@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
        }
        
        .gradient-bg {
            background: linear-gradient(135deg, #0078D7 0%, #00A4EF 100%);
        }
        
        .card-hover {
            transition: all 0.3s ease;
        }
        
        .card-hover:hover {
            transform: translateY(-5px);
        }
        
        .download-button {
            transition: all 0.3s ease;
        }
        
        .download-button:hover {
            transform: scale(1.05);
            box-shadow: 0 10px 25px rgba(0, 120, 215, 0.3);
        }
        
        .sticky-download {
            animation: bounce 2s infinite;
        }
        
        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% {
                transform: translateY(0);
            }
            40% {
                transform: translateY(-10px);
            }
            60% {
                transform: translateY(-5px);
            }
        }
        
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.7);
            animation: fadeIn 0.3s ease;
        }
        
        .modal-content {
            background-color: #fff;
            margin: 10% auto;
            padding: 20px;
            border-radius: 10px;
            width: 80%;
            max-width: 400px;
            text-align: center;
            animation: slideIn 0.3s ease;
        }
        
        @keyframes fadeIn {
            from {opacity: 0;}
            to {opacity: 1;}
        }
        
        @keyframes slideIn {
            from {transform: translateY(-50px); opacity: 0;}
            to {transform: translateY(0); opacity: 1;}
        }
        
        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
            cursor: pointer;
        }
        
        .close:hover,
        .close:focus {
            color: #000;
            text-decoration: none;
        }
        
        .feature-icon {
            transition: all 0.3s ease;
        }
        
        .feature-card:hover .feature-icon {
            transform: scale(1.2);
            color: #0078D7;
        }
        
        .timeline {
            position: relative;
        }
        
        .timeline::after {
            content: '';
            position: absolute;
            width: 2px;
            background-color: #0078D7;
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -1px;
        }
        
        .timeline-item {
            position: relative;
            width: 50%;
            padding: 10px 40px;
        }
        
        .timeline-item::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            background-color: #fff;
            border: 4px solid #0078D7;
            border-radius: 50%;
            top: 15px;
            z-index: 1;
        }
        
        .timeline-left {
            left: 0;
        }
        
        .timeline-right {
            left: 50%;
        }
        
        .timeline-left::after {
            right: -10px;
        }
        
        .timeline-right::after {
            left: -10px;
        }
        
        @media screen and (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            
            .timeline-item::after {
                left: 21px;
            }
            
            .timeline-right {
                left: 0;
            }
        }
        
        .progress-bar {
            height: 8px;
            background-color: #e0e0e0;
            border-radius: 4px;
            overflow: hidden;
        }
        
        .progress-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, #0078D7 0%, #00A4EF 100%);
            border-radius: 4px;
            transition: width 0.5s ease;
        }
        
        .testimonial-card {
            transition: all 0.3s ease;
        }
        
        .testimonial-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }