diff --git a/src/components/common/PlatformFloatingMenu.test.tsx b/src/components/common/PlatformFloatingMenu.test.tsx
index e4dad62c3..76bc8d47c 100644
--- a/src/components/common/PlatformFloatingMenu.test.tsx
+++ b/src/components/common/PlatformFloatingMenu.test.tsx
@@ -29,6 +29,28 @@ describe('PlatformFloatingMenu', () => {
     expect(onRename).toHaveBeenCalledOnce();
   });
 
+  it('drops menu semantics for the parameter options variant', () => {
+    render(
+      <PlatformFloatingMenu
+        label="音效时长选项"
+        variant="options"
+        placement="top-start"
+      >
+        <label>
+          <input type="checkbox" aria-label="自动时长" readOnly checked />
+          自动时长
+        </label>
+        <input type="range" aria-label="手动音效时长" readOnly value={5} />
+      </PlatformFloatingMenu>,
+    );
+
+    // 复选框与滑块都不是 menu 的合法子角色，浮层必须退回普通分组语义。
+    expect(screen.getByRole('group', { name: '音效时长选项' })).toBeTruthy();
+    expect(screen.queryByRole('menu', { name: '音效时长选项' })).toBeNull();
+    expect(screen.getByRole('checkbox', { name: '自动时长' })).toBeTruthy();
+    expect(screen.getByRole('slider', { name: '手动音效时长' })).toBeTruthy();
+  });
+
   it('keeps pointer events from leaking to canvas-style parents', () => {
     const onParentPointerDown = vi.fn();
     const onMenuPointerDown = vi.fn();
diff --git a/src/components/common/PlatformFloatingMenu.tsx b/src/components/common/PlatformFloatingMenu.tsx
index 1fcf7ab1d..fd4c25fd6 100644
--- a/src/components/common/PlatformFloatingMenu.tsx
+++ b/src/components/common/PlatformFloatingMenu.tsx
@@ -1,11 +1,19 @@
 import type { ButtonHTMLAttributes, CSSProperties, HTMLAttributes, ReactNode } from 'react';
 
+/**
+ * `menu` 承载纯动作集合，子节点必须全是 `PlatformFloatingMenuItem`；
+ * `options` 承载参数控件（复选框、滑块、选项按钮），它们不是 menuitem，
+ * 放进 `role="menu"` 既违反 ARIA 子角色约束，也会让读屏进入菜单模式后读不到滑块。
+ */
+type PlatformFloatingMenuVariant = 'menu' | 'options';
+
 type PlatformFloatingMenuProps = HTMLAttributes<HTMLDivElement> & {
   children: ReactNode;
   className?: string;
   label?: string;
   placement?: 'bottom-start' | 'bottom-end' | 'top-start' | 'top-end';
   style?: CSSProperties;
+  variant?: PlatformFloatingMenuVariant;
 };
 
 type PlatformFloatingMenuItemProps = Omit<
@@ -26,6 +34,7 @@ export function PlatformFloatingMenu({
   label,
   placement = 'top-end',
   style,
+  variant = 'menu',
   onPointerDown,
   ...divProps
 }: PlatformFloatingMenuProps) {
@@ -39,7 +48,7 @@ export function PlatformFloatingMenu({
       ]
         .filter(Boolean)
         .join(' ')}
-      role="menu"
+      role={variant === 'options' ? 'group' : 'menu'}
       aria-label={label}
       style={style}
       onPointerDown={(event) => {
diff --git a/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx b/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
index 8ef17d601..71658f146 100644
--- a/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
+++ b/src/components/image-editor/ImageCanvasGenerationComposerView.test.tsx
@@ -1007,7 +1007,7 @@ describe('ImageCanvasGenerationComposerView', () => {
     fireEvent.click(
       within(panel).getByRole('button', { name: '音效时长 5秒' }),
     );
-    const optionPanel = screen.getByRole('menu', { name: '音效时长选项' });
+    const optionPanel = screen.getByRole('group', { name: '音效时长选项' });
     const durationSlider = within(optionPanel).getByRole('slider', {
       name: '手动音效时长',
     }) as HTMLInputElement;
@@ -1592,7 +1592,7 @@ describe('ImageCanvasGenerationComposerView', () => {
       });
 
       fireEvent.click(screen.getByRole('button', { name: '音效时长 5秒' }));
-      expect(screen.getByRole('menu', { name: '音效时长选项' })).toBeTruthy();
+      expect(screen.getByRole('group', { name: '音效时长选项' })).toBeTruthy();
 
       const backgroundMusicDialog = createBackgroundMusicDialog({
         id: 'dialog-bgm-locked',
@@ -1606,7 +1606,7 @@ describe('ImageCanvasGenerationComposerView', () => {
         />,
       );
 
-      expect(screen.queryByRole('menu', { name: '音效时长选项' })).toBeNull();
+      expect(screen.queryByRole('group', { name: '音效时长选项' })).toBeNull();
       expect(getBackgroundMusicPanel().getAttribute('aria-busy')).toBe('true');
 
       view.rerender(
@@ -1634,7 +1634,39 @@ describe('ImageCanvasGenerationComposerView', () => {
           }) as HTMLButtonElement
         ).disabled,
       ).toBe(false);
+      expect(screen.queryByRole('group', { name: '音效时长选项' })).toBeNull();
+    });
+
+    it('音效时长浮层是参数分组，打开后移焦并支持 Escape 关闭回焦', () => {
+      const soundEffectDialog: GenerateDialogState = {
+        id: 'dialog-sfx-options-a11y',
+        mode: 'audio-sound-effect',
+        prompt: '开门声',
+        status: 'idle',
+        composerOpen: true,
+        soundModel: 'eleven_text_to_sound_v2',
+        soundDurationSeconds: 5,
+      };
+      renderComposer(soundEffectDialog);
+
+      const trigger = screen.getByRole('button', { name: '音效时长 5秒' });
+      fireEvent.click(trigger);
+
+      // 复选框和滑块不是 menuitem，浮层不能再声明成菜单。
+      const optionPanel = screen.getByRole('group', { name: '音效时长选项' });
       expect(screen.queryByRole('menu', { name: '音效时长选项' })).toBeNull();
+      expect(within(optionPanel).queryAllByRole('menuitem')).toHaveLength(0);
+
+      // 浮层 portal 到 body，必须主动移焦，否则参数控件键盘不可达。
+      const automaticDuration = within(optionPanel).getByRole('checkbox', {
+        name: '自动时长',
+      });
+      expect(document.activeElement).toBe(automaticDuration);
+
+      fireEvent.keyDown(document, { key: 'Escape' });
+
+      expect(screen.queryByRole('group', { name: '音效时长选项' })).toBeNull();
+      expect(document.activeElement).toBe(trigger);
     });
   });
 
diff --git a/src/components/image-editor/ImageCanvasGenerationComposerView.tsx b/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
index 9c085bb8b..0086e4b35 100644
--- a/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
+++ b/src/components/image-editor/ImageCanvasGenerationComposerView.tsx
@@ -16,6 +16,7 @@ import {
   type RefObject,
   type SetStateAction,
   useCallback,
+  useEffect,
   useId,
   useRef,
   useState,
@@ -836,6 +837,7 @@ function ImageCanvasAudioGenerationComposerView({
 }) {
   const [isSoundOptionsOpen, setIsSoundOptionsOpen] = useState(false);
   const soundOptionsButtonRef = useRef<HTMLButtonElement | null>(null);
+  const soundAutoDurationRef = useRef<HTMLInputElement | null>(null);
   const soundModelButtonRef = useRef<HTMLButtonElement | null>(null);
   const promptCounterId = useId();
   const isSoundEffect = dialog.mode === 'audio-sound-effect';
@@ -845,8 +847,17 @@ function ImageCanvasAudioGenerationComposerView({
     isOpen: isSoundEffect && isSoundOptionsOpen,
     boundaryRefs: [soundOptionsButtonRef],
     onDismiss: () => setIsSoundOptionsOpen(false),
+    restoreFocusRef: soundOptionsButtonRef,
   });
 
+  useEffect(() => {
+    if (!isSoundEffect || !isSoundOptionsOpen) {
+      return;
+    }
+    // 浮层 portal 到 body，Tab 顺序离触发按钮很远；不主动移焦，复选框和滑块键盘不可达。
+    soundAutoDurationRef.current?.focus();
+  }, [isSoundEffect, isSoundOptionsOpen]);
+
   if (!isSoundEffect) {
     const backgroundMusicDialog = toBackgroundMusicGenerationDialog(dialog);
     const backgroundMusicPromptAssist = promptAssist;
@@ -1303,6 +1314,7 @@ function ImageCanvasAudioGenerationComposerView({
                 <PlatformFloatingMenu
                   className="image-canvas-editor__option-popover image-canvas-editor__option-popover--audio-options image-canvas-editor__portal-menu"
                   label="音效时长选项"
+                  variant="options"
                   placement="top-start"
                   style={buildPortalMenuStyle(
                     soundOptionsButtonRef.current,
@@ -1316,6 +1328,7 @@ function ImageCanvasAudioGenerationComposerView({
                       </span>
                       <label className="image-canvas-editor__sound-effect-auto-duration">
                         <input
+                          ref={soundAutoDurationRef}
                           type="checkbox"
                           aria-label="自动时长"
                           checked={isAutomaticDuration}
diff --git a/src/components/image-editor/useImageCanvasFloatingOptionDismiss.ts b/src/components/image-editor/useImageCanvasFloatingOptionDismiss.ts
index de8ba389c..7d7ff7ffc 100644
--- a/src/components/image-editor/useImageCanvasFloatingOptionDismiss.ts
+++ b/src/components/image-editor/useImageCanvasFloatingOptionDismiss.ts
@@ -8,6 +8,8 @@ type UseImageCanvasFloatingOptionDismissOptions = {
   isOpen: boolean;
   boundaryRefs: Array<FloatingOptionBoundaryRef | null | undefined>;
   onDismiss: () => void;
+  /** Escape 关闭后把焦点还给的触发按钮；不传则只关闭不移焦。 */
+  restoreFocusRef?: FloatingOptionBoundaryRef | null;
 };
 
 function isEventInsideBoundary(
@@ -35,6 +37,7 @@ export function useImageCanvasFloatingOptionDismiss({
   isOpen,
   boundaryRefs,
   onDismiss,
+  restoreFocusRef,
 }: UseImageCanvasFloatingOptionDismissOptions) {
   useEffect(() => {
     if (!isOpen || typeof document === 'undefined') {
@@ -52,9 +55,26 @@ export function useImageCanvasFloatingOptionDismiss({
       onDismiss();
     };
 
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (event.key !== 'Escape') {
+        return;
+      }
+      // 浮层 portal 到 body，关闭时焦点会掉到 body；只有焦点确实在浮层里才把它还给
+      // 触发按钮，避免抢走用户正在编辑的输入框。
+      const shouldRestoreFocus = isEventInsideFloatingMenu(
+        document.activeElement,
+      );
+      onDismiss();
+      if (shouldRestoreFocus) {
+        restoreFocusRef?.current?.focus();
+      }
+    };
+
     document.addEventListener('click', handleClick);
+    document.addEventListener('keydown', handleKeyDown);
     return () => {
       document.removeEventListener('click', handleClick);
+      document.removeEventListener('keydown', handleKeyDown);
     };
-  }, [boundaryRefs, isOpen, onDismiss]);
+  }, [boundaryRefs, isOpen, onDismiss, restoreFocusRef]);
 }
diff --git a/vitest.config.ts b/vitest.config.ts
index 71b67da98..1563fc39c 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -54,6 +54,7 @@ export default defineConfig({
       'src/components/common/AutoGrowTextArea.test.tsx',
       'src/components/common/CreativeImageInputPanel.test.tsx',
       'src/components/common/PlatformDangerConfirmDialog.test.tsx',
+      'src/components/common/PlatformFloatingMenu.test.tsx',
       'src/components/common/PlatformImagePreviewModal.test.tsx',
       'src/components/common/PlatformReportDialog.test.tsx',
       'src/components/common/PlatformUtilityInfoModal.test.tsx',