diff --git a/windows/CHANGELOG.md b/windows/CHANGELOG.md
index 416fcb8..98d5a70 100644
--- a/windows/CHANGELOG.md
+++ b/windows/CHANGELOG.md
@@ -4,12 +4,14 @@
 
 ### 新增
 
+- Windows 系统托盘新增「壁纸透出」滑杆；100% 时视频保持原始画面，整页主题蒙层降为零，并随当前主题持久化；拖动滑杆不会重新传输整段视频。
 - Windows 主题仓库与托盘支持本地 MP4/WebM 动态壁纸；视频静音循环、页面隐藏时暂停，并可像图片主题一样保存和切换。
 - 视频采用上限 128 MB、单块 512 KiB 的 CDP 分块传输，在 renderer 内组装为 Blob URL，避免把完整视频塞进 early bootstrap payload；换主题、暂停和清理时会释放播放器与 Blob URL。
 - MP4/WebM 导入会校验扩展名、最小容器签名、大小、受管目录边界和 reparse point，伪造扩展名或越界路径会在复制前拒绝。
 
 ### 修复
 
+- 浅色与深色外观现在都为原生应用菜单提供稳定的半透明可读性层，并强制菜单文字与图标使用完整主题前景色；动态视频模式还会单独保护第二层 Codex 工具栏，避免画面逐帧变化导致顶栏内容失去对比度。
 - 兼容新版 Codex 不再提供 `[role="main"]` 的任务页面：回退到 `main.main-surface` 承载任务背景，收起左侧边栏后也不会清除皮肤。
 - 任务页回退模式保留原生固定顶栏，并移除顶栏半透明底色与主区顶部渐隐造成的横向断层。
 - 托盘右键菜单允许从空的 `ToolStripItemCollection` 开始填充，避免首次展开时触发参数绑定异常。
diff --git a/windows/README.en.md b/windows/README.en.md
index dabb1f5..5fdddce 100644
--- a/windows/README.en.md
+++ b/windows/README.en.md
@@ -66,6 +66,7 @@ Next, use the generated screenshot to check horizontal overflow and text contras
 Open `Codex Dream Skin - Tray` to:
 
 - Import a PNG, JPEG, or WebP background, or an MP4/WebM animated wallpaper.
+- Adjust wallpaper reveal: at 100% the video stays at its original opacity while the full-window theme veil reaches zero; the value persists with the theme.
 - Save the active theme and switch through saved themes.
 - Pause or resume the skin.
 - Reapply the theme or fully restore Codex.
diff --git a/windows/README.md b/windows/README.md
index 7c0b6a7..f114c8b 100644
--- a/windows/README.md
+++ b/windows/README.md
@@ -66,6 +66,7 @@ powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\scripts\verify-dream-s
 打开 `Codex Dream Skin - Tray` 后可以：
 
 - 更换 PNG、JPEG、WebP 背景图，或 MP4、WebM 动态壁纸。
+- 使用「壁纸透出」滑杆调整覆盖在壁纸上的主题面板：100% 时视频保持原始画面，整页主题蒙层为零；设置会随主题持久化。
 - 保存当前主题并从「已保存主题」切换。
 - 暂停或继续显示皮肤。
 - 重新应用主题，或完整恢复 Codex。
diff --git a/windows/assets/dream-skin.css b/windows/assets/dream-skin.css
index 5a2f529..d3bad4f 100644
--- a/windows/assets/dream-skin.css
+++ b/windows/assets/dream-skin.css
@@ -15,17 +15,28 @@
   --dream-accent-hover: color-mix(in oklab, var(--dream-accent) 20%, var(--dream-surface));
   --dream-hero-shade: color-mix(in oklab, var(--dream-surface) 93%, transparent);
   --dream-ambient-opacity: .18;
+  --dream-wallpaper-reveal: 1;
+  --dream-wallpaper-cover: 0%;
+  --dream-media-overlay: color-mix(in oklab, var(--dream-canvas) var(--dream-wallpaper-cover), transparent);
   --dream-shadow: 0 16px 42px color-mix(in oklab, var(--dream-accent) 9%, transparent);
-  --dream-immersive-edge: color-mix(in oklab, var(--dream-surface) 46%, transparent);
-  --dream-immersive-mid: color-mix(in oklab, var(--dream-surface) 28%, transparent);
-  --dream-immersive-far: color-mix(in oklab, var(--dream-surface) 14%, transparent);
-  --dream-immersive-sidebar: color-mix(in oklab, var(--dream-sidebar) 50%, transparent);
-  --dream-task-immersive-sidebar: color-mix(in oklab, var(--dream-sidebar) 72%, transparent);
+  --dream-immersive-edge-base: color-mix(in oklab, var(--dream-surface) 46%, transparent);
+  --dream-immersive-mid-base: color-mix(in oklab, var(--dream-surface) 28%, transparent);
+  --dream-immersive-far-base: color-mix(in oklab, var(--dream-surface) 14%, transparent);
+  --dream-immersive-sidebar-base: color-mix(in oklab, var(--dream-sidebar) 50%, transparent);
+  --dream-task-immersive-sidebar-base: color-mix(in oklab, var(--dream-sidebar) 72%, transparent);
+  --dream-task-immersive-edge-base: color-mix(in oklab, var(--dream-surface) 86%, transparent);
+  --dream-task-immersive-mid-base: color-mix(in oklab, var(--dream-surface) 78%, transparent);
+  --dream-task-immersive-far-base: color-mix(in oklab, var(--dream-surface) 66%, transparent);
+  --dream-immersive-edge: color-mix(in oklab, var(--dream-immersive-edge-base) var(--dream-wallpaper-cover), transparent);
+  --dream-immersive-mid: color-mix(in oklab, var(--dream-immersive-mid-base) var(--dream-wallpaper-cover), transparent);
+  --dream-immersive-far: color-mix(in oklab, var(--dream-immersive-far-base) var(--dream-wallpaper-cover), transparent);
+  --dream-immersive-sidebar: color-mix(in oklab, var(--dream-immersive-sidebar-base) var(--dream-wallpaper-cover), transparent);
+  --dream-task-immersive-sidebar: color-mix(in oklab, var(--dream-task-immersive-sidebar-base) var(--dream-wallpaper-cover), transparent);
+  --dream-task-immersive-edge: color-mix(in oklab, var(--dream-task-immersive-edge-base) var(--dream-wallpaper-cover), transparent);
+  --dream-task-immersive-mid: color-mix(in oklab, var(--dream-task-immersive-mid-base) var(--dream-wallpaper-cover), transparent);
+  --dream-task-immersive-far: color-mix(in oklab, var(--dream-task-immersive-far-base) var(--dream-wallpaper-cover), transparent);
   --dream-immersive-composer: color-mix(in oklab, var(--dream-surface-raised) 76%, var(--dream-accent) 4%);
   --dream-immersive-line: color-mix(in oklab, var(--dream-line) 76%, transparent);
-  --dream-task-immersive-edge: color-mix(in oklab, var(--dream-surface) 86%, transparent);
-  --dream-task-immersive-mid: color-mix(in oklab, var(--dream-surface) 78%, transparent);
-  --dream-task-immersive-far: color-mix(in oklab, var(--dream-surface) 66%, transparent);
 }
 
 :root.codex-dream-skin.dream-theme-dark {
@@ -43,16 +54,16 @@
   --dream-hero-shade: color-mix(in oklab, var(--dream-surface) 91%, transparent);
   --dream-ambient-opacity: .22;
   --dream-shadow: 0 18px 48px color-mix(in oklab, oklch(0.06 0.01 245) 72%, transparent);
-  --dream-immersive-edge: color-mix(in oklab, var(--dream-surface) 43%, transparent);
-  --dream-immersive-mid: color-mix(in oklab, var(--dream-surface) 27%, transparent);
-  --dream-immersive-far: color-mix(in oklab, var(--dream-surface) 16%, transparent);
-  --dream-immersive-sidebar: color-mix(in oklab, var(--dream-sidebar) 48%, transparent);
-  --dream-task-immersive-sidebar: color-mix(in oklab, var(--dream-sidebar) 70%, transparent);
+  --dream-immersive-edge-base: color-mix(in oklab, var(--dream-surface) 43%, transparent);
+  --dream-immersive-mid-base: color-mix(in oklab, var(--dream-surface) 27%, transparent);
+  --dream-immersive-far-base: color-mix(in oklab, var(--dream-surface) 16%, transparent);
+  --dream-immersive-sidebar-base: color-mix(in oklab, var(--dream-sidebar) 48%, transparent);
+  --dream-task-immersive-sidebar-base: color-mix(in oklab, var(--dream-sidebar) 70%, transparent);
+  --dream-task-immersive-edge-base: color-mix(in oklab, var(--dream-surface) 82%, transparent);
+  --dream-task-immersive-mid-base: color-mix(in oklab, var(--dream-surface) 74%, transparent);
+  --dream-task-immersive-far-base: color-mix(in oklab, var(--dream-surface) 60%, transparent);
   --dream-immersive-composer: color-mix(in oklab, var(--dream-surface-raised) 88%, var(--dream-accent) 5%);
   --dream-immersive-line: color-mix(in oklab, var(--dream-line) 82%, transparent);
-  --dream-task-immersive-edge: color-mix(in oklab, var(--dream-surface) 82%, transparent);
-  --dream-task-immersive-mid: color-mix(in oklab, var(--dream-surface) 74%, transparent);
-  --dream-task-immersive-far: color-mix(in oklab, var(--dream-surface) 60%, transparent);
 }
 
 html.codex-dream-skin body {
@@ -114,20 +125,28 @@ html.codex-dream-skin main.main-surface > header.app-header-tint {
   backdrop-filter: blur(12px) saturate(1.05) !important;
 }
 
-/* Wide art also reaches the native application menu, which sits outside the
-   main surface and needs its own dark-theme legibility layer. */
-html.codex-dream-skin.dream-theme-dark [class~="group/application-menu-top-bar"] {
+/* The native application menu sits outside the main surface. Give both shell
+   appearances a stable readability layer because media behind it can change
+   from bright to dark independently of Codex's light or dark preference. */
+html.codex-dream-skin [class~="group/application-menu-top-bar"] {
   color: var(--dream-text) !important;
-  background: color-mix(in oklab, var(--dream-sidebar) 90%, transparent) !important;
+  background: color-mix(in oklab,
+    color-mix(in oklab, var(--dream-sidebar) 88%, transparent)
+    var(--dream-wallpaper-cover), transparent) !important;
   border-bottom: 1px solid var(--dream-line-soft) !important;
   box-shadow: 0 1px 12px color-mix(in oklab, var(--dream-canvas) 72%, transparent) !important;
-  backdrop-filter: blur(16px) saturate(.9) !important;
+  backdrop-filter: blur(18px) saturate(.88) !important;
+}
+
+html.codex-dream-skin.dream-art-video [class~="group/application-menu-top-bar"] {
+  background: color-mix(in oklab,
+    color-mix(in oklab, var(--dream-sidebar) 94%, transparent)
+    var(--dream-wallpaper-cover), transparent) !important;
 }
 
-html.codex-dream-skin.dream-theme-dark [class~="group/application-menu-top-bar"] button,
-html.codex-dream-skin.dream-theme-dark [class~="group/application-menu-top-bar"] svg {
+html.codex-dream-skin [class~="group/application-menu-top-bar"] button,
+html.codex-dream-skin [class~="group/application-menu-top-bar"] svg {
   color: var(--dream-text) !important;
-  text-shadow: 0 1px 2px color-mix(in oklab, var(--dream-canvas) 82%, transparent) !important;
 }
 
 #codex-dream-skin-chrome {
@@ -144,6 +163,7 @@ html.codex-dream-skin.dream-theme-dark [class~="group/application-menu-top-bar"]
   border: 0;
   object-fit: cover;
   object-position: var(--dream-art-position);
+  opacity: 1;
   pointer-events: none;
 }
 
@@ -170,7 +190,7 @@ html.codex-dream-skin .dream-task::before {
   z-index: 0;
   inset: 0;
   pointer-events: none;
-  opacity: var(--dream-ambient-opacity);
+  opacity: calc(var(--dream-ambient-opacity) * var(--dream-wallpaper-reveal));
   background-image: var(--dream-art);
   background-repeat: no-repeat;
   background-position: var(--dream-art-position);
@@ -192,7 +212,7 @@ html.codex-dream-skin.dream-art-wide:not(.dream-task-banner) .dream-task::before
 html.codex-dream-skin.dream-task-banner .dream-task::before {
   bottom: auto;
   height: min(46vh, 520px);
-  opacity: calc(var(--dream-ambient-opacity) * 1.8);
+  opacity: calc(var(--dream-ambient-opacity) * var(--dream-wallpaper-reveal) * 1.8);
   mask-image: linear-gradient(to bottom, oklch(0 0 0) 0, oklch(0 0 0 / .9) 52%, transparent 100%);
 }
 
@@ -254,7 +274,9 @@ html.codex-dream-skin .dream-home {
   overflow: hidden !important;
   border: 1px solid var(--dream-line) !important;
   border-radius: 20px !important;
-  background-image: var(--dream-art) !important;
+  background-image:
+    linear-gradient(var(--dream-media-overlay), var(--dream-media-overlay)),
+    var(--dream-art) !important;
   background-repeat: no-repeat !important;
   background-size: cover !important;
   background-position: var(--dream-art-position) !important;
@@ -426,7 +448,9 @@ html.codex-dream-skin article {
 html.codex-dream-skin.dream-art-wide:has(main.main-surface.dream-home-shell) body,
 html.codex-dream-skin.dream-art-wide:is(.dream-task-ambient, .dream-task-banner):has(main.main-surface:not(.dream-home-shell)) body {
   background-color: var(--dream-canvas) !important;
-  background-image: var(--dream-art) !important;
+  background-image:
+    linear-gradient(var(--dream-media-overlay), var(--dream-media-overlay)),
+    var(--dream-art) !important;
   background-position: var(--dream-art-position) !important;
   background-size: cover !important;
   background-repeat: no-repeat !important;
@@ -499,6 +523,26 @@ html.codex-dream-skin.dream-art-wide main.main-surface > header.app-header-tint
   filter: drop-shadow(0 1px 2px color-mix(in oklab, var(--dream-canvas) 72%, transparent));
 }
 
+/* Unlike a static image, a video can invalidate foreground contrast on every
+   frame. Keep the secondary Codex toolbar translucent but independently
+   readable instead of relying on text shadows over the moving media. */
+html.codex-dream-skin.dream-art-video main.main-surface > header.app-header-tint {
+  color: var(--dream-text) !important;
+  background: color-mix(in oklab,
+    color-mix(in oklab, var(--dream-surface) 86%, transparent)
+    var(--dream-wallpaper-cover), transparent) !important;
+  border-bottom: 1px solid var(--dream-line-soft) !important;
+  box-shadow: 0 1px 12px color-mix(in oklab, var(--dream-canvas) 44%, transparent) !important;
+  backdrop-filter: blur(16px) saturate(.9) !important;
+  text-shadow: 0 1px 2px color-mix(in oklab, var(--dream-canvas) 86%, transparent),
+    0 0 8px color-mix(in oklab, var(--dream-canvas) 58%, transparent) !important;
+}
+
+html.codex-dream-skin.dream-art-video main.main-surface > header.app-header-tint svg {
+  color: var(--dream-text) !important;
+  filter: drop-shadow(0 1px 2px color-mix(in oklab, var(--dream-canvas) 72%, transparent));
+}
+
 html.codex-dream-skin.dream-art-wide main.main-surface [role="main"] {
   background: transparent !important;
 }
diff --git a/windows/assets/renderer-inject.js b/windows/assets/renderer-inject.js
index d70ab9f..bd15d17 100644
--- a/windows/assets/renderer-inject.js
+++ b/windows/assets/renderer-inject.js
@@ -29,6 +29,8 @@
     "--dream-accent",
     "--dream-accent-ink",
     "--dream-image-luma",
+    "--dream-wallpaper-reveal",
+    "--dream-wallpaper-cover",
   ];
   const HOME_UTILITY_CLASS = "dream-home-utility";
   const installToken = {};
@@ -84,6 +86,9 @@
     const playbackRate = Number.isFinite(Number(media.playbackRate))
       ? clamp(Number(media.playbackRate), .25, 2)
       : 1;
+    const wallpaperReveal = Number.isFinite(Number(media.opacity))
+      ? clamp(Number(media.opacity))
+      : 1;
     const metadataRatio = Number(config?.artMetadata?.ratio);
     return {
       appearance,
@@ -97,6 +102,7 @@
       mediaMime,
       mediaSize,
       playbackRate,
+      wallpaperReveal,
     };
   };
 
@@ -352,6 +358,18 @@
     root.style.setProperty("--dream-accent", accent);
     root.style.setProperty("--dream-accent-ink", accentInk);
     root.style.setProperty("--dream-image-luma", profile.luma.toFixed(3));
+    root.style.setProperty("--dream-wallpaper-reveal", config.wallpaperReveal.toFixed(2));
+    root.style.setProperty("--dream-wallpaper-cover", `${Math.round((1 - config.wallpaperReveal) * 100)}%`);
+  };
+
+  const setWallpaperReveal = (value) => {
+    const numeric = Number(value);
+    if (!Number.isFinite(numeric) || numeric < 0 || numeric > 1) return null;
+    config.wallpaperReveal = numeric;
+    const root = document.documentElement;
+    root?.style.setProperty("--dream-wallpaper-reveal", numeric.toFixed(2));
+    root?.style.setProperty("--dream-wallpaper-cover", `${Math.round((1 - numeric) * 100)}%`);
+    return numeric;
   };
 
   const syncMediaElement = () => {
@@ -528,7 +546,7 @@
   document.addEventListener?.("visibilitychange", visibilityHandler);
   window[STATE_KEY] = {
     ensure, cleanup, observer, timer, scheduler, artUrl, mediaUrl, beginMedia, appendMedia, commitMedia,
-    visibilityHandler, profile, config, installToken, version: "1.2.0",
+    setWallpaperReveal, visibilityHandler, profile, config, installToken, version: "1.2.0",
   };
   ensure();
   analyzeArt().then((result) => {
diff --git a/windows/scripts/injector.mjs b/windows/scripts/injector.mjs
index 2f2f446..fbb7416 100644
--- a/windows/scripts/injector.mjs
+++ b/windows/scripts/injector.mjs
@@ -371,6 +371,11 @@ async function loadTheme(themeDir) {
   if (!Number.isFinite(playbackRate) || playbackRate < 0.25 || playbackRate > 2) {
     throw new Error("media.playbackRate must be between 0.25 and 2");
   }
+  const opacity = rawMedia.opacity === null || rawMedia.opacity === undefined
+    ? 1 : Number(rawMedia.opacity);
+  if (!Number.isFinite(opacity) || opacity < 0 || opacity > 1) {
+    throw new Error("media.opacity must be between 0 and 1");
+  }
   const theme = {
     id: normalizedText(raw.id, "id", "custom", 80),
     name: normalizedText(raw.name, "name", "Codex Dream Skin", 120),
@@ -386,6 +391,7 @@ async function loadTheme(themeDir) {
     media: {
       type: inferredMediaType,
       playbackRate,
+      opacity,
     },
   };
   if (typeof palette.accent === "string" && palette.accent.trim()) {
@@ -462,6 +468,21 @@ async function loadPayload(themeDir = path.join(root, "assets"), candidateTheme
   return { ...themeState, payload };
 }
 
+export function isOpacityOnlyThemeChange(previous, next) {
+  if (!previous || !next ||
+      previous.mediaPath !== next.mediaPath ||
+      previous.mediaType !== next.mediaType ||
+      previous.mediaMime !== next.mediaMime ||
+      previous.mediaSize !== next.mediaSize) return false;
+  const withoutOpacity = (theme) => {
+    const comparable = structuredClone(theme);
+    if (comparable.media) delete comparable.media.opacity;
+    return comparable;
+  };
+  return JSON.stringify(withoutOpacity(previous.theme)) === JSON.stringify(withoutOpacity(next.theme)) &&
+    previous.theme?.media?.opacity !== next.theme?.media?.opacity;
+}
+
 async function fileExists(filePath) {
   if (!filePath) return false;
   try {
@@ -595,6 +616,18 @@ export async function transferVideoToSession(session, loadedPayload) {
   return { bytes: offset, chunks };
 }
 
+export async function setOpacityOnSession(session, value) {
+  const opacity = normalizedUnit(value, "media.opacity");
+  if (opacity === null) throw new Error("media.opacity must be a number between 0 and 1");
+  const applied = await session.evaluate(`(() => {
+    const requested = ${JSON.stringify(opacity)};
+    const actual = window.__CODEX_DREAM_SKIN_STATE__?.setWallpaperReveal?.(requested);
+    return Number.isFinite(actual) && Math.abs(actual - requested) < 0.000001;
+  })()`);
+  if (!applied) throw new Error("Renderer rejected the wallpaper reveal update");
+  return opacity;
+}
+
 async function applyToSession(session, loadedPayload) {
   const result = await session.evaluate(loadedPayload.payload);
   if (loadedPayload.mediaType === "video") {
@@ -664,7 +697,8 @@ async function removeFromSession(session) {
     );
     for (const property of [
       '--dream-art', '--dream-art-position', '--dream-focus-x', '--dream-focus-y',
-      '--dream-accent', '--dream-accent-ink', '--dream-image-luma'
+      '--dream-accent', '--dream-accent-ink', '--dream-image-luma',
+      '--dream-wallpaper-reveal', '--dream-wallpaper-cover'
     ]) document.documentElement?.style.removeProperty(property);
     document.querySelectorAll('.dream-home').forEach((node) => node.classList.remove('dream-home'));
     document.querySelectorAll('.dream-task').forEach((node) => node.classList.remove('dream-task'));
@@ -709,8 +743,14 @@ async function verifySession(session) {
       chromePresent: Boolean(document.getElementById('codex-dream-skin-chrome')),
       chromePointerEvents: getComputedStyle(document.getElementById('codex-dream-skin-chrome') || document.body).pointerEvents,
       mediaType: window.__CODEX_DREAM_SKIN_STATE__?.config?.mediaType ?? 'image',
+      wallpaperReveal: window.__CODEX_DREAM_SKIN_STATE__?.config?.wallpaperReveal ?? null,
       mediaPresent: Boolean(document.getElementById('codex-dream-skin-media')),
       mediaReady: Boolean(window.__CODEX_DREAM_SKIN_STATE__?.mediaUrl),
+      mediaElementOpacity: document.getElementById('codex-dream-skin-media')
+        ? getComputedStyle(document.getElementById('codex-dream-skin-media')).opacity
+        : null,
+      mainBackground: getComputedStyle(document.querySelector('main.main-surface') || document.body).backgroundImage,
+      sidebarBackground: getComputedStyle(document.querySelector('aside.app-shell-left-panel') || document.body).backgroundImage,
       homePresent: Boolean(home),
       suggestionsPresent: Boolean(suggestions),
       hero: box(home?.firstElementChild?.firstElementChild?.firstElementChild),
@@ -726,7 +766,9 @@ async function verifySession(session) {
     result.pass = result.installed && result.version === result.expectedVersion &&
       result.stylePresent && result.chromePresent &&
       result.chromePointerEvents === 'none' && Boolean(result.composer) && Boolean(result.sidebar) &&
-      (result.mediaType !== 'video' || (result.mediaPresent && result.mediaReady)) &&
+      Number.isFinite(result.wallpaperReveal) && result.wallpaperReveal >= 0 && result.wallpaperReveal <= 1 &&
+      (result.mediaType !== 'video' ||
+        (result.mediaPresent && result.mediaReady && result.mediaElementOpacity === '1')) &&
       (!result.homePresent || (Boolean(result.hero) &&
         (!result.suggestionsPresent || (result.cards.length >= 2 && result.cards.length <= 4))));
     return result;
@@ -915,6 +957,8 @@ async function runWatch(options) {
       }
       const pauseChanged = nextPaused !== paused;
       const payloadChanged = !nextPaused && nextPayload !== loadedPayload;
+      const opacityOnlyChanged = payloadChanged && !pauseChanged &&
+        isOpacityOnlyThemeChange(loadedPayload, nextPayload);
       loadedPayload = nextPayload;
       paused = nextPaused;
 
@@ -948,7 +992,11 @@ async function runWatch(options) {
               if (loadedPayload.mediaType === "video") {
                 attachLoadFallback(id, { id }, session);
               }
-              await applyToSession(session, loadedPayload);
+              if (opacityOnlyChanged) {
+                await setOpacityOnSession(session, loadedPayload.theme.media.opacity);
+              } else {
+                await applyToSession(session, loadedPayload);
+              }
             }
           } catch (error) {
             console.error(`[dream-skin] live theme update failed for ${id}: ${error.message}`);
diff --git a/windows/scripts/theme-windows.ps1 b/windows/scripts/theme-windows.ps1
index 4650366..03624a6 100644
--- a/windows/scripts/theme-windows.ps1
+++ b/windows/scripts/theme-windows.ps1
@@ -130,6 +130,46 @@ function Get-DreamSkinMediaType {
   throw "Unsupported theme media format: $extension"
 }
 
+function ConvertTo-DreamSkinMediaOpacity {
+  param(
+    [AllowNull()][object]$Value,
+    [double]$Default = 1
+  )
+  if ($null -eq $Value -or "$Value" -eq '') { return $Default }
+  try { $opacity = [double]$Value } catch { throw 'Theme media opacity must be a number between 0 and 1.' }
+  if ([double]::IsNaN($opacity) -or [double]::IsInfinity($opacity) -or
+    $opacity -lt 0 -or $opacity -gt 1) {
+    throw 'Theme media opacity must be a number between 0 and 1.'
+  }
+  return $opacity
+}
+
+function Get-DreamSkinThemeMediaOpacity {
+  param([AllowNull()][object]$Theme)
+  if ($null -eq $Theme -or $null -eq $Theme.media) { return [double]1 }
+  $property = $Theme.media.PSObject.Properties['opacity']
+  if ($null -eq $property) { return [double]1 }
+  return ConvertTo-DreamSkinMediaOpacity -Value $property.Value
+}
+
+function Get-DreamSkinThemeMediaRevealPercent {
+  param([AllowNull()][object]$Theme)
+  $opacity = Get-DreamSkinThemeMediaOpacity -Theme $Theme
+  return [int][math]::Round($opacity * 100)
+}
+
+function ConvertTo-DreamSkinMediaOpacityFromRevealPercent {
+  param([Parameter(Mandatory = $true)][object]$Percent)
+  try { $reveal = [double]$Percent } catch {
+    throw 'Theme wallpaper reveal must be a number between 0 and 100.'
+  }
+  if ([double]::IsNaN($reveal) -or [double]::IsInfinity($reveal) -or
+    $reveal -lt 0 -or $reveal -gt 100) {
+    throw 'Theme wallpaper reveal must be a number between 0 and 100.'
+  }
+  return [double]($reveal / 100)
+}
+
 function Assert-DreamSkinMediaFile {
   param(
     [Parameter(Mandatory = $true)][string]$Path,
@@ -219,6 +259,7 @@ function Read-DreamSkinTheme {
   if ($theme.media -and $theme.media.type -and "$($theme.media.type)" -cne $mediaType) {
     throw "Theme media type does not match its file extension: $mediaPath"
   }
+  $null = Get-DreamSkinThemeMediaOpacity -Theme $theme
   return [pscustomobject]@{
     Directory = $directory
     ThemePath = $themePath
@@ -322,7 +363,7 @@ function Set-DreamSkinActiveTheme {
       appearance = 'auto'
       art = [pscustomobject]@{ focusX = $null; focusY = $null; safeArea = 'auto'; taskMode = 'auto' }
       palette = [pscustomobject]@{}
-      media = [pscustomobject]@{ type = $mediaType; playbackRate = 1 }
+      media = [pscustomobject]@{ type = $mediaType; playbackRate = 1; opacity = 1 }
     }
   }
   $imageName = New-DreamSkinThemeImageName -Extension $extension
@@ -341,7 +382,7 @@ function Set-DreamSkinActiveTheme {
     $Theme | Add-Member -NotePropertyName media -NotePropertyValue `
       ([pscustomobject]@{ type = $mediaType; playbackRate = if ($Theme.media.playbackRate) {
         [double]$Theme.media.playbackRate
-      } else { 1 } }) -Force
+      } else { 1 }; opacity = Get-DreamSkinThemeMediaOpacity -Theme $Theme }) -Force
     if ($Name) { $Theme | Add-Member -NotePropertyName name -NotePropertyValue $Name -Force }
     if (-not $Theme.id) { $Theme | Add-Member -NotePropertyName id -NotePropertyValue 'custom' -Force }
     if (-not $Theme.appearance) { $Theme | Add-Member -NotePropertyName appearance -NotePropertyValue 'auto' -Force }
@@ -369,6 +410,25 @@ function Set-DreamSkinActiveTheme {
   return Read-DreamSkinTheme -ThemeDirectory $paths.Active
 }
 
+function Set-DreamSkinActiveThemeMediaOpacity {
+  param(
+    [Parameter(Mandatory = $true)][object]$Opacity,
+    [string]$StateRoot = (Join-Path $env:LOCALAPPDATA 'CodexDreamSkin')
+  )
+  $normalized = ConvertTo-DreamSkinMediaOpacity -Value $Opacity
+  $paths = Get-DreamSkinThemePaths -StateRoot $StateRoot
+  $active = Read-DreamSkinTheme -ThemeDirectory $paths.Active -SkipImageMetadata
+  $theme = $active.Theme | ConvertTo-Json -Depth 8 | ConvertFrom-Json
+  if ($null -eq $theme.media) {
+    $theme | Add-Member -NotePropertyName media -NotePropertyValue `
+      ([pscustomobject]@{ type = $active.MediaType; playbackRate = 1; opacity = $normalized }) -Force
+  } else {
+    $theme.media | Add-Member -NotePropertyName opacity -NotePropertyValue $normalized -Force
+  }
+  Write-DreamSkinTheme -ThemeDirectory $paths.Active -Theme $theme
+  return Read-DreamSkinTheme -ThemeDirectory $paths.Active -SkipImageMetadata
+}
+
 function Save-DreamSkinCurrentTheme {
   param(
     [Parameter(Mandatory = $true)][string]$Name,
diff --git a/windows/scripts/tray-dream-skin.ps1 b/windows/scripts/tray-dream-skin.ps1
index 2564f77..afe72ba 100644
--- a/windows/scripts/tray-dream-skin.ps1
+++ b/windows/scripts/tray-dream-skin.ps1
@@ -66,6 +66,51 @@ try {
     return $item
   }
 
+  function Add-DreamSkinRevealControl {
+    param(
+      [Parameter(Mandatory = $true)][AllowEmptyCollection()][System.Windows.Forms.ToolStripItemCollection]$Items,
+      [Parameter(Mandatory = $true)][object]$Theme
+    )
+    $percent = Get-DreamSkinThemeMediaRevealPercent -Theme $Theme
+    $label = [System.Windows.Forms.ToolStripLabel]::new("壁纸透出：$percent%")
+    $label.Margin = [System.Windows.Forms.Padding]::new(8, 3, 8, 0)
+    [void]$Items.Add($label)
+
+    $trackBar = [System.Windows.Forms.TrackBar]::new()
+    $trackBar.Minimum = 0
+    $trackBar.Maximum = 100
+    $trackBar.Value = $percent
+    $trackBar.TickFrequency = 10
+    $trackBar.SmallChange = 5
+    $trackBar.LargeChange = 10
+    $trackBar.AutoSize = $false
+    $trackBar.Size = [System.Drawing.Size]::new(250, 38)
+    $trackBar.AccessibleName = '壁纸透出程度'
+
+    $updateLabel = {
+      $label.Text = "壁纸透出：$($trackBar.Value)%"
+    }.GetNewClosure()
+    $commitReveal = {
+      try {
+        $label.Text = "壁纸透出：$($trackBar.Value)%"
+        $null = Set-DreamSkinActiveThemeMediaOpacity `
+          -Opacity (ConvertTo-DreamSkinMediaOpacityFromRevealPercent -Percent $trackBar.Value) `
+          -StateRoot $StateRoot
+      } catch {
+        Show-DreamSkinTrayError -Message $_.Exception.Message
+      }
+    }.GetNewClosure()
+    $trackBar.add_Scroll($updateLabel)
+    $trackBar.add_MouseUp($commitReveal)
+    $trackBar.add_KeyUp($commitReveal)
+
+    $controlHost = [System.Windows.Forms.ToolStripControlHost]::new($trackBar)
+    $controlHost.AutoSize = $false
+    $controlHost.Size = [System.Drawing.Size]::new(270, 42)
+    $controlHost.Margin = [System.Windows.Forms.Padding]::new(4, 0, 4, 4)
+    [void]$Items.Add($controlHost)
+  }
+
   function Rebuild-DreamSkinTrayMenu {
     $menu.Items.Clear()
     $paused = Test-DreamSkinPaused -StateRoot $StateRoot
@@ -78,6 +123,9 @@ try {
       $status += " · $($active.Theme.name)"
     }
     $null = Add-DreamSkinTrayItem -Items $menu.Items -Text $status -Action $null -Enabled $false
+    if ($null -ne $active -and $null -ne $active.Theme) {
+      Add-DreamSkinRevealControl -Items $menu.Items -Theme $active.Theme
+    }
     [void]$menu.Items.Add([System.Windows.Forms.ToolStripSeparator]::new())
 
     $null = Add-DreamSkinTrayItem -Items $menu.Items -Text '应用或重新应用' -Action {
diff --git a/windows/tests/dynamic-media.test.mjs b/windows/tests/dynamic-media.test.mjs
index 4258ebf..811f970 100644
--- a/windows/tests/dynamic-media.test.mjs
+++ b/windows/tests/dynamic-media.test.mjs
@@ -4,7 +4,11 @@ import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
-import { transferVideoToSession } from "../scripts/injector.mjs";
+import {
+  isOpacityOnlyThemeChange,
+  setOpacityOnSession,
+  transferVideoToSession,
+} from "../scripts/injector.mjs";
 
 const here = path.dirname(fileURLToPath(import.meta.url));
 const injectorPath = path.resolve(here, "../scripts/injector.mjs");
@@ -41,7 +45,7 @@ try {
     name: "Video Fixture",
     image: "loop.mp4",
     appearance: "dark",
-    media: { type: "video", playbackRate: 1.25 },
+    media: { type: "video", playbackRate: 1.25, opacity: 0.4 },
     art: { focusX: 0.5, focusY: 0.5, safeArea: "center", taskMode: "ambient" },
   }));
 
@@ -51,6 +55,7 @@ try {
   assert.equal(summary.media.type, "video");
   assert.equal(summary.media.mime, "video/mp4");
   assert.equal(summary.media.size, videoBytes.length);
+  assert.equal(summary.media.opacity, 0.4);
   assert.ok(summary.payloadBytes < videoBytes.length,
     "The CDP bootstrap payload must not embed the complete video.");
 
@@ -73,6 +78,29 @@ try {
   assert.ok(expressions.slice(1, -1).every((expression) => expression.includes(".appendMedia(")));
   assert.ok(expressions.every((expression) => Buffer.byteLength(expression) < 1024 * 1024));
 
+  const opacityExpressions = [];
+  const opacitySession = {
+    async evaluate(expression) {
+      opacityExpressions.push(expression);
+      return true;
+    },
+  };
+  assert.equal(await setOpacityOnSession(opacitySession, 0.65), 0.65);
+  assert.match(opacityExpressions[0], /setWallpaperReveal/);
+
+  const previousTheme = {
+    mediaPath: videoPath,
+    mediaType: "video",
+    mediaMime: "video/mp4",
+    mediaSize: videoBytes.length,
+    theme: { id: "same", media: { type: "video", playbackRate: 1, opacity: 0.4 } },
+  };
+  const opacityTheme = structuredClone(previousTheme);
+  opacityTheme.theme.media.opacity = 0.65;
+  assert.equal(isOpacityOnlyThemeChange(previousTheme, opacityTheme), true);
+  opacityTheme.theme.media.playbackRate = 1.25;
+  assert.equal(isOpacityOnlyThemeChange(previousTheme, opacityTheme), false);
+
   const invalidDirectory = path.join(temporary, "invalid");
   await fs.mkdir(invalidDirectory);
   await fs.writeFile(path.join(invalidDirectory, "fake.mp4"), Buffer.from("not an mp4"));
@@ -84,6 +112,18 @@ try {
   const rejected = await runInjector(invalidDirectory);
   assert.notEqual(rejected.code, 0);
   assert.match(rejected.stderr, /signature|container/i);
+
+  const invalidOpacityDirectory = path.join(temporary, "invalid-opacity");
+  await fs.mkdir(invalidOpacityDirectory);
+  await fs.copyFile(videoPath, path.join(invalidOpacityDirectory, "loop.mp4"));
+  await fs.writeFile(path.join(invalidOpacityDirectory, "theme.json"), JSON.stringify({
+    id: "invalid-opacity",
+    image: "loop.mp4",
+    media: { type: "video", opacity: 1.1 },
+  }));
+  const rejectedOpacity = await runInjector(invalidOpacityDirectory);
+  assert.notEqual(rejectedOpacity.code, 0);
+  assert.match(rejectedOpacity.stderr, /opacity/i);
 } finally {
   await fs.rm(temporary, { recursive: true, force: true });
 }
diff --git a/windows/tests/renderer-inject.test.mjs b/windows/tests/renderer-inject.test.mjs
index 3ae2771..da9a6ad 100644
--- a/windows/tests/renderer-inject.test.mjs
+++ b/windows/tests/renderer-inject.test.mjs
@@ -34,6 +34,36 @@ assert.match(
   /main\.main-surface\.dream-task\s+\.app-shell-main-content-top-fade\s*\{[^}]*display:\s*none !important;/,
   "Fallback task routes must remove the native top fade seam.",
 );
+assert.match(
+  css,
+  /html\.codex-dream-skin \[class~="group\/application-menu-top-bar"\]\s*\{[^}]*background:\s*color-mix\([^}]*backdrop-filter:\s*blur\(/,
+  "The native application menu must have a legibility layer in both light and dark themes.",
+);
+assert.match(
+  css,
+  /html\.codex-dream-skin \[class~="group\/application-menu-top-bar"\] button,[\s\S]*?\[class~="group\/application-menu-top-bar"\] svg\s*\{[^}]*color:\s*var\(--dream-text\) !important;/,
+  "Application menu controls must use the opaque adaptive theme text color.",
+);
+assert.match(
+  css,
+  /\.dream-art-video main\.main-surface\s*>\s*header\.app-header-tint\s*\{[^}]*background:\s*color-mix\([^}]*backdrop-filter:\s*blur\(/,
+  "Dynamic wallpaper mode must protect the secondary Codex toolbar from changing video frames.",
+);
+assert.match(
+  css,
+  /#codex-dream-skin-media\s*\{[^}]*opacity:\s*1\b/,
+  "Dynamic wallpaper must stay at its original opacity.",
+);
+assert.match(
+  css,
+  /linear-gradient\(var\(--dream-media-overlay\),\s*var\(--dream-media-overlay\)\),\s*var\(--dream-art\)/,
+  "Static wallpaper surfaces must blend with the canvas through the shared reveal control.",
+);
+assert.match(
+  css,
+  /--dream-immersive-edge:\s*color-mix\([^;]*var\(--dream-wallpaper-cover\)[^;]*transparent\)/,
+  "The full-window foreground veil must disappear as wallpaper reveal reaches 100%.",
+);
 
 function createFixture({
   shellPresent,
@@ -335,6 +365,7 @@ const configuredPayload = buildPayload({
   appearance: "light",
   palette: { accent: "#d45a70" },
   art: { focusX: .15, focusY: .8, safeArea: "right", taskMode: "off" },
+  media: { opacity: 0.35 },
 });
 const configuredResult = vm.runInNewContext(configuredPayload, configured.context);
 assert.equal(configuredResult.adaptive, true);
@@ -345,6 +376,8 @@ assert.equal(configured.rootClasses.has("dream-safe-right"), true);
 assert.equal(configured.rootClasses.has("dream-task-off"), true);
 assert.equal(configured.rootStyles.get("--dream-art-position"), "15% 80%");
 assert.equal(configured.rootStyles.get("--dream-accent"), "#d45a70");
+assert.equal(configured.rootStyles.get("--dream-wallpaper-reveal"), "0.35");
+assert.equal(configured.rootStyles.get("--dream-wallpaper-cover"), "65%");
 assert.equal(configured.routeClasses.has("dream-home"), true);
 assert.equal(configured.routeClasses.has("dream-task"), false);
 assert.equal(configured.utilityClasses.has("dream-home-utility"), true);
@@ -423,10 +456,11 @@ assert.equal(metadataWide.rootClasses.has("dream-art-standard"), false);
 
 const videoTheme = createFixture({ shellPresent: true });
 vm.runInNewContext(buildPayload({
-  media: { type: "video", mime: "video/mp4", size: 4, playbackRate: 1 },
+  media: { type: "video", mime: "video/mp4", size: 4, playbackRate: 1, opacity: 0.6 },
   artMetadata: { ratio: 16 / 9 },
 }, ""), videoTheme.context);
 assert.equal(videoTheme.rootClasses.has("dream-art-video"), true);
+assert.equal(videoTheme.rootStyles.get("--dream-wallpaper-reveal"), "0.60");
 const videoState = videoTheme.context.window.__CODEX_DREAM_SKIN_STATE__;
 assert.equal(videoState.beginMedia({ mime: "video/mp4", size: 4 }), true);
 assert.equal(videoState.appendMedia("AAECAw=="), true);
@@ -435,6 +469,10 @@ assert.equal(videoTheme.nodes.has("codex-dream-skin-media"), true);
 assert.equal(videoTheme.nodes.get("codex-dream-skin-media").muted, true);
 assert.equal(videoTheme.nodes.get("codex-dream-skin-media").loop, true);
 assert.equal(videoTheme.nodes.get("codex-dream-skin-media").paused, false);
+assert.equal(videoState.setWallpaperReveal(0.25), 0.25);
+assert.equal(videoTheme.rootStyles.get("--dream-wallpaper-reveal"), "0.25");
+assert.equal(videoTheme.rootStyles.get("--dream-wallpaper-cover"), "75%");
+assert.equal(videoState.setWallpaperReveal(2), null);
 videoTheme.setDocumentHidden(true);
 assert.equal(videoTheme.nodes.get("codex-dream-skin-media").paused, true);
 videoTheme.setDocumentHidden(false);
diff --git a/windows/tests/run-tests.ps1 b/windows/tests/run-tests.ps1
index 9a37ab5..fa5a9df 100644
--- a/windows/tests/run-tests.ps1
+++ b/windows/tests/run-tests.ps1
@@ -632,9 +632,29 @@ try {
     $updatedTheme.Theme.id -cne 'custom' -or
     $updatedTheme.Theme.art.safeArea -cne 'auto' -or
     $updatedTheme.Theme.art.taskMode -cne 'auto' -or
+    [double]$updatedTheme.Theme.media.opacity -ne 1 -or
     -not (Test-DreamSkinThemePathWithin -Path $updatedTheme.ImagePath -Root $themePaths.Active)) {
     throw 'Imported image did not reset to the generic adaptive contract inside the managed directory.'
   }
+  $opacityTheme = Set-DreamSkinActiveThemeMediaOpacity -Opacity 0.42 -StateRoot $themeStateRoot
+  if ([math]::Abs((Get-DreamSkinThemeMediaOpacity -Theme $opacityTheme.Theme) - 0.42) -gt 0.000001) {
+    throw 'Active theme opacity was not persisted.'
+  }
+  if ((Get-DreamSkinThemeMediaRevealPercent -Theme ([pscustomobject]@{
+      media = [pscustomobject]@{ opacity = 1 }
+    })) -ne 100 -or
+    (Get-DreamSkinThemeMediaRevealPercent -Theme ([pscustomobject]@{
+      media = [pscustomobject]@{ opacity = 0 }
+    })) -ne 0 -or
+    [math]::Abs((ConvertTo-DreamSkinMediaOpacityFromRevealPercent -Percent 100) - 1) -gt 0.000001 -or
+    [math]::Abs((ConvertTo-DreamSkinMediaOpacityFromRevealPercent -Percent 55) - 0.55) -gt 0.000001) {
+    throw 'Tray wallpaper reveal percentage does not match the foreground veil contract.'
+  }
+  $invalidOpacityRejected = $false
+  try { $null = Set-DreamSkinActiveThemeMediaOpacity -Opacity 1.1 -StateRoot $themeStateRoot } catch {
+    $invalidOpacityRejected = $true
+  }
+  if (-not $invalidOpacityRejected) { throw 'Theme opacity accepted a value above 1.' }
   $null = Initialize-DreamSkinThemeStore -SkillRoot $Root -StateRoot $themeStateRoot
   $idempotentTheme = Read-DreamSkinTheme -ThemeDirectory $themePaths.Active
   if ($idempotentTheme.Theme.id -cne 'custom' -or
@@ -642,7 +662,9 @@ try {
     throw 'Theme-store initialization overwrote the active custom theme or duplicated its bundled preset.'
   }
   $savedTheme = Save-DreamSkinCurrentTheme -Name '已保存主题' -StateRoot $themeStateRoot
-  if ($savedTheme.Theme.name -cne '已保存主题' -or @(Get-DreamSkinSavedThemes -StateRoot $themeStateRoot).Count -ne 2) {
+  if ($savedTheme.Theme.name -cne '已保存主题' -or
+    [math]::Abs((Get-DreamSkinThemeMediaOpacity -Theme $savedTheme.Theme) - 0.42) -gt 0.000001 -or
+    @(Get-DreamSkinSavedThemes -StateRoot $themeStateRoot).Count -ne 2) {
     throw 'Saved theme creation or discovery failed.'
   }
   $null = Use-DreamSkinSavedTheme -ThemeDirectory $savedTheme.Directory -StateRoot $themeStateRoot
@@ -657,6 +679,7 @@ try {
   $videoTheme = Set-DreamSkinActiveTheme -ImagePath $videoFixture -Theme $null `
     -Name '动态测试主题' -StateRoot $themeStateRoot
   if ($videoTheme.Theme.media.type -cne 'video' -or
+    [double]$videoTheme.Theme.media.opacity -ne 1 -or
     [System.IO.Path]::GetExtension($videoTheme.ImagePath) -cne '.mp4' -or
     -not (Test-DreamSkinThemePathWithin -Path $videoTheme.ImagePath -Root $themePaths.Active)) {
     throw 'Imported video did not become a managed dynamic theme.'
@@ -742,6 +765,9 @@ try {
   $css = Read-DreamSkinUtf8File -Path (Join-Path $Root 'assets\dream-skin.css')
   foreach ($requiredCss in @(
     'background-image: var(--dream-art)',
+    '--dream-wallpaper-reveal',
+    '--dream-wallpaper-cover',
+    '--dream-media-overlay',
     'main.main-surface > header.app-header-tint',
     '[class~="group/application-menu-top-bar"]',
     '.app-shell-main-content-top-fade',
@@ -755,7 +781,7 @@ try {
     if (-not $css.Contains($requiredCss)) { throw "Windows immersive CSS is missing: $requiredCss" }
   }
   $traySource = Read-DreamSkinUtf8File -Path (Join-Path $Root 'scripts\tray-dream-skin.ps1')
-  foreach ($requiredTrayAction in @('System.Windows.Forms.NotifyIcon', '暂停皮肤', '更换背景图或视频', '*.mp4;*.webm', '已保存主题', '完全恢复 Codex')) {
+  foreach ($requiredTrayAction in @('System.Windows.Forms.NotifyIcon', 'System.Windows.Forms.TrackBar', '壁纸透出', '暂停皮肤', '更换背景图或视频', '*.mp4;*.webm', '已保存主题', '完全恢复 Codex')) {
     if (-not $traySource.Contains($requiredTrayAction)) { throw "Tray action is missing: $requiredTrayAction" }
   }
   if (-not $traySource.Contains('[AllowEmptyCollection()][System.Windows.Forms.ToolStripItemCollection]$Items')) {