diff --git a/apps/presentation/dashboard/smoke/research-analysis-read-smoke.mjs b/apps/presentation/dashboard/smoke/research-analysis-read-smoke.mjs
index 5eb933f06f..cbdfab2824 100644
--- a/apps/presentation/dashboard/smoke/research-analysis-read-smoke.mjs
+++ b/apps/presentation/dashboard/smoke/research-analysis-read-smoke.mjs
@@ -20,7 +20,7 @@ const study = caseFixture.analyses[0].case_study;
 const studyNavigation = packId => ({url: new URL('http://127.0.0.1/chat/'), goalId: 'child', packId, namespace: null,
   follow: () => {throw Error('read navigated');}});
 const renderedStudy = renderToStaticMarkup(createElement(ResearchCaseStudy, {
-  study, zh: false, historical: true, scope: caseFixture.analyses[0].input.scope,
+  study, zh: false, historical: true, active: true, scope: caseFixture.analyses[0].input.scope,
   navigation: studyNavigation('saved-pack'),
   onCitation: () => {throw Error('read executed a citation');},
 }));
@@ -35,6 +35,7 @@ const casePack = {pack_id: "one", title: "First study", scope: caseFixture.analy
   case_study: study, case_study_summary: {title: study.title}, applicability: "current"};
 const secondCase = {...casePack, pack_id: "two", title: "Second study"};
 const renderCase = packs => renderToStaticMarkup(createElement(ResearchCaseReading, {
+  active: true,
   analysis: {zh: false, pack: casePack, snapshot: {catalog: {packs}}, location: {open: false}, studyNavigation},
 }));
 assert.ok(!renderCase([casePack]).includes("<select"), "A single saved version reads directly");
diff --git a/apps/presentation/dashboard/smoke/research-evidence-version-browser-smoke.mjs b/apps/presentation/dashboard/smoke/research-evidence-version-browser-smoke.mjs
index 0edb1736b4..475d93a576 100644
--- a/apps/presentation/dashboard/smoke/research-evidence-version-browser-smoke.mjs
+++ b/apps/presentation/dashboard/smoke/research-evidence-version-browser-smoke.mjs
@@ -97,7 +97,46 @@ try {
   await (await late).finished();
   await page.evaluate(() => new Promise(resolvePaint => requestAnimationFrame(() => requestAnimationFrame(resolvePaint))));
   assert.equal(await citation.count(), 0, "Late original response cannot reopen the previous evidence");
-  console.log("research evidence version: saved and late original excerpts isolated");
+
+  // Open a saved chapter through the same workspace router used by the tabs
+  // and parent links. Browser Back must keep the previous visit's position.
+  localizedReady = false;
+  const child = JSON.parse(await readFile(resolve(import.meta.dirname, "../src/data/fixtures/case-study-child.json"), "utf8"));
+  const parent = {goal_id: child.parent_goal_id, display_name: "Benchmark", events: [], analyses: []};
+  const study = await start("study", child, parent);
+  const studyPack = (await (await fetch(new URL(analysisPath + "?" + new URLSearchParams({goal_id: child.goal_id}), study))).json()).pack;
+  const chapter = studyPack.case_study.sections[1];
+  const address = new URL("/chat/", study);
+  address.search = new URLSearchParams({goalId: child.goal_id, view: "research", research_goal: child.goal_id,
+    research_reading: "case", research_analysis_goal: child.goal_id, research_pack: studyPack.pack_id});
+  address.hash = "case-section-" + studyPack.pack_id + "-" + chapter.id;
+  const atChapter = () => page.waitForFunction(id => document.activeElement?.id === id, address.hash.slice(1));
+  await page.goto(address.href);
+  await atChapter();
+  const tabs = page.locator(".personal-goal-tabs");
+  await tabs.getByRole("button", {name: "任务", exact: true}).click();
+  await page.waitForURL(url => url.searchParams.get("view") === "tasks");
+  assert.equal(new URL(page.url()).hash, address.hash);
+  await tabs.getByRole("button", {name: "研究", exact: true}).click();
+  await atChapter();
+  await page.locator("button.research-parent-goal").click();
+  await page.waitForURL(url => url.searchParams.get("goalId") === parent.goal_id);
+  function assertParentAddress() {
+    const url = new URL(page.url());
+    assert.equal(url.hash, "");
+    assert.equal([...url.searchParams.keys()].some(key => key.startsWith("research_")), false,
+      "The parent's address belongs to its own research");
+  }
+  assertParentAddress();
+  await page.goBack();
+  await atChapter();
+  assert.equal(new URL(page.url()).searchParams.get("research_pack"), studyPack.pack_id);
+  await page.reload();
+  await atChapter();
+  await page.goForward();
+  await page.waitForURL(url => url.searchParams.get("goalId") === parent.goal_id);
+  assertParentAddress();
+  console.log("research evidence version: saved excerpts isolated and chapter navigation restored");
 } finally {
   releaseOriginal?.();
   await browser?.close();
@@ -110,12 +149,15 @@ try {
   await rm(root, {recursive: true, force: true});
 }
 
-async function start(name, capture) {
-  const fixture = resolve(root, name + ".json");
-  await writeFile(fixture, JSON.stringify(capture));
+async function start(name, ...captures) {
+  const fixtures = await Promise.all(captures.map(async (capture, index) => {
+    const path = resolve(root, name + "-" + index + ".json");
+    await writeFile(path, JSON.stringify(capture));
+    return path;
+  }));
   const child = spawn(resolveTestPython({repoRoot: repo}), [
     "-u", "examples/personal-workspace-browser/research-history-backend.py",
-    "--fixture", fixture, "--workspace-directory", "--assets-dir", assets,
+    ...fixtures.flatMap(path => ["--fixture", path]), "--workspace-directory", "--assets-dir", assets,
   ], {cwd: repo, env: {...process.env, PYTHONPATH: repo}, stdio: ["ignore", "pipe", "pipe"]});
   servers.push(child);
   let error = "";
diff --git a/apps/presentation/dashboard/src/features/personal-workspace/goal-research-analysis.tsx b/apps/presentation/dashboard/src/features/personal-workspace/goal-research-analysis.tsx
index 9fcced13eb..1e55e0f8d5 100644
--- a/apps/presentation/dashboard/src/features/personal-workspace/goal-research-analysis.tsx
+++ b/apps/presentation/dashboard/src/features/personal-workspace/goal-research-analysis.tsx
@@ -396,7 +396,7 @@ export function ResearchReportSummary({analysis: a}: {analysis: Controller}) {
     onExpand={origin => {a.trigger.current = origin; a.show();}} onCitation={a.readCitation}/></div> : null;
 }
 
-export function ResearchCaseReading({analysis: a, onHistory}: {analysis: Controller; onHistory: () => void}) {
+export function ResearchCaseReading({analysis: a, active, onHistory}: {analysis: Controller; active: boolean; onHistory: () => void}) {
   const packs = (a.snapshot?.catalog.packs ?? []).filter(p => p.case_study_summary);
   const p = a.pack;
   const firstStudy = packs[0]?.pack_id;
@@ -410,7 +410,7 @@ export function ResearchCaseReading({analysis: a, onHistory}: {analysis: Control
         {packs.map(pack => <option key={pack.pack_id} value={pack.pack_id}>{pack.title}</option>)}
       </select></label> : null}<button type="button" onClick={onHistory}>{a.zh ? "研究记录与分析" : "Research records and analysis"} ↗</button></header>
     <AnalysisReadState analysis={a}/>
-    {p?.case_study ? <ResearchCaseStudy key={p.pack_id} study={p.case_study} zh={a.zh} historical={p.applicability !== "current"}
+    {p?.case_study ? <ResearchCaseStudy key={p.pack_id} study={p.case_study} zh={a.zh} historical={p.applicability !== "current"} active={active}
       scope={p.scope} navigation={a.studyNavigation(p.pack_id)} onCitation={a.readCitation}/> : !a.loading && !a.readError ? <p>{a.zh ? "选择一份解读，阅读问题背景、策略差异、关键转折与证据。" : "Choose a study to read its background, approaches, turning points and evidence."}</p> : null}
     <ResearchCitationPanel analysis={a}/>
   </section>;
diff --git a/apps/presentation/dashboard/src/features/personal-workspace/goal-research-history.tsx b/apps/presentation/dashboard/src/features/personal-workspace/goal-research-history.tsx
index 5c30414da6..5876a80b50 100644
--- a/apps/presentation/dashboard/src/features/personal-workspace/goal-research-history.tsx
+++ b/apps/presentation/dashboard/src/features/personal-workspace/goal-research-history.tsx
@@ -514,7 +514,7 @@ export function GoalResearchHistory({goalId, originalGoalId = goalId, preferHist
       onSelect={strategies.choose} onClose={() => strategies.choose(null)}/>;
   }
   if (caseReading && (hasCases || awaitingRequestedCase)) {
-    return <ResearchCaseReading analysis={analysis} onHistory={() => setCaseMode(false)}/>;
+    return <ResearchCaseReading analysis={analysis} active={active} onHistory={() => setCaseMode(false)}/>;
   }
   return <section className="research-history" aria-label={copy.title} aria-busy={busy}>
     {hasCases ? <button type="button" className="case-return-reader" onClick={() => setCaseMode(true)}>{zh ? "← Case 深度解读" : "← Case studies"}</button> : null}
diff --git a/apps/presentation/dashboard/src/features/personal-workspace/research-case-study.tsx b/apps/presentation/dashboard/src/features/personal-workspace/research-case-study.tsx
index 536e5d6982..047f2e7cea 100644
--- a/apps/presentation/dashboard/src/features/personal-workspace/research-case-study.tsx
+++ b/apps/presentation/dashboard/src/features/personal-workspace/research-case-study.tsx
@@ -52,8 +52,8 @@ function focusChapter(chapter: HTMLElement) {
 }
 
 /** A document's author controls the composition; the host owns navigation and evidence. */
-export function ResearchCaseStudy({study, zh, historical, scope, navigation, onCitation}: {
-  study: TrajectoryCaseStudy; zh: boolean; historical: boolean;
+export function ResearchCaseStudy({study, zh, historical, active, scope, navigation, onCitation}: {
+  study: TrajectoryCaseStudy; zh: boolean; historical: boolean; active: boolean;
   scope: {case_id: string; run_id: string; revision: string; window: string};
   navigation: {url: URL; goalId: string; packId: string; namespace: string | null; follow: (href: URL) => void};
   onCitation: (c: AssessmentCitation, origin?: HTMLButtonElement) => void;
@@ -62,6 +62,7 @@ export function ResearchCaseStudy({study, zh, historical, scope, navigation, onC
   const {url, goalId, packId, namespace, follow} = navigation;
   const prefix = `${caseChapterHashPrefix.slice(1)}${namespace ? namespace + '-' : ''}${packId}-`;
   useEffect(() => {
+    if (!active) return;
     // The URL can arrive before the saved study is mounted, or while history
     // switches to another Goal/version. Only restore a visible matching chapter.
     let frame = 0;
@@ -84,7 +85,7 @@ export function ResearchCaseStudy({study, zh, historical, scope, navigation, onC
       window.removeEventListener('popstate', restore);
       window.removeEventListener('hashchange', restore);
     };
-  }, [goalId, packId, prefix]);
+  }, [active, goalId, packId, prefix]);
   const citationLinks = (citations: AssessmentCitation[]) => <ul className="case-citation-links" role="list">
     {citations.map((c, i) => <li key={i}><button type="button" onClick={e => onCitation(c, e.currentTarget)}>
       {c.source_id} · {zh ? '行' : 'lines'} {c.first_line}–{c.last_line} <span aria-hidden="true">↗</span>
diff --git a/apps/presentation/dashboard/src/router.tsx b/apps/presentation/dashboard/src/router.tsx
index 8611c19fac..34ed80ac6c 100644
--- a/apps/presentation/dashboard/src/router.tsx
+++ b/apps/presentation/dashboard/src/router.tsx
@@ -22,26 +22,39 @@ function RouteLoading() {
   return <main className="p-8" role="status">加载中… / Loading…</main>;
 }
 
-const searchSchema = z.object({
-  goalId: z.string().optional().default(""),
-  // Absence alone opens all Goals. Preserve present decoded values, including
-  // empty strings/arrays, so malformed scope cannot become an unscoped visit.
-  // Numeric opaque IDs still survive the router's JSON decoding.
-  rootGoalId: z.unknown().transform(value => typeof value === "string" && value
-    ? value : JSON.stringify(value)).optional(),
-  // Preserve the existing history/analysis owners' query state. They validate
-  // it from the URL themselves; router decoding can produce arrays or numbers.
+// The research readers validate their bookmarks against the selected Goal and
+// source. Keep their existing URL fields together for workspace navigation.
+const researchSearchShape = {
   research_lens: z.unknown().optional(),
   research_phase: z.unknown().optional(),
   research_goal: z.unknown().optional(),
+  research_reading: z.unknown().optional(),
   research_node: z.unknown().optional(),
   research_finding: z.unknown().optional(),
   research_event: z.unknown().optional(),
   research_state: z.unknown().optional(),
   research_group: z.unknown().optional(),
+  research_parent_node: z.unknown().optional(),
+  research_parent_group: z.unknown().optional(),
+  research_question: z.unknown().optional(),
+  research_return: z.unknown().optional(),
   research_pack: z.unknown().optional(),
+  research_compare: z.unknown().optional(),
   research_analysis: z.unknown().optional(),
   research_analysis_goal: z.unknown().optional(),
+};
+export const clearedResearchSearch = Object.fromEntries(
+  Object.keys(researchSearchShape).map(key => [key, undefined]),
+) as Record<keyof typeof researchSearchShape, undefined>;
+
+const searchSchema = z.object({
+  goalId: z.string().optional().default(""),
+  // Absence alone opens all Goals. Preserve present decoded values, including
+  // empty strings/arrays, so malformed scope cannot become an unscoped visit.
+  // Numeric opaque IDs still survive the router's JSON decoding.
+  rootGoalId: z.unknown().transform(value => typeof value === "string" && value
+    ? value : JSON.stringify(value)).optional(),
+  ...researchSearchShape,
   // Settings view state is validated by its local reader, just like research
   // focus. Preserve it across workspace navigation without granting a target.
   settings_scope: z.unknown().optional(),
diff --git a/apps/presentation/dashboard/src/views/dashboard-page.tsx b/apps/presentation/dashboard/src/views/dashboard-page.tsx
index a07d8a6757..482bad0e80 100644
--- a/apps/presentation/dashboard/src/views/dashboard-page.tsx
+++ b/apps/presentation/dashboard/src/views/dashboard-page.tsx
@@ -9,6 +9,7 @@ import { useBoundConversation } from "../data/use-bound-conversation";
 import {AppStewardEntry, useAppStewardTarget} from "../features/personal-workspace/app-steward-entry";
 import { goalSubtree } from "../features/personal-workspace/goal-hierarchy";
 import {readGoalWorkBrowse, writeGoalWorkBrowse, type GoalWorkBrowseState} from "../features/personal-workspace/goal-work-browse";
+import { caseChapterHashPrefix } from "../features/personal-workspace/research-case-study";
 import {compactWorkspaceText as compactShareText, workspaceAgentTodoFromItem} from "../features/personal-workspace/personal-workspace-model";
 import type { GoalAcceptanceObservation } from "../data/goal-acceptance-observation";
 import { attentionDetails, attentionDetailsFromSnapshot, sourceAttention } from "../features/personal-workspace/attention-details";
@@ -19,7 +20,7 @@ import { CircleAlert, Moon, RefreshCw, Sun } from "lucide-react";
 import type { DigestAttentionSummary } from "../../../../../loopx/control_plane/presentation/goal_workspace_digest.js";
 import { hasGoalFailureStatus } from "../../../../../loopx/control_plane/presentation/goal_failure_status.js";
 
-import { dashboardRoute } from "../router";
+import { clearedResearchSearch, dashboardRoute } from "../router";
 import {
   QueueItem,
   RunGoal,
@@ -3507,6 +3508,10 @@ function StatusRequestView({
 }
 
 
+function keepCaseChapterHash(hash = "") {
+  return hash.startsWith(caseChapterHashPrefix.slice(1)) ? hash : "";
+}
+
 export function DashboardPage() {
   const search = dashboardRoute.useSearch();
   const navigate = dashboardRoute.useNavigate();
@@ -3628,16 +3633,15 @@ export function DashboardPage() {
     // Loading the current source on reload must not add a duplicate history
     // entry: Back should return to the user's previous workspace view.
     if (search.statusUrl !== url) {
+      const keepsSource = (currentUrl: string) => !currentUrl || currentUrl === url
+        || Boolean(prepared && bound && statusSourceForUrl(prepared, currentUrl, window.location.href)?.statusUrl === bound.statusUrl);
       await navigate({
         replace: bindingInitialIdentity,
+        hash: keepsSource(search.statusUrl) ? keepCaseChapterHash : undefined,
         search: (current) => {
           // Normalizing an alias of the same physical reader preserves its
           // bookmarks; a different source still clears source-local selection.
-          const sameStatusSource = "statusUrl" in current && (!current.statusUrl || current.statusUrl === url
-            || Boolean(prepared && bound && statusSourceForUrl(prepared, current.statusUrl, window.location.href)?.statusUrl === bound.statusUrl));
-          const runtimeSourceChanged = Boolean(nextPayload.local_dashboard_api?.read_only_sources?.length
-            && "statusUrl" in current && current.statusUrl && current.statusUrl !== url
-            && (!prepared || !bound || statusSourceForUrl(prepared, current.statusUrl, window.location.href)?.statusUrl !== bound.statusUrl));
+          const sameStatusSource = "statusUrl" in current && keepsSource(current.statusUrl);
           return {
             ...current,
             statusUrl: url,
@@ -3647,9 +3651,7 @@ export function DashboardPage() {
             workSession: sameStatusSource ? current.workSession : undefined,
             // Node/pack ids are source-local even when the Goal ids coincide.
             // Back restores the original source's URL and its own selection.
-            ...(runtimeSourceChanged ? {research_lens: undefined, research_phase: undefined, research_goal: undefined, research_node: undefined, research_finding: undefined, research_event: undefined, research_state: undefined,
-              research_group: undefined, research_analysis: undefined,
-              research_analysis_goal: undefined, research_pack: undefined} : {}),
+            ...(sameStatusSource ? {} : clearedResearchSearch),
           };
         },
       });
@@ -3903,6 +3905,7 @@ export function DashboardPage() {
         replace: true,
         search: (current) => ({
           ...current,
+          ...clearedResearchSearch,
           goalId: "",
         }),
       });
@@ -3919,8 +3922,10 @@ export function DashboardPage() {
 
   function selectGoal(goalId: string, view?: WorkspaceGoalTab) {
     void navigate({
+      hash: search.goalId === goalId ? keepCaseChapterHash : undefined,
       search: (current) => ({
         ...current,
+        ...("goalId" in current && current.goalId === goalId ? {} : clearedResearchSearch),
         goalId,
         workspace: undefined,
         conversationBinding: undefined,
@@ -3934,7 +3939,7 @@ export function DashboardPage() {
   }
 
   function selectWorkspace(projectRef: string | null) {
-    void navigate({ search: (current) => ({ ...current, goalId: "", todo: undefined, workAgent: undefined, workSession: undefined, workspace: projectRef ?? undefined,
+    void navigate({ search: (current) => ({ ...current, ...clearedResearchSearch, goalId: "", todo: undefined, workAgent: undefined, workSession: undefined, workspace: projectRef ?? undefined,
       conversationBinding: undefined, conversationSession: undefined, messageSession: undefined, message: undefined, view: "conversation" }) });
   }
 
@@ -3955,44 +3960,53 @@ export function DashboardPage() {
     <PersonalGoalHome
       appEntry={appEntry}
       conversationMessageFocus={search.messageSession && search.message ? {sessionId: search.messageSession, messageId: search.message} : undefined}
-      onClearMessageFocus={() => void navigate({replace: true, search: current => ({...current, messageSession: undefined, message: undefined})})}
+      onClearMessageFocus={() => void navigate({replace: true, hash: keepCaseChapterHash,
+        search: current => ({...current, messageSession: undefined, message: undefined})})}
       workBrowseSearch={search}
       onWorkBrowseChange={(patch, workSource, replace = false) => {
         const goalId = search.goalId, statusUrl = search.statusUrl;
-        void navigate({replace, search: current => "goalId" in current && current.goalId === goalId && current.statusUrl === statusUrl
+        void navigate({replace, hash: keepCaseChapterHash, search: current => "goalId" in current && current.goalId === goalId && current.statusUrl === statusUrl
           ? {...current, ...writeGoalWorkBrowse({...readGoalWorkBrowse(current, goalId, workSource), ...patch}, goalId, workSource)} : current});
       }}
       boundConversation={search.conversationBinding !== undefined || search.conversationSession !== undefined
         ? { bindingId: search.conversationBinding ?? "", sessionId: search.conversationSession ?? "" } : null}
-      onOpenOriginalConversation={target => void navigate({search: current => ({...current, goalId: "", workspace: undefined,
+      onOpenOriginalConversation={target => void navigate({search: current => ({...current, ...clearedResearchSearch, goalId: "", workspace: undefined,
         workAgent: undefined, workSession: undefined, todo: undefined, messageSession: undefined, message: undefined, conversationBinding: target.bindingId, conversationSession: target.sessionId, view: "conversation"})})}
       rootGoalId={search.rootGoalId}
-      onChangeGoalRoot={rootGoalId => void navigate({search: current => ({...current,
-        workAgent: undefined, workSession: undefined, messageSession: undefined, message: undefined, rootGoalId: rootGoalId ?? undefined, goalId: rootGoalId ?? ("goalId" in current ? current.goalId : ""), workspace: undefined})})}
+      onChangeGoalRoot={rootGoalId => void navigate({
+        hash: !rootGoalId || rootGoalId === search.goalId ? keepCaseChapterHash : undefined,
+        search: current => ({...current,
+          ...(!rootGoalId || ("goalId" in current && current.goalId === rootGoalId) ? {} : clearedResearchSearch),
+          workAgent: undefined, workSession: undefined, messageSession: undefined, message: undefined,
+          rootGoalId: rootGoalId ?? undefined, goalId: rootGoalId ?? ("goalId" in current ? current.goalId : ""), workspace: undefined}),
+      })}
       goalArchiveLoadState={goalArchiveLoadState}
       sourceError={loadError}
       selectedTodoId={search.todo ?? null}
       selectedWorkSessionId={search.workSession}
       onSelectWorkSession={(sessionId, replace = false) => {
         const goalId = search.goalId, agentId = search.workAgent, statusUrl = search.statusUrl;
-        void navigate({replace, search: current => "goalId" in current && current.goalId === goalId && current.workAgent === agentId && current.statusUrl === statusUrl
+        void navigate({replace, hash: keepCaseChapterHash, search: current => "goalId" in current && current.goalId === goalId && current.workAgent === agentId && current.statusUrl === statusUrl
           ? {...current, workSession: sessionId, messageSession: current.workSession === sessionId ? current.messageSession : undefined,
             message: current.workSession === sessionId ? current.message : undefined} : current});
       }}
       selectedWorkAgentId={search.workAgent ?? null}
       onSelectWorkAgent={(agentId, sessionId) => {
         const goalId = search.goalId, statusUrl = search.statusUrl;
-        void navigate({search: current => "goalId" in current && current.goalId === goalId && current.statusUrl === statusUrl
+        void navigate({hash: keepCaseChapterHash, search: current => "goalId" in current && current.goalId === goalId && current.statusUrl === statusUrl
           ? {...current, todo: undefined, workAgent: agentId ?? undefined, workSession: sessionId, messageSession: undefined, message: undefined, view: agentId === null ? "overview" : "conversation"} : current});
       }}
       onSelectTodo={(todoId) => {
         const goalId = search.goalId, statusUrl = search.statusUrl;
-        void navigate({search: current => "goalId" in current && current.goalId === goalId && current.statusUrl === statusUrl
+        void navigate({hash: keepCaseChapterHash, search: current => "goalId" in current && current.goalId === goalId && current.statusUrl === statusUrl
           ? {...current, todo: todoId ?? undefined} : current});
       }}
       selectedView={search.view === "conversation" ? "chat" : search.goalId ? search.view ?? "overview" : "overview"}
       onSelectView={(view) => {
-        void navigate({ search: current => ({ ...current, workAgent: undefined, workSession: undefined, messageSession: undefined, message: undefined, view: view === "chat" ? "conversation" : view }) });
+        void navigate({
+          hash: keepCaseChapterHash,
+          search: current => ({ ...current, workAgent: undefined, workSession: undefined, messageSession: undefined, message: undefined, view: view === "chat" ? "conversation" : view }),
+        });
       }}
       onGoalActivationStateChange={(goalId, activationState) => {
         statusRequestFenceRef.current.projectionRevision += 1;