/* 基础样式 */
        :root {
            --primary: #165DFF;
            --secondary: #69B1FF;
            --dark: #1D2129;
            --light: #F2F3F5;
            --gray: #86909C;
            --card-bg: #FFFFFF;
            --border-radius: 8px;
            --shadow: 0 4px 20px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', 'Microsoft Yahei', sans-serif;
        }

        body {
            line-height: 1.7;
            color: var(--dark);
            background-color: #F7F8FA;
        }

        .container {
            width: 1200px;
            max-width: 100%;
            margin: 0 auto;
            padding: 0 20px;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

        h1, h2, h3, h4 {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--dark);
        }

        h2 {
            font-size: 2rem;
            position: relative;
            display: inline-block;
            margin: 40px 0;
        }

        h2::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 60px;
            height: 3px;
            background-color: var(--primary);
        }

        p {
            color: var(--gray);
            margin-bottom: 1.5rem;
        }

        /* 导航栏 */
        header {
            background-color: var(--card-bg);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 0;
        }

        /* Logo 样式（仅“恩莲”二字）- 黑体加粗、字号突出 */
        .logo {
            font-family: 'SimHei', 'Microsoft YaHei', 'Inter', sans-serif; /* 黑体 */
            font-size: 1.8rem; /* 放大字号，突出 Logo */
            font-weight: bold; /* 加粗 */
            color: var(--primary); /* 主色调，增强视觉焦点 */
            display: flex;
            align-items: center;
        }

        /* 品牌全名样式 - 普通字体、字号适中 */
        .brand {
            font-family: 'Inter', 'Microsoft Yahei', sans-serif; /* 普通字体，不使用黑体 */
            font-size: 1.1rem; /* 字号小于 Logo，作为辅助说明 */
            font-weight: 500; /* 常规字重 */
            color: var(--dark); /* 深色，不抢 Logo 焦点 */
            margin-left: 10px;
            white-space: nowrap;
        }

        .desktop-menu {
            display: flex;
            gap: 35px;
        }

        .desktop-menu a {
            color: var(--dark);
            font-weight: 500;
            position: relative;
        }

        .desktop-menu a:hover {
            color: var(--primary);
        }

        .desktop-menu a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: var(--transition);
        }

        .desktop-menu a:hover::after {
            width: 100%;
        }

        .mobile-menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--dark);
        }

        .mobile-menu {
            display: none;
            background-color: var(--card-bg);
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            box-shadow: 0 5px 10px rgba(0,0,0,0.05);
            padding: 15px 0;
        }

        .mobile-menu a {
            display: block;
            padding: 12px 20px;
            border-bottom: 1px solid #F0F0F0;
            color: var(--dark);
            font-weight: 500;
        }

        .mobile-menu a:hover {
            color: var(--primary);
            background-color: #F7F8FA;
        }

        /* 主要内容区域 */
        section {
            padding: 80px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-header h2 {
            margin: 0 auto 20px;
        }

        .card {
            background-color: var(--card-bg);
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            padding: 30px;
            transition: var(--transition);
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }

        /* 英雄区域 */
        .hero {
            background: linear-gradient(135deg, #F7F8FA 0%, #EEF1F5 100%);
            padding: 120px 0;
            position: relative;
            overflow: hidden;
        }

        .hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 40px;
        }

        .hero-text {
            flex: 1 1 500px;
            z-index: 1;
        }

        .hero-text h1 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            line-height: 1.3;
        }

        .hero-text p {
            font-size: 1.1rem;
            margin-bottom: 30px;
            color: var(--dark);
        }

        .hero-image {
            flex: 1 1 400px;
            text-align: center;
            z-index: 1;
        }

        .hero-image img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }

        .hero-shape {
            position: absolute;
            top: 0;
            right: 0;
            width: 50%;
            height: 100%;
            background-color: rgba(22, 93, 255, 0.05);
            border-radius: 50% 0 0 50%;
            transform: translateX(50%);
        }

        /* 关于我们 */
        .about-content {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
            align-items: center;
        }

        .about-text {
            flex: 1 1 500px;
        }

        .about-image {
            flex: 1 1 400px;
            text-align: center;
        }

        .about-image img {
            max-width: 100%;
            height: auto;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }

        .advantages {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 40px;
        }

        .advantage-item {
            display: flex;
            align-items: flex-start;
            gap: 15px;
            padding: 20px;
            background-color: #F7F8FA;
            border-radius: var(--border-radius);
        }

        .advantage-item i {
            font-size: 1.5rem;
            color: var(--primary);
            margin-top: 3px;
        }

        /* 解决方案 */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .solution-card {
            border-top: 3px solid var(--primary);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .solution-card h3 {
            font-size: 1.3rem;
            margin-bottom: 15px;
        }

        /* 产品中心 - 核心优化：图片尺寸适配 */
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .product-card {
            overflow: hidden;
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        /* 单张产品图片容器 - 固定高度，保证比例 */
        .product-image {
            height: 180px; /* 优化高度，适配卡片尺寸 */
            background-color: #F7F8FA;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            border-radius: var(--border-radius) var(--border-radius) 0 0;
            position: relative;
            overflow: hidden;
        }

        /* 产品图片适配 - 防止拉伸，居中裁剪 */
        .product-image img {
            width: 100%;
            height: 100%;
            object-fit: cover; /* 保持比例，裁剪多余部分 */
            transition: transform 0.5s ease;
        }

        /* 多张产品图片容器 - 双图等分，统一高度 */
        .product-images {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
            height: 180px; /* 与单图容器高度一致 */
            margin-bottom: 20px;
            border-radius: var(--border-radius) var(--border-radius) 0 0;
            overflow: hidden;
        }

        .product-images img {
            width: 100%;
            height: 100%;
            object-fit: cover; /* 保持比例 */
            transition: transform 0.5s ease;
        }

        .product-card:hover .product-image img,
        .product-card:hover .product-images img {
            transform: scale(1.05); /* hover 缩放效果 */
        }

        .product-card h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
        }

        /* 技术研发能力 */
        .tech-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }

        .tech-card {
            text-align: center;
            padding: 40px 20px;
        }

        .tech-card i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 20px;
        }

        /* 联系我们 */
        .contact-container {
            display: flex;
            flex-wrap: wrap;
            gap: 40px;
        }

        .contact-info {
            flex: 1 1 300px;
        }

        .contact-form {
            flex: 1 1 500px;
        }

        .contact-details {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }

        .contact-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px;
            background-color: #F7F8FA;
            border-radius: var(--border-radius);
            text-align: center;
        }

        .contact-item i {
            font-size: 1.8rem;
            color: var(--primary);
            margin-bottom: 15px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: var(--dark);
            font-weight: 500;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #DCDFE6;
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.1);
        }

        .btn {
            display: inline-block;
            padding: 12px 25px;
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: var(--border-radius);
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn:hover {
            background-color: #0E42D2;
            transform: translateY(-2px);
        }

        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: #C9CDD4;
            padding: 60px 0 30px;
        }

        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: white;
            font-size: 1.1rem;
            margin-bottom: 20px;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 12px;
        }

        .footer-links a {
            color: #C9CDD4;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }

        .social-links {
            display: flex;
            gap: 15px;
            margin-top: 20px;
        }

        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            color: white;
            transition: var(--transition);
        }

        .social-links a:hover {
            background-color: var(--primary);
            transform: translateY(-3px);
        }

        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #9CA3AF;
        }

        /* 响应式设计 */
        @media (max-width: 992px) {
            .desktop-menu {
                gap: 25px;
            }
            .hero-text h1 {
                font-size: 2rem;
            }
        }

        @media (max-width: 768px) {
            .desktop-menu {
                display: none;
            }
            .mobile-menu-toggle {
                display: block;
            }
            h2 {
                font-size: 1.6rem;
            }
            section {
                padding: 60px 0;
            }
            .hero {
                padding: 80px 0;
            }
            .hero-text h1 {
                font-size: 1.8rem;
            }
            .footer-content {
                grid-template-columns: 1fr 1fr;
            }
            /* 移动端产品图片稍缩小 */
            .product-image, .product-images {
                height: 160px;
            }
        }

        @media (max-width: 576px) {
            .navbar {
                padding: 15px 0;
            }
            .logo {
                font-size: 1.5rem;
            }
            .brand {
                font-size: 0.9rem;
            }
            .section-header {
                margin-bottom: 40px;
            }
            .hero-text h1 {
                font-size: 1.5rem;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
            /* 小屏产品图片进一步优化 */
            .product-image, .product-images {
                height: 140px;
            }
        }