@media screen and (max-width: 768px) {
   .sidebar {
     width: 100%;
     height: auto;
     position: relative;
   }
   
   .sidebar-toggle {
     display: block;
   }
   
   .content {
     margin-left: 0;
   }
 }
 nav.app-nav {
   position: relative;
   z-index: 1000; /* 确保导航栏在其他元素之上 */
 }
  .markdown-section {
   margin: 0 auto;
   max-width: 1350px;
   padding: 60px 15px 40px; /* 增加顶部padding值 */
   position: relative;
 }
     @media screen and (max-width: 768px) {
       .markdown-section {
         padding-top: 80px; /* 在小屏幕上增加更多顶部空间 */
       }
     }