diff --git a/src/composables/__tests__/useGlassOpticalRenderer.spec.ts b/src/composables/__tests__/useGlassOpticalRenderer.spec.ts
index 916e63ff..203c474e 100644
--- a/src/composables/__tests__/useGlassOpticalRenderer.spec.ts
+++ b/src/composables/__tests__/useGlassOpticalRenderer.spec.ts
@@ -92,6 +92,27 @@ class ResizeObserverMock {
   }
 }
 
+/** 提供可显式触发 DOM 变更回调的 MutationObserver 实现。 */
+class MutationObserverTriggerMock implements MutationObserver {
+  static instances: MutationObserverTriggerMock[] = []
+
+  constructor(private readonly callback: MutationCallback) {
+    MutationObserverTriggerMock.instances.push(this)
+  }
+
+  disconnect() {}
+
+  observe() {}
+
+  takeRecords() {
+    return []
+  }
+
+  trigger(records: MutationRecord[]) {
+    this.callback(records, this)
+  }
+}
+
 /** 创建带稳定视口边界的光学表面元素。 */
 function appendOpticalSurface(className: string, bounds: Pick<DOMRect, 'height' | 'width' | 'x' | 'y'>) {
   const surface = document.createElement('section')
@@ -170,6 +191,30 @@ function createRemovalRecord(target: Element, removedNodes: Element[]): Mutation
   }
 }
 
+/** 构造会改变光学表面资格的属性变更记录。 */
+function createAttributeRecord(target: Element): MutationRecord {
+  return {
+    addedNodes: Object.assign([], { item: () => null }) as unknown as NodeList,
+    attributeName: 'data-glass-optical-mode',
+    attributeNamespace: null,
+    nextSibling: null,
+    oldValue: null,
+    previousSibling: null,
+    removedNodes: Object.assign([], { item: () => null }) as unknown as NodeList,
+    target,
+    type: 'attributes',
+  }
+}
+
+/** 执行有限数量的排队帧，避免交互衰减帧让测试进入无界循环。 */
+function flushQueuedAnimationFrames(callbacks: Map<number, FrameRequestCallback>, passes = 8) {
+  for (let pass = 0; pass < passes && callbacks.size > 0; pass += 1) {
+    const queued = [...callbacks.values()]
+    callbacks.clear()
+    queued.forEach(callback => callback(performance.now() + pass * 16))
+  }
+}
+
 function dispatchTouchEvent(
   type: 'touchcancel' | 'touchend' | 'touchmove' | 'touchstart',
   touches: Array<{ clientX: number; clientY: number; identifier: number }>,
@@ -185,8 +230,12 @@ function dispatchTouchEvent(
   return event
 }
 
+let documentHasFocus = true
+
 beforeEach(() => {
   ResizeObserverMock.instances = []
+  MutationObserverTriggerMock.instances = []
+  documentHasFocus = true
   wallpaperToneMocks.load.mockReset()
   wallpaperToneMocks.load.mockResolvedValue({
     corsReady: false,
@@ -200,6 +249,7 @@ beforeEach(() => {
   wallpaperToneMocks.takeDecodedSource.mockReturnValue(undefined)
   vi.stubGlobal('ResizeObserver', ResizeObserverMock)
   vi.stubGlobal('WebGLRenderingContext', class {})
+  vi.spyOn(document, 'hasFocus').mockImplementation(() => documentHasFocus)
   vi.spyOn(HTMLCanvasElement.prototype, 'getContext').mockReturnValue(null)
 })
 
@@ -1344,6 +1394,48 @@ describe('glass optical surface discovery', () => {
     scope.stop()
   })
 
+  it('keeps stable texture sampling lazy and limits diffuse taps to non-prefiltered frosted output', async () => {
+    const three = await import('three')
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render')
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(document.createElement('canvas')),
+        quality: ref('high'),
+        routeKey: ref('/dashboard'),
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    const scene = render.mock.calls
+      .map(call => call[0] as unknown as { children: Array<{ material?: ShaderMaterial }> })
+      .find(candidate => candidate.children[0]?.material?.uniforms.uTextureMix)
+    if (!scene) throw new Error('main optical scene was not rendered')
+    const material = scene.children[0].material!
+    const shader = material.fragmentShader
+    const previousToneIndex = shader.indexOf('toneMapWallpaper(previous, viewportUv, uPreviousWallpaperExposure)')
+    const currentToneIndex = shader.indexOf('toneMapWallpaper(current, viewportUv, uWallpaperExposure)')
+    const mixIndex = shader.indexOf('return mix(previousTone, currentTone, uTextureMix)')
+    const diffuseStart = shader.indexOf('if (frosted > 0.5 && usesPrefilteredFrost <= 0.5)')
+
+    expect(shader).toContain('bool needsPrevious = uTextureMix < 0.999')
+    expect(shader).toContain('bool needsCurrent = uTextureMix > 0.001')
+    expect(shader).toContain('if (needsPrevious)')
+    expect(shader).toContain('if (needsCurrent)')
+    expect(previousToneIndex).toBeGreaterThanOrEqual(0)
+    expect(currentToneIndex).toBeGreaterThan(previousToneIndex)
+    expect(mixIndex).toBeGreaterThan(currentToneIndex)
+    expect(diffuseStart).toBeGreaterThanOrEqual(0)
+    expect(shader.indexOf('sampleHighQualityDiffuse', diffuseStart)).toBeGreaterThan(diffuseStart)
+    expect(shader.indexOf('sampleBalancedDiffuse', diffuseStart)).toBeGreaterThan(diffuseStart)
+    expect(material.uniforms.uQuality.value).toBe(1)
+    scope.stop()
+  })
+
   it('retains a prepared transaction until it becomes the rendered active wallpaper', async () => {
     const three = await import('three')
     const wallpaperUrl = ref('https://example.com/wallpaper-1.jpg')
@@ -2768,6 +2860,7 @@ describe('glass optical surface discovery', () => {
 
     await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
     const dispose = vi.spyOn(three.WebGLRenderer.prototype, 'dispose')
+    const contextLoss = vi.spyOn(three.WebGLRenderer.prototype, 'forceContextLoss')
     const render = vi.spyOn(three.WebGLRenderer.prototype, 'render')
     vi.useFakeTimers()
 
@@ -2775,12 +2868,46 @@ describe('glass optical surface discovery', () => {
     document.dispatchEvent(new Event('visibilitychange'))
     await vi.advanceTimersByTimeAsync(APP_ACTIVITY_SUSPEND_DELAY_MS - 1)
     expect(dispose).not.toHaveBeenCalled()
+    expect(contextLoss).not.toHaveBeenCalled()
 
     visibilityState = 'visible'
     window.dispatchEvent(new Event('focus'))
     await nextTick()
     await Promise.resolve()
     expect(dispose).not.toHaveBeenCalled()
+    expect(contextLoss).not.toHaveBeenCalled()
+    expect(render).toHaveBeenCalled()
+    scope.stop()
+  })
+
+  it('keeps an initially unfocused visible renderer ready without drawing until focus resumes it', async () => {
+    const three = await import('three')
+    const canvas = document.createElement('canvas')
+    const visibilityState: DocumentVisibilityState = 'visible'
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+    documentHasFocus = false
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render')
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(canvas),
+        quality: ref('balanced'),
+        routeKey: ref('/dashboard'),
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    expect(render).not.toHaveBeenCalled()
+
+    documentHasFocus = true
+    window.dispatchEvent(new Event('focus'))
+    await nextTick()
+    await Promise.resolve()
+
     expect(render).toHaveBeenCalled()
     scope.stop()
   })
@@ -2904,6 +3031,413 @@ describe('glass optical surface discovery', () => {
     scope.stop()
   })
 
+  it.each(['blur', 'hidden'] as const)(
+    'blocks render, interaction, geometry, and scroll work after a real %s pause',
+    async pauseEvent => {
+      const three = await import('three')
+      const canvas = document.createElement('canvas')
+      const surface = appendOpticalSurface('app-hover-lift-card', { height: 320, width: 520, x: 40, y: 80 })
+      const root = document.createElement('div')
+      root.append(canvas)
+      Object.defineProperty(root, 'scrollHeight', { configurable: true, value: 1200 })
+      document.body.append(root)
+      let visibilityState: DocumentVisibilityState = 'visible'
+      vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+      vi.stubGlobal('MutationObserver', MutationObserverTriggerMock)
+      const callbacks = new Map<number, FrameRequestCallback>()
+      let frameId = 0
+      vi.spyOn(window, 'requestAnimationFrame').mockImplementation(callback => {
+        frameId += 1
+        callbacks.set(frameId, callback)
+        return frameId
+      })
+      vi.spyOn(window, 'cancelAnimationFrame').mockImplementation(id => callbacks.delete(id))
+      const render = vi.spyOn(three.WebGLRenderer.prototype, 'render')
+      const reflectionStrength = ref(40)
+      const motionRevision = ref(0)
+      const scope = effectScope()
+      const renderer = scope.run(() =>
+        useGlassOpticalRenderer({
+          active: ref(true),
+          appearance: ref('clear'),
+          canvas: ref(canvas),
+          dynamicsMode: ref<'fluid' | 'off' | 'ripple'>('fluid'),
+          pageMotion: {
+            acknowledgeGeometryReady: vi.fn(() => true),
+            active: ref(false),
+            epoch: ref(1),
+            opacity: ref(1),
+            revision: motionRevision,
+          },
+          quality: ref('balanced'),
+          routeKey: ref('/dashboard'),
+          reflectionStrength,
+          surfaceSpace: 'scroll',
+          tintColor: ref('#8D51F9'),
+          wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+        }),
+      )
+
+      await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+      flushQueuedAnimationFrames(callbacks)
+      render.mockClear()
+      callbacks.clear()
+      const framesBeforePause = renderer?.renderedFrames.value
+
+      if (pauseEvent === 'blur') {
+        documentHasFocus = false
+        window.dispatchEvent(new Event('blur'))
+      } else {
+        visibilityState = 'hidden'
+        document.dispatchEvent(new Event('visibilitychange'))
+      }
+
+      expect(callbacks.size).toBe(0)
+
+      setOpticalSurfaceBounds(surface, { height: 360, width: 560, x: 220, y: 180 })
+      reflectionStrength.value = 100
+      motionRevision.value += 1
+      ResizeObserverMock.instances.forEach(observer => observer.trigger())
+      MutationObserverTriggerMock.instances[0]?.trigger([createAttributeRecord(surface)])
+      window.dispatchEvent(new MouseEvent('pointermove', { clientX: 280, clientY: 240 }))
+      window.dispatchEvent(new Event('scroll'))
+      await nextTick()
+
+      expect(render).not.toHaveBeenCalled()
+      expect(renderer?.renderedFrames.value).toBe(framesBeforePause)
+      expect(callbacks.size).toBe(0)
+      scope.stop()
+    },
+  )
+
+  it('restores the latest uniform and scroll geometry after a paused resume', async () => {
+    const three = await import('three')
+    const canvas = document.createElement('canvas')
+    const root = document.createElement('div')
+    root.append(canvas)
+    Object.defineProperty(root, 'scrollHeight', { configurable: true, value: 1200 })
+    Object.defineProperty(root, 'scrollWidth', { configurable: true, value: 1200 })
+    document.body.append(root)
+    const surface = appendOpticalSurface('app-hover-lift-card', { height: 320, width: 520, x: 40, y: 80 })
+    let visibilityState: DocumentVisibilityState = 'visible'
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+    const callbacks = new Map<number, FrameRequestCallback>()
+    let frameId = 0
+    vi.spyOn(window, 'requestAnimationFrame').mockImplementation(callback => {
+      frameId += 1
+      callbacks.set(frameId, callback)
+      return frameId
+    })
+    vi.spyOn(window, 'cancelAnimationFrame').mockImplementation(id => callbacks.delete(id))
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render')
+    const reflectionStrength = ref(40)
+    const motionRevision = ref(0)
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(canvas),
+        dynamicsMode: ref<'fluid' | 'off' | 'ripple'>('off'),
+        pageMotion: {
+          acknowledgeGeometryReady: vi.fn(() => true),
+          active: ref(false),
+          epoch: ref(1),
+          opacity: ref(1),
+          revision: motionRevision,
+        },
+        quality: ref('balanced'),
+        reflectionStrength,
+        routeKey: ref('/dashboard'),
+        surfaceSpace: 'scroll',
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    flushQueuedAnimationFrames(callbacks)
+    const scene = render.mock.calls
+      .map(call => call[0] as unknown as { children: Array<{ material?: ShaderMaterial }> })
+      .find(candidate => candidate.children[0]?.material?.uniforms.uRects)
+    if (!scene) throw new Error('main optical scene was not rendered')
+    const uniforms = scene.children[0].material!.uniforms
+    render.mockClear()
+    callbacks.clear()
+
+    visibilityState = 'hidden'
+    document.dispatchEvent(new Event('visibilitychange'))
+    setOpticalSurfaceBounds(surface, { height: 360, width: 560, x: 220, y: 180 })
+    reflectionStrength.value = 100
+    motionRevision.value += 1
+    ResizeObserverMock.instances.forEach(observer => observer.trigger())
+    await nextTick()
+
+    expect(render).not.toHaveBeenCalled()
+    expect(callbacks.size).toBe(0)
+
+    visibilityState = 'visible'
+    document.dispatchEvent(new Event('visibilitychange'))
+    window.dispatchEvent(new Event('focus'))
+    window.dispatchEvent(new Event('pageshow'))
+    await nextTick()
+    await Promise.resolve()
+
+    expect(render).toHaveBeenCalledTimes(1)
+    expect(uniforms.uReflectionStrength.value).toBeGreaterThan(1)
+    expect(uniforms.uRects.value[0].x).toBeCloseTo(220 / 1200)
+    expect(uniforms.uRects.value[0].y).toBeCloseTo(1 - (180 + 360) / 1200)
+    scope.stop()
+  })
+
+  it('cancels a pending resume when blur arrives before nextTick and resumes on the next focus', async () => {
+    const three = await import('three')
+    const canvas = document.createElement('canvas')
+    let visibilityState: DocumentVisibilityState = 'visible'
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render')
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(canvas),
+        quality: ref('balanced'),
+        routeKey: ref('/dashboard'),
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    render.mockClear()
+    visibilityState = 'hidden'
+    document.dispatchEvent(new Event('visibilitychange'))
+    visibilityState = 'visible'
+    document.dispatchEvent(new Event('visibilitychange'))
+    documentHasFocus = false
+    window.dispatchEvent(new Event('blur'))
+    await nextTick()
+    await Promise.resolve()
+
+    expect(render).not.toHaveBeenCalled()
+
+    documentHasFocus = true
+    window.dispatchEvent(new Event('focus'))
+    await nextTick()
+    await Promise.resolve()
+    expect(render).toHaveBeenCalledTimes(1)
+    scope.stop()
+  })
+
+  it('keeps hidden-to-visible rendering paused without focus until an explicit focus event', async () => {
+    const three = await import('three')
+    const canvas = document.createElement('canvas')
+    let visibilityState: DocumentVisibilityState = 'visible'
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render')
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(canvas),
+        quality: ref('balanced'),
+        routeKey: ref('/dashboard'),
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    render.mockClear()
+    visibilityState = 'hidden'
+    document.dispatchEvent(new Event('visibilitychange'))
+    documentHasFocus = false
+    visibilityState = 'visible'
+    document.dispatchEvent(new Event('visibilitychange'))
+    window.dispatchEvent(new Event('pageshow'))
+    await nextTick()
+    await Promise.resolve()
+
+    expect(render).not.toHaveBeenCalled()
+
+    documentHasFocus = true
+    window.dispatchEvent(new Event('focus'))
+    await nextTick()
+    await Promise.resolve()
+    expect(render).toHaveBeenCalledTimes(1)
+    scope.stop()
+  })
+
+  it('commits correct native-scroll pixels before releasing the takeover on resume', async () => {
+    const three = await import('three')
+    const canvas = document.createElement('canvas')
+    const root = document.createElement('div')
+    root.append(canvas)
+    Object.defineProperty(root, 'scrollHeight', { configurable: true, value: 1200 })
+    document.body.append(root)
+    appendOpticalSurface('app-hover-lift-card', { height: 320, width: 520, x: 40, y: 80 })
+    let visibilityState: DocumentVisibilityState = 'visible'
+    let scrollY = 0
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+    vi.spyOn(window, 'scrollY', 'get').mockImplementation(() => scrollY)
+    const callbacks = new Map<number, FrameRequestCallback>()
+    let frameId = 0
+    vi.spyOn(window, 'requestAnimationFrame').mockImplementation(callback => {
+      frameId += 1
+      callbacks.set(frameId, callback)
+      return frameId
+    })
+    vi.spyOn(window, 'cancelAnimationFrame').mockImplementation(id => callbacks.delete(id))
+    const snapshots: Array<{ hasWallpaper: number; nativePresentation: string | undefined; scrollOffset: number }> = []
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render').mockImplementation(scene => {
+      const material = (scene as unknown as { children: Array<{ material?: ShaderMaterial }> }).children[0]?.material
+      const uniforms = material?.uniforms as
+        { uHasWallpaperTexture?: { value: number }; uScrollOffset?: { value: { y: number } } } | undefined
+      if (uniforms?.uHasWallpaperTexture && uniforms.uScrollOffset) {
+        snapshots.push({
+          hasWallpaper: uniforms.uHasWallpaperTexture.value,
+          nativePresentation: document.documentElement.dataset.glassScrollPresentation,
+          scrollOffset: uniforms.uScrollOffset.value.y,
+        })
+      }
+    })
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(canvas),
+        dynamicsMode: ref<'fluid' | 'off' | 'ripple'>('off'),
+        quality: ref('balanced'),
+        routeKey: ref('/dashboard'),
+        surfaceSpace: 'scroll',
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    flushQueuedAnimationFrames(callbacks)
+    const scene = render.mock.calls.at(-1)?.[0] as unknown as {
+      children: Array<{
+        material: { uniforms: { uHasWallpaperTexture: { value: number }; uScrollOffset: { value: { y: number } } } }
+      }>
+    }
+    const uniforms = scene.children[0].material.uniforms
+    snapshots.length = 0
+    render.mockClear()
+
+    scrollY = 240
+    window.dispatchEvent(new Event('scroll'))
+    expect(document.documentElement.dataset.glassScrollPresentation).toBe('native')
+    expect(uniforms.uHasWallpaperTexture.value).toBe(0)
+    const firstScrollFrame = [...callbacks.values()][0]
+    callbacks.clear()
+    firstScrollFrame?.(performance.now() + 16)
+    expect(uniforms.uScrollOffset.value.y).toBe(240)
+
+    visibilityState = 'hidden'
+    document.dispatchEvent(new Event('visibilitychange'))
+    expect(callbacks.size).toBe(0)
+    expect(document.documentElement.dataset.glassScrollPresentation).toBe('native')
+    expect(uniforms.uHasWallpaperTexture.value).toBe(0)
+
+    scrollY = 480
+    window.dispatchEvent(new Event('scroll'))
+    expect(uniforms.uScrollOffset.value.y).toBe(240)
+
+    visibilityState = 'visible'
+    document.dispatchEvent(new Event('visibilitychange'))
+    await nextTick()
+    await Promise.resolve()
+
+    expect(snapshots).toEqual([{ hasWallpaper: 1, nativePresentation: 'native', scrollOffset: 480 }])
+    expect(document.documentElement.dataset.glassScrollPresentation).toBeUndefined()
+    expect(uniforms.uHasWallpaperTexture.value).toBe(1)
+    scope.stop()
+  })
+
+  it('waits for page-motion geometry acknowledgement after a paused resume', async () => {
+    const three = await import('three')
+    const canvas = document.createElement('canvas')
+    const root = document.createElement('div')
+    root.append(canvas)
+    Object.defineProperty(root, 'scrollHeight', { configurable: true, value: 1200 })
+    document.body.append(root)
+    appendOpticalSurface('app-hover-lift-card', { height: 320, width: 520, x: 40, y: 80 })
+    let visibilityState: DocumentVisibilityState = 'visible'
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+    const callbacks = new Map<number, FrameRequestCallback>()
+    let frameId = 0
+    vi.spyOn(window, 'requestAnimationFrame').mockImplementation(callback => {
+      frameId += 1
+      callbacks.set(frameId, callback)
+      return frameId
+    })
+    vi.spyOn(window, 'cancelAnimationFrame').mockImplementation(id => callbacks.delete(id))
+    const acknowledgeGeometryReady = vi.fn(() => true)
+    const motionActive = ref(false)
+    const motionEpoch = ref(0)
+    const motionRevision = ref(0)
+    const committedWeights: number[] = []
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render').mockImplementation(scene => {
+      const material = (scene as unknown as { children: Array<{ material?: ShaderMaterial }> }).children[0]?.material
+      const weights = material?.uniforms.uSurfaceWeights?.value as number[] | undefined
+      if (weights) committedWeights.push(weights[0])
+    })
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(canvas),
+        dynamicsMode: ref<'fluid' | 'off' | 'ripple'>('off'),
+        pageMotion: {
+          acknowledgeGeometryReady,
+          active: motionActive,
+          epoch: motionEpoch,
+          opacity: ref(1),
+          revision: motionRevision,
+        },
+        quality: ref('balanced'),
+        routeKey: ref('/dashboard'),
+        surfaceSpace: 'scroll',
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    flushQueuedAnimationFrames(callbacks)
+    committedWeights.length = 0
+    render.mockClear()
+    callbacks.clear()
+
+    motionEpoch.value = 7
+    motionActive.value = true
+    expect(callbacks.size).toBe(1)
+    visibilityState = 'hidden'
+    document.dispatchEvent(new Event('visibilitychange'))
+    expect(callbacks.size).toBe(0)
+    expect(acknowledgeGeometryReady).not.toHaveBeenCalled()
+
+    visibilityState = 'visible'
+    document.dispatchEvent(new Event('visibilitychange'))
+    await nextTick()
+    await Promise.resolve()
+
+    expect(acknowledgeGeometryReady).not.toHaveBeenCalled()
+    expect(committedWeights[0]).toBe(0)
+    flushQueuedAnimationFrames(callbacks, 6)
+
+    expect(acknowledgeGeometryReady).toHaveBeenCalledOnce()
+    expect(acknowledgeGeometryReady).toHaveBeenCalledWith(7, expect.any(Number))
+    expect(committedWeights.at(-1)).toBe(1)
+    scope.stop()
+  })
+
   it('releases renderer resources after the long background timeout', async () => {
     const three = await import('three')
     const canvas = document.createElement('canvas')
@@ -2945,11 +3479,100 @@ describe('glass optical surface discovery', () => {
     scope.stop()
   })
 
+  it('rebuilds long-background resources and acknowledges the latest page-motion epoch', async () => {
+    const three = await import('three')
+    const canvas = document.createElement('canvas')
+    const root = document.createElement('div')
+    root.append(canvas)
+    Object.defineProperty(root, 'scrollHeight', { configurable: true, value: 1200 })
+    document.body.append(root)
+    appendOpticalSurface('app-hover-lift-card', { height: 320, width: 520, x: 40, y: 80 })
+    let visibilityState: DocumentVisibilityState = 'visible'
+    vi.spyOn(document, 'visibilityState', 'get').mockImplementation(() => visibilityState)
+    const callbacks = new Map<number, FrameRequestCallback>()
+    let frameId = 0
+    vi.spyOn(window, 'requestAnimationFrame').mockImplementation(callback => {
+      frameId += 1
+      callbacks.set(frameId, callback)
+      return frameId
+    })
+    vi.spyOn(window, 'cancelAnimationFrame').mockImplementation(id => callbacks.delete(id))
+    const acknowledgeGeometryReady = vi.fn()
+    const committedWeights: number[] = []
+    const render = vi.spyOn(three.WebGLRenderer.prototype, 'render').mockImplementation(scene => {
+      const material = (scene as unknown as { children: Array<{ material?: ShaderMaterial }> }).children[0]?.material
+      const weights = material?.uniforms.uSurfaceWeights?.value as number[] | undefined
+      if (weights) committedWeights.push(weights[0])
+    })
+    const motionActive = ref(false)
+    const motionEpoch = ref(0)
+    const scope = effectScope()
+    const renderer = scope.run(() =>
+      useGlassOpticalRenderer({
+        active: ref(true),
+        appearance: ref('clear'),
+        canvas: ref(canvas),
+        dynamicsMode: ref<'fluid' | 'off' | 'ripple'>('off'),
+        pageMotion: {
+          acknowledgeGeometryReady,
+          active: motionActive,
+          epoch: motionEpoch,
+          opacity: ref(1),
+          revision: ref(0),
+        },
+        quality: ref('balanced'),
+        routeKey: ref('/dashboard'),
+        surfaceSpace: 'scroll',
+        tintColor: ref('#8D51F9'),
+        wallpaperUrl: ref('https://example.com/wallpaper.jpg'),
+      }),
+    )
+
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+    flushQueuedAnimationFrames(callbacks)
+    committedWeights.length = 0
+    render.mockClear()
+    callbacks.clear()
+
+    motionEpoch.value = 11
+    motionActive.value = true
+    motionEpoch.value = 12
+    expect(callbacks.size).toBe(1)
+
+    const dispose = vi.spyOn(three.WebGLRenderer.prototype, 'dispose')
+    const contextLoss = vi.spyOn(three.WebGLRenderer.prototype, 'forceContextLoss')
+    vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout'] })
+    visibilityState = 'hidden'
+    document.dispatchEvent(new Event('visibilitychange'))
+    expect(callbacks.size).toBe(0)
+
+    await vi.advanceTimersByTimeAsync(APP_ACTIVITY_SUSPEND_DELAY_MS)
+    expect(dispose).toHaveBeenCalledTimes(1)
+    expect(contextLoss).not.toHaveBeenCalled()
+    expect(acknowledgeGeometryReady).not.toHaveBeenCalled()
+
+    visibilityState = 'visible'
+    document.dispatchEvent(new Event('visibilitychange'))
+    window.dispatchEvent(new Event('focus'))
+    await nextTick()
+    await vi.waitFor(() => expect(renderer?.state.value).toBe('ready'))
+
+    expect(acknowledgeGeometryReady).not.toHaveBeenCalled()
+    expect(callbacks.size).toBeGreaterThan(0)
+    flushQueuedAnimationFrames(callbacks, 8)
+
+    expect(acknowledgeGeometryReady).toHaveBeenCalledOnce()
+    expect(acknowledgeGeometryReady).toHaveBeenCalledWith(12, expect.any(Number))
+    expect(committedWeights).toContain(0)
+    expect(committedWeights.at(-1)).toBe(1)
+    scope.stop()
+  })
+
   it('releases a paused renderer after the visible window remains unfocused', async () => {
     const three = await import('three')
     const canvas = document.createElement('canvas')
     vi.spyOn(document, 'visibilityState', 'get').mockReturnValue('visible')
-    vi.spyOn(document, 'hasFocus').mockReturnValue(false)
+    documentHasFocus = false
     const scope = effectScope()
     const renderer = scope.run(() =>
       useGlassOpticalRenderer({
diff --git a/src/composables/useGlassOpticalRenderer.ts b/src/composables/useGlassOpticalRenderer.ts
index 72eac405..13ff1e47 100644
--- a/src/composables/useGlassOpticalRenderer.ts
+++ b/src/composables/useGlassOpticalRenderer.ts
@@ -707,27 +707,34 @@ vec3 toneMapWallpaper(vec3 color, vec2 uv, float wallpaperExposure) {
 vec3 sampleWallpaper(vec2 uv) {
   vec2 viewportUv = vec2(0.5) + (uv - vec2(0.5)) / max(uCoverScale, vec2(0.0001));
   vec2 previousUv = vec2(0.5) + (viewportUv - vec2(0.5)) * uPreviousCoverScale;
-  vec3 previous;
-  vec3 current;
+  vec3 previous = vec3(0.0);
+  vec3 current = vec3(0.0);
+  // 稳定端点只读取参与输出的纹理；过渡中仍按各自曝光映射后混合。
+  bool needsPrevious = uTextureMix < 0.999;
+  bool needsCurrent = uTextureMix > 0.001;
   if (uAppearance > 1.5 && uHasFrostedTexture > 0.5) {
     float frostLod = (1.0 - uFrostDetailLevel) * 6.0;
     // 低分辨率预滤已经扩大了每个 texel 的原图 footprint，LOD 只追加当前纹理内的低通层级。
     float frostGradientScale = exp2(frostLod);
-    previous = texture2DGradEXT(
-      uPreviousFrostedTexture,
-      previousUv,
-      dFdx(previousUv) * frostGradientScale,
-      dFdy(previousUv) * frostGradientScale
-    ).rgb;
-    current = texture2DGradEXT(
-      uFrostedTexture,
-      uv,
-      dFdx(uv) * frostGradientScale,
-      dFdy(uv) * frostGradientScale
-    ).rgb;
+    if (needsPrevious) {
+      previous = texture2DGradEXT(
+        uPreviousFrostedTexture,
+        previousUv,
+        dFdx(previousUv) * frostGradientScale,
+        dFdy(previousUv) * frostGradientScale
+      ).rgb;
+    }
+    if (needsCurrent) {
+      current = texture2DGradEXT(
+        uFrostedTexture,
+        uv,
+        dFdx(uv) * frostGradientScale,
+        dFdy(uv) * frostGradientScale
+      ).rgb;
+    }
   } else {
-    previous = texture2D(uPreviousTexture, previousUv).rgb;
-    current = texture2D(uTexture, uv).rgb;
+    if (needsPrevious) previous = texture2D(uPreviousTexture, previousUv).rgb;
+    if (needsCurrent) current = texture2D(uTexture, uv).rgb;
   }
 
   if (uTextureMix <= 0.001) {
@@ -929,25 +936,23 @@ ${GLASS_FLUID_FRAGMENT_SURFACE_REFRACTION}
     ? refracted
     : sampleChromatic(sourceUv, detailSeparation);
   refracted = mix(refracted, detailed, mix(0.06, 0.16, uQuality) * (1.0 - frosted));
-  vec2 diffusionAxis = length(refraction) > 0.00001 ? normalize(refraction) : wakePerpendicular;
-  float diffusionRadius =
-    mix(0.0022, 0.0038, uQuality) *
-    (
-      0.82 +
-      materialEnergy * mix(0.28, 0.76, uMotionExpansion) +
-      flowSurfaceDetail * dynamicMask * 0.38
-    );
-  float frostedDensity = frosted * (1.0 - uFrostDetailLevel);
-  diffusionRadius *= 1.0 + frostedDensity * mix(1.15, 1.55, uQuality);
-  vec3 diffused;
-  if (usesPrefilteredFrost > 0.5) {
-    diffused = refracted;
-  } else if (uQuality > 0.5) {
-    diffused = sampleHighQualityDiffuse(sourceUv, diffusionAxis, diffusionRadius);
-  } else {
-    diffused = sampleBalancedDiffuse(sourceUv, diffusionAxis, diffusionRadius);
+  // 非磨砂不使用扩散结果；预滤磨砂已具备低通纹理，两者都无需额外邻域采样。
+  if (frosted > 0.5 && usesPrefilteredFrost <= 0.5) {
+    vec2 diffusionAxis = length(refraction) > 0.00001 ? normalize(refraction) : wakePerpendicular;
+    float diffusionRadius =
+      mix(0.0022, 0.0038, uQuality) *
+      (
+        0.82 +
+        materialEnergy * mix(0.28, 0.76, uMotionExpansion) +
+        flowSurfaceDetail * dynamicMask * 0.38
+      );
+    float frostedDensity = frosted * (1.0 - uFrostDetailLevel);
+    diffusionRadius *= 1.0 + frostedDensity * mix(1.15, 1.55, uQuality);
+    vec3 diffused = uQuality > 0.5
+      ? sampleHighQualityDiffuse(sourceUv, diffusionAxis, diffusionRadius)
+      : sampleBalancedDiffuse(sourceUv, diffusionAxis, diffusionRadius);
+    refracted = mix(refracted, diffused, frosted);
   }
-  refracted = mix(refracted, diffused, frosted);
   float refractedLuminance = dot(refracted, vec3(0.2126, 0.7152, 0.0722));
   float tinted = step(0.5, uAppearance) * (1.0 - step(1.5, uAppearance));
   float transmissionOffset = min(uTransmissionStrength - 1.0, 0.0);
@@ -1326,12 +1331,19 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   let contextRecoveryPending = false
   let resumePromise: Promise<void> | null = null
   let resumeVersion = 0
+  // 失焦后的暂停状态由活动事件解除，观察器与参数更新不能自行恢复呈现。
+  let presentationPaused = document.visibilityState === 'hidden' || !document.hasFocus()
   let dynamicsGeneration = 0
   const presentationSpace = options.surfaceSpace ?? 'fixed'
   const usesDynamicsOnly = () =>
     presentationSpace === 'scroll' || (presentationSpace === 'fixed' && toValue(options.appearance) === 'frosted')
   const wallpaperSourceCache = options.wallpaperSourceCache ?? createGlassWallpaperSourceCache()
 
+  /** 所有持续绘制入口共享活动边界，资源准备和 uniform 同步不依赖呈现帧。 */
+  function canPresentFrame() {
+    return toValue(options.active) && !presentationPaused && document.visibilityState !== 'hidden'
+  }
+
   /** 滚动期间由原生 backdrop 接管壁纸；稳定态恢复完整纹理折射与流体反馈。 */
   function syncWallpaperSamplingMode() {
     if (!resources) return
@@ -1347,18 +1359,18 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
     scrollPresentationRestoreTimer = null
   }
 
-  function finishNativeScrollPresentation(timestamp = performance.now()) {
+  function finishNativeScrollPresentation(timestamp = performance.now(), advanceFlow = false) {
     clearScrollPresentationRestoreTimer()
-    if (presentationSpace !== 'scroll' || !scrollWallpaperSamplingSuppressed) return
+    if (presentationSpace !== 'scroll' || !scrollWallpaperSamplingSuppressed || !canPresentFrame()) return
 
     scrollWallpaperSamplingSuppressed = false
     syncWallpaperSamplingMode()
-    renderFrame(timestamp, false)
+    renderFrame(timestamp, advanceFlow)
     document.documentElement.removeAttribute('data-glass-scroll-presentation')
   }
 
   function beginNativeScrollPresentation() {
-    if (presentationSpace !== 'scroll' || !resources) return
+    if (presentationSpace !== 'scroll' || !resources || !canPresentFrame()) return
 
     clearScrollPresentationRestoreTimer()
     scrollPresentationRestoreTimer = window.setTimeout(() => finishNativeScrollPresentation(), 180)
@@ -1532,6 +1544,18 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
     transformingSurfaces.clear()
   }
 
+  /** 暂停和销毁共用几何帧清理，恢复时按最新 DOM 重新测量。 */
+  function cancelSurfaceUpdateFrames() {
+    if (surfaceUpdateFrame !== null) cancelAnimationFrame(surfaceUpdateFrame)
+    surfaceUpdateFrame = null
+    if (surfaceStabilityFrame !== null) cancelAnimationFrame(surfaceStabilityFrame)
+    surfaceStabilityFrame = null
+    if (presentationResizeTimer !== null) window.clearTimeout(presentationResizeTimer)
+    presentationResizeTimer = null
+    presentationResizeCandidate = ''
+    presentationResizeStableSamples = 0
+  }
+
   function clearBackgroundDisposeTimer() {
     if (backgroundDisposeTimer === null) return
 
@@ -1584,7 +1608,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
 
   function renderWallpaperTransitionFrame(timestamp: number) {
     wallpaperTransitionFrame = null
-    if (document.visibilityState === 'hidden') return
+    if (!canPresentFrame()) return
 
     renderFrame(timestamp)
     if (previousTexture && wallpaperTransitionFrame === null) {
@@ -1593,7 +1617,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function scheduleWallpaperTransition() {
-    if (wallpaperTransitionFrame !== null || !previousTexture || document.visibilityState === 'hidden') return
+    if (wallpaperTransitionFrame !== null || !previousTexture || !canPresentFrame()) return
 
     wallpaperTransitionFrame = requestAnimationFrame(renderWallpaperTransitionFrame)
   }
@@ -1821,7 +1845,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function renderFrame(timestamp = performance.now(), advanceFlow = true) {
-    if (!resources || !toValue(options.active) || document.visibilityState === 'hidden') return
+    if (!resources || !canPresentFrame()) return
 
     updateWallpaperTransition(timestamp)
     if (fluidDynamics && advanceFlow) {
@@ -1859,7 +1883,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function scheduleFrame() {
-    if (animationFrame !== null || !resources) return
+    if (animationFrame !== null || !resources || !canPresentFrame()) return
 
     animationFrame = requestAnimationFrame(renderScheduledFrame)
   }
@@ -2141,11 +2165,13 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function scheduleSurfaceUpdate() {
+    if (!canPresentFrame()) return
     if (queueScrollGeometryRefresh(false)) return
     if (surfaceUpdateFrame !== null || !resources) return
 
     surfaceUpdateFrame = requestAnimationFrame(timestamp => {
       surfaceUpdateFrame = null
+      if (!canPresentFrame()) return
       updateSurfaceUniforms(timestamp, false)
       // 表面失效必须在同一有界帧内清除旧像素，不能等待下一次指针或壁纸事件。
       renderFrame(timestamp, false)
@@ -2155,6 +2181,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   /** DOM 重排后连续采样少量帧，避免把虚拟列表的中间几何误认为最终表面。 */
   function scheduleSurfaceStabilityUpdate(motionEpoch?: number) {
     if (motionEpoch !== undefined) pagePresentationMotionEpoch = motionEpoch
+    if (!canPresentFrame()) return
     if (queueScrollGeometryRefresh(true)) return
     surfaceStabilityPass = 0
     surfaceStableFrameCount = 0
@@ -2163,7 +2190,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
 
     const sample = (timestamp: number) => {
       surfaceStabilityFrame = null
-      if (!resources || !toValue(options.active) || document.visibilityState === 'hidden') return
+      if (!resources || !canPresentFrame()) return
 
       updateSurfaceUniforms(timestamp, false)
       const signature = surfaceSlots
@@ -2203,13 +2230,14 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
    * 连续两个 80ms 样本一致才允许覆盖已提交的 presentation 首帧。
    */
   function schedulePresentationResizeUpdate() {
+    if (!canPresentFrame()) return
     if (presentationResizeTimer !== null) window.clearTimeout(presentationResizeTimer)
     presentationResizeCandidate = ''
     presentationResizeStableSamples = 0
 
     const sample = () => {
       presentationResizeTimer = null
-      if (!resources) return
+      if (!resources || !canPresentFrame()) return
 
       const presentation = measurePresentationSize()
       const candidate = `${window.innerWidth},${window.innerHeight},${presentation.width},${presentation.height}`
@@ -2231,7 +2259,13 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
 
   /** 共享页面 motion 活跃时，页面几何变化必须在浏览器绘制前完成一次完整 presentation 提交。 */
   function commitActivePagePresentation(timestamp = performance.now()) {
-    if (!resources || presentationSpace !== 'scroll' || !toValue(options.pageMotion?.active ?? false)) return false
+    if (
+      !resources ||
+      !canPresentFrame() ||
+      presentationSpace !== 'scroll' ||
+      !toValue(options.pageMotion?.active ?? false)
+    )
+      return false
 
     if (presentationResizeTimer !== null) window.clearTimeout(presentationResizeTimer)
     presentationResizeTimer = null
@@ -2246,7 +2280,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
 
   /** 普通表面尺寸即时更新；页面根尺寸在稳定后覆盖 presentation。 */
   function handleSurfaceResize(entries: ResizeObserverEntry[]) {
-    if (!resources) return
+    if (!resources || !canPresentFrame()) return
 
     const presentationRoot = presentationSpace === 'scroll' ? options.canvas.value?.parentElement : null
     const presentationChanged = presentationRoot && entries.some(entry => entry.target === presentationRoot)
@@ -2262,12 +2296,13 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
 
   /** CSS transform 不改变布局尺寸，过渡期间用有界帧同步真实几何并清除旧蒙版。 */
   function scheduleSurfaceTransformFrame() {
+    if (!canPresentFrame()) return
     if (queueScrollGeometryRefresh(false)) return
     if (surfaceTransformFrame !== null || !resources) return
 
     surfaceTransformFrame = requestAnimationFrame(timestamp => {
       surfaceTransformFrame = null
-      if (!resources || !toValue(options.active) || document.visibilityState === 'hidden') {
+      if (!resources || !canPresentFrame()) {
         cancelSurfaceTransformFrame()
         return
       }
@@ -2455,7 +2490,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function resizeRenderer() {
-    if (!resources) return
+    if (!resources || !canPresentFrame()) return
 
     const viewportWidth = window.innerWidth
     const viewportHeight = window.innerHeight
@@ -2660,7 +2695,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function renderInteractionFrame(timestamp: number) {
-    if (!resources || !toValue(options.active) || document.visibilityState === 'hidden') {
+    if (!resources || !canPresentFrame()) {
       animationFrame = null
       interactionAnimating = false
       return
@@ -2725,7 +2760,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function startInteractionAnimation() {
-    if (interactionAnimating) return
+    if (interactionAnimating || !canPresentFrame()) return
 
     cancelScheduledFrame()
     interactionAnimating = true
@@ -2742,6 +2777,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
     target?: EventTarget | null,
   ) {
     if (
+      !canPresentFrame() ||
       !hasDynamicCapability() ||
       (hasRippleCapability() && presentationSpace === 'scroll' && scrollWallpaperSamplingSuppressed)
     ) {
@@ -2940,12 +2976,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
     scrollAnimationFrame = null
     scrollFrameCommitted = false
     scrollLateGeometryCommitted = false
-    if (
-      presentationSpace !== 'scroll' ||
-      !resources ||
-      !toValue(options.active) ||
-      document.visibilityState === 'hidden'
-    ) {
+    if (presentationSpace !== 'scroll' || !resources || !canPresentFrame()) {
       scrollDirty = false
       scrollStableFrameCount = 0
       return
@@ -2991,13 +3022,13 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function scheduleScrollFrame() {
-    if (scrollAnimationFrame !== null || presentationSpace !== 'scroll' || !resources) return
+    if (scrollAnimationFrame !== null || presentationSpace !== 'scroll' || !resources || !canPresentFrame()) return
 
     scrollAnimationFrame = requestAnimationFrame(renderScrollFrame)
   }
 
   function handleScroll(event: Event) {
-    if (presentationSpace !== 'scroll' || !resources) return
+    if (presentationSpace !== 'scroll' || !resources || !canPresentFrame()) return
 
     const target = event.target
     if (!isRelevantScrollTarget(target)) return
@@ -3034,7 +3065,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function handleScrollEnd(event: Event) {
-    if (presentationSpace !== 'scroll' || !resources) return
+    if (presentationSpace !== 'scroll' || !resources || !canPresentFrame()) return
 
     const target = event.target
     if (
@@ -3052,20 +3083,25 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
 
   /** 暂停事件驱动帧但保留 WebGL context、纹理、流场和最后一张稳定画面。 */
   function pauseRenderer() {
+    presentationPaused = true
+    resumeVersion += 1
+    resumePromise = null
     cancelScheduledFrame()
     cancelScrollFrame()
-    finishNativeScrollPresentation()
+    // 原生滚动背板保持接管，恢复时先提交正确像素再揭示 canvas。
     cancelWallpaperTransitionFrame()
     cancelSurfaceTransformFrame()
+    cancelSurfaceUpdateFrames()
     interactionAnimating = false
   }
 
   /** 合并同一可见性事务的多个浏览器事件，只恢复一次稳定帧。 */
   function resumeRenderer() {
+    if (!canPresentFrame()) return Promise.resolve()
     if (resumePromise) return resumePromise
 
     const version = resumeVersion
-    const canResume = () => toValue(options.active) && document.visibilityState !== 'hidden'
+    const canResume = () => canPresentFrame()
     const task = (async () => {
       clearBackgroundDisposeTimer()
       if (!canResume()) return
@@ -3074,6 +3110,7 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
       if (version !== resumeVersion || !canResume()) return
       if (!resources) {
         await initializeRenderer()
+        if (canPresentFrame() && !pagePresentationGeometryReady) scheduleSurfaceStabilityUpdate()
         return
       }
 
@@ -3082,12 +3119,14 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
       const timestamp = performance.now()
       const keepRippleAnimating = hasRippleCapability() ? advanceRipple(timestamp) : false
       if (!keepRippleAnimating) resetInteractionState()
-      renderFrame(timestamp, !hasRippleCapability())
+      if (scrollWallpaperSamplingSuppressed) finishNativeScrollPresentation(timestamp, !hasRippleCapability())
+      else renderFrame(timestamp, !hasRippleCapability())
       if (keepRippleAnimating) {
         interactionAnimating = true
         animationFrame = requestAnimationFrame(renderInteractionFrame)
       }
       scheduleWallpaperTransition()
+      if (!pagePresentationGeometryReady) scheduleSurfaceStabilityUpdate()
     })()
 
     resumePromise = task
@@ -3111,12 +3150,13 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
   }
 
   function handleVisibilityChange() {
-    if (document.visibilityState === 'hidden') {
+    if (document.visibilityState === 'hidden' || !document.hasFocus()) {
       pauseRenderer()
-      scheduleInactiveRendererDisposal(() => document.visibilityState === 'hidden')
+      scheduleInactiveRendererDisposal(() => document.visibilityState === 'hidden' || !document.hasFocus())
       return
     }
 
+    presentationPaused = false
     void resumeRenderer()
   }
 
@@ -3127,8 +3167,15 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
     scheduleInactiveRendererDisposal(() => document.visibilityState === 'visible' && !document.hasFocus())
   }
 
-  function handleWindowResume() {
-    if (document.visibilityState === 'visible') void resumeRenderer()
+  function handleWindowResume(event: Event) {
+    if (document.visibilityState !== 'visible') return
+    if (event.type === 'pageshow' && !document.hasFocus()) {
+      handleWindowBlur()
+      return
+    }
+
+    presentationPaused = false
+    void resumeRenderer()
   }
 
   function handleContextLost(event: Event) {
@@ -3350,21 +3397,8 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
     cancelScrollFrame()
     cancelWallpaperTransitionFrame()
     cancelSurfaceTransformFrame()
+    cancelSurfaceUpdateFrames()
     clearBackgroundDisposeTimer()
-    if (surfaceUpdateFrame !== null) {
-      cancelAnimationFrame(surfaceUpdateFrame)
-      surfaceUpdateFrame = null
-    }
-    if (surfaceStabilityFrame !== null) {
-      cancelAnimationFrame(surfaceStabilityFrame)
-      surfaceStabilityFrame = null
-    }
-    if (presentationResizeTimer !== null) {
-      window.clearTimeout(presentationResizeTimer)
-      presentationResizeTimer = null
-    }
-    presentationResizeCandidate = ''
-    presentationResizeStableSamples = 0
     removeEvents()
     resizeObserver?.disconnect()
     resizeObserver = null
@@ -3994,6 +4028,9 @@ export function useGlassOpticalRenderer(options: UseGlassOpticalRendererOptions)
       resizeRenderer()
       await loadWallpaper(toValue(options.wallpaperUrl), version)
       preparePendingWallpaper()
+      if (version === loadVersion && presentationPaused) {
+        scheduleInactiveRendererDisposal(() => document.visibilityState === 'hidden' || !document.hasFocus())
+      }
     } catch (error) {
       fallbackFromCurrentLoad(version, '玻璃光学渲染器初始化失败，已回退标准材质:', error)
     }