/* CSS Document */

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1000px;/*内容容器总宽  */
            margin: 0 auto;
            padding: 0 20px;
        }
        
        .container-s {
            max-width: 1500px;/*内容容器总宽  */
            margin: 0 auto;
            padding: 0 20px;
			font-size: 0.5rem;
        }
		
        header {
            background: linear-gradient(to right, #3498db, #2c3e50);
            color: white;
            text-align: center;
            padding: 80px 0;
            margin-bottom: 30px;
            border-bottom: 5px solid #2980b9;
        }
        
        header h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }
        
        header p {
            font-size: 1.2rem;
            max-width: 600px;
            margin: 0 auto;
        }
       /* 头标题 欢迎词 welcome jyidt site  pan2025-09-17*/
        .header-wrapper {
		    background: white; 
			width: 100%; /*  */
            height: 40px; /* 为 */
          /*  margin-bottom: 10px;*/

        }

        /* 初始导航栏样式 */
        .nav-wrapper {  /*wrapper 包装袋 */
            height: 70px; /* 为导航栏保留空间 */
            margin-bottom: 10px;
       }
        
        .navbar {
            background: linear-gradient(to right, #2c3e50, #3498db);
            padding: 0 20px;
            border-radius: 5px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            transition: all 0.3s ease;
			align-items: center;
		    min-width:1100px;
            /*width: 90%;  导航栏宽，但不知如何让其居中*/
        }
        
        /* 当导航栏固定时的样式 */
        .navbar.fixed {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;/* 2025-09-18整栏离左右窗口边距 ，这是后加，当初没这项，所以改了其项的值都没有作用*/
            z-index: 1000;
            border-radius: 0;
            padding: 0 10%;
            animation: slideDown 1s ease;
			
        }
    /* 定义关键帧，为渐变色使用 */   
        @keyframes slideDown {
            from {
                transform: translateY(-100%);
            }
            to {
                transform: translateY(0);
            }
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
			width: 100%;
            height: 60px;
        }
        
        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
        }
        
        .logo i {
            margin-right: 10px;
            font-size: 2rem;
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
        }
        /* 按钮间隔间距*/        
        .nav-menu li {
            margin-left: 25px;
        }
        
        .nav-menu a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            font-size: 1.1rem;
            padding: 8px 12px;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        
        .nav-menu a:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }
        
        .nav-menu a.active {
            background-color: #e74c3c;
        }
        
        /* 内容区域样式 */
        .content {
            display: grid;
            grid-template-rows: 1fr 3fr;
            gap: 5px;
            margin-bottom: 50px;
        }
        
        .main-content {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .sidebar {
            background: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        h2 {
            color: #2c3e50;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #3498db;
        }
        
        p {
            margin-bottom: 20px;
        }
        
        .section {
            margin-bottom: 40px;
        }
        
        /* 页脚样式 */
        footer {
            background: #2c3e50;
            color: white;
            text-align: center;
            padding: 30px 0;
            margin-top: 50px;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .content {
                grid-template-columns: 1fr;
            }
            
            .nav-menu {
                display: none;
            }
            
            header h1 {
                font-size: 2.2rem;
            }
        }