/* 全局重置与基础样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "Microsoft Yahei", "PingFang SC", Arial, sans-serif;
        }

        /* 科技感淡蓝灰背景：契合智能照明主题，不刺眼且突出内容 */
        body {
            background-color: #f5f8ff;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            color: #333;
            line-height: 1.6;
        }

        /* 容器：控制宽度，居中内容 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 5%;
            flex: 1;
        }

        /* 导航栏：固定顶部，增强品牌辨识度 */
        header {
            background: #fff;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 0;
            z-index: 999;
        }
        
        .navbar-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 75px;
        }

        .nav-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            color: #212529;
            text-decoration: none;
            font-weight: 700;
            font-size: clamp(1.1rem, 2vw, 1.3rem);
        }

        .nav-brand img {
            height: clamp(2.2rem, 4vw, 3.2rem);
        }

        /* 汉堡菜单：移动端适配，样式统一 */
        .menu-toggle {
            display: none;
            flex-direction: column;
            cursor: pointer;
            z-index: 1000;
        }
        
        .bar {
            width: 24px;
            height: 2.5px;
            background-color: #333;
            margin: 3px 0;
            transition: 0.3s;
            border-radius: 3px;
        }

        /* 导航链接：hover效果增强交互感 */
        .nav-links {
            display: flex;
            gap: 2rem;
            align-items: center;
        }

        .nav-links a {
            color: #495057;
            text-decoration: none;
            font-size: clamp(0.9rem, 1.5vw, 1.05rem);
            position: relative;
            padding: 0.5rem 0;
            transition: color 0.3s;
        }

        .nav-links a:hover {
            color: #007bff;
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: #007bff;
            transition: width 0.3s ease;
        }
        
        .nav-links a:hover::after {
            width: 100%;
        }

        /* 头部Banner：简单大气，传递核心价值（强化SEO关键词） */
        .header-banner {
            padding: 2.5rem 0;
            text-align: center;
            margin-bottom: 1.5rem;
        }

        .banner-title {
            font-size: clamp(1.5rem, 3vw, 2.2rem);
            color: #212529;
            margin-bottom: 0.8rem;
            font-weight: 700;
        }

        .banner-desc {
            font-size: clamp(0.95rem, 1.8vw, 1.1rem);
            color: #6c757d;
            max-width: 800px;
            margin: 0 auto;
        }

        /* 卡片容器：优化间距，适配不同屏幕 */
        .card-container {
            display: flex;
            flex-wrap: wrap;
            gap: 2rem;
            justify-content: center;
            margin-bottom: 3rem;
        }

        /* 产品卡片：分层设计，增强立体感 */
        .card-group {
            background: #fff;
            border-radius: 12px;
            padding: 2rem;
            width: 100%;
            max-width: 600px;
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            border: 1px solid #e8f1ff;
        }
        
        .card-group:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
            border-color: #d1e7ff;
        }

        /* 卡片标题：强化视觉引导 */
        .card-title {
            font-size: clamp(1.2rem, 2vw, 1.5rem);
            margin-bottom: 1.8rem;
            color: #212529;
            display: flex;
            align-items: center;
            gap: 12px;
            padding-bottom: 1rem;
            border-bottom: 2px solid #007bff;
            font-weight: 600;
        }

        .card-title i {
            color: #007bff;
            font-size: 1.4rem;
        }

        /* 产品项布局：移动端强制2列，缩短页面 */
        .card-items {
            display: grid;
            grid-template-columns: repeat(3, 1fr); /* PC端3列 */
            gap: 1.2rem;
        }

        .card-item {
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 1.1rem 0.8rem;
            background: #fafdff;
            border: 1px solid #e8f1ff;
            border-radius: 8px;
            text-decoration: none;
            color: #495057;
            transition: all 0.3s ease;
            font-size: clamp(0.9rem, 1.5vw, 1.05rem);
            position: relative;
            overflow: hidden;
        }

        /* 产品项hover效果：科技感高亮 */
        .card-item:hover {
            border-color: #007bff;
            color: #007bff;
            background-color: #eaf5ff;
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 123, 255, 0.1);
        }

        /* 小图标点缀：增强科技感 */
        .card-item::before {
            content: "\f0eb"; /* 灯泡图标 */
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            position: absolute;
            top: 8px;
            right: 8px;
            font-size: 0.6rem;
            color: #007bff;
            opacity: 0;
            transition: opacity 0.3s;
        }

        .card-item:hover::before {
            opacity: 0.7;
        }

        /* 响应式调整：重点优化移动端 */
        @media (max-width: 768px) {
            .navbar-container {
                height: 70px;
                position: relative;
            }
            
            .menu-toggle {
                display: flex;
            }
            
            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                height: 100vh;
                width: 220px;
                background-color: #fff;
                flex-direction: column;
                justify-content: center;
                padding: 2rem;
                gap: 2rem;
                box-shadow: -2px 0 15px rgba(0,0,0,0.1);
                transition: 0.3s ease;
                z-index: 999;
            }
            
            .nav-links.active {
                right: 0;
            }
            
            .nav-links a {
                font-size: 1rem;
                padding: 0.8rem 1rem;
                width: 100%;
                text-align: left;
                border-radius: 6px;
            }
            
            .nav-links a:hover {
                background-color: #f5f8ff;
            }

            /* 平板端：2列布局 */
            .card-items {
                grid-template-columns: repeat(2, 1fr);
            }
            
            .card-group {
                padding: 1.5rem;
            }

            .header-banner {
                padding: 2rem 0;
            }
        }

        /* 手机端：强制2列，优化间距 */
        @media (max-width: 480px) {
            .card-items {
                grid-template-columns: repeat(2, 1fr);
                gap: 0.9rem;
            }
            
            .card-container {
                gap: 1.2rem;
            }
            
            .card-item {
                padding: 0.9rem 0.6rem;
                font-size: 0.85rem;
            }

            .banner-title {
                font-size: clamp(1.3rem, 3vw, 1.8rem);
            }
        }

        /* 页脚：稳重专业，补充品牌信息 */
        footer {
            text-align: center;
            padding: 2.5rem 5%;
            color: #6c757d;
            background-color: #fff;
            border-top: 1px solid #e8f1ff;
            margin-top: auto;
        }
        
        footer .footer-title {
            font-size: 1.1rem;
            color: #212529;
            margin-bottom: 1rem;
            font-weight: 600;
        }
        
        footer .footer-links {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin-bottom: 1.2rem;
            flex-wrap: wrap;
        }
        
        footer .footer-links a {
            color: #6c757d;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        footer .footer-links a:hover {
            color: #007bff;
        }
        
        footer .copyright {
            font-size: clamp(0.85rem, 1.5vw, 0.95rem);
            margin-top: 1rem;
        }