diff --git a/admin/addapp.php b/admin/addapp.php
index 29e27e8..6551185 100644
--- a/admin/addapp.php
+++ b/admin/addapp.php
@@ -112,10 +112,26 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_app'])) {
             backdrop-filter: blur(10px);
             background-color: rgba(255, 255, 255, 0.5);
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+            }
+            to {
+                opacity: 1;
+            }
+        }
     </style>
 </head>
-<body>
+<body class="page-transition">
 <?php if (isset($error)): ?>
+    <script>
+    document.addEventListener('DOMContentLoaded', function() {
+        document.body.classList.add('page-transition');
+    });
+    </script>
     <div style='color: red; padding: 10px; background-color: #ffeeee; border-radius: 5px; margin-bottom: 20px;'>
         <?php echo htmlspecialchars($error); ?>
     </div>
diff --git a/admin/login.php b/admin/login.php
index 578dc84..7a1bdd0 100644
--- a/admin/login.php
+++ b/admin/login.php
@@ -42,11 +42,27 @@ if (!isset($_SESSION['admin'])) {
             backdrop-filter: blur(10px);
             background-color: rgba(255, 255, 255, 0.5);
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+            }
+            to {
+                opacity: 1;
+            }
+        }
     </style>
     <script src="https://cdn.jsdelivr.net/npm/sweetalert2@11"></script>
 </head>
-<body>
+<body class="page-transition">
     <!-- 导航栏 -->
+    <script>
+    document.addEventListener('DOMContentLoaded', function() {
+        document.body.classList.add('page-transition');
+    });
+    </script>
     <nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top">
         <div class="container">
             <a href="../index.php"><img src="/favicon.jpeg" alt="Logo" style="height: 30px; margin-right: 10px; border-radius: var(--border-radius);"></a>
diff --git a/app.php b/app.php
index b8b14f1..ddb5e26 100644
--- a/app.php
+++ b/app.php
@@ -149,10 +149,26 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['rating'])) {
             backdrop-filter: blur(10px);
             background-color: rgba(255, 255, 255, 0.5);
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+            }
+            to {
+                opacity: 1;
+            }
+        }
     </style>
 </head>
-<body>
+<body class="page-transition">
     <!-- 导航栏 -->
+    <script>
+    document.addEventListener('DOMContentLoaded', function() {
+        document.body.classList.add('page-transition');
+    });
+    </script>
     <nav class="navbar navbar-expand-lg navbar-light blur-bg">
         <div class="container">
             <a href="index.php"><img src="/favicon.jpeg" alt="Logo" style="height: 30px; margin-right: 10px; border-radius: var(--border-radius);"></a>
diff --git a/developer/dashboard.php b/developer/dashboard.php
index 0177715..b3ae495 100644
--- a/developer/dashboard.php
+++ b/developer/dashboard.php
@@ -61,6 +61,19 @@ if (!($conn instanceof mysqli)) {
             margin: 0;
             padding: 20px;
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: translateY(20px);
+            }
+            to {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
         .dashboard-container {
             max-width: 1200px;
             margin: 0 auto;
@@ -131,7 +144,7 @@ if (!($conn instanceof mysqli)) {
         }
     </style>
 </head>
-<body>
+<body class="page-transition">
     <!-- 导航栏 -->
     <nav class="navbar navbar-expand-lg navbar-light blur-bg">
         <div class="container">
@@ -211,5 +224,10 @@ if (!($conn instanceof mysqli)) {
     </div>
     <!-- Bootstrap JS and Popper -->
     <script src="/js/bootstrap.bundle.js"></script>
+    <script>
+        document.addEventListener('DOMContentLoaded', function() {
+            document.body.classList.add('page-transition');
+        });
+    </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/developer/login.php b/developer/login.php
index 7b6fdef..48b746b 100644
--- a/developer/login.php
+++ b/developer/login.php
@@ -92,9 +92,22 @@ if (!($conn instanceof mysqli)) {
             background-color: #f4f4f4;
             padding: 20px 0;
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: translateY(20px);
+            }
+            to {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
     </style>
 </head>
-<body>
+<body class="page-transition">
     <div class="container mt-5 col-md-4">
         <h2>开发者登录</h2>
         <?php if (isset($success)): ?>
@@ -119,5 +132,10 @@ if (!($conn instanceof mysqli)) {
         </div>
     </div>
     <script src="/js/bootstrap.bundle.js"></script>
+    <script>
+        document.addEventListener('DOMContentLoaded', function() {
+            document.body.classList.add('page-transition');
+        });
+    </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/developer/profile.php b/developer/profile.php
index b3c4f7e..659dfd0 100644
--- a/developer/profile.php
+++ b/developer/profile.php
@@ -104,6 +104,19 @@ if (!($conn instanceof mysqli)) {
             margin: 0;
             padding: 20px;
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: translateY(20px);
+            }
+            to {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
         .profile-container {
             max-width: 800px;
             margin: 0 auto;
@@ -126,7 +139,7 @@ if (!($conn instanceof mysqli)) {
         }
     </style>
 </head>
-<body>
+<body class="page-transition">
     <!-- 导航栏 -->
     <nav class="navbar navbar-expand-lg navbar-light blur-bg">
         <div class="container">
@@ -182,6 +195,11 @@ if (!($conn instanceof mysqli)) {
             </div>
             <button type="submit" class="btn btn-primary">保存更改</button>
         </form>
-    </div>
+</div>
+    <script>
+        document.addEventListener('DOMContentLoaded', function() {
+            document.body.classList.add('page-transition');
+        });
+    </script>
 </body>
 </html>
diff --git a/error_pages/404.html b/error_pages/404.html
index 4feac81..dd3dc6f 100644
--- a/error_pages/404.html
+++ b/error_pages/404.html
@@ -30,14 +30,32 @@
             font-size: 1.2rem;
             margin: 1rem 0;
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: translateY(20px);
+            }
+            to {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
     </style>
 </head>
-<body>
+<body class="page-transition">
     <div class="error-container">
         <h1>404</h1>
         <h2>页面未找到</h2>
         <p>您请求的页面不存在或已被移动。</p>
         <a href="/" class="btn btn-primary mt-3">返回首页</a>
     </div>
+    <script>
+        document.addEventListener('DOMContentLoaded', function() {
+            document.body.classList.add('page-transition');
+        });
+    </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/error_pages/500.html b/error_pages/500.html
index 0101935..ec103b0 100644
--- a/error_pages/500.html
+++ b/error_pages/500.html
@@ -30,9 +30,22 @@
             font-size: 1.2rem;
             margin: 1rem 0;
         }
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: translateY(20px);
+            }
+            to {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
     </style>
 </head>
-<body>
+<body class="page-transition">
     <div class="error-container">
         <h1>500</h1>
         <h2>服务器内部错误</h2>
@@ -40,5 +53,10 @@
         <p>我们的技术团队已收到通知，正在处理此问题。</p>
         <a href="/" class="btn btn-primary mt-3">返回首页</a>
     </div>
+    <script>
+        document.addEventListener('DOMContentLoaded', function() {
+            document.body.classList.add('page-transition');
+        });
+    </script>
 </body>
 </html>
\ No newline at end of file
diff --git a/router.php b/router.php
index 7f52a74..99fd096 100644
--- a/router.php
+++ b/router.php
@@ -30,6 +30,27 @@
 
     // 为内容添加顶部内边距
     echo '<div style="padding-top: 70px;">';
+    echo '<style>
+        .page-transition {
+            animation: fadeIn 0.5s ease-in-out;
+        }
+        @keyframes fadeIn {
+            from {
+                opacity: 0;
+                transform: translateY(20px);
+            }
+            to {
+                opacity: 1;
+                transform: translateY(0);
+            }
+        }
+    </style>';
+    echo '<body class="page-transition">';
+    echo '<script>
+        document.addEventListener(\'DOMContentLoaded\', function() {
+            document.body.classList.add(\'page-transition\');
+        });
+    </script>';
     if (preg_match('/^\/api/', $_SERVER['REQUEST_URI'])) {
         include 'api.php';
         exit;
