/* 保留原有CSS变量和基础样式 */
        :root {
            --primary: #108391;
            --primary-light: #3aa3b3;
            --primary-dark: #0c6c7a;
            --secondary: #2a9d8f;
            --accent: #e63946;
            --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;
        }
        
        /* 将容器宽度调整为1300px */
        .container {
            width: 100%;
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 左侧导航栏样式 - 移动端隐藏 */
        .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(rgb(16 131 145 / 57%), rgb(12 108 122 / 48%)), 
                url('http://62.123.com/static/jixie/picture/shengwu.jpg') 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, 57, 70, 0.4);
            letter-spacing: 0.5px;
        }
        
        .btn:hover {
            background: #d32f2f;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(230, 57, 70, 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;
        }
        
        /* 技术介绍部分 */
        .intro {
            background: 
                linear-gradient(rgb(248 249 250 / 54%), rgb(248 249 250 / 21%)),
                url('http://62.123.com/static/jixie/picture/yao.jpg') center/cover no-repeat;
            position: relative;
        }
        
        .intro-content {
            display: flex;
            align-items: center;
            gap: 70px;
        }
        
        .intro-text {
            flex: 1;
        }
        
        .intro-text h3 {
            font-size: 2rem;
            color: var(--dark);
            margin-bottom: 24px;
            font-weight: 600;
        }
        
        .intro-text p {
            margin-bottom: 22px;
            font-size: 1.1rem;
            line-height: 1.7;
        }



        
        .intro-image {
            flex: 1;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
            transition: transform 0.5s;
        }
        
        .intro-image:hover {
            transform: translateY(-10px);
        }
        
        .intro-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        
        /* 应用范围部分 - 移动端并排两个，自动缩小显示 */
        .applications {
            background: white;
        }
        
        .apps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 35px;
        }
        
        /* 移动端应用范围并排两个，自动缩小显示 */
        @media (max-width: 768px) {
            .apps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 15px;
            }
            
            .app-card {
                padding: 20px 15px;
                transform: scale(0.95);
                transition: transform 0.3s;
            }
            
            .app-card:hover {
                transform: scale(0.98) translateY(-5px);
            }
            
            .app-icon {
                width: 50px;
                height: 50px;
                font-size: 20px;
                margin-bottom: 15px;
            }
            
            .app-card h3 {
                font-size: 1.1rem;
                margin-bottom: 10px;
            }
            
            .app-card p {
                font-size: 0.9rem;
                line-height: 1.5;
            }
        }
        
        .app-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);
            border-top: 5px solid var(--primary);
            position: relative;
            overflow: hidden;
        }
        
        .app-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;
        }
        
        .app-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
        }
        
        .app-card:hover:before {
            transform: scaleX(1);
        }
        
        .app-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(16, 131, 145, 0.3);
        }
        
        .app-card h3 {
            font-size: 1.5rem;
            margin-bottom: 18px;
            color: var(--dark);
            font-weight: 600;
        }
        
        .app-card p {
            color: var(--text);
            line-height: 1.7;
        }
        
        /* 留言按钮样式 */
        .contact-btn-container {
            text-align: center;
            margin-top: 60px;
        }
        
        .contact-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 15px 40px;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 6px 20px rgba(16, 131, 145, 0.3);
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        
        .contact-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 10px 25px rgba(16, 131, 145, 0.4);
        }
        
        /* 留言弹窗样式 */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 2000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        
        .modal-overlay.active {
            opacity: 1;
            visibility: visible;
        }
        
        .contact-modal {
            background: white;
            border-radius: 15px;
            width: 90%;
            max-width: 600px;
            padding: 40px;
            position: relative;
            transform: translateY(50px);
            transition: transform 0.3s;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
        }
        
        .modal-overlay.active .contact-modal {
            transform: translateY(0);
        }
        
        .close-modal {
            position: absolute;
            top: 20px;
            right: 20px;
            background: none;
            border: none;
            font-size: 24px;
            cursor: pointer;
            color: var(--gray);
            transition: color 0.3s;
        }
        
        .close-modal:hover {
            color: var(--accent);
        }
        
        .contact-form {
            margin-top: 20px;
        }
        
        .form-group {
            margin-bottom: 25px;
        }
        
        .form-control {
            width: 100%;
            padding: 15px 20px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.3s;
            font-family: inherit;
        }
        
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(16, 131, 145, 0.1);
        }
        
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        
        .submit-btn {
            width: 100%;
            padding: 15px;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        
        .submit-btn:hover {
            background: var(--primary-dark);
        }
        
        /* 响应式设计 */
        @media (max-width: 1300px) {
            .case-item, .product-card {
                flex: 0 0 calc(50% - 15px); /* 中等屏幕显示2个 */
            }
        }
        
        @media (max-width: 1100px) {
            .hero h1 {
                font-size: 2.8rem;
            }
            
            .hero p {
                font-size: 1.2rem;
            }
        }
        
        @media (max-width: 992px) {
            .intro-content {
                flex-direction: column;
            }
            
            .intro-image {
                margin-top: 50px;
            }
            
            .section-title h2 {
                font-size: 2.4rem;
            }
            
            .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) {
            /* 隐藏左侧导航栏和菜单按钮 */
            .menu-toggle {
                display: none;
            }
            
            .side-nav {
                display: none;
            }
            
            .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;
            }
        }