diff --git a/src/app/RefineContext.test.tsx b/src/app/RefineContext.test.tsx
index a755f5a..d02be92 100644
--- a/src/app/RefineContext.test.tsx
+++ b/src/app/RefineContext.test.tsx
@@ -3,12 +3,17 @@ import type { ReactNode } from "react";
 
 import { useAccessStore } from "@/store/accessStore";
 import { useAuthStore } from "@/store/authStore";
+import {
+  clearIntentionalLogout,
+  markIntentionalLogout,
+} from "@/lib/logoutIntent";
 import { App } from "./RefineContext";
 
 let mockSessionState: {
   data: {
     accessToken: string;
     user: { id: string; name: string };
+    error?: "RefreshAccessTokenError" | "SessionExpired";
   } | null;
   status: "authenticated" | "unauthenticated";
 } = {
@@ -70,6 +75,7 @@ describe("RefineContext access authentication", () => {
   const originalRequest = global.Request;
 
   beforeEach(() => {
+    clearIntentionalLogout();
     mockPathname = "/network-simulation";
     mockProjectProviderBlocks = false;
     mockSessionState = {
@@ -210,4 +216,63 @@ describe("RefineContext access authentication", () => {
       });
     });
   });
+
+  it("does not treat returning to a protected route after logout as session expiry", async () => {
+    markIntentionalLogout();
+    mockSessionState = { data: null, status: "unauthenticated" };
+    useAuthStore.setState({
+      accessToken: null,
+      sessionExpired: true,
+      sessionExpiryReason: "refresh_failed",
+    });
+
+    render(
+      <App>
+        <div>应用内容</div>
+      </App>,
+    );
+
+    await waitFor(() => {
+      expect(useAuthStore.getState()).toMatchObject({
+        sessionExpired: false,
+        sessionExpiryReason: null,
+      });
+    });
+  });
+
+  it("does not hide a real refresh failure after an intentional logout", async () => {
+    markIntentionalLogout();
+    mockSessionState = {
+      data: {
+        accessToken: "expired-access-token",
+        user: { id: "user-1", name: "Test User" },
+        error: "RefreshAccessTokenError",
+      },
+      status: "authenticated",
+    };
+
+    const { rerender } = render(
+      <App>
+        <div>应用内容</div>
+      </App>,
+    );
+
+    await waitFor(() => {
+      expect(useAuthStore.getState()).toMatchObject({
+        sessionExpired: true,
+        sessionExpiryReason: "refresh_failed",
+      });
+    });
+
+    mockSessionState = { data: null, status: "unauthenticated" };
+    rerender(
+      <App>
+        <div>应用内容</div>
+      </App>,
+    );
+
+    await waitFor(() => {
+      expect(useAuthStore.getState().sessionExpired).toBe(true);
+    });
+  });
 });
diff --git a/src/app/RefineContext.tsx b/src/app/RefineContext.tsx
index 8ebe24c..e835ed9 100644
--- a/src/app/RefineContext.tsx
+++ b/src/app/RefineContext.tsx
@@ -24,6 +24,10 @@ import { useAccessStore } from "@/store/accessStore";
 import { useProjectStore } from "@/store/projectStore";
 import { apiFetch } from "@/lib/apiFetch";
 import { completeLogout, reportLogoutAudit } from "@/lib/logoutFlow";
+import {
+  clearIntentionalLogout,
+  isIntentionalLogout,
+} from "@/lib/logoutIntent";
 import { clearSessionRecoveryDrafts } from "@/lib/sessionRecoveryDraft";
 import { permissionCodes, resourcePermissions } from "@/lib/permissions";
 import { config } from "@config/config";
@@ -88,15 +92,17 @@ export const App = (props: React.PropsWithChildren<AppProps>) => {
 
   useEffect(() => {
     if (data?.error === "SessionExpired") {
+      clearIntentionalLogout();
       markSessionExpired("session_max_age");
       return;
     }
     if (data?.error === "RefreshAccessTokenError") {
+      clearIntentionalLogout();
       markSessionExpired("refresh_failed");
       return;
     }
     if (status === "unauthenticated") {
-      if (to === "/login") {
+      if (to === "/login" || isIntentionalLogout()) {
         clearSessionExpired();
         return;
       }
@@ -104,6 +110,7 @@ export const App = (props: React.PropsWithChildren<AppProps>) => {
       return;
     }
     if (status === "authenticated") {
+      clearIntentionalLogout();
       clearSessionExpired();
     }
   }, [clearSessionExpired, data?.error, markSessionExpired, status, to]);
diff --git a/src/lib/logoutFlow.test.ts b/src/lib/logoutFlow.test.ts
index 3cbaccb..748093d 100644
--- a/src/lib/logoutFlow.test.ts
+++ b/src/lib/logoutFlow.test.ts
@@ -1,4 +1,8 @@
 import { completeLogout, reportLogoutAudit } from "./logoutFlow";
+import {
+  clearIntentionalLogout,
+  isIntentionalLogout,
+} from "./logoutIntent";
 
 describe("reportLogoutAudit", () => {
   it("starts an authenticated keepalive request", async () => {
@@ -28,6 +32,10 @@ describe("reportLogoutAudit", () => {
 });
 
 describe("completeLogout", () => {
+  beforeEach(() => {
+    clearIntentionalLogout();
+  });
+
   it("navigates immediately without waiting for audit reporting", async () => {
     const reportAudit = jest.fn(
       () => new Promise<unknown>(() => undefined),
@@ -44,6 +52,7 @@ describe("completeLogout", () => {
     await Promise.resolve();
 
     expect(reportAudit).toHaveBeenCalledTimes(1);
+    expect(isIntentionalLogout()).toBe(true);
     expect(clearLocalState).toHaveBeenCalledTimes(1);
     expect(navigate).toHaveBeenCalledWith("/api/auth/keycloak-logout");
     await expect(result).resolves.toEqual({ success: true });
@@ -79,4 +88,20 @@ describe("completeLogout", () => {
     expect(clearLocalState).toHaveBeenCalledTimes(1);
     expect(navigate).toHaveBeenCalledWith("/api/auth/keycloak-logout");
   });
+
+  it("still navigates when local cleanup throws", async () => {
+    const navigate = jest.fn();
+
+    await expect(
+      completeLogout({
+        reportAudit: jest.fn().mockResolvedValue(undefined),
+        clearLocalState: () => {
+          throw new DOMException("Storage unavailable", "SecurityError");
+        },
+        navigate,
+      }),
+    ).resolves.toEqual({ success: true });
+
+    expect(navigate).toHaveBeenCalledWith("/api/auth/keycloak-logout");
+  });
 });
diff --git a/src/lib/logoutFlow.ts b/src/lib/logoutFlow.ts
index b3c33f6..1df123b 100644
--- a/src/lib/logoutFlow.ts
+++ b/src/lib/logoutFlow.ts
@@ -1,3 +1,5 @@
+import { markIntentionalLogout } from "@/lib/logoutIntent";
+
 const KEYCLOAK_LOGOUT_PATH = "/api/auth/keycloak-logout";
 
 type CompleteLogoutOptions = {
@@ -41,7 +43,12 @@ export const completeLogout = async ({
     // Synchronous reporting errors must not block logout either.
   }
 
-  clearLocalState();
+  markIntentionalLogout();
+  try {
+    clearLocalState();
+  } catch {
+    // Browser storage cleanup failures must not prevent the IdP logout.
+  }
   navigate(KEYCLOAK_LOGOUT_PATH);
   return { success: true as const };
 };
diff --git a/src/lib/logoutIntent.test.ts b/src/lib/logoutIntent.test.ts
new file mode 100644
index 0000000..a33e3c8
--- /dev/null
+++ b/src/lib/logoutIntent.test.ts
@@ -0,0 +1,57 @@
+import {
+  clearIntentionalLogout,
+  isIntentionalLogout,
+  markIntentionalLogout,
+} from "./logoutIntent";
+
+describe("intentional logout marker", () => {
+  afterEach(() => {
+    jest.restoreAllMocks();
+    clearIntentionalLogout();
+  });
+
+  it("stores a timestamp only for the current tab", () => {
+    jest.spyOn(Date, "now").mockReturnValue(1_700_000_000_000);
+
+    markIntentionalLogout();
+
+    expect(sessionStorage.getItem("tjwater:intentional-logout")).toBe(
+      "1700000000000",
+    );
+    expect(localStorage.getItem("tjwater:intentional-logout")).toBeNull();
+    expect(isIntentionalLogout()).toBe(true);
+  });
+
+  it("accepts an intentional logout event from another open tab", () => {
+    window.dispatchEvent(
+      new StorageEvent("storage", {
+        key: "tjwater:intentional-logout-event",
+        newValue: JSON.stringify({
+          type: "mark",
+          markedAt: Date.now(),
+        }),
+      }),
+    );
+
+    expect(isIntentionalLogout()).toBe(true);
+  });
+
+  it("does not broadcast a clear event when the current tab has no marker", () => {
+    clearIntentionalLogout();
+    const setItem = jest.spyOn(Storage.prototype, "setItem");
+
+    expect(isIntentionalLogout()).toBe(false);
+    expect(setItem).not.toHaveBeenCalled();
+  });
+
+  it("expires a stale marker", () => {
+    const now = 1_700_000_000_000;
+    const nowSpy = jest.spyOn(Date, "now").mockReturnValue(now);
+    markIntentionalLogout();
+
+    nowSpy.mockReturnValue(now + 30 * 60 * 1000 + 1);
+
+    expect(isIntentionalLogout()).toBe(false);
+    expect(sessionStorage.getItem("tjwater:intentional-logout")).toBeNull();
+  });
+});
diff --git a/src/lib/logoutIntent.ts b/src/lib/logoutIntent.ts
new file mode 100644
index 0000000..adf6b2f
--- /dev/null
+++ b/src/lib/logoutIntent.ts
@@ -0,0 +1,81 @@
+const INTENTIONAL_LOGOUT_STORAGE_KEY = "tjwater:intentional-logout";
+const INTENTIONAL_LOGOUT_EVENT_KEY = "tjwater:intentional-logout-event";
+const INTENTIONAL_LOGOUT_TTL_MS = 30 * 60 * 1000;
+let memoryMarkedAt: number | null = null;
+
+const withStorage = (
+  storageName: "localStorage" | "sessionStorage",
+  callback: (storage: Storage) => void,
+) => {
+  if (typeof window === "undefined") return;
+  try {
+    callback(window[storageName]);
+  } catch {
+    // Logout must still proceed when browser storage is unavailable.
+  }
+};
+
+const setLocalMarker = (markedAt: number | null) => {
+  memoryMarkedAt = markedAt;
+  withStorage("sessionStorage", (storage) => {
+    if (markedAt === null) {
+      storage.removeItem(INTENTIONAL_LOGOUT_STORAGE_KEY);
+    } else {
+      storage.setItem(INTENTIONAL_LOGOUT_STORAGE_KEY, String(markedAt));
+    }
+  });
+};
+
+const broadcastIntent = (
+  payload: { type: "mark"; markedAt: number } | { type: "clear" },
+) => {
+  withStorage("localStorage", (storage) => {
+    storage.setItem(INTENTIONAL_LOGOUT_EVENT_KEY, JSON.stringify(payload));
+    storage.removeItem(INTENTIONAL_LOGOUT_EVENT_KEY);
+  });
+};
+
+if (typeof window !== "undefined") {
+  window.addEventListener("storage", (event) => {
+    if (event.key !== INTENTIONAL_LOGOUT_EVENT_KEY || !event.newValue) return;
+    try {
+      const payload = JSON.parse(event.newValue) as {
+        type?: unknown;
+        markedAt?: unknown;
+      };
+      if (payload.type === "mark" && typeof payload.markedAt === "number") {
+        setLocalMarker(payload.markedAt);
+      } else if (payload.type === "clear") {
+        setLocalMarker(null);
+      }
+    } catch {
+      // Ignore malformed cross-tab events.
+    }
+  });
+}
+
+export const markIntentionalLogout = () => {
+  const markedAt = Date.now();
+  setLocalMarker(markedAt);
+  broadcastIntent({ type: "mark", markedAt });
+};
+
+export const clearIntentionalLogout = () => {
+  setLocalMarker(null);
+  broadcastIntent({ type: "clear" });
+};
+
+export const isIntentionalLogout = () => {
+  let markedAt = memoryMarkedAt;
+  withStorage("sessionStorage", (storage) => {
+    const stored = Number(storage.getItem(INTENTIONAL_LOGOUT_STORAGE_KEY));
+    if (Number.isFinite(stored) && stored > 0) markedAt = stored;
+  });
+  if (markedAt === null) return false;
+  const age = Date.now() - markedAt;
+  if (age < 0 || age > INTENTIONAL_LOGOUT_TTL_MS) {
+    setLocalMarker(null);
+    return false;
+  }
+  return true;
+};
diff --git a/src/store/authStore.test.ts b/src/store/authStore.test.ts
new file mode 100644
index 0000000..b00f06a
--- /dev/null
+++ b/src/store/authStore.test.ts
@@ -0,0 +1,45 @@
+import {
+  clearIntentionalLogout,
+  markIntentionalLogout,
+} from "@/lib/logoutIntent";
+
+import { useAuthStore } from "./authStore";
+
+describe("authStore intentional logout boundary", () => {
+  beforeEach(() => {
+    clearIntentionalLogout();
+    useAuthStore.setState({
+      accessToken: "access-token",
+      sessionExpired: false,
+      sessionExpiryReason: null,
+    });
+  });
+
+  afterEach(() => {
+    clearIntentionalLogout();
+  });
+
+  it("ignores late expiry signals after an intentional logout", () => {
+    markIntentionalLogout();
+
+    useAuthStore.getState().markSessionExpired("unauthorized");
+
+    expect(useAuthStore.getState()).toMatchObject({
+      accessToken: null,
+      sessionExpired: false,
+      sessionExpiryReason: null,
+    });
+  });
+
+  it("keeps real refresh failures visible after an intentional logout", () => {
+    markIntentionalLogout();
+
+    useAuthStore.getState().markSessionExpired("refresh_failed");
+
+    expect(useAuthStore.getState()).toMatchObject({
+      accessToken: null,
+      sessionExpired: true,
+      sessionExpiryReason: "refresh_failed",
+    });
+  });
+});
diff --git a/src/store/authStore.ts b/src/store/authStore.ts
index 64e2561..371cc50 100644
--- a/src/store/authStore.ts
+++ b/src/store/authStore.ts
@@ -1,5 +1,7 @@
 import { create } from "zustand";
 
+import { isIntentionalLogout } from "@/lib/logoutIntent";
+
 interface AuthState {
   accessToken: string | null;
   sessionExpired: boolean;
@@ -16,11 +18,21 @@ export const useAuthStore = create<AuthState>((set) => ({
   sessionExpired: false,
   sessionExpiryReason: null,
   setAccessToken: (token) => set({ accessToken: token }),
-  markSessionExpired: (reason) => set({
-    accessToken: null,
-    sessionExpired: true,
-    sessionExpiryReason: reason,
-  }),
+  markSessionExpired: (reason) => {
+    if (reason === "unauthorized" && isIntentionalLogout()) {
+      set({
+        accessToken: null,
+        sessionExpired: false,
+        sessionExpiryReason: null,
+      });
+      return;
+    }
+    set({
+      accessToken: null,
+      sessionExpired: true,
+      sessionExpiryReason: reason,
+    });
+  },
   clearSessionExpired: () => set({
     sessionExpired: false,
     sessionExpiryReason: null,