/* 全局样式 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, sans-serif;
        }
        
        :root {
            --primary-color: #0066cc;
            --primary-dark: #004d99;
            --accent-color: #ff6600;
            --accent-dark: #e65c00;
            --light-color: #f5f5f5;
            --dark-color: #333;
            --gray-color: #666;
            --light-gray: #eee;
            --border-radius: 8px;
            --box-shadow: 0 6px 18px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s ease;
        }
        
        body {
            color: var(--dark-color);
            line-height: 1.6;
            background-color: #fff;
            overflow-x: hidden;
        }
        
        .container {
            width: 100%;
            max-width: 1600px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        section {
            padding: 70px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 38px;
            color: var(--primary-color);
            margin-bottom: 15px;
            font-weight: 800;
            letter-spacing: 1px;
        }
        
        .section-title p {
            font-size: 18px;
            color: var(--gray-color);
            max-width: 800px;
            margin: 0 auto;
            line-height: 1.8;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            width: 100px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            bottom: -25px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        
        .btn {
            display: inline-block;
            padding: 14px 32px;
            background: var(--primary-color);
            color: white;
            text-decoration: none;
            border-radius: var(--border-radius);
            font-weight: 700;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-align: center;
            font-size: 17px;
            letter-spacing: 1px;
            box-shadow: 0 4px 10px rgba(0, 102, 204, 0.3);
        }
        
        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }
        
        .btn-accent {
            background: var(--accent-color);
            box-shadow: 0 4px 10px rgba(255, 102, 0, 0.3);
        }
        
        .btn-accent:hover {
            background: var(--accent-dark);
        }
        
        /* 导航栏样式 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.98);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            z-index: 1000;
            transition: var(--transition);
            height: 80px;
            display: flex;
            align-items: center;
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .logo img {
            height: 60px;
        }
        
        .logo-text {
            font-size: 28px;
            font-weight: 800;
            color: var(--primary-color);
            text-transform: uppercase;
            letter-spacing: 1.5px;
        }
        
        .logo-text span {
            color: var(--accent-color);
            font-weight: 900;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
            position: relative;
        }
        
        .nav-links > li {
            margin: 0 18px;
            position: relative;
        }
        
        .nav-links a {
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 700;
            font-size: 17px;
            transition: var(--transition);
            padding: 12px 0;
            position: relative;
            display: block;
        }
        
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 8px;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--accent-color);
            transition: var(--transition);
        }
        /* 导航栏点击哪个当前这个就有颜色高亮 */
        .nav-links a:hover::after {
            width: 100%;
        }

        .nav-links li.active > a {
        color: #ff6600 !important;
        font-weight: bold;
        }
        /* 如果希望父级菜单有特殊样式 */
        .nav-links .has-submenu > a.active {
        color: #ff6600 !important;
        }
        
        /* 二级菜单 */
        .submenu {
            position: absolute;
            top: 100%;
            left: 0;
            width: 220px;
            background: white;
            box-shadow: var(--box-shadow);
            border-radius: var(--border-radius);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: var(--transition);
            z-index: 100;
            list-style: none;
        }
        
        .nav-links li:hover .submenu {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        
        .submenu li {
            padding: 0;
        }
        
        .submenu a {
            padding: 12px 18px;
            border-bottom: 1px solid #eee;
            font-size: 15px;
        }
        
        .submenu a:hover {
            background: var(--light-color);
        }
        
        .nav-contact {
            display: flex;
            align-items: center;
            font-weight: 700;
            font-size: 18px;
            color: var(--primary-color);
            background: rgba(0, 102, 204, 0.1);
            padding: 10px 22px;
            border-radius: 50px;
            transition: var(--transition);
        }
        
        .nav-contact:hover {
            background: rgba(0, 102, 204, 0.2);
            transform: translateY(-2px);
        }
        
        /* 优化汉堡菜单 */
        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 28px;
            width: 50px;
            height: 50px;
            text-align: center;
            line-height: 50px;
            border-radius: 50%;
            background: transparent;
            color: var(--dark-color);
            transition: var(--transition);
            position: relative;
            border: 2px solid var(--light-gray);
        }
        
        .hamburger:hover {
            background: var(--light-gray);
        }
        
        /* Banner 区域 */
        .banner {
            height: 90vh;
            min-height: 650px;
            position: relative;
            overflow: hidden;
            display: flex;
            align-items: center;
        }
        
        .banner img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: -1;
        }
        
        .banner-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, rgba(0,0,0,0.7), rgba(0,0,0,0.4));
            z-index: -1;
        }
        
        .banner-content {
            max-width: 100%;
            color: white;
            padding: 0 30px;
            animation: fadeInUp 1s ease;
        }
        
        .banner-content h1 {
            font-size: 54px;
            margin-bottom: 25px;
            line-height: 1.3;
            text-shadow: 0 2px 8px rgba(0,0,0,0.5);
            font-weight: 900;
            letter-spacing: 1px;
        }
        
        .banner-content p {
            font-size: 22px;
            margin-bottom: 35px;
            text-shadow: 0 1px 5px rgba(0,0,0,0.4);
            line-height: 1.7;
        }
        
        .banner-btns {
            display: flex;
            gap: 20px;
        }
        
        /* 解决方案区域 */
        .solutions {
            background: linear-gradient(to bottom, #f9fbfd, #edf2f7);
        }
        
        .solution-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr); /* 关键修改：固定3列等宽 */
            gap: 25px;
        }
        
        .solution-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .solution-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 25px rgba(0, 0, 0, 0.15);
        }
        
        .solution-img {
            height: 200px;
            overflow: hidden;
        }
        
        .solution-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .solution-card:hover .solution-img img {
            transform: scale(1.08);
        }
        
        .solution-content {
            padding: 22px;
        }
        
        .solution-content h3 {
            font-size: 22px;
            margin-bottom: 15px;
            color: var(--primary-color);
        }
        
        .solution-content p {
            margin-bottom: 18px;
            color: var(--gray-color);
            font-size: 16px;
            line-height: 1.7;
        }
        
        /* 产品展示区域 */
        .products {
            background: white;
            position: relative;
            overflow: hidden;
        }
        
        .product-tabs {
            display: flex;
            justify-content: center;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        
        .tab-btn {
            padding: 12px 30px;
            background: var(--light-color);
            border: none;
            border-radius: 50px;
            margin: 6px;
            cursor: pointer;
            font-weight: 700;
            transition: var(--transition);
            font-size: 16px;
        }
        
        .tab-btn.active, .tab-btn:hover {
            background: var(--primary-color);
            color: white;
        }
        
        .product-grid-container {
            position: relative;
            min-height: 100px;
        }
        
        .product-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
            opacity: 0;
            visibility: hidden;
            height: 0;
            overflow: hidden;
            transition: opacity 0.5s ease, height 0.5s ease;
        }
        
        .product-grid.active {
            opacity: 1;
            visibility: visible;
            height: auto;
            overflow: visible;
        }
        
        .product-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .product-card:hover {
            transform: translateY(-6px);
        }
        
        .product-img {
            height: 220px;
            overflow: hidden;
        }
        
        .product-img img {
            width: 100%;
            height: 100%;
            transition: var(--transition);
            object-fit: contain;
            padding: 10px;
        }
        
        .product-card:hover .product-img img {
            transform: scale(1.06);
        }
        
        .product-info {
            padding: 20px;
            text-align: center;
        }
        
        .product-info h3 {
            font-size: 20px;
            margin-bottom: 12px;
            color: var(--primary-color);
        }
        
        .product-info p {
            color: var(--gray-color);
            margin-bottom: 15px;
            font-size: 14px;
            line-height: 1.6;
        }
        
        /* 关于我们区域 */
        .about {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            position: relative;
            overflow: hidden;
        }
        
        .about-content {
            display: flex;
            align-items: center;
            gap: 40px;
        }
        
        .about-video {
            flex: 1;
            height: 400px;
            border-radius: var(--border-radius);
            overflow: hidden;
            position: relative;
            box-shadow: var(--box-shadow);
        }
        
        .about-video video {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        
        .video-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .video-overlay:hover {
            background: rgba(0, 0, 0, 0.4);
        }
        
        .play-btn {
            width: 80px;
            height: 80px;
            background: rgba(255, 255, 255, 0.8);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary-color);
            font-size: 36px;
            transition: var(--transition);
        }
        
        .video-overlay:hover .play-btn {
            background: var(--accent-color);
            color: white;
            transform: scale(1.1);
        }
        
        .about-text {
            flex: 1;
        }
        
        .about-text h3 {
            font-size: 30px;
            margin-bottom: 20px;
            line-height: 1.4;
        }
        
        .about-text p {
            margin-bottom: 20px;
            color: var(--gray-color);
            font-size: 16px;
            line-height: 1.8;
        }
        
        .stats {
            display: flex;
            justify-content: space-between;
            margin-top: 25px;
            flex-wrap: wrap;
        }
        
        .stat-item {
            text-align: center;
            min-width: 120px;
            margin-bottom: 15px;
        }
        
        .stat-item h4 {
            font-size: 36px;
            color: var(--accent-color);
            margin-bottom: 8px;
            font-weight: 800;
        }
        
        .stat-item p {
            font-size: 16px;
            color: var(--gray-color);
            margin: 0;
            font-weight: 600;
        }
        
        /* 案例展示区域 */
        .cases {
            background-color: white;
        }
        
        .case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
        }
        
        .case-card {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .case-card:hover {
            transform: scale(1.03);
        }
        
        .case-img {
            height: 200px;
            overflow: hidden;
        }
        
        .case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .case-card:hover .case-img img {
            transform: scale(1.1);
        }
        
        .case-content {
            padding: 20px;
            background: white;
        }
        
        .case-content h3 {
            font-size: 20px;
            margin-bottom: 12px;
            color: var(--primary-color);
        }
        
        .case-content p {
            color: var(--gray-color);
            margin-bottom: 15px;
            font-size: 14px;
            line-height: 1.6;
        }
        
        /* 新闻资讯区域 */
        .news {
            background: linear-gradient(to bottom, #f9fbfd, #edf2f7);
        }
        
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
        }
        
        .news-card {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }
        
        .news-card:hover {
            transform: translateY(-6px);
        }
        
        .news-img {
            height: 180px;
            overflow: hidden;
        }
        
        .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .news-card:hover .news-img img {
            transform: scale(1.06);
        }
        
        .news-content {
            padding: 20px;
        }
        
        .news-date {
            font-size: 14px;
            color: var(--accent-color);
            margin-bottom: 10px;
            font-weight: 600;
        }
        
        .news-content h3 {
            font-size: 18px;
            margin-bottom: 12px;
            color: var(--primary-color);
            line-height: 1.4;
        }
        
        .news-content p {
            color: var(--gray-color);
            margin-bottom: 15px;
            font-size: 14px;
            line-height: 1.7;
        }
        
        .news-more {
            display: inline-block;
            color: var(--primary-color);
            font-weight: 700;
            text-decoration: none;
            font-size: 14px;
            transition: var(--transition);
        }
        
        .news-more:hover {
            color: var(--accent-color);
            transform: translateX(5px);
        }
        
        /* 底部区域 */
        footer {
            background: linear-gradient(135deg, #222, #111);
            color: white;
            padding: 60px 0 55px;
            position: relative;
            overflow: hidden;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
            position: relative;
            z-index: 2;
        }
        
        .footer-column h3 {
            font-size: 22px;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background: var(--accent-color);
            border-radius: 2px;
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: #bbb;
            text-decoration: none;
            transition: var(--transition);
            font-size: 15px;
            display: inline-block;
        }
        
        .footer-links a:hover {
            color: white;
            transform: translateX(5px);
        }
        
        .contact-info {
            list-style: none;
        }
        
        .contact-info li {
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
        }
        
        .contact-info i {
            margin-right: 12px;
            color: var(--accent-color);
            min-width: 20px;
            font-size: 18px;
        }
        
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            color: #aaa;
            font-size: 14px;
            position: relative;
            z-index: 2;
        }
        
        /* 响应式设计 */
        @media (max-width: 1400px) {
            .solution-grid,
            .product-grid,
            .case-grid,
            .news-grid {
                grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            }
        }
        
        @media (max-width: 1100px) {
            .about-content {
                flex-direction: column;
            }
            
            .about-video, .about-text {
                width: 100%;
            }
            
            .about-video {
                height: 350px;
            }
        }
@media (max-width: 992px) {
            .hamburger {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            
            .nav-links {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background: white;
                flex-direction: column;
                align-items: center;
                transition: var(--transition);
                box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
                height: 100vh; /* 改为全屏高度 */
                max-height: 100vh; /* 限制最大高度 */
                overflow-y: auto; /* 允许纵向滚动 */
            }
            
            .nav-links.active {
                left: 0;
            }
            
            .nav-links li {
                margin: 0 0;
                width: 80%;
                text-align: center;
            }
            
            .nav-links a {
                font-size: 20px;
                padding: 15px 0;
                border-bottom: 1px solid #eee;
                width: 100%;
            }
            
            .nav-contact {
                display: none;
            }
            
            .submenu {
                position: static;
                width: 100%;
                box-shadow: none;
                opacity: 1;
                visibility: visible;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s ease;
                margin-top: 12px;
                background: rgba(0, 102, 204, 0.05);
                border-radius: 8px;
            }
            
            .nav-links li:hover .submenu {
                max-height: 0;
            }
            
            .nav-links li.active .submenu {
                max-height: 500px;
            }
            
            .banner-content h1 {
                font-size: 32px;
            }
            
            .banner-content p {
                font-size: 18px;
            }
            
            .section-title h2 {
                font-size: 28px;
            }
        }
        @media (max-width: 992px) {
  .nav-links {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%; /* 减少宽度避免遮挡 */
    height: 100vh;
    background: white;
    flex-direction: column;
    transition: transform 0.3s ease;
    box-shadow: 0 0 25px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
 
  .nav-links.active {
    transform: translateX(0);
  }
 
  .nav-links li {
    width: 100%;
  }
 
  .submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: rgba(0, 102, 204, 0.05);
    border-radius: 8px;
    margin: 8px 0;
  }
 
  .nav-links li.active .submenu {
    max-height: 500px;
  }
}
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            
            .nav-links {
                position: fixed;
                top: 80px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 80px);
                background: white;
                flex-direction: column;
                align-items: center;
                transition: var(--transition);
                box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
                height: 100vh; /* 改为全屏高度 */
                max-height: 100vh; /* 限制最大高度 */
                overflow-y: auto; /* 允许纵向滚动 */
            }
            
            .nav-links.active {
                left: 0;
            }
            
            .nav-links li {
                margin: 0 0;
                width: 80%;
                text-align: center;
            }
            
            .nav-links a {
                font-size: 20px;
                padding: 15px 0;
                border-bottom: 1px solid #eee;
                width: 100%;
            }
            
            .nav-contact {
                display: none;
            }
            
            .submenu {
                position: static;
                width: 100%;
                box-shadow: none;
                opacity: 1;
                visibility: visible;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.3s ease;
                margin-top: 12px;
                background: rgba(0, 102, 204, 0.05);
                border-radius: 8px;
            }
            
            .nav-links li:hover .submenu {
                max-height: 0;
            }
            
            .nav-links li.active .submenu {
                max-height: 500px;
            }
            
            .banner-content h1 {
                font-size: 32px;
            }
            
            .banner-content p {
                font-size: 18px;
            }
            
            .section-title h2 {
                font-size: 28px;
            }
        }
        @media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%; /* 减少宽度避免遮挡 */
    height: 100vh;
    background: white;
    flex-direction: column;
    transition: transform 0.3s ease;
    box-shadow: 0 0 25px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
 
  .nav-links.active {
    transform: translateX(0);
  }
 
  .nav-links li {
    width: 100%;
  }
 
  .submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: rgba(0, 102, 204, 0.05);
    border-radius: 8px;
    margin: 8px 0;
  }
 
  .nav-links li.active .submenu {
    max-height: 500px;
  }
}
        @media (max-width: 576px) {
            .banner-content h1 {
                font-size: 26px;
            }
            
            .banner-btns {
                flex-direction: column;
                gap: 12px;
            }
            
            .logo-text {
                font-size: 22px;
            }
            
            .logo img {
                height: 50px;
            }
            
            section {
                padding: 50px 0;
            }
            
            .section-title {
                margin-bottom: 40px;
            }
        }
        
        /* 动画 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes slideInUp {
            from {
                transform: translateY(100px);
                opacity: 0;
            }
            to {
                transform: translateY(0);
                opacity: 1;
            }
        }
        
        @keyframes slideOutDown {
            from {
                transform: translateY(0);
                opacity: 1;
            }
            to {
                transform: translateY(100px);
                opacity: 0;
            }
        }
        
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }