:root {
            --primary-color: #1c6ef2;
            --primary-dark: #1557c0;
            --secondary-color: #6c63ff;
            --gradient-primary: linear-gradient(135deg, #1c6ef2 0%, #6c63ff 100%);
            --gradient-light: linear-gradient(135deg, #4d8df8 0%, #847cff 100%);
            --text-dark: #333;
            --text-light: #666;
            --text-lighter: #888;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.05);
            --border-radius: 12px;
            --border-radius-lg: 20px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航栏样式 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-light);
            z-index: 1000;
            transition: all 0.3s ease;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .logo-img {
            width: 40px;
            height: 40px;
            border-radius: 8px;
            object-fit: cover;
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        
        nav a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 500;
            transition: color 0.2s;
            position: relative;
        }
        
        nav a:hover {
            color: var(--primary-color);
        }
        
        nav a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--gradient-primary);
            bottom: -5px;
            left: 0;
            transition: width 0.3s;
        }
        
        nav a:hover::after {
            width: 100%;
        }
        
        .mobile-menu-btn {
            display: none; /* 默认隐藏，在移动端显示 */
            font-size: 24px;
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-dark);
        }
        
        /* 移动端菜单 - 默认隐藏，只在移动端显示 */
        .mobile-menu {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background: white;
            padding: 20px;
            box-shadow: var(--shadow);
            display: none;
            flex-direction: column;
            gap: 15px;
            z-index: 999;
        }
        
        .mobile-menu.active {
            display: flex;
        }
        
        /* 英雄区样式 */
        .hero {
            padding: 160px 0 100px;
            background: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);
            overflow: hidden;
        }
        
        .hero-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
        }
        
        .hero-content {
            flex: 1;
        }
        
        .hero h1 {
            font-size: 48px;
            line-height: 1.2;
            margin-bottom: 20px;
            background: var(--gradient-primary);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        
        .hero p {
            font-size: 18px;
            color: var(--text-light);
            margin-bottom: 30px;
            max-width: 600px;
        }
        
        .btn {
            display: inline-block;
            padding: 14px 32px;
            background: var(--gradient-primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            text-decoration: none;
            transition: all 0.3s;
            box-shadow: 0 8px 20px rgba(28, 110, 242, 0.3);
        }
        
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 25px rgba(28, 110, 242, 0.4);
        }
        
        .btn-secondary {
            background: var(--gradient-light);
            margin-left: 15px;
        }
        
        .hero-image {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        
        .hero-image img {
            max-width: 100%;
            border-radius: var(--border-radius-lg);
            box-shadow: var(--shadow);
            transform: perspective(1000px) rotateY(-10deg);
            transition: transform 0.5s;
        }
        
        .hero-image img:hover {
            transform: perspective(1000px) rotateY(0deg);
        }
        
        /* 下载区域样式 - 修改：二维码在前，下载选项在后 */
        .download-section {
            padding: 100px 0;
            background-color: var(--bg-white);
        }
        
        .download-container {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: 60px;
        }
        
        .download-qr {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            background: var(--bg-light);
            padding: 40px;
            border-radius: var(--border-radius-lg);
            box-shadow: var(--shadow-light);
        }
        
        .qr-title {
            font-size: 24px;
            margin-bottom: 20px;
            color: var(--text-dark);
            text-align: center;
        }
        
        .qr-code {
            width: 220px;
            height: 220px;
            border-radius: var(--border-radius);
            margin-bottom: 25px;
            box-shadow: var(--shadow);
        }
        
        .qr-note {
            color: var(--text-light);
            text-align: center;
            font-size: 14px;
            max-width: 300px;
        }
        
        .download-content {
            flex: 1;
        }
        
        .download-content h2 {
            font-size: 36px;
            margin-bottom: 20px;
            color: var(--text-dark);
        }
        
        .download-content p {
            font-size: 18px;
            color: var(--text-light);
            margin-bottom: 30px;
        }
        
        .download-options {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 30px;
        }
        
        .download-option {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 20px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-light);
            transition: transform 0.3s, box-shadow 0.3s;
            border-left: 4px solid var(--primary-color);
        }
        
        .download-option:hover {
            transform: translateX(10px);
            box-shadow: var(--shadow);
        }
        
        .download-buttons {
            margin-top: 40px;
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        /* 功能区样式 */
        .section-title {
            text-align: center;
            font-size: 36px;
            margin-bottom: 60px;
            color: var(--text-dark);
            position: relative;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            width: 60px;
            height: 4px;
            background: var(--gradient-primary);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        
        .features {
            padding: 100px 0;
            background-color: var(--bg-light);
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }
        
        .feature-card {
            background: var(--bg-white);
            border-radius: var(--border-radius);
            padding: 30px;
            box-shadow: var(--shadow-light);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow);
        }
        
        .feature-icon {
            width: 60px;
            height: 60px;
            border-radius: 12px;
            background: var(--gradient-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        
        .feature-icon i {
            font-size: 28px;
            color: white;
        }
        
        .feature-card h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--text-dark);
        }
        
        .feature-card p {
            color: var(--text-light);
        }
        
        /* 弹出二维码模态框 */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            z-index: 2000;
            justify-content: center;
            align-items: center;
        }
        
        .modal-content {
            background: white;
            padding: 40px;
            border-radius: var(--border-radius-lg);
            text-align: center;
            max-width: 400px;
            width: 90%;
        }
        
        .modal-qr {
            width: 220px;
            height: 220px;
            margin: 20px auto;
        }
        
        .close-modal {
            position: absolute;
            top: 15px;
            right: 15px;
            font-size: 30px;
            cursor: pointer;
            color: var(--text-light);
        }
        
        /* 跟随下载按钮 */
        .floating-download-btn {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 999;
            background: var(--gradient-primary);
            color: white;
            padding: 15px 25px;
            border-radius: 50px;
            box-shadow: 0 10px 25px rgba(28, 110, 242, 0.4);
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: none;
            align-items: center;
            gap: 10px;
        }
        
        .floating-download-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(28, 110, 242, 0.5);
        }
        
        /* 教程和FAQ部分 */
        .tutorial-section, .faq-section {
            padding: 100px 0;
        }
        
        .faq-section {
            background-color: var(--bg-light);
        }
        
        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .tutorial-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-light);
        }
        
        .tutorial-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        
        .tutorial-content {
            padding: 25px;
        }
        
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            margin-bottom: 15px;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--shadow-light);
        }
        
        .faq-question {
            background: white;
            padding: 20px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-answer {
            background: #f9f9f9;
            padding: 0;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s, padding 0.3s;
        }
        
        .faq-answer.open {
            padding: 20px;
            max-height: 500px;
        }
        
        /* 页脚 */
        footer {
            background: #1a1a2e;
            color: white;
            padding: 60px 0 30px;
        }
        
        .footer-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
        }
        
        .footer-column {
            flex: 1;
            min-width: 200px;
        }
        
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
        }
        
        .footer-logo img {
            width: 40px;
            height: 40px;
            border-radius: 8px;
        }
        
        .footer-column h3 {
            font-size: 18px;
            margin-bottom: 20px;
            color: #fff;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #aaa;
            text-decoration: none;
            transition: color 0.2s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            margin-top: 50px;
            padding-top: 20px;
            border-top: 1px solid #333;
            color: #aaa;
            font-size: 14px;
        }
        
        /* 响应式设计 - 移动端样式 */
        @media (max-width: 768px) {
            /* 在移动端显示汉堡菜单按钮 */
            .mobile-menu-btn {
                display: block;
            }
            
            /* 在移动端隐藏常规导航 */
            nav ul {
                display: none;
            }
            
            .hero-container, .download-container {
                flex-direction: column;
                text-align: center;
            }
            
            .hero h1 {
                font-size: 32px;
            }
            
            .hero-image img {
                transform: none;
            }
            
            .download-qr {
                order: 1;
                width: 100%;
            }
            
            .download-content {
                order: 2;
                width: 100%;
            }
            
            .download-option:hover {
                transform: translateY(-5px);
            }
            
            .section-title {
                font-size: 30px;
            }
            
            .btn-secondary {
                margin-left: 0;
                margin-top: 15px;
            }
            
            .floating-download-btn {
                bottom: 20px;
                right: 20px;
                padding: 12px 20px;
                font-size: 14px;
            }
        }
        
        @media (max-width: 992px) {
            .hero-container, .download-container {
                flex-direction: column;
                text-align: center;
            }
            
            .hero h1 {
                font-size: 40px;
            }
            
            .hero-image img {
                transform: none;
            }
            
            .download-qr {
                order: 1;
                width: 100%;
            }
            
            .download-content {
                order: 2;
                width: 100%;
            }
            
            .download-option:hover {
                transform: translateY(-5px);
            }
        }
        
        @media (max-width: 480px) {
            .hero {
                padding: 140px 0 80px;
            }
            
            .features, .download-section, .tutorial-section, .faq-section {
                padding: 70px 0;
            }
            
            .hero h1 {
                font-size: 28px;
            }
            
            .section-title {
                font-size: 26px;
            }
            
            .qr-code {
                width: 180px;
                height: 180px;
            }
        }