diff --git a/docs/project-memory/shared-memory/pitfalls.md b/docs/project-memory/shared-memory/pitfalls.md
index 2a26c235f..d2ed6fe6d 100644
--- a/docs/project-memory/shared-memory/pitfalls.md
+++ b/docs/project-memory/shared-memory/pitfalls.md
@@ -376,6 +376,14 @@
 - 验证：测试断言菜单不包含在底部工具栏 / 参考图行里，并且生成面板打开时底部 `AI画布工具栏` 仍存在；规范参考图来源菜单应能通过 portal 点击“从画布中选择 / 上传图片”并写回规范参考图。
 - 关联：`src/components/common/PlatformFloatingMenu.tsx`、`src/components/image-editor/ImageCanvasEditorView.tsx`、`src/components/image-editor/ImageCanvasEditorGenerationIntegration.test.tsx`。
 
+## 图片编辑器 portal 菜单必须显式继承画板主题 token
+
+- 现象：生成视频参数面板里点击“静音”后，开关轨道和白色滑块一起消失；如果直接把轨道改成 `#00ff00`，虽然重新可见，却变成与画板主题不一致的荧光绿。相同比例、清晰度、slider、时长文字和模型选中勾选也可能丢失选中态主题。
+- 原因：`renderEditorPortal(...)` 把 `.image-canvas-editor__portal-menu` 挂到 `document.body`，它不再是 `.image-canvas-editor` 的后代，无法继承只定义在编辑器根节点上的 `--image-canvas-brand-*` 自定义属性。浏览器会把依赖缺失变量且没有 fallback 的声明按无效值处理，轨道背景最终为透明。
+- 处理：portal 继续挂到 `document.body` 以避免局部 `overflow` 裁切，但外层必须通过 `.image-canvas-editor__portal-theme` 同步当前 `platform-theme--light / platform-theme--dark`；画板品牌 token 由 `.image-canvas-editor`、主题桥接层与 `.image-canvas-editor__portal-menu` 共用同一组声明。控件继续消费主题变量，不使用单点硬编码颜色，也不要只给静音轨道补 fallback 而遗漏同一 portal 内其它 token 消费者。
+- 验证：`scripts/image-canvas-portal-theme.test.ts` 应锁定编辑器根节点、portal 主题桥接层与 portal 菜单共享完整品牌 token，静音 pressed 轨道仍使用 `var(--image-canvas-brand-accent)` 且不出现 `#00ff00`；`useImageCanvasGenerationSurface.test.tsx` 应覆盖暗色主题 class 被桥接到 `document.body` 下的 portal。真实浏览器从 `生成视频 -> 视频参数 -> 静音` 点击后，轨道 computed background 应为非透明当前主题色，portal 内 `--image-canvas-brand-accent`、`--image-canvas-brand-border-strong` 和 `--image-canvas-brand-soft` 均应有值。
+- 关联：`src/index.css`、`scripts/image-canvas-portal-theme.test.ts`、`src/components/image-editor/ImageCanvasEditorPortal.tsx`、`src/components/image-editor/useImageCanvasGenerationSurface.tsx`、`src/components/image-editor/ImageCanvasGenerationComposerView.tsx`。
+
 ## 图片编辑器规范图片面板不要脱离统一生成 shell
 
 - 现象：生成 UI 设计图或新建图标规范时，面板参考图、输入区和底部生成按钮相对生成图片 / 生成角色 / 生成视频错位；图标规范甚至可能缺少首行参考图入口。
diff --git a/docs/technical/【前端架构】图片画布编辑器MVP接入方案-2026-06-11.md b/docs/technical/【前端架构】图片画布编辑器MVP接入方案-2026-06-11.md
index 478583ba6..043e13bf9 100644
--- a/docs/technical/【前端架构】图片画布编辑器MVP接入方案-2026-06-11.md
+++ b/docs/technical/【前端架构】图片画布编辑器MVP接入方案-2026-06-11.md
@@ -121,6 +121,7 @@
 - 生成器快照刷新后必须恢复；待生成、生成中、失败和已生成后跟随成品图层的生成器都不能因为刷新丢失输入、参数、参考图或占位框位置。宣发素材生成器刷新后必须继续显示正确的卡片类型、游戏名、分类、描述和已绑定参考图。
 - 画布多选语义必须同时覆盖普通图层和仍显示占位框的生成器对象：Shift 点选或框选可把生成器加入当前选择；拖动任一已选图层或生成器时，所有已选普通图层和生成器占位框同步移动；删除 / Backspace / Delete 作用于完整选择集合，移除所有已选图层和生成器对象。生成器对象在选择集合中使用稳定 `generation-dialog:<id>` 目标 ID，不把生成器伪装成普通图层，也不新增后端表。
 - 生成类入口打开画布内面板时，底部 AI 工具栏必须保持可见；`生成规范`、角色 / 图标规范来源、角色常规参考图来源这类轻量菜单通过页面级 fixed portal 渲染，不能留在底部工具栏或参考图横向滚动容器内部，避免被局部 `overflow` 裁切。角色规范和常规参考图来源菜单必须向上弹出；常规参考图点击后先选择“从画布中选择”或“上传图片”，从画布取图时只绑定参考图，不触发普通画布图层选中、聚焦、面板隐藏或拖拽逻辑，绑定后退出画布选择状态。所有生成面板参考图槽位统一为方形图标组件；角色规范槽位只显示规范 logo 和 `角色规范` 四字，绑定来源标题只保留给可访问名称、悬浮 title 和图片信息。已有参考图槽位只有在 hover / focus 时显示右上角 `×`，点击后只解绑对应参考图。角色形象生成面板每次成功绑定角色规范后，在当前编辑器生命周期内缓存为上一张角色规范；再次新建角色形象时自动带入该缓存。图标素材和 UI 设计图面板每次成功绑定图标规范后，同样缓存为上一张图标规范；再次新建需要图标规范的素材时自动带入该缓存。生成规范菜单里的图标规范对象自身只把首行参考图作为可选参考，不要求必须先绑定图标规范。
+- 所有挂到 `document.body` 的 `.image-canvas-editor__portal-menu` 必须放在同步当前 `platform-theme--light / platform-theme--dark` 的 `.image-canvas-editor__portal-theme` 桥接层下，并与 `.image-canvas-editor` 共用完整的 `--image-canvas-brand-*` token 声明。portal 内的比例 / 清晰度选中态、视频和音频 slider、静音开关、时长文字与模型选中勾选继续消费同一组主题变量；不得用 `#00ff00` 等硬编码颜色绕过变量作用域，也不得只修单个控件而让其它 portal 选中态继续退回无效声明。
 - 生成规范类图片面板底部必须以禁用态参数按钮显示 `16:9·2K` 和 `gpt-image-2`，视觉对齐可编辑面板参数控件，提交到 `/api/editor/images/generations` 时也固定携带这些参数。
 - 快速编辑面板底部只显示模型选择和 `修改` 按钮；打开时视口聚焦必须预留底部面板空间，面板位于素材下方，不得遮挡原素材，且素材在当前屏幕内完整可见。快速编辑请求只把原图或红框序号标注图作为 `sourceImageSrc` 直接提交，信息面板输入快照只展示用户填写的快速编辑提示词。
 - 点击生成、生成规范、生成角色形象或生成图标素材后创建的占位图可继续保留；点击画布空白区域让当前图片或占位图失焦时，关闭当前生成面板并移除图片选中样式，但不删除占位图本身。
diff --git a/scripts/image-canvas-portal-theme.test.ts b/scripts/image-canvas-portal-theme.test.ts
new file mode 100644
index 000000000..1b176553d
--- /dev/null
+++ b/scripts/image-canvas-portal-theme.test.ts
@@ -0,0 +1,83 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+import { describe, expect, it } from 'vitest';
+
+function readIndexCss() {
+  return fs.readFileSync(path.resolve(process.cwd(), 'src/index.css'), 'utf8');
+}
+
+function getCssBlock(source: string, selector: string) {
+  const selectorIndex = source.indexOf(selector);
+  expect(selectorIndex, `${selector} should exist`).toBeGreaterThanOrEqual(0);
+
+  const openBraceIndex = source.indexOf('{', selectorIndex);
+  expect(
+    openBraceIndex,
+    `${selector} should open a CSS block`,
+  ).toBeGreaterThanOrEqual(0);
+
+  let depth = 0;
+  for (let index = openBraceIndex; index < source.length; index += 1) {
+    const char = source[index];
+    if (char === '{') {
+      depth += 1;
+    } else if (char === '}') {
+      depth -= 1;
+      if (depth === 0) {
+        return source.slice(openBraceIndex + 1, index);
+      }
+    }
+  }
+
+  throw new Error(`${selector} block is not closed`);
+}
+
+describe('image canvas portal theme contract', () => {
+  it('exposes every image canvas brand token to body-level portal menus', () => {
+    const css = readIndexCss();
+    const sharedTokenBlock = getCssBlock(
+      css,
+      '.image-canvas-editor,\n.image-canvas-editor__portal-theme,\n.image-canvas-editor__portal-menu',
+    );
+    const editorBlock = getCssBlock(css, '.image-canvas-editor {');
+    const pressedToggleTrackBlock = getCssBlock(
+      css,
+      ".image-canvas-editor__video-toggle[aria-pressed='true'] span",
+    );
+
+    for (const token of [
+      '--image-canvas-brand-accent:',
+      '--image-canvas-brand-accent-strong:',
+      '--image-canvas-brand-fill:',
+      '--image-canvas-brand-text-on-fill:',
+      '--image-canvas-brand-border:',
+      '--image-canvas-brand-border-strong:',
+      '--image-canvas-brand-border-soft:',
+      '--image-canvas-brand-soft:',
+      '--image-canvas-brand-soft-strong:',
+      '--image-canvas-brand-shadow:',
+      '--image-canvas-brand-focus-ring:',
+    ]) {
+      expect(sharedTokenBlock).toContain(token);
+    }
+
+    for (const editorOnlyDeclaration of [
+      'position:',
+      'display:',
+      'height:',
+      'overflow:',
+      'background:',
+      'color:',
+      'user-select:',
+    ]) {
+      expect(sharedTokenBlock).not.toContain(editorOnlyDeclaration);
+    }
+
+    expect(editorBlock).not.toContain('--image-canvas-brand-accent:');
+    expect(pressedToggleTrackBlock).toContain(
+      'background: var(--image-canvas-brand-accent);',
+    );
+    expect(pressedToggleTrackBlock).not.toContain('#00ff00');
+  });
+});
diff --git a/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.test.tsx b/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.test.tsx
index 84e0d5b48..27f29f47c 100644
--- a/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.test.tsx
+++ b/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.test.tsx
@@ -128,6 +128,11 @@ describe('ImageCanvasCharacterAnimationPanelView', () => {
     expect(screen.getByLabelText('当前分辨率').textContent).toBe('720p');
     expect(screen.getByLabelText('当前比例').textContent).toBe('16:9');
     expect(menu).toBeTruthy();
+    expect(
+      menu
+        .closest('.image-canvas-editor__portal-theme')
+        ?.classList.contains('platform-theme--light'),
+    ).toBe(true);
     expect(screen.getByLabelText('当前状态').textContent).toBe('idle');
     expect(screen.getByLabelText('当前错误').textContent).toBe('-');
   });
diff --git a/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx b/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx
index 0482a424a..015a36e9a 100644
--- a/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx
+++ b/src/components/image-editor/ImageCanvasCharacterAnimationPanelView.tsx
@@ -8,7 +8,6 @@ import {
   useRef,
   useState,
 } from 'react';
-import { createPortal } from 'react-dom';
 
 import type {
   EditorCharacterAnimationRatio,
@@ -19,6 +18,7 @@ import { PlatformFloatingMenu } from '../common/PlatformFloatingMenu';
 import { PlatformInlineOptionButton } from '../common/PlatformInlineOptionButton';
 import { PlatformStatusMessage } from '../common/PlatformStatusMessage';
 import { PlatformTextField } from '../common/PlatformTextField';
+import { ImageCanvasEditorPortal } from './ImageCanvasEditorPortal';
 import { EditorIconButton } from './ImageCanvasEditorPrimitives';
 import type {
   CanvasLayer,
@@ -79,11 +79,8 @@ function buildLocalMenuStyle(anchor: HTMLElement | null): CSSProperties {
 }
 
 function renderPanelPortal(node: ReactNode) {
-  if (typeof document === 'undefined') {
-    return node;
-  }
   // 中文注释：参数菜单挂到页面级，避免被角色动画面板滚动边界裁切。
-  return document.body ? createPortal(node, document.body) : node;
+  return <ImageCanvasEditorPortal>{node}</ImageCanvasEditorPortal>;
 }
 
 function getRatioLabel(value: EditorCharacterAnimationRatio) {
diff --git a/src/components/image-editor/ImageCanvasEditorPortal.tsx b/src/components/image-editor/ImageCanvasEditorPortal.tsx
new file mode 100644
index 000000000..534d5ec98
--- /dev/null
+++ b/src/components/image-editor/ImageCanvasEditorPortal.tsx
@@ -0,0 +1,21 @@
+import type { ReactNode } from 'react';
+import { createPortal } from 'react-dom';
+
+import { useAuthUi } from '../auth/AuthUiContext';
+
+export function ImageCanvasEditorPortal({ children }: { children: ReactNode }) {
+  const platformTheme = useAuthUi()?.platformTheme ?? 'light';
+
+  if (typeof document === 'undefined') {
+    return <>{children}</>;
+  }
+
+  return createPortal(
+    <div
+      className={`platform-theme platform-theme--${platformTheme} image-canvas-editor__portal-theme`}
+    >
+      {children}
+    </div>,
+    document.body,
+  );
+}
diff --git a/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx b/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
index 6a17e51c5..fcf7d2ebe 100644
--- a/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
+++ b/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
@@ -554,6 +554,11 @@ describe('ImageCanvasGenerationComposerView', () => {
     const paramsPanel = screen.getByRole('menu', {
       name: '视频参数选项',
     });
+    expect(
+      paramsPanel
+        .closest('.image-canvas-editor__portal-theme')
+        ?.classList.contains('platform-theme--light'),
+    ).toBe(true);
     const ratioChoice = within(paramsPanel).getByRole('button', {
       name: '比例 16:9',
     });
diff --git a/src/components/image-editor/ImageCanvasGenerationComposerView.tsx b/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
index 9d4f3fa96..1756f8174 100644
--- a/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
+++ b/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
@@ -9,7 +9,6 @@ import {
   useRef,
   useState,
 } from 'react';
-import { createPortal } from 'react-dom';
 
 import { PlatformActionButton } from '../common/PlatformActionButton';
 import {
@@ -24,6 +23,7 @@ import { ImageCanvasCharacterAnimationPanelView } from './ImageCanvasCharacterAn
 import { ImageCanvasCharacterGenerationComposerView } from './ImageCanvasCharacterGenerationComposerView';
 import { ImageCanvasCropExpandPanelView } from './ImageCanvasCropExpandPanelView';
 import { ImageCanvasEditGenerationModalView } from './ImageCanvasEditGenerationModalView';
+import { ImageCanvasEditorPortal } from './ImageCanvasEditorPortal';
 import type {
   CanvasLayer,
   CharacterAnimationPanelState,
@@ -162,10 +162,7 @@ function buildPortalMenuStyle(
 }
 
 function renderEditorPortal(node: ReactNode) {
-  if (typeof document === 'undefined') {
-    return node;
-  }
-  return createPortal(node, document.body);
+  return <ImageCanvasEditorPortal>{node}</ImageCanvasEditorPortal>;
 }
 
 function resetFailedVideoDialogStatus(dialog: GenerateDialogState) {
diff --git a/src/components/image-editor/useImageCanvasGenerationSurface.test.tsx b/src/components/image-editor/useImageCanvasGenerationSurface.test.tsx
index 7996aeff9..fab101b69 100644
--- a/src/components/image-editor/useImageCanvasGenerationSurface.test.tsx
+++ b/src/components/image-editor/useImageCanvasGenerationSurface.test.tsx
@@ -14,6 +14,16 @@ import type {
 import { useCanvasGenerationDialogs } from './useCanvasGenerationDialogs';
 import { useImageCanvasGenerationSurface } from './useImageCanvasGenerationSurface';
 
+const { mockUseAuthUi } = vi.hoisted(() => ({
+  mockUseAuthUi: vi.fn(() => ({
+    platformTheme: 'light' as 'light' | 'dark',
+  })),
+}));
+
+vi.mock('../auth/AuthUiContext', () => ({
+  useAuthUi: mockUseAuthUi,
+}));
+
 vi.mock('../../services/image-editor/editorImageReference', () => ({
   resolveEditorImageReferenceDataUrl: vi.fn(async (src: string) => src),
 }));
@@ -35,6 +45,7 @@ let mockedComposerRect: DOMRect | null = null;
 let originalGetBoundingClientRect: typeof Element.prototype.getBoundingClientRect;
 
 beforeEach(() => {
+  mockUseAuthUi.mockReturnValue({ platformTheme: 'light' });
   originalGetBoundingClientRect = Element.prototype.getBoundingClientRect;
   Element.prototype.getBoundingClientRect = function getBoundingClientRect() {
     if (
@@ -302,6 +313,19 @@ describe('useImageCanvasGenerationSurface', () => {
     ).toBeTruthy();
   });
 
+  it('bridges the current platform theme into body-level portal menus', () => {
+    mockUseAuthUi.mockReturnValue({ platformTheme: 'dark' });
+    render(<GenerationSurfaceHarness />);
+
+    fireEvent.click(screen.getByRole('button', { name: '切换规范' }));
+    const menu = screen.getByRole('menu', { name: '生成规范类型' });
+    const themeBridge = menu.closest('.image-canvas-editor__portal-theme');
+
+    expect(themeBridge?.parentElement).toBe(document.body);
+    expect(themeBridge?.classList.contains('platform-theme')).toBe(true);
+    expect(themeBridge?.classList.contains('platform-theme--dark')).toBe(true);
+  });
+
   it('renders a warning toast when a non-spec layer is picked as character spec', () => {
     render(<GenerationSurfaceHarness />);
 
diff --git a/src/components/image-editor/useImageCanvasGenerationSurface.tsx b/src/components/image-editor/useImageCanvasGenerationSurface.tsx
index 240379ca1..778fd491e 100644
--- a/src/components/image-editor/useImageCanvasGenerationSurface.tsx
+++ b/src/components/image-editor/useImageCanvasGenerationSurface.tsx
@@ -10,7 +10,6 @@ import {
   useEffect,
   useRef,
 } from 'react';
-import { createPortal } from 'react-dom';
 
 import type {
   EditorAssetSnapshot,
@@ -21,6 +20,7 @@ import {
   PlatformFloatingMenuItem,
 } from '../common/PlatformFloatingMenu';
 import { PlatformRuntimeStatusToast } from '../common/PlatformRuntimeStatusToast';
+import { ImageCanvasEditorPortal } from './ImageCanvasEditorPortal';
 import type {
   CanvasGenerationDialogState,
   CanvasHistoryAction,
@@ -110,10 +110,7 @@ type ImageCanvasGenerationSurfaceOptions = {
 };
 
 function renderEditorPortal(node: ReactNode) {
-  if (typeof document === 'undefined') {
-    return node;
-  }
-  return createPortal(node, document.body);
+  return <ImageCanvasEditorPortal>{node}</ImageCanvasEditorPortal>;
 }
 
 function buildToolbarPortalMenuStyle(
diff --git a/src/index.css b/src/index.css
index 6fd708151..a8ac24ccb 100644
--- a/src/index.css
+++ b/src/index.css
@@ -3899,16 +3899,9 @@ html[data-mobile-keyboard-open='true'] .platform-mobile-bottom-dock {
   }
 }
 
-.image-canvas-editor {
-  position: relative;
-  display: flex;
-  min-height: 0;
-  min-width: 0;
-  height: 100%;
-  gap: 0;
-  overflow: hidden;
-  background: #ffffff;
-  color: #1f2937;
+.image-canvas-editor,
+.image-canvas-editor__portal-theme,
+.image-canvas-editor__portal-menu {
   --image-canvas-brand-accent: var(--platform-accent, #c7653d);
   --image-canvas-brand-accent-strong: #6f2f21;
   --image-canvas-brand-fill: var(
@@ -3926,6 +3919,18 @@ html[data-mobile-keyboard-open='true'] .platform-mobile-bottom-dock {
   --image-canvas-brand-soft-strong: rgba(238, 208, 183, 0.46);
   --image-canvas-brand-shadow: rgba(182, 98, 63, 0.16);
   --image-canvas-brand-focus-ring: rgba(204, 117, 76, 0.18);
+}
+
+.image-canvas-editor {
+  position: relative;
+  display: flex;
+  min-height: 0;
+  min-width: 0;
+  height: 100%;
+  gap: 0;
+  overflow: hidden;
+  background: #ffffff;
+  color: #1f2937;
   -webkit-touch-callout: none;
   -webkit-user-select: none;
   user-select: none;