/* 全局变量 */
        :root {
            --primary-color: #165DFF;
            --primary-light: #4080FF;
            --primary-dark: #0E42D2;
            --secondary-color: #7CB305;
            --text-color: #333333;
            --text-secondary: #666666;
            --text-light: #999999;
            --bg-color: #F5F7FA;
            --white: #FFFFFF;
            --border-color: #EEEEEE;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --transition: all 0.3s ease;
        }
        
        /* 全局样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--bg-color);
            -webkit-font-smoothing: antialiased;
        }
        
        /* 通用组件 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        a {
            text-decoration: none;
            color: var(--primary-color);
            transition: var(--transition);
        }
        
        a:hover {
            color: var(--primary-dark);
        }
        
        ul, ol {
            list-style: none;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            font-size: 16px;
            font-weight: 500;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            outline: none;
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: var(--white);
        }
        
        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: var(--white);
        }
        
        .btn-outline {
            background-color: transparent;
            border: 1px solid var(--primary-color);
            color: var(--primary-color);
        }
        
        .btn-outline:hover {
            background-color: var(--primary-color);
            color: var(--white);
        }
        
        /* 导航栏 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            z-index: 1000;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo img {
            width: 40px;
            height: 40px;
            margin-right: 12px;
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary-color);
        }
        
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        
        .nav-item {
            position: relative;list-style-type: none
        }
        
        .nav-link {
            display: block;
            font-size: 16px;
            font-weight: 500;
            color: var(--text-color);
            padding: 8px 0;
            transition: var(--transition);
        }
        
        .nav-link:hover,
        .nav-link.active {
            color: var(--primary-color);
        }
        
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
            border-radius: 1px;
        }
        
        .nav-buttons {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-color);
            cursor: pointer;
        }
        
        /* 英雄区域 */
        .hero {
            margin-top: 80px;
            padding: 80px 0;
            background-color: var(--white);
            overflow: hidden;
            position: relative;
        }
        
        .hero-container {
            display: flex;
            align-items: center;
            gap: 60px;
        }
        
        .hero-content {
            flex: 1;
            max-width: 600px;
        }
        
        .hero-title {
            font-size: 48px;
            line-height: 1.2;
            margin-bottom: 24px;
            font-weight: 700;
            color: var(--text-color);
        }
        
        .hero-title span {
            color: var(--primary-color);
        }
        
        .hero-desc {
            font-size: 18px;
            line-height: 1.6;
            margin-bottom: 32px;
            color: var(--text-secondary);
        }
        
        .hero-actions {
            display: flex;
            gap: 20px;
        }
        
        .hero-image {
            flex: 1;
            display: flex;
            justify-content: center;
        }
        
        .hero-image img {
            max-width: 100%;
            height: auto;
        
        }
        
        /* 特性区域 */
        .features {
            padding: 100px 0;
            background-color: var(--bg-color);
        }
        
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
        
        .section-title {
            font-size: 36px;
            margin-bottom: 20px;
            color: var(--text-color);
            position: relative;
            display: inline-block;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--primary-color);
            border-radius: 2px;
        }
        
        .section-desc {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 700px;
            margin: 0 auto;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 60px;
        }
        
        .feature-card {
            background-color: var(--white);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-color);
        }
        
        .feature-icon {
            width: 64px;
            height: 64px;
            background-color: rgba(22, 93, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            font-size: 28px;
            color: var(--primary-color);
        }
        
        .feature-title {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--text-color);
        }
        
        .feature-desc {
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-secondary);
        }
        
        /* 安全保障 */
        .security {
            padding: 100px 0;
            background-color: var(--white);
        }
        
        .security-container {
            display: flex;
            align-items: center;
            gap: 80px;
        }
        
        .security-image {
            flex: 1;
        }
        
        .security-image img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-md);
        }
        
        .security-content {
            flex: 1;
        }
        
        .security-title {
            font-size: 32px;
            margin-bottom: 24px;
            color: var(--text-color);
        }
        
        .security-desc {
            font-size: 16px;
            line-height: 1.8;
            margin-bottom: 32px;
            color: var(--text-secondary);
        }
        
        .security-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        
        .security-item {
            display: flex;
            align-items: flex-start;
            gap: 16px;
        }
        
        .security-item-icon {
            width: 40px;
            height: 40px;
            background-color: rgba(22, 93, 255, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 20px;
            color: var(--primary-color);
            margin-top: 4px;
        }
        
        .security-item-content h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-color);
        }
        
        .security-item-content p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        
        /* 下载区域 */
        .download {
            padding: 100px 0;
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: var(--white);
            text-align: center;
        }
        
        .download-title {
            font-size: 36px;
            margin-bottom: 24px;
        }
        
        .download-desc {
            font-size: 18px;
            max-width: 700px;
            margin: 0 auto 48px;
            line-height: 1.6;
            opacity: 0.9;
        }
        
        .download-buttons {
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
        }
        
        .download-btn {
            display: flex;
            align-items: center;
            gap: 12px;
            background-color: var(--white);
            color: var(--primary-color);
            padding: 16px 32px;
            border-radius: var(--radius-md);
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
        }
        
        .download-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        }
        
        .download-btn i {
            font-size: 24px;
        }
        
        /* 客户评价 */
        .testimonials {
            padding: 100px 0;
            background-color: var(--bg-color);
        }
        
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 60px;
        }
        
        .testimonial-card {
            background-color: var(--white);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-color);
        }
        
        .testimonial-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
        }
        
        .testimonial-rating {
            margin-bottom: 16px;
            color: #FFB547;
        }
        
        .testimonial-rating i {
            margin-right: 4px;
        }
        
        .testimonial-content {
            font-size: 16px;
            line-height: 1.6;
            margin-bottom: 24px;
            color: var(--text-secondary);
        }
        
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        
        .testimonial-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            overflow: hidden;
            border: 3px solid var(--primary-color);
        }
        
        .testimonial-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .testimonial-info h4 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--text-color);
        }
        
        .testimonial-info p {
            font-size: 14px;
            color: var(--text-light);
        }
        
        /* 常见问题 */
        .faq {
            padding: 100px 0;
            background-color: var(--white);
        }
        
        .faq-container {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .faq-list {
            margin-top: 60px;
        }
        
        .faq-item {
            margin-bottom: 16px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
        }
        
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            background-color: var(--white);
            cursor: pointer;
            transition: var(--transition);
            font-size: 16px;
            font-weight: 600;
            color: var(--text-color);
        }
        
        .faq-question:hover {
            background-color: rgba(22, 93, 255, 0.05);
        }
        
        .faq-question i {
            transition: var(--transition);
            color: var(--primary-color);
        }
        
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            background-color: var(--white);
        }
        
        .faq-answer-inner {
            padding: 0 24px 24px;
            font-size: 15px;
            line-height: 1.6;
            color: var(--text-secondary);
        }
        
        .faq-item.active .faq-answer {
            max-height: 500px;
        }
        
        /* 页脚 */
        footer {
            background-color: #0F172A;
            color: var(--white);
            padding: 80px 0 40px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 60px;
        }
        
        .footer-logo {
            display: flex;
            align-items: center;
            margin-bottom: 24px;
        }
        
        .footer-logo img {
            width: 40px;
            height: 40px;
            margin-right: 12px;
        }
        
        .footer-logo-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--white);
        }
        
        .footer-desc {
            font-size: 16px;
            line-height: 1.6;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 24px;
        }
        
        .social-links {
            display: flex;
            gap: 16px;
        }
        
        .social-link {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            color: var(--white);
            transition: var(--transition);
        }
        
        .social-link:hover {
            background-color: var(--primary-color);
            transform: translateY(-3px);
        }
        
        .footer-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 24px;
            color: var(--white);
            position: relative;
            padding-bottom: 12px;
        }
        
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--primary-color);
            border-radius: 1px;
        }
        
        .footer-links li {
            margin-bottom: 16px;
        }
        
        .footer-links a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--white);
            padding-left: 8px;
        }
        
        .contact-info li {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
            color: rgba(255, 255, 255, 0.7);
        }
        
        .contact-info i {
            font-size: 18px;
            color: var(--primary-color);
        }
        
        .copyright {
            text-align: center;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
        }
        
        .copyright-links {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 16px;
        }
        
        .copyright-links a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
        }
        
        .copyright-links a:hover {
            color: var(--white);
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .hero-container,
            .security-container {
                gap: 40px;
            }
            
            .hero-title {
                font-size: 42px;
            }
            
            .security-title {
                font-size: 28px;
            }
        }
        
        @media (max-width: 992px) {
            .nav-menu {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background-color: var(--white);
                flex-direction: column;
                padding: 20px 0;
                box-shadow: var(--shadow-md);
                gap: 0;
            }
            
            .nav-menu.active {
                display: flex;
            }
            
            .nav-item {
                width: 100%;
            }
            
            .nav-link {
                padding: 12px 20px;
            }
            
            .nav-buttons {
                display: none;
            }
            
            .mobile-menu-btn {
                display: block;
            }
            
            .hero-container,
            .security-container {
                flex-direction: column;
                text-align: center;
            }
            
            .hero-content,
            .security-content {
                order: 2;
            }
            
            .hero-image,
            .security-image {
                order: 1;
                margin-bottom: 40px;
            }
            
            .hero-actions {
                justify-content: center;
            }
            
            .security-list {
                grid-template-columns: 1fr;
            }
        }
        
        @media (max-width: 768px) {
            .hero {
                padding: 60px 0;
            }
            
            .hero-title {
                font-size: 36px;
            }
            
            .hero-desc {
                font-size: 16px;
            }
            
            .features,
            .security,
            .download,
            .testimonials,
            .faq {
                padding: 80px 0;
            }
            
            .section-title {
                font-size: 28px;
            }
            
            .download-title {
                font-size: 28px;
            }
            
            .feature-card,
            .testimonial-card {
                padding: 24px;
            }
            
            .download-buttons {
                gap: 16px;
            }
            
            .download-btn {
                padding: 12px 24px;
                font-size: 14px;
            }
            
            .footer-content {
                gap: 30px;
            }
            
            .copyright-links {
                flex-wrap: wrap;
                gap: 10px;
            }
        }
        
        @media (max-width: 576px) {
            .container {
                padding: 0 15px;
            }
            
            .hero {
                margin-top: 70px;
                padding: 50px 0;
            }
            
            .hero-title {
                font-size: 28px;
            }
            
            .hero-actions {
                flex-direction: column;
                gap: 16px;
            }
            
            .btn {
                width: 100%;
                padding: 12px 20px;
            }
            
            .features,
            .security,
            .download,
            .testimonials,
            .faq {
                padding: 60px 0;
            }
            
            .section-title {
                font-size: 24px;
            }
            
            .section-desc {
                font-size: 15px;
            }
            
            .feature-card,
            .testimonial-card {
                padding: 20px;
            }
            
            .feature-icon {
                width: 56px;
                height: 56px;
                font-size: 24px;
            }
            
            .footer {
                padding: 60px 0 30px;
            }
        }