:root {
            --primary: #3498db;
            --secondary: #2c3e50;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #34495e;
            --success: #2ecc71;
            --warning: #f39c12;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f8f9fa;
            color: #333;
            line-height: 1.6;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, var(--secondary), var(--dark));
            color: white;
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: var(--shadow);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: bold;
        }
        
        .logo i {
            color: var(--primary);
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 5px 10px;
            border-radius: 4px;
            transition: var(--transition);
        }
        
        nav a:hover, nav a.active {
            background-color: rgba(255, 255, 255, 0.1);
        }
        
        /* 头部模块 */
        .hero {
            background: linear-gradient(rgba(44, 62, 80, 0.9), rgba(52, 73, 94, 0.9)), url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="%232c3e50"/><path d="M0 0L100 100M100 0L0 100" stroke="%2334495e" stroke-width="1"/></svg>');
            background-size: cover;
            color: white;
            padding: 80px 0;
            text-align: center;
        }
        
        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }
        
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            opacity: 0.9;
        }
        
        .value-prop {
            background-color: rgba(255, 255, 255, 0.1);
            display: inline-block;
            padding: 10px 20px;
            border-radius: 30px;
            margin-bottom: 30px;
            font-weight: 500;
        }
        
        .download-btn {
            display: inline-block;
            background-color: var(--accent);
            color: white;
            padding: 15px 40px;
            font-size: 1.2rem;
            font-weight: bold;
            text-decoration: none;
            border-radius: 50px;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(231, 76, 60, 0.4);
            margin: 10px;
        }
        
        .download-btn:hover {
            background-color: #c0392b;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(231, 76, 60, 0.6);
        }
        
        .download-btn i {
            margin-right: 8px;
        }
        
        /* 功能特性区 */
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--secondary);
            display: inline-block;
            padding-bottom: 15px;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
        }
        
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .feature-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
        }
        
        .feature-icon {
            background: var(--primary);
            color: white;
            font-size: 2.5rem;
            height: 100px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .feature-content {
            padding: 25px;
        }
        
        .feature-content h3 {
            margin-bottom: 15px;
            color: var(--secondary);
        }
        
        /* 技术验证区 */
        .tech-validation {
            background-color: var(--light);
        }
        
        .validation-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            text-align: center;
        }
        
        .validation-item {
            background: white;
            padding: 30px 20px;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        
        .validation-item i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 20px;
        }
        
        /* 应用场景区 */
        .scenarios {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .scenario-card {
            background: white;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        
        .scenario-header {
            background: var(--secondary);
            color: white;
            padding: 20px;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .scenario-header i {
            font-size: 2rem;
        }
        
        .scenario-content {
            padding: 25px;
        }
        
        .scenario-content ul {
            padding-left: 20px;
            margin-top: 15px;
        }
        
        .scenario-content li {
            margin-bottom: 8px;
        }
        
        /* 技术规格区 */
        .specs {
            background-color: var(--light);
        }
        
        .specs-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .spec-card {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        
        .spec-card h3 {
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary);
            color: var(--secondary);
        }
        
        .spec-list {
            list-style: none;
        }
        
        .spec-list li {
            padding: 10px 0;
            border-bottom: 1px dashed #eee;
            display: flex;
            justify-content: space-between;
        }
        
        .spec-list li:last-child {
            border-bottom: none;
        }
        
        /* 社会认同区 */
        .social-proof {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
        }
        
        .testimonials {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        
        .testimonial {
            margin-bottom: 25px;
            padding-bottom: 25px;
            border-bottom: 1px solid #eee;
        }
        
        .testimonial:last-child {
            margin-bottom: 0;
            padding-bottom: 0;
            border-bottom: none;
        }
        
        .testimonial-header {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 1.2rem;
            margin-right: 15px;
        }
        
        .user-info h4 {
            margin-bottom: 5px;
        }
        
        .user-info p {
            color: #777;
            font-size: 0.9rem;
        }
        
        .stats {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: var(--shadow);
            text-align: center;
        }
        
        .stat-item {
            margin-bottom: 25px;
        }
        
        .stat-item:last-child {
            margin-bottom: 0;
        }
        
        .stat-value {
            font-size: 2.5rem;
            font-weight: bold;
            color: var(--primary);
            margin-bottom: 5px;
        }
        
        .stat-label {
            color: #777;
        }
        
        /* 行动引导区 */
        .cta {
            background: linear-gradient(135deg, var(--primary), #2980b9);
            color: white;
            text-align: center;
            padding: 80px 0;
        }
        
        .cta h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
        }
        
        .cta p {
            max-width: 700px;
            margin: 0 auto 30px;
            font-size: 1.1rem;
            opacity: 0.9;
        }
        
        .download-options {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 40px;
        }
        
        .download-option {
            background: white;
            border-radius: 10px;
            padding: 30px;
            width: 280px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .download-option:hover {
            transform: translateY(-5px);
        }
        
        .download-option h3 {
            color: var(--secondary);
            margin-bottom: 20px;
        }
        
        .platform {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
        }
        
        .platform i {
            font-size: 1.5rem;
            color: var(--primary);
        }
        
        /* 常见问题 */
        .faq {
            background-color: var(--light);
        }
        
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            background: white;
            border-radius: 8px;
            margin-bottom: 20px;
            box-shadow: var(--shadow);
            overflow: hidden;
        }
        
        .faq-question {
            padding: 20px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: var(--transition);
        }
        
        .faq-item.active .faq-answer {
            padding: 0 20px 20px;
            max-height: 500px;
        }
        
        /* 页脚 */
        footer {
            background: var(--secondary);
            color: white;
            padding: 50px 0 20px;
        }
        
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }
        
        .footer-column h3 {
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--primary);
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--primary);
            padding-left: 5px;
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                gap: 15px;
            }
            
            nav ul {
                gap: 15px;
            }
            
            .hero h1 {
                font-size: 2.2rem;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .download-options {
                flex-direction: column;
                align-items: center;
            }
        }
        
        /* 固定下载按钮 */
        .sticky-download {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 99;
            display: none;
        }
        
        .sticky-download .download-btn {
            padding: 12px 25px;
            font-size: 1rem;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }