diff --git a/electron/main.js b/electron/main.js
index ea28615..d2dcd59 100644
--- a/electron/main.js
+++ b/electron/main.js
@@ -370,6 +370,15 @@ function registerIpcHandlers() {
     openPetdexWindow();
   });
 
+  ipcMain.on('pet:state-changed', (event) => {
+    if (settingsWindow === undefined
+      || settingsWindow.isDestroyed()
+      || event.sender.id !== settingsWindow.webContents.id) return;
+    const currentPetWindow = getCurrentPetWindow();
+    if (currentPetWindow === undefined) return;
+    currentPetWindow.webContents.send('pet:state-changed');
+  });
+
   ipcMain.handle('pet:manual-dock', () => {
     if (!EDGE_DOCKING_ENABLED) return;
     const currentPetWindow = getCurrentPetWindow();
diff --git a/electron/main.test.js b/electron/main.test.js
index 2aa49f9..68ba0e5 100644
--- a/electron/main.test.js
+++ b/electron/main.test.js
@@ -227,3 +227,26 @@ describe('Electron process lifecycle', () => {
     expect(settingsWindows).toHaveLength(2);
   });
 });
+
+describe('renderer state synchronization', () => {
+  it('forwards state changes from settings to the current pet window only', async () => {
+    const openSettings = electron.ipcMain.handle.mock.calls
+      .find(([channel]) => channel === 'pet:open-settings')[1];
+    await openSettings();
+    const settings = electron.windows
+      .filter(({ options }) => options.title === 'Codex Pet Pause 设置')
+      .at(-1);
+    const currentPet = electron.windows
+      .filter(({ options, destroyed }) => options.transparent === true && !destroyed)
+      .at(-1);
+    const forwardState = electron.ipcMain.on.mock.calls
+      .find(([channel]) => channel === 'pet:state-changed')[1];
+
+    forwardState({ sender: settings.webContents });
+    expect(currentPet.webContents.send).toHaveBeenCalledWith('pet:state-changed');
+
+    currentPet.webContents.send.mockClear();
+    forwardState({ sender: currentPet.webContents });
+    expect(currentPet.webContents.send).not.toHaveBeenCalled();
+  });
+});
diff --git a/electron/preload.js b/electron/preload.js
index 6575769..41096c3 100644
--- a/electron/preload.js
+++ b/electron/preload.js
@@ -8,6 +8,12 @@ contextBridge.exposeInMainWorld('petShell', {
     ipcRenderer.on('pet:petdex-import', listener);
     return () => ipcRenderer.removeListener('pet:petdex-import', listener);
   },
+  notifyStateChanged: () => ipcRenderer.send('pet:state-changed'),
+  onStateChanged: (callback) => {
+    const listener = () => callback();
+    ipcRenderer.on('pet:state-changed', listener);
+    return () => ipcRenderer.removeListener('pet:state-changed', listener);
+  },
   dockNow: () => ipcRenderer.invoke('pet:manual-dock'),
   dragWindowTo: (x, y) => ipcRenderer.send('pet:drag-window', { x, y }),
   showContextMenu: (x, y) => ipcRenderer.send('pet:show-context-menu', { x, y }),
diff --git a/package-lock.json b/package-lock.json
index 7487a2f..d17b5c0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "codex-pet-pause",
-  "version": "0.2.5",
+  "version": "0.2.6",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "codex-pet-pause",
-      "version": "0.2.5",
+      "version": "0.2.6",
       "license": "MIT",
       "dependencies": {
         "@zip.js/zip.js": "^2.8.34",
diff --git a/package.json b/package.json
index dd1385f..765a22d 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "codex-pet-pause",
   "private": true,
-  "version": "0.2.5",
+  "version": "0.2.6",
   "description": "A playful, local-first break reminder PWA with interactive and Codex-compatible pets.",
   "license": "MIT",
   "repository": {
diff --git a/src/infrastructure/rendererSynchronization.test.ts b/src/infrastructure/rendererSynchronization.test.ts
new file mode 100644
index 0000000..2e9a220
--- /dev/null
+++ b/src/infrastructure/rendererSynchronization.test.ts
@@ -0,0 +1,32 @@
+import { afterEach, describe, expect, test, vi } from 'vitest';
+import { createRendererSynchronization } from './rendererSynchronization';
+
+describe('renderer synchronization', () => {
+  afterEach(() => {
+    delete window.petShell;
+  });
+
+  test('uses native Electron IPC when browser channels are unreliable', () => {
+    const notifyStateChanged = vi.fn();
+    const unsubscribe = vi.fn();
+    let receiveNative: (() => void) | undefined;
+    window.petShell = {
+      notifyStateChanged,
+      onStateChanged(callback) {
+        receiveNative = callback;
+        return unsubscribe;
+      },
+    };
+    const synchronization = createRendererSynchronization();
+    const listener = vi.fn();
+    synchronization.subscribe(listener);
+
+    synchronization.notify();
+    expect(notifyStateChanged).toHaveBeenCalledOnce();
+    receiveNative?.();
+    expect(listener).toHaveBeenCalledOnce();
+
+    synchronization.close();
+    expect(unsubscribe).toHaveBeenCalledOnce();
+  });
+});
diff --git a/src/infrastructure/rendererSynchronization.ts b/src/infrastructure/rendererSynchronization.ts
index b50bebc..7d49052 100644
--- a/src/infrastructure/rendererSynchronization.ts
+++ b/src/infrastructure/rendererSynchronization.ts
@@ -31,6 +31,7 @@ export function createRendererSynchronization(): RendererSynchronization {
   let closed = false;
   let lastToken: string | undefined;
   let channel: BroadcastChannel | undefined;
+  let unsubscribeNative = (): void => undefined;
 
   try {
     if (typeof globalThis.BroadcastChannel === 'function') {
@@ -57,6 +58,12 @@ export function createRendererSynchronization(): RendererSynchronization {
       if (isSyncMessage(event.data)) receive(event.data.token);
     };
   }
+  try {
+    unsubscribeNative = window.petShell?.onStateChanged?.(() => receive())
+      ?? (() => undefined);
+  } catch {
+    unsubscribeNative = () => undefined;
+  }
 
   return {
     notify(): void {
@@ -73,6 +80,11 @@ export function createRendererSynchronization(): RendererSynchronization {
       } catch {
         // Storage events remain available when BroadcastChannel delivery fails.
       }
+      try {
+        window.petShell?.notifyStateChanged?.();
+      } catch {
+        // Browser synchronization remains available when native IPC delivery fails.
+      }
     },
 
     subscribe(listener): () => void {
@@ -86,6 +98,7 @@ export function createRendererSynchronization(): RendererSynchronization {
       closed = true;
       listeners.clear();
       window.removeEventListener('storage', onStorage);
+      unsubscribeNative();
       if (channel !== undefined) {
         channel.onmessage = null;
         channel.close();
diff --git a/src/types/electron-api.d.ts b/src/types/electron-api.d.ts
index 47f9f7f..5733d6b 100644
--- a/src/types/electron-api.d.ts
+++ b/src/types/electron-api.d.ts
@@ -7,6 +7,8 @@ declare global {
         | { type: 'archive'; name: string; bytes: ArrayBuffer }
         | { type: 'error' }
       ) => void) => () => void;
+      notifyStateChanged?: () => void;
+      onStateChanged?: (callback: () => void) => () => void;
       dockNow?: () => void;
       dragWindowTo?: (x: number, y: number) => void;
       showContextMenu?: (x?: number, y?: number) => void;