:root {
            --primary-color: #FF0000;
            --primary-dark: #CC0000;
            --primary-light: #FFCCCC;
            --secondary-color: #0066CC;
            --secondary-dark: #0052A3;
            --secondary-light: #CCE0FF;
            --accent-color: #FFCC00;
            --text-primary: #333333;
            --text-secondary: #666666;
            --background-light: #F5F5F5;
            --background-white: #FFFFFF;
            --card-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition-speed: 0.3s;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: var(--text-primary);
            background-color: var(--background-light);
            line-height: 1.6;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: white;
            transition: background-color var(--transition-speed);
        }
        
        .btn-primary:hover {
            background-color: var(--primary-dark);
        }
        
        .btn-secondary {
            background-color: var(--secondary-color);
            color: white;
            transition: background-color var(--transition-speed);
        }
        
        .btn-secondary:hover {
            background-color: var(--secondary-dark);
        }
        
        .btn-accent {
            background-color: var(--accent-color);
            color: var(--text-primary);
            transition: background-color var(--transition-speed);
        }
        
        .btn-accent:hover {
            background-color: #FFB300;
        }
        
        .card {
            background-color: var(--background-white);
            border-radius: 8px;
            box-shadow: var(--card-shadow);
            transition: transform var(--transition-speed), box-shadow var(--transition-speed);
        }
        
        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
        }
        
        .section-title {
            position: relative;
            display: inline-block;
            margin-bottom: 1.5rem;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        
        .sticky-download-btn {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1000;
            background-color: var(--accent-color);
            color: var(--text-primary);
            border-radius: 50px;
            padding: 15px 25px;
            font-weight: bold;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
            transition: all var(--transition-speed);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .sticky-download-btn:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.3);
        }
        
        @media (max-width: 768px) {
            .sticky-download-btn {
                bottom: 20px;
                right: 20px;
                padding: 12px 20px;
            }
        }
        
        .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;
        }
        
        .modal-content {
            background-color: var(--background-white);
            margin: 15% auto;
            padding: 30px;
            border-radius: 10px;
            width: 80%;
            max-width: 500px;
            text-align: center;
            animation: slideIn 0.3s;
        }
        
        @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(--secondary-color);
            margin-bottom: 1rem;
        }
        
        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2rem 0;
        }
        
        .comparison-table th, .comparison-table td {
            padding: 12px 15px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        
        .comparison-table th {
            background-color: var(--secondary-light);
            font-weight: bold;
        }
        
        .comparison-table tr:hover {
            background-color: #f5f5f5;
        }
        
        .checkmark {
            color: #4CAF50;
            font-weight: bold;
        }
        
        .x-mark {
            color: #F44336;
        }
        
        .faq-item {
            margin-bottom: 1rem;
            border-bottom: 1px solid #eee;
        }
        
        .faq-question {
            cursor: pointer;
            padding: 15px 0;
            font-weight: bold;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: color var(--transition-speed);
        }
        
        .faq-question:hover {
            color: var(--secondary-color);
        }
        
        .faq-answer {
            padding: 0 0 15px 0;
            display: none;
            color: var(--text-secondary);
        }
        
        .review-card {
            padding: 20px;
            margin-bottom: 20px;
            border-radius: 8px;
            background-color: var(--background-white);
            box-shadow: var(--card-shadow);
        }
        
        .review-rating {
            color: var(--accent-color);
            margin-bottom: 10px;
        }
        
        .download-option {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 15px;
            margin-bottom: 15px;
            border-radius: 8px;
            background-color: var(--background-white);
            box-shadow: var(--card-shadow);
            transition: transform var(--transition-speed);
        }
        
        .download-option:hover {
            transform: translateY(-3px);
        }
        
        .download-option-main {
            border-left: 5px solid var(--secondary-color);
        }
        
        .download-option-secondary {
            border-left: 5px solid #9E9E9E;
            opacity: 0.8;
        }
        
        .download-option-secondary:hover {
            opacity: 1;
        }
        
        .qr-code {
            max-width: 150px;
            margin: 0 auto;
        }
        
        /* 响应式调整 */
        @media (max-width: 768px) {
            .download-option {
                flex-direction: column;
                text-align: center;
            }
            
            .download-option div {
                margin-bottom: 15px;
            }
        }
        
        /* 自定义滚动条 */
        ::-webkit-scrollbar {
            width: 8px;
        }
        
        ::-webkit-scrollbar-track {
            background: #f1f1f1;
        }
        
        ::-webkit-scrollbar-thumb {
            background: var(--secondary-color);
            border-radius: 4px;
        }
        
        ::-webkit-scrollbar-thumb:hover {
            background: var(--secondary-dark);
        }
        
        /* 特色功能卡片 */
        .feature-card {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: transform var(--transition-speed);
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
        }
        
        .feature-card-header {
            background-color: var(--secondary-color);
            color: white;
            padding: 15px;
            font-weight: bold;
            font-size: 1.2rem;
        }
        
        .feature-card-body {
            padding: 20px;
            background-color: white;
        }
        
        /* 步骤卡片 */
        .step-card {
            display: flex;
            margin-bottom: 30px;
            align-items: flex-start;
        }
        
        .step-number {
            background-color: var(--primary-color);
            color: white;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
            margin-right: 20px;
            flex-shrink: 0;
        }
        
        .step-content {
            flex-grow: 1;
        }
        
        /* 标签样式 */
        .tag {
            display: inline-block;
            padding: 3px 10px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: bold;
            margin-right: 5px;
            margin-bottom: 5px;
        }
        
        .tag-primary {
            background-color: var(--primary-light);
            color: var(--primary-dark);
        }
        
        .tag-secondary {
            background-color: var(--secondary-light);
            color: var(--secondary-dark);
        }
        
        /* 图片比较效果 */
        .image-comparison {
            position: relative;
            width: 100%;
            height: 300px;
            overflow: hidden;
            border-radius: 8px;
            box-shadow: var(--card-shadow);
        }
        
        .image-comparison img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .image-comparison .before {
            z-index: 1;
            clip-path: polygon(0 0, 50% 0, 50% 100%, 0 100%);
        }
        
        .image-comparison .after {
            z-index: 0;
        }
        
        .image-comparison .slider {
            position: absolute;
            top: 0;
            bottom: 0;
            left: 50%;
            width: 4px;
            background-color: white;
            z-index: 2;
            cursor: ew-resize;
        }
        
        .image-comparison .slider::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 40px;
            height: 40px;
            background-color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
        }
        
        .image-comparison .slider::before {
            content: '⟷';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: var(--secondary-color);
            font-size: 1.5rem;
            font-weight: bold;
            z-index: 3;
        }