diff --git a/admin/addapp.php b/admin/addapp.php
index a85a6de..8d3c00c 100644
--- a/admin/addapp.php
+++ b/admin/addapp.php
@@ -153,9 +153,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_app'])) {
 
         <h2>添加App</h2>
         <form method="post" enctype="multipart/form-data">
-            <div class="mb-3">
-                <label for="name" class="form-label">App名称</label>
+            <div class="form-floating mb-3">
                 <input type="text" class="form-control" id="name" name="name" required>
+                <label for="name">App名称</label>
             </div>
             <div class="mb-3">
                 <label for="tags" class="form-label">标签</label>
@@ -169,9 +169,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_app'])) {
                 </select>
                 <small class="form-text text-muted">按住Ctrl键可选择多个标签</small>
             </div>
-            <div class="mb-3">
-                <label for="description" class="form-label">描述</label>
+            <div class="form-floating mb-3">
                 <textarea class="form-control" id="description" name="description" rows="3" required></textarea>
+                <label for="description">描述</label>
             </div>
             <div class="mb-3">
                 <label for="age_rating" class="form-label">年龄分级</label>
@@ -182,9 +182,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_app'])) {
                     <option value="17+">17+</option>
                 </select>
           </div>
-          <div class="mb-3" id="ageRatingDescriptionGroup" style="display: none;">
-              <label for="age_rating_description" class="form-label">年龄分级说明</label>
+          <div class="form-floating mb-3" id="ageRatingDescriptionGroup" style="display: none;">
               <textarea class="form-control" id="age_rating_description" name="age_rating_description" rows="3" placeholder="请说明为何需要此年龄分级"></textarea>
+              <label for="age_rating_description">年龄分级说明</label>
               <div class="form-text">当年龄分级为12+或以上时，此项为必填</div>
           </div>
 
@@ -235,21 +235,21 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_app'])) {
                     </div>
                 </div>
             </div>
-            <div class="mb-3">
-                <label for="version" class="form-label">版本号</label>
+            <div class="form-floating mb-3">
                 <input type="text" class="form-control" id="version" name="version" required>
+                <label for="version">版本号</label>
             </div>
-            <div class="mb-3">
-                <label for="changelog" class="form-label">更新日志</label>
+            <div class="form-floating mb-3">
                 <textarea class="form-control" id="changelog" name="changelog" rows="3" required></textarea>
+                <label for="changelog">更新日志</label>
             </div>
-            <div class="mb-3">
-                <label for="app_file" class="form-label">App文件</label>
+            <div class="form-floating mb-3">
                 <input class="form-control" type="file" id="app_file" name="app_file" required>
+                <label for="app_file">App文件</label>
             </div>
-            <div class="mb-3">
-                <label for="images" class="form-label">预览图片 (可多选)</label>
+            <div class="form-floating mb-3">
                 <input class="form-control" type="file" id="images" name="images[]" multiple>
+                <label for="images">预览图片 (可多选)</label>
             </div>
             <button type="submit" class="btn btn-primary" name="add_app">添加App</button>
             <a href="index.php" class="btn btn-secondary ms-2">取消</a>
diff --git a/admin/editapp.php b/admin/editapp.php
index 011f0e6..c0bda02 100644
--- a/admin/editapp.php
+++ b/admin/editapp.php
@@ -162,9 +162,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['edit_app'])) {
 
         <h2>编辑App: <?php echo htmlspecialchars($app['name']); ?></h2>
         <form method="post" enctype="multipart/form-data">
-            <div class="mb-3">
-                <label for="name" class="form-label">App名称</label>
+            <div class="form-floating mb-3">
                 <input type="text" class="form-control" id="name" name="name" value="<?php echo htmlspecialchars($app['name']); ?>" required>
+                <label for="name">App名称</label>
             </div>
         <div class="mb-3">
             <label for="tags" class="form-label">标签</label>
@@ -188,9 +188,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['edit_app'])) {
             </select>
             <div class="form-text">按住Ctrl键可选择多个标签</div>
         </div>
-        <div class="mb-3">
-                <label for="description" class="form-label">描述</label>
+        <div class="form-floating mb-3">
                 <textarea class="form-control" id="description" name="description" rows="3" required><?php echo htmlspecialchars($app['description']); ?></textarea>
+                <label for="description">描述</label>
             </div>
             <div class="mb-3">
                 <label for="age_rating" class="form-label">年龄分级</label>
@@ -275,14 +275,14 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['edit_app'])) {
                     </div>
                 </div>
             </div>
-            <div class="mb-3">
-                <label for="version" class="form-label">新版本号</label>
+            <div class="form-floating mb-3">
                 <input type="text" class="form-control" id="version" name="version" placeholder="如: 1.0.1">
+                <label for="version">新版本号</label>
                 <div class="form-text">仅在上传新安装包时填写</div>
             </div>
-            <div class="mb-3">
-                <label for="changelog" class="form-label">更新日志</label>
+            <div class="form-floating mb-3">
                 <textarea class="form-control" id="changelog" name="changelog" rows="3" placeholder="描述本次更新内容"></textarea>
+                <label for="changelog">更新日志</label>
             </div>
             <div class="mb-3">
                 <label for="app_file" class="form-label">新App文件 (可选)</label>
diff --git a/admin/manage_developers.php b/admin/manage_developers.php
index f9c9aa9..5e3d703 100644
--- a/admin/manage_developers.php
+++ b/admin/manage_developers.php
@@ -227,14 +227,14 @@ if (!$stmt) {
                 <div class="card-body">
                     <form method="post" action="manage_developers.php">
                         <input type="hidden" name="user_id" value="<?php echo $editUser['id']; ?>">
-                        <div class="mb-3">
-                            <label for="username" class="form-label">用户名</label>
-                            <input type="text" id="username" name="username" value="<?php echo htmlspecialchars($editUser['username']); ?>" class="form-control" required>
-                        </div>
-                        <div class="mb-3">
-                            <label for="email" class="form-label">邮箱</label>
-                            <input type="email" id="email" name="email" value="<?php echo htmlspecialchars($editUser['email']); ?>" class="form-control" required>
-                        </div>
+                        <div class="form-floating mb-3">
+                <input type="text" class="form-control" id="username" name="username" value="<?php echo htmlspecialchars($editUser['username']); ?>" required>
+                <label for="username">用户名</label>
+            </div>
+                        <div class="form-floating mb-3">
+                <input type="email" class="form-control" id="email" name="email" value="<?php echo htmlspecialchars($editUser['email']); ?>" required>
+                <label for="email">邮箱</label>
+            </div>
                         <button type="submit" name="update_user" class="btn btn-primary me-2">更新用户</button>
                         <a href="manage_developers.php" class="btn btn-secondary">取消</a>
                     </form>
diff --git a/admin/manage_tags.php b/admin/manage_tags.php
index 3bf228d..d6350a4 100644
--- a/admin/manage_tags.php
+++ b/admin/manage_tags.php
@@ -80,9 +80,9 @@ $tagsResult = $conn->query("SELECT * FROM tags ORDER BY created_at DESC");
             </div>
             <div class="card-body">
                 <form method="post">
-                    <div class="mb-3">
-                        <label for="tag_name" class="form-label">标签名称</label>
+                    <div class="form-floating mb-3">
                         <input type="text" class="form-control" id="tag_name" name="tag_name" required>
+                        <label for="tag_name">标签名称</label>
                     </div>
                     <button type="submit" name="add_tag" class="btn btn-primary">添加标签</button>
                 </form>
@@ -130,9 +130,9 @@ $tagsResult = $conn->query("SELECT * FROM tags ORDER BY created_at DESC");
                                     <div class="modal-body">
                                         <form method="post">
                                             <input type="hidden" name="tag_id" value="<?php echo $tag['id']; ?>">
-                                            <div class="mb-3">
-                                                <label for="edit_tag_name<?php echo $tag['id']; ?>" class="form-label">标签名称</label>
+                                            <div class="form-floating mb-3">
                                                 <input type="text" class="form-control" id="edit_tag_name<?php echo $tag['id']; ?>" name="tag_name" value="<?php echo htmlspecialchars($tag['name']); ?>" required>
+                                                <label for="edit_tag_name<?php echo $tag['id']; ?>">标签名称</label>
                                             </div>
                                             <div class="modal-footer">
                                                 <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">取消</button>
diff --git a/admin/manage_versions.php b/admin/manage_versions.php
index 6f9fd17..358bc73 100644
--- a/admin/manage_versions.php
+++ b/admin/manage_versions.php
@@ -285,14 +285,14 @@ if (isset($_GET['success'])) {
                                 <form method="post" enctype="multipart/form-data">
                                     <div class="modal-body">
                                         <input type="hidden" name="version_id" value="<?php echo $version['id']; ?>">
-                                        <div class="mb-3">
-                                            <label for="version_<?php echo $version['id']; ?>" class="form-label">版本号</label>
-                                            <input type="text" class="form-control" id="version_<?php echo $version['id']; ?>" name="version" value="<?php echo htmlspecialchars($version['version']); ?>" required>
-                                        </div>
-                                        <div class="mb-3">
-                                            <label for="changelog_<?php echo $version['id']; ?>" class="form-label">更新日志</label>
-                                            <textarea class="form-control" id="changelog_<?php echo $version['id']; ?>" name="changelog" rows="3" required><?php echo htmlspecialchars($version['changelog']); ?></textarea>
-                                        </div>
+                                        <div class="form-floating mb-3">
+                <input type="text" class="form-control" id="version_<?php echo $version['id']; ?>" name="version" value="<?php echo htmlspecialchars($version['version']); ?>" required>
+                <label for="version_<?php echo $version['id']; ?>">版本号</label>
+            </div>
+                                        <div class="form-floating mb-3">
+                <textarea class="form-control" id="changelog_<?php echo $version['id']; ?>" name="changelog" rows="3" required><?php echo htmlspecialchars($version['changelog']); ?></textarea>
+                <label for="changelog_<?php echo $version['id']; ?>">更新日志</label>
+            </div>
                                         <div class="mb-3">
                                             <label for="new_app_file_<?php echo $version['id']; ?>" class="form-label">更新App文件 (可选)</label>
                                             <input class="form-control" type="file" id="new_app_file_<?php echo $version['id']; ?>" name="new_app_file">
@@ -322,14 +322,14 @@ if (isset($_GET['success'])) {
                 </div>
                 <form method="post" enctype="multipart/form-data">
                     <div class="modal-body">
-                        <div class="mb-3">
-                            <label for="version" class="form-label">版本号</label>
-                            <input type="text" class="form-control" id="version" name="version" placeholder="如: 1.0.0" required>
-                        </div>
-                        <div class="mb-3">
-                            <label for="changelog" class="form-label">更新日志</label>
-                            <textarea class="form-control" id="changelog" name="changelog" rows="3" placeholder="描述本次更新内容" required></textarea>
-                        </div>
+                        <div class="form-floating mb-3">
+                <input type="text" class="form-control" id="version" name="version" placeholder="如: 1.0.0" required>
+                <label for="version">版本号</label>
+            </div>
+                        <div class="form-floating mb-3">
+                <textarea class="form-control" id="changelog" name="changelog" rows="3" placeholder="描述本次更新内容" required></textarea>
+                <label for="changelog">更新日志</label>
+            </div>
                         <div class="mb-3">
                             <label for="app_file" class="form-label">App文件</label>
                             <input class="form-control" type="file" id="app_file" name="app_file" required>
diff --git a/admin/review_apps.php b/admin/review_apps.php
index ef30b21..507ec0d 100644
--- a/admin/review_apps.php
+++ b/admin/review_apps.php
@@ -183,9 +183,9 @@ if (!($conn instanceof mysqli)) {
                                 <form method="post">
                                     <div class="modal-body">
                                         <input type="hidden" name="app_id" value="<?php echo $app['id']; ?>">
-                                        <div class="mb-3">
-                                            <label for="rejection_reason<?php echo $app['id']; ?>" class="form-label">拒绝原因</label>
+                                        <div class="form-floating mb-3">
                                             <textarea class="form-control" id="rejection_reason<?php echo $app['id']; ?>" name="rejection_reason" rows="3" required></textarea>
+                                            <label for="rejection_reason<?php echo $app['id']; ?>">拒绝原因</label>
                                             <div class="form-text">请详细说明拒绝原因，帮助开发者改进应用</div>
                                         </div>
                                     </div>
diff --git a/developer/register.php b/developer/register.php
index 884a2cc..1f848b6 100644
--- a/developer/register.php
+++ b/developer/register.php
@@ -105,17 +105,17 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
             <div class="alert alert-danger" role="alert"><?php echo $error; ?></div>
         <?php endif; ?>
         <form method="post">
-            <div class="mb-3">
-                <label for="username" class="form-label">用户名</label>
-                <input type="text" id="username" name="username" class="form-control" required>
+            <div class="form-floating mb-3">
+                <input type="text" class="form-control" id="username" name="username" required>
+                <label for="username">用户名</label>
             </div>
-            <div class="form-group">
-                <label for="email" class="form-label">邮箱</label>
-                <input type="email" id="email" name="email" class="form-control" required>
+            <div class="form-floating mb-3">
+                <input type="email" class="form-control" id="email" name="email" required>
+                <label for="email">邮箱</label>
             </div>
-            <div class="mb-3">
-                <label for="password" class="form-label">密码</label>
-                <input type="password" id="password" name="password" class="form-control" required>
+            <div class="form-floating mb-3">
+                <input type="password" class="form-control" id="password" name="password" required>
+                <label for="password">密码</label>
             </div>
             <div class="mb-3 form-check">
                 <input type="checkbox" class="form-check-input" id="agree" name="agree" required>
diff --git a/tags.php b/tags.php
index fe2a0f8..78726f0 100644
--- a/tags.php
+++ b/tags.php
@@ -123,7 +123,10 @@ $tagResult = $conn->query("SELECT id, name FROM tags ORDER BY name");
         <form method="get" action="tags.php" class="mb-4">
             <div class="row g-3">
                 <div class="col-md-6">
-                    <input type="text" name="search" class="form-control" placeholder="搜索应用..." value="<?php echo isset($_GET['search']) ? htmlspecialchars($_GET['search']) : ''; ?>">
+                    <div class="form-floating">
+                        <input type="text" name="search" class="form-control" id="searchInput" placeholder="搜索应用..." value="<?php echo isset($_GET['search']) ? htmlspecialchars($_GET['search']) : ''; ?>">
+                        <label for="searchInput">搜索应用...</label>
+                    </div>
                 </div>
                 <div class="col-md-2">
                     <button class="btn btn-primary w-100" type="submit">搜索</button>