:root {
            --primary-blue: #1a6dfc;
            --dark-blue: #0a4cb9;
            --light-blue: #e8f1ff;
            --accent-blue: #4d8eff;
            --text-dark: #333;
            --text-light: #666;
            --bg-light: #f9fbfe;
            --white: #ffffff;
            --shadow: 0 5px 20px rgba(26, 111, 252, 0.1);
            --border-radius: 10px;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Noto Sans SC', 'Poppins', sans-serif;
            color: var(--text-dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        
        a {
            text-decoration: none;
            color: inherit;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 导航栏 */
        header {
            background-color: var(--white);
            box-shadow: var(--shadow);
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
        }
        
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
        }
        
        .logo {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary-blue);
            display: flex;
            align-items: center;
        }
        
        .logo i {
            margin-right: 10px;
            font-size: 32px;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 30px;
        }
        
        .nav-links a {
            font-weight: 500;
            font-size: 16px;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--primary-blue);
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--primary-blue);
            cursor: pointer;
        }
        
        /* 跟随下载按钮 */
        .floating-download-btn {
            position: fixed;
            right: 30px;
            top: 50%;
            transform: translateY(-50%);
            background: var(--primary-blue);
            color: white;
            padding: 15px 20px;
            border-radius: 50px;
            box-shadow: var(--shadow);
            z-index: 999;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            transition: all 0.3s;
            cursor: pointer;
            max-width: 60px;
            overflow: hidden;
        }
        
        .floating-download-btn:hover {
            max-width: 200px;
            background: var(--dark-blue);
        }
        
        .floating-download-btn i {
            font-size: 24px;
            margin-bottom: 5px;
        }
        
        .floating-download-btn span {
            white-space: nowrap;
            opacity: 0;
            transition: opacity 0.3s;
            font-weight: 500;
        }
        
        .floating-download-btn:hover span {
            opacity: 1;
        }
        
        /* 英雄区域 */
        .hero {
            background: linear-gradient(135deg, #f0f7ff 0%, #e8f1ff 100%);
            padding: 180px 0 100px;
            margin-top: 80px;
        }
        
        .hero-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .hero-text {
            flex: 1;
            padding-right: 40px;
        }
        
        .hero-image {
            flex: 1;
            display: flex;
            justify-content: flex-end;
        }
        
        .hero h1 {
            font-size: 48px;
            line-height: 1.2;
            margin-bottom: 20px;
            color: var(--text-dark);
        }
        
        .hero h1 span {
            color: var(--primary-blue);
        }
        
        .hero p {
            font-size: 18px;
            color: var(--text-light);
            margin-bottom: 30px;
            max-width: 500px;
        }
        
        .btn {
            display: inline-block;
            background-color: var(--primary-blue);
            color: white;
            padding: 15px 35px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 16px;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
        }
        
        .btn:hover {
            background-color: var(--dark-blue);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 111, 252, 0.2);
        }
        
        .btn i {
            margin-right: 8px;
        }
        
        .hero-image img {
            max-width: 100%;
            border-radius: 15px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            transform: perspective(1000px) rotateY(-10deg);
            transition: transform 0.5s;
        }
        
        .hero-image img:hover {
            transform: perspective(1000px) rotateY(0deg);
        }
        
        /* 功能区域 */
        .features {
            padding: 100px 0;
            background-color: var(--white);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title h2 {
            font-size: 36px;
            color: var(--text-dark);
            margin-bottom: 15px;
        }
        
        .section-title p {
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }
        
        .feature-card {
            background-color: var(--bg-light);
            border-radius: var(--border-radius);
            padding: 30px;
            text-align: center;
            transition: transform 0.3s, box-shadow 0.3s;
            border: 1px solid #e6f0ff;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow);
        }
        
        .feature-icon {
            width: 70px;
            height: 70px;
            background-color: var(--light-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            color: var(--primary-blue);
            font-size: 28px;
        }
        
        .feature-card h3 {
            font-size: 20px;
            margin-bottom: 15px;
            color: var(--text-dark);
        }
        
        .feature-card p {
            color: var(--text-light);
        }
        
        /* 下载区域 */
        .download {
            padding: 100px 0;
            background-color: var(--bg-light);
        }
        
        .download-options {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 40px;
        }
        
        .download-card {
            background-color: var(--white);
            border-radius: var(--border-radius);
            padding: 40px;
            text-align: center;
            flex: 1;
            min-width: 300px;
            max-width: 450px;
            box-shadow: var(--shadow);
        }
        
        .download-card h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: var(--text-dark);
        }
        
        .download-card h3 i {
            margin-right: 10px;
            color: var(--primary-blue);
        }
        
        .qrcode-container {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            display: inline-block;
            margin: 20px 0;
            border: 1px solid #eee;
        }
        
        .qrcode {
            width: 180px;
            height: 180px;
            background-color: #f5f5f5;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-light);
            margin: 0 auto;
        }
        
        .download-links {
            margin-top: 30px;
        }
        
        .download-link {
            display: block;
            background-color: var(--light-blue);
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
            color: var(--primary-blue);
            font-weight: 500;
            transition: background-color 0.3s;
        }
        
        .download-link:hover {
            background-color: #d9e7ff;
        }
        
        .download-link i {
            margin-right: 10px;
        }
        
        /* 教程区域 */
        .tutorial {
            padding: 100px 0;
            background-color: var(--white);
        }
        
        .tutorial-steps {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .step {
            display: flex;
            align-items: flex-start;
            margin-bottom: 50px;
        }
        
        .step-number {
            width: 50px;
            height: 50px;
            background-color: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            margin-right: 25px;
            flex-shrink: 0;
        }
        
        .step-content h3 {
            font-size: 22px;
            margin-bottom: 10px;
            color: var(--text-dark);
        }
        
        .step-content p {
            color: var(--text-light);
        }
        
        /* FAQ区域 */
        .faq {
            padding: 100px 0;
            background-color: var(--bg-light);
        }
        
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            background-color: var(--white);
            border-radius: var(--border-radius);
            margin-bottom: 15px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
        }
        
        .faq-question {
            padding: 20px 30px;
            font-size: 18px;
            font-weight: 500;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-question i {
            color: var(--primary-blue);
            transition: transform 0.3s;
        }
        
        .faq-answer {
            padding: 0 30px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s, padding 0.3s;
            color: var(--text-light);
        }
        
        .faq-item.active .faq-answer {
            padding: 0 30px 20px;
            max-height: 500px;
        }
        
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        
        /* 页脚 */
        footer {
            background-color: #0a1a3a;
            color: white;
            padding: 70px 0 30px;
        }
        
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        
        .footer-logo {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 20px;
        }
        
        .footer-about {
            flex: 1;
            min-width: 300px;
            margin-right: 40px;
        }
        
        .footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }
        
        .footer-links h4 {
            font-size: 18px;
            margin-bottom: 20px;
            color: #a6c1ff;
        }
        
        .footer-links ul {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #c2d1ff;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: white;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #a6c1ff;
            font-size: 14px;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .hero-content {
                flex-direction: column;
            }
            
            .hero-text {
                padding-right: 0;
                text-align: center;
                margin-bottom: 50px;
            }
            
            .hero h1 {
                font-size: 40px;
            }
            
            .features-grid {
                grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            }
        }
        
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--white);
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            }
            
            .nav-links.active {
                display: flex;
            }
            
            .nav-links li {
                margin: 10px 0;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .floating-download-btn {
                right: 15px;
                padding: 12px 15px;
            }
            
            .hero h1 {
                font-size: 34px;
            }
            
            .section-title h2 {
                font-size: 30px;
            }
            
            .download-card {
                min-width: 100%;
            }
            
            .footer-about {
                margin-right: 0;
                margin-bottom: 30px;
            }
        }
        
        @media (max-width: 576px) {
            .hero {
                padding: 150px 0 80px;
            }
            
            .hero h1 {
                font-size: 28px;
            }
            
            .btn {
                padding: 12px 25px;
                font-size: 15px;
            }
            
            .features, .download, .tutorial, .faq {
                padding: 70px 0;
            }
            
            .step {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            
            .step-number {
                margin-right: 0;
                margin-bottom: 15px;
            }
        }