diff --git a/app/config/architecture-inventory.json b/app/config/architecture-inventory.json
index 5254157..1c83018 100644
--- a/app/config/architecture-inventory.json
+++ b/app/config/architecture-inventory.json
@@ -372,7 +372,7 @@
   "css_layers": [
     "/shared/tokens.css?v=20260818-2",
     "/shared/base.css?v=20260806-1",
-    "/shared/shell.css?v=20260818-2",
+    "/shared/shell.css?v=20260818-3",
     "/shared/auth.css?v=20260806-1",
     "/shared/components/controls.css?v=20260806-1",
     "/shared/components/navigation.css?v=20260806-1",
@@ -390,7 +390,7 @@
     "/pages/popularity/foundation.css?v=20260806-1",
     "/pages/dragon-tiger/foundation.css?v=20260806-1",
     "/pages/screener/foundation.css?v=20260806-2",
-    "/pages/mentor/foundation.css?v=20260818-2",
+    "/pages/mentor/foundation.css?v=20260818-3",
     "/pages/heaven/foundation.css?v=20260806-2",
     "/pages/review/foundation.css?v=20260806-1"
   ],
@@ -451,8 +451,8 @@
     },
     {
       "path": "frontend/shared/shell.css",
-      "bytes": 54781,
-      "lines": 3348
+      "bytes": 52879,
+      "lines": 3274
     },
     {
       "path": "backend/features/heaven/engine.py",
@@ -606,8 +606,8 @@
     },
     {
       "path": "frontend/pages/mentor/page.html",
-      "bytes": 8117,
-      "lines": 110
+      "bytes": 8357,
+      "lines": 116
     },
     {
       "path": "backend/data/providers/tushare_daily.py",
diff --git a/app/frontend/index.html b/app/frontend/index.html
index c289179..0d87ab4 100644
--- a/app/frontend/index.html
+++ b/app/frontend/index.html
@@ -19,7 +19,7 @@
   </script>
   <link rel="stylesheet" href="/shared/tokens.css?v=20260818-2">
   <link rel="stylesheet" href="/shared/base.css?v=20260806-1">
-  <link rel="stylesheet" href="/shared/shell.css?v=20260818-2">
+  <link rel="stylesheet" href="/shared/shell.css?v=20260818-3">
   <link rel="stylesheet" href="/shared/auth.css?v=20260806-1">
   <link rel="stylesheet" href="/shared/components/controls.css?v=20260806-1">
   <link rel="stylesheet" href="/shared/components/navigation.css?v=20260806-1">
@@ -37,7 +37,7 @@
   <link rel="stylesheet" href="/pages/popularity/foundation.css?v=20260806-1">
   <link rel="stylesheet" href="/pages/dragon-tiger/foundation.css?v=20260806-1">
   <link rel="stylesheet" href="/pages/screener/foundation.css?v=20260806-2">
-  <link rel="stylesheet" href="/pages/mentor/foundation.css?v=20260818-2">
+  <link rel="stylesheet" href="/pages/mentor/foundation.css?v=20260818-3">
   <link rel="stylesheet" href="/pages/heaven/foundation.css?v=20260806-2">
   <link rel="stylesheet" href="/pages/review/foundation.css?v=20260806-1">
 </head>
diff --git a/app/frontend/pages.config.js b/app/frontend/pages.config.js
index 9eeb2f8..40a1200 100644
--- a/app/frontend/pages.config.js
+++ b/app/frontend/pages.config.js
@@ -47,7 +47,7 @@
     ["heaven", "/pages/heaven/page.html?v=20260803-1", ["heavenView"]],
     ["ladder", "/pages/ladder/page.html?v=20260803-1", ["ladderView"]],
     ["screener", "/pages/screener/page.html?v=20260804-1", ["screenerView", "screenerTrackingView"]],
-    ["mentor", "/pages/mentor/page.html?v=20260818-2", ["mentorView"]],
+    ["mentor", "/pages/mentor/page.html?v=20260818-3", ["mentorView"]],
     ["rotation", "/pages/rotation/page.html?v=20260803-1", ["rotationView"]],
     ["auction", "/pages/auction/page.html?v=20260803-1", ["auctionView"]],
     ["themes", "/pages/themes/page.html?v=20260803-1", ["themeLibraryView"]],
@@ -81,7 +81,7 @@
     "/pages/popularity/page.js?v=20260729-1",
     "/pages/dragon-tiger/page.js?v=20260806-1",
     "/pages/screener/page.js?v=20260806-1",
-    "/pages/mentor/page.js?v=20260818-2",
+    "/pages/mentor/page.js?v=20260818-3",
     "/pages/heaven/page.js?v=20260729-1",
     "/pages/review/page.js?v=20260729-1",
     "/shared/state.js?v=20260729-1",
diff --git a/app/frontend/pages/mentor/foundation.css b/app/frontend/pages/mentor/foundation.css
index f038e37..e626bb7 100644
--- a/app/frontend/pages/mentor/foundation.css
+++ b/app/frontend/pages/mentor/foundation.css
@@ -87,6 +87,45 @@
   margin-bottom: var(--space-8);
 }
 
+#mentorView .mentor-page-header {
+  flex: 0 0 56px;
+  height: 56px;
+  min-height: 56px;
+  display: flex;
+  align-items: center;
+  padding: 0 20px;
+  border-bottom: 1px solid var(--qp-border);
+  background: var(--qp-bg-header);
+}
+
+#mentorView .mentor-page-title {
+  min-width: 0;
+  display: flex;
+  align-items: baseline;
+  gap: 12px;
+}
+
+#mentorView .mentor-page-title h2 {
+  flex: 0 0 auto;
+  margin: 0;
+  color: var(--qp-text-1);
+  font-size: 18px;
+  font-weight: var(--font-weight-semibold);
+  line-height: 1.3;
+  letter-spacing: 0;
+}
+
+#mentorView .mentor-page-title p {
+  min-width: 0;
+  margin: 0;
+  overflow: hidden;
+  color: var(--qp-text-3);
+  font-size: 13px;
+  line-height: 1.4;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 #mentorView .mentor-layout {
   min-width: 0;
   min-height: 0;
@@ -1322,6 +1361,10 @@
     border-bottom: 1px solid var(--qp-border);
   }
 
+  #mentorView .mentor-page-header {
+    display: none;
+  }
+
   #mentorView .mentor-chat-panel {
     overflow: visible;
   }
diff --git a/app/frontend/pages/mentor/page.html b/app/frontend/pages/mentor/page.html
index d0e8d49..436bbf9 100644
--- a/app/frontend/pages/mentor/page.html
+++ b/app/frontend/pages/mentor/page.html
@@ -1,6 +1,12 @@
-    <section id="mentorView" class="workspace-view page member-feature-view redesigned-mentor-view mentor-page-header">
+    <section id="mentorView" class="workspace-view page member-feature-view redesigned-mentor-view">
       <div class="member-gate" hidden><div class="member-gate-icon"><i data-lucide="lock-keyhole"></i></div><div><strong>问师仅对会员开放</strong><span>开通会员后可使用思维模型进行对话。会员状态可从顶部账号标识进入。</span></div></div>
       <div id="mentorNotice" class="inline-notice" hidden></div>
+      <header class="mentor-page-header" aria-label="问师">
+        <div class="mentor-page-title">
+          <h2>问师</h2>
+          <p id="mentorPageSubtitle">与不同交易思维模型持续对话 · 数据日期 --</p>
+        </div>
+      </header>
       <div class="mentor-layout">
         <aside class="mentor-sidebar" aria-label="思维模型目录">
           <div class="mentor-directory-tools">
diff --git a/app/frontend/pages/mentor/page.js b/app/frontend/pages/mentor/page.js
index 7396692..da3e2fb 100644
--- a/app/frontend/pages/mentor/page.js
+++ b/app/frontend/pages/mentor/page.js
@@ -66,7 +66,7 @@ function renderMentorWorkspace() {
   const setup = state.mentorSetup;
   if (!setup) return;
   const selected = setup.mentors.find((item) => item.id === state.selectedMentorId) || null;
-  setText("currentPageSubtitle", `与不同交易思维模型持续对话 · 数据日期 ${displayCompactDate(setup.trade_date)}`);
+  setText("mentorPageSubtitle", `与不同交易思维模型持续对话 · 数据日期 ${displayCompactDate(setup.trade_date)}`);
   setText("activeMentorName", selected?.name || "--");
   setText("activeMentorAvatar", mentorAvatarText(selected));
   applyMentorAvatarTone(document.querySelector("#activeMentorAvatar"), mentorAvatarToneClass(selected));
diff --git a/app/frontend/shared/shell.css b/app/frontend/shared/shell.css
index 0d9ced6..3b671a6 100644
--- a/app/frontend/shared/shell.css
+++ b/app/frontend/shared/shell.css
@@ -1756,7 +1756,11 @@ body.sidebar-collapsed .module-nav .module-tab {
 
   padding: 0px 16px;
 
-  overflow: hidden;
+  overflow-x: auto;
+
+  overflow-y: hidden;
+
+  scrollbar-width: none;
 
   border-top: 0px;
 
@@ -1775,6 +1779,10 @@ body.sidebar-collapsed .module-nav .module-tab {
   box-shadow: none;
 }
 
+.overview-strip::-webkit-scrollbar {
+  display: none;
+}
+
 .overview-strip .row {
   display: flex;
 
@@ -1784,6 +1792,8 @@ body.sidebar-collapsed .module-nav .module-tab {
 
   padding: 7px var(--page-pad-x);
 
+  flex-shrink: 0;
+
   font-size: 12px;
 
   color: var(--sub);
@@ -2266,7 +2276,13 @@ body.sidebar-collapsed .status-bar {
 .main {
   margin-left: var(--sidebar-width);
 
-  min-width: 1080px;
+  min-width: 0;
+}
+
+@media (min-width: 1280px) {
+  .main {
+    min-width: 1080px;
+  }
 }
 
 .app-header {
@@ -3223,8 +3239,8 @@ body.sidebar-collapsed .status-bar {
   }
 }
 
-/* Dedicated mentor workspace (final day/night spec). Only the active mentor
-   view enables this immersive state; other pages keep the canonical shell. */
+/* Generic page title slot in the shell header. Kept hidden so each page owns
+   its own in-view title header (mentor renders one inside #mentorView). */
 .app-page-context {
   min-width: 0;
   flex: 1 1 auto;
@@ -3256,93 +3272,3 @@ body.sidebar-collapsed .status-bar {
   text-overflow: ellipsis;
   white-space: nowrap;
 }
-
-@media (min-width: 1024px) {
-  body[data-active-view="mentorView"] .main {
-    width: 100%;
-    min-width: 0;
-    margin-left: 0;
-    height: 100dvh;
-    display: flex;
-    flex-direction: column;
-    overflow: hidden;
-  }
-
-  body[data-active-view="mentorView"] .module-nav {
-    display: none;
-  }
-
-  body[data-active-view="mentorView"] .status-bar {
-    display: none;
-  }
-
-  body[data-active-view="mentorView"] .market-tape,
-  body[data-active-view="mentorView"] .mobile-page-context {
-    display: none;
-  }
-
-  body[data-active-view="mentorView"] .overview-strip {
-    display: none;
-  }
-
-  body[data-active-view="mentorView"] .app-header {
-    flex: 0 0 56px;
-    height: 56px;
-    min-height: 56px;
-    gap: 24px;
-    padding: 0 20px;
-    background: #F5F6F7;
-  }
-
-  :root[data-theme="dark"] body[data-active-view="mentorView"] .app-header {
-    background: #141519;
-  }
-
-  body[data-active-view="mentorView"] .app-page-context {
-    display: flex;
-  }
-
-  body[data-active-view="mentorView"] .header-actions > :is(.global-search-button, .alert-button, .assistant-button, .header-menu-button, .header-date-group, .header-command-group) {
-    display: none;
-  }
-
-  body[data-active-view="mentorView"] .theme-toggle {
-    width: auto;
-    height: 32px;
-    min-height: 32px;
-    display: inline-flex;
-    align-items: center;
-    gap: 6px;
-    padding: 0 12px;
-    border-radius: var(--radius-md);
-    background: transparent;
-    color: var(--text-secondary);
-    font-size: var(--font-size-label);
-    font-weight: var(--font-weight-medium);
-  }
-
-  body[data-active-view="mentorView"] .theme-toggle .lucide {
-    width: 16px;
-    height: 16px;
-  }
-
-  body[data-active-view="mentorView"] #themeModeText {
-    display: inline-block;
-  }
-
-  body[data-active-view="mentorView"] .app-main {
-    flex: 1 1 auto;
-    height: calc(100dvh - 56px);
-    min-height: 0;
-    display: flex;
-    flex-direction: column;
-    padding: 0;
-    overflow: hidden;
-  }
-
-  body[data-active-view="mentorView"] .workspace-view.active-view {
-    flex: 1 1 auto;
-    min-height: 0;
-    overflow: hidden;
-  }
-}
diff --git a/app/tests/e2e/app-shell.spec.js b/app/tests/e2e/app-shell.spec.js
index 6de708a..bee3550 100644
--- a/app/tests/e2e/app-shell.spec.js
+++ b/app/tests/e2e/app-shell.spec.js
@@ -2838,22 +2838,55 @@ test("mentor directory exposes evidence filters and private owner metadata", asy
   const searchField = await page.locator("#mentorView .mentor-search-field").boundingBox();
   expect(searchField.width).toBeGreaterThan(160);
   await expect(page.locator("#mentorSearchInput")).toHaveAttribute("placeholder", "搜索联系人或标签");
-  await expect(page.locator("#tradeDate")).toBeHidden();
-  await expect(page.locator("#syncButton")).toBeHidden();
-  await expect(page.locator("#settingsButton")).toBeHidden();
-  await expect(page.locator("#headerMenuButton")).toBeHidden();
-  await expect(page.locator("#accountButton")).toBeHidden();
+  await expect(page.locator(".module-nav")).toBeVisible();
+  await expect(page.locator(".module-tab.active")).toHaveAttribute("data-view", "mentorView");
+  await expect(page.locator(".market-tape")).toBeVisible();
+  await expect(page.locator("#tradeDate")).toBeVisible();
+  await expect(page.locator(".overview-strip")).toBeVisible();
+  await expect(page.locator(".status-bar")).toBeVisible();
   await expect(page.locator("#themeToggle")).toBeVisible();
+  await expect(page.locator("#mentorView .mentor-page-title h2")).toHaveText("问师");
+  await expect(page.locator("#mentorPageSubtitle")).toContainText("数据日期");
   expect(await page.evaluate(() => document.documentElement.scrollHeight - window.innerHeight)).toBeLessThanOrEqual(1);
   await page.setViewportSize({ width: 1920, height: 947 });
   const expandedMentorLayout = await page.locator("#mentorView .mentor-layout").boundingBox();
   const footerBar = await page.locator("#mentorView .mentor-workspace-footer").boundingBox();
-  expect(Math.abs(footerBar.y + footerBar.height - 947)).toBeLessThanOrEqual(1);
+  const shellStatusBar = await page.locator(".status-bar").boundingBox();
+  expect(Math.abs(shellStatusBar.y + shellStatusBar.height - 947)).toBeLessThanOrEqual(1);
+  expect(footerBar.y + footerBar.height).toBeLessThanOrEqual(shellStatusBar.y);
   expect(Math.abs(expandedMentorLayout.y + expandedMentorLayout.height - footerBar.y)).toBeLessThanOrEqual(1);
   expect(await page.evaluate(() => document.documentElement.scrollWidth - window.innerWidth)).toBeLessThanOrEqual(1);
   expect(await page.evaluate(() => document.documentElement.scrollHeight - window.innerHeight)).toBeLessThanOrEqual(1);
 });
 
+test("mentor stays inside the project shell and switching pages leaves no residue", async ({ page }) => {
+  await page.setViewportSize({ width: 1440, height: 900 });
+  await mockApplication(page, session("admin", true));
+  await page.goto("/index.html");
+  await page.locator('[data-view="mentorView"]').first().click();
+
+  await expect(page.locator("#mentorView")).toHaveClass(/active-view/);
+  await expect(page.locator(".module-nav")).toBeVisible();
+  await expect(page.locator(".module-tab.active")).toHaveAttribute("data-view", "mentorView");
+  await expect(page.locator("#mentorList .mentor-option")).toHaveCount(22);
+  await expect(page.locator("#mentorView .mentor-page-title h2")).toHaveText("问师");
+
+  await page.locator('[data-view="limitPool"]').first().click();
+  await expect(page.locator("#limitPool")).toHaveClass(/active-view/);
+  await expect(page.locator("#mentorView")).not.toHaveClass(/active-view/);
+  await expect(page.locator("#mentorView")).not.toBeVisible();
+  await expect(page.locator(".module-nav")).toBeVisible();
+  await expect(page.locator(".module-tab.active")).toHaveAttribute("data-view", "limitPool");
+
+  await page.locator('[data-view="mentorView"]').first().click();
+  await expect(page.locator("#mentorView")).toHaveClass(/active-view/);
+  await expect(page.locator(".module-nav")).toBeVisible();
+  await expect(page.locator(".module-tab.active")).toHaveAttribute("data-view", "mentorView");
+  await expect(page.locator("#mentorList .mentor-option")).toHaveCount(22);
+  await expect(page.locator("#mentorPageSubtitle")).toContainText("数据日期");
+  expect(await page.evaluate(() => document.documentElement.scrollWidth - window.innerWidth)).toBeLessThanOrEqual(1);
+});
+
 test("mentor keeps two columns and opens the profile floating dialog on desktop", async ({ page }) => {
   await page.setViewportSize({ width: 1440, height: 900 });
   await mockApplication(page, session("admin", true));
diff --git a/app/tests/test_frontend_contract.py b/app/tests/test_frontend_contract.py
index 25e05a2..06d4e15 100644
--- a/app/tests/test_frontend_contract.py
+++ b/app/tests/test_frontend_contract.py
@@ -339,10 +339,11 @@ class FrontendContractTests(unittest.TestCase):
         shell_styles = (STATIC_DIR / "shared" / "shell.css").read_text(encoding="utf-8")
         mentor_html = (STATIC_DIR / "pages" / "mentor" / "page.html").read_text(encoding="utf-8")
 
-        self.assertIn(
-            'body[data-active-view="mentorView"] .header-actions > :is(.global-search-button, .alert-button, .assistant-button, .header-menu-button, .header-date-group, .header-command-group)',
-            shell_styles,
-        )
+        self.assertNotIn('body[data-active-view="mentorView"]', shell_styles)
+        self.assertNotIn("body[data-active-view=mentorView]", shell_styles)
+        self.assertIn('id="mentorPageSubtitle"', mentor_html)
+        self.assertIn('class="mentor-page-header"', mentor_html)
+        self.assertIn("#mentorView .mentor-page-header", self.mentor_styles)
         for tone in ("violet", "blue", "green", "orange", "red", "teal", "purple", "yellow"):
             self.assertIn(f".mentor-avatar-tone-{tone} {{", self.mentor_styles, tone)
             self.assertIn(