diff --git a/client/lib/core/theme/app_chrome.g.dart b/client/lib/core/theme/app_chrome.g.dart
new file mode 100644
index 0000000..12badb9
--- /dev/null
+++ b/client/lib/core/theme/app_chrome.g.dart
@@ -0,0 +1,21 @@
+// GENERATED by tool/gen_tokens.mjs — DO NOT EDIT.
+// 源：lib/core/theme/token_source/tokens.css（:root 共享块的主题无关颜色）。改色请改源后重跑脚本。
+// 外壳 chrome 色：状态栏/品牌/遮罩/Toast，固定不随 A/B/C 主题切换。
+import 'package:flutter/material.dart';
+
+class AppChrome {
+  AppChrome._();
+  static const Color statusbarBg = Color(0xFF37423D);
+  static const Color statusbarFg = Color(0xd1FFFFFF);
+  static const Color statusbarMuted = Color(0x75FFFFFF);
+  static const Color statusbarStrong = Color(0xFFFFFFFF);
+  static const Color statusbarDiv = Color(0x21FFFFFF);
+  static const Color statusbarOk = Color(0xFF7BC49A);
+  static const Color brandDeep = Color(0xFF0F3057);
+  static const Color brandMid = Color(0xFF1B4F8E);
+  static const Color brandWine = Color(0xFF8B2331);
+  static const Color scrim = Color(0x6b0F141E);
+  static const Color heroGlass = Color(0x29FFFFFF);
+  static const Color heroGlassStrong = Color(0x3dFFFFFF);
+  static const Color toastBg = Color(0xFF1F2330);
+}
diff --git a/client/tool/gen_tokens.mjs b/client/tool/gen_tokens.mjs
index 9cfa637..19eee11 100644
--- a/client/tool/gen_tokens.mjs
+++ b/client/tool/gen_tokens.mjs
@@ -119,3 +119,37 @@ ${emitDims()}
 `;
 fs.writeFileSync(path.join(ROOT, 'lib/core/theme/app_dims.g.dart'), dimsBody);
 console.log('generated app_dims.g.dart');
+
+// ── 主题无关「chrome 色」：:root 里固定不随主题切换的颜色 → AppChrome 常量类 ──
+// 底部状态栏(深石板灰绿条)、品牌标识色(logo/字标)、遮罩/玻璃叠加、Toast 深底。
+// 外壳(状态栏/品牌)要用，但不属任何主题，故不进 per-theme AppTokens。
+const CHROME = {
+  // 状态栏（底部 chrome 条）
+  'statusbar-bg':'statusbarBg','statusbar-fg':'statusbarFg','statusbar-muted':'statusbarMuted',
+  'statusbar-strong':'statusbarStrong','statusbar-div':'statusbarDiv','statusbar-ok':'statusbarOk',
+  // 品牌标识色（固定不随主题）
+  'brand-deep':'brandDeep','brand-mid':'brandMid','brand-wine':'brandWine',
+  // 遮罩 / 玻璃叠加
+  'scrim':'scrim','hero-glass':'heroGlass','hero-glass-strong':'heroGlassStrong',
+  // Toast 深底
+  'toast-bg':'toastBg',
+};
+function emitChrome(){
+  const r = rootBlock();
+  return Object.entries(CHROME).map(([css,dart])=>{
+    if(r[css]===undefined) throw new Error(`:root missing --${css}`);
+    return `  static const Color ${dart} = ${toColor(r[css])};`;
+  }).join('\n');
+}
+const chromeBody = `// GENERATED by tool/gen_tokens.mjs — DO NOT EDIT.
+// 源：lib/core/theme/token_source/tokens.css（:root 共享块的主题无关颜色）。改色请改源后重跑脚本。
+// 外壳 chrome 色：状态栏/品牌/遮罩/Toast，固定不随 A/B/C 主题切换。
+import 'package:flutter/material.dart';
+
+class AppChrome {
+  AppChrome._();
+${emitChrome()}
+}
+`;
+fs.writeFileSync(path.join(ROOT, 'lib/core/theme/app_chrome.g.dart'), chromeBody);
+console.log('generated app_chrome.g.dart');