diff --git a/docs/deploy-checklist.md b/docs/deploy-checklist.md
index cc6f22c..9f18e73 100644
--- a/docs/deploy-checklist.md
+++ b/docs/deploy-checklist.md
@@ -37,8 +37,8 @@ Phase 1 **A~C** 이후 실행 트랙. 작업 단위를 하나씩 처리한다.
 
 - 앱 코드는 클로즈드 베타 직전 수준
 - **`https://msn.iykyka.com` 라이브 + N3 완료 + Gemini 실초안 OK + Track A/B 완료**
-- 진행 중: **N4 FCM 코드 경로** → Master 시크릿 대기 → Android UI QA
-- 실 FCM 전송·Android 실기기 탭 · 사람 PoC 실행은 남음
+- UI: **Quiet Ink** (틸 액센트 · 라이트/다크) 전면 적용 중 — FCM 실기기는 잠시 후순위
+- 실 FCM 기기 수신 · Android 실기기 탭 · 사람 PoC 실행은 남음
 
 ### NEXT 순서
 
diff --git a/mobile/lib/screens/chat_screen.dart b/mobile/lib/screens/chat_screen.dart
index 02f418b..741f730 100644
--- a/mobile/lib/screens/chat_screen.dart
+++ b/mobile/lib/screens/chat_screen.dart
@@ -258,7 +258,7 @@ class _ChatScreenState extends State<ChatScreen> {
         margin: const EdgeInsets.fromLTRB(12, 0, 12, 8),
         padding: const EdgeInsets.all(16),
         decoration: BoxDecoration(
-          color: theme.colorScheme.errorContainer.withOpacity(0.85),
+          color: theme.colorScheme.errorContainer.withValues(alpha: 0.92),
           borderRadius: BorderRadius.circular(16),
           border: Border.all(color: AppTheme.glassBorder(theme.brightness)),
         ),
@@ -302,7 +302,7 @@ class _ChatScreenState extends State<ChatScreen> {
       margin: const EdgeInsets.fromLTRB(12, 0, 12, 8),
       padding: const EdgeInsets.all(16),
       decoration: BoxDecoration(
-        color: theme.colorScheme.secondaryContainer.withOpacity(0.85),
+        color: theme.colorScheme.secondaryContainer.withValues(alpha: 0.95),
         borderRadius: BorderRadius.circular(16),
         border: Border.all(color: AppTheme.glassBorder(theme.brightness)),
       ),
diff --git a/mobile/lib/screens/conversation_list_screen.dart b/mobile/lib/screens/conversation_list_screen.dart
index ba3f3e1..b7ee348 100644
--- a/mobile/lib/screens/conversation_list_screen.dart
+++ b/mobile/lib/screens/conversation_list_screen.dart
@@ -155,14 +155,18 @@ class _ConversationListScreenState extends State<ConversationListScreen> {
   }
 
   Color _avatarColor(BuildContext context, int seed) {
-    final scheme = Theme.of(context).colorScheme;
-    final palette = [scheme.primaryContainer, scheme.tertiaryContainer, scheme.secondaryContainer];
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    final palette = isDark
+        ? const [Color(0xFF1F3A37), Color(0xFF2A3140), Color(0xFF3A3224)]
+        : const [Color(0xFFD9F3F0), Color(0xFFE8E6E1), Color(0xFFFFE8C8)];
     return palette[seed % palette.length];
   }
 
   Color _onAvatarColor(BuildContext context, int seed) {
-    final scheme = Theme.of(context).colorScheme;
-    final palette = [scheme.onPrimaryContainer, scheme.onTertiaryContainer, scheme.onSecondaryContainer];
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    final palette = isDark
+        ? const [Color(0xFF2DD4BF), Color(0xFFF2F1EF), Color(0xFFFBBF24)]
+        : const [Color(0xFF0F766E), Color(0xFF1C1B1A), Color(0xFFB45309)];
     return palette[seed % palette.length];
   }
 
@@ -251,26 +255,19 @@ class _ConversationListScreenState extends State<ConversationListScreen> {
                     ),
                   if (_rooms.isEmpty)
                     Padding(
-                      padding: const EdgeInsets.fromLTRB(32, 48, 32, 32),
+                      padding: const EdgeInsets.fromLTRB(32, 56, 32, 32),
                       child: Column(
                         children: [
                           Container(
-                            width: 72,
-                            height: 72,
+                            width: 68,
+                            height: 68,
                             decoration: BoxDecoration(
                               shape: BoxShape.circle,
-                              gradient: AppTheme.brandGradient,
-                              boxShadow: [
-                                BoxShadow(
-                                  color: const Color(0xFF6D5BD0).withValues(alpha: 0.3),
-                                  blurRadius: 24,
-                                  offset: const Offset(0, 10),
-                                ),
-                              ],
+                              color: theme.colorScheme.primaryContainer,
                             ),
-                            child: const Icon(Icons.chat_bubble_outline, size: 30, color: Colors.white),
+                            child: Icon(Icons.chat_bubble_outline, size: 28, color: theme.colorScheme.primary),
                           ),
-                          const SizedBox(height: 16),
+                          const SizedBox(height: 18),
                           Text('대화방이 없습니다', style: theme.textTheme.titleMedium),
                           const SizedBox(height: 8),
                           Text(
@@ -280,10 +277,10 @@ class _ConversationListScreenState extends State<ConversationListScreen> {
                             textAlign: TextAlign.center,
                             style: theme.textTheme.bodySmall?.copyWith(
                               color: theme.colorScheme.onSurfaceVariant,
-                              height: 1.45,
+                              height: 1.5,
                             ),
                           ),
-                          const SizedBox(height: 16),
+                          const SizedBox(height: 18),
                           FilledButton.tonalIcon(
                             onPressed: () async {
                               await Navigator.of(context).push(
@@ -299,49 +296,73 @@ class _ConversationListScreenState extends State<ConversationListScreen> {
                     ),
                   for (final room in _rooms)
                     Padding(
-                      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
-                      child: ListTile(
-                        leading: CircleAvatar(
-                          backgroundColor: _avatarColor(context, room.id),
-                          child: Icon(
-                            room.isGroup ? Icons.groups_outlined : Icons.person_outline,
-                            color: _onAvatarColor(context, room.id),
-                          ),
-                        ),
-                        title: Text(
-                          _titleFor(room, me),
-                          style: theme.textTheme.titleSmall,
-                        ),
-                        subtitle: Row(
-                          children: [
-                            if (room.twinDisabledByPeer) ...[
-                              Icon(Icons.block, size: 13, color: theme.colorScheme.error),
-                              const SizedBox(width: 4),
-                            ],
-                            Expanded(
-                              child: Text(
-                                _subtitleFor(room, me),
-                                style: theme.textTheme.bodySmall?.copyWith(
-                                  color: room.twinDisabledByPeer
-                                      ? theme.colorScheme.error
-                                      : theme.colorScheme.onSurfaceVariant,
+                      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 3),
+                      child: Material(
+                        color: AppTheme.glassFill(theme.brightness),
+                        borderRadius: BorderRadius.circular(16),
+                        child: InkWell(
+                          borderRadius: BorderRadius.circular(16),
+                          onTap: () async {
+                            await Navigator.of(context).push(
+                              MaterialPageRoute(
+                                builder: (_) => ChatScreen(
+                                  conversationId: room.id,
+                                  title: _titleFor(room, me),
                                 ),
                               ),
+                            );
+                            await _load();
+                          },
+                          child: Padding(
+                            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 12),
+                            child: Row(
+                              children: [
+                                CircleAvatar(
+                                  radius: 24,
+                                  backgroundColor: _avatarColor(context, room.id),
+                                  child: Icon(
+                                    room.isGroup ? Icons.groups_outlined : Icons.person_outline,
+                                    color: _onAvatarColor(context, room.id),
+                                  ),
+                                ),
+                                const SizedBox(width: 12),
+                                Expanded(
+                                  child: Column(
+                                    crossAxisAlignment: CrossAxisAlignment.start,
+                                    children: [
+                                      Text(
+                                        _titleFor(room, me),
+                                        style: theme.textTheme.titleSmall?.copyWith(fontWeight: FontWeight.w700),
+                                      ),
+                                      const SizedBox(height: 3),
+                                      Row(
+                                        children: [
+                                          if (room.twinDisabledByPeer) ...[
+                                            Icon(Icons.block, size: 13, color: theme.colorScheme.error),
+                                            const SizedBox(width: 4),
+                                          ],
+                                          Expanded(
+                                            child: Text(
+                                              _subtitleFor(room, me),
+                                              maxLines: 1,
+                                              overflow: TextOverflow.ellipsis,
+                                              style: theme.textTheme.bodySmall?.copyWith(
+                                                color: room.twinDisabledByPeer
+                                                    ? theme.colorScheme.error
+                                                    : theme.colorScheme.onSurfaceVariant,
+                                              ),
+                                            ),
+                                          ),
+                                        ],
+                                      ),
+                                    ],
+                                  ),
+                                ),
+                                Icon(Icons.chevron_right, size: 20, color: theme.colorScheme.onSurfaceVariant),
+                              ],
                             ),
-                          ],
+                          ),
                         ),
-                        trailing: const Icon(Icons.chevron_right, size: 20),
-                        onTap: () async {
-                          await Navigator.of(context).push(
-                            MaterialPageRoute(
-                              builder: (_) => ChatScreen(
-                                conversationId: room.id,
-                                title: _titleFor(room, me),
-                              ),
-                            ),
-                          );
-                          await _load();
-                        },
                       ),
                     ),
                   const SizedBox(height: 72),
diff --git a/mobile/lib/screens/onboarding_tone_screen.dart b/mobile/lib/screens/onboarding_tone_screen.dart
index 92ff912..78ae32b 100644
--- a/mobile/lib/screens/onboarding_tone_screen.dart
+++ b/mobile/lib/screens/onboarding_tone_screen.dart
@@ -2,7 +2,6 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 import '../state/session_state.dart';
-import '../theme/app_theme.dart';
 import '../widgets/primary_gradient_button.dart';
 
 /// Phase 1 onboarding skeleton: capture a few style samples locally.
@@ -70,13 +69,10 @@ class _OnboardingToneScreenState extends State<OnboardingToneScreen> {
                 width: 56,
                 height: 56,
                 decoration: BoxDecoration(
-                  gradient: AppTheme.brandGradient,
-                  borderRadius: BorderRadius.circular(18),
-                  boxShadow: [
-                    BoxShadow(color: const Color(0xFF6D5BD0).withValues(alpha: 0.3), blurRadius: 18, offset: const Offset(0, 8)),
-                  ],
+                  color: scheme.primary,
+                  borderRadius: BorderRadius.circular(16),
                 ),
-                child: const Icon(Icons.record_voice_over_outlined, size: 28, color: Colors.white),
+                child: Icon(Icons.record_voice_over_outlined, size: 28, color: scheme.onPrimary),
               ),
             ),
             const SizedBox(height: 16),
diff --git a/mobile/lib/screens/signup_screen.dart b/mobile/lib/screens/signup_screen.dart
index 879c289..7f517dd 100644
--- a/mobile/lib/screens/signup_screen.dart
+++ b/mobile/lib/screens/signup_screen.dart
@@ -143,9 +143,6 @@ class _DemoTestPanel extends StatelessWidget {
             color: AppTheme.glassFill(brightness),
             borderRadius: BorderRadius.circular(16),
             border: Border.all(color: AppTheme.glassBorder(brightness)),
-            boxShadow: [
-              BoxShadow(color: AppTheme.glassShadow(brightness), blurRadius: 20, offset: const Offset(0, 8)),
-            ],
           ),
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
@@ -154,7 +151,7 @@ class _DemoTestPanel extends StatelessWidget {
                 '테스트용 (누구나)',
                 style: theme.textTheme.labelLarge?.copyWith(
                   color: theme.colorScheme.primary,
-                  letterSpacing: 0.4,
+                  letterSpacing: 0.2,
                 ),
               ),
               const SizedBox(height: 6),
diff --git a/mobile/lib/theme/app_theme.dart b/mobile/lib/theme/app_theme.dart
index aeeac39..7aca83d 100644
--- a/mobile/lib/theme/app_theme.dart
+++ b/mobile/lib/theme/app_theme.dart
@@ -1,95 +1,133 @@
 import 'package:flutter/material.dart';
+import 'package:google_fonts/google_fonts.dart';
 
-/// Central design tokens for 와카뷰 (Ykavu) — "aurora glass" direction.
-/// `backgroundGradient` + the glow orbs in [GradientBackdrop] paint behind
-/// every screen (wired into `MaterialApp.builder`); cards/inputs/app bars
-/// are semi-transparent "glass" surfaces with a soft colored shadow so they
-/// visibly lift off that background. `twinAccent` stays a separate warm
-/// accent so a twin-written bubble never reads as something the human
-/// actually typed (PRD §3.1 와카뷰 뱃지).
+/// Quiet Ink — calm messenger direction for 와카뷰.
+/// Light: warm off-white canvas, charcoal ink, single deep-teal accent.
+/// Dark: charcoal surfaces, same teal (brighter), twin stays warm amber.
+/// Avoids aurora/purple glass so chat reads as a daily messenger, not a demo.
 class AppTheme {
   AppTheme._();
 
-  static const _seed = Color(0xFF6D5BD0);
+  // Light
+  static const canvasLight = Color(0xFFF7F6F3);
+  static const surfaceLight = Color(0xFFFFFFFF);
+  static const inkLight = Color(0xFF1C1B1A);
+  static const mutedLight = Color(0xFF6B6864);
+  static const lineLight = Color(0xFFE8E6E1);
+  static const teal = Color(0xFF0F766E);
+  static const tealSoft = Color(0xFFD9F3F0);
+  static const twinAmberLight = Color(0xFFB45309);
 
-  /// Brand gradient used for the wordmark, brand mark and primary CTAs.
+  // Dark
+  static const canvasDark = Color(0xFF0E0F12);
+  static const surfaceDark = Color(0xFF1A1C22);
+  static const inkDark = Color(0xFFF2F1EF);
+  static const mutedDark = Color(0xFF9B9893);
+  static const lineDark = Color(0xFF2A2D36);
+  static const tealBright = Color(0xFF2DD4BF);
+  static const tealSoftDark = Color(0xFF143D3A);
+  static const twinAmberDark = Color(0xFFFBBF24);
+
+  /// Kept for call sites that still reference a "brand" fill — solid teal, not a rainbow.
   static const brandGradient = LinearGradient(
     begin: Alignment.centerLeft,
     end: Alignment.centerRight,
-    colors: [Color(0xFF6D5BD0), Color(0xFFA855C9), Color(0xFFE0609A)],
+    colors: [teal, Color(0xFF0D9488)],
   );
 
   static Color twinAccent(Brightness brightness) =>
-      brightness == Brightness.dark ? Colors.amber.shade300 : Colors.amber.shade800;
+      brightness == Brightness.dark ? twinAmberDark : twinAmberLight;
 
-  /// Diagonal aurora gradient painted behind every screen. Light: violet →
-  /// sky → pink, more saturated than a "safe" pastel so it reads as
-  /// intentional branding rather than a default Material backdrop. Dark:
-  /// deep indigo → navy → plum. Paired with the blurred glow orbs in
-  /// [GradientBackdrop].
+  /// Soft near-flat wash (not aurora). Used by [GradientBackdrop].
   static LinearGradient backgroundGradient(Brightness brightness) {
     if (brightness == Brightness.dark) {
       return const LinearGradient(
-        begin: Alignment.topLeft,
-        end: Alignment.bottomRight,
-        colors: [Color(0xFF201A3D), Color(0xFF16213E), Color(0xFF351C3C)],
+        begin: Alignment.topCenter,
+        end: Alignment.bottomCenter,
+        colors: [Color(0xFF12141A), canvasDark],
       );
     }
     return const LinearGradient(
-      begin: Alignment.topLeft,
-      end: Alignment.bottomRight,
-      colors: [Color(0xFFDCCBFF), Color(0xFFC3E4FF), Color(0xFFFFC9E8)],
+      begin: Alignment.topCenter,
+      end: Alignment.bottomCenter,
+      colors: [Color(0xFFF3F2EE), canvasLight],
     );
   }
 
-  /// Soft blurred accent blobs layered over [backgroundGradient] by
-  /// [GradientBackdrop] for depth ("aurora glow").
-  static Color glowPrimary(Brightness brightness) => brightness == Brightness.dark
-      ? const Color(0xFF8B7CF6).withValues(alpha: 0.35)
-      : const Color(0xFFB79CFF).withValues(alpha: 0.55);
+  static Color glowPrimary(Brightness brightness) =>
+      (brightness == Brightness.dark ? tealBright : teal).withValues(alpha: 0.06);
 
-  static Color glowSecondary(Brightness brightness) => brightness == Brightness.dark
-      ? const Color(0xFFE879C4).withValues(alpha: 0.25)
-      : const Color(0xFFFFA9DC).withValues(alpha: 0.50);
+  static Color glowSecondary(Brightness brightness) => Colors.transparent;
 
-  /// "Glass" fill for cards/panels — semi-transparent so the gradient
-  /// behind still reads through, with a bright border for the classic
-  /// glassmorphism edge highlight and a tinted shadow so the surface
-  /// visibly lifts off the backdrop instead of blending into it.
-  static Color glassFill(Brightness brightness) => brightness == Brightness.dark
-      ? Colors.white.withValues(alpha: 0.08)
-      : Colors.white.withValues(alpha: 0.72);
+  /// Panel fill (replaces glassmorphism).
+  static Color glassFill(Brightness brightness) =>
+      brightness == Brightness.dark ? surfaceDark : surfaceLight;
 
-  static Color glassBorder(Brightness brightness) => brightness == Brightness.dark
-      ? Colors.white.withValues(alpha: 0.16)
-      : Colors.white.withValues(alpha: 0.85);
+  static Color glassBorder(Brightness brightness) =>
+      brightness == Brightness.dark ? lineDark : lineLight;
 
-  static Color glassShadow(Brightness brightness) => brightness == Brightness.dark
-      ? Colors.black.withValues(alpha: 0.45)
-      : const Color(0xFF6D5BD0).withValues(alpha: 0.18);
+  static Color glassShadow(Brightness brightness) =>
+      brightness == Brightness.dark ? Colors.black.withValues(alpha: 0.35) : const Color(0xFF1C1B1A).withValues(alpha: 0.06);
+
+  static Color mineBubble(Brightness brightness) =>
+      brightness == Brightness.dark ? tealSoftDark : teal;
+
+  static Color mineBubbleFg(Brightness brightness) =>
+      brightness == Brightness.dark ? inkDark : Colors.white;
+
+  static Color peerBubble(Brightness brightness) =>
+      brightness == Brightness.dark ? const Color(0xFF24272F) : const Color(0xFFEFEEEA);
 
   static ThemeData light() => _build(Brightness.light);
   static ThemeData dark() => _build(Brightness.dark);
 
   static ThemeData _build(Brightness brightness) {
-    final scheme = ColorScheme.fromSeed(seedColor: _seed, brightness: brightness);
-    final glass = glassFill(brightness);
-    final glassEdge = glassBorder(brightness);
-    final glassShadowColor = glassShadow(brightness);
-    final glassShape = RoundedRectangleBorder(
-      borderRadius: BorderRadius.circular(18),
-      side: BorderSide(color: glassEdge, width: 1),
+    final isDark = brightness == Brightness.dark;
+    final primary = isDark ? tealBright : teal;
+    final onPrimary = isDark ? canvasDark : Colors.white;
+    final scheme = ColorScheme(
+      brightness: brightness,
+      primary: primary,
+      onPrimary: onPrimary,
+      primaryContainer: isDark ? tealSoftDark : tealSoft,
+      onPrimaryContainer: isDark ? tealBright : const Color(0xFF0A4F4A),
+      secondary: isDark ? twinAmberDark : twinAmberLight,
+      onSecondary: isDark ? canvasDark : Colors.white,
+      secondaryContainer: isDark ? const Color(0xFF3D2E14) : const Color(0xFFFFE8C8),
+      onSecondaryContainer: isDark ? twinAmberDark : twinAmberLight,
+      tertiary: primary,
+      onTertiary: onPrimary,
+      error: isDark ? const Color(0xFFF87171) : const Color(0xFFB91C1C),
+      onError: Colors.white,
+      surface: isDark ? surfaceDark : surfaceLight,
+      onSurface: isDark ? inkDark : inkLight,
+      onSurfaceVariant: isDark ? mutedDark : mutedLight,
+      outline: isDark ? lineDark : lineLight,
+      outlineVariant: isDark ? lineDark : lineLight,
+      surfaceContainerHighest: isDark ? const Color(0xFF24272F) : const Color(0xFFEFEEEA),
+      surfaceContainerHigh: isDark ? const Color(0xFF20232A) : const Color(0xFFF3F2EE),
+      surfaceContainer: isDark ? surfaceDark : surfaceLight,
+    );
+
+    final baseText = GoogleFonts.plusJakartaSansTextTheme();
+    final textTheme = _textTheme(baseText, scheme.onSurface);
+
+    final panel = glassFill(brightness);
+    final edge = glassBorder(brightness);
+    final shadow = glassShadow(brightness);
+    final shape = RoundedRectangleBorder(
+      borderRadius: BorderRadius.circular(16),
+      side: BorderSide(color: edge),
     );
 
     return ThemeData(
       useMaterial3: true,
       brightness: brightness,
       colorScheme: scheme,
-      // Transparent so the gradient painted by MaterialApp.builder shows
-      // through behind every Scaffold.
       scaffoldBackgroundColor: Colors.transparent,
-      visualDensity: VisualDensity.comfortable,
-      textTheme: _textTheme(),
+      visualDensity: VisualDensity.standard,
+      textTheme: textTheme,
+      primaryTextTheme: textTheme,
       appBarTheme: AppBarTheme(
         backgroundColor: Colors.transparent,
         foregroundColor: scheme.onSurface,
@@ -97,127 +135,128 @@ class AppTheme {
         elevation: 0,
         scrolledUnderElevation: 0,
         centerTitle: false,
-        titleTextStyle: TextStyle(
-          fontSize: 20,
-          fontWeight: FontWeight.w800,
-          color: scheme.onSurface,
-          letterSpacing: -0.2,
-        ),
+        titleTextStyle: textTheme.titleLarge?.copyWith(fontWeight: FontWeight.w700, letterSpacing: -0.3),
       ),
       cardTheme: CardThemeData(
-        elevation: 8,
-        shadowColor: glassShadowColor,
-        color: glass,
-        shape: glassShape,
+        elevation: 0,
+        shadowColor: shadow,
+        color: panel,
+        shape: shape,
         margin: EdgeInsets.zero,
       ),
       listTileTheme: ListTileThemeData(
         iconColor: scheme.onSurfaceVariant,
         shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
-        contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
+        contentPadding: const EdgeInsets.symmetric(horizontal: 14, vertical: 4),
+        minVerticalPadding: 10,
       ),
-      dividerTheme: DividerThemeData(color: scheme.outlineVariant, space: 32, thickness: 1),
+      dividerTheme: DividerThemeData(color: edge, space: 1, thickness: 1),
       inputDecorationTheme: InputDecorationTheme(
         filled: true,
-        fillColor: glass,
+        fillColor: isDark ? const Color(0xFF14161C) : const Color(0xFFF0EFEC),
         contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
         border: OutlineInputBorder(
           borderRadius: BorderRadius.circular(14),
-          borderSide: BorderSide(color: glassEdge, width: 1),
+          borderSide: BorderSide(color: edge),
         ),
         enabledBorder: OutlineInputBorder(
           borderRadius: BorderRadius.circular(14),
-          borderSide: BorderSide(color: glassEdge, width: 1),
+          borderSide: BorderSide(color: edge),
         ),
         focusedBorder: OutlineInputBorder(
           borderRadius: BorderRadius.circular(14),
-          borderSide: BorderSide(color: scheme.primary, width: 1.6),
+          borderSide: BorderSide(color: primary, width: 1.5),
         ),
         errorBorder: OutlineInputBorder(
           borderRadius: BorderRadius.circular(14),
-          borderSide: BorderSide(color: scheme.error, width: 1.2),
+          borderSide: BorderSide(color: scheme.error),
         ),
         focusedErrorBorder: OutlineInputBorder(
           borderRadius: BorderRadius.circular(14),
-          borderSide: BorderSide(color: scheme.error, width: 1.6),
+          borderSide: BorderSide(color: scheme.error, width: 1.5),
         ),
-        hintStyle: TextStyle(color: scheme.onSurfaceVariant.withValues(alpha: 0.7)),
+        hintStyle: TextStyle(color: scheme.onSurfaceVariant.withValues(alpha: 0.75)),
       ),
       filledButtonTheme: FilledButtonThemeData(
         style: FilledButton.styleFrom(
+          backgroundColor: primary,
+          foregroundColor: onPrimary,
           padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 14),
           shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
           textStyle: const TextStyle(fontWeight: FontWeight.w700),
+          elevation: 0,
         ),
       ),
       outlinedButtonTheme: OutlinedButtonThemeData(
         style: OutlinedButton.styleFrom(
+          foregroundColor: scheme.onSurface,
           padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 14),
           shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
+          side: BorderSide(color: edge),
         ),
       ),
       textButtonTheme: TextButtonThemeData(
         style: TextButton.styleFrom(
+          foregroundColor: primary,
           shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
         ),
       ),
       iconButtonTheme: IconButtonThemeData(
         style: IconButton.styleFrom(
+          foregroundColor: scheme.onSurfaceVariant,
           shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
         ),
       ),
-      segmentedButtonTheme: SegmentedButtonThemeData(
-        style: SegmentedButton.styleFrom(
-          backgroundColor: glass,
-          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
-          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
-        ),
-      ),
       chipTheme: ChipThemeData(
-        shape: RoundedRectangleBorder(
-          borderRadius: BorderRadius.circular(10),
-          side: BorderSide(color: glassEdge, width: 1),
-        ),
-        side: BorderSide.none,
-        backgroundColor: glass,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(10)),
+        side: BorderSide(color: edge),
+        backgroundColor: panel,
         labelStyle: TextStyle(color: scheme.onSurfaceVariant, fontWeight: FontWeight.w600, fontSize: 12),
         padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
       ),
       floatingActionButtonTheme: FloatingActionButtonThemeData(
-        backgroundColor: scheme.primary,
-        foregroundColor: scheme.onPrimary,
-        elevation: 4,
-        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(18)),
+        backgroundColor: primary,
+        foregroundColor: onPrimary,
+        elevation: 2,
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
       ),
       snackBarTheme: SnackBarThemeData(
         behavior: SnackBarBehavior.floating,
+        backgroundColor: isDark ? surfaceDark : inkLight,
+        contentTextStyle: TextStyle(color: isDark ? inkDark : Colors.white),
         shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
       ),
-      bannerTheme: MaterialBannerThemeData(
-        backgroundColor: glass,
-        padding: const EdgeInsets.all(16),
-      ),
       dialogTheme: DialogThemeData(
-        backgroundColor: brightness == Brightness.dark
-            ? const Color(0xFF211D3D)
-            : Colors.white.withValues(alpha: 0.95),
+        backgroundColor: panel,
         shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(20)),
       ),
-      progressIndicatorTheme: ProgressIndicatorThemeData(color: scheme.primary),
+      progressIndicatorTheme: ProgressIndicatorThemeData(color: primary),
+      bannerTheme: MaterialBannerThemeData(backgroundColor: panel, padding: const EdgeInsets.all(16)),
     );
   }
 
-  static TextTheme _textTheme() {
-    return const TextTheme(
-      displayLarge: TextStyle(fontWeight: FontWeight.w800, letterSpacing: -1.2),
-      displaySmall: TextStyle(fontWeight: FontWeight.w800, letterSpacing: -0.5),
-      headlineSmall: TextStyle(fontWeight: FontWeight.w800, letterSpacing: -0.3),
-      titleLarge: TextStyle(fontWeight: FontWeight.w700),
-      titleMedium: TextStyle(fontWeight: FontWeight.w700),
-      titleSmall: TextStyle(fontWeight: FontWeight.w700),
-      bodyLarge: TextStyle(height: 1.4),
-      bodyMedium: TextStyle(height: 1.4),
-      labelLarge: TextStyle(fontWeight: FontWeight.w700),
+  static TextTheme _textTheme(TextTheme base, Color ink) {
+    TextStyle s(TextStyle? t, {FontWeight? w, double? size, double? ls, double? h}) =>
+        (t ?? const TextStyle()).copyWith(
+          color: ink,
+          fontWeight: w,
+          fontSize: size,
+          letterSpacing: ls,
+          height: h,
+        );
+
+    return base.copyWith(
+      displayLarge: s(base.displayLarge, w: FontWeight.w700, size: 40, ls: -1.2),
+      displaySmall: s(base.displaySmall, w: FontWeight.w700, size: 32, ls: -0.8),
+      headlineSmall: s(base.headlineSmall, w: FontWeight.w700, size: 22, ls: -0.3),
+      titleLarge: s(base.titleLarge, w: FontWeight.w700, size: 18, ls: -0.2),
+      titleMedium: s(base.titleMedium, w: FontWeight.w600, size: 16),
+      titleSmall: s(base.titleSmall, w: FontWeight.w600, size: 14),
+      bodyLarge: s(base.bodyLarge, w: FontWeight.w400, size: 16, h: 1.45),
+      bodyMedium: s(base.bodyMedium, w: FontWeight.w400, size: 14, h: 1.45),
+      bodySmall: s(base.bodySmall, w: FontWeight.w400, size: 12, h: 1.4),
+      labelLarge: s(base.labelLarge, w: FontWeight.w600, size: 14),
+      labelSmall: s(base.labelSmall, w: FontWeight.w600, size: 11, ls: 0.1),
     );
   }
 }
diff --git a/mobile/lib/widgets/brand_mark.dart b/mobile/lib/widgets/brand_mark.dart
index 2d726ba..786f97d 100644
--- a/mobile/lib/widgets/brand_mark.dart
+++ b/mobile/lib/widgets/brand_mark.dart
@@ -2,10 +2,7 @@ import 'package:flutter/material.dart';
 
 import '../theme/app_theme.dart';
 
-/// The 와카뷰 app icon mark: a gradient-filled rounded badge with a bold
-/// "Y" monogram and a soft brand-tinted shadow, used wherever the splash /
-/// signup / onboarding screens need a small brand anchor instead of a
-/// generic Material icon.
+/// Quiet Ink brand mark — solid teal tile with a "Y" monogram.
 class BrandMark extends StatelessWidget {
   const BrandMark({super.key, this.size = 64});
 
@@ -13,18 +10,21 @@ class BrandMark extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final radius = size * 0.32;
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    final fill = isDark ? AppTheme.tealBright : AppTheme.teal;
+    final fg = isDark ? AppTheme.canvasDark : Colors.white;
+    final radius = size * 0.28;
     return Container(
       width: size,
       height: size,
       decoration: BoxDecoration(
+        color: fill,
         borderRadius: BorderRadius.circular(radius),
-        gradient: AppTheme.brandGradient,
         boxShadow: [
           BoxShadow(
-            color: const Color(0xFF6D5BD0).withValues(alpha: 0.38),
-            blurRadius: size * 0.35,
-            offset: Offset(0, size * 0.12),
+            color: AppTheme.teal.withValues(alpha: isDark ? 0.25 : 0.18),
+            blurRadius: size * 0.22,
+            offset: Offset(0, size * 0.08),
           ),
         ],
       ),
@@ -32,10 +32,11 @@ class BrandMark extends StatelessWidget {
       child: Text(
         'Y',
         style: TextStyle(
-          color: Colors.white,
-          fontWeight: FontWeight.w900,
-          fontSize: size * 0.46,
+          color: fg,
+          fontWeight: FontWeight.w800,
+          fontSize: size * 0.44,
           height: 1,
+          letterSpacing: -0.5,
         ),
       ),
     );
diff --git a/mobile/lib/widgets/gradient_backdrop.dart b/mobile/lib/widgets/gradient_backdrop.dart
index 0d8cce2..d9cb8ed 100644
--- a/mobile/lib/widgets/gradient_backdrop.dart
+++ b/mobile/lib/widgets/gradient_backdrop.dart
@@ -1,14 +1,8 @@
-import 'dart:ui';
-
 import 'package:flutter/material.dart';
 
 import '../theme/app_theme.dart';
 
-/// Paints the app-wide aurora gradient + soft blurred glow orbs behind
-/// [child]. Wired into `MaterialApp.builder` so every screen gets it
-/// automatically without each Scaffold needing its own background —
-/// screens just need a transparent `scaffoldBackgroundColor` (set globally
-/// in [AppTheme]).
+/// Quiet canvas behind every screen — near-flat wash, no aurora orbs.
 class GradientBackdrop extends StatelessWidget {
   const GradientBackdrop({super.key, required this.child});
 
@@ -17,43 +11,9 @@ class GradientBackdrop extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final brightness = Theme.of(context).brightness;
-    return Stack(
-      fit: StackFit.expand,
-      children: [
-        DecoratedBox(decoration: BoxDecoration(gradient: AppTheme.backgroundGradient(brightness))),
-        Positioned(
-          top: -90,
-          right: -70,
-          child: _Glow(color: AppTheme.glowPrimary(brightness), size: 260),
-        ),
-        Positioned(
-          bottom: -110,
-          left: -90,
-          child: _Glow(color: AppTheme.glowSecondary(brightness), size: 320),
-        ),
-        if (child != null) child!,
-      ],
-    );
-  }
-}
-
-class _Glow extends StatelessWidget {
-  const _Glow({required this.color, required this.size});
-
-  final Color color;
-  final double size;
-
-  @override
-  Widget build(BuildContext context) {
-    return IgnorePointer(
-      child: ImageFiltered(
-        imageFilter: ImageFilter.blur(sigmaX: 60, sigmaY: 60),
-        child: Container(
-          width: size,
-          height: size,
-          decoration: BoxDecoration(shape: BoxShape.circle, color: color),
-        ),
-      ),
+    return DecoratedBox(
+      decoration: BoxDecoration(gradient: AppTheme.backgroundGradient(brightness)),
+      child: child,
     );
   }
 }
diff --git a/mobile/lib/widgets/gradient_text.dart b/mobile/lib/widgets/gradient_text.dart
index 568773f..a21da74 100644
--- a/mobile/lib/widgets/gradient_text.dart
+++ b/mobile/lib/widgets/gradient_text.dart
@@ -2,9 +2,7 @@ import 'package:flutter/material.dart';
 
 import '../theme/app_theme.dart';
 
-/// Renders [text] filled with [AppTheme.brandGradient] instead of a flat
-/// color — used for the "와카뷰" wordmark so the brand reads as designed
-/// rather than default black-on-gradient body text.
+/// Brand wordmark — ink (not rainbow gradient) so Quiet Ink stays calm.
 class GradientText extends StatelessWidget {
   const GradientText(this.text, {super.key, this.style, this.textAlign});
 
@@ -14,10 +12,11 @@ class GradientText extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return ShaderMask(
-      blendMode: BlendMode.srcIn,
-      shaderCallback: (bounds) => AppTheme.brandGradient.createShader(Rect.fromLTWH(0, 0, bounds.width, bounds.height)),
-      child: Text(text, style: style, textAlign: textAlign),
+    final ink = Theme.of(context).brightness == Brightness.dark ? AppTheme.inkDark : AppTheme.inkLight;
+    return Text(
+      text,
+      textAlign: textAlign,
+      style: (style ?? const TextStyle()).copyWith(color: ink, fontWeight: FontWeight.w800),
     );
   }
 }
diff --git a/mobile/lib/widgets/message_bubble.dart b/mobile/lib/widgets/message_bubble.dart
index b888e5f..3bbd422 100644
--- a/mobile/lib/widgets/message_bubble.dart
+++ b/mobile/lib/widgets/message_bubble.dart
@@ -3,8 +3,7 @@ import 'package:flutter/material.dart';
 import '../models/models.dart';
 import '../theme/app_theme.dart';
 
-/// Twin messages get a dashed border + badge (PRD §3.1 와카뷰 뱃지) so an
-/// auto-sent bubble never reads as something the human actually typed.
+/// Twin messages get a dashed border + badge (PRD §3.1 와카뷰 뱃지).
 class MessageBubble extends StatelessWidget {
   const MessageBubble({
     super.key,
@@ -31,6 +30,7 @@ class MessageBubble extends StatelessWidget {
     final twin = message.isTwin;
     final retracted = message.retracted;
     final accent = AppTheme.twinAccent(theme.brightness);
+    final brightness = theme.brightness;
 
     final Color bg;
     final Color fg;
@@ -38,18 +38,18 @@ class MessageBubble extends StatelessWidget {
       bg = scheme.surfaceContainerHigh;
       fg = scheme.onSurfaceVariant;
     } else if (isMine) {
-      bg = scheme.primaryContainer;
-      fg = scheme.onPrimaryContainer;
+      bg = AppTheme.mineBubble(brightness);
+      fg = AppTheme.mineBubbleFg(brightness);
     } else {
-      bg = scheme.surfaceContainerHighest;
+      bg = AppTheme.peerBubble(brightness);
       fg = scheme.onSurface;
     }
 
     final radius = BorderRadius.only(
       topLeft: const Radius.circular(18),
       topRight: const Radius.circular(18),
-      bottomLeft: Radius.circular(isMine ? 18 : 4),
-      bottomRight: Radius.circular(isMine ? 4 : 18),
+      bottomLeft: Radius.circular(isMine ? 18 : 5),
+      bottomRight: Radius.circular(isMine ? 5 : 18),
     );
 
     final bubble = Container(
@@ -94,12 +94,12 @@ class MessageBubble extends StatelessWidget {
           else
             Text(
               message.text,
-              style: theme.textTheme.bodyMedium?.copyWith(color: fg, height: 1.35),
+              style: theme.textTheme.bodyMedium?.copyWith(color: fg, height: 1.4),
             ),
           const SizedBox(height: 4),
           Text(
             _time(message.createdAt),
-            style: theme.textTheme.labelSmall?.copyWith(color: fg.withOpacity(0.55), fontSize: 10),
+            style: theme.textTheme.labelSmall?.copyWith(color: fg.withValues(alpha: 0.55), fontSize: 10),
           ),
         ],
       ),
@@ -135,7 +135,7 @@ class MessageBubble extends StatelessWidget {
     );
 
     return Padding(
-      padding: const EdgeInsets.symmetric(vertical: 4, horizontal: 12),
+      padding: const EdgeInsets.symmetric(vertical: 3, horizontal: 12),
       child: Align(
         alignment: isMine ? Alignment.centerRight : Alignment.centerLeft,
         child: content,
@@ -155,11 +155,10 @@ class _DashedRRectPainter extends CustomPainter {
     final paint = Paint()
       ..color = color
       ..style = PaintingStyle.stroke
-      ..strokeWidth = 1.4;
+      ..strokeWidth = 1.2;
     final rrect = radius.toRRect(Rect.fromLTWH(0.7, 0.7, size.width - 1.4, size.height - 1.4));
     final path = Path()..addRRect(rrect);
-    final dashed = _dashPath(path, dashLength: 5, gapLength: 4);
-    canvas.drawPath(dashed, paint);
+    canvas.drawPath(_dashPath(path, dashLength: 5, gapLength: 4), paint);
   }
 
   Path _dashPath(Path source, {required double dashLength, required double gapLength}) {
diff --git a/mobile/lib/widgets/my_user_id_chip.dart b/mobile/lib/widgets/my_user_id_chip.dart
index aa602d6..a635b31 100644
--- a/mobile/lib/widgets/my_user_id_chip.dart
+++ b/mobile/lib/widgets/my_user_id_chip.dart
@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
+import '../theme/app_theme.dart';
+
 /// Shows the signed-in numeric user id with one-tap copy.
 class MyUserIdChip extends StatelessWidget {
   const MyUserIdChip({super.key, required this.userId, this.compact = false});
@@ -29,18 +31,23 @@ class MyUserIdChip extends StatelessWidget {
         icon: const Icon(Icons.badge_outlined),
       );
     }
+    final brightness = theme.brightness;
     return Material(
-      color: theme.colorScheme.surfaceContainerHighest.withValues(alpha: 0.7),
-      borderRadius: BorderRadius.circular(12),
+      color: AppTheme.glassFill(brightness),
+      borderRadius: BorderRadius.circular(14),
       child: InkWell(
-        borderRadius: BorderRadius.circular(12),
+        borderRadius: BorderRadius.circular(14),
         onTap: () => _copy(context),
-        child: Padding(
-          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
+        child: Container(
+          padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 12),
+          decoration: BoxDecoration(
+            borderRadius: BorderRadius.circular(14),
+            border: Border.all(color: AppTheme.glassBorder(brightness)),
+          ),
           child: Row(
             children: [
               Icon(Icons.badge_outlined, size: 18, color: theme.colorScheme.primary),
-              const SizedBox(width: 8),
+              const SizedBox(width: 10),
               Expanded(
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
@@ -55,16 +62,17 @@ class MyUserIdChip extends StatelessWidget {
                       '$userId',
                       style: theme.textTheme.titleMedium?.copyWith(
                         fontWeight: FontWeight.w700,
-                        letterSpacing: 0.5,
+                        letterSpacing: 0.4,
                       ),
                     ),
                   ],
                 ),
               ),
               Text(
-                '탭하여 복사',
+                '복사',
                 style: theme.textTheme.labelSmall?.copyWith(
                   color: theme.colorScheme.primary,
+                  fontWeight: FontWeight.w700,
                 ),
               ),
               const SizedBox(width: 4),
diff --git a/mobile/lib/widgets/primary_gradient_button.dart b/mobile/lib/widgets/primary_gradient_button.dart
index b808778..fc72997 100644
--- a/mobile/lib/widgets/primary_gradient_button.dart
+++ b/mobile/lib/widgets/primary_gradient_button.dart
@@ -2,10 +2,7 @@ import 'package:flutter/material.dart';
 
 import '../theme/app_theme.dart';
 
-/// Primary call-to-action button filled with [AppTheme.brandGradient] and a
-/// soft brand-tinted shadow, so the one action per screen that matters most
-/// (시작하기 / 이 말투로 시작 …) visibly outranks the flat glass buttons
-/// around it.
+/// Primary CTA — solid teal (API name kept for existing call sites).
 class PrimaryGradientButton extends StatelessWidget {
   const PrimaryGradientButton({
     super.key,
@@ -20,41 +17,29 @@ class PrimaryGradientButton extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final disabled = onPressed == null;
-    return Opacity(
-      opacity: disabled ? 0.6 : 1,
-      child: Material(
-        color: Colors.transparent,
-        borderRadius: BorderRadius.circular(16),
-        child: InkWell(
-          borderRadius: BorderRadius.circular(16),
-          onTap: onPressed,
-          child: Container(
-            height: 52,
-            alignment: Alignment.center,
-            decoration: BoxDecoration(
-              borderRadius: BorderRadius.circular(16),
-              gradient: AppTheme.brandGradient,
-              boxShadow: [
-                BoxShadow(
-                  color: const Color(0xFF6D5BD0).withValues(alpha: 0.35),
-                  blurRadius: 20,
-                  offset: const Offset(0, 8),
-                ),
-              ],
-            ),
-            child: loading
-                ? const SizedBox(
-                    height: 20,
-                    width: 20,
-                    child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white),
-                  )
-                : Text(
-                    label,
-                    style: const TextStyle(color: Colors.white, fontWeight: FontWeight.w700, fontSize: 16),
-                  ),
-          ),
+    final isDark = Theme.of(context).brightness == Brightness.dark;
+    final bg = isDark ? AppTheme.tealBright : AppTheme.teal;
+    final fg = isDark ? AppTheme.canvasDark : Colors.white;
+    final disabled = onPressed == null || loading;
+    return SizedBox(
+      height: 52,
+      width: double.infinity,
+      child: FilledButton(
+        onPressed: disabled && !loading ? null : onPressed,
+        style: FilledButton.styleFrom(
+          backgroundColor: bg,
+          foregroundColor: fg,
+          disabledBackgroundColor: bg.withValues(alpha: 0.4),
+          shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
+          elevation: 0,
         ),
+        child: loading
+            ? SizedBox(
+                height: 20,
+                width: 20,
+                child: CircularProgressIndicator(strokeWidth: 2, color: fg),
+              )
+            : Text(label, style: TextStyle(color: fg, fontWeight: FontWeight.w700, fontSize: 16)),
       ),
     );
   }