diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.test.ts b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.test.ts
index 58a236cc5..7f53aa62c 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.test.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.test.ts
@@ -12,6 +12,9 @@ import {
 
 type StubRect = { top: number; bottom: number };
 
+/** 一个锚点候选块：回合 key 与稳定块身份，对应 DOM 上的 `data-turn-key` / `data-block-key`。 */
+type BlockSpec = readonly [turnKey: string, blockKey: string];
+
 /** jsdom 不做布局：每个块的屏幕位置都由用例显式给出。 */
 function stubRect(element: HTMLElement, rect: StubRect): void {
   element.getBoundingClientRect = () =>
@@ -29,14 +32,15 @@ function stubRect(element: HTMLElement, rect: StubRect): void {
 }
 
 function buildList(
-  keys: readonly string[],
+  specs: readonly BlockSpec[],
   listRect: StubRect = { top: 0, bottom: 400 },
 ) {
   document.body.innerHTML = '';
   const list = document.createElement('div');
-  for (const key of keys) {
+  for (const [turnKey, blockKey] of specs) {
     const block = document.createElement('div');
-    block.dataset.turnKey = key;
+    block.dataset.turnKey = turnKey;
+    block.dataset.blockKey = blockKey;
     list.appendChild(block);
   }
   document.body.appendChild(list);
@@ -49,13 +53,30 @@ afterEach(() => {
 });
 
 describe('collectTurnBlocks', () => {
-  it('按文档顺序收集所有带回合身份的块', () => {
-    const { list } = buildList(['t1', 't2']);
+  it('按文档顺序收集所有可锚定的块', () => {
+    const { list } = buildList([
+      ['t1', 'b1'],
+      ['t2', 'b2'],
+    ]);
     expect(collectTurnBlocks(list)).toHaveLength(2);
   });
 
+  it('只收集同时带回合 key 与块身份的块', () => {
+    const { list } = buildList([['t1', 'b1']]);
+    // 有回合 key、没有块身份：定位不到它，读锚点时也会被跳过，干脆不进候选集合。
+    const keyOnly = document.createElement('div');
+    keyOnly.dataset.turnKey = 't1';
+    list.appendChild(keyOnly);
+    invalidateTurnBlocks(list);
+
+    expect(collectTurnBlocks(list)).toHaveLength(1);
+  });
+
   it('同一列表连续收集只查一次 DOM', () => {
-    const { list } = buildList(['t1', 't2']);
+    const { list } = buildList([
+      ['t1', 'b1'],
+      ['t2', 'b2'],
+    ]);
     collectTurnBlocks(list);
     const query = vi.spyOn(list, 'querySelectorAll');
 
@@ -67,10 +88,11 @@ describe('collectTurnBlocks', () => {
   });
 
   it('子元素变化并失效后重新收集', () => {
-    const { list } = buildList(['t1']);
+    const { list } = buildList([['t1', 'b1']]);
     const before = collectTurnBlocks(list);
     const extra = document.createElement('div');
     extra.dataset.turnKey = 't2';
+    extra.dataset.blockKey = 'b2';
     list.appendChild(extra);
 
     invalidateTurnBlocks(list);
@@ -83,7 +105,11 @@ describe('collectTurnBlocks', () => {
 
 describe('readTopVisibleTurnAnchor', () => {
   it('跳过完全滚出顶部的块，取第一条真正露出的块', () => {
-    const { list, blocks } = buildList(['t1', 't2', 't3']);
+    const { list, blocks } = buildList([
+      ['t1', 'b1'],
+      ['t2', 'b2'],
+      ['t3', 'b3'],
+    ]);
     stubRect(blocks[0]!, { top: -120, bottom: -100 });
     stubRect(blocks[1]!, { top: -10, bottom: 30 });
     stubRect(blocks[2]!, { top: 40, bottom: 90 });
@@ -91,58 +117,156 @@ describe('readTopVisibleTurnAnchor', () => {
     // 半条消息也算"正在读的位置"：锚点必须是它，拿下一整条会把半条顶出视口。
     expect(readTopVisibleTurnAnchor(list)).toEqual({
       key: 't2',
-      index: 0,
+      blockKey: 'b2',
       offset: -10,
     });
   });
 
-  it('同一个回合的第二个块露出时序号是 1', () => {
-    const { list, blocks } = buildList(['t1', 't2', 't2']);
+  it('同一个回合的第二个块露出时取的是它自己的块身份', () => {
+    const { list, blocks } = buildList([
+      ['t1', 'b1'],
+      ['t2', 'b2'],
+      ['t2', 'b3'],
+    ]);
     stubRect(blocks[0]!, { top: -200, bottom: -150 });
     stubRect(blocks[1]!, { top: -140, bottom: -60 });
     stubRect(blocks[2]!, { top: -20, bottom: 40 });
 
     expect(readTopVisibleTurnAnchor(list)).toEqual({
       key: 't2',
-      index: 1,
+      blockKey: 'b3',
       offset: -20,
     });
   });
 
+  it('收起的 details 里的块没有布局盒：不拿它当锚点', () => {
+    const { list, blocks } = buildList([
+      ['t2', 'process'],
+      ['t2', 'g1'],
+    ]);
+    stubRect(blocks[0]!, { top: 100, bottom: 130 });
+    // 被折进收起 `<details>` 的块在真实浏览器里矩形全 0：它既不是用户正在读的位置，
+    // 也当不了还原基准。
+    stubRect(blocks[1]!, { top: 0, bottom: 0 });
+
+    expect(readTopVisibleTurnAnchor(list)).toEqual({
+      key: 't2',
+      blockKey: 'process',
+      offset: 100,
+    });
+  });
+
   it('列表里没有块露出视口时没有锚点', () => {
-    const { list, blocks } = buildList(['t1']);
+    const { list, blocks } = buildList([['t1', 'b1']]);
     stubRect(blocks[0]!, { top: -50, bottom: -10 });
     expect(readTopVisibleTurnAnchor(list)).toBeNull();
   });
 });
 
 describe('findTurnBlock', () => {
-  it('按回合 key 与块序号定位', () => {
-    const { list, blocks } = buildList(['t1', 't2', 't2']);
-    expect(findTurnBlock(list, 't2', 0)).toBe(blocks[1]);
-    expect(findTurnBlock(list, 't2', 1)).toBe(blocks[2]);
-    expect(findTurnBlock(list, 't2', 2)).toBeNull();
+  it('按回合 key 与块身份定位', () => {
+    const { list, blocks } = buildList([
+      ['t1', 'b1'],
+      ['t2', 'b2'],
+      ['t2', 'b3'],
+    ]);
+    expect(findTurnBlock(list, 't2', 'b3')).toBe(blocks[2]);
+    expect(findTurnBlock(list, 't2', 'missing')).toBeNull();
+    expect(findTurnBlock(list, 'missing', 'b2')).toBeNull();
+  });
+
+  it('块序号变了不影响定位：收口把过程折进 details，序号整体后移', () => {
+    const finished = buildList([
+      ['t2', 'u'],
+      ['t2', 'process'],
+      ['t2', 'g1'],
+      ['t2', 'g2'],
+      ['t2', 'f'],
+      ['t2', 'usage'],
+    ]);
+
+    // 按序号定位的实现会拿第 2 个块当 g2，而收口后它已经是 g1。
+    expect(finished.blocks[2]!.dataset.blockKey).toBe('g1');
+    expect(findTurnBlock(finished.list, 't2', 'g2')).toBe(finished.blocks[3]);
   });
 });
 
 describe('restoreTurnAnchor', () => {
   it('按块当前位置差改 scrollTop，让锚点回到原来的偏移', () => {
-    const { list, blocks } = buildList(['t1', 't2']);
+    const { list, blocks } = buildList([
+      ['t1', 'b1'],
+      ['t2', 'b2'],
+    ]);
     // 更早历史插进来之后，原本贴在视口顶边的 t2 被顶到下方 90px。
     stubRect(blocks[1]!, { top: 90, bottom: 140 });
     list.scrollTop = 0;
-    const anchor: ConversationTurnAnchor = { key: 't2', index: 0, offset: -10 };
+    const anchor: ConversationTurnAnchor = {
+      key: 't2',
+      blockKey: 'b2',
+      offset: -10,
+    };
 
     expect(restoreTurnAnchor(list, anchor)).toBe(true);
     expect(list.scrollTop).toBe(100);
   });
 
-  it('锚点对应的块已经不在了：返回 false，不动 scrollTop', () => {
-    const { list } = buildList(['t1']);
+  it('锚点块被折进收起的 details（没有布局盒）：返回 false，不动 scrollTop', () => {
+    const { list, blocks } = buildList([
+      ['t2', 'u'],
+      ['t2', 'process'],
+      ['t2', 'g1'],
+    ]);
+    stubRect(blocks[0]!, { top: -200, bottom: -150 });
+    stubRect(blocks[1]!, { top: -100, bottom: -70 });
+    stubRect(blocks[2]!, { top: 0, bottom: 0 });
     list.scrollTop = 30;
 
     expect(
-      restoreTurnAnchor(list, { key: 'missing', index: 0, offset: -10 }),
+      restoreTurnAnchor(list, { key: 't2', blockKey: 'g1', offset: -10 }),
+    ).toBe(false);
+    expect(list.scrollTop).toBe(30);
+  });
+
+  it('回合收口后按块身份仍还原到同一个块', () => {
+    const running = buildList([
+      ['t2', 'u'],
+      ['t2', 'g1'],
+      ['t2', 'g2'],
+    ]);
+    stubRect(running.blocks[0]!, { top: -200, bottom: -150 });
+    stubRect(running.blocks[1]!, { top: -140, bottom: -60 });
+    stubRect(running.blocks[2]!, { top: -20, bottom: 40 });
+    const anchor = readTopVisibleTurnAnchor(running.list);
+    expect(anchor).toEqual({ key: 't2', blockKey: 'g2', offset: -20 });
+
+    // 收口：过程折进 details，g2 的块序号从 1 变成 3；用户把过程展开后它有真实几何。
+    const finished = buildList([
+      ['t2', 'u'],
+      ['t2', 'process'],
+      ['t2', 'g1'],
+      ['t2', 'g2'],
+      ['t2', 'f'],
+      ['t2', 'usage'],
+    ]);
+    stubRect(finished.blocks[0]!, { top: -200, bottom: -150 });
+    stubRect(finished.blocks[1]!, { top: -120, bottom: -90 });
+    stubRect(finished.blocks[2]!, { top: -80, bottom: -20 });
+    stubRect(finished.blocks[3]!, { top: 150, bottom: 250 });
+    stubRect(finished.blocks[4]!, { top: 260, bottom: 300 });
+    stubRect(finished.blocks[5]!, { top: 310, bottom: 340 });
+    finished.list.scrollTop = 0;
+
+    expect(restoreTurnAnchor(finished.list, anchor!)).toBe(true);
+    // 150 - 0 - (-20)：按 g2 自己的位置算；按序号会错用 g1 的 -80，写出一副跳动的画面。
+    expect(finished.list.scrollTop).toBe(170);
+  });
+
+  it('锚点对应的块已经不在了：返回 false，不动 scrollTop', () => {
+    const { list } = buildList([['t1', 'b1']]);
+    list.scrollTop = 30;
+
+    expect(
+      restoreTurnAnchor(list, { key: 'missing', blockKey: 'b1', offset: -10 }),
     ).toBe(false);
     expect(list.scrollTop).toBe(30);
   });
diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.ts b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.ts
index 4511247e6..765104d5a 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/conversationScrollAnchor.ts
@@ -1,9 +1,18 @@
 /**
  * 更早历史前插时的视口锚点：读取与还原。
  *
- * 锚点粒度是「回合 key（`data-turn-key`）+ 该回合内的块序号 + 相对列表顶边的像素偏移」：
- * 合并更早历史只会把新回合插在更早的位置，已有回合的 key、块序号和块内结构都不变，所以这个
- * 锚点跨前插稳定。还原只改 `scrollTop`，不做任何 DOM 变更。
+ * 锚点粒度是「回合 key（`data-turn-key`）+ 块身份（`data-block-key`）+ 相对列表顶边的像素偏移」。
+ * 块身份就是 `DirectChatBlock.key`（条目块是 `${回合 key}:${条目 itemId}`，本地说明块是
+ * `messageId`），只要求在同一回合内唯一；「执行过程」包装块与终态文案各有一个回合内唯一的
+ * 字面量块身份（见 `DirectProjectTurn.tsx`）。
+ *
+ * 为什么不存块序号：`DirectProjectTurn` 对运行中的回合把过程块平铺、对已结束的回合把它们折进
+ * 一个 `<details>`，收口时整个回合的块序号都会后移（`[用户, 工具组1, 工具组2]` →
+ * `[用户, 执行过程, 工具组1, 工具组2, 终态正文, 终态文案]`），序号锚点会解析到隔壁块。
+ * 合并更早历史只把新回合插在更早的位置，块身份跨前插稳定。还原只改 `scrollTop`。
+ *
+ * 块没有布局盒（被折进**收起**的 `<details>`、或已不可见）时不参与：读锚点时跳过它，还原时
+ * 直接判失败（返回 false），由调用方按当前位置重新起锚，而不是拿 0 当基准写 `scrollTop`。
  *
  * 为什么不用浏览器原生 scroll anchoring：原生补偿只能让"当前可见内容"不动，做不到「跟随时
  * 展开要贴底」，两套补偿同时生效还会互相抵消；列表因此显式关闭原生锚定，补偿只走这一份。
@@ -12,13 +21,14 @@
 export type ConversationTurnAnchor = {
   /** 回合身份：`DirectChatTurn.key`。 */
   key: string;
-  /** 同一个回合里的第几个块（`data-turn-key` 相同的节点按文档顺序编号）。 */
-  index: number;
+  /** 块身份：`data-block-key`，同一个回合内唯一。 */
+  blockKey: string;
   /** 该块顶边相对列表顶边的偏移，可为负。 */
   offset: number;
 };
 
-const TURN_BLOCK_SELECTOR = '[data-turn-key]';
+/** 可锚定的块：同时带回合 key 与块身份。两者缺一都定位不回来，干脆不进候选集合。 */
+const TURN_BLOCK_SELECTOR = '[data-turn-key][data-block-key]';
 
 function turnKeyOf(element: Element): string | null {
   return element instanceof HTMLElement
@@ -49,16 +59,18 @@ export function invalidateTurnBlocks(list: HTMLElement): void {
   turnBlockCache.delete(list);
 }
 
-/** 按「回合 key + 块序号」定位具体块；找不到返回 null。 */
+/** 按「回合 key + 块身份」定位具体块；找不到返回 null。 */
 export function findTurnBlock(
   list: HTMLElement,
   key: string,
-  index: number,
+  blockKey: string,
 ): HTMLElement | null {
-  const blocks = collectTurnBlocks(list).filter(
-    (block) => turnKeyOf(block) === key,
+  return (
+    collectTurnBlocks(list).find(
+      (block) =>
+        turnKeyOf(block) === key && block.dataset.blockKey === blockKey,
+    ) ?? null
   );
-  return blocks[index] ?? null;
 }
 
 /**
@@ -71,21 +83,19 @@ export function readTopVisibleTurnAnchor(
   list: HTMLElement,
 ): ConversationTurnAnchor | null {
   const listTop = list.getBoundingClientRect().top;
-  const blocks = collectTurnBlocks(list);
 
-  for (let position = 0; position < blocks.length; position += 1) {
-    const block = blocks[position]!;
-    if (block.getBoundingClientRect().bottom - listTop <= 0) continue;
+  for (const block of collectTurnBlocks(list)) {
+    const rect = block.getBoundingClientRect();
+    // 折进收起 `<details>` 的块在真实浏览器里没有布局盒（矩形全 0）：它既不是用户正在读的
+    // 位置，也当不了还原基准。
+    if (rect.height <= 0) continue;
+    if (rect.bottom - listTop <= 0) continue;
 
     const key = turnKeyOf(block);
-    if (!key) continue;
+    const blockKey = block.dataset.blockKey;
+    if (!key || !blockKey) continue;
 
-    let index = 0;
-    for (let earlier = 0; earlier < position; earlier += 1) {
-      if (turnKeyOf(blocks[earlier]!) === key) index += 1;
-    }
-
-    return { key, index, offset: block.getBoundingClientRect().top - listTop };
+    return { key, blockKey, offset: rect.top - listTop };
   }
 
   return null;
@@ -94,17 +104,20 @@ export function readTopVisibleTurnAnchor(
 /**
  * 按锚点还原 `scrollTop`，让同一个块回到原来的偏移。
  *
- * 返回是否还原成功：锚点对应的块已经不在列表里时返回 false，调用方可以据此放弃这次补偿，
- * 而不是拿着过期偏移去改 `scrollTop`。
+ * 返回是否还原成功：锚点对应的块已经不在列表里、或它已经被折进收起的 `<details>`（矩形全 0，
+ * 算不出可用偏移）时返回 false，调用方据此拿当前位置重新起锚，而不是拿着过期基准改 `scrollTop`。
  */
 export function restoreTurnAnchor(
   list: HTMLElement,
   anchor: ConversationTurnAnchor,
 ): boolean {
-  const block = findTurnBlock(list, anchor.key, anchor.index);
+  const block = findTurnBlock(list, anchor.key, anchor.blockKey);
   if (!block) return false;
 
   const listTop = list.getBoundingClientRect().top;
-  list.scrollTop += block.getBoundingClientRect().top - listTop - anchor.offset;
+  const rect = block.getBoundingClientRect();
+  if (rect.height <= 0) return false;
+
+  list.scrollTop += rect.top - listTop - anchor.offset;
   return true;
 }
diff --git a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/useConversationScroll.ts b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/useConversationScroll.ts
index f71dc4216..5031106b0 100644
--- a/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/useConversationScroll.ts
+++ b/apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectConversation/useConversationScroll.ts
@@ -178,7 +178,8 @@ export function useConversationScroll({
       }
       return;
     }
-    // 锚点对应的块已经不在了（折叠态换过结构）：拿当前位置重新起锚，别用过期偏移。
+    // 锚点还原失败（块已经不在列表里，或收口后被折进收起的 `<details>`、没有布局盒算不出偏移）：
+    // 拿当前位置重新起锚，别用过期基准写 `scrollTop`；只是这次不自动对齐，不会回跳。
     preserveAnchorRef.current = readTopVisibleTurnAnchor(list);
   }, []);