:root {
            --primary-blue: #1a73e8;
            --dark-blue: #0d47a1;
            --light-blue: #e8f0fe;
            --accent-green: #34a853;
            --accent-orange: #ff9800;
            --text-dark: #202124;
            --text-gray: #5f6368;
            --light-gray: #f8f9fa;
            --border-gray: #dadce0;
            --white: #ffffff;
            --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Noto Sans SC', sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background-color: var(--white);
        }
        
        a {
            text-decoration: none;
            color: inherit;
        }
        
        ul {
            list-style: none;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航栏 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: var(--shadow);
            z-index: 1000;
            padding: 15px 0;
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-blue);
        }
        
        .logo i {
            margin-right: 10px;
            font-size: 2rem;
        }
        
        .nav-links {
            display: flex;
            gap: 30px;
        }
        
        .nav-links a {
            font-weight: 500;
            font-size: 1.1rem;
            transition: var(--transition);
            position: relative;
        }
        
        .nav-links a:hover {
            color: var(--primary-blue);
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary-blue);
            transition: var(--transition);
        }
        
        .nav-links a:hover::after {
            width: 100%;
        }
        
        .nav-buttons {
            display: flex;
            gap: 15px;
        }
        
        .btn {
            display: inline-block;
            padding: 10px 24px;
            border-radius: 6px;
            font-weight: 500;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            border: none;
        }
        
        .btn-login {
            background-color: transparent;
            color: var(--primary-blue);
            border: 1px solid var(--primary-blue);
        }
        
        .btn-login:hover {
            background-color: var(--light-blue);
        }
        
        .btn-primary {
            background-color: var(--primary-blue);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: var(--dark-blue);
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(26, 115, 232, 0.3);
        }
        
        .btn-accent {
            background-color: var(--accent-green);
            color: white;
        }
        
        .btn-accent:hover {
            background-color: #2e8b47;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(52, 168, 83, 0.3);
        }
        
        .btn-outline {
            background-color: transparent;
            color: var(--primary-blue);
            border: 1px solid var(--primary-blue);
        }
        
        .btn-outline:hover {
            background-color: var(--light-blue);
        }
        
        .mobile-toggle {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 首屏区域 */
        .hero {
            padding: 160px 0 100px;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            overflow: hidden;
        }
        
        .hero-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .hero-text {
            flex: 1;
            max-width: 600px;
        }
        
        .hero-text h1 {
            font-size: 3.2rem;
            line-height: 1.2;
            margin-bottom: 20px;
            color: var(--text-dark);
        }
        
        .hero-text p {
            font-size: 1.3rem;
            color: var(--text-gray);
            margin-bottom: 30px;
        }
        
        .hero-buttons {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            margin-bottom: 30px;
        }
        
        .device-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        
        .device-btn {
            display: flex;
            align-items: center;
            padding: 10px 15px;
            background-color: white;
            border-radius: 6px;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .device-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .device-btn i {
            margin-right: 8px;
            color: var(--primary-blue);
        }
        
        .hero-visual {
            flex: 1;
            position: relative;
            max-width: 500px;
        }
        
        .app-mockup {
            width: 100%;
            border-radius: 20px;
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
            transform: perspective(1000px) rotateY(-10deg);
            transition: var(--transition);
        }
        
        .app-mockup:hover {
            transform: perspective(1000px) rotateY(0);
        }
        
        .connection-animation {
            position: absolute;
            top: 50px;
            right: 50px;
            width: 60px;
            height: 60px;
            background-color: var(--accent-green);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            animation: pulse 2s infinite;
            box-shadow: 0 0 0 rgba(52, 168, 83, 0.7);
        }
        
        @keyframes pulse {
            0% {
                box-shadow: 0 0 0 0 rgba(52, 168, 83, 0.7);
            }
            70% {
                box-shadow: 0 0 0 15px rgba(52, 168, 83, 0);
            }
            100% {
                box-shadow: 0 0 0 0 rgba(52, 168, 83, 0);
            }
        }
        
        /* 功能优势区 */
        .features {
            padding: 100px 0;
            background-color: var(--white);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--text-dark);
            margin-bottom: 15px;
        }
        
        .section-title p {
            font-size: 1.2rem;
            color: var(--text-gray);
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        
        .feature-card {
            padding: 30px;
            border-radius: 12px;
            background-color: var(--light-gray);
            transition: var(--transition);
            text-align: center;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow);
        }
        
        .feature-icon {
            width: 70px;
            height: 70px;
            margin: 0 auto 20px;
            background-color: var(--light-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--primary-blue);
        }
        
        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: var(--text-dark);
        }
        
        .feature-card p {
            color: var(--text-gray);
        }
        
        /* 技术信任区 */
        .trust {
            padding: 100px 0;
            background-color: var(--light-gray);
        }
        
        .trust-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 40px;
        }
        
        .trust-text {
            flex: 1;
            min-width: 300px;
        }
        
        .trust-text h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--text-dark);
        }
        
        .trust-items {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            margin-top: 40px;
        }
        
        .trust-item {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .trust-icon {
            width: 50px;
            height: 50px;
            background-color: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
        }
        
        .trust-visual {
            flex: 1;
            min-width: 300px;
            text-align: center;
        }
        
        .trust-badge {
            display: inline-block;
            padding: 40px;
            background-color: white;
            border-radius: 20px;
            box-shadow: var(--shadow);
        }
        
        .trust-badge i {
            font-size: 5rem;
            color: var(--accent-green);
            margin-bottom: 20px;
        }
        
        .trust-badge h3 {
            font-size: 1.5rem;
            color: var(--text-dark);
        }
        
        /* 用户评价区 */
        .testimonials {
            padding: 100px 0;
            background-color: var(--white);
        }
        
        .testimonial-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-bottom: 50px;
        }
        
        .testimonial-card {
            padding: 30px;
            border-radius: 12px;
            background-color: var(--light-gray);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .testimonial-card:hover {
            transform: translateY(-5px);
        }
        
        .testimonial-header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
        }
        
        .user-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background-color: var(--primary-blue);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-right: 15px;
        }
        
        .user-info h4 {
            font-size: 1.3rem;
            margin-bottom: 5px;
        }
        
        .stars {
            color: var(--accent-orange);
        }
        
        .testimonial-body p {
            font-style: italic;
            color: var(--text-gray);
        }
        
        .stats {
            display: flex;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 30px;
            text-align: center;
            padding: 40px;
            background-color: var(--light-blue);
            border-radius: 15px;
        }
        
        .stat-item h3 {
            font-size: 2.5rem;
            color: var(--primary-blue);
            margin-bottom: 10px;
        }
        
        /* 定价引导区 */
        .pricing {
            padding: 100px 0;
            background-color: var(--light-gray);
        }
        
        .pricing-cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .pricing-card {
            background-color: var(--white);
            border-radius: 15px;
            padding: 40px 30px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            text-align: center;
            position: relative;
        }
        
        .pricing-card:hover {
            transform: translateY(-10px);
        }
        
        .pricing-card.popular {
            border: 2px solid var(--primary-blue);
        }
        
        .popular-badge {
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            background-color: var(--accent-green);
            color: white;
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: 500;
        }
        
        .pricing-card h3 {
            font-size: 1.8rem;
            margin-bottom: 20px;
            color: var(--text-dark);
        }
        
        .price {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 10px;
        }
        
        .price span {
            font-size: 1rem;
            color: var(--text-gray);
        }
        
        .pricing-features {
            margin: 30px 0;
            text-align: left;
        }
        
        .pricing-features li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-gray);
            display: flex;
            align-items: center;
        }
        
        .pricing-features li i {
            color: var(--accent-green);
            margin-right: 10px;
        }
        
        /* 常见问题区 */
        .faq {
            padding: 100px 0;
            background-color: var(--white);
        }
        
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            margin-bottom: 20px;
            border: 1px solid var(--border-gray);
            border-radius: 10px;
            overflow: hidden;
        }
        
        .faq-question {
            padding: 20px;
            background-color: var(--light-gray);
            font-weight: 500;
            font-size: 1.2rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-answer {
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        
        .faq-answer.active {
            padding: 20px;
            max-height: 500px;
        }
        
        /* 页脚 */
        footer {
            background-color: var(--text-dark);
            color: white;
            padding: 70px 0 30px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 50px;
        }
        
        .footer-column h3 {
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background-color: var(--primary-blue);
        }
        
        .footer-links li {
            margin-bottom: 15px;
        }
        
        .footer-links a {
            color: #bdc1c6;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--primary-blue);
            padding-left: 5px;
        }
        
        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }
        
        .social-icons a {
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        
        .social-icons a:hover {
            background-color: var(--primary-blue);
            transform: translateY(-5px);
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #bdc1c6;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero-content {
                flex-direction: column;
                text-align: center;
            }
            
            .hero-text {
                margin-bottom: 50px;
            }
            
            .hero-visual {
                max-width: 80%;
            }
            
            .trust-content {
                flex-direction: column;
                text-align: center;
            }
        }
        
        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            
            .nav-links, .nav-buttons {
                display: none;
            }
            
            .nav-links.active {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: white;
                padding: 20px;
                box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
                z-index: 1000;
            }
            
            .nav-buttons.active {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: white;
                padding: 20px;
                box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
                z-index: 1000;
                margin-top: 180px;
            }
            
            .hero-text h1 {
                font-size: 2.5rem;
            }
            
            .hero-buttons {
                justify-content: center;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
        }
        
        @media (max-width: 480px) {
            .hero-text h1 {
                font-size: 2rem;
            }
            
            .hero-text p {
                font-size: 1.1rem;
            }
            
            .btn {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
        }
        
        /* 问题解答区 */
        .qna {
            padding: 80px 0;
            background-color: var(--light-gray);
        }
        
        .qna-container {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .qna-item {
            background-color: white;
            border-radius: 10px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: var(--shadow);
        }
        
        .qna-question {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--primary-blue);
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-gray);
        }
        
        .qna-answer {
            color: var(--text-gray);
        }
        
        .qna-answer ol {
            padding-left: 20px;
            margin-top: 15px;
        }
        
        .qna-answer li {
            margin-bottom: 15px;
            padding-left: 10px;
        }