<EstadoRadio>();
     showModalBottomSheet(
       context: context,
+      showDragHandle: true,
       builder:
-          (ctx) => SafeArea(
-            child: Padding(
-              padding: const EdgeInsets.all(24),
-              child: Column(
-                mainAxisSize: MainAxisSize.min,
-                crossAxisAlignment: CrossAxisAlignment.start,
-                children: [
-                  Text(
-                    'Timer de sueño',
-                    style: Theme.of(ctx).textTheme.titleLarge,
-                  ),
-                  const SizedBox(height: 16),
-                  if (estado.timer.activo)
-                    StreamBuilder<Duration>(
-                      stream: estado.timer.tiempoRestanteStream,
-                      builder: (ctx, snap) {
-                        final t = snap.data ?? Duration.zero;
-                        final h = t.inHours;
-                        final m = t.inMinutes
-                            .remainder(60)
-                            .toString()
-                            .padLeft(2, '0');
-                        final s = t.inSeconds
-                            .remainder(60)
-                            .toString()
-                            .padLeft(2, '0');
-                        return Column(
-                          children: [
-                            Text(
-                              '${h > 0 ? "${h}h " : ""}${m}m ${s}s',
-                              style: Theme.of(ctx).textTheme.headlineMedium,
-                            ),
-                            const SizedBox(height: 8),
-                            FilledButton.tonal(
+          (ctx) => Consumer<EstadoRadio>(
+            builder: (ctx, estado, _) => SafeArea(
+              child: Padding(
+                padding: PluriLayout.sheetPadding,
+                child: Column(
+                  mainAxisSize: MainAxisSize.min,
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text(
+                      'Timer de sueño',
+                      style: Theme.of(ctx).textTheme.titleLarge,
+                    ),
+                    const SizedBox(height: PluriLayout.sectionGap),
+                    Text(
+                      'Apagado suave de la radio con cuenta atrás exacta.',
+                      style: Theme.of(ctx).textTheme.bodySmall,
+                    ),
+                    const SizedBox(height: PluriLayout.panelGap),
+                    if (estado.timer.activo)
+                      StreamBuilder<Duration>(
+                        stream: estado.timer.tiempoRestanteStream,
+                        builder: (ctx, snap) {
+                          final restante =
+                              snap.data ?? estado.timer.tiempoRestante;
+                          return Column(
+                            crossAxisAlignment: CrossAxisAlignment.stretch,
+                            children: [
+                              Text(
+                                _formatearDuracionTimer(restante),
+                                style: Theme.of(ctx).textTheme.headlineMedium,
+                              ),
+                              const SizedBox(height: PluriLayout.compactGap),
+                              FilledButton.tonal(
+                                onPressed: () {
+                                  estado.cancelarTimer();
+                                  Navigator.pop(ctx);
+                                },
+                                child: const Text('Cancelar timer'),
+                              ),
+                            ],
+                          );
+                        },
+                      )
+                    else
+                      Wrap(
+                        spacing: PluriLayout.compactGap,
+                        runSpacing: PluriLayout.compactGap,
+                        children: [
+                          for (final segundos
+                              in estado.timerSuenoPresetsSegundos)
+                            ActionChip(
+                              label: Text(
+                                _formatearDuracionTimer(
+                                  Duration(seconds: segundos),
+                                ),
+                              ),
                               onPressed: () {
-                                estado.cancelarTimer();
+                                estado.iniciarTimerDuracion(
+                                  Duration(seconds: segundos),
+                                );
                                 Navigator.pop(ctx);
                               },
-                              child: const Text('Cancelar timer'),
                             ),
-                          ],
-                        );
-                      },
-                    )
-                  else
-                    Wrap(
-                      spacing: 8,
-                      children:
-                          [3, 5, 10, 15, 30, 60, 90, 120, 180]
-                              .map(
-                                (min) => ActionChip(
-                                  label: Text('$min min'),
-                                  onPressed: () {
-                                    estado.iniciarTimer(min);
-                                    Navigator.pop(ctx);
-                                  },
-                                ),
-                              )
-                              .toList(),
-                    ),
-                ],
+                          ActionChip(
+                            avatar: const Icon(Icons.tune_rounded, size: 18),
+                            label: const Text('Otro'),
+                            onPressed: () async {
+                              final duracion =
+                                  await _pedirDuracionPersonalizada(ctx);
+                              if (duracion == null || !ctx.mounted) return;
+                              estado.iniciarTimerDuracion(duracion);
+                              Navigator.pop(ctx);
+                            },
+                          ),
+                        ],
+                      ),
+                  ],
+                ),
               ),
             ),
           ),
     );
   }
+
+  Future<Duration?> _pedirDuracionPersonalizada(BuildContext context) {
+    return showModalBottomSheet<Duration>(
+      context: context,
+      isScrollControlled: true,
+      showDragHandle: true,
+      builder: (ctx) => const _TimerPersonalizadoSheet(),
+    );
+  }
+}
+
+String _formatearDuracionTimer(Duration duracion) {
+  final horas = duracion.inHours;
+  final minutos = duracion.inMinutes.remainder(60);
+  final segundos = duracion.inSeconds.remainder(60);
+  if (horas > 0) {
+    return '${horas}h ${minutos.toString().padLeft(2, '0')}m ${segundos.toString().padLeft(2, '0')}s';
+  }
+  if (minutos > 0) {
+    return segundos == 0 ? '$minutos min' : '${minutos}m ${segundos}s';
+  }
+  return '$segundos s';
+}
+
+class _TimerPersonalizadoSheet extends StatefulWidget {
+  const _TimerPersonalizadoSheet();
+
+  @override
+  State<_TimerPersonalizadoSheet> createState() =>
+      _TimerPersonalizadoSheetState();
+}
+
+class _TimerPersonalizadoSheetState extends State<_TimerPersonalizadoSheet> {
+  final _horasCtrl = TextEditingController();
+  final _minutosCtrl = TextEditingController(text: '15');
+  final _segundosCtrl = TextEditingController();
+  bool _guardarPreset = true;
+
+  @override
+  void dispose() {
+    _horasCtrl.dispose();
+    _minutosCtrl.dispose();
+    _segundosCtrl.dispose();
+    super.dispose();
+  }
+
+  int _leer(TextEditingController ctrl) => int.tryParse(ctrl.text.trim()) ?? 0;
+
+  Future<void> _confirmar() async {
+    final duracion = Duration(
+      hours: _leer(_horasCtrl),
+      minutes: _leer(_minutosCtrl),
+      seconds: _leer(_segundosCtrl),
+    );
+    if (duracion <= Duration.zero) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Elegí una duración mayor que cero.')),
+      );
+      return;
+    }
+    if (_guardarPreset) {
+      await context.read<EstadoRadio>().agregarTimerSuenoPreset(duracion);
+    }
+    if (mounted) Navigator.pop(context, duracion);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final bottom = MediaQuery.viewInsetsOf(context).bottom;
+    return SafeArea(
+      child: Padding(
+        padding: EdgeInsets.fromLTRB(18, 0, 18, 18 + bottom),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Text(
+              'Duración personalizada',
+              style: Theme.of(context).textTheme.titleLarge,
+            ),
+            const SizedBox(height: PluriLayout.sectionGap),
+            Row(
+              children: [
+                Expanded(child: _campoTiempo(_horasCtrl, 'Horas')),
+                const SizedBox(width: PluriLayout.compactGap),
+                Expanded(child: _campoTiempo(_minutosCtrl, 'Minutos')),
+                const SizedBox(width: PluriLayout.compactGap),
+                Expanded(child: _campoTiempo(_segundosCtrl, 'Segundos')),
+              ],
+            ),
+            const SizedBox(height: PluriLayout.compactGap),
+            SwitchListTile.adaptive(
+              contentPadding: EdgeInsets.zero,
+              title: const Text('Guardar como acceso rápido'),
+              value: _guardarPreset,
+              onChanged: (value) => setState(() => _guardarPreset = value),
+            ),
+            const SizedBox(height: PluriLayout.sectionGap),
+            FilledButton.icon(
+              icon: const Icon(Icons.bedtime_rounded),
+              label: const Text('Iniciar timer'),
+              onPressed: _confirmar,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _campoTiempo(TextEditingController controller, String label) {
+    return TextField(
+      controller: controller,
+      keyboardType: TextInputType.number,
+      decoration: InputDecoration(
+        labelText: label,
+        border: const OutlineInputBorder(),
+      ),
+    );
+  }
 }
diff --git a/lib/estado/estado_radio.dart b/lib/estado/estado_radio.dart
index 85a27aa..ec10903 100644
--- a/lib/estado/estado_radio.dart
+++ b/lib/estado/estado_radio.dart
@@ -87,6 +87,21 @@ class EstadoRadio extends ChangeNotifier {
   String? _ultimoTagBusqueda;
   String? _errorCarga;
   static const _keyEmisoraPreferida = 'emisora_preferida_uuid_v1';
+  static const _keyTimerSuenoPresets = 'timer_sueno_presets_segundos_v1';
+  static const _timerSuenoPresetsDefecto = <int>[
+    180,
+    300,
+    600,
+    900,
+    1800,
+    3600,
+    5400,
+    7200,
+    10800,
+  ];
+  List<int> _timerSuenoPresetsSegundos = List<int>.from(
+    _timerSuenoPresetsDefecto,
+  );
 
   List<Emisora> get populares => _populares;
   List<Emisora> get tendencias => _tendencias;
@@ -110,6 +125,8 @@ class EstadoRadio extends ChangeNotifier {
   PresetEcualizador get presetPrincipalEcualizador => _presetPrincipal;
   bool get ecualizadorActivo => _ecualizadorActivo;
   bool get ecualizadorDisponible => audio.ecualizadorDisponible;
+  List<int> get timerSuenoPresetsSegundos =>
+      List<int>.unmodifiable(_timerSuenoPresetsSegundos);
 
   bool get emisoraActualEsFavorita {
     final actual = emisoraActual;
@@ -171,6 +188,7 @@ class EstadoRadio extends ChangeNotifier {
     await grabacion.inicializar();
     await _cargarEcualizadorPersistido();
     await _cargarEmisoraPreferida();
+    await _cargarTimerSuenoPresets();
     await Future.wait([
       cargarPopulares(),
       cargarFavoritos(),
@@ -260,6 +278,29 @@ class EstadoRadio extends ChangeNotifier {
     await reproducir(preferida);
   }
 
+  Future<void> _cargarTimerSuenoPresets() async {
+    try {
+      final prefs = await SharedPreferences.getInstance();
+      final raw = prefs.getString(_keyTimerSuenoPresets);
+      if (raw == null) return;
+      final decoded = jsonDecode(raw);
+      if (decoded is! List) return;
+      final presets =
+          decoded
+              .whereType<num>()
+              .map((n) => n.toInt())
+              .where((s) => s > 0)
+              .toSet()
+              .toList()
+            ..sort();
+      if (presets.isNotEmpty) {
+        _timerSuenoPresetsSegundos = presets.take(12).toList();
+      }
+    } catch (_) {
+      _timerSuenoPresetsSegundos = List<int>.from(_timerSuenoPresetsDefecto);
+    }
+  }
+
   Future<void> _cargarEmisoraPreferida() async {
     final prefs = await SharedPreferences.getInstance();
     _emisoraPreferidaUuid = prefs.getString(_keyEmisoraPreferida);
@@ -749,11 +790,56 @@ class EstadoRadio extends ChangeNotifier {
     notifyListeners();
   }
 
+  void iniciarTimerDuracion(Duration duracion) {
+    timer.iniciarDuracion(duracion);
+    notifyListeners();
+  }
+
   void cancelarTimer() {
     unawaited(timer.cancelar());
     notifyListeners();
   }
 
+  Future<void> guardarTimerSuenoPresetsSegundos(List<int> segundos) async {
+    final normalizados =
+        segundos
+            .where((s) => s > 0)
+            .map((s) => s.clamp(1, const Duration(hours: 23).inSeconds))
+            .toSet()
+            .toList()
+          ..sort();
+    _timerSuenoPresetsSegundos =
+        normalizados.isEmpty
+            ? List<int>.from(_timerSuenoPresetsDefecto)
+            : normalizados.take(12).toList();
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(
+      _keyTimerSuenoPresets,
+      jsonEncode(_timerSuenoPresetsSegundos),
+    );
+    notifyListeners();
+  }
+
+  Future<void> agregarTimerSuenoPreset(Duration duracion) async {
+    await guardarTimerSuenoPresetsSegundos([
+      ..._timerSuenoPresetsSegundos,
+      duracion.inSeconds,
+    ]);
+  }
+
+  Future<void> eliminarTimerSuenoPreset(int segundos) async {
+    await guardarTimerSuenoPresetsSegundos(
+      _timerSuenoPresetsSegundos.where((s) => s != segundos).toList(),
+    );
+  }
+
+  Future<void> restaurarTimerSuenoPresets() async {
+    _timerSuenoPresetsSegundos = List<int>.from(_timerSuenoPresetsDefecto);
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.remove(_keyTimerSuenoPresets);
+    notifyListeners();
+  }
+
   @override
   void dispose() {
     _suscripcionEstadoAudio?.cancel();
diff --git a/lib/pantallas/pantalla_ajustes.dart b/lib/pantallas/pantalla_ajustes.dart
index 48737ab..7b97fb7 100644
--- a/lib/pantallas/pantalla_ajustes.dart
+++ b/lib/pantallas/pantalla_ajustes.dart
@@ -14,6 +14,7 @@ import '../modelos/emisora.dart';
 import '../widgets/ecualizador_widget.dart';
 import '../widgets/pluri_glass_surface.dart';
 import '../widgets/pluri_icon.dart';
+import '../widgets/pluri_layout.dart';
 import '../widgets/pluri_premium_widgets.dart';
 
 class PantallaAjustes extends StatelessWidget {
@@ -22,7 +23,7 @@ class PantallaAjustes extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return ListView(
-      padding: const EdgeInsets.fromLTRB(0, 0, 0, 124),
+      padding: PluriLayout.pageListPadding,
       children: const [
         PluriScreenHeader(
           title: 'Ajustes',
@@ -35,7 +36,7 @@ class PantallaAjustes extends StatelessWidget {
           ),
         ),
         Padding(
-          padding: EdgeInsets.symmetric(horizontal: 16),
+          padding: PluriLayout.pageContentPadding,
           child: _AjustesContent(),
         ),
       ],
@@ -54,6 +55,8 @@ class _AjustesContent extends StatelessWidget {
         SizedBox(height: 12),
         _SeccionGrabaciones(),
         SizedBox(height: 12),
+        _SeccionTimerSueno(),
+        SizedBox(height: 12),
         _SeccionEmisoraPreferida(),
         SizedBox(height: 12),
         _SeccionEmisoras(),
@@ -158,6 +161,177 @@ class _SeccionGrabaciones extends StatelessWidget {
   }
 }
 
+class _SeccionTimerSueno extends StatelessWidget {
+  const _SeccionTimerSueno();
+
+  Future<void> _anadirPreset(BuildContext context) async {
+    final duracion = await showModalBottomSheet<Duration>(
+      context: context,
+      isScrollControlled: true,
+      showDragHandle: true,
+      builder: (_) => const _FormularioDuracionTimer(),
+    );
+    if (duracion == null || !context.mounted) return;
+    await context.read<EstadoRadio>().agregarTimerSuenoPreset(duracion);
+    if (!context.mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: Text(
+          'Acceso rápido añadido: ${_formatearDuracionTimer(duracion)}',
+        ),
+      ),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final estado = context.watch<EstadoRadio>();
+    final presets = estado.timerSuenoPresetsSegundos;
+    return PluriGlassSurface(
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Row(
+            children: [
+              const Icon(Icons.bedtime_rounded),
+              const SizedBox(width: 12),
+              Text(
+                'Timer de sueño',
+                style: Theme.of(context).textTheme.titleMedium,
+              ),
+              const Spacer(),
+              TextButton.icon(
+                icon: const Icon(Icons.add_rounded),
+                label: const Text('Añadir'),
+                onPressed: () => _anadirPreset(context),
+              ),
+            ],
+          ),
+          const SizedBox(height: 8),
+          Text(
+            'Personalizá los accesos rápidos que aparecen al apagar la radio automáticamente.',
+            style: Theme.of(context).textTheme.bodySmall,
+          ),
+          const SizedBox(height: 12),
+          Wrap(
+            spacing: 8,
+            runSpacing: 8,
+            children: [
+              for (final segundos in presets)
+                InputChip(
+                  label: Text(
+                    _formatearDuracionTimer(Duration(seconds: segundos)),
+                  ),
+                  onDeleted:
+                      presets.length <= 1
+                          ? null
+                          : () => context
+                              .read<EstadoRadio>()
+                              .eliminarTimerSuenoPreset(segundos),
+                ),
+            ],
+          ),
+          const SizedBox(height: 8),
+          Align(
+            alignment: Alignment.centerLeft,
+            child: TextButton.icon(
+              icon: const Icon(Icons.restore_rounded),
+              label: const Text('Restaurar tiempos recomendados'),
+              onPressed:
+                  () => context.read<EstadoRadio>().restaurarTimerSuenoPresets(),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _FormularioDuracionTimer extends StatefulWidget {
+  const _FormularioDuracionTimer();
+
+  @override
+  State<_FormularioDuracionTimer> createState() => _FormularioDuracionTimerState();
+}
+
+class _FormularioDuracionTimerState extends State<_FormularioDuracionTimer> {
+  final _horasCtrl = TextEditingController();
+  final _minutosCtrl = TextEditingController(text: '15');
+  final _segundosCtrl = TextEditingController();
+
+  @override
+  void dispose() {
+    _horasCtrl.dispose();
+    _minutosCtrl.dispose();
+    _segundosCtrl.dispose();
+    super.dispose();
+  }
+
+  int _leer(TextEditingController ctrl) => int.tryParse(ctrl.text.trim()) ?? 0;
+
+  void _guardar() {
+    final duracion = Duration(
+      hours: _leer(_horasCtrl),
+      minutes: _leer(_minutosCtrl),
+      seconds: _leer(_segundosCtrl),
+    );
+    if (duracion <= Duration.zero) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(content: Text('Elegí una duración mayor que cero.')),
+      );
+      return;
+    }
+    Navigator.pop(context, duracion);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final bottom = MediaQuery.viewInsetsOf(context).bottom;
+    return SafeArea(
+      child: Padding(
+        padding: EdgeInsets.fromLTRB(18, 0, 18, 18 + bottom),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Text(
+              'Nuevo acceso rápido',
+              style: Theme.of(context).textTheme.titleLarge,
+            ),
+            const SizedBox(height: 12),
+            Row(
+              children: [
+                Expanded(child: _campo(_horasCtrl, 'Horas')),
+                const SizedBox(width: 8),
+                Expanded(child: _campo(_minutosCtrl, 'Minutos')),
+                const SizedBox(width: 8),
+                Expanded(child: _campo(_segundosCtrl, 'Segundos')),
+              ],
+            ),
+            const SizedBox(height: 16),
+            FilledButton.icon(
+              icon: const Icon(Icons.save_rounded),
+              label: const Text('Guardar acceso rápido'),
+              onPressed: _guardar,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _campo(TextEditingController controller, String label) {
+    return TextField(
+      controller: controller,
+      keyboardType: TextInputType.number,
+      decoration: InputDecoration(
+        labelText: label,
+        border: const OutlineInputBorder(),
+      ),
+    );
+  }
+}
+
 class _SeccionEcualizador extends StatelessWidget {
   const _SeccionEcualizador();
 
@@ -463,7 +637,7 @@ class _FormularioEmisoraState extends State<_FormularioEmisora> {
   Widget build(BuildContext context) {
     final bottom = MediaQuery.of(context).viewInsets.bottom;
     return Padding(
-      padding: EdgeInsets.fromLTRB(16, 16, 16, 16 + bottom),
+      padding: EdgeInsets.fromLTRB(PluriLayout.horizontal, PluriLayout.horizontal, PluriLayout.horizontal, PluriLayout.horizontal + bottom),
       child: Form(
         key: _formKey,
         child: Column(
@@ -711,3 +885,16 @@ class _SeccionInfo extends StatelessWidget {
     );
   }
 }
+
+String _formatearDuracionTimer(Duration duracion) {
+  final horas = duracion.inHours;
+  final minutos = duracion.inMinutes.remainder(60);
+  final segundos = duracion.inSeconds.remainder(60);
+  if (horas > 0) {
+    return '${horas}h ${minutos.toString().padLeft(2, '0')}m ${segundos.toString().padLeft(2, '0')}s';
+  }
+  if (minutos > 0) {
+    return segundos == 0 ? '$minutos min' : '${minutos}m ${segundos}s';
+  }
+  return '$segundos s';
+}
diff --git a/lib/pantallas/pantalla_alarmas.dart b/lib/pantallas/pantalla_alarmas.dart
index 66abd67..460c601 100644
--- a/lib/pantallas/pantalla_alarmas.dart
+++ b/lib/pantallas/pantalla_alarmas.dart
@@ -7,6 +7,7 @@ import '../modelos/alarma_musical.dart';
 import '../modelos/emisora.dart';
 import '../widgets/pluri_glass_surface.dart';
 import '../widgets/pluri_icon.dart';
+import '../widgets/pluri_layout.dart';
 import '../widgets/pluri_premium_widgets.dart';
 
 class PantallaAlarmas extends StatelessWidget {
@@ -19,7 +20,7 @@ class PantallaAlarmas extends StatelessWidget {
     return RefreshIndicator(
       onRefresh: estado.refrescarProgramacion,
       child: ListView(
-        padding: const EdgeInsets.fromLTRB(0, 0, 0, 124),
+        padding: PluriLayout.pageListPadding,
         children: [
           PluriScreenHeader(
             title: 'Despertar musical',
@@ -34,7 +35,7 @@ class PantallaAlarmas extends StatelessWidget {
             ),
           ),
           Padding(
-            padding: const EdgeInsets.symmetric(horizontal: 16),
+            padding: PluriLayout.pageContentPadding,
             child: Column(
               children: [
                 _PanelProximaAlarma(estado: estado),
diff --git a/lib/pantallas/pantalla_buscar.dart b/lib/pantallas/pantalla_buscar.dart
index e061763..3855793 100644
--- a/lib/pantallas/pantalla_buscar.dart
+++ b/lib/pantallas/pantalla_buscar.dart
@@ -5,6 +5,7 @@ import 'package:provider/provider.dart';
 import '../estado/estado_radio.dart';
 import '../widgets/pluri_glass_surface.dart';
 import '../widgets/pluri_icon.dart';
+import '../widgets/pluri_layout.dart';
 import '../widgets/pluri_premium_widgets.dart';
 import 'package:pluriwave/widgets/tarjeta_emisora.dart';
 
@@ -68,7 +69,7 @@ class _PantallaBuscarState extends State<PantallaBuscar> {
     final theme = Theme.of(context);
 
     return ListView(
-      padding: const EdgeInsets.fromLTRB(0, 0, 0, 124),
+      padding: PluriLayout.pageListPadding,
       children: [
         PluriScreenHeader(
           title: 'Buscar senal',
@@ -80,7 +81,7 @@ class _PantallaBuscarState extends State<PantallaBuscar> {
           ),
         ),
         Padding(
-          padding: const EdgeInsets.fromLTRB(16, 10, 16, 0),
+          padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 10, PluriLayout.horizontal, 0),
           child: PluriGlassSurface(
             padding: const EdgeInsets.all(10),
             borderRadius: BorderRadius.circular(999),
@@ -135,7 +136,7 @@ class _PantallaBuscarState extends State<PantallaBuscar> {
     final theme = Theme.of(context);
     final pais = estado.paisCercanoDetectado;
     return Padding(
-      padding: const EdgeInsets.fromLTRB(16, 8, 16, 0),
+      padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 8, PluriLayout.horizontal, 0),
       child: PluriGlassSurface(
         padding: const EdgeInsets.all(12),
         child: Column(
@@ -209,7 +210,7 @@ class _PantallaBuscarState extends State<PantallaBuscar> {
   ) {
     final theme = Theme.of(context);
     return Padding(
-      padding: const EdgeInsets.fromLTRB(16, 8, 16, 0),
+      padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 8, PluriLayout.horizontal, 0),
       child: PluriGlassSurface(
         padding: const EdgeInsets.all(10),
         child: Column(
@@ -277,7 +278,7 @@ class _PantallaBuscarState extends State<PantallaBuscar> {
     return ListView.separated(
       shrinkWrap: true,
       physics: const NeverScrollableScrollPhysics(),
-      padding: const EdgeInsets.fromLTRB(16, 16, 16, 16),
+      padding: const EdgeInsets.all(PluriLayout.horizontal),
       itemCount: total,
       separatorBuilder: (_, __) => const SizedBox(height: 10),
       itemBuilder: (context, i) {
diff --git a/lib/pantallas/pantalla_favoritos.dart b/lib/pantallas/pantalla_favoritos.dart
index 7c605e9..bbaf9d0 100644
--- a/lib/pantallas/pantalla_favoritos.dart
+++ b/lib/pantallas/pantalla_favoritos.dart
@@ -4,6 +4,7 @@ import 'package:provider/provider.dart';
 import '../estado/estado_radio.dart';
 import '../widgets/pluri_glass_surface.dart';
 import '../widgets/pluri_icon.dart';
+import '../widgets/pluri_layout.dart';
 import '../widgets/pluri_premium_widgets.dart';
 import 'package:pluriwave/widgets/tarjeta_emisora.dart';
 
@@ -19,7 +20,7 @@ class PantallaFavoritos extends StatelessWidget {
 
     if (favoritos.isEmpty) {
       return ListView(
-        padding: EdgeInsets.fromLTRB(0, 0, 0, 124),
+        padding: PluriLayout.pageListPadding,
         children: [
           PluriScreenHeader(
             title: 'Favoritos',
@@ -56,7 +57,7 @@ class PantallaFavoritos extends StatelessWidget {
           ),
         ),
         SliverPadding(
-          padding: const EdgeInsets.fromLTRB(12, 4, 12, 124),
+          padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 4, PluriLayout.horizontal, PluriLayout.bottomChromeInset),
           sliver: SliverReorderableList(
             proxyDecorator: (child, index, animation) => ScaleTransition(
               scale: Tween<double>(begin: 1, end: 1.03).animate(animation),
diff --git a/lib/pantallas/pantalla_inicio.dart b/lib/pantallas/pantalla_inicio.dart
index 1b738a2..b0f403b 100644
--- a/lib/pantallas/pantalla_inicio.dart
+++ b/lib/pantallas/pantalla_inicio.dart
@@ -4,9 +4,9 @@ import 'package:provider/provider.dart';
 import 'package:shimmer/shimmer.dart' as shimmer;
 
 import '../estado/estado_radio.dart';
-import '../tema/pluriwave_theme.dart';
 import '../widgets/pluri_glass_surface.dart';
 import '../widgets/pluri_icon.dart';
+import '../widgets/pluri_layout.dart';
 import '../widgets/pluri_premium_widgets.dart';
 import 'package:pluriwave/widgets/tarjeta_emisora.dart';
 
@@ -41,7 +41,6 @@ class _PantallaInicioState extends State<PantallaInicio> {
   Widget build(BuildContext context) {
     final estado = context.watch<EstadoRadio>();
     final theme = Theme.of(context);
-    final t = context.pluriTokens;
 
     return RefreshIndicator(
       onRefresh: estado.cargarPopulares,
@@ -54,7 +53,7 @@ class _PantallaInicioState extends State<PantallaInicio> {
           if (estado.error != null)
             SliverToBoxAdapter(child: _errorBanner(estado, theme)),
           SliverPadding(
-            padding: EdgeInsets.fromLTRB(t.spacingMd, 0, t.spacingMd, 124),
+            padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 0, PluriLayout.horizontal, PluriLayout.bottomChromeInset),
             sliver: _gridEmisoras(estado),
           ),
         ],
@@ -90,7 +89,7 @@ class _PantallaInicioState extends State<PantallaInicio> {
   Widget _seccionCercanas(EstadoRadio estado, ThemeData theme) {
     final pais = estado.paisCercanoDetectado;
     return Padding(
-      padding: const EdgeInsets.fromLTRB(16, 8, 16, 0),
+      padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 8, PluriLayout.horizontal, 0),
       child: PluriGlassSurface(
         padding: const EdgeInsets.all(12),
         child: Column(
@@ -158,7 +157,7 @@ class _PantallaInicioState extends State<PantallaInicio> {
 
   Widget _seccionTendencias(EstadoRadio estado, ThemeData theme) {
     return Padding(
-      padding: const EdgeInsets.fromLTRB(16, 8, 16, 0),
+      padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 8, PluriLayout.horizontal, 0),
       child: PluriGlassSurface(
         padding: const EdgeInsets.all(12),
         child: Column(
@@ -202,7 +201,7 @@ class _PantallaInicioState extends State<PantallaInicio> {
 
   Widget _chipGeneros(BuildContext context, ThemeData theme) {
     return Padding(
-      padding: const EdgeInsets.fromLTRB(16, 16, 16, 8),
+      padding: const EdgeInsets.fromLTRB(PluriLayout.horizontal, 16, PluriLayout.horizontal, 8),
       child: PluriGlassSurface(
         padding: const EdgeInsets.all(12),
         child: Column(
@@ -287,7 +286,7 @@ class _PantallaInicioState extends State<PantallaInicio> {
         child: PluriEmptyState(
           glyph: PluriIconGlyph.home,
           title: 'No hay emisoras disponibles',
-          subtitle: 'Proba refrescar o elegir otro g?nero para volver a capturar se?al.',
+          subtitle: 'Proba refrescar o elegir otro género para volver a capturar señal.',
         ),
       );
     }
diff --git a/lib/servicios/servicio_timer.dart b/lib/servicios/servicio_timer.dart
index 20892ba..ba0ecb8 100644
--- a/lib/servicios/servicio_timer.dart
+++ b/lib/servicios/servicio_timer.dart
@@ -1,7 +1,20 @@
 import 'dart:async';
 import 'servicio_audio.dart';
 
-/// Opciones predefinidas de timer en minutos.
+/// Opciones predefinidas de timer en segundos.
+const opcionesTimerSegundos = [
+  180,
+  300,
+  600,
+  900,
+  1800,
+  3600,
+  5400,
+  7200,
+  10800,
+];
+
+/// Compatibilidad con el reproductor completo, que aún muestra minutos.
 const opcionesTimer = [3, 5, 10, 15, 30, 60, 90, 120, 180];
 
 /// Servicio de auto-apagado de la radio.
@@ -34,8 +47,13 @@ class ServicioTimer {
 
   /// Inicia el timer para [minutos] minutos.
   void iniciar(int minutos) {
+    iniciarDuracion(Duration(minutes: minutos));
+  }
+
+  /// Inicia el timer para una duración exacta.
+  void iniciarDuracion(Duration duracion) {
+    if (duracion <= Duration.zero) return;
     unawaited(cancelar());
-    final duracion = Duration(minutes: minutos);
     _finAt = DateTime.now().add(duracion);
     _tiempoRestante = duracion;
     _activo = true;
diff --git a/lib/widgets/pluri_bottom_navigation.dart b/lib/widgets/pluri_bottom_navigation.dart
new file mode 100644
index 0000000..5c7bb6c
--- /dev/null
+++ b/lib/widgets/pluri_bottom_navigation.dart
@@ -0,0 +1,148 @@
+import 'package:flutter/material.dart';
+
+import '../tema/pluriwave_theme.dart';
+import 'pluri_glass_surface.dart';
+import 'pluri_icon.dart';
+
+class PluriNavItem {
+  const PluriNavItem({required this.glyph, required this.label});
+
+  final PluriIconGlyph glyph;
+  final String label;
+}
+
+class PluriBottomNavigation extends StatelessWidget {
+  const PluriBottomNavigation({
+    super.key,
+    required this.items,
+    required this.selectedIndex,
+    required this.onSelected,
+  });
+
+  final List<PluriNavItem> items;
+  final int selectedIndex;
+  final ValueChanged<int> onSelected;
+
+  @override
+  Widget build(BuildContext context) {
+    final t = context.pluriTokens;
+    return PluriGlassSurface(
+      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 7),
+      borderRadius: BorderRadius.circular(999),
+      glowColor: t.glowColor.withValues(alpha: 0.28),
+      child: Row(
+        children: [
+          for (var i = 0; i < items.length; i++)
+            Expanded(
+              flex: i == selectedIndex ? 15 : 10,
+              child: _PluriNavButton(
+                item: items[i],
+                selected: i == selectedIndex,
+                onTap: () => onSelected(i),
+              ),
+            ),
+        ],
+      ),
+    );
+  }
+}
+
+class _PluriNavButton extends StatelessWidget {
+  const _PluriNavButton({
+    required this.item,
+    required this.selected,
+    required this.onTap,
+  });
+
+  final PluriNavItem item;
+  final bool selected;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    final t = context.pluriTokens;
+    final foreground = Theme.of(context).colorScheme.onSurface;
+    return Semantics(
+      button: true,
+      selected: selected,
+      label: item.label,
+      child: AnimatedContainer(
+        duration: context.pluriMotion.normal,
+        curve: Curves.easeOutCubic,
+        margin: EdgeInsets.symmetric(horizontal: selected ? 3 : 2),
+        decoration: BoxDecoration(
+          borderRadius: BorderRadius.circular(999),
+          gradient: selected
+              ? LinearGradient(
+                  colors: [
+                    t.electricMagenta.withValues(alpha: 0.32),
+                    t.warmCoral.withValues(alpha: 0.18),
+                  ],
+                )
+              : null,
+          border: Border.all(
+            color: selected
+                ? Colors.white.withValues(alpha: 0.22)
+                : Colors.white.withValues(alpha: 0.06),
+          ),
+          boxShadow: selected
+              ? [
+                  BoxShadow(
+                    color: t.glowColor.withValues(alpha: 0.36),
+                    blurRadius: 24,
+                    spreadRadius: -6,
+                    offset: const Offset(0, 8),
+                  ),
+                ]
+              : const [],
+        ),
+        child: InkWell(
+          borderRadius: BorderRadius.circular(999),
+          onTap: onTap,
+          child: Padding(
+            padding: EdgeInsets.symmetric(
+              horizontal: selected ? 8 : 3,
+              vertical: selected ? 8 : 7,
+            ),
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                AnimatedScale(
+                  scale: selected ? 1.16 : 0.96,
+                  duration: context.pluriMotion.quick,
+                  curve: Curves.easeOutBack,
+                  child: PluriIcon(
+                    glyph: item.glyph,
+                    variant: selected
+                        ? PluriIconVariant.activeGlow
+                        : PluriIconVariant.filled,
+                    size: selected ? 42 : 34,
+                  ),
+                ),
+                AnimatedSize(
+                  duration: context.pluriMotion.quick,
+                  curve: Curves.easeOutCubic,
+                  child: selected
+                      ? Padding(
+                          padding: const EdgeInsets.only(top: 2),
+                          child: Text(
+                            item.label,
+                            maxLines: 1,
+                            overflow: TextOverflow.ellipsis,
+                            style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                                  color: foreground,
+                                  fontWeight: FontWeight.w900,
+                                  letterSpacing: -0.2,
+                                ),
+                          ),
+                        )
+                      : const SizedBox.shrink(),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
diff --git a/lib/widgets/pluri_layout.dart b/lib/widgets/pluri_layout.dart
new file mode 100644
index 0000000..1723035
--- /dev/null
+++ b/lib/widgets/pluri_layout.dart
@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+
+import '../tema/pluriwave_theme.dart';
+
+abstract final class PluriLayout {
+  static const double horizontal = 16;
+  static const double sectionGap = 12;
+  static const double panelGap = 12;
+  static const double compactGap = 8;
+  static const double bottomChromeInset = 146;
+
+  static const EdgeInsets pageListPadding = EdgeInsets.fromLTRB(
+    0,
+    0,
+    0,
+    bottomChromeInset,
+  );
+
+  static const EdgeInsets pageContentPadding = EdgeInsets.symmetric(
+    horizontal: horizontal,
+  );
+
+  static const EdgeInsets sheetPadding = EdgeInsets.all(18);
+}
+
+class PluriPanelColumn extends StatelessWidget {
+  const PluriPanelColumn({super.key, required this.children, this.gap});
+
+  final List<Widget> children;
+  final double? gap;
+
+  @override
+  Widget build(BuildContext context) {
+    final resolvedGap = gap ?? context.pluriTokens.spacingSm + 4;
+    return Column(
+      children: [
+        for (var i = 0; i < children.length; i++) ...[
+          if (i > 0) SizedBox(height: resolvedGap),
+          children[i],
+        ],
+      ],
+    );
+  }
+}