* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
        }

        body {
            background-color: #f5f5f7;
        }

        //* 导航容器 */
        .nav-container {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.8);
            -webkit-backdrop-filter: blur(20px); /* Safari 支持 */
            backdrop-filter: blur(20px); /* 标准支持 */
            z-index: 1000;
            border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        }

        /* 导航主体 */
        .nav-wrapper {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 主导航栏 */
        .main-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 60px;
        }

        /* 新增内容区域样式 */
        .content-wrapper {
            max-width: 1200px;
            margin: 80px auto 0;
            padding: 40px 20px;
        }

        .hero-section {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 80vh;
            text-align: center;
            padding: 0 20px;
        }

        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            background: linear-gradient(90deg, #0071e3, #2997ff);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .hero-text {
            font-size: 1.5rem;
            color: #86868b;
            max-width: 800px;
            line-height: 1.6;
            margin-bottom: 40px;
        }

        /* 卡片式布局 */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 60px 0;
        }

        .card {
            background: white;
            border-radius: 18px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
        }

        .card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .card-content {
            padding: 25px;
        }

        .card-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .card-text {
            color: #86868b;
            line-height: 1.6;
        }

        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .fade-in {
            animation: fadeIn 0.8s ease forwards;
        }

        .delay-1 { animation-delay: 0.2s; }
        .delay-2 { animation-delay: 0.4s; }
        .delay-3 { animation-delay: 0.6s; }

        .logo {
            font-size: 24px;
            font-weight: 600;
            color: #000;
            text-decoration: none;
        }

        /* 导航菜单 */
        .nav-menu {
            display: flex;
            list-style: none;
            height: 100%;
        }

        .nav-item {
            position: relative;
            padding: 0 20px;
            height: 100%;
            display: flex;
            align-items: center;
        }

        .nav-link {
            text-decoration: none;
            color: #666;
            font-size: 14px;
            transition: color 0.3s;
            position: relative;
        }

        .nav-link:hover {
            color: #000;
        }

        /* 横向下拉菜单 */
        .dropdown-horizontal {
            position: absolute;
            top: 100%;
            left: 0;
            width: 200vw;
            margin-left: -100vw;
            left: 50%;
            background: rgba(255,255,255,0.92);
            -webkit-backdrop-filter: blur(30px); /* Safari 支持 */
            backdrop-filter: blur(30px); /* 标准支持 */
            display: none;
            padding: 40px 0;
            box-shadow: 0 20px 30px rgba(0,0,0,0.1);
            border-top: 1px solid rgba(0,0,0,0.1);
        }

        .dropdown-content {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            padding: 0 20px;
        }

        .menu-section h3 {
            font-size: 12px;
            color: #666;
            margin-bottom: 15px;
            font-weight: 500;
            text-transform: uppercase;
        }

        .menu-section ul {
            list-style: none;
        }

        .menu-section li {
            margin-bottom: 12px;
        }

        .menu-section a {
            color: #000;
            text-decoration: none;
            font-size: 16px;
            transition: opacity 0.3s;
        }

        .menu-section a:hover {
            opacity: 0.7;
        }

        /* 交互效果 */
        .nav-item:hover .dropdown-horizontal {
            display: block;
            animation: menuSlide 0.3s cubic-bezier(0.23, 1, 0.32, 1);
        }

        @keyframes menuSlide {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* 主内容区 */
        main {
            margin-top: 80px;
            padding: 40px 5%;
        }

        .hero-section {
            text-align: center;
            margin-bottom: 80px;
        }

        .hero-title {
            font-size: 56px;
            color: #1d1d1f;
            margin-bottom: 20px;
            font-weight: 600;
            background: linear-gradient(90deg, #1d1d1f, #424245);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .category-grid {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 100px;
            max-width: 1200px;
            margin: 0 auto;
            min-height: 60vh; /* 上下居中 */
        }

        .category-card {
            background: #fff;
            border-radius: 28px;
            padding: 70px 60px;
            min-width: 400px;
            min-height: 320px;
            transition: transform 0.3s, box-shadow 0.3s;
            cursor: pointer;
            border: 1px solid rgba(0, 0, 0, 0.05);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

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

        .category-icon {
            width: 60px;
            height: 60px;
            background: #f5f5f7;
            border-radius: 14px;
            margin-bottom: 25px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: #1d1d1f;
        }

        .category-title {
            font-size: 24px;
            color: #1d1d1f;
            margin-bottom: 15px;
            font-weight: 500;
        }

        .category-count {
            color: #86868b;
            font-size: 16px;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            main {
        margin-top: 24px;
        padding: 20px 5% 32px;
    }

            .hero-title {
                font-size: 40px;
            }
            
            .nav-links {
                display: none;
            }
            
            .category-grid {
        flex-direction: column;
        gap: 24px;
        align-items: center;
        min-height: calc(100svh - 180px);
        justify-content: center;
        width: 100%;
        margin: 0 auto;
        display: flex;
        padding: 8px 0 0;
        transform: none;
    }
    .category-card {
        min-width: 0;
        width: 90vw;
        max-width: 340px;
        min-height: 140px;
        padding: 28px 10px;
        border-radius: 16px;
        margin-left: auto;
        margin-right: auto;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    .category-icon {
        width: 40px;
        height: 40px;
        font-size: 22px;
        margin-bottom: 12px;
        border-radius: 8px;
    }
    .category-title {
        font-size: 1.1rem;
        margin-bottom: 8px;
    }
    .category-count {
        font-size: 0.92rem;
    }
        }
        /* 移动端样式 */
        @media (min-width: 769px) {
            /* PC端时隐藏移动端导航 */
            .mobile-header,
            .mobile-menu {
                display: none !important;
            }
            
            /* PC端时显示主导航 */
            .nav-container {
                display: block;
            }
        }

        @media (max-width: 768px) {
            /* 移动端时隐藏PC导航 */
            .nav-container {
                display: none !important;
            }
            
            /* 移动端时显示移动导航 */
            .mobile-header {
                display: flex !important;
            }

            .equipment-image-container {
        gap: 0.5rem; /* 缩小图片间距 */
    }
    .equipment-image {
        height: 90px;   /* 移动端图片高度更小 */
        max-width: 120px; /* 限制最大宽度 */
    }
        }
        @media (max-width: 600px) {
            .nav-container {
                display: none; /* 隐藏桌面导航 */
            }

            .mobile-header {
                display: flex;
                justify-content: space-between;
                align-items: center;
                padding: 10px 20px;
                background: rgba(255, 255, 255, 0.9);
                border-bottom: 1px solid rgba(0, 0, 0, 0.1);
                position: relative;
                z-index: 1001;
            }

            .mobile-logo {
                font-size: 18px;
                font-weight: 600;
                color: #000;
                text-decoration: none;
            }

            .mobile-logo-en {
                font-size: 8px !important;
                color: #444;
                margin-top: 2px;
                letter-spacing: 1px;
                font-weight: 400;
                white-space: nowrap;
                line-height: 1;
                text-overflow: ellipsis;
                overflow: hidden;
                max-width: 100vw;
            }

            @media (max-width: 768px) {
            .main-nav, .nav-menu, .nav-login {
                display: none !important;
            }
            .mobile-header {
                display: flex;
                align-items: center;
                justify-content: space-between;
                height: 60px;
                padding: 0 16px;
                background: rgba(255,255,255,0.95);
                position: fixed;
                top: 0;
                left: 0;
                width: 100vw;
                z-index: 1200;
                border-bottom: 1px solid #eee;
            }
            .mobile-logo {
                font-size: 16px;
                font-weight: 600;
                color: #222;
                text-decoration: none;
                flex: 1;
                white-space: nowrap;
                overflow: hidden;
                text-overflow: ellipsis;
            }
            .mobile-menu-btn {
                background: none;
                border: none;
                font-size: 28px;
                color: #222;
                cursor: pointer;
                padding: 8px;
            }
            .mobile-menu {
                display: none;
                position: fixed;
                top: 0;
                left: 0;
                width: 100vw;
                height: 100vh;
                background: #222;
                color: #fff;
                z-index: 2000;
                flex-direction: column;
                padding-top: 60px;
                transition: transform 0.3s cubic-bezier(.4,0,.2,1);
                overflow-y: auto; /* 允许菜单内容滚动 */
                -webkit-overflow-scrolling: touch; /* iOS 惯性滚动 */
            }
            .mobile-menu.active {
                display: flex;
            }
            body.mobile-menu-open {
                overflow: hidden;
                position: fixed;
                width: 100vw;
            }
            .mobile-menu-close {
                position: absolute;
                top: 16px;
                right: 20px;
                background: none;
                border: none;
                color: #fff;
                font-size: 28px;
                cursor: pointer;
                z-index: 2100;
            }
            .mobile-menu-list {
                list-style: none;
                padding: 0;
                margin: 0;
                width: 100%;
            }
            .mobile-menu-list li {
                border-bottom: 1px solid rgba(255,255,255,0.08);
            }
            .mobile-menu-link {
                display: block;
                color: #fff;
                text-decoration: none;
                font-size: 18px;
                padding: 18px 28px;
                width: 100%;
                transition: background 0.2s;
            }
            .mobile-menu-link:hover {
                background: rgba(255,255,255,0.08);
            }
            .mobile-menu-dropdown {
                background: #222;
                padding-left: 32px;
            }
            .mobile-menu-dropdown a {
                color: #fff;
                font-size: 16px;
                display: block;
                padding: 12px 0;
                text-decoration: none;
            }
            .mobile-menu-dropdown a:hover {
                text-decoration: underline;
            }
            body.mobile-menu-open {
                overflow: hidden;
            }
            .carousel-container {
                margin-top: 60px !important;
            }
            .carousel-caption {
                position: absolute;
                left: 0;
                right: 0;
                bottom: 0;
                width: 100%;
                max-width: 100%;
                padding: 0.7rem 0.7rem 0.9rem 0.7rem;
                background: rgba(0,0,0,0.32);
                text-align: left;
                color: #fff;
                animation: fadeIn 1.5s ease-in-out;
            }
            .carousel-caption h2 {
                font-size: 1.15rem;
                margin-bottom: 0.5rem;
                font-weight: 700;
                color: #fff;
                text-shadow: 0 2px 6px rgba(0,0,0,0.25);
                line-height: 1.3;
            }
            .carousel-caption p {
                font-size: 0.92rem;
                margin-bottom: 0.7rem;
                line-height: 1.5;
                color: #fff;
                text-shadow: 0 1px 3px rgba(0,0,0,0.18);
            }
            .read-more {
                padding: 7px 14px;
                font-size: 0.92rem;
            }
        }