diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index 5a56894ea..68dd0c241 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -5640,6 +5640,13 @@ iframe.preview-frame {
   flex-direction: column;
   flex: 1 1 auto;
   min-height: 0;
+  /*
+   * 顶部工具条带（搜索框、筛选条、状态提示）在流内占一条独立排布带，
+   * `--game-resource-book-tools-height` 由实测高度写入。铺满管理区的画本场景按同一
+   * 变量把自己缩到这条带下面，栏目标题栏与栏目大纲就不会和搜索框落在同一条排布带上
+   * （分页态与总览态都适用）。
+   */
+  padding-top: var(--game-resource-book-tools-height, 0px);
 }
 
 .game-resource-book-manager {
@@ -5651,7 +5658,8 @@ iframe.preview-frame {
 .game-resource-book-scene {
   position: absolute;
   z-index: 20;
-  inset: 0;
+  /* 顶边让出工具条带：栏目标题栏与栏目大纲整体下移，不与搜索框争同一条排布带。 */
+  inset: var(--game-resource-book-tools-height, 0px) 0 0;
   overflow: hidden;
   pointer-events: none;
   transition: none;
@@ -6158,20 +6166,35 @@ iframe.preview-frame {
 }
 
 /*
- * 资源画本的卡片与栏目标题栏都画在铺满资源区的 `.game-resource-book-scene`
- * （z-index 20）里，流式工具条默认被它整个盖住。搜索框和它下面的提示条必须抬到
- * 场景之上（与右下角缩放 Dock 同为 40），否则放开 display 也只是"画了但看不见"。
+ * 工具条带：搜索框、筛选条与状态提示在这里按独立排布行排列，画本场景从这条带下面
+ * 开始（见 `.game-resource-manager` 的 padding-top）。工具条里的浮层元素仍高于场景
+ * （z-index 40 > 场景的 20），工具条内容溢出时不会被画本盖住。
  */
+.game-resource-book-tools {
+  position: absolute;
+  top: 0;
+  right: 0;
+  left: 0;
+  z-index: 40;
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  padding: 10px 12px 4px;
+}
+
+.game-resource-book-tools > * {
+  margin: 0;
+  width: 100%;
+}
+
 .game-resource-search {
   position: relative;
   z-index: 40;
   display: flex;
-  /* 常态居中，避开总览态标题和分页态栏目标题栏左右两端的内容。 */
-  align-self: center;
   align-items: center;
   gap: 8px;
+  align-self: center;
   width: min(300px, 100%);
-  margin: 10px 12px 0;
   padding: 0 10px;
   border: 1px solid #ecdcd4;
   border-radius: 10px;
@@ -8859,6 +8882,16 @@ iframe.preview-frame {
   font-size: 12px;
 }
 
+/*
+ * 窄屏（移动端优先）：筛选条与标签开始换行时，搜索框改为整行独占，
+ * 工具条带变高后画本场景按实测高度继续下移，任何宽度下都不与标题栏重叠。
+ */
+@media (max-width: 560px) {
+  .game-resource-search {
+    width: 100%;
+  }
+}
+
 @media (max-width: 620px) {
   .game-resource-recovery-item,
   .game-resource-recovery-error {
diff --git a/apps/ai-game-creator-shell/src/view/project-development/index.tsx b/apps/ai-game-creator-shell/src/view/project-development/index.tsx
index 8c8522fb9..b6fde1e08 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/index.tsx
+++ b/apps/ai-game-creator-shell/src/view/project-development/index.tsx
@@ -422,6 +422,21 @@ function resourceCanvasElementSize(element: HTMLElement | null) {
   };
 }
 
+/**
+ * 资源工具条（搜索框、筛选条、状态提示）在管理区顶部占一条独立排布带，画本场景的盒子
+ * 从这条带下面开始。按视口排布资源时要减掉这条带，否则"适应内容"仍按旧的
+ * "场景一直顶到管理区顶端"居中，把卡片排到工具条底下。
+ */
+function resourceCanvasSceneSize(
+  size: { width: number; height: number },
+  chromeHeight: number,
+) {
+  return {
+    width: size.width,
+    height: Math.max(0, size.height - Math.max(0, chromeHeight)),
+  };
+}
+
 function resourceCanvasViewportsEqual(
   left: CanvasViewport,
   right: CanvasViewport,
@@ -1223,6 +1238,11 @@ export default function ProjectDevelopmentView({
       createResourceBookTransitionController(),
     );
   const resourceBookManagerRef = useRef<HTMLDivElement>(null);
+  /**
+   * 工具条带的第一条流式元素（搜索框）。工具条带本身没有独立包裹节点，命中它就能把
+   * "第一条流式元素顶边到管理区顶边"的高度算出来，正好是画本场景要让出的那条带。
+   */
+  const resourceBookToolsRef = useRef<HTMLLabelElement>(null);
   const resourceBookPlanKeysRef = useRef(
     new Map<string, ResourceBookSceneCardPlan>(),
   );
@@ -1236,6 +1256,15 @@ export default function ProjectDevelopmentView({
     width: 900,
     height: 640,
   });
+  const [resourceBookToolsHeight, setResourceBookToolsHeight] = useState(0);
+  /**
+   * 场景局部的可排布尺寸：管理区盒子减掉顶部工具条带。视口居中与"适应内容"都按它算。
+   */
+  const sceneFitCanvasSize = useMemo(
+    () =>
+      resourceCanvasSceneSize(resourceBookSceneSize, resourceBookToolsHeight),
+    [resourceBookSceneSize, resourceBookToolsHeight],
+  );
   const [sortMode, setSortMode] = useState<ResourceSortMode>('dependency');
   const [searchText, setSearchText] = useState('');
   const [resourceCanvasCategoryFilters, setResourceCanvasCategoryFilters] =
@@ -2061,11 +2090,16 @@ export default function ProjectDevelopmentView({
       return;
     }
     const managerRect = manager.getBoundingClientRect();
+    // 画本场景是管理区内缩掉顶部工具条带之后的盒子；总览栏目矩形与场景世界都按它定位。
+    const sceneRect =
+      manager
+        .querySelector<HTMLElement>('.game-resource-book-scene')
+        ?.getBoundingClientRect() ?? managerRect;
     setResourceBookSceneSize((current) =>
-      Math.abs(current.width - managerRect.width) < 0.5 &&
-      Math.abs(current.height - managerRect.height) < 0.5
+      Math.abs(current.width - sceneRect.width) < 0.5 &&
+      Math.abs(current.height - sceneRect.height) < 0.5
         ? current
-        : { width: managerRect.width, height: managerRect.height },
+        : { width: sceneRect.width, height: sceneRect.height },
     );
     const next = new Map<ResourceCategory, ResourceBookOverviewRect>();
     resourceBookThumbnailElementsRef.current.forEach((element, category) => {
@@ -2126,6 +2160,29 @@ export default function ProjectDevelopmentView({
       window.removeEventListener('resize', measureResourceBookOverview);
     };
   }, [measureResourceBookOverview, resourceBookView, canvasResources.length]);
+
+  useLayoutEffect(() => {
+    const tools = resourceBookToolsRef.current;
+    if (!tools) {
+      return undefined;
+    }
+    const measureTools = () => {
+      const height = tools.offsetTop + tools.offsetHeight;
+      setResourceBookToolsHeight((current) =>
+        Math.abs(current - height) < 0.5 ? current : height,
+      );
+    };
+    measureTools();
+    if (typeof ResizeObserver === 'undefined') {
+      window.addEventListener('resize', measureTools);
+      return () => window.removeEventListener('resize', measureTools);
+    }
+    // 工具条会随窗口宽度换行（窄屏下搜索框与筛选条各占一行），高度必须实测：
+    // 场景盒子按它下移，两者才不会落在同一条排布带上。
+    const observer = new ResizeObserver(measureTools);
+    observer.observe(tools);
+    return () => observer.disconnect();
+  }, [mode, resourceBookView, searchText]);
   const viewedResourceCategory =
     mode === 'resources' ? activePageCategory : null;
   useEffect(() => {
@@ -2302,8 +2359,8 @@ export default function ProjectDevelopmentView({
   // 返回总览时也不会跳成另一张图。
   const resourceBookCategoryViewCenters = useMemo(() => {
     const canvasSize =
-      resourceBookSceneSize.width > 0 && resourceBookSceneSize.height > 0
-        ? resourceBookSceneSize
+      sceneFitCanvasSize.width > 0 && sceneFitCanvasSize.height > 0
+        ? sceneFitCanvasSize
         : {
             width: RESOURCE_CANVAS_FALLBACK_WIDTH,
             height: RESOURCE_CANVAS_FALLBACK_HEIGHT,
@@ -2322,7 +2379,7 @@ export default function ProjectDevelopmentView({
         ] as const;
       }),
     );
-  }, [resourceBookSceneSize, resourceCanvasViewports, sortMode]);
+  }, [sceneFitCanvasSize, resourceCanvasViewports, sortMode]);
   const setResourceCanvasViewport = useCallback(
     (
       category: ResourceCategory,
@@ -2815,14 +2872,14 @@ export default function ProjectDevelopmentView({
 
       const categoryFitKey = `${projectPath}\n${manifest.projectId}\n${sortMode}\n${category}`;
       const fitCanvasSize =
-        resourceBookSceneSize.width > 0 && resourceBookSceneSize.height > 0
-          ? resourceBookSceneSize
+        sceneFitCanvasSize.width > 0 && sceneFitCanvasSize.height > 0
+          ? sceneFitCanvasSize
           : {
               width: RESOURCE_CANVAS_FALLBACK_WIDTH,
               height: RESOURCE_CANVAS_FALLBACK_HEIGHT,
             };
       const fitMaxScale =
-        resourceBookSceneSize.width > 0 && resourceBookSceneSize.height > 0
+        sceneFitCanvasSize.width > 0 && sceneFitCanvasSize.height > 0
           ? RESOURCE_CANVAS_BOOK_FIT_MAX_SCALE
           : 1;
       const categoryBounds = resourceCanvasContentBounds(
@@ -2867,7 +2924,7 @@ export default function ProjectDevelopmentView({
       // sort/category pair. Mark that fit as settled so the paged-canvas
       // layout effect does not immediately recalculate it from a shared DOM
       // measurement and overwrite the stored per-category viewport.
-      if (resourceBookSceneSize.width > 0 && resourceBookSceneSize.height > 0) {
+      if (sceneFitCanvasSize.width > 0 && sceneFitCanvasSize.height > 0) {
         resourceCanvasFitKeysRef.current.add(categoryFitKey);
       }
 
@@ -2880,7 +2937,7 @@ export default function ProjectDevelopmentView({
       manifest.projectId,
       projectPath,
       resourceBookState,
-      resourceBookSceneSize,
+      sceneFitCanvasSize,
       resourceCardSizeByResourceId,
       resourcePositionsByCategory,
       setResourceCanvasViewport,
@@ -3825,14 +3882,14 @@ export default function ProjectDevelopmentView({
       activePageCategory,
       fitResourceCanvasViewportToContent({
         bounds: resourceCanvasFitBounds,
-        canvasSize: resourceBookSceneSize,
+        canvasSize: sceneFitCanvasSize,
         padding: RESOURCE_CANVAS_FIT_PADDING,
         maxScale: RESOURCE_CANVAS_BOOK_FIT_MAX_SCALE,
       }),
     );
   }, [
     activePageCategory,
-    resourceBookSceneSize,
+    sceneFitCanvasSize,
     resourceBookView,
     resourceCanvasFitBounds,
     setResourceCanvasViewport,
@@ -3844,7 +3901,8 @@ export default function ProjectDevelopmentView({
       const sceneElement = resourceBookManagerRef.current;
       const rect = sceneElement?.getBoundingClientRect();
       const anchorX = rect ? rect.width / 2 : 0;
-      const anchorY = rect ? rect.height / 2 : 0;
+      // 锚点取真正看得见的画本区域中心：顶部工具条带不算画布。
+      const anchorY = rect ? (rect.height - resourceBookToolsHeight) / 2 : 0;
       if (resourceBookView === 'main') {
         const viewport = resourceBookMainViewportRef.current;
         const next = zoomResourceBookViewport(viewport, factor, {
@@ -3868,7 +3926,12 @@ export default function ProjectDevelopmentView({
       if (next.scale === viewport.scale) return;
       setResourceCanvasViewport(category, next);
     },
-    [activePageCategory, resourceBookView, setResourceCanvasViewport],
+    [
+      activePageCategory,
+      resourceBookToolsHeight,
+      resourceBookView,
+      setResourceCanvasViewport,
+    ],
   );
 
   useLayoutEffect(() => {
@@ -3904,9 +3967,10 @@ export default function ProjectDevelopmentView({
       }
       event.preventDefault();
       const rect = sceneElement.getBoundingClientRect();
+      // 工具条带里没有画布，滚轮锚点先减掉它，缩放才不会以被盖住的区域为中心。
       const screenPoint = {
         x: event.clientX - rect.left,
-        y: event.clientY - rect.top,
+        y: event.clientY - rect.top - resourceBookToolsHeight,
       };
       if (resourceBookView === 'main') {
         const current = resourceBookMainViewportRef.current;
@@ -3938,7 +4002,12 @@ export default function ProjectDevelopmentView({
       });
       setResourceCanvasViewport(category, result.viewport, true);
     },
-    [activePageCategory, resourceBookView, setResourceCanvasViewport],
+    [
+      activePageCategory,
+      resourceBookToolsHeight,
+      resourceBookView,
+      setResourceCanvasViewport,
+    ],
   );
 
   useEffect(() => {
@@ -5735,85 +5804,90 @@ export default function ProjectDevelopmentView({
                     <Maximize2 size={16} aria-hidden="true" />
                   </button>
                 </div>
-                <label className="game-resource-search">
-                  <Search size={16} aria-hidden="true" />
-                  <input
-                    ref={resourceSearchRef}
-                    type="search"
-                    aria-label="搜索项目资源"
-                    value={searchText}
-                    placeholder="搜索资源名称、路径或类型"
-                    onChange={(event) => {
-                      advanceFocusGeneration();
-                      setSearchText(event.currentTarget.value);
-                      setHiddenCommittedResourceId(null);
-                    }}
-                  />
-                </label>
-                <PlatformResourceFilterBar
-                  ariaLabel="资源筛选"
-                  categoryItems={RESOURCE_REFERENCE_FILTERS}
-                  activeCategoryId={resourceCategoryFilter}
-                  onCategoryChange={showResourceCategoryFilter}
-                  tagItems={resourceTagLibrary}
-                  activeTags={resourceCanvasActiveTags}
-                  onToggleTag={(tag) => {
-                    setResourceCanvasActiveTags((current) =>
-                      current.includes(tag)
-                        ? current.filter((item) => item !== tag)
-                        : [...current, tag],
-                    );
-                  }}
-                  className="game-resource-category-filter"
-                />
-                {resourceWorkbenchNotice ? (
-                  <div className="game-resource-live-notice" role="status">
-                    <span>{resourceWorkbenchNotice}</span>
-                    {hiddenCommittedResourceId ? (
-                      <button
-                        type="button"
-                        onClick={() => {
-                          const intent = pendingResourceFocusRef.current;
-                          if (
-                            !intent ||
-                            intent.resourceId !== hiddenCommittedResourceId
-                          ) {
-                            return;
-                          }
-                          const focusGeneration = advanceFocusGeneration();
-                          pendingResourceFocusRef.current = {
-                            ...intent,
-                            focusGeneration,
-                            completed: false,
-                          };
-                          setSearchText('');
-                          setHiddenCommittedResourceId(null);
-                          setResourceWorkbenchNotice('正在定位新资源…');
-                        }}
-                      >
-                        清除搜索并定位
-                      </button>
-                    ) : null}
-                  </div>
-                ) : null}
-                {attachments.some(
-                  (attachment) => attachment.status === 'failed',
-                ) ? (
-                  <section
-                    className="game-attachment-errors"
-                    aria-label="附件导入失败"
-                    role="status"
+                <div className="game-resource-book-tools">
+                  <label
+                    ref={resourceBookToolsRef}
+                    className="game-resource-search"
                   >
-                    {attachments
-                      .filter((attachment) => attachment.status === 'failed')
-                      .map((attachment) => (
-                        <p key={`${attachment.fileName}:${attachment.error}`}>
-                          <strong>{attachment.fileName}</strong>
-                          <span>{attachment.error || '附件导入失败'}</span>
-                        </p>
-                      ))}
-                  </section>
-                ) : null}
+                    <Search size={16} aria-hidden="true" />
+                    <input
+                      ref={resourceSearchRef}
+                      type="search"
+                      aria-label="搜索项目资源"
+                      value={searchText}
+                      placeholder="搜索资源名称、路径或类型"
+                      onChange={(event) => {
+                        advanceFocusGeneration();
+                        setSearchText(event.currentTarget.value);
+                        setHiddenCommittedResourceId(null);
+                      }}
+                    />
+                  </label>
+                  <PlatformResourceFilterBar
+                    ariaLabel="资源筛选"
+                    categoryItems={RESOURCE_REFERENCE_FILTERS}
+                    activeCategoryId={resourceCategoryFilter}
+                    onCategoryChange={showResourceCategoryFilter}
+                    tagItems={resourceTagLibrary}
+                    activeTags={resourceCanvasActiveTags}
+                    onToggleTag={(tag) => {
+                      setResourceCanvasActiveTags((current) =>
+                        current.includes(tag)
+                          ? current.filter((item) => item !== tag)
+                          : [...current, tag],
+                      );
+                    }}
+                    className="game-resource-category-filter"
+                  />
+                  {resourceWorkbenchNotice ? (
+                    <div className="game-resource-live-notice" role="status">
+                      <span>{resourceWorkbenchNotice}</span>
+                      {hiddenCommittedResourceId ? (
+                        <button
+                          type="button"
+                          onClick={() => {
+                            const intent = pendingResourceFocusRef.current;
+                            if (
+                              !intent ||
+                              intent.resourceId !== hiddenCommittedResourceId
+                            ) {
+                              return;
+                            }
+                            const focusGeneration = advanceFocusGeneration();
+                            pendingResourceFocusRef.current = {
+                              ...intent,
+                              focusGeneration,
+                              completed: false,
+                            };
+                            setSearchText('');
+                            setHiddenCommittedResourceId(null);
+                            setResourceWorkbenchNotice('正在定位新资源…');
+                          }}
+                        >
+                          清除搜索并定位
+                        </button>
+                      ) : null}
+                    </div>
+                  ) : null}
+                  {attachments.some(
+                    (attachment) => attachment.status === 'failed',
+                  ) ? (
+                    <section
+                      className="game-attachment-errors"
+                      aria-label="附件导入失败"
+                      role="status"
+                    >
+                      {attachments
+                        .filter((attachment) => attachment.status === 'failed')
+                        .map((attachment) => (
+                          <p key={`${attachment.fileName}:${attachment.error}`}>
+                            <strong>{attachment.fileName}</strong>
+                            <span>{attachment.error || '附件导入失败'}</span>
+                          </p>
+                        ))}
+                    </section>
+                  ) : null}
+                </div>
                 <section
                   className={`game-resource-book-main${resourceBookState.view === 'child' ? ' is-background' : ''}`}
                   aria-label="资源总览"
diff --git a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
index 8d22f2f3d..1631f2068 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
@@ -1191,22 +1191,32 @@ export function registerProjectWorkbenchFoundationTests() {
 
     // 但"在场景之上"只是不被盖住，不等于两者不重叠：上一版把搜索框常态居中浮在画本顶上，
     // 分页态栏目标题栏正好被压在同一水平带上。所以还要钉住"工具条带独占顶部那条带"。
-    const scene = styleRuleBody(styles, '\\.game-resource-book-scene');
-    expect(scene).toMatch(/inset:\s*var\(--game-resource-book-tools-height\)/u);
-
-    // 管理区给工具条带留出的高度与场景让出的顶边必须是同一个变量，否则两者会再次互相压住。
-    const manager = styleRuleBody(styles, '\\.game-resource-manager');
+    //
+    // 不重叠由两条声明级约定保证，缺一条就会退回重叠：
+    //   1. 管理区按实测的工具条带高度留出 padding-top；
+    //   2. 画本场景把自己的顶边按同一个变量下移。
+    // 两条都指向 `--game-resource-book-tools-height`，所以断言两边用的是同一个变量，
+    // 而不是各写各的数字（写死数字时任何一处改动都会重新压住搜索框）。
+    const toolsHeightVariable = '--game-resource-book-tools-height';
+    // 选择器前缀加行首断言：`.game-workbench-stage > .game-resource-manager` 这种
+    // 后代选择器里也含同名类，不加断言会取到那条只有 grid-row 的规则。
+    const manager = styleRuleBody(styles, '(?:^|\\n)\\.game-resource-manager');
     expect(manager).toMatch(
-      /padding-top:\s*var\(--game-resource-book-tools-height\)/u,
+      new RegExp(`padding-top:\\s*var\\(${toolsHeightVariable}`, 'u'),
     );
 
+    const scene = styleRuleBody(styles, '\\.game-resource-book-scene');
+    expect(scene).toMatch(
+      new RegExp(`inset:\\s*var\\(${toolsHeightVariable}`, 'u'),
+    );
+    // 场景只让出顶边：宽度与底边必须仍是 0，否则画本区域会缩成一条缝。
+    expect(scene).toMatch(/inset:\s*var\([^)]*\)\s+0\s+0;/u);
+
     // 工具条带是绝对定位的独立排布行，不是流内浮层；搜索框按整行宽度算，
-    // 不与任何栏目标题栏共享同一水平带。
+    // 不与任何栏目标题栏共享同一水平带（分页态标题栏 z-index 30 < 工具条带 40）。
     const tools = styleRuleBody(styles, '\\.game-resource-book-tools');
     expect(tools).toMatch(/position:\s*absolute/u);
     expect(styleNumber(tools, 'top')).toBe(0);
-
-    // 搜到的是场景里真正的栏目标题栏（分页态被激活时铺满整行），它必须整体排在工具条带下面。
     const titlebar = styleRuleBody(
       styles,
       '\\.game-resource-book-scene-titlebar',
@@ -1215,8 +1225,11 @@ export function registerProjectWorkbenchFoundationTests() {
       styleNumber(tools, 'z-index'),
     );
 
-    expect(tsxSource).toContain('game-resource-book-tools');
-    expect(tsxSource).not.toContain('game-resource-book-scene-titlebar');
+    // 结构上搜索框必须待在工具条带里：离开这条带就又会浮回画本顶部。
+    const toolsTag = tsxSource.indexOf('game-resource-book-tools');
+    const searchTag = tsxSource.indexOf('game-resource-search');
+    expect(toolsTag).toBeGreaterThan(-1);
+    expect(searchTag).toBeGreaterThan(toolsTag);
   });
 
   it('keeps the outline dock readable without hover', () => {
@@ -1325,6 +1338,34 @@ export function registerProjectWorkbenchFoundationTests() {
         .getByRole('button', { name: '角色与对象' })
         .getAttribute('aria-current'),
     ).toBe('page');
+
+    // 搜索框与栏目标题栏分属两条排布带，这不是 CSS 声明能表达的：画本场景是管理区里
+    // 铺满整块的绝对定位层，搜索框只要还在场景内部，就一定会被栏目标题栏压在同一个
+    // 水平带上。所以这里钉住渲染出来的 DOM 归属关系。
+    const searchLabel = screen.getByLabelText('搜索项目资源').closest('label');
+    expect(searchLabel?.className).toContain('game-resource-search');
+
+    const toolsBand = searchLabel?.parentElement ?? null;
+    expect(toolsBand?.className).toContain('game-resource-book-tools');
+
+    const manager = toolsBand?.parentElement ?? null;
+    expect(manager?.className).toContain('game-resource-manager');
+
+    // 画本场景是管理区里铺满整块的绝对定位层：搜索框只要落在它内部，就会被栏目标题栏
+    // 压在同一个水平带上。入场动画会替换场景节点，所以这里用祖先链判断归属关系，
+    // 不依赖某一个具体节点的身份，也不受节点替换影响。
+    // 从父节点起算：label 自己就带 `game-resource-search`，closest 要排除自身。
+    const searchAncestors = searchLabel?.parentElement ?? null;
+    expect(searchAncestors?.closest('.game-resource-book-scene')).toBeNull();
+    expect(searchAncestors?.closest('.game-resource-book-main')).toBeNull();
+    expect(searchAncestors?.closest('.game-resource-book-tools')).toBe(
+      toolsBand,
+    );
+    // 两条排布带在管理区里是并列的：搜索框所在的工具条带与画本场景各占一条。
+    expect(toolsBand?.parentElement).toBe(manager);
+    expect(
+      manager?.querySelector(':scope > .game-resource-book-scene'),
+    ).not.toBeNull();
   });
 
   it('keeps the shared selection overlay colours resolvable from the scene root', () => {