body {
            font-family: 'Microsoft YaHei', Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        .header {
            text-align: center;
            padding: 40px 0;
            margin-bottom: 30px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        
        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        
        .header p {
            font-size: 1.2em;
            opacity: 0.9;
        }
        
        .content-wrapper {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
        }
        
        .main-content {
            flex: 3;
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            min-width: 300px;
        }
        
        .sidebar {
            flex: 1;
            background: white;
            padding: 30px;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            min-width: 250px;
        }
        
        section {
            margin-bottom: 40px;
        }
        
        h2 {
            color: #667eea;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e9ecef;
            font-size: 1.8em;
        }
        
        h3 {
            color: #764ba2;
            margin: 20px 0 15px 0;
            font-size: 1.3em;
        }
        
        p {
            margin-bottom: 15px;
            text-align: justify;
        }
        
        ul, ol {
            margin-bottom: 20px;
            padding-left: 20px;
        }
        
        li {
            margin-bottom: 10px;
        }
        
        .highlight-box {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            color: white;
            padding: 20px;
            border-radius: 10px;
            margin: 20px 0;
        }
        
        .tip-box {
            background: #e3f2fd;
            border-left: 4px solid #2196f3;
            padding: 15px;
            margin: 15px 0;
            border-radius: 5px;
        }
        
        .warning-box {
            background: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 15px;
            margin: 15px 0;
            border-radius: 5px;
        }
        
        .example-box {
            background: #f8f9fa;
            border-left: 4px solid #6c757d;
            padding: 15px;
            margin: 15px 0;
            border-radius: 5px;
        }
        
        .link-list {
            list-style: none;
            padding: 0;
        }
        
        .link-list li {
            margin-bottom: 10px;
        }
        
        .link-list a {
            display: block;
            padding: 12px 15px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            text-decoration: none;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        
        .link-list a:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
            background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
        }
        
        .card2 {
            background: white;
            border-radius: 10px;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
        }
        
        .card2:hover {
            transform: translateY(-5px);
        }
        
        @media (max-width: 768px) {
            .content-wrapper {
                flex-direction: column;
            }
            
            .header span {
                font-size: 2em;
            }
            
            .main-content,
            .sidebar {
                width: 100%;
            }
        }