:root {
            --primary: #1e3a5f;
            --primary-light: #2a4d7a;
            --primary-dark: #152842;
            --secondary: #4a7b9d;
            --accent: #e67e22;
            --light: #f8f9fa;
            --dark: #212529;
            --text: #495057;
            --gray: #6c757d;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            color: var(--text);
            line-height: 1.6;
            background-color: #ffffff;
            overflow-x: hidden;
        }
        
        .container {
            width: 100%;
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 左侧导航栏样式 - 移动端默认隐藏 */
        .side-nav {
            position: fixed;
            left: 30px;
            top: 50%;
            transform: translateY(-50%);
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 15px;
            padding: 20px 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            display: flex;
            flex-direction: column;
            gap: 15px;
            transition: left 0.3s;
        }
        
        .side-nav a {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: all 0.3s;
            padding: 10px 15px;
            border-radius: 8px;
            position: relative;
        }
        
        .side-nav a:hover, .side-nav a.active {
            background: var(--primary);
            color: white;
            transform: translateX(5px);
        }
        
        .side-nav a i {
            margin-right: 10px;
            font-size: 18px;
        }
        
        .menu-toggle {
            display: none;
            position: fixed;
            top: 20px;
            left: 20px;
            z-index: 1100;
            background: var(--primary);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            cursor: pointer;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
        }
        
        /* 英雄区域样式 */
        .hero {
            padding: 180px 0 120px;
            background: 
                linear-gradient(rgba(30, 58, 95, 0.7), rgba(21, 40, 66, 0.8)), 
                url('https://images.unsplash.com/photo-1581092580497-e0d23cbdf1dc?ixlib=rb-1.2.1&auto=format&fit=crop&w=1600&h=900&q=80') center/cover no-repeat;
            color: white;
            text-align: center;
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        
        .hero-content {
            max-width: 900px;
            margin: 0 auto;
        }
        
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 24px;
            font-weight: 700;
            line-height: 1.2;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        
        .hero p {
            font-size: 1.25rem;
            margin: 0 auto 50px;
            max-width: 750px;
            opacity: 0.95;
            line-height: 1.6;
        }
        
        .btn {
            display: inline-block;
            padding: 15px 35px;
            background: var(--accent);
            color: white;
            border-radius: 6px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
            font-size: 16px;
            box-shadow: 0 4px 14px rgba(230, 126, 34, 0.4);
            letter-spacing: 0.5px;
        }
        
        .btn:hover {
            background: #d35400;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(230, 126, 34, 0.5);
        }
        
        .btn-outline {
            background: transparent;
            border: 2px solid white;
            margin-left: 20px;
            box-shadow: none;
        }
        
        .btn-outline:hover {
            background: white;
            color: var(--primary);
            box-shadow: 0 8px 20px rgba(255, 255, 255, 0.2);
        }
        
        /* 通用部分样式 */
        section {
            padding: 100px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 70px;
        }
        
        .section-title h2 {
            font-size: 2.6rem;
            color: var(--dark);
            margin-bottom: 18px;
            position: relative;
            display: inline-block;
            font-weight: 700;
        }
        
        .section-title h2:after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            border-radius: 3px;
        }
        
        .section-title p {
            max-width: 750px;
            margin: 25px auto 0;
            color: var(--text);
            font-size: 1.15rem;
            line-height: 1.7;
        }
        
        /* 技术优势部分 - 移动端两列布局 */
        .advantages {
            background: var(--light);
        }
        
        .advantages-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .advantage-card {
            background: white;
            padding: 40px 30px;
            border-radius: 15px;
            text-align: center;
            transition: all 0.4s;
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
            position: relative;
            overflow: hidden;
        }
        
        .advantage-card:before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            transform: scaleX(0);
            transition: transform 0.4s;
        }
        
        .advantage-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
        }
        
        .advantage-card:hover:before {
            transform: scaleX(1);
        }
        
        .advantage-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 28px;
            color: white;
            font-size: 32px;
            box-shadow: 0 10px 25px rgba(30, 58, 95, 0.3);
        }
        
        .advantage-card h3 {
            font-size: 1.5rem;
            margin-bottom: 18px;
            color: var(--dark);
            font-weight: 600;
        }
        
        .advantage-card p {
            color: var(--text);
            line-height: 1.7;
        }
        
        /* 应用领域部分 */
        .applications {
            background: white;
        }
        
        .apps-tabs {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            margin-bottom: 50px;
        }
        
        .tab-btn {
            padding: 12px 30px;
            background: white;
            border: 1px solid #e0e0e0;
            border-radius: 30px;
            margin: 0 10px 15px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 500;
        }
        
        .tab-btn.active, .tab-btn:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        .app-content {
            display: flex;
            align-items: center;
            gap: 50px;
        }
        
        .app-text {
            flex: 1;
        }
        
        .app-text h3 {
            font-size: 1.8rem;
            color: var(--dark);
            margin-bottom: 20px;
        }
        
        .app-text p {
            margin-bottom: 20px;
            line-height: 1.7;
        }
        
        .app-features {
            list-style: none;
            margin: 25px 0;
        }
        
        .app-features li {
            margin-bottom: 12px;
            display: flex;
            align-items: center;
        }
        
        .app-features li:before {
            content: '✓';
            color: var(--secondary);
            margin-right: 12px;
            font-weight: bold;
            background: rgba(74, 123, 157, 0.1);
            width: 26px;
            height: 26px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .app-image {
            flex: 1;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
        }
        
        .app-image img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s;
        }
        
        .app-image:hover img {
            transform: scale(1.05);
        }
        
        /* 响应式设计 */
        @media (max-width: 1100px) {
            .hero h1 {
                font-size: 2.8rem;
            }
            
            .hero p {
                font-size: 1.2rem;
            }
        }
        
        @media (max-width: 992px) {
            .section-title h2 {
                font-size: 2.4rem;
            }
            
            .app-content {
                flex-direction: column;
            }
            
            .app-image {
                margin-top: 30px;
            }
            
            .side-nav {
                left: 20px;
                padding: 15px 10px;
            }
            
            .side-nav a span {
                display: none;
            }
            
            .side-nav a i {
                margin-right: 0;
                font-size: 20px;
            }
        }
        
        @media (max-width: 768px) {
            /* 移动端隐藏左侧导航及菜单按钮 */
            .side-nav, .menu-toggle {
                display: none !important;
            }
            
            /* 技术优势移动端两列布局 */
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            
            .btn-outline {
                margin-left: 0;
                margin-top: 20px;
                display: inline-block;
            }
            
            .hero h1 {
                font-size: 2.4rem;
            }
            
            .hero p {
                font-size: 1.1rem;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .advantage-card {
                padding: 25px 20px;
            }
            
            .advantage-icon {
                width: 60px;
                height: 60px;
                font-size: 24px;
                margin-bottom: 20px;
            }
            
            .advantage-card h3 {
                font-size: 1.3rem;
            }
            
            .apps-tabs {
                flex-wrap: wrap;
            }
            
            .tab-btn {
                flex: 0 0 calc(50% - 20px);
                text-align: center;
                margin-bottom: 10px;
            }
        }
        
        @media (max-width: 576px) {
            /* 超小屏保持两列布局 */
            .advantages-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .tab-btn {
                flex: 0 0 100%;
            }
        }