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diff --git a/reports/bridge-entry-view-20260925/index.html b/reports/bridge-entry-view-20260925/index.html
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index 0000000..0f1bba5
--- /dev/null
+++ b/reports/bridge-entry-view-20260925/index.html
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+<!doctype html>
+<html lang="zh-CN">
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+<title>005–008 播放方式与复位视角检查</title>
+<style>
+*{box-sizing:border-box}body{margin:0;background:#f2f7f5;color:#193c35;font:15px/1.7 system-ui,sans-serif}main{max-width:1500px;margin:auto;padding:32px}h1{font-size:28px;margin:0 0 12px}h2{font-size:21px;margin:0 0 16px}p{margin:10px 0}a{color:#00866c}section,.summary{background:white;border:1px solid #d2e2dc;border-radius:12px;padding:24px;margin-bottom:24px}.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}figure{margin:0}figcaption{margin-bottom:8px;color:#526d65}img{display:block;width:100%;border:1px solid #d2e2dc;border-radius:6px}details{margin-top:18px}summary{cursor:pointer;color:#00866c}code{font-size:13px;overflow-wrap:anywhere}.note{color:#526d65;font-size:13px}@media(max-width:900px){main{padding:16px}.grid{grid-template-columns:1fr}}
+</style>
+<main>
+<h1>005–008 播放方式与复位视角检查</h1>
+<p>2026-09-25 · 本地开发环境 · 正式教员预览入口</p>
+<div class="summary">
+<p>进入背景页、切换讲解页、进入操作步骤时默认不播放数字人视频。点击“播放讲解”后才开始；操作阶段可自行开启“自动语音”。</p>
+<p>顶部教员预览标签最大宽度统一为 300px，超长显示省略号，悬停可看完整内容。窄屏沿用现有的标签隐藏布局。</p>
+<p>005–008 按主车实际可见表面调整初始与复位视角，缩小多余留白。部件聚焦保持原来的行为；006 同时限制保障车不能超出画面边界，小屏优先保留双车全景。</p>
+<p>浏览器检查覆盖：初始视频暂停且进度为 0、进入操作不自动播放、手动播放可用、下一页保持暂停、聚焦后复位比例一致、预览未完成任何操作步骤、无页面脚本异常。</p>
+<p>桌面：1920 × 945，<code>http://127.0.0.1:6180</code>。笔记本：1366 × 768，<code>http://192.168.31.168:6180</code>。使用 root 教员预览；未提交成绩或修改已发布训练配置。</p>
+<p><a href="result.json">桌面检查结果</a> · <a href="../bridge-entry-view-20260925-laptop/result.json">笔记本检查结果</a></p>
+<p>结果：12 项单元与契约检查通过；四个脚本在桌面与笔记本共 8 组浏览器检查通过；<code>pnpm build</code> 通过。构建保留现有的大文件体积提示，没有构建错误。</p>
+<details><summary>验证命令与范围</summary>
+<p><code>node --test scripts/training-overview.test.mjs scripts/introduction-narration.test.mjs scripts/training-scene-safety.test.mjs scripts/virtual-training-formal-route.contract.test.mjs</code></p>
+<p><code>pnpm build</code>（包含 TypeScript 检查与 legacy 编辑器产物完整性检查）</p>
+<p><code>node tools/bridge-entry-view-live.mjs</code>；笔记本通过 <code>BASE_URL / WIDTH / HEIGHT / REPORT_SUFFIX</code> 环境变量切换。</p>
+<p class="note">浏览器显式允许自动播放，确保测试不会因为浏览器拦截而误判。观察脚本只读取相机与媒体状态，交互使用真实页面按钮。本次覆盖页面进入、媒体播放、部件聚焦与复位，未重新执行所有拆装操作。</p>
+</details>
+</div>
+<div id="scenes"></div>
+<script>
+const tasks=[['86','005 液压泵应急切换'],['87','006 液压泵应急替代'],['88','007 前泵换件修复'],['89','008 平衡阀拆拼互换']];
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+</script>
+</main>
+</html>
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+<!doctype html>
+<html lang="zh-CN">
+<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
+<title>背景与讲解实时 3D、双车取景检查</title>
+<style>
+*{box-sizing:border-box}body{margin:0;background:#f2f7f5;color:#193c35;font:15px/1.75 system-ui,sans-serif}main{max-width:1500px;padding:32px;margin:auto}h1{font-size:28px;margin:0 0 12px}h2{font-size:21px;margin:0 0 14px}p{margin:8px 0}a{color:#00866c}section{background:#fff;border:1px solid #d2e2dc;border-radius:12px;padding:24px;margin:24px 0}.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}figure{margin:0}figcaption{margin-bottom:8px;color:#526d65}img{display:block;width:100%;border:1px solid #d2e2dc;border-radius:6px}details{margin-top:16px}summary{cursor:pointer;color:#00866c}code{font-size:13px;overflow-wrap:anywhere}.note{font-size:13px;color:#526d65}@media(max-width:900px){main{padding:16px}.grid{grid-template-columns:1fr}}
+</style>
+<main>
+<h1>背景与讲解实时 3D、双车取景检查</h1>
+<p>2026-09-25 · 本地开发环境 · 正式教员预览入口</p>
+<section>
+<p>006 默认取景向左调整，主车与支援车分别避让数字教员、右侧工具栏。复位时采用相同布局，窄屏根据剩余空间自动取景。</p>
+<p>005–008 共 11 个背景/讲解页的场景图片，已替换为实时 3D。预览从整车视角开始缓慢旋转，约 3 分钟一圈，可暂停和继续。原有视频类型讲解仍使用视频播放器。</p>
+<p>预览与操作共用已加载的模型、场地、HDR 和 WebGL 画布，使用独立预览相机。进入操作步骤时停止旋转；从部件聚焦返回背景页，再回到操作页，保持原来的操作相机、步骤与零件状态。数字人视频默认仍不自动播放。</p>
+<p>已通过：14 项单元与契约检查；四个脚本在 1920 × 945 桌面和 1366 × 768 笔记本下的浏览器检查；生产构建（含类型检查、legacy 模型编辑器产物校验）。</p>
+<p><a href="result.json">桌面结果</a> · <a href="../bridge-introduction-3d-20260925-laptop/result.json">笔记本结果</a> · <a href="../bridge-introduction-3d-20260925-resize/result.json">全屏与缩放结果</a> · <a href="../bridge-introduction-3d-20260925-laptop-layout/result.json">笔记本全屏与面板展开/收起</a></p>
+<details><summary>环境、检查范围与命令</summary>
+<p>桌面 <code>http://127.0.0.1:6180</code>；笔记本 <code>http://192.168.31.168:6180</code>；沿用 Vite 至 6100 Gateway 的 API 代理。使用 root 教员预览，没有提交成绩或修改场景/训练配置。</p>
+<p><code>node --test scripts/training-overview.test.mjs scripts/introduction-orbit.test.mjs scripts/introduction-narration.test.mjs scripts/training-introduction.test.mjs scripts/virtual-training-formal-route.contract.test.mjs</code></p>
+<p><code>node tools/bridge-introduction-3d-live.mjs</code>；通过 <code>WIDTH / HEIGHT / BASE_URL / REPORT_SUFFIX</code> 切换窗口与地址，通过 <code>CHECK_LAYOUT=1</code> 补查全屏与窗口缩放。</p>
+<p><code>pnpm build</code> 通过。现有的大文件体积提示不影响构建。</p>
+<p class="note">浏览器检查覆盖真实旋转、暂停/继续、所有背景与讲解页、单画布复用、数字人手动播放、返回操作、聚焦视角保留、复位比例与双车遮挡。几何单元测试覆盖整圈旋转的取景范围。没有重新执行全部拆装流程。</p>
+</details>
+</section>
+<section><h2>006：支援车避开面板</h2><div class="grid">
+<figure><figcaption>调整前</figcaption><a href="../bridge-entry-view-20260925/task-87-overview.png"><img src="../bridge-entry-view-20260925/task-87-overview.png" alt="006 调整前，支援车被工具栏遮挡"></a></figure>
+<figure><figcaption>调整后</figcaption><a href="task-87-operation.png"><img src="task-87-operation.png" alt="006 两车避开面板"></a></figure>
+</div></section>
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new file mode 100644
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+++ b/reports/bridge-label-placement-20260925/index.html
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+          "active": false,
+          "anchor": {
+            "x": 955.889131400069,
+            "y": 258.15514092418493
+          },
+          "rect": {
+            "x": 981.765625,
+            "y": 150.359375,
+            "w": 112,
+            "h": 30
+          }
+        },
+        {
+          "id": "bridge-large-plug-2",
+          "text": "大腔油堵 2",
+          "visible": false,
+          "active": false,
+          "anchor": {
+            "x": 954.3641262113431,
+            "y": 259.5073278775327
+          },
+          "rect": {
+            "x": 976.359375,
+            "y": 238.671875,
+            "w": 112,
+            "h": 30
+          }
+        },
+        {
+          "id": "bridge-large-cloth",
+          "text": "大腔清洗擦拭布",
+          "visible": false,
+          "active": false,
+          "anchor": {
+            "x": 948.9811923252504,
+            "y": 257.1919004144232
+          },
+          "rect": {
+            "x": 722.3125,
+            "y": 274.0625,
+            "w": 112,
+            "h": 30
+          }
+        }
+      ],
+      "intro": false,
+      "pending": false,
+      "completed": [],
+      "camera": [
+        3.780050573974555,
+        3.236536384845225,
+        7.195391061259029
+      ]
+    }
+  ],
+  "errors": []
+}
\ No newline at end of file
diff --git a/reports/bridge-label-placement-20260925/task-86-focus.png b/reports/bridge-label-placement-20260925/task-86-focus.png
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diff --git a/reports/bridge-teacher-bubble-20260925/dark-1920.png b/reports/bridge-teacher-bubble-20260925/dark-1920.png
new file mode 100644
index 0000000..3516794
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diff --git a/reports/bridge-teacher-bubble-20260925/light-1366.png b/reports/bridge-teacher-bubble-20260925/light-1366.png
new file mode 100644
index 0000000..84250c1
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diff --git a/reports/bridge-teacher-bubble-20260925/light-1920.png b/reports/bridge-teacher-bubble-20260925/light-1920.png
new file mode 100644
index 0000000..d2aaf04
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diff --git a/reports/bridge-teacher-bubble-20260925/result.json b/reports/bridge-teacher-bubble-20260925/result.json
new file mode 100644
index 0000000..9232d32
--- /dev/null
+++ b/reports/bridge-teacher-bubble-20260925/result.json
@@ -0,0 +1,36 @@
+{
+  "pass": true,
+  "results": [
+    {
+      "theme": "light",
+      "baseUrl": "http://127.0.0.1:6180",
+      "width": 1920,
+      "height": 945,
+      "background": "rgb(255, 255, 255)",
+      "pointer": "rgb(255, 255, 255)",
+      "title": "第1步，停机并初裁牛皮纸。架桥车熄火；按液压泵与取力器结合面形状初步裁剪牛皮纸。",
+      "text": "第1步，停机并初裁牛皮纸。架桥车熄火；按液压泵与取力器结合面形状初步裁剪牛皮纸。"
+    },
+    {
+      "theme": "dark",
+      "baseUrl": "http://127.0.0.1:6180",
+      "width": 1920,
+      "height": 945,
+      "background": "rgb(14, 36, 32)",
+      "pointer": "rgb(14, 36, 32)",
+      "title": "第1步，停机并初裁牛皮纸。架桥车熄火；按液压泵与取力器结合面形状初步裁剪牛皮纸。",
+      "text": "第1步，停机并初裁牛皮纸。架桥车熄火；按液压泵与取力器结合面形状初步裁剪牛皮纸。"
+    },
+    {
+      "theme": "light",
+      "baseUrl": "http://192.168.31.168:6180",
+      "width": 1366,
+      "height": 768,
+      "background": "rgb(255, 255, 255)",
+      "pointer": "rgb(255, 255, 255)",
+      "title": "第1步，停机并初裁牛皮纸。架桥车熄火；按液压泵与取力器结合面形状初步裁剪牛皮纸。",
+      "text": "第1步，停机并初裁牛皮纸。架桥车熄火；按液压泵与取力器结合面形状初步裁剪牛皮纸。"
+    }
+  ],
+  "errors": []
+}
\ No newline at end of file
diff --git a/reports/bridge-workspace-20260925/README.md b/reports/bridge-workspace-20260925/README.md
new file mode 100644
index 0000000..b6d58ae
--- /dev/null
+++ b/reports/bridge-workspace-20260925/README.md
@@ -0,0 +1,29 @@
+# 005～008 虚拟仿真界面验收
+
+对应前端提交：`ca27634`（unreal_tran_web）。
+
+环境：Windows、本地 Gateway 6100、Vite 6180；使用 root 教员预览，未创建学员任务或提交训练成绩。
+
+## 最终结果
+
+- [背景与讲解实时 3D](../bridge-introduction-3d-20260925/index.html)：四个脚本共 11 页，慢速旋转、暂停/恢复、手动播放数字人、进入操作后还原视角。
+- [小屏 3D 检查](../bridge-introduction-3d-20260925-laptop/result.json)：局域网 1366×768。
+- [全屏与缩放](../bridge-introduction-3d-20260925-resize/result.json)、[小屏面板开关](../bridge-introduction-3d-20260925-laptop-layout/result.json)。
+- [部件标签桌面检查](../bridge-label-placement-20260925/index.html)：四脚本、20 个场景状态，包含标签、聚焦、隐藏其他、复位和移动视角。
+- [部件标签小屏检查](../bridge-label-placement-20260925-laptop/index.html)：四脚本、20 个场景状态。
+- [标签稳定性检查](../bridge-label-placement-20260925-stable/index.html)：006 静止视角不闪烁、不反复换位。
+- [数字教员气泡与完整讲解 title](../bridge-teacher-bubble-20260925/result.json)：明暗主题、桌面与小屏。
+
+以上结果均通过。各目录中的 `result.json` 为最终检查结果。
+
+## 前序对照
+
+[进入页面与复位视角](../bridge-entry-view-20260925/index.html) 和 `bridge-entry-view-20260925-before` 为本轮改动前后对照；`-dual` 为双车视角调整过程记录，最新双车效果见 3D 和标签检查。
+
+部分目录保留了调试期间的 `failure.png`，供追溯已修复问题，不代表最终检查失败。
+
+## 提交前验证
+
+同步远端作业指导书提交后，`pnpm build`（含类型检查与模型编辑器产物校验）通过；讲解、相机、标签、正式训练路由及作业指导书流程回归共 19 项通过。构建有已有的包体积提示，不影响构建成功。
+
+本轮验收工具：`tools/bridge-entry-view-live.mjs`、`tools/bridge-introduction-3d-live.mjs`、`tools/bridge-label-placement-live.mjs`。截图和报告中不含登录令牌或密码。
diff --git a/tools/bridge-entry-view-live.mjs b/tools/bridge-entry-view-live.mjs
new file mode 100644
index 0000000..da774db
--- /dev/null
+++ b/tools/bridge-entry-view-live.mjs
@@ -0,0 +1,45 @@
+import fs from 'node:fs';
+import assert from 'node:assert/strict';
+import {chromium,expect} from '@playwright/test';
+import {login} from './role-permissions-live.mjs';
+const baseline=process.env.BASELINE==='1',dir='reports/bridge-entry-view-20260925'+(baseline?'-before':'')+(process.env.REPORT_SUFFIX||'');fs.mkdirSync(dir,{recursive:true});
+const viewport={width:Number(process.env.WIDTH||1920),height:Number(process.env.HEIGHT||945)},baseUrl=process.env.BASE_URL||'http://127.0.0.1:6180';
+const session=await login('root'),checks=[],errors=[];
+const browser=await chromium.launch({channel:'msedge',headless:true,args:['--enable-unsafe-swiftshader','--autoplay-policy=no-user-gesture-required']});
+const page=await browser.newPage({viewport});
+await page.addInitScript(s=>{sessionStorage.setItem('unreal-tran:web:access-token:v1',s.accessToken);sessionStorage.setItem('unreal-tran:web:refresh-token:v1',s.refreshToken);localStorage.setItem('unreal-tran:web:preferences:v1',JSON.stringify({themeMode:'light'}));globalThis.__mediaPlays=[];document.addEventListener('play',ev=>globalThis.__mediaPlays.push({src:ev.target.currentSrc,className:ev.target.className}),true);},session);
+await page.route(/\/src\/features\/virtual-training-legacy\/upstream\/views\/training\.js(?:\?|$)/,async route=>{const response=await route.fetch();await route.fulfill({response,body:await response.text()+`
+globalThis.__entryView=()=>{const e=activeTraining;if(!e?.sceneReady)return null;const r=e.canvas.getBoundingClientRect(),primary=e.viewerPrimaryObject,meshes=[];
+ primary?.traverse(m=>{if(!m.isMesh||m.userData.trainingPickProxy)return;for(let p=m;p;p=p.parent)if(!p.visible)return;const box=m.geometry.boundingBox||(m.geometry.computeBoundingBox(),m.geometry.boundingBox);if(!box)return;for(const x of [box.min.x,box.max.x])for(const y of [box.min.y,box.max.y])for(const z of [box.min.z,box.max.z]){const v=new THREE.Vector3(x,y,z).applyMatrix4(m.matrixWorld).project(e.camera);meshes.push({x:(v.x+1)*r.width/2,y:(1-v.y)*r.height/2});}});
+ const left=Math.min(...meshes.map(p=>p.x)),top=Math.min(...meshes.map(p=>p.y)),right=Math.max(...meshes.map(p=>p.x)),bottom=Math.max(...meshes.map(p=>p.y));
+ return {step:e.session.stepIndex,completed:[...e.session.completed],autoVoice:e.teacherVoiceEnabled,camera:e.camera.position.toArray(),target:e.controls.target.toArray(),zoom:e.camera.zoom,viewport:{x:r.x,y:r.y,w:r.width,h:r.height},area:e.inspection.clearArea(),primary:{x:left,y:top,w:right-left,h:bottom-top},rootBounds:(e.viewerEquipmentRoots||[]).map(o=>({name:o.name,size:new THREE.Box3().setFromObject(o).getSize(new THREE.Vector3()).toArray()})),pending:!!e.viewerCameraTween};};`});});
+page.on('pageerror',error=>errors.push(error.message));
+const snap=()=>page.evaluate(()=>globalThis.__entryView?.());
+const settled=async()=>{await page.waitForTimeout(750);await expect.poll(async()=>(await snap())?.pending,{timeout:15000}).toBe(false);};
+try{
+ for(const id of (process.env.TASK_IDS||'86,87,88,89').split(',')){
+  await page.goto(baseUrl+'/teaching/virtual-training/preview/'+id);
+  await expect.poll(async()=>Boolean(await snap()),{timeout:120000}).toBe(true);await page.waitForTimeout(1600);
+  const overlay=page.locator('.training-introduction'),media=overlay.locator('video');
+  const initial={task:id,view:'entry',snapshot:await snap(),media:await media.evaluate(v=>({paused:v.paused,time:v.currentTime})),badge:await page.locator('.training-preview-badge').evaluate(el=>({max:getComputedStyle(el).maxWidth,width:el.getBoundingClientRect().width,title:el.title}))};
+  checks.push(initial);await page.screenshot({path:`${dir}/task-${id}-entry.png`});
+  if(!baseline){assert.equal(initial.media.paused,true);assert.equal(initial.media.time,0);assert.equal(initial.snapshot.autoVoice,false);assert.equal(initial.badge.max,'300px');assert.ok(initial.badge.width<=300);assert.deepEqual(await page.evaluate(()=>globalThis.__mediaPlays),[]);}
+  await overlay.locator('[data-intro-command="skip"]').click();await settled();await page.waitForTimeout(900);
+  if(!baseline)assert.equal(await page.locator('.training-server-video').evaluate(v=>v.paused),true,'entering operation remains silent');
+  checks.push({task:id,view:'overview',snapshot:await snap()});await page.screenshot({path:`${dir}/task-${id}-overview.png`});
+  await page.locator('[data-role="part-label"]').click();await settled();
+  await page.locator('[data-action="reset-view"]').click();await settled();
+  checks.push({task:id,view:'reset',snapshot:await snap()});await page.screenshot({path:`${dir}/task-${id}-reset.png`});
+  if(!baseline){
+   const current=await snap(),initialView=checks.find(c=>c.task===id&&c.view==='overview').snapshot;
+   assert.ok(Math.abs(current.primary.w-initialView.primary.w)<2,'reset and overview scale match');assert.deepEqual(current.completed,[]);
+   await page.locator('[data-action="teacher-speak"]').click();await expect.poll(()=>page.locator('.training-server-video').evaluate(v=>v.currentTime),{timeout:30000}).toBeGreaterThan(.1);
+   await page.locator('[data-intro-page="0"]').click();await page.waitForTimeout(700);assert.equal(await media.evaluate(v=>v.paused&&v.currentTime===0),true);
+   await overlay.locator('[data-intro-media="toggle"]').click();await expect.poll(()=>media.evaluate(v=>v.currentTime),{timeout:30000}).toBeGreaterThan(.1);
+   await overlay.locator('[data-intro-command="next"]').click();await page.waitForTimeout(700);
+   assert.equal(await page.locator('video').evaluateAll(videos=>videos.every(v=>v.paused)),true,'next page never auto starts');
+  }
+  console.log('PASS entry view',id);
+ }
+ assert.deepEqual(errors,[]);fs.writeFileSync(dir+'/result.json',JSON.stringify({pass:true,baseline,baseUrl,viewport,accountRole:'root',serverMutations:[],checks,errors},null,2));
+}catch(error){await page.screenshot({path:dir+'/failure.png'}).catch(()=>{});fs.writeFileSync(dir+'/result.json',JSON.stringify({pass:false,error:error.stack,checks,errors,snapshot:await snap().catch(()=>null)},null,2));throw error;}finally{await browser.close();}
diff --git a/tools/bridge-introduction-3d-live.mjs b/tools/bridge-introduction-3d-live.mjs
new file mode 100644
index 0000000..97c35a1
--- /dev/null
+++ b/tools/bridge-introduction-3d-live.mjs
@@ -0,0 +1,87 @@
+import fs from 'node:fs';
+import assert from 'node:assert/strict';
+import { chromium, expect } from '@playwright/test';
+import { login } from './role-permissions-live.mjs';
+
+const baseUrl=process.env.BASE_URL||'http://127.0.0.1:6180',viewport={width:Number(process.env.WIDTH||1920),height:Number(process.env.HEIGHT||945)};
+const dir='reports/bridge-introduction-3d-20260925'+(process.env.REPORT_SUFFIX||'');fs.mkdirSync(dir,{recursive:true});
+const session=await login('root'),checks=[],errors=[];
+const browser=await chromium.launch({channel:'msedge',headless:true,args:['--enable-unsafe-swiftshader','--autoplay-policy=no-user-gesture-required']});
+const page=await browser.newPage({viewport});
+await page.addInitScript(s=>{
+ sessionStorage.setItem('unreal-tran:web:access-token:v1',s.accessToken);sessionStorage.setItem('unreal-tran:web:refresh-token:v1',s.refreshToken);
+ localStorage.setItem('unreal-tran:web:preferences:v1',JSON.stringify({themeMode:'light'}));
+},session);
+await page.route(/\/src\/features\/virtual-training-legacy\/upstream\/views\/training\.js(?:\?|$)/,async route=>{
+ const response=await route.fetch();await route.fulfill({response,body:await response.text()+`
+ globalThis.__introSceneState=(withBounds=false)=>{
+  const e=activeTraining;if(!e?.sceneReady)return null;
+  const p=e.introductionScene,v=e.viewport.getBoundingClientRect();
+  const rect=selector=>{const node=e.viewport.querySelector(selector);if(!node?.getClientRects().length||getComputedStyle(node).visibility==='hidden')return null;const r=node.getBoundingClientRect();return{x:r.x-v.x,y:r.y-v.y,w:r.width,h:r.height};};
+  const objects=withBounds?(e.viewerEquipmentRoots||[]).map(root=>{
+   let x=Infinity,y=Infinity,right=-Infinity,bottom=-Infinity;const point=new THREE.Vector3();root.updateWorldMatrix(true,true);
+   root.traverse(m=>{if(!m.isMesh||m.userData.trainingPickProxy)return;for(let n=m;n;n=n.parent)if(!n.visible)return;
+    const position=m.geometry.attributes.position;for(let i=0;i<position.count;i++){
+     point.fromBufferAttribute(position,i).applyMatrix4(m.matrixWorld).project(e.camera);
+     const px=(point.x+1)*v.width/2,py=(1-point.y)*v.height/2;x=Math.min(x,px);y=Math.min(y,py);right=Math.max(right,px);bottom=Math.max(bottom,py);
+    }
+   });return{name:root.name,x,y,w:right-x,h:bottom-y};
+  }):undefined;
+  return{intro:e.introductionActive,step:e.session.stepIndex,completed:[...e.session.completed],camera:e.camera.position.toArray(),target:e.controls.target.toArray(),zoom:e.camera.zoom,
+   angle:p?.angle,paused:p?.paused,previewCamera:p?.camera?.position.toArray(),canvasInPreview:!!e.canvas.closest('[data-intro-scene]'),sameRenderer:e.renderer.domElement===e.canvas,
+   controlsEnabled:e.controls.enabled,tween:!!e.viewerCameraTween,tools:rect('.training-scene-tools'),teacher:rect('.training-teacher.is-open'),objects};
+ };`});
+});
+page.on('pageerror',error=>errors.push(error.message));
+const snapshot=(bounds=false)=>page.evaluate(b=>globalThis.__introSceneState?.(b),bounds);
+const settled=async()=>{await page.waitForTimeout(800);await expect.poll(async()=>(await snapshot())?.tween,{timeout:20000}).toBe(false);};
+const overlap=(a,b)=>b&&a.x<b.x+b.w&&a.x+a.w>b.x&&a.y<b.y+b.h&&a.y+a.h>b.y;
+try {
+ for(const id of (process.env.TASK_IDS||'86,87,88,89').split(',')){
+  await page.goto(baseUrl+'/teaching/virtual-training/preview/'+id);
+  await expect.poll(async()=>!!(await snapshot())?.previewCamera,{timeout:120000}).toBe(true);
+  const overlay=page.locator('.training-introduction'),canvas=page.locator('.training-canvas');
+  await expect(canvas).toBeVisible();assert.equal(await canvas.count(),1);assert.equal(await page.locator('.introduction-background').count(),0);
+  const initial=await snapshot();assert.equal(initial.sameRenderer,true);assert.equal(initial.controlsEnabled,false);
+  await page.waitForTimeout(1500);const rotated=await snapshot();assert.ok(rotated.angle-initial.angle>.015&&rotated.angle-initial.angle<.2);
+  assert.deepEqual(rotated.camera,initial.camera);assert.deepEqual(rotated.completed,[]);
+  assert.equal(await overlay.locator('video').evaluate(v=>v.paused&&v.currentTime===0),true);
+  await overlay.locator('[data-intro-scene-rotation]').click();const paused=await snapshot();await page.waitForTimeout(500);
+  assert.equal((await snapshot()).angle,paused.angle);await page.screenshot({path:`${dir}/task-${id}-background.png`});
+  await overlay.locator('[data-intro-scene-rotation]').click();
+  if(process.env.CHECK_LAYOUT==='1'){
+   await page.locator('[data-viewer-action="fullscreen"]').click();await page.waitForTimeout(700);
+   await expect(overlay.locator('canvas')).toBeVisible();await page.screenshot({path:`${dir}/task-${id}-fullscreen.png`});
+   await page.locator('[data-viewer-action="fullscreen"]').click();await page.waitForTimeout(700);
+   await page.setViewportSize({width:1366,height:768});await page.waitForTimeout(700);await expect(overlay.locator('canvas')).toBeVisible();
+   await page.setViewportSize(viewport);await page.waitForTimeout(700);
+  }
+  const count=await page.locator('[data-intro-page]').count();
+  for(let i=1;i<count;i++){
+   await page.locator(`[data-intro-page="${i}"]`).click();await expect(overlay.locator('canvas')).toBeVisible();
+   const start=await snapshot();await page.waitForTimeout(400);assert.ok((await snapshot()).angle>start.angle);
+   assert.equal(await overlay.locator('video').evaluate(v=>v.paused),true);
+  }
+  if(count>1)await page.screenshot({path:`${dir}/task-${id}-lecture.png`});
+  await overlay.locator('[data-intro-media="toggle"]').click();await expect.poll(()=>overlay.locator('video').evaluate(v=>v.currentTime),{timeout:30000}).toBeGreaterThan(.1);
+  await overlay.locator('[data-intro-command="skip"]').click();await settled();
+  const operation=await snapshot(true);assert.equal(operation.canvasInPreview,false);assert.equal(operation.controlsEnabled,true);assert.deepEqual(operation.completed,[]);
+  assert.equal(await page.locator('.training-server-video').evaluate(v=>v.paused),true);
+  if(id==='87')for(const object of operation.objects.slice(0,2)){assert.equal(!!overlap(object,operation.tools),false,'vehicle avoids the tools panel');assert.equal(!!overlap(object,operation.teacher),false,'vehicle avoids the teacher');}
+  await page.screenshot({path:`${dir}/task-${id}-operation.png`});
+  if(id==='87'&&process.env.CHECK_LAYOUT==='1')for(let toggle=0;toggle<2;toggle++){
+   await page.locator('[data-viewer-action="tools"]').click();await settled();const layout=await snapshot(true);
+   for(const object of layout.objects.slice(0,2)){assert.equal(!!overlap(object,layout.tools),false,'panel toggle keeps both vehicles clear');assert.equal(!!overlap(object,layout.teacher),false);}
+  }
+  await page.locator('[data-role="part-label"]').click();await settled();const focused=await snapshot();
+  await page.locator('[data-intro-page="0"]').click();await expect(overlay.locator('canvas')).toBeVisible();await page.waitForTimeout(500);
+  assert.deepEqual((await snapshot()).camera,focused.camera,'preview rotation cannot move the operation camera');
+  await overlay.locator('[data-intro-command="skip"]').click();await settled();
+  assert.deepEqual((await snapshot()).camera,focused.camera,'return restores focused operation camera');
+  await page.locator('[data-action="reset-view"]').click();await settled();const reset=await snapshot(true);
+  assert.ok(Math.abs(reset.objects[0].w-operation.objects[0].w)<2,'reset returns to the same overview');
+  await page.screenshot({path:`${dir}/task-${id}-reset.png`});
+  checks.push({task:id,introductionPages:count,rotationRadians:rotated.angle-initial.angle,initial,operation,reset});console.log('PASS 3D introduction',id,count,'pages');
+ }
+ assert.deepEqual(errors,[]);fs.writeFileSync(dir+'/result.json',JSON.stringify({pass:true,baseUrl,viewport,accountRole:'root',checks,errors},null,2));
+}catch(error){await page.screenshot({path:dir+'/failure.png'}).catch(()=>{});fs.writeFileSync(dir+'/result.json',JSON.stringify({pass:false,error:error.stack,snapshot:await snapshot(true).catch(()=>null),checks,errors},null,2));throw error;}finally{await browser.close();}
diff --git a/tools/bridge-label-placement-live.mjs b/tools/bridge-label-placement-live.mjs
new file mode 100644
index 0000000..6e33f83
--- /dev/null
+++ b/tools/bridge-label-placement-live.mjs
@@ -0,0 +1,96 @@
+import fs from 'node:fs';
+import assert from 'node:assert/strict';
+import { chromium, expect } from '@playwright/test';
+import { login } from './role-permissions-live.mjs';
+
+const baseUrl = process.env.BASE_URL || 'http://127.0.0.1:6180';
+const viewport = { width: Number(process.env.WIDTH || 1920), height: Number(process.env.HEIGHT || 945) };
+const dir = 'reports/bridge-label-placement-20260925' + (process.env.REPORT_SUFFIX || '');
+fs.mkdirSync(dir, { recursive: true });
+const session = await login('root'), checks = [], errors = [];
+const browser = await chromium.launch({ channel: 'msedge', headless: true, args: ['--enable-unsafe-swiftshader'] });
+const page = await browser.newPage({ viewport });
+await page.addInitScript(session => {
+  sessionStorage.setItem('unreal-tran:web:access-token:v1', session.accessToken);
+  sessionStorage.setItem('unreal-tran:web:refresh-token:v1', session.refreshToken);
+  localStorage.setItem('unreal-tran:web:preferences:v1', JSON.stringify({ themeMode: 'light' }));
+}, session);
+// Read-only observation of the actual loaded geometry and DOM; never changes training state.
+await page.route(/\/src\/features\/virtual-training-legacy\/upstream\/views\/training\.js(?:\?|$)/, async route => {
+  const response = await route.fetch();
+  await route.fulfill({ response, body: await response.text() + `
+globalThis.__labelPlacement = () => {
+ const e=activeTraining;if(!e?.sceneReady)return null;
+ const canvas=e.canvas.getBoundingClientRect(),active=e.getActiveTargetId();
+ const nodes=[{node:e.partLabel,id:active},...[...e.partLabelLayer.querySelectorAll('[data-label-target]')].map(node=>({node,id:node.dataset.labelTarget}))];
+ const labels=nodes.map(({node,id})=>{
+  const o=e.parts.get(id),box=new THREE.Box3();if(!o)return null;o.updateWorldMatrix(true,true);
+  o.traverse(m=>{if(!m.isMesh||m.userData.trainingPickProxy)return;m.geometry.computeBoundingBox();box.union(m.geometry.boundingBox.clone().applyMatrix4(m.matrixWorld));});
+  const p=e.worldToScreen(box.getCenter(new THREE.Vector3())),r=node.getBoundingClientRect();
+  return{id,text:node.textContent,visible:node.classList.contains('is-visible'),active:node===e.partLabel,anchor:{x:p.localX,y:p.localY},rect:{x:r.x-canvas.x,y:r.y-canvas.y,w:r.width,h:r.height}};
+ }).filter(Boolean);
+ return {labels,intro:e.introductionActive,pending:!!e.viewerCameraTween,completed:[...e.session.completed],camera:e.camera.position.toArray()};
+};` });
+});
+page.on('pageerror', error => errors.push(error.message));
+const snap = () => page.evaluate(() => globalThis.__labelPlacement?.());
+const settled = async () => {
+  await expect.poll(async () => (await snap())?.pending, { timeout: 20000 }).toBe(false);
+  await page.waitForTimeout(400);
+};
+const overlap = (a, b) => a.x < b.x + b.w - 1 && a.x + a.w > b.x + 1 && a.y < b.y + b.h - 1 && a.y + a.h > b.y + 1;
+const check = async (id, view) => {
+  await settled();
+  const state = await snap(), visible = state.labels.filter(l => l.visible);
+  assert.ok(visible.length > 0, `${id}/${view}: labels are visible`);
+  for (const [i, label] of visible.entries()) {
+    const distance = Math.hypot(label.rect.x + label.rect.w / 2 - label.anchor.x, label.rect.y + label.rect.h / 2 - label.anchor.y);
+    assert.ok(distance <= 130, `${id}/${view}/${label.id}: label moved ${distance.toFixed(1)}px from its part`);
+    assert.ok(visible.slice(i + 1).every(other => !overlap(label.rect, other.rect)), `${id}/${view}: labels overlap`);
+  }
+  assert.deepEqual(state.completed, [], 'focusing and viewer tools cannot complete steps');
+  if (view === 'overview') {
+    await page.waitForTimeout(400);
+    const stable = (await snap()).labels.filter(l => l.visible);
+    assert.deepEqual(stable.map(l => l.id), visible.map(l => l.id), 'stationary labels cannot flicker between layouts');
+    stable.forEach((label, i) => {
+      assert.ok(Math.abs(label.rect.x - visible[i].rect.x) < 1 && Math.abs(label.rect.y - visible[i].rect.y) < 1,
+        'hidden label measurement cannot shift neighbouring labels');
+    });
+  }
+  await page.screenshot({ path: `${dir}/task-${id}-${view}.png` });
+  checks.push({ task: id, view, ...state });
+};
+try {
+  for (const id of (process.env.TASK_IDS || '86,87,88,89').split(',')) {
+    await page.goto(`${baseUrl}/teaching/virtual-training/preview/${id}`);
+    await expect.poll(async () => Boolean(await snap()), { timeout: 120000 }).toBe(true);
+    await page.locator('[data-intro-command="skip"]').click();
+    if (!await page.locator('[data-action="toggle-part-labels"]').isVisible()) await page.locator('[data-viewer-action="tools"]').click();
+    await page.locator('[data-action="toggle-part-labels"]').click();
+    await check(id, 'overview');
+    const candidate = (await snap()).labels.find(l => l.visible && !l.active);
+    if (candidate) await page.locator(`[data-label-target="${candidate.id}"]`).click();
+    else await page.locator('[data-role="part-label"]').click();
+    await check(id, 'focus');
+    await page.locator('[data-action="toggle-hide-others"]').click();
+    await check(id, 'hide-others');
+    await page.locator('[data-action="toggle-hide-others"]').click();
+    await page.locator('[data-action="reset-view"]').click();
+    await check(id, 'reset');
+    const canvas = await page.locator('.training-canvas').boundingBox();
+    await page.mouse.move(canvas.x + canvas.width * .65, canvas.y + canvas.height * .48);
+    await page.mouse.down({ button: 'right' });
+    await page.mouse.move(canvas.x + canvas.width * .65 + 60, canvas.y + canvas.height * .48 + 12, { steps: 12 });
+    await page.mouse.up({ button: 'right' });
+    await check(id, 'moved');
+    console.log('PASS labels', id);
+  }
+  assert.deepEqual(errors, []);
+  fs.writeFileSync(dir + '/result.json', JSON.stringify({ pass: true, baseUrl, viewport, accountRole: 'root', serverMutations: [], checks, errors }, null, 2));
+  fs.writeFileSync(dir + '/index.html', `<!doctype html><meta charset="utf-8"><title>部件标签位置检查</title><style>body{font:16px system-ui;max-width:1400px;margin:28px auto;background:#f4f8f7;color:#17453d}img{width:100%;border:1px solid #b9ceca}section{margin:24px 0}a{color:#078871}</style><h1>部件标签位置检查：通过</h1><p>${baseUrl} · ${viewport.width} × ${viewport.height} · 教员预览（root）· 未创建任务或提交训练成绩。</p><p>标签中心距部件投影不超过128像素，互不重叠；检查聚焦、隐藏其他、复位和移动视角。</p><a href="result.json">检查数据</a>${checks.map(c => `<section><h2>任务 ${c.task} · ${c.view}</h2><img src="task-${c.task}-${c.view}.png"></section>`).join('')}`);
+} catch (error) {
+  await page.screenshot({ path: dir + '/failure.png' }).catch(() => {});
+  fs.writeFileSync(dir + '/result.json', JSON.stringify({ pass: false, error: error.stack, checks, errors, state: await snap().catch(() => null) }, null, 2));
+  throw error;
+} finally { await browser.close(); }