* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            text-align: center;
            padding: 40px 0 30px;
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            color: white;
            border-radius: 12px;
            margin-bottom: 40px;
            box-shadow: 0 10px 30px rgba(106, 17, 203, 0.2);
        }
        
        h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            font-weight: 700;
        }
        
        .subtitle {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto;
            opacity: 0.9;
        }
        
        .invite-code-example {
            display: flex;
            justify-content: center;
            align-items: center;
            margin: 30px auto;
            max-width: 600px;
        }
        
        .code-box {
            background-color: rgba(255, 255, 255, 0.15);
            padding: 20px 40px;
            border-radius: 10px;
            font-family: 'Courier New', monospace;
            font-size: 2rem;
            letter-spacing: 3px;
            font-weight: bold;
            border: 2px dashed rgba(255, 255, 255, 0.4);
            margin-right: 20px;
        }
        
        .get-code-section {
            background-color: #fff;
            border-radius: 12px;
            padding: 30px;
            margin: 40px auto;
            max-width: 800px;
            text-align: center;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
        }
        
        .get-code-btn {
            display: inline-block;
            background: linear-gradient(135deg, #6a11cb, #2575fc);
            color: white;
            padding: 15px 30px;
            border-radius: 8px;
            font-weight: bold;
            text-decoration: none;
            margin-top: 20px;
            transition: all 0.3s;
        }
        
        .get-code-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(106, 17, 203, 0.2);
        }
        
        .content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }
        
        .card {
            background-color: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.08);
        }
        
        .card h2 {
            color: #6a11cb;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.6rem;
        }
        
        .card h2 i {
            font-size: 1.8rem;
        }
        
        .card ul {
            list-style-type: none;
        }
        
        .card li {
            margin-bottom: 10px;
            padding-left: 10px;
            border-left: 3px solid #f0f0f0;
            padding-left: 15px;
        }
        
        .card li strong {
            color: #2575fc;
        }
        
        footer {
            text-align: center;
            padding: 30px 0;
            margin-top: 50px;
            color: #666;
            border-top: 1px solid #eee;
            font-size: 0.9rem;
        }
        
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            
            .content {
                grid-template-columns: 1fr;
            }
        }