* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {

            padding-top: 80px; /* 为固定导航栏留出空间 */
            background-color: #f5f5f5;
            font: 20px Helvetica Neue,Helvetica,PingFang SC,Tahoma,Arial,sans-serif;
        }
        
        /* 导航栏样式 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 75px;
            background-color: #fff;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }
        
        .nav-container {
            width: 100%;
            max-width: 1200px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 20px;
        }
        
        .logo {
            height: 50px;
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
        }
        
        .nav-menu li {
            margin-left: 20px;
        }
        
        .nav-menu a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            padding: 5px 10px;
            transition: color 0.3s;
        }
        
        .nav-menu a:hover {
            color: #0066cc;
        }
        
        /* 主要内容区域 - PC端样式 */
        .main-content {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            background-color: #fff;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
            border-radius: 5px;
        }
        
        .section {
            margin-bottom: 10px;
        }
        
        .section-header {
            position: sticky;
            top: 70px; /* 导航栏高度 */
            background-color: #fff;
            z-index: 900;
            padding: 10px 15px;
            cursor: pointer;
            border-left: 4px solid #0066cc;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }
        
        .section-header:hover {
            background-color: #f0f7ff;
        }
        
        .section-header.active {
            background-color: #e6f2ff;
        }
          .section-bidu {
            color: #e81212;
            font-size: 1.1em;
            font-weight: bold;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .section-title {
            color: #0066cc;
            font-size: 1.1em;
            font-weight: bold;
            margin: 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .section-title::after {
            content: "−";
            font-weight: bold;
            transition: transform 0.3s;
        }
        
        .section-header.collapsed .section-title::after {
            content: "+";
        }
        
        .section-content {
            padding: 15px;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        
        .section-content.collapsed {
            max-height: 0 !important;
            padding-top: 0;
            padding-bottom: 0;
        }
        .section-content p{font-family: '微软雅黑', Arial, Helvetica, 宋体, sans-serif;color: #d40000;line-height: 1.8;font-weight: bold;}

        pre {
            font-weight: bold;
            white-space: pre-wrap;
            word-wrap: break-word;
            font-family: monospace, monospace;
            background-color: transparent;
            padding: 0;
            margin: 0;
            font-size: 1em;
line-height: 30px;

        }
        
        /* 返回顶部按钮 */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: #0066cc;
            color: white;
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            cursor: pointer;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 1.2em;
            z-index: 1000;
        }
        
        .back-to-top.visible {
            opacity: 1;
        }
        
        .back-to-top:hover {
            background-color: #0055aa;
        }
        
        /* 响应式设计 - 移动端样式 */
        @media (max-width: 768px) {
            .nav-container {
                padding: 0 10px;
            }
            
            .nav-menu li {
                margin-left: 10px;
            }
            
            .main-content {
                padding: 15px 0; /* 手机上左右边距为0 */
                border-radius: 0;
                box-shadow: none;
            }
            
            .section-header {

                padding: 8px 15px; /* 保持左右内边距，使文字不贴边 */
                margin-left: 0;
            }
            
            .section-content {
                padding: 10px 5px; /* 保持左右内边距，使文字不贴边 */
            }
            
            .section-title {
                font-size: 1.2em;
            }
            
            pre {
                font-size: 15px;
line-height: 25px;
            }
            
            .back-to-top {
                width: 40px;
                height: 40px;
                font-size: 1em;
                bottom: 20px;
                right: 20px;
            }
        }