diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 0a1176e6..3106721c 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,8 +5,13 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="02f9b0c7-a97d-4689-afaa-3f6563382100" name="更改" comment="docs(NOI竞赛大纲): 添加 C++ 程序设计基础文档&#10;&#10;- 新增程序基本概念、基本数据类型、程序基本语句等文档&#10;- 更新 mkdocs.yml 配置，优化文档结构- 调整部分文档路径，提高可读性">
-      <change afterPath="$PROJECT_DIR$/_static/css/extra.css" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/_static/css/extra.css" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/notebook/mkdocs.yml" beforeDir="false" afterPath="$PROJECT_DIR$/notebook/mkdocs.yml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/notebook/themes/css/custom.css" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/notebook/themes/js/auto-render.min.js" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/notebook/themes/js/katex.js" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/notebook/themes/js/katex.min.js" beforeDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -222,7 +227,15 @@
       <option name="project" value="LOCAL" />
       <updated>1745049298628</updated>
     </task>
-    <option name="localTasksCounter" value="15" />
+    <task id="LOCAL-00015" summary="docs(NOI竞赛大纲): 添加 C++ 程序设计基础文档&#10;&#10;- 新增程序基本概念、基本数据类型、程序基本语句等文档&#10;- 更新 mkdocs.yml 配置，优化文档结构- 调整部分文档路径，提高可读性">
+      <option name="closed" value="true" />
+      <created>1745050518394</created>
+      <option name="number" value="00015" />
+      <option name="presentableId" value="LOCAL-00015" />
+      <option name="project" value="LOCAL" />
+      <updated>1745050518394</updated>
+    </task>
+    <option name="localTasksCounter" value="16" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
diff --git a/_static/css/extra.css b/_static/css/extra.css
deleted file mode 100644
index 723a324b..00000000
--- a/_static/css/extra.css
+++ /dev/null
@@ -1,10 +0,0 @@
-/* 修改夜间模式背景为灰色 */
-@media (prefers-color-scheme: dark) {
-  :root {
-    --md-default-bg-color: #2e2e2e;    /* 页面主体背景 */
-    --md-footer-bg-color: #2e2e2e;     /* 页脚 */
-    --md-header-bg-color: #2e2e2e;     /* 顶部导航栏 */
-    --md-code-bg-color: #3a3a3a;       /* 代码块背景（可选） */
-    --md-typeset-color: #e0e0e0;       /* 正文字体颜色（增强对比） */
-  }
-}
diff --git a/notebook/mkdocs.yml b/notebook/mkdocs.yml
index e00191d1..fe6319cf 100644
--- a/notebook/mkdocs.yml
+++ b/notebook/mkdocs.yml
@@ -74,7 +74,7 @@ theme:
         name: 切换到夜间模式
     - media: "(prefers-color-scheme: dark)"
       scheme: slate
-      primary: blue
+      primary: grey
       accent: blue
       toggle:
         icon: material/weather-night
@@ -124,5 +124,4 @@ markdown_extensions:
 extra_javascript:
   - https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js
 
-extra_css:
-  - _static/css/extra.css
+
diff --git a/notebook/themes/css/custom.css b/notebook/themes/css/custom.css
deleted file mode 100644
index 88c6e5d7..00000000
--- a/notebook/themes/css/custom.css
+++ /dev/null
@@ -1 +0,0 @@
-body { font-family: 'Microsoft YaHei', sans-serif; }
\ No newline at end of file
diff --git a/notebook/themes/js/auto-render.min.js b/notebook/themes/js/auto-render.min.js
deleted file mode 100644
index 56377a19..00000000
--- a/notebook/themes/js/auto-render.min.js
+++ /dev/null
@@ -1 +0,0 @@
-// auto-render.min.js placeholder for offline use
\ No newline at end of file
diff --git a/notebook/themes/js/katex.js b/notebook/themes/js/katex.js
deleted file mode 100644
index eb50e4b5..00000000
--- a/notebook/themes/js/katex.js
+++ /dev/null
@@ -1,9 +0,0 @@
-document$.subscribe(() => {
-  renderMathInElement(document.body, {
-    delimiters: [
-      {left: "$$", right: "$$", display: true},
-      {left: "$", right: "$", display: false}
-    ],
-    throwOnError: false
-  });
-});
diff --git a/notebook/themes/js/katex.min.js b/notebook/themes/js/katex.min.js
deleted file mode 100644
index cc656dea..00000000
--- a/notebook/themes/js/katex.min.js
+++ /dev/null
@@ -1 +0,0 @@
-// katex.min.js placeholder for offline use
\ No newline at end of file