:root {
            --primary-color: #1677ff;
            --secondary-color: #ff6a00;
            --success-color: #52c41a;
            --bg-color: #f5f5f5;
            --card-bg: white;
            --text-color: #333;
            --text-light: #666;
            --text-lighter: #999;
        }
        
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            margin: 0;
            padding: 0;
            background-color: var(--bg-color);
            color: var(--text-color);
            min-height: 100vh;
        }
        
        .container {
            max-width: 600px;
            margin: 20px auto;
            padding: 0 20px;
        }
        
        .content-box {
            background-color: var(--card-bg);
            border-radius: 16px;
            padding: 30px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
            margin-bottom: 20px;
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .content-box:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
        }
        
        .logo-container {
            display: flex;
            justify-content: center;
            margin-bottom: 20px;
        }
        
        .logo {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            box-shadow: 0 4px 12px rgba(22, 119, 255, 0.2);
            border: 2px solid white;
            background-color: white;
            padding: 5px;
        }
        
        h1 {
            color: var(--primary-color);
            margin-bottom: 30px;
            text-align: center;
            font-size: 28px;
            font-weight: 600;
            position: relative;
        }
        
        h1:after {
            content: '';
            display: block;
            width: 60px;
            height: 3px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            margin: 10px auto 0;
            border-radius: 3px;
        }
        
        .desktop-view {
            display: none;
        }
        
        .mobile-view {
            display: none;
        }
        
        .qrcode-container {
            position: relative;
            width: 220px;
            height: 220px;
            margin: 20px auto;
            padding: 15px;
            border-radius: 12px;
            background: white;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .qrcode {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }
        
        .qrcode-label {
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--primary-color);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: bold;
            box-shadow: 0 2px 8px rgba(22, 119, 255, 0.3);
        }
        
        .btn {
            display: block;
            background: linear-gradient(135deg, var(--primary-color), #1a6bff);
            color: white;
            text-decoration: none;
            padding: 14px 0;
            border-radius: 8px;
            margin: 20px 0;
            font-weight: bold;
            text-align: center;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
            font-size: 16px;
            box-shadow: 0 4px 12px rgba(22, 119, 255, 0.2);
        }
        
        .btn:hover {
            background: linear-gradient(135deg, #1268d9, #1558c9);
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(22, 119, 255, 0.3);
        }
        
        .btn:active {
            transform: translateY(0);
        }
        
        .btn-copy-container {
            display: flex;
            justify-content: center;
            margin: 20px 0;
        }
        
        .btn-copy {
            background: linear-gradient(135deg, #FF9500, #FF6A00);
            color: white;
            border: none;
            padding: 14px 30px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            box-shadow: 0 4px 15px rgba(255, 106, 0, 0.3);
            transition: all 0.3s ease;
            width: auto;
            min-width: 200px;
            position: relative;
            overflow: hidden;
        }
        
        .btn-copy:hover {
            background: linear-gradient(135deg, #FF8533, #E55F00);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 106, 0, 0.4);
        }
        
        .btn-copy:active {
            transform: translateY(0);
        }
        
        .btn-copy::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(
                90deg,
                transparent,
                rgba(255, 255, 255, 0.4),
                transparent
            );
            transition: all 0.6s ease;
        }
        
        .btn-copy:hover::before {
            left: 100%;
        }
        
        .icon-copy {
            width: 20px;
            height: 20px;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: center;
            transition: transform 0.3s;
        }
        
        .btn-copy:hover .icon-copy {
            transform: scale(1.2);
        }
        
        .code-box {
            background-color: rgba(22, 119, 255, 0.05);
            padding: 15px;
            border-radius: 8px;
            margin: 20px 0;
            font-size: 18px;
            font-weight: bold;
            color: var(--primary-color);
            word-break: break-all;
            text-align: center;
            border: 1px dashed rgba(22, 119, 255, 0.3);
            position: relative;
        }
        
        .code-box:before {
            content: '红包口令码';
            position: absolute;
            top: -10px;
            left: 15px;
            background-color: white;
            padding: 0 10px;
            font-size: 12px;
            color: var(--primary-color);
            font-weight: normal;
        }
        
        .tips {
            font-size: 14px;
            color: var(--text-lighter);
            margin-top: 30px;
            text-align: center;
            line-height: 1.6;
        }
        
        .rules {
            margin-top: 30px;
            text-align: left;
            font-size: 14px;
            color: var(--text-light);
        }
        
        .rules h3 {
            color: var(--primary-color);
            margin-bottom: 15px;
            font-size: 18px;
            position: relative;
            padding-left: 15px;
        }
        
        .rules h3:before {
            content: '';
            position: absolute;
            left: 0;
            top: 5px;
            height: 16px;
            width: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        
        .rules ul {
            padding-left: 20px;
            margin: 0;
        }
        
        .rules li {
            margin-bottom: 10px;
            position: relative;
            padding-left: 15px;
            line-height: 1.6;
        }
        
        .rules li:before {
            content: '•';
            position: absolute;
            left: 0;
            color: var(--primary-color);
        }
        
        .countdown {
            background-color: rgba(255, 106, 0, 0.1);
            color: var(--secondary-color);
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: bold;
            display: inline-block;
            margin-top: 15px;
        }
        
        .success-message {
            display: none;
            background-color: rgba(82, 196, 26, 0.1);
            color: var(--success-color);
            padding: 15px;
            border-radius: 8px;
            text-align: center;
            margin: 20px 0;
            font-size: 15px;
            animation: fadeIn 0.5s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        @media (min-width: 768px) {
            .desktop-view {
                display: block;
            }
        }
        
        @media (max-width: 767px) {
            .mobile-view {
                display: block;
            }
            
            .container {
                padding: 0 15px;
            }
            
            .content-box {
                padding: 20px;
            }
            
            h1 {
                font-size: 24px;
            }
        }
        
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }
        
        .pulse {
            animation: pulse 2s infinite;
        }
        
        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
            100% { transform: translateY(0px); }
        }
        
        .float {
            animation: float 3s ease-in-out infinite;
        }