* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(135deg, #4CAF50 0%, #2E7D32 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 1.8rem;
            font-weight: 700;
        }
        
        .logo-icon {
            font-size: 2.2rem;
            margin-right: 10px;
        }
        
        .brand-name {
            color: #FFEB3B;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 1.8rem;
        }
        
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            transition: opacity 0.3s;
        }
        
        nav a:hover {
            opacity: 0.9;
            text-decoration: underline;
        }
        
        /* 移动端导航按钮 */
        .mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        /* 主要内容区 */
        .hero {
            padding: 4rem 0;
            text-align: center;
            background-color: white;
        }
        
        h1 {
            font-size: 2.8rem;
            margin-bottom: 1.2rem;
            color: #2c3e50;
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            color: #555;
        }
        
        .highlight {
            color: #4CAF50;
            font-weight: 700;
        }
        
        .cta-button {
            display: inline-block;
            background: linear-gradient(to right, #4CAF50, #2E7D32);
            color: white;
            padding: 1rem 2.5rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .cta-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
        }
        
        /* 功能特点 */
        .features {
            padding: 4rem 0;
            background-color: #f0f9f1;
        }
        
        .section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 3rem;
            color: #2c3e50;
        }
        
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .feature-card {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: #4CAF50;
            margin-bottom: 1.2rem;
        }
        
        .feature-card h3 {
            font-size: 1.4rem;
            margin-bottom: 1rem;
            color: #2c3e50;
        }
        
        /* 二维码区域 */
        .qr-section {
            padding: 4rem 0;
            background-color: white;
        }
        
        .qr-container {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .qr-section-title {
            text-align: center;
            font-size: 2.2rem;
            margin-bottom: 3rem;
            color: #2c3e50;
        }
        
        .qr-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
        }
        
        .qr-card {
            background: #f9f9f9;
            border-radius: 12px;
            padding: 2.5rem;
            text-align: left;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s;
        }
        
        .qr-card:hover {
            transform: translateY(-8px);
        }
        
        .qr-card.english {
            border-top: 5px solid #2196F3;
        }
        
        .qr-card.chinese {
            border-top: 5px solid #FF9800;
        }
        
        .qr-title {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: #2c3e50;
        }
        
        .qr-title.english {
            color: #2196F3;
        }
        
        .qr-title.chinese {
            color: #FF9800;
        }
        
        .qr-code {
            width: 200px;
            height: 200px;
            background: #eee;
            margin: 0 auto 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            font-size: 0.9rem;
            color: #666;
        }
        
        .qr-desc {
            color: #666;
            margin-bottom: 1.5rem;
        }
        
        .qr-button {
            display: inline-block;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 600;
            transition: background-color 0.3s;
        }
        
        .qr-button.english {
            background-color: #2196F3;
            color: white;
        }
        
        .qr-button.chinese {
            background-color: #FF9800;
            color: white;
        }
        
        .qr-button:hover {
            opacity: 0.9;
        }
        
        /* 使用场景 */
        .use-cases {
            padding: 4rem 0;
            background-color: #f0f9f1;
        }
        
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        
        .case-item {
            background: white;
            border-radius: 10px;
            padding: 1.8rem;
            text-align: center;
        }
        
        .case-icon {
            font-size: 2.2rem;
            color: #4CAF50;
            margin-bottom: 1rem;
        }
        
        /* 页脚 */
        footer {
            background-color: #2c3e50;
            color: white;
            padding: 3rem 0 1.5rem;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        
        .footer-section h3 {
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            color: #FFEB3B;
        }
        
        .footer-section ul {
            list-style: none;
        }
        
        .footer-section li {
            margin-bottom: 0.8rem;
        }
        
        .footer-section a {
            color: #ddd;
            text-decoration: none;
        }
        
        .footer-section a:hover {
            color: #4CAF50;
        }
        
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            color: #aaa;
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .header-container {
                flex-direction: column;
                text-align: center;
            }
            
            .logo {
                margin-bottom: 1rem;
            }
            
            nav ul {
                flex-direction: column;
                width: 100%;
            }
            
            nav li {
                margin: 0.5rem 0;
            }
            
            h1 {
                font-size: 2.2rem;
            }
            
            .qr-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            
            .hero p {
                font-size: 1.1rem;
                padding: 0 15px;
            }
            
            .mobile-nav-toggle {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            
            .nav-menu {
                display: none;
                width: 100%;
            }
            
            .nav-menu.active {
                display: block;
            }
        }
        
        @media (max-width: 480px) {
            h1 {
                font-size: 1.8rem;
            }
            
            .section-title {
                font-size: 1.8rem;
            }
            
            .qr-section-title {
                font-size: 1.8rem;
            }
            
            .feature-card, .qr-card {
                padding: 1.5rem;
            }
        }