diff --git a/integration_test/windows_662_shot_test.dart b/integration_test/windows_662_shot_test.dart
index 080f16e..5781cf7 100644
--- a/integration_test/windows_662_shot_test.dart
+++ b/integration_test/windows_662_shot_test.dart
@@ -21,6 +21,8 @@ import 'package:path/path.dart' as p;
 /// 설정은 메모리에만 (저장하지 않음), 즐겨찾기는 시험 폴더 (JJ_SHOT_TMP).
 void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  // ⑦ 밝은 화면 캡처: JJ_SHOT_THEME=light (JJ_SHOT_DIR 를 따로 두어 어두운 것과 견줌)
+  if (Platform.environment['JJ_SHOT_THEME'] == 'light') JjColors.use(Brightness.light);
   final out = Platform.environment['JJ_SHOT_DIR'] ?? p.join(Directory.systemTemp.path, 'jj_shots_662');
   final key = GlobalKey();
 
diff --git a/integration_test/windows_check_shot_test.dart b/integration_test/windows_check_shot_test.dart
index a16fca4..ffde860 100644
--- a/integration_test/windows_check_shot_test.dart
+++ b/integration_test/windows_check_shot_test.dart
@@ -27,6 +27,8 @@ import 'support/temp_dir.dart';
 /// 시험 폴더 · 메모리 저장소만 쓴다 (사용자 설정 · 비밀번호는 건드리지 않음). 휴지통에 넣은 시험 항목은 끝에 $I 로 골라 지운다.
 void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  // ⑦ 밝은 화면 캡처: JJ_SHOT_THEME=light (JJ_SHOT_DIR 를 따로 두어 어두운 것과 견줌)
+  if (Platform.environment['JJ_SHOT_THEME'] == 'light') JjColors.use(Brightness.light);
   final out = Platform.environment['JJ_SHOT_DIR'] ?? p.join(Directory.systemTemp.path, 'jj_shots');
   // 시험 폴더: 항목이 아주 많은 시스템 임시 폴더 대신 (JJ_SHOT_TMP, 없으면 시스템 임시 폴더)
   Directory tempDir(String prefix) {
diff --git a/integration_test/windows_i18n_shot_test.dart b/integration_test/windows_i18n_shot_test.dart
index 60e3c37..c73972e 100644
--- a/integration_test/windows_i18n_shot_test.dart
+++ b/integration_test/windows_i18n_shot_test.dart
@@ -6,6 +6,7 @@ import 'package:flutter/gestures.dart' show kSecondaryButton;
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
+import 'package:jj_mkvmaker/ui/theme.dart';
 import 'package:jj_mkvmaker/app/app_controller.dart';
 import 'package:jj_mkvmaker/app/i18n_controller.dart';
 import 'package:jj_mkvmaker/core/models.dart';
@@ -20,6 +21,8 @@ import 'package:path/path.dart' as p;
 /// 라이선스 화면 · 글 칸의 복사 · 붙여넣기 메뉴 · 뒤로 버튼 이름. 설정은 메모리에만 (저장하지 않음).
 void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  // ⑦ 밝은 화면 캡처: JJ_SHOT_THEME=light (JJ_SHOT_DIR 를 따로 두어 어두운 것과 견줌)
+  if (Platform.environment['JJ_SHOT_THEME'] == 'light') JjColors.use(Brightness.light);
   final out = Platform.environment['JJ_SHOT_DIR'] ?? p.join(Directory.systemTemp.path, 'jj_shots_i18n');
   final navKey = GlobalKey<NavigatorState>();
   final shotKey = GlobalKey();
@@ -47,6 +50,7 @@ void main() {
       t.view.physicalSize = const Size(1280, 800);
       t.view.devicePixelRatio = 1;
       final c = AppController(PlatformServices(mediaTool: ProcessMediaTool('x', 'y'), storage: DesktopStorageService()));
+      if (Platform.environment['JJ_SHOT_THEME'] == 'light') c.settings.uiBrightness = 'light';
       await t.runAsync(() => i18n.apply(lang, save: false));
       await t.runAsync(() => t.pumpWidget(RepaintBoundary(key: shotKey, child: JjMkvMakerApp(controller: c, navigatorKey: navKey))));
       await settle(t);
@@ -88,6 +92,7 @@ void main() {
         t.view.devicePixelRatio = 1;
         addTearDown(t.view.reset);
         final c = AppController(PlatformServices.create());
+        if (Platform.environment['JJ_SHOT_THEME'] == 'light') c.settings.uiBrightness = 'light';
         for (var i = 0; i < checked; i++) {
           final v = VideoItem(p.join(Directory.systemTemp.path, 'jj_i18n_none', 'v$i.mp4'));
           c.videos.add(v);
diff --git a/integration_test/windows_magnet_shot_test.dart b/integration_test/windows_magnet_shot_test.dart
index 8e22e26..81b7565 100644
--- a/integration_test/windows_magnet_shot_test.dart
+++ b/integration_test/windows_magnet_shot_test.dart
@@ -43,6 +43,8 @@ class _Quiet implements DownloadBackend {
 /// 실행: flutter test integration_test\windows_magnet_shot_test.dart -d windows   (JJ_SHOT_DIR 에 PNG)
 void main() {
   IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  // ⑦ 밝은 화면 캡처: JJ_SHOT_THEME=light (JJ_SHOT_DIR 를 따로 두어 어두운 것과 견줌)
+  if (Platform.environment['JJ_SHOT_THEME'] == 'light') JjColors.use(Brightness.light);
   final out = Platform.environment['JJ_SHOT_DIR'] ?? p.join(Directory.systemTemp.path, 'jj_shots_magnet');
   const h = 'magnet:?xt=urn:btih:0123456789abcdef0123456789abcdef0123456';
   for (final lang in ['ko', 'en', 'ja']) {
diff --git a/integration_test/windows_reader_shot_test.dart b/integration_test/windows_reader_shot_test.dart
new file mode 100644
index 0000000..3c9c3ff
--- /dev/null
+++ b/integration_test/windows_reader_shot_test.dart
@@ -0,0 +1,62 @@
+import 'dart:io';
+import 'dart:ui' as ui;
+
+import 'package:flutter/material.dart';
+import 'package:flutter/rendering.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:image/image.dart' as img;
+import 'package:integration_test/integration_test.dart';
+import 'package:jj_mkvmaker/app/app_controller.dart';
+import 'package:jj_mkvmaker/core/reader_sources.dart';
+import 'package:jj_mkvmaker/platform/windows/desktop_storage_service.dart';
+import 'package:jj_mkvmaker/platform/windows/process_media_tool.dart';
+import 'package:jj_mkvmaker/services/platform_services.dart';
+import 'package:jj_mkvmaker/ui/reader_page.dart';
+import 'package:jj_mkvmaker/ui/theme.dart';
+import 'package:path/path.dart' as p;
+
+/// ⑦ 밝은 화면 (관리자 지시 10/21): 보기 화면 (그림 · 위아래 막대 · 썸네일 줄) 을 PNG 로 (JJ_SHOT_DIR, JJ_SHOT_THEME=light).
+/// 시험 그림은 임시 폴더에만 만들고 끝나면 지운다
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  if (Platform.environment['JJ_SHOT_THEME'] == 'light') JjColors.use(Brightness.light);
+
+  testWidgets('보기 화면 그림', (t) async {
+    final out = Platform.environment['JJ_SHOT_DIR'] ?? p.join(Directory.systemTemp.path, 'jj_shots_reader');
+    Directory(out).createSync(recursive: true);
+    final tmp = Directory.systemTemp.createTempSync('jj_readershot_');
+    addTearDown(() => tmp.deleteSync(recursive: true));
+    final paths = <String>[];
+    for (var i = 0; i < 4; i++) {
+      final im = img.Image(width: 600, height: 400);
+      img.fill(im, color: img.ColorRgb8(40 + i * 50, 120, 200 - i * 40));
+      img.drawString(im, 'page ${i + 1}', font: img.arial48, x: 200, y: 170);
+      final f = File(p.join(tmp.path, 'p${i + 1}.png'))..writeAsBytesSync(img.encodePng(im));
+      paths.add(f.path);
+    }
+    final c = AppController(PlatformServices(mediaTool: ProcessMediaTool('x', 'y'), storage: DesktopStorageService()));
+    final key = GlobalKey();
+    for (final (name, size) in [('960', const Size(960, 600)), ('412', const Size(412, 800))]) {
+      t.view.physicalSize = size;
+      t.view.devicePixelRatio = 1;
+      await t.runAsync(() => t.pumpWidget(RepaintBoundary(
+            key: key,
+            child: MaterialApp(
+              theme: buildTheme(),
+              debugShowCheckedModeBanner: false,
+              home: ReaderPage(c: c, source: ImageFilesSource(paths, tempDir: tmp.path, title: 'shot'), start: 1),
+            ),
+          )));
+      for (var i = 0; i < 20; i++) {
+        await t.runAsync(() => Future<void>.delayed(const Duration(milliseconds: 100)));
+        await t.pump(const Duration(milliseconds: 50));
+      }
+      final boundary = key.currentContext!.findRenderObject()! as RenderRepaintBoundary;
+      final image = await t.runAsync(() => boundary.toImage());
+      final bytes = await t.runAsync(() => image!.toByteData(format: ui.ImageByteFormat.png));
+      File(p.join(out, 'reader_$name.png')).writeAsBytesSync(bytes!.buffer.asUint8List());
+      await t.pumpWidget(const SizedBox());
+    }
+    t.view.reset();
+  });
+}
diff --git a/lib/ui/ai_dialog.dart b/lib/ui/ai_dialog.dart
index 3eb4694..e49270a 100644
--- a/lib/ui/ai_dialog.dart
+++ b/lib/ui/ai_dialog.dart
@@ -117,7 +117,7 @@ String aiStartNotice(List<VideoItem> videos, AiOptions o, {required bool thenBui
 }
 
 /// 138: AI 작업 (자막 · 자막 & MKV) 의 색 - [MKV 만들기] (청록) 와 헷갈리지 않게
-const aiColor = Color(0xFFB388FF);
+Color get aiColor => JjColors.isLight ? const Color(0xFF6A3FC8) : const Color(0xFFB388FF); // ⑦ 밝은 화면은 진한 보라 (대비 4.5:1)
 
 /// 138: AI 작업 시간 어림 (분): 영상 1시간 ≈ 음성인식 15~30분 + 번역할 언어마다 10~20분. 길이를 모르면 null
 (int, int)? aiEstimateMinutes(Duration total, int translateLanguages) {
diff --git a/lib/ui/audio_now_playing.dart b/lib/ui/audio_now_playing.dart
index a52fe88..def9040 100644
--- a/lib/ui/audio_now_playing.dart
+++ b/lib/ui/audio_now_playing.dart
@@ -50,7 +50,8 @@ class AudioNowPlaying extends StatelessWidget {
             valueListenable: state,
             builder: (_, s, _) => Text(
               '${_t(s.position)} / ${_t(s.duration)}',
-              style: TextStyle(color: JjColors.textDim, fontSize: 14, fontFeatures: [FontFeature.tabularFigures()]),
+              // 검은 바탕 위 - 밝은 화면에서도 어두운 화면의 흐린 글자색
+              style: TextStyle(color: JjPalette.dark.textDim, fontSize: 14, fontFeatures: [FontFeature.tabularFigures()]),
             ),
           ),
         ]),
@@ -65,7 +66,7 @@ class _Note extends StatelessWidget {
         aspectRatio: 1,
         child: DecoratedBox(
           decoration: BoxDecoration(color: Color(0xFF1E1E1E), borderRadius: BorderRadius.all(Radius.circular(12))),
-          child: Center(child: Icon(Icons.music_note, size: 96, color: JjColors.textDim)),
+          child: Center(child: Icon(Icons.music_note, size: 96, color: JjPalette.dark.textDim)),
         ),
       );
 }
diff --git a/lib/ui/downloads_page.dart b/lib/ui/downloads_page.dart
index 1dd5ea0..8fa08a4 100644
--- a/lib/ui/downloads_page.dart
+++ b/lib/ui/downloads_page.dart
@@ -443,8 +443,9 @@ class DownloadProgressBar extends StatelessWidget {
                 fontSize: height * 0.62,
                 height: 1,
                 fontWeight: FontWeight.w600,
-                color: Colors.white,
-                shadows: const [Shadow(blurRadius: 2, color: Colors.black)],
+                // ⑦ 밝은 화면: 옅은 막대 위에서도 읽히게 진한 글자 + 흰 테두리
+                color: JjColors.isLight ? JjColors.text : Colors.white,
+                shadows: JjColors.isLight ? const [Shadow(blurRadius: 3, color: Colors.white)] : const [Shadow(blurRadius: 2, color: Colors.black)],
               ),
             ),
           ),
diff --git a/lib/ui/player_page.dart b/lib/ui/player_page.dart
index 995f902..050b36d 100644
--- a/lib/ui/player_page.dart
+++ b/lib/ui/player_page.dart
@@ -439,7 +439,8 @@ class _PlayerPageState extends State<PlayerPage> {
                 icon: Icon(i),
               );
           return Container(
-            color: (_full || _popup) ? Colors.black.withValues(alpha: 0.6) : JjColors.panel,
+            // ⑦ 재생 막대는 밝은 화면에서도 어두운 띠 (흰 단추 · 시각 글자가 보이게)
+            color: (_full || _popup) ? Colors.black.withValues(alpha: 0.6) : JjPalette.dark.panel,
             padding: const EdgeInsets.fromLTRB(8, 0, 8, 4),
             child: Column(mainAxisSize: MainAxisSize.min, children: [
               Row(children: [
@@ -447,7 +448,14 @@ class _PlayerPageState extends State<PlayerPage> {
                     style: const TextStyle(fontSize: 12, color: Colors.white70, fontFamily: 'Consolas')),
                 Expanded(
                   child: SliderTheme(
-                    data: const SliderThemeData(trackHeight: 3, overlayShape: RoundSliderOverlayShape(overlayRadius: 10)),
+                    data: JjColors.isLight
+                        ? SliderThemeData(
+                            trackHeight: 3,
+                            overlayShape: const RoundSliderOverlayShape(overlayRadius: 10),
+                            activeTrackColor: JjPalette.dark.accent,
+                            thumbColor: JjPalette.dark.accent,
+                            inactiveTrackColor: Colors.white24)
+                        : const SliderThemeData(trackHeight: 3, overlayShape: RoundSliderOverlayShape(overlayRadius: 10)),
                     child: Slider(
                       value: pos,
                       max: total <= 0 ? 1 : total,
diff --git a/lib/ui/reader_page.dart b/lib/ui/reader_page.dart
index 0d42080..4822304 100644
--- a/lib/ui/reader_page.dart
+++ b/lib/ui/reader_page.dart
@@ -804,7 +804,8 @@ class _ReaderPageState extends State<ReaderPage> {
 
   Widget _barButton(_Act a, {bool compact = false}) => IconButton(
         tooltip: a.tip,
-        color: a.on ? JjColors.accent : Colors.white,
+        // 막대는 밝은 화면에서도 어두운 띠 - 강조는 어두운 화면의 청록 (밝은 화면의 진한 청록은 어두운 띠 위에서 안 보임)
+        color: a.on ? JjPalette.dark.accent : Colors.white,
         disabledColor: Colors.white38,
         icon: a.icon,
         visualDensity: compact ? VisualDensity.compact : null,
@@ -1005,7 +1006,7 @@ class _ReaderPageState extends State<ReaderPage> {
             child: Container(
               margin: const EdgeInsets.all(3),
               decoration: BoxDecoration(
-                  border: Border.all(color: i == _cur.page ? JjColors.accent : Colors.white24, width: i == _cur.page ? 2 : 1)),
+                  border: Border.all(color: i == _cur.page ? JjPalette.dark.accent : Colors.white24, width: i == _cur.page ? 2 : 1)),
               child: FutureBuilder<ReaderImage>(
                 future: _thumb(i),
                 builder: (_, snap) {
@@ -1048,6 +1049,8 @@ class _ReaderPageState extends State<ReaderPage> {
                     max: (count - 1).toDouble(),
                     divisions: count - 1,
                     onChanged: (v) => _pages.jumpToPage(v.round()),
+                    // ⑦ 어두운 막대 위 - 밝은 화면에서도 어두운 화면의 청록 (null 이면 테마 그대로)
+                    activeColor: JjColors.isLight ? JjPalette.dark.accent : null,
                   ),
                 ),
         ),
diff --git a/lib/ui/timeline.dart b/lib/ui/timeline.dart
index 17f98d7..1999bd8 100644
--- a/lib/ui/timeline.dart
+++ b/lib/ui/timeline.dart
@@ -151,7 +151,8 @@ class _SubtitleTimelineState extends State<SubtitleTimeline> {
                       top: 0,
                       bottom: 0,
                       child: IgnorePointer(
-                        child: Container(width: 2, color: Colors.white),
+                        // ⑦ 밝은 화면: 흰 선은 밝은 바탕에서 안 보여 글자색으로
+                        child: Container(width: 2, color: JjColors.isLight ? JjColors.text : Colors.white),
                       ),
                     );
                   },
@@ -254,7 +255,7 @@ class _SubtitleTimelineState extends State<SubtitleTimeline> {
                     style: TextStyle(
                         fontSize: 11,
                         height: 1.2,
-                        color: sel ? Colors.black : JjColors.text),
+                        color: sel ? (JjColors.isLight ? JjColors.onAccent : Colors.black) : JjColors.text),
                   ),
                 ),
               ),
diff --git a/test/vault_page_test.dart b/test/vault_page_test.dart
index a399aa7..ad5d033 100644
--- a/test/vault_page_test.dart
+++ b/test/vault_page_test.dart
@@ -29,11 +29,20 @@ void main() {
     Directory(p.join(tmp.path, 'out')).createSync();
     vaultIterationsForTest = 1000;
   });
-  tearDown(() {
+  tearDown(() async {
     vaultDirOf = was;
     vaultPickFolder = wasPick;
     MasterLock.instance = null;
-    tmp.deleteSync(recursive: true);
+    // Windows 는 막 쓴 파일을 백신 · 색인이 잠깐 잡고 있을 수 있다 (errno 32) - 몇 번 더
+    for (var i = 0; ; i++) {
+      try {
+        tmp.deleteSync(recursive: true);
+        break;
+      } on FileSystemException {
+        if (i >= 20) rethrow;
+        await Future<void>.delayed(const Duration(milliseconds: 250));
+      }
+    }
   });
 
   AppController ctl() {