:root {
            --primary-color: #0078D4;
            --secondary-color: #00A4EF;
            --accent-color: #50E6FF;
            --dark-color: #1E1E1E;
            --light-color: #F2F2F2;
            --success-color: #107C10;
            --warning-color: #FFB900;
            --error-color: #D83B01;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            scroll-behavior: smooth;
        }
        
        .gradient-bg {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        }
        
        .gradient-text {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-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: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            transition: all 0.3s ease;
        }
        
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 120, 212, 0.4);
        }
        
        .btn-secondary {
            background-color: var(--dark-color);
            color: white;
            transition: all 0.3s ease;
        }
        
        .btn-secondary:hover {
            background-color: #333;
            transform: translateY(-2px);
        }
        
        .btn-accent {
            background-color: var(--accent-color);
            color: var(--dark-color);
            transition: all 0.3s ease;
        }
        
        .btn-accent:hover {
            background-color: #3BC9DB;
            transform: translateY(-2px);
        }
        
        .sticky-download-btn {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1000;
            border-radius: 50px;
            padding: 15px 25px;
            font-weight: bold;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            display: flex;
            align-items: center;
            gap: 10px;
            transition: all 0.3s ease;
        }
        
        .sticky-download-btn:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .screenshot-container {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            transition: all 0.3s ease;
        }
        
        .screenshot-container:hover {
            transform: scale(1.02);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
        }
        
        .tab-button {
            padding: 10px 20px;
            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;
        }
        
        .tab-button:hover:not(.active) {
            background-color: rgba(0, 120, 212, 0.1);
        }
        
        .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;
        }
        
        .modal-content {
            background-color: white;
            border-radius: 10px;
            padding: 30px;
            max-width: 90%;
            width: 500px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            animation: modalFadeIn 0.3s ease;
        }
        
        @keyframes modalFadeIn {
            from {
                opacity: 0;
                transform: translateY(-20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .close-button {
            position: absolute;
            top: 15px;
            right: 20px;
            font-size: 24px;
            cursor: pointer;
            color: #666;
        }
        
        .close-button:hover {
            color: #333;
        }
        
        .rating-stars {
            color: #FFD700;
            font-size: 1.2rem;
        }
        
        .user-avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            object-fit: cover;
        }
        
        .timeline-item {
            position: relative;
            padding-left: 30px;
            margin-bottom: 20px;
        }
        
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background-color: var(--primary-color);
        }
        
        .timeline-item::after {
            content: '';
            position: absolute;
            left: 5px;
            top: 12px;
            width: 2px;
            height: calc(100% + 8px);
            background-color: #e5e7eb;
        }
        
        .timeline-item:last-child::after {
            display: none;
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .sticky-download-btn {
                bottom: 20px;
                right: 20px;
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            
            .modal-content {
                padding: 20px;
            }
        }
        
        @media (max-width: 640px) {
            .sticky-download-btn {
                bottom: 15px;
                right: 15px;
                padding: 10px 15px;
                font-size: 0.8rem;
            }