:root {
            --primary-color: #4361ee;
            --primary-light: #4895ef;
            --secondary-color: #3f37c9;
            --accent-color: #f72585;
            --light-gray: #f8f9fa;
            --dark-gray: #212529;
            --white: #ffffff;
            --border-radius: 12px;
            --box-shadow: 0 8px 30px rgba(0,0,0,0.08);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.6;
            background-color: var(--light-gray);
            color: var(--dark-gray);
        }
        
        @supports (font-variation-settings: normal) {
            body {
                font-family: 'Inter var', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            }
        }
        
        header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: var(--white);
            padding: 1.5rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            font-size: 1.5rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        
        nav ul li a {
            color: var(--white);
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
            opacity: 0.9;
            transition: var(--transition);
        }
        
        nav ul li a:hover {
            opacity: 1;
        }
        
        nav ul li a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--white);
            transition: var(--transition);
        }
        
        nav ul li a:hover::after {
            width: 100%;
        }
        
        .hero-section {
            padding: 4rem 0;
            text-align: center;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.1), rgba(63, 55, 201, 0.1));
        }
        
        .hero-title {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 1rem;
            background: linear-gradient(to right, var(--primary-color), var(--accent-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .hero-description {
            font-size: 1.25rem;
            color: #6c757d;
            max-width: 800px;
            margin: 0 auto 2rem;
            line-height: 1.7;
        }
        
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin-top: 2rem;
        }
        
        .btn {
            padding: 0.75rem 1.5rem;
            border-radius: var(--border-radius);
            font-weight: 600;
            text-decoration: none;
            transition: var(--transition);
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: var(--white);
        }
        
        .btn-primary:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        
        .btn-outline {
            border: 2px solid var(--primary-color);
            color: var(--primary-color);
        }
        
        .btn-outline:hover {
            background-color: var(--primary-color);
            color: var(--white);
            transform: translateY(-2px);
        }
        
        .features-section {
            padding: 4rem 0;
        }
        
        .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 3rem;
            color: var(--dark-gray);
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .feature-card {
            background-color: var(--white);
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            text-align: center;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        
        .feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--white);
            font-size: 2rem;
        }
        
        .feature-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--dark-gray);
        }
        
        .feature-description {
            color: #6c757d;
            line-height: 1.7;
        }
        
        /* 分类模块样式 */
        .category-module {
            padding: 3rem 0;
            margin: 2rem 0;
            border-radius: var(--border-radius);
        }
        
        /* 人工智能模块 - 瀑布流布局 */
        .ai-module {
            background: linear-gradient(135deg, #f8f9fa, #e9ecef);
        }
        
        .ai-module .systems-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            grid-auto-rows: minmax(200px, auto);
        }
        
        .ai-module .system-card {
            display: flex;
            flex-direction: column;
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            overflow: hidden;
        }
        
        .ai-module .system-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        
        .ai-module .system-image {
                object-fit: cover;
            height: 300px;
            background: linear-gradient(135deg, #4361ee, #3a0ca3);
            position: relative;
        }
        
        .ai-module .system-image::before {
            content: "AI";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: rgba(255,255,255,0.2);
            font-size: 3rem;
            font-weight: 700;
        }
        
        .ai-module .system-content {
            padding: 1.25rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        
        .ai-module .system-category {
            background: #4361ee;
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            align-self: flex-start;
        }
        
        .ai-module .system-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: #212529;
        }
        
        .ai-module .system-description {
            font-size: 0.9rem;
            color: #6c757d;
            margin-bottom: 1rem;
            line-height: 1.6;
            flex: 1;
        }
        
        .ai-module .system-features {
            margin-bottom: 1rem;
        }
        
        .ai-module .system-features h4 {
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #495057;
        }
        
        .ai-module .system-features ul {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin: 0;
            padding: 0;
            list-style: none;
        }
        
        .ai-module .system-features li {
            background: #f8f9fa;
            color: #4361ee;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 500;
        }
        
        .ai-module .system-link {
            display: inline-flex;
            align-items: center;
            color: #4361ee;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.875rem;
            gap: 0.5rem;
        }
        
        /* 云计算模块 - 横向滑动布局 */
        .cloud-module {
            background: white;
            overflow: hidden;
        }
        
        .cloud-module .systems-grid {
            display: flex;
            gap: 1.5rem;
            overflow-x: auto;
            padding: 1rem 0;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
        }
        
        .cloud-module .system-card {
            flex: 0 0 300px;
            scroll-snap-align: start;
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            overflow: hidden;
            transition: all 0.3s ease;
        }
        
        .cloud-module .system-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        
        .cloud-module .system-image {
            height: 180px;
            background: linear-gradient(135deg, #4895ef, #3f37c9);
            position: relative;
        }
        
        .cloud-module .system-image::before {
            content: "Cloud";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: rgba(255,255,255,0.2);
            font-size: 3rem;
            font-weight: 700;
        }
        
        .cloud-module .system-content {
            padding: 1.5rem;
        }
        
        .cloud-module .system-category {
            background: #4895ef;
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            display: inline-block;
        }
        
        .cloud-module .system-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
            color: #212529;
        }
        
        .cloud-module .system-description {
            color: #6c757d;
            margin-bottom: 1rem;
            line-height: 1.6;
        }
        
        .cloud-module .system-features {
            margin-bottom: 1rem;
        }
        
        .cloud-module .system-features h4 {
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #495057;
        }
        
        .cloud-module .system-features ul {
            margin: 0;
            padding-left: 1rem;
            color: #6c757d;
        }
        
        .cloud-module .system-features li {
            margin-bottom: 0.25rem;
            position: relative;
            padding-left: 1rem;
        }
        
        .cloud-module .system-features li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.5rem;
            width: 6px;
            height: 6px;
            background-color: #4895ef;
            border-radius: 50%;
        }
        
        .cloud-module .system-link {
            display: inline-flex;
            align-items: center;
            color: #4895ef;
            text-decoration: none;
            font-weight: 600;
            gap: 0.5rem;
        }
        
        /* 大数据模块 - 列表布局 */
        .bigdata-module {
            background: #f8f9fa;
        }
        
        .bigdata-module .systems-grid {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        
        .bigdata-module .system-card {
            display: flex;
            background: white;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            overflow: hidden;
            transition: all 0.3s ease;
        }
        
        .bigdata-module .system-card:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .bigdata-module .system-image {
            width: 120px;
            background: linear-gradient(135deg, #4cc9f0, #4895ef);
            position: relative;
        }
        
        .bigdata-module .system-image::before {
            content: "Data";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: rgba(255,255,255,0.2);
            font-size: 2rem;
            font-weight: 700;
        }
        
        .bigdata-module .system-content {
            flex: 1;
            padding: 1rem;
        }
        
        .bigdata-module .system-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.5rem;
        }
        
        .bigdata-module .system-category {
            background: #4cc9f0;
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        
        .bigdata-module .system-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: #212529;
        }
        
        .bigdata-module .system-description {
            font-size: 0.9rem;
            color: #6c757d;
            margin-bottom: 0.75rem;
            line-height: 1.6;
        }
        
        .bigdata-module .system-features {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-bottom: 0.75rem;
        }
        
        .bigdata-module .system-feature-tag {
            background: #f8f9fa;
            color: #4cc9f0;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 500;
        }
        
        .bigdata-module .system-link {
            display: inline-flex;
            align-items: center;
            color: #4cc9f0;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.875rem;
            gap: 0.5rem;
        }
        
        /* 物联网模块 - 网格布局 */
        .iot-module {
            background: white;
        }
        
        .iot-module .systems-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        
        .iot-module .system-card {
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            overflow: hidden;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        
        .iot-module .system-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        
        .iot-module .system-image {
            height: 200px;
            background: linear-gradient(135deg, #7209b7, #4361ee);
            position: relative;
                object-fit: cover;
        }
        
        .iot-module .system-image::before {
            content: "IoT";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: rgba(255,255,255,0.2);
            font-size: 2.5rem;
            font-weight: 700;
        }
        
        .iot-module .system-content {
            padding: 1.25rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        
        .iot-module .system-category {
            background: #7209b7;
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            align-self: flex-start;
        }
        
        .iot-module .system-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: #212529;
        }
        
        .iot-module .system-description {
            font-size: 0.9rem;
            color: #6c757d;
            margin-bottom: 1rem;
            line-height: 1.6;
            flex: 1;
        }
        
        .iot-module .system-link {
            display: inline-flex;
            align-items: center;
            color: #7209b7;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.875rem;
            gap: 0.5rem;
        }
        
        /* 安全模块 - 3D卡片效果 */
        .security-module {
            background: #212529;
            color: white;
        }
        
        .security-module .systems-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            perspective: 1000px;
        }
        
        .security-module .system-card {
            background: #343a40;
            border-radius: 12px;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
            overflow: hidden;
            transition: all 0.5s ease;
            position: relative;
            transform-style: preserve-3d;
        }
        
        .security-module .system-card:hover {
            transform: translateY(-10px) rotateX(5deg);
            box-shadow: 0 15px 30px rgba(0,0,0,0.3);
        }
        
        .security-module .system-image {
            height: 300px;
            background: linear-gradient(135deg, #f72585, #7209b7);
            position: relative;
            object-fit: cover;
        }
        
        .security-module .system-image::before {
            content: "Sec";
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: rgba(255,255,255,0.1);
            font-size: 3rem;
            font-weight: 700;
        }
        
        .security-module .system-content {
            padding: 1.5rem;
        }
        
        .security-module .system-category {
            background: #f72585;
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.75rem;
            display: inline-block;
        }
        
        .security-module .system-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 0.75rem;
            color: white;
        }
        
        .security-module .system-description {
            color: #adb5bd;
            margin-bottom: 1rem;
            line-height: 1.6;
        }
        
        .security-module .system-features {
            margin-bottom: 1rem;
        }
        
        .security-module .system-features h4 {
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: white;
        }
        
        .security-module .system-features ul {
            margin: 0;
            padding-left: 1rem;
            color: #adb5bd;
        }
        
        .security-module .system-features li {
            margin-bottom: 0.25rem;
            position: relative;
            padding-left: 1rem;
        }
        
        .security-module .system-features li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.5rem;
            width: 6px;
            height: 6px;
            background-color: #f72585;
            border-radius: 50%;
        }
        
        .security-module .system-link {
            display: inline-flex;
            align-items: center;
            color: #f72585;
            text-decoration: none;
            font-weight: 600;
            gap: 0.5rem;
        }
        
        .testimonials-section {
            padding: 4rem 0;
            background: linear-gradient(135deg, rgba(67, 97, 238, 0.05), rgba(63, 55, 201, 0.05));
        }
        
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .testimonial-card {
            background-color: var(--white);
            padding: 2rem;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            position: relative;
        }
        
        .testimonial-quote {
            font-size: 1.25rem;
            font-style: italic;
            color: var(--dark-gray);
            margin-bottom: 1.5rem;
            line-height: 1.7;
        }
        
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        
        .author-avatar {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background-color: var(--light-gray);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
            font-weight: 700;
        }
        
        .author-info h4 {
            margin: 0;
            font-size: 1rem;
            font-weight: 700;
            color: var(--dark-gray);
        }
        
        .author-info p {
            margin: 0;
            color: #6c757d;
            font-size: 0.875rem;
        }
        
        .cta-section {
            padding: 4rem 0;
            text-align: center;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: var(--white);
        }
        
        .cta-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        
        .cta-description {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            opacity: 0.9;
        }
        
        footer {
            background-color: var(--dark-gray);
            color: var(--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 {
            margin: 0 0 1rem 0;
            font-size: 1.125rem;
            font-weight: 600;
        }
        
        .footer-section p {
            color: #adb5bd;
            margin-bottom: 0.75rem;
            line-height: 1.6;
        }
        
        .footer-section a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
            display: block;
            margin-bottom: 0.5rem;
        }
        
        .footer-section a:hover {
            color: var(--white);
        }
        
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #495057;
            color: #adb5bd;
        }
        
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 1rem;
            }
            
            nav ul {
                gap: 1rem;
            }
            
            .hero-title {
                font-size: 2rem;
            }
            
            .hero-description {
                font-size: 1.1rem;
            }
            
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .section-title {
                font-size: 1.75rem;
            }
        }