/* 基础重置与字体 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: linear-gradient(145deg, #f5f7fc 0%, #eef2f6 100%);
            min-height: 100vh;
        }

        /* 模拟页面内容区域，方便查看滚动效果及视觉层次 */
        .hero {
            text-align: left;
            padding: 1.5rem 1.5rem;
            background: rgba(255,255,255,0.6);
            backdrop-filter: blur(2px);

            max-width: 1280px;
            margin: 0 1.5rem;

            border-radius: 2rem;
            box-shadow: 0 10px 25px -5px rgba(0,0,0,0.05);
        }

        .hero h1 {
            font-size: clamp(1.8rem, 6vw, 3rem);
            font-weight: 700;
            background: linear-gradient(135deg, #1e2a3e, #2c3e50);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 1rem;
            text-align: center;
        }

        .hero p {
            max-width: 1280px;
            margin: 0 1.5rem;
            color: #2c3e50;
            font-size: 1.1rem;
            line-height: 1.5;
        }

        .content-section {
            max-width: 1200px;
            margin: 3rem auto;
            padding: 0 1.5rem;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
        }

        .card {
            background: white;
            border-radius: 1.5rem;
            padding: 1.8rem;
            box-shadow: 0 20px 35px -12px rgba(0,0,0,0.1);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 25px 40px -14px rgba(0,0,0,0.15);
        }

        .card h3 {
            font-size: 1.5rem;
            margin-bottom: 0.75rem;
            color: #1e293b;
        }

        .card p {
            color: #475569;
            line-height: 1.5;
        }



 /* 按钮通用 */
        .btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            text-align: center;
            cursor: pointer;
            border: none;
            font-size: 0.95rem;
        }

        .btn-primary {
            background: #1e4a6b;
            color: white;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        }

        .btn-primary:hover {
            background: #0f3a55;
            transform: translateY(-2px);
            box-shadow: 0 12px 20px -8px rgba(30,74,107,0.3);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid #1e4a6b;
            color: #1e4a6b;
        }

        .btn-outline:hover {
            background: #1e4a6b;
            color: white;
            transform: translateY(-2px);
        }


 /* 产品展示区 */
        .section-title {
            text-align: center;
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 2rem;
            color: #0f2b3d;
        }
        .section-sub {
            text-align: center;
            color: #5b6e8c;
            max-width: 700px;
            margin: -0.5rem auto 3rem auto;
        }
        .products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        .product-card {
            background: white;
            border-radius: 28px;
            overflow: hidden;
            box-shadow: 0 8px 24px rgba(0,0,0,0.05);
            transition: all 0.25s ease;
            border: 1px solid #eef2f8;
        }
        .product-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 35px -12px rgba(0,0,0,0.15);
        }
        .product-img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            background: #eef2fa;
        }
        .product-info {
            padding: 1.5rem;
        }
        .product-title {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .product-spec {
            color: #5c6f87;
            font-size: 0.85rem;
            margin: 0.5rem 0;
        }
        .product-price {
            font-weight: 700;
            color: #1e4a6b;
            margin-top: 0.8rem;
        }
        .inq-link {
            display: inline-block;
            margin-top: 1rem;
            font-weight: 600;
            color: #1e4a6b;
            text-decoration: none;
        }

/* 联系表单 */
        .contact-section {
            padding: 70px 0;
            max-width: 1280px;
            margin: 0 1.5rem;
        }
        .contact-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 3rem;
            background: white;
            border-radius: 36px;
            box-shadow: 0 12px 30px rgba(0,0,0,0.05);
            padding: 2rem;
        }
        .contact-info {
            flex: 1;
            background: black;
            border-radius: 28px;
            padding: 2rem;
            color: white;
        }
        .contact-info h3 {
            font-size: 1.7rem;
            margin-bottom: 1rem;
        }
        .contact-detail {
            margin: 2rem 0;
        }
        .contact-detail p {
            margin: 1rem 0;
            display: flex;
            gap: 12px;
            align-items: center;
        }
        .contact-form {
            flex: 1.5;
            padding: 0.5rem;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px 18px;
            border-radius: 28px;
            border: 1px solid #d1d9e8;
            font-family: inherit;
            transition: 0.2s;
        }
        textarea {
            border-radius: 24px;
            resize: vertical;
        }
        input:focus, textarea:focus {
            outline: none;
            border-color: #1e4a6b;
            box-shadow: 0 0 0 2px rgba(30,74,107,0.2);
        }

 footer {
            background: black;
            color: #cbd5e6;
            padding: 40px 0 20px;
            text-align: center;
            max-width: 1280px;
            margin: 0 1.5rem;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            margin: 1rem 0;
        }
        .footer-links a {
            color: #cbd5e6;
            text-decoration: none;
        }
        .social-icons a {
            color: white;
            margin: 0 10px;
            font-size: 1.3rem;
        }


/* 图片轮播展示区 */
#image-slider {
    position: relative; /* 确保容器是相对定位 */
    max-width: 1280px;
    margin: 0 1.5rem;
    height: 320px; /* 容器高度 */
    overflow: hidden; /* 隐藏超出容器的部分 */
}
#image-slider img {
    position: absolute; /* 绝对定位 */
    width: 100%; /* 图片宽度 */
    height: 100%; /* 图片高度 */
    left: 0; /* 图片初始位置 */
    top: 0; /* 图片初始位置 */
    opacity: 0; /* 初始透明度为0 */
    animation: slideShow 6s infinite; /* 应用动画 */
}
@keyframes slideShow {
    0%, 100% { opacity: 0; } /* 开始和结束时透明度为0 */
    16.66%, 83.33% { opacity: 1; } /* 中间时刻透明度为1 */
}
#image-slider img:nth-child(1) { animation-delay: 0s; } /* 第一张图片无延迟 */
#image-slider img:nth-child(2) { animation-delay: 3s; } /* 第二张图片有3秒延迟 */
#image-slider img:nth-child(3) { animation-delay: 6s; } /* 第二张图片有6秒延迟 */


        /* ========= 导航栏核心样式 ========= */
        .navbar {
            background: rgba(255, 255, 255, 0.96);
            max-width: 1280px;
            margin: 0 1.5rem;
            backdrop-filter: blur(8px);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid rgba(0, 0, 0, 0.05);
        }

        .nav-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0.5rem 0rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }

        /* Logo / 品牌区域 */
        .logo {
            font-size: 1.65rem;
            font-weight: 700;
            letter-spacing: -0.3px;
            background: linear-gradient(130deg, #0f2b3d, #1b4f72);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: opacity 0.2s;
        }

        .logo span {
            background: none;
            color: #1f6392;
            font-size: 1.7rem;
        }

        /* 桌面端菜单 (默认) */
        .nav-menu {
            width: 100%;
            display: flex;
            justify-content: flex-end;
            align-items: center;
            gap: 1rem;
            list-style: none;
            transition: all 0.3s ease;
        }

        .nav-item {
            margin: 0;
        }

        .nav-link {
            display: inline-block;
            padding: 0.6rem 1.2rem;
            font-weight: 500;
            color: white;
            text-decoration: none;
            border-radius: 60px;
            transition: all 0.2s ease;
            font-size: 1rem;
        }

        .nav-link:hover {
            background: #1f6392;
            transform: translateY(-1px);
        }

        /* 特殊高亮按钮（联系 / CTA） */
        .nav-link.contact-btn {
            background: #66CCFF;
            color: white;
            padding: 0.6rem 1.4rem;
            margin-left: 0.25rem;
            box-shadow: 0 2px 6px rgba(0,0,0,0.05);
        }

        .nav-link.contact-btn:hover {
            background: #0e4a6e;
            transform: translateY(-2px);
            box-shadow: 0 8px 18px rgba(31,99,146,0.2);
        }

        /* 移动端 汉堡按钮 (默认隐藏) */
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            background: transparent;
            border: none;
            padding: 0.5rem;
            border-radius: 0.5rem;
            transition: background 0.2s;
        }

        .hamburger:hover {
            background: rgba(0, 0, 0, 0.05);
        }

        .bar {
            width: 26px;
            height: 2.5px;
            background-color: #1e2f3f;
            margin: 4px 0;
            transition: all 0.3s ease;
            border-radius: 4px;
        }

        /* 响应式断点: 当屏幕宽度小于 768px 时，折叠菜单 */
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }

            .nav-menu {
                position: fixed;
                background-color: black;
                left: -100%;
                top: 70px;
                flex-direction: column;
                backdrop-filter: blur(16px);
                width: 80%;
                max-width: 320px;
                height: calc(100vh - 70px);
                padding: 2rem 1.5rem;
                gap: 1.5rem;
                box-shadow: 2px 0 25px rgba(0, 0, 0, 0.1);
                transition: left 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
                z-index: 999;
                border-right: 1px solid rgba(0,0,0,0.05);
                align-items: flex-start;
                overflow-y: auto;
            }

            /* 菜单激活时滑入 */
            .nav-menu.active {
                left: 0;
            }

            .nav-link {
                width: 100%;
                color: white;
                padding: 0.75rem 1rem;
                font-size: 1.1rem;
            }

            .nav-link.contact-btn {
                margin-left: 0;
                text-align: center;
                justify-content: center;
                display: inline-block;
                width: auto;
                padding: 0.75rem 1.8rem;
            }

            /* 避免内容被菜单遮罩，增加一个半透明遮罩层 (可选, 增强体验) */
            .menu-overlay {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background: rgba(0, 0, 0, 0.3);
                backdrop-filter: blur(2px);
                z-index: 998;
                visibility: hidden;
                opacity: 0;
                transition: visibility 0.2s, opacity 0.2s;
            }

            .menu-overlay.active {
                visibility: visible;
                opacity: 1;
            }
        }

        /* 桌面端保持原样，没有任何额外遮罩问题 */
        @media (min-width: 769px) {
            .menu-overlay {
                display: none;
            }
        }

        /* 小细节: 当菜单打开时，禁止body滚动（可选，防止背景滚动） */
        body.menu-open {
            overflow: hidden;
        }

        /* 辅助一些平滑滚动效果 */
        html {
            scroll-behavior: smooth;
        }