* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f5f5f5;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        
        header {
            text-align: center;
            margin-bottom: 30px;
        }
        
        h1 {
            color: #ff4e00;
            margin-bottom: 10px;
        }
        
        .subtitle {
            color: #666;
            font-size: 16px;
        }
        
        .coupon-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 20px;
            margin-bottom: 30px;
        }
        
        .coupon-card {
            background: white;
            border-radius: 10px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            padding: 20px;
            width: calc(50% - 10px);
            transition: transform 0.3s;
            cursor: pointer;
        }
        
        .coupon-card:hover {
            transform: translateY(-5px);
        }
        
        .coupon-header {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .coupon-icon {
            width: 40px;
            height: 40px;
            margin-right: 10px;
        }
        
        .coupon-title {
            font-size: 18px;
            font-weight: bold;
        }
        
        .coupon-desc {
            color: #666;
            font-size: 14px;
            margin-bottom: 15px;
        }
        
        .qr-code {
            text-align: center;
            margin: 20px 0;
        }
        
        .qr-code img {
            width: 150px;
            height: 150px;
            border: 1px solid #eee;
        }
        
        .app-btn {
            display: block;
            background-color: #ff4e00;
            color: white;
            text-align: center;
            padding: 12px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: bold;
            margin-top: 15px;
        }
        
        .app-btn:hover {
            background-color: #e64500;
        }
        
        .notice {
            background-color: #fff8e6;
            padding: 15px;
            border-radius: 5px;
            margin-top: 30px;
            font-size: 14px;
            color: #666;
        }
        
        @media (max-width: 600px) {
            .coupon-card {
                width: 100%;
            }
            
            .desktop-only {
                display: none;
            }
        }
        
        @media (min-width: 601px) {
            .mobile-only {
                display: none;
            }
        }