/* 自定义样式 */
        :root {
            --primary-color: #007bff;
            --secondary-color: #0056b3;
            --accent-color: #00a0e9;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --success-color: #28a745;
            --warning-color: #ffc107;
            --danger-color: #dc3545;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            scroll-behavior: smooth;
        }
        
        .bg-gradient-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        }
        
        .text-gradient {
            background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .card-hover {
            transition: all 0.3s ease;
        }
        
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 123, 255, 0.4);
        }
        
        .btn-download {
            position: relative;
            overflow: hidden;
            z-index: 1;
        }
        
        .btn-download::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: all 0.6s ease;
            z-index: -1;
        }
        
        .btn-download:hover::before {
            left: 100%;
        }
        
        .sticky-download {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1000;
            transition: all 0.3s ease;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            border-radius: 50px;
            padding: 12px 24px;
            background-color: var(--primary-color);
            color: white;
            font-weight: bold;
            display: flex;
            align-items: center;
            gap: 10px;
            cursor: pointer;
        }
        
        .sticky-download:hover {
            background-color: var(--secondary-color);
            transform: scale(1.05);
        }
        
        .modal {
            display: none;
            position: fixed;
            z-index: 2000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0, 0, 0, 0.5);
            animation: fadeIn 0.3s ease;
        }
        
        .modal-content {
            background-color: #fff;
            margin: 10% auto;
            padding: 30px;
            border-radius: 10px;
            width: 80%;
            max-width: 500px;
            text-align: center;
            animation: slideIn 0.3s ease;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
        }
        
        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
            position: absolute;
            top: 15px;
            right: 20px;
            cursor: pointer;
        }
        
        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        @keyframes slideIn {
            from { transform: translateY(-50px); opacity: 0; }
            to { transform: translateY(0); opacity: 1; }
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }
        
        .tab-button {
            padding: 10px 20px;
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: all 0.3s ease;
        }
        
        .tab-button.active {
            border-bottom: 3px solid var(--primary-color);
            color: var(--primary-color);
            font-weight: bold;
        }
        
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--primary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
        }
        
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 25px;
            height: 25px;
            right: -12px;
            background-color: white;
            border: 4px solid var(--primary-color);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }
        
        .timeline-left {
            left: 0;
        }
        
        .timeline-right {
            left: 50%;
        }
        
        .timeline-left::before {
            content: " ";
            height: 0;
            position: absolute;
            top: 22px;
            width: 0;
            z-index: 1;
            right: 30px;
            border: medium solid #fff;
            border-width: 10px 0 10px 10px;
            border-color: transparent transparent transparent #fff;
        }
        
        .timeline-right::before {
            content: " ";
            height: 0;
            position: absolute;
            top: 22px;
            width: 0;
            z-index: 1;
            left: 30px;
            border: medium solid #fff;
            border-width: 10px 10px 10px 0;
            border-color: transparent #fff transparent transparent;
        }
        
        .timeline-right::after {
            left: -13px;
        }
        
        .timeline-content {
            padding: 20px 30px;
            background-color: white;
            position: relative;
            border-radius: 6px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        
        @media screen and (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            
            .timeline-item::before {
                left: 60px;
                border: medium solid #fff;
                border-width: 10px 10px 10px 0;
                border-color: transparent #fff transparent transparent;
            }
            
            .timeline-left::after, .timeline-right::after {
                left: 18px;
            }
            
            .timeline-right {
                left: 0%;
            }
        }
        
        .faq-item {
            margin-bottom: 20px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
        }
        
        .faq-question {
            background-color: #f8f9fa;
            padding: 15px 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: all 0.3s ease;
        }
        
        .faq-question:hover {
            background-color: #e9ecef;
        }
        
        .faq-answer {
            background-color: white;
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        
        .faq-answer.active {
            max-height: 500px;
            padding: 20px;
        }
        
        .rating {
            color: var(--warning-color);
        }
        
        .review-card {
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        
        .review-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .sticky-download {
                bottom: 20px;
                right: 20px;
                padding: 10px 20px;
                font-size: 0.9rem;
            }
            
            .modal-content {
                width: 90%;
                margin: 15% auto;
                padding: 20px;
            }
        }