:root {
            --primary-color: #2563eb;
            --hover-color: #1d4ed8;
            --text-dark: #1f2937;
            --text-light: #f9fafb;

			--primary-color-2: #2c3e50;
            --accent-color: #3498db;
            --text-light-2: #ecf0f1;
        }

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

        body {
            line-height: 1.6;
            color: var(--text-dark);
        }

        a, a:hover, a:visited {
            text-decoration: none;
            color: white;
        }

        /* 导航栏样式 */
        nav {
            background: rgba(255, 255, 255, 0.95);
            padding: 1rem 5%;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }

        .nav-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: 600;
            color: var(--primary-color);
            text-decoration: none;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            position: relative;
        }

        .nav-links a {
            color: var(--text-dark);
            text-decoration: none;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }

        .nav-links a:hover {
            background: var(--primary-color);
            color: white;
        }

        /* 下拉菜单 */
       .dropdown {
            position: relative;

            height: 100%; /* 保持与导航栏高度一致 */
            display: flex;
            align-items: center;
        }

        .dropdown > a {
            height: 100%;
            display: flex;
            align-items: center;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            top: calc(100% - 10px); /* 增加间距避免粘连 */
            left: 50%;
			padding-top:15px;
			transition: opacity 0.3s, transform 0.2s;
            opacity: 0;
            transform: translateY(10px);
            /*transform: translateX(-50%);*/ /* 水平居中 */
            background: white;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
            border-radius: 6px;
            min-width: 200px;
            width: max-content; /* 根据内容自动扩展 */
            padding: 0.5rem 0;
            border-top: 3px solid var(--primary-color); /* 顶部装饰线 */
        }

		.dropdown-content::before {
            content: '';
            position: absolute;
            top: -10px;
            left: 0;
            right: 0;
            height: 20px; /* 增加悬停热区 */
        }

        .dropdown:hover .dropdown-content {
            display: block;
            animation: fadeIn 0.3s ease;
			opacity: 1;
            transform: translateY(0);
        }

        .dropdown-content a {
            display: block;
            padding: 0.8rem 1.5rem;
            color: var(--text-dark);
            transition: all 0.2s ease;
        }

        .dropdown-content a:hover {
            background: #a3a4a6;/*#f3f4f6;*/
            transform: translateX(4px);
        }

        /* 主要内容 */
        .hero {
             /*background: linear-gradient(135deg, rgba(37,99,235,0.9) 0%, rgba(29,78,216,0.9) 100%),
                        url('https://source.unsplash.com/random/1920x1080?tech');
						*/


			 /* 视口高度容器 */
			 height: 80vh;
			  
			  /* 背景系统 */
			 background-image: 
				/*linear-gradient(rgba(10, 10, 10, 0.3), rgba(10, 10, 10, 0.3)),*/
				url("../images/hero.jpg");
			  
			 /* 精准定位控制 */
			 background-position: center center;  /* XY轴双居中 */
			 background-size: cover;             /* 智能填充模式 */
			 background-repeat: no-repeat;       /* 禁用平铺 */

			 /* 弹性布局系统 */
			 display: flex;
			 justify-content: center;
			 align-items: center;



             text-align: center;
             color: var(--text-light);
             padding: 0 5%;
             margin-top: 68px;
        }

        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            animation: slideUp 1s ease;
        }

        .cta-button {
            padding: 1rem 2.5rem;
            background: white;
            color: var(--primary-color);
            border: none;
            border-radius: 30px;
            cursor: pointer;
            font-size: 1.1rem;
            font-weight: 500;
            transition: all 0.3s ease;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }

        .cta-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }

        /* 产品区块 */
        section {
            padding: 6rem 5%;
            max-width: 1200px;
            margin: 0 auto;
        }

        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin-top: 3rem;
        }

        .feature-card {
            padding: 2.5rem;
            background: white;
            border-radius: 12px;
            text-align: center;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }

        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }

        /* 页脚 */
        footer {
            background: var(--text-dark);
            color: var(--text-light);
            text-align: center;
            padding: 4rem 5%;
            margin-top: 4rem;
			font-size:14px;
        }

        /* 动画 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes slideUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            
            .hero-content h1 {
                font-size: 2.5rem;
            }

            .menu-toggle {
                display: block;
                font-size: 1.5rem;
                color: var(--text-dark);
                cursor: pointer;
            }

            .mobile-menu-active{
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: white;
                padding: 1rem;
            }
        }

		 .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        h1 {
            text-align: center;
            color: var(--primary-color-2);
            margin-bottom: 1rem;
            font-size: 2.5rem;
        }
        h5 {
            text-align: center;
            color: var(--primary-color-2);
            margin-bottom: 2rem;
            font-size: 1.0rem;
        }

        .models-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            padding: 1rem;
        }

        .model-card {
            background: white;
            border-radius: 15px;
            padding: 2rem;
            position: relative;
            cursor: pointer;
            transition: transform 0.3s ease;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .model-card:hover {
            transform: translateY(-10px);
        }

        .model-icon {
            font-size: 3rem;
            color: var(--accent-color);
            margin-bottom: 1rem;
            transition: color 0.3s ease;
        }

        .model-title {
            color: var(--primary-color-2);
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }

        .model-description {
            max-height: 0;
            overflow: hidden;
            color: #7f8c8d;
            transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .model-card:hover .model-description {
            max-height: 500px; /* 根据实际内容调整 */
            margin-top: 1rem;
        }

        /* 模型特色标签 */
        .model-tag {
            position: absolute;
            top: -10px;
            right: -10px;
            background: var(--accent-color);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-size: 0.9rem;
            box-shadow: 0 3px 6px rgba(0,0,0,0.2);
        }

		/* 新增响应式适配 */
        @media (max-width: 768px) {
            .dropdown {
                height: auto;
                flex-direction: column;
                align-items: flex-start;
            }
            
            .dropdown-content {
                position: static;
                transform: none;
                width: 100%;
                box-shadow: none;
                border-left: 3px solid var(--primary-color);
                margin-top: 0.5rem;
            }
        }

        .gallery {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
            padding: 1rem;
        }

        .item {
            position: relative;
            overflow: hidden;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            aspect-ratio: 9/16;
            transition: transform 0.3s ease;
        }

        .item:hover {
            transform: translateY(-5px);
        }

        .item-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: opacity 0.3s ease;
        }

        .item:hover .item-img {
            opacity: 0.3;
        }

        .item-content {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 80%;
            text-align: center;
            color: white;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .item:hover .item-content {
            opacity: 1;
        }

        .item-title {
            font-size: 1.3rem;
            margin-bottom: 1rem;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }

        .item-desc {
            font-size: 0.95rem;
            line-height: 1.6;
            background: rgba(0,0,0,0.6);
            padding: 1rem;
            border-radius: 4px;
        }

        @media (max-width: 992px) {
            .gallery {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .gallery {
                grid-template-columns: 1fr;
            }
            
            .item {
                aspect-ratio: 3/2;
            }
        }