diff --git a/data/settings.json b/data/settings.json
index 5ab8e46..2643fdc 100644
--- a/data/settings.json
+++ b/data/settings.json
@@ -1,7 +1,7 @@
 {
   "card_style": "compact",
   "search_history": [],
-  "theme": "dark",
+  "theme": "light",
   "bg_image": "/upload/background/5dd4f5d3cd7b48eca9967fa063ea5cd9.png",
   "dark_bg_image": "/static/background_dark.jpg",
   "site_title": "应用导航",
diff --git a/templates/attachments.html b/templates/attachments.html
index 5da66f9..23152fb 100644
--- a/templates/attachments.html
+++ b/templates/attachments.html
@@ -4,9 +4,6 @@
 
 {% block content %}
     <div class="card">
-        <div class="card-header bg-primary text-white">
-            <h4><i class="fas fa-paperclip me-2"></i>附件管理</h4>
-        </div>
         <div class="card-body">
             <div class="mb-4">
                 <h5 class="border-bottom pb-2 mb-3">上传新附件</h5>
diff --git a/templates/base.html b/templates/base.html
index e309857..9ab643f 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -13,11 +13,14 @@
     <link rel="stylesheet" href="/static/css/all.min.css">
     <style>
         body {
-            padding-top: 20px;
+            padding-top: 20px; /* 修改了这里 */
             padding-bottom: 40px;
         }
         .navbar {
             margin-bottom: 20px;
+            position: sticky; /* 新增 */
+            top: 0; /* 新增 */
+            z-index: 1020; /* 新增，确保导航栏在其他内容之上 */
         }
         .footer {
             margin-top: 40px;
diff --git a/templates/categories.html b/templates/categories.html
index c839493..f5c0f1b 100644
--- a/templates/categories.html
+++ b/templates/categories.html
@@ -4,9 +4,6 @@
 
 {% block content %}
 <div class="card">
-    <div class="card-header bg-primary text-white">
-        <h4><i class="fas fa-folder me-2"></i>分类管理</h4>
-    </div>
     <div class="card-body">
         <div class="mb-4">
             <h5>添加主分类</h5>
diff --git a/templates/manage.html b/templates/manage.html
index 0202ecf..6869959 100644
--- a/templates/manage.html
+++ b/templates/manage.html
@@ -5,14 +5,10 @@
 {% block content %}
 <div class="card">
     <div class="card-header bg-primary text-white d-flex justify-content-between align-items-center">
-        <h4><i class="fas fa-cube me-2"></i>应用管理</h4>
         <div>
             <a href="{{ url_for('add_app') }}" class="btn btn-primary btn-sm">
                 <i class="fas fa-plus"></i> 添加应用
             </a>
-            <a href="{{ url_for('manage_categories') }}" class="btn btn-secondary btn-sm">
-                <i class="fas fa-tags"></i> 管理分类
-            </a>
         </div>
     </div>
     <div class="card-body">
diff --git a/templates/settings.html b/templates/settings.html
index 6a0cae3..21d8137 100644
--- a/templates/settings.html
+++ b/templates/settings.html
@@ -4,9 +4,6 @@
 
 {% block content %}
     <div class="card">
-        <div class="card-header bg-primary text-white">
-            <h4><i class="fas fa-cog me-2"></i>系统设置</h4>
-        </div>
         <div class="card-body">
             <form method="POST" enctype="multipart/form-data" class="needs-validation" novalidate>
                 <!-- 主题设置 -->