diff --git a/Assets/Plugins/Android/AndroidManifest.xml b/Assets/Plugins/Android/AndroidManifest.xml
index e85a95c..b59e5f9 100644
--- a/Assets/Plugins/Android/AndroidManifest.xml
+++ b/Assets/Plugins/Android/AndroidManifest.xml
@@ -1,7 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    package="com.photonmatrix.photonmatrix">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" package="com.photonmatrix.photonmatrix">
   <!-- 网络权限 -->
   <uses-permission android:name="android.permission.INTERNET" />
   <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
@@ -39,6 +37,13 @@
         <data android:scheme="com.googleusercontent.apps.785438724947-kpjbqi43hbj6eddianbjsgkgkkclkfmd" />
       </intent-filter>
     </activity>
+    <!-- 禁用 Firebase 自动初始化：FirebaseInitProvider 等 ContentProvider 会在冷启动时自动初始化 Firebase 并访问 Google 服务，
+         在无 GMS/关闭谷歌服务的国内设备上会导致启动闪退。移除后 Firebase 改为由 C# 在真正需要时(点谷歌/苹果登录)才初始化。 -->
+    <provider android:name="com.google.firebase.provider.FirebaseInitProvider" android:authorities="com.photonmatrix.photonmatrix.firebaseinitprovider" tools:node="remove" />
+    <provider android:name="com.google.android.gms.measurement.AppMeasurementInitializer" tools:node="remove" />
+    <provider android:name="com.google.android.gms.measurement.AppMeasurementContentProvider" tools:node="remove" />
+    <!-- 禁用 Firebase Analytics 自动采集，配合块 provider 移除，确保不触发原生初始化 -->
+    <meta-data android:name="firebase_analytics_collection_enabled" android:value="false" tools:node="replace" />
     <!-- Firebase 配置 -->
     <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
     <!-- 如果你使用 Firebase Messaging，需要添加 -->
diff --git a/Assets/Scenes/MainScene.unity b/Assets/Scenes/MainScene.unity
index 246d066..ef67db3 100644
--- a/Assets/Scenes/MainScene.unity
+++ b/Assets/Scenes/MainScene.unity
@@ -485,7 +485,7 @@ MonoBehaviour:
   - https://nextreal.cn/photon-matrix-api
   - https://api.photonmatrixlab.com
   serverBaseUrl: https://api.photonmatrixlab.com
-  enableServerBackdoor: 1
+  enableServerBackdoor: 0
   backdoorTapCount: 5
   backdoorTapInterval: 1
   defaultTimeout: 30
diff --git a/Assets/Scripts/Managers/FirebaseAuthManager.cs b/Assets/Scripts/Managers/FirebaseAuthManager.cs
index c7e6c2e..01651d0 100644
--- a/Assets/Scripts/Managers/FirebaseAuthManager.cs
+++ b/Assets/Scripts/Managers/FirebaseAuthManager.cs
@@ -36,7 +36,9 @@ namespace Kill.Managers
         private void Awake()
         {
             Instance = this;
-            InitializeFirebase();
+            // 不在此处初始化 Firebase。
+            // 国内无 Google 服务的设备上，启动即初始化 Firebase 会闪退，
+            // 因此改为懒加载：在真正用到 Firebase（谷歌/苹果登录）时才初始化。
             InitializeAppleAuth();
         }
 
@@ -45,30 +47,74 @@ namespace Kill.Managers
             appleAuthManager?.Update();
         }
 
+        // Firebase 是否已初始化完成
+        private bool firebaseReady;
+        // 初始化是否已开始（防止并发重复初始化）
+        private bool firebaseInitStarted;
+        // 等待初始化完成的回调队列
+        private readonly List<Action> pendingReady = new List<Action>();
+
         /// <summary>
-        /// 初始化 Firebase
+        /// 懒加载：确保 Firebase 已初始化，未初始化则先初始化，完成后在主线程回调 onReady。
         /// </summary>
-        private void InitializeFirebase()
+        private void EnsureFirebaseReady(Action onReady)
+        {
+            if (onReady == null) return;
+
+            if (firebaseReady)
+            {
+                onReady();
+                return;
+            }
+            if (firebaseInitStarted)
+            {
+                pendingReady.Add(onReady);
+                return;
+            }
+
+            firebaseInitStarted = true;
+            pendingReady.Add(onReady);
+            StartFirebaseInit();
+        }
+
+        private void StartFirebaseInit()
         {
 #if (UNITY_ANDROID || UNITY_IOS) && !UNITY_EDITOR
             FirebaseApp.CheckAndFixDependenciesAsync().ContinueWith(task =>
             {
                 var dependencyStatus = task.Result;
-                if (dependencyStatus == DependencyStatus.Available)
+                MainThread.Enqueue(() =>
                 {
-                    auth = FirebaseAuth.DefaultInstance;
-                    Debug.Log("Firebase 初始化成功");
-                }
-                else
-                {
-                    Debug.LogError($"Firebase 初始化失败: {dependencyStatus}");
-                }
+                    firebaseReady = dependencyStatus == DependencyStatus.Available;
+                    if (firebaseReady)
+                    {
+                        auth = FirebaseAuth.DefaultInstance;
+                        Debug.Log("Firebase 初始化成功");
+                    }
+                    else
+                    {
+                        Debug.LogError($"Firebase 初始化失败: {dependencyStatus}，第三方登录不可用");
+                    }
+                    FlushPending();
+                });
             });
 #else
-            Debug.Log("Firebase 第三方登录仅在 Android / iOS 平台可用");
+            FlushPending();
 #endif
         }
 
+        /// <summary>
+        /// 回调所有等待初始化完成的调用
+        /// </summary>
+        private void FlushPending()
+        {
+            var callbacks = pendingReady.ToArray();
+            pendingReady.Clear();
+            firebaseInitStarted = false;
+            foreach (var cb in callbacks)
+                cb?.Invoke();
+        }
+
         /// <summary>
         /// 初始化 Apple Sign In
         /// </summary>
@@ -90,7 +136,11 @@ namespace Kill.Managers
         /// </summary>
         public void SignInWithGoogle(Action<GoogleLoginResult> onSuccess, Action<string> onError, int timeoutSeconds = 30)
         {
-            SignInWithProvider("google.com", new string[] { "email", "profile" }, onSuccess, onError, timeoutSeconds);
+            // 懒加载：仅在用户主动点谷歌登录时才初始化 Firebase，未初始化则先初始化
+            EnsureFirebaseReady(() =>
+            {
+                SignInWithProvider("google.com", new string[] { "email", "profile" }, onSuccess, onError, timeoutSeconds);
+            });
         }
 
         /// <summary>
@@ -98,6 +148,15 @@ namespace Kill.Managers
         /// </summary>
         public void SignInWithApple(Action<GoogleLoginResult> onSuccess, Action<string> onError, int timeoutSeconds = 30)
         {
+            // 懒加载：与谷歌登录同理，iOS 上 Firebase 也按需初始化
+            EnsureFirebaseReady(() => SignInWithAppleInternal(onSuccess, onError));
+        }
+
+        /// <summary>
+        /// 苹果登录真正实现（须在 Firebase 初始化完成后调用）
+        /// </summary>
+        private void SignInWithAppleInternal(Action<GoogleLoginResult> onSuccess, Action<string> onError)
+        {
 #if UNITY_IOS && !UNITY_EDITOR
             if (appleAuthManager == null)
             {