diff --git a/apps/ai-game-creator-shell/src/styles.css b/apps/ai-game-creator-shell/src/styles.css
index 991d3314e..031b3fe47 100644
--- a/apps/ai-game-creator-shell/src/styles.css
+++ b/apps/ai-game-creator-shell/src/styles.css
@@ -7088,8 +7088,16 @@ iframe.preview-frame {
 /* 审批卡是这一列里唯一没有天花板的成员：Fast GDD 的决定项越多它越高，能把消息列表和运行
    时面板一起挤出可视区。和 `.agent-runtime-status` 一样给它自己的上限加内部滚动，而不是
    让它去挤别人。 */
+/* 这个面不参与 flex 压缩。它自己不会长高：标题栏是固定几行，审批卡下面有自己的
+   max-height 和内滚，所以高度天然有界。让它可压缩的话，`overflow: hidden`（画圆角
+   要的）会把底部切掉——批准后交付行正好在那儿，表现是路径和两个按钮凭空消失。 */
 .game-workbench-chat .plan-gdd-surface {
-  flex: 0 1 auto;
+  flex: 0 0 auto;
+}
+
+/* 只有审批卡在场时才需要「标题栏定高 + 正文占余下」的两行轨道。批准后卡片收掉，
+   面里只剩标题栏，这条声明会给它套上一个不存在的第二行。 */
+.game-workbench-chat .plan-gdd-surface--with-card {
   min-height: 0;
   grid-template-rows: auto minmax(0, 1fr);
 }
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 7c65cfb49..75b65c8cc 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
@@ -816,7 +816,9 @@ export function registerProjectWorkbenchFoundationTests() {
       'workbench-art-viewport-memory',
       '美术资源视口记忆',
     );
-    const codeTask = manifest.tasks.find((task) => task.id === 'code-prototype');
+    const codeTask = manifest.tasks.find(
+      (task) => task.id === 'code-prototype',
+    );
     expect(codeTask).toBeDefined();
     codeTask!.status = 'completed';
     manifest.assets = [
@@ -1114,7 +1116,9 @@ export function registerProjectWorkbenchFoundationTests() {
     ).not.toBeNull();
     fireEvent.click(within(outline).getByRole('button', { name: /设计文档/ }));
 
-    dispatchPageWheel(screen.getByRole('button', { name: /下一页\s*美术资源/ }));
+    dispatchPageWheel(
+      screen.getByRole('button', { name: /下一页\s*美术资源/ }),
+    );
     expect(
       screen.getByRole('region', { name: '美术资源资源画布' }),
     ).not.toBeNull();
@@ -1177,9 +1181,7 @@ export function registerProjectWorkbenchFoundationTests() {
         name: /打开资源详情：设计文档 section\.md/,
       }),
     );
-    expect(
-      screen.getByRole('dialog', { name: 'section.md' }),
-    ).not.toBeNull();
+    expect(screen.getByRole('dialog', { name: 'section.md' })).not.toBeNull();
     dispatchPageWheel(dependencyCanvas);
     expect(
       screen.getByRole('region', { name: '美术资源资源画布' }),
@@ -1321,9 +1323,7 @@ export function registerProjectWorkbenchFoundationTests() {
         }),
       );
     });
-    fireEvent.click(
-      within(outline).getByRole('button', { name: /项目版本/ }),
-    );
+    fireEvent.click(within(outline).getByRole('button', { name: /项目版本/ }));
     await act(async () => {
       await new Promise((resolve) => setTimeout(resolve, 220));
     });
@@ -1331,9 +1331,7 @@ export function registerProjectWorkbenchFoundationTests() {
       screen.getByRole('region', { name: '项目版本资源画布' }),
     ).not.toBeNull();
 
-    fireEvent.click(
-      within(outline).getByRole('button', { name: /设计文档/ }),
-    );
+    fireEvent.click(within(outline).getByRole('button', { name: /设计文档/ }));
     act(() => {
       dependencyCanvas.dispatchEvent(
         new WheelEvent('wheel', {
@@ -3747,10 +3745,7 @@ export function registerProjectWorkbenchFoundationTests() {
       '[data-resource-viewport]',
     );
     const viewportScale = Number(
-      viewportElement
-        ?.getAttribute('data-resource-viewport')
-        ?.split(',')
-        .at(2),
+      viewportElement?.getAttribute('data-resource-viewport')?.split(',').at(2),
     );
     expect(viewportScale).toBeGreaterThan(0);
     const expectedX = Math.round(12 + (-100 - 20) / viewportScale);
@@ -4191,6 +4186,20 @@ export function registerProjectWorkbenchFoundationTests() {
     expect(styles).toMatch(
       /\.game-workbench-chat \.planning-lane-runtime-strip\s*\{[^}]*max-height:\s*clamp\([^)]*\)/s,
     );
+    // 策划面画圆角要 `overflow: hidden`，所以它绝不能参与 flex 压缩：一旦可压缩，被压到
+    // 内容高度以下时裁掉的正是最底下那行——批准后的交付出口（路径 + 两个按钮）就这么
+    // 凭空消失过一次。它也不需要可压缩，审批卡自己有上限和内滚，高度天然有界。
+    const planGddSurfaceRule = styles.match(
+      /\.game-workbench-chat \.plan-gdd-surface\s*\{[^}]*\}/s,
+    );
+    expect(planGddSurfaceRule).not.toBeNull();
+    expect(planGddSurfaceRule?.[0]).toMatch(/flex:\s*0 0 auto/);
+    // 「标题栏定高 + 正文占余下」的两行轨道只在审批卡在场时成立；批准后面里只剩标题栏，
+    // 套上不存在的第二行只会让它错位。
+    expect(planGddSurfaceRule?.[0]).not.toMatch(/grid-template-rows/);
+    expect(styles).toMatch(
+      /\.game-workbench-chat \.plan-gdd-surface--with-card\s*\{[^}]*grid-template-rows:\s*auto minmax\(0, 1fr\)/s,
+    );
     expect(styles).toMatch(
       /\.game-workbench-chat \.project-runtime-summary\s*\{[^}]*position:\s*sticky[^}]*top:\s*-10px/s,
     );