diff --git a/src/app/chat/chat-screen.tsx b/src/app/chat/chat-screen.tsx
index 3695b75d..94a6d8e9 100644
--- a/src/app/chat/chat-screen.tsx
+++ b/src/app/chat/chat-screen.tsx
@@ -3,7 +3,7 @@
 import { useEffect, useRef, useState } from "react";
 import Image from "next/image";
 
-import { useAuthState } from "@/stores/auth/auth-context";
+import { useAuthDispatch, useAuthState } from "@/stores/auth/auth-context";
 import { useChatDispatch, useChatState } from "@/stores/chat/chat-context";
 import { useUserState } from "@/stores/user/user-context";
 import { ROUTES } from "@/router/routes";
@@ -42,6 +42,7 @@ export function ChatScreen() {
   const state = useChatState();
   const chatDispatch = useChatDispatch();
   const authState = useAuthState();
+  const authDispatch = useAuthDispatch();
   const userState = useUserState();
   const navigator = useAppNavigator();
   const [showExternalBrowserDialog, setShowExternalBrowserDialog] =
@@ -70,6 +71,25 @@ export function ChatScreen() {
   const shouldShowPwaInstall = state.historyLoaded && state.messages.length >= 10;
 
   const externalBrowserPromptShownRef = useRef(false);
+  const guestLoginRequestedRef = useRef(false);
+
+  useEffect(() => {
+    if (!authState.hasInitialized || authState.isLoading) return;
+
+    if (authState.loginStatus !== "notLoggedIn") {
+      guestLoginRequestedRef.current = false;
+      return;
+    }
+
+    if (guestLoginRequestedRef.current) return;
+    guestLoginRequestedRef.current = true;
+    authDispatch({ type: "AuthGuestLoginSubmitted" });
+  }, [
+    authDispatch,
+    authState.hasInitialized,
+    authState.isLoading,
+    authState.loginStatus,
+  ]);
 
   useEffect(() => {
     if (
diff --git a/src/app/splash/components/splash-button.tsx b/src/app/splash/components/splash-button.tsx
index 6af03253..e5ae41d1 100644
--- a/src/app/splash/components/splash-button.tsx
+++ b/src/app/splash/components/splash-button.tsx
@@ -12,7 +12,7 @@ export interface SplashButtonProps {
 
 export function SplashButton({ onStartChat }: SplashButtonProps) {
   const state = useAuthState();
-  const isLoading = state.isLoading;
+  const isLoading = !state.hasInitialized || state.isLoading;
 
   return (
     <div className={styles.wrapper}>
diff --git a/src/router/__tests__/navigation-resolver.test.ts b/src/router/__tests__/navigation-resolver.test.ts
index 70d61e3e..5c6ee8b4 100644
--- a/src/router/__tests__/navigation-resolver.test.ts
+++ b/src/router/__tests__/navigation-resolver.test.ts
@@ -33,12 +33,21 @@ describe("navigation resolver", () => {
     ).toBe("/subscription?type=topup");
   });
 
-  it("redirects not logged in session routes to splash", () => {
+  it("allows not logged in users to enter chat for guest bootstrap", () => {
     expect(
       resolveRouteGuardRedirect({
         loginStatus: "notLoggedIn",
         pathname: ROUTES.chat,
       }),
+    ).toBeNull();
+  });
+
+  it("redirects not logged in session routes except chat to splash", () => {
+    expect(
+      resolveRouteGuardRedirect({
+        loginStatus: "notLoggedIn",
+        pathname: ROUTES.sidebar,
+      }),
     ).toBe(ROUTES.splash);
   });
 
diff --git a/src/router/route-meta.ts b/src/router/route-meta.ts
index e7b592fb..127a0425 100644
--- a/src/router/route-meta.ts
+++ b/src/router/route-meta.ts
@@ -1,12 +1,17 @@
 import { ROUTES } from "./routes";
 
-export type RouteAccess = "public" | "session" | "realUser" | "authOnly";
+export type RouteAccess =
+  | "public"
+  | "guestEntry"
+  | "session"
+  | "realUser"
+  | "authOnly";
 
 const STATIC_ROUTE_ACCESS: Partial<Record<string, RouteAccess>> = {
   [ROUTES.root]: "public",
   [ROUTES.splash]: "authOnly",
   [ROUTES.auth]: "authOnly",
-  [ROUTES.chat]: "session",
+  [ROUTES.chat]: "guestEntry",
   [ROUTES.sidebar]: "session",
   [ROUTES.subscription]: "realUser",
   [ROUTES.coinsRules]: "public",
diff --git a/src/stores/auth/__tests__/auth-machine.test.ts b/src/stores/auth/__tests__/auth-machine.test.ts
index a142cef3..8fe5d6c6 100644
--- a/src/stores/auth/__tests__/auth-machine.test.ts
+++ b/src/stores/auth/__tests__/auth-machine.test.ts
@@ -95,13 +95,31 @@ describe("authMachine", () => {
     actor.stop();
   });
 
-  it("automatically guest logs in when initialization finds no login state", async () => {
+  it("initializes as notLoggedIn without automatically guest logging in", async () => {
     const guestLoginSpy = vi.fn<() => void>();
     const actor = createActor(createTestAuthMachine({ guestLoginSpy })).start();
 
     actor.send({ type: "AuthInit" });
     await waitFor(actor, (snapshot) => snapshot.matches("idle"));
 
+    const context = actor.getSnapshot().context;
+    expect(context.loginStatus).toBe("notLoggedIn");
+    expect(context.hasInitialized).toBe(true);
+    expect(guestLoginSpy).not.toHaveBeenCalled();
+
+    actor.stop();
+  });
+
+  it("guest logs in only after explicit guest login submission", async () => {
+    const guestLoginSpy = vi.fn<() => void>();
+    const actor = createActor(createTestAuthMachine({ guestLoginSpy })).start();
+
+    actor.send({ type: "AuthInit" });
+    await waitFor(actor, (snapshot) => snapshot.matches("idle"));
+
+    actor.send({ type: "AuthGuestLoginSubmitted" });
+    await waitFor(actor, (snapshot) => snapshot.matches("idle"));
+
     const context = actor.getSnapshot().context;
     expect(context.loginStatus).toBe("guest");
     expect(context.hasInitialized).toBe(true);
diff --git a/src/stores/auth/auth-context.tsx b/src/stores/auth/auth-context.tsx
index ac70c41f..db41d2ef 100644
--- a/src/stores/auth/auth-context.tsx
+++ b/src/stores/auth/auth-context.tsx
@@ -58,7 +58,7 @@ export function AuthProvider({ children }: AuthProviderProps) {
       username: state.context.username,
       confirmPassword: state.context.confirmPassword,
       // isLoading 覆盖邮箱登录 / 邮箱注册 / OAuth 跳转（NextAuth 重定向期间）/
-      // OAuth 回调后端 sync / 自动游客登录
+      // OAuth 回调后端 sync / 显式游客登录
       isLoading:
         state.matches("loadingEmailLogin") ||
         state.matches("loadingEmailRegister") ||
diff --git a/src/stores/auth/auth-events.ts b/src/stores/auth/auth-events.ts
index d77a1b7a..63dc4973 100644
--- a/src/stores/auth/auth-events.ts
+++ b/src/stores/auth/auth-events.ts
@@ -15,6 +15,7 @@ export type AuthEvent =
   /** App 启动时一次性派发 —— 读 storage 把 loginStatus 同步到状态机 */
   | { type: "AuthInit" }
   // 业务事件（提交）
+  | { type: "AuthGuestLoginSubmitted" }
   | { type: "AuthEmailLoginSubmitted"; email: string; password: string }
   | {
       type: "AuthEmailRegisterSubmitted";
diff --git a/src/stores/auth/auth-machine.ts b/src/stores/auth/auth-machine.ts
index 9461fbc7..aed10667 100644
--- a/src/stores/auth/auth-machine.ts
+++ b/src/stores/auth/auth-machine.ts
@@ -32,7 +32,7 @@ const toAuthErrorMessage = (error: unknown): string =>
 //
 // 设计：所有登录/同步流跑完都回 `idle`（带正确 `loginStatus`）。
 //
-// 未找到任何登录态时，初始化流程会自动进入 guest login，补齐游客会话。
+// 初始化只恢复已有登录态；游客登录必须由用户明确操作触发。
 // ============================================================
 export const authMachine = setup({
   types: {
@@ -49,6 +49,13 @@ export const authMachine = setup({
     checkAuthStatus: checkAuthStatusActor,
     logout: logoutActor,
   },
+  guards: {
+    canSubmitGuestLogin: ({ context }) =>
+      context.loginStatus === "notLoggedIn",
+    canLogoutToGuest: ({ context }) =>
+      context.loginStatus !== "notLoggedIn" &&
+      context.loginStatus !== "guest",
+  },
 }).createMachine({
   /** @xstate-layout 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-XCmx+P8aW3cTgMki1UwQBpHFRB1IQMdRMXHXFr0eCgJjAKZKDAGgICVKBXl86Z7w+SM1wM2MLGwQFopimKAnhLQWOwTFNF2JxAWuDwtBUkkpGQAhcAALz84gIBkMA8BoAA3JgXwqotctwfKir8hAlRq+9kEpZIhIpFtNwRAVkt8JkdCaXxWhMeFNHUNZTEMTwXExaEXF0HKFma4qaCgYgwGGYYRmwdCuoAMxGUZsAajaCq2qA2uqphOu6wReoIwzlGubAFoFUw3BMEpQXhSEXDWMiVDSlkJtdQt7gIJhkF87apRld9SvKyqarqy7YfhxGoGR6t33ujqusWHrQuE8LWytIFwT0fxAW0F14SUXQQe+x0HDZRy7TYuGEb8gm5Uwmhdv2w7jvQM6xmxiJ+bxoWifax7SZkcm8L6wicitXRuQYq1-C2cwXBomovrBX7jDaVonNFeW-LLf1UbKugMdq+qcYF7bHYDEXiZV56BFekTqdaPXxs5PJdGj+EyNqJ0z08Cx6b53GHd9J2RbFg7hiOghTvO2WcHt72M99oN-aesmXopzX3oQK0jyolxrkS05JuzS1bWcW1Am8Jw0SdW3Pbxn3K1was9rR13laxu209L8tx8n4ZK9Vmh1f0g1WwsXWLacEcjAPxuD1tfIB-B8FPBUcFsphuWF6gMewCrGts4l-OpcL+evafsvl5rGvQOwcqYDQsLUMwjcBQGxbmBSyjcvqXAmgxTkAQDCp1-gAeSeNPCqs8PYPywU8IB1cg61zehFUEyUDCmD8M6TQ-IErg2PEPCwB9QQmAwXjbBFB3650ltLC6P9uHEOVlXNWNcNYUJ3gyL6-1NCGAMDTPw0097RVWrvCEAQ2KwF4veQWs4oBEAAEIPjqj5XBbs573F0XxAxXFTH3nMRAEhEiyFSJDmArYUU2Y-VMCCTQugDx0OSheEEnIHKeDvhOHAtj9FI0MSYsx3kIB8LzgXGWoo4n2KMWARxzjXEb0kVvfqRF3BHmaBYVEo4TYWQaMUahJRTAGEaIUHRei-J3kfM+Wq+SUmWPwUXbA2TtpdI0r05JPlCmbx-KAspexnANHIiYTkqIBQHiWdgJZ-jszgnWO0uxoz1I9JfH0ixe0c7pK-pkmxHSjndNfGclxYj14zLCtvMBbJgQtzZA5PQ0cmgHiiVsnkrhYHFE5CEToNAWBwDkN0EpWtEAAFp2aGHRRizF6L1C+HhMi4eLkwCIvrpsowlxsxgjRAEUwqjDDOFRBoxKI1ygIXvj0Rqm0-LEtjAEnudo-DjQ8CNVRQJo43zWQKR0pguGC2lITEW3LWy8sqQKvwQqrAWU5vS1QrNEo6BvgS4uj8fbvkVQNZVvdVXXHaBqqo5E5oAl8GDXkvyZWL39AAvaZqiIWv5SCNVNrT4MWcHQ8iQ5mluqgDwrA3qci+q2P661wq6lh30E68pmh3CbGxGy4Zdz8aJLyZMiAsbEDxqteqg8OhajGE5OYWEA8jDQxiXmw5UAxknKeaW3InI+UJsFYGlNgRkqJVtOUJRE1WUhCAA */
   id: "auth",
@@ -78,10 +85,17 @@ export const authMachine = setup({
             errorMessage: null,
           }),
         },
-        AuthLogoutSubmitted: "loggingOut",
+        AuthLogoutSubmitted: {
+          guard: "canLogoutToGuest",
+          target: "loggingOut",
+        },
         // 启动一次性 init：从 storage 同步 loginStatus 到状态机 —— 由 <AuthStatusChecker /> 派发
         AuthInit: "initializing",
 
+        AuthGuestLoginSubmitted: {
+          guard: "canSubmitGuestLogin",
+          target: "loadingGuestLogin",
+        },
         AuthEmailLoginSubmitted: "loadingEmailLogin",
         AuthEmailRegisterSubmitted: "loadingEmailRegister",
         AuthGoogleLoginSubmitted: "loadingOAuth",
@@ -102,26 +116,14 @@ export const authMachine = setup({
       entry: assign({ errorMessage: null }),
       invoke: {
         src: "checkAuthStatus",
-        onDone: [
-          {
-            guard: ({ event }) => event.output === "notLoggedIn",
-            target: "loadingGuestLogin",
-            actions: assign({
-              loginStatus: "notLoggedIn",
-              // 自动游客登录仍属于初始化流程，完成前不标记 initialized。
-              hasInitialized: false,
-              errorMessage: null,
-            }),
-          },
-          {
-            target: "idle", // ← init 完回 idle（从 storage 拿到 loginStatus 后落地）
-            actions: assign({
-              loginStatus: ({ event }) => event.output,
-              hasInitialized: true,
-              errorMessage: null,
-            }),
-          },
-        ],
+        onDone: {
+          target: "idle", // ← init 完回 idle（从 storage 拿到 loginStatus 后落地）
+          actions: assign({
+            loginStatus: ({ event }) => event.output,
+            hasInitialized: true,
+            errorMessage: null,
+          }),
+        },
         onError: {
           target: "idle",
           actions: assign({