lib/providers/settings_controller.dart

@@ -37,7 +37,7 @@ class SettingsController extends ChangeNotifier {
   final Future<SharedPreferences> _prefsFuture =
       SharedPreferences.getInstance();
 
-  Color _seedColor = AppTheme.defaultNextcloudBlue;
+  Color _seedColor = AppTheme.defaultAccent;
   ThemeMode _themeMode = ThemeMode.system;
   bool _useDynamicColor = true;
   bool _amoledDark = false;

lib/theme/app_theme.dart

@@ -5,6 +5,15 @@ import 'design_tokens.dart';
 class AppTheme {
   static const Color defaultNextcloudBlue = Color(0xFF0082C9);
 
+  /// The design system's own fixed violet - [NooColors.light]/`.dark`'s
+  /// `accent`, and the accent picker's "Default" swatch. Also
+  /// [SettingsController]'s initial [SettingsController.seedColor], so a
+  /// fresh install (or any device without Material You dynamic color) keeps
+  /// today's violet look rather than picking up the leftover
+  /// [defaultNextcloudBlue] default from before seed colors actually did
+  /// anything to the Noo-styled UI (see [NooColors.fromSeed]).
+  static const Color defaultAccent = Color(0xFF8D0DE3);
+
   // Flutter's Material 3 default (ZoomPageTransitionsBuilder) doesn't
   // implement Android's predictive-back gesture at all. Opting into
   // PredictiveBackPageTransitionsBuilder here (Android only) is required —
@@ -24,6 +33,7 @@ class AppTheme {
   static const _sliderTheme = SliderThemeData(year2023: false);
 
   static const List<Color> seedColors = [
+    defaultAccent, // Default (Noo Violet)
     Color(0xFF0082C9), // Nextcloud Blue
     Color(0xFF009688), // Ocean Teal
     Color(0xFF6750A4), // Deep Purple
@@ -87,7 +97,7 @@ class AppTheme {
           );
     final nooColors = (useDynamicColor && dynamicScheme != null)
         ? NooColors.fromDynamicScheme(dynamicScheme)
-        : NooColors.light;
+        : NooColors.fromSeed(seedColor, Brightness.light);
 
     return ThemeData(
       useMaterial3: true,
@@ -131,7 +141,7 @@ class AppTheme {
           );
     var nooColors = (useDynamicColor && dynamicScheme != null)
         ? NooColors.fromDynamicScheme(dynamicScheme)
-        : NooColors.dark;
+        : NooColors.fromSeed(seedColor, Brightness.dark);
 
     if (amoled) {
       // True OLED black across every surface tone Material 3 hands out -

lib/theme/design_tokens.dart

@@ -7,13 +7,13 @@ import 'package:google_fonts/google_fonts.dart';
 /// `Theme.of(context).extension<NooColors>()!` (or a `context.nooColors`
 /// getter, once one exists) instead of the Material [ColorScheme] roles.
 ///
-/// Two independent sources feed this, matching the app's color settings:
-/// the fixed [light]/[dark] palettes below (the design system's own
-/// default look), or [NooColors.fromDynamicScheme] when the user has
-/// Material You dynamic color turned on - there's no third option (no
-/// custom accent picker), since the design system explicitly rules out
-/// "add new colors". [withAmoled] layers on top of either source when the
-/// user's AMOLED toggle is on.
+/// Three sources feed this, matching the app's color settings: the fixed
+/// [light]/[dark] palettes below (the design system's own default look,
+/// also what the accent picker's "Default" violet swatch selects),
+/// [NooColors.fromDynamicScheme] when the user has Material You dynamic
+/// color turned on, or [NooColors.fromSeed] for a custom accent-picker
+/// swatch. [withAmoled] layers on top of any of the three when the user's
+/// AMOLED toggle is on.
 @immutable
 class NooColors extends ThemeExtension<NooColors> {
   final Color bg;
@@ -161,6 +161,34 @@ class NooColors extends ThemeExtension<NooColors> {
     );
   }
 
+  /// Derives an accent-only variant of the fixed [light]/[dark] palette for
+  /// a user-chosen custom seed color (Settings' accent-color picker) -
+  /// unlike [fromDynamicScheme], only the accent roles change; bg/surface/
+  /// fg etc. stay the Noo warm-neutral palette, since picking a named
+  /// accent ("Ocean Teal") is meant to retint the brand color, not reshape
+  /// the whole surface to match a wallpaper the way dynamic color does.
+  /// [seedColor] equal to the fixed palette's own accent (the picker's
+  /// "Default" violet swatch) returns the untouched fixed palette, so the
+  /// out-of-box look stays pixel-identical rather than going through
+  /// [ColorScheme.fromSeed]'s tonal-palette math for no reason.
+  factory NooColors.fromSeed(Color seedColor, Brightness brightness) {
+    final fixed = brightness == Brightness.dark ? dark : light;
+    if (seedColor == light.accent) return fixed;
+    final cs = ColorScheme.fromSeed(
+      seedColor: seedColor,
+      brightness: brightness,
+    );
+    return fixed.copyWith(
+      accent: seedColor,
+      // Light accentText matches accent exactly, same as the fixed
+      // palette - dark needs a lighter, desaturated tint for contrast
+      // against a dark surface, which is exactly what Material's tonal
+      // primary (tone ~80 in dark mode) is designed to give.
+      accentText: brightness == Brightness.dark ? cs.primary : seedColor,
+      accentSoft: cs.primaryContainer,
+    );
+  }
+
   /// True OLED black across every surface tone - not just [bg] - so cards,
   /// bars and sheets all go black too instead of the dark palette's warm
   /// dark-grey tones. Mirrors the AMOLED handling this replaces in
@@ -391,10 +419,8 @@ class NooText {
     fontWeight: FontWeight.w400,
   );
 
-  static TextStyle get label => GoogleFonts.instrumentSans(
-    fontSize: 13,
-    fontWeight: FontWeight.w600,
-  );
+  static TextStyle get label =>
+      GoogleFonts.instrumentSans(fontSize: 13, fontWeight: FontWeight.w600);
 
   static TextStyle get meta => GoogleFonts.instrumentSans(
     fontSize: 13,

lib/widgets/settings/settings_appearance.dart

@@ -28,12 +28,13 @@ String _seekBarStyleLabel(MediaProgressBarStyle style) {
 
 /// Settings section 6: appearance. Only the theme mode (System/Light/Dark)
 /// is in the design system's own recipe - the accent-color picker, dynamic
-/// color, AMOLED and the video seek-bar style are all settings that predate
-/// the design system and have no place in it (a single fixed accent, no
-/// per-user color choice). They still work, just demoted into a separate
-/// "Advanced appearance" group beneath the main card per the rebuild brief,
-/// rather than dropped - see the handoff report for whether to remove them
-/// outright.
+/// color, AMOLED and the video seek-bar style predate the design system, so
+/// they're demoted into a separate "Advanced appearance" group beneath the
+/// main card rather than folded into it. The accent picker itself picks a
+/// [NooColors] variant (see [NooColors.fromSeed]/[NooColors.fromDynamicScheme]):
+/// "Default" is the fixed violet palette, the named swatches retint just
+/// the accent roles, and "Match wallpaper" (the `wallpaper`-icon swatch)
+/// follows Material You dynamic color instead.
 class SettingsAppearanceSection extends StatelessWidget {
   const SettingsAppearanceSection({super.key});
 
@@ -55,9 +56,21 @@ class SettingsAppearanceSection extends StatelessWidget {
                 value: settings.themeMode,
                 onChanged: settings.setThemeMode,
                 options: const [
-                  NooSegmentOption(value: ThemeMode.system, icon: LucideIcons.monitor, label: 'System'),
-                  NooSegmentOption(value: ThemeMode.light, icon: LucideIcons.sun, label: 'Light'),
-                  NooSegmentOption(value: ThemeMode.dark, icon: LucideIcons.moon, label: 'Dark'),
+                  NooSegmentOption(
+                    value: ThemeMode.system,
+                    icon: LucideIcons.monitor,
+                    label: 'System',
+                  ),
+                  NooSegmentOption(
+                    value: ThemeMode.light,
+                    icon: LucideIcons.sun,
+                    label: 'Light',
+                  ),
+                  NooSegmentOption(
+                    value: ThemeMode.dark,
+                    icon: LucideIcons.moon,
+                    label: 'Dark',
+                  ),
                 ],
               ),
             ),
@@ -70,20 +83,33 @@ class SettingsAppearanceSection extends StatelessWidget {
             NooSettingsRow(
               icon: LucideIcons.palette,
               label: const Text('Accent color'),
-              subtitle: Text(settings.useDynamicColor ? 'Matching your wallpaper' : 'Custom color'),
-              trailing: _AccentSwatchDot(color: settings.useDynamicColor ? null : settings.seedColor),
+              subtitle: Text(
+                settings.useDynamicColor
+                    ? 'Matching your wallpaper'
+                    : settings.seedColor == AppTheme.defaultAccent
+                    ? 'Default'
+                    : 'Custom color',
+              ),
+              trailing: _AccentSwatchDot(
+                color: settings.useDynamicColor ? null : settings.seedColor,
+              ),
               onTap: () => _openAccentPicker(context, settings),
             ),
             NooSettingsRow(
               icon: LucideIcons.sparkles,
               label: const Text('AMOLED black'),
               subtitle: const Text('Use pure black backgrounds in dark mode'),
-              trailing: NooToggle(checked: settings.amoledDark, onChanged: settings.setAmoledDark),
+              trailing: NooToggle(
+                checked: settings.amoledDark,
+                onChanged: settings.setAmoledDark,
+              ),
             ),
             NooSettingsRow(
               icon: LucideIcons.waves,
               label: const Text('Seek bar style'),
-              subtitle: const Text('The progress bar style used when playing videos'),
+              subtitle: const Text(
+                'The progress bar style used when playing videos',
+              ),
               value: _seekBarStyleLabel(settings.mediaProgressBarStyle),
               onTap: () => _openSeekBarPicker(context, settings),
             ),
@@ -112,7 +138,9 @@ class _AccentSwatchDot extends StatelessWidget {
         color: color ?? colors.surface3,
         shape: BoxShape.circle,
       ),
-      child: color == null ? Icon(LucideIcons.wallpaper, size: 12, color: colors.fg2) : null,
+      child: color == null
+          ? Icon(LucideIcons.wallpaper, size: 12, color: colors.fg2)
+          : null,
     );
   }
 }
@@ -219,7 +247,11 @@ class _SeekBarStyleOption extends StatelessWidget {
   final bool isSelected;
   final VoidCallback onTap;
 
-  const _SeekBarStyleOption({required this.style, required this.isSelected, required this.onTap});
+  const _SeekBarStyleOption({
+    required this.style,
+    required this.isSelected,
+    required this.onTap,
+  });
 
   @override
   Widget build(BuildContext context) {

test/widgets/noo/core_test.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:lucide_icons_flutter/lucide_icons.dart';
+import 'package:noo/theme/app_theme.dart';
 import 'package:noo/theme/design_tokens.dart';
 import 'package:noo/widgets/noo/core/noo_avatar.dart';
 import 'package:noo/widgets/noo/core/noo_badge.dart';
@@ -17,6 +18,45 @@ import 'noo_test_utils.dart';
 void main() {
   setUpNooTests();
 
+  group('NooColors.fromSeed', () {
+    test('the default accent returns the untouched fixed palette', () {
+      expect(
+        identical(
+          NooColors.fromSeed(AppTheme.defaultAccent, Brightness.light),
+          NooColors.light,
+        ),
+        isTrue,
+      );
+      expect(
+        identical(
+          NooColors.fromSeed(AppTheme.defaultAccent, Brightness.dark),
+          NooColors.dark,
+        ),
+        isTrue,
+      );
+    });
+
+    test('a custom seed retints only the accent roles', () {
+      const seed = Color(0xFF009688); // Ocean Teal
+      final light = NooColors.fromSeed(seed, Brightness.light);
+      expect(light.accent, seed);
+      expect(light.accentText, seed);
+      expect(light.accentSoft, isNot(NooColors.light.accentSoft));
+      // The rest of the palette is untouched - a named accent choice
+      // retints the brand color, it doesn't reshape the surface.
+      expect(light.bg, NooColors.light.bg);
+      expect(light.surface, NooColors.light.surface);
+      expect(light.fg1, NooColors.light.fg1);
+
+      final dark = NooColors.fromSeed(seed, Brightness.dark);
+      expect(dark.accent, seed);
+      // Dark accentText is a lighter/desaturated tint for contrast, not
+      // the raw seed itself.
+      expect(dark.accentText, isNot(seed));
+      expect(dark.bg, NooColors.dark.bg);
+    });
+  });
+
   group('NooAvatar', () {
     testNooWidgets('current user uses accent-soft/accent-text', (
       tester,

test/widgets/noo/noo_test_utils.dart

@@ -15,10 +15,13 @@ void setUpNooTests() {
 /// Themes built through the real [AppTheme] (non-dynamic), so the
 /// [NooColors] extension is registered exactly as in the app. Built lazily
 /// inside test bodies - AppTheme touches Google Fonts, which needs the test
-/// binding to exist first.
+/// binding to exist first. Seeded with [AppTheme.defaultAccent] (not just
+/// any color) so component tests exercise the exact fixed [NooColors.light]/
+/// `.dark` palette their color assertions are written against, rather than
+/// a [NooColors.fromSeed] retint - see its doc comment.
 ThemeData nooTheme(Brightness brightness) => brightness == Brightness.light
-    ? AppTheme.light(AppTheme.defaultNextcloudBlue, useDynamicColor: false)
-    : AppTheme.dark(AppTheme.defaultNextcloudBlue, useDynamicColor: false);
+    ? AppTheme.light(AppTheme.defaultAccent, useDynamicColor: false)
+    : AppTheme.dark(AppTheme.defaultAccent, useDynamicColor: false);
 
 Future<void> pumpNoo(
   WidgetTester tester,
@@ -43,7 +46,8 @@ Future<void> pumpNoo(
 /// Runs [body] once per theme, each as its own named test.
 void testNooWidgets(
   String description,
-  Future<void> Function(WidgetTester tester, ThemeData theme, NooColors colors) body,
+  Future<void> Function(WidgetTester tester, ThemeData theme, NooColors colors)
+  body,
 ) {
   for (final brightness in Brightness.values) {
     testWidgets('$description (${brightness.name})', (tester) async {
@@ -59,7 +63,10 @@ BoxDecoration decorationOf(WidgetTester tester, Finder finder) {
   final boxes = find.ancestor(
     of: finder,
     matching: find.byWidgetPredicate(
-      (w) => w is DecoratedBox && w.decoration is BoxDecoration && (w.decoration as BoxDecoration).color != null,
+      (w) =>
+          w is DecoratedBox &&
+          w.decoration is BoxDecoration &&
+          (w.decoration as BoxDecoration).color != null,
     ),
     matchRoot: true,
   );