:root {
            --primary-color: #0066cc;
            --secondary-color: #004c99;
            --accent-color: #00aaff;
            --text-color: #333333;
            --light-bg: #f5f9ff;
            --dark-bg: #001a33;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: var(--text-color);
            background-color: #ffffff;
            scroll-behavior: smooth;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 10px 15px -3px rgba(0, 102, 204, 0.3);
        }
        
        .btn-secondary {
            background-color: white;
            color: var(--primary-color);
            border: 2px solid var(--primary-color);
            transition: all 0.3s ease;
        }
        
        .btn-secondary:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-2px);
        }
        
        .card {
            transition: all 0.3s ease;
            border-radius: 10px;
            overflow: hidden;
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            color: white;
            padding: 5rem 0;
            position: relative;
            overflow: hidden;
        }
        
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -100px;
            left: 0;
            width: 100%;
            height: 200px;
            background: white;
            border-radius: 50% 50% 0 0;
        }
        
        .download-float-btn {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1000;
            background-color: var(--accent-color);
            color: white;
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: 0 10px 15px -3px rgba(0, 170, 255, 0.5);
            transition: all 0.3s ease;
        }
        
        .download-float-btn:hover {
            transform: scale(1.1);
            background-color: var(--primary-color);
        }
        
        .section-title {
            position: relative;
            display: inline-block;
            margin-bottom: 2rem;
            font-weight: 700;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
        }
        
        .tab-button {
            padding: 0.75rem 1.5rem;
            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: 600;
        }
        
        .faq-item {
            border-bottom: 1px solid #e5e7eb;
            padding: 1.5rem 0;
        }
        
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        
        .faq-question:hover {
            color: var(--primary-color);
        }
        
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        
        .faq-answer.active {
            max-height: 500px;
            margin-top: 1rem;
        }
        
        .testimonial-card {
            background-color: #f9f9f9;
            border-left: 4px solid var(--primary-color);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            border-radius: 0 8px 8px 0;
        }
        
        .testimonial-author {
            display: flex;
            align-items: center;
            margin-top: 1rem;
        }
        
        .testimonial-author img {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            margin-right: 1rem;
        }
        
        .download-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 2000;
            justify-content: center;
            align-items: center;
        }
        
        .download-modal-content {
            background-color: white;
            padding: 2rem;
            border-radius: 10px;
            width: 90%;
            max-width: 500px;
            text-align: center;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        
        .qr-code {
            margin: 1.5rem 0;
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .hero-section {
                padding: 3rem 0;
            }
            
            .download-float-btn {
                bottom: 20px;
                right: 20px;
                width: 50px;
                height: 50px;
            }
            
            .section-title {
                font-size: 1.5rem;
            }
        }
        
        /* 骨架屏动画 */
        @keyframes pulse {
            0% {
                background-color: rgba(229, 231, 235, 0.7);
            }
            50% {
                background-color: rgba(229, 231, 235, 0.4);
            }
            100% {
                background-color: rgba(229, 231, 235, 0.7);
            }
        }
        
        .skeleton {
            animation: pulse 1.5s infinite;
            border-radius: 0.375rem;
        }