* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 40px 20px;
            color: #333;
        }
        
        .container {
            max-width: 800px;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .header {
            display: flex;
            align-items: center;
            margin-bottom: 40px;
            text-align: center;
            flex-direction: column;
        }
        
        .logo {
            width: 100px;
            height: 100px;
            background: linear-gradient(135deg, #5d6af6 0%, #6a3ad9 100%);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            box-shadow: 0 8px 20px rgba(93, 142, 246, 0.3);
        }
        .logo img {
            width: 80px;
            height: 80px;
            /* filter: brightness(0) invert(1); 使图标变为白色 */
        }
        .logo svg {
            width: 48px;
            height: 48px;
            fill: white;
        }
        
        .header h1 {
            font-size: 32px;
            color: #2c3e50;
            margin-bottom: 10px;
            font-weight: 600;
            letter-spacing: 1px;
        }
        
        .header p {
            color: #7f8c8d;
            font-size: 16px;
            max-width: 500px;
            line-height: 1.6;
        }
        
        .notification {
            background: #fff9e6;
            border-left: 4px solid #ffcc00;
            padding: 15px 20px;
            margin-bottom: 40px;
            border-radius: 8px;
            width: 100%;
            max-width: 600px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            display: flex;
            align-items: center;
        }
        
        .notification svg {
            width: 20px;
            height: 20px;
            fill: #ff9900;
            margin-right: 15px;
            flex-shrink: 0;
        }
        
        .notification p {
            color: #8a6d3b;
            font-size: 14px;
            line-height: 1.5;
        }
        
        .options {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 30px;
            width: 100%;
            margin-bottom: 40px;
        }
        
        .option-card {
            background: white;
            border-radius: 16px;
            padding: 30px;
            width: 100%;
            max-width: 350px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .option-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        
        .option-icon {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        
        .option-icon svg {
            width: 36px;
            height: 36px;
            fill: white;
        }
        
        .option-1 .option-icon {
            background: linear-gradient(135deg, #1143e8 0%, #5d8ef6 100%);
        }
        
        .option-2 .option-icon {
            background: linear-gradient(135deg, #9d12f9 0%, #c56cf0 100%);
        }
        
        .option-card h2 {
            font-size: 22px;
            color: #2c3e50;
            margin-bottom: 15px;
            font-weight: 600;
        }
        
        .option-card p {
            color: #7f8c8d;
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 25px;
        }
        
        .btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 16px;
            transition: all 0.3s ease;
            width: 100%;
            max-width: 220px;
            text-align: center;
            letter-spacing: 0.5px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #1143e8 0%, #5d8ef6 100%);
            color: white;
        }
        
        .btn-secondary {
            background: linear-gradient(135deg, #9d12f9 0%, #c56cf0 100%);
            color: white;
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 20px rgba(0, 0, 0, 0.15);
        }
        
        .provider {
            font-size: 12px;
            color: #95a5a6;
            margin-top: 10px;
            text-align: center;
            font-style: italic;
        }
        
        .footer {
            margin-top: 30px;
            text-align: center;
            color: #7f8c8d;
            font-size: 14px;
            padding: 20px;
            border-top: 1px solid #ecf0f1;
            width: 100%;
            max-width: 600px;
        }
        
        .logo img {
            width: 60px;
            height: 60px;
            /* filter: brightness(0) invert(1); 使图标变为白色 */
        }
        
        @media (max-width: 768px) {
            .options {
                flex-direction: column;
                align-items: center;
            }
            
            .option-card {
                max-width: 100%;
            }
            
            .header h1 {
                font-size: 26px;
            }
        }