* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        :root {
            --primary: #4361ee;
            --secondary: #3f37c9;
            --accent: #4cc9f0;
            --light: #f8f9fa;
            --dark: #212529;
            --success: #4ade80;
            --warning: #facc15;
            --gray: #6c757d;
            --light-gray: #e9ecef;
        }
        
        body {
            color: var(--dark);
            line-height: 1.6;
            background-color: #fafafa;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .logo img {
            height: 40px;
            width: auto;
        }
        
        .logo h1 {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        
        nav a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            font-size: 16px;
            transition: color 0.3s;
            position: relative;
        }
        
        nav a:hover {
            color: var(--primary);
        }
        
        nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: width 0.3s;
        }
        
        nav a:hover::after {
            width: 100%;
        }
        
        /* 产品宣传部分 */
        .hero {
            padding: 80px 0;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
        }
        
        .hero-container {
            display: flex;
            align-items: center;
            gap: 60px;
        }
        
        .hero-content {
            flex: 1;
        }
        
        .hero-content h2 {
            font-size: 48px;
            line-height: 1.2;
            margin-bottom: 20px;
            color: var(--dark);
        }
        
        .hero-content p {
            font-size: 18px;
            color: var(--gray);
            margin-bottom: 30px;
        }
        
        .hero-buttons {
            display: flex;
            gap: 15px;
            margin-bottom: 30px;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 16px;
            text-decoration: none;
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .btn-primary {
            background-color: var(--primary);
            color: white;
            box-shadow: 0 4px 14px rgba(67, 97, 238, 0.4);
        }
        
        .btn-primary:hover {
            background-color: var(--secondary);
            transform: translateY(-3px);
        }
        
        .btn-secondary {
            background-color: white;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        
        .btn-secondary:hover {
            background-color: var(--light);
            transform: translateY(-3px);
        }
        
        .refund-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: rgba(76, 201, 240, 0.2);
            color: var(--primary);
            padding: 8px 15px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 500;
        }
        
        .refund-badge i {
            color: var(--success);
        }
        
        .rating {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 30px;
        }
        
        .stars {
            color: var(--warning);
        }
        
        .rating-text {
            font-weight: 500;
        }
        
        .hero-image {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .hero-image img {
            max-width: 100%;
            border-radius: 12px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }
        
        /* 产品展示部分 */
        .products {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            font-size: 36px;
            margin-bottom: 60px;
            color: var(--dark);
            position: relative;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px;
        }
        
        .product-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }
        
        .product-card {
            background: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: transform 0.3s;
        }
        
        .product-card:hover {
            transform: translateY(-10px);
        }
        
        .product-image {
            height: 200px;
            overflow: hidden;
        }
        
        .product-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .product-card:hover .product-image img {
            transform: scale(1.05);
        }
        
        .product-content {
            padding: 25px;
        }
        
        .product-content h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        .product-content p {
            color: var(--gray);
            margin-bottom: 20px;
        }
        
        .btn-download {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 6px;
            font-weight: 500;
            cursor: pointer;
            transition: background-color 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .btn-download:hover {
            background-color: var(--secondary);
        }
        
        /* 软件介绍部分 */
        .intro {
            padding: 80px 0;
            background-color: var(--light);
        }
        
        .intro-title {
            font-size: 36px;
            margin-bottom: 40px;
            color: var(--dark);
        }
        
        .intro-content {
            max-width: 800px;
            margin: 0 auto;
            font-size: 18px;
            line-height: 1.8;
            color: var(--gray);
        }
        
        .intro-content p {
            margin-bottom: 25px;
            text-align: justify;
        }
        
        /* 产品功能部分 */
        .feature {
            padding: 80px 0;
            background: linear-gradient(to bottom, #ffffff, #f0f5ff);
        }
        
        .feature-container {
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .feature-title {
            font-size: 36px;
            margin-bottom: 40px;
            color: var(--dark);
            text-align: center;
        }
        
        .feature-image {
            width: 100%;
            max-width: 900px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 25px 50px rgba(0,0,0,0.15);
        }
        
        .feature-image img {
            width: 100%;
            display: block;
        }
        
        /* 用户反馈部分 */
        .testimonials {
            padding: 80px 0;
            background-color: white;
        }
        
        .testimonials-title {
            font-size: 36px;
            margin-bottom: 60px;
            text-align: center;
            color: var(--dark);
        }
        
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .testimonial-card {
            background: white;
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            border: 1px solid var(--light-gray);
        }
        
        .testimonial-header {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 20px;
        }
        
        .user-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(45deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 24px;
            font-weight: bold;
        }
        
        .user-info h4 {
            font-size: 18px;
            margin-bottom: 5px;
        }
        
        .user-info p {
            color: var(--gray);
            font-size: 14px;
        }
        
        .testimonial-content {
            color: var(--gray);
            font-style: italic;
            line-height: 1.7;
        }
        
        .testimonial-rating {
            color: var(--warning);
            margin-top: 15px;
            font-size: 14px;
        }
        
        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: white;
            padding: 40px 0 20px;
        }
        
        .footer-container {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 40px;
        }
        
        .footer-logo {
            flex: 1;
            min-width: 250px;
        }
        
        .footer-logo h3 {
            font-size: 24px;
            margin-bottom: 15px;
            color: white;
        }
        
        .footer-logo p {
            color: #adb5bd;
            max-width: 300px;
            line-height: 1.7;
        }
        
        .footer-links {
            display: flex;
            gap: 60px;
        }
        
        .footer-links h4 {
            font-size: 18px;
            margin-bottom: 20px;
            color: white;
        }
        
        .footer-links ul {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            text-decoration: none;
            color: #adb5bd;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 40px;
            color: #6c757d;
            font-size: 14px;
            border-top: 1px solid #343a40;
            margin-top: 40px;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero-container {
                flex-direction: column;
                text-align: center;
            }
            
            .hero-buttons {
                justify-content: center;
            }
            
            .rating {
                justify-content: center;
            }
            
            .product-grid {
                grid-template-columns: 1fr;
            }
            
            .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        
        @media (max-width: 768px) {
            nav ul {
                gap: 15px;
            }
            
            .hero-content h2 {
                font-size: 36px;
            }
            
            .testimonial-grid {
                grid-template-columns: 1fr;
            }
            
            .footer-container {
                flex-direction: column;
            }
            
            .footer-links {
                width: 100%;
                justify-content: space-between;
            }
        }
        
        @media (max-width: 576px) {
            .header-container {
                flex-direction: column;
                gap: 15px;
            }
            
            nav ul {
                flex-wrap: wrap;
                justify-content: center;
            }
            
            .hero-buttons {
                flex-direction: column;
            }
            
            .footer-links {
                flex-direction: column;
                gap: 30px;
            }
        }