:root {
            --primary: #0a4da2;
            --secondary: #ff6b00;
            --dark: #1a2b4d;
            --light: #f8f9fa;
            --gray: #6c757d;
        }

        body {
            font-family: 'Open Sans', sans-serif;
            color: #333;
            line-height: 1.6;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-family: 'Montserrat', sans-serif;
            font-weight: 600;
        }

        /* Header Top */
        .header-top {
            background-color: var(--dark);
            color: white;
            padding: 8px 0;
            font-size: 0.9rem;
        }

        .header-top a {
            color: white;
            text-decoration: none;
        }

        .header-top-right {
            text-align: right;
        }

        /* Navigation */
        .navbar {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            padding: 15px 0;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            padding: 0;
        }

        .navbar-brand img {
            height: 50px;
            width: auto;
        }

        .navbar-nav .nav-link {
            font-weight: 500;
            color: var(--dark);
            margin: 0 10px;
            transition: color 0.3s;
        }

        .navbar-nav .nav-link:hover {
            color: var(--secondary);
        }

        .dropdown-menu {
            border: none;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            padding: 10px 0;
        }

        .dropdown-item {
            padding: 8px 20px;
            transition: all 0.2s;
        }

        .dropdown-item:hover {
            background-color: #e1e5ed;
            color: var(--primary);
        }

        /* Banner Section with Carousel */
        .banner-section {
            position: relative;
            height: 500px;
            overflow: hidden;
        }

        .carousel-item {
            height: 500px;
            background-size: cover;
            background-position: center;
        }

        .carousel-item:nth-child(1) {
            background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://www.aipusolidcontrol.com/img/banner1.jpg');
        }

        .carousel-item:nth-child(2) {
            background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://www.aipusolidcontrol.com/img/banner2.jpg');
        }

        .carousel-item:nth-child(3) {
            background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://www.aipusolidcontrol.com/img/banner3.jpg');
        }

        .carousel-caption {
            top: 50%;
            transform: translateY(-50%);
            bottom: auto;
            text-align: center;
        }

        .carousel-caption h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .carousel-caption p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-primary {
            background-color: var(--secondary);
            border-color: var(--secondary);
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s;
        }

        .btn-primary:hover {
            background-color: #e55a00;
            border-color: #e55a00;
            transform: translateY(-2px);
        }

        .btn-outline-light {
            border-radius: 30px;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }

        .btn-outline-light:hover {
            transform: translateY(-2px);
        }

        .carousel-control-prev,
        .carousel-control-next {
            width: 50px;
            height: 50px;
            background-color: rgba(0, 0, 0, 0.3);
            border-radius: 50%;
            top: 50%;
            transform: translateY(-50%);
            opacity: 0.8;
        }

        .carousel-control-prev:hover,
        .carousel-control-next:hover {
            opacity: 1;
        }

        /* Section Styling */
        .section-padding {
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 60px;
        }

        .section-title h2 {
            color: var(--dark);
            font-size: 2.5rem;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-title h2:after {
            content: '';
            position: absolute;
            width: 70px;
            height: 4px;
            background: var(--secondary);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }

        .section-title p {
            color: var(--gray);
            max-width: 700px;
            margin: 0 auto;
        }

        /* Statistics Section Styles */
        .stats-section {
            background-color: var(--dark);
            /* 工业蓝色背景 */
            color: white;
            padding: 80px 0;
            position: relative;
            overflow: hidden;
        }

        .stats-section::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(rgba(26, 43, 77, 0.9), rgba(26, 43, 77, 0.9)),
                url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            z-index: -1;
        }

        .stat-item {
            padding: 20px;
            margin-bottom: 20px;
            text-align: center;
        }

        .stat-number {
            font-size: 4rem;
            font-weight: 700;
            color: white;
            line-height: 1;
            margin-bottom: 10px;
            font-family: 'Montserrat', sans-serif;
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
        }

        .stat-number+span {
            font-size: 3.5rem;
            font-weight: 700;
            color: var(--secondary);
            /* 使用橙色作为+号颜色，增加视觉吸引力 */
        }

        .stat-label {
            font-size: 1.3rem;
            color: white;
            font-weight: 500;
            margin-top: 10px;
        }

        .stats-description {
            margin-top: 50px;
            padding: 0 20px;
        }

        .stats-description p {
            font-size: 1.4rem;
            color: white;
            max-width: 900px;
            margin: 0 auto;
            line-height: 1.8;
            text-align: center;
            font-weight: 300;
        }

        /* Solutions Section */
        .solution-card {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            margin-bottom: 30px;
            overflow: hidden;
            height: 100%;
            border-top: 4px solid var(--primary);
        }

        .solution-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }

        .solution-img {
            height: 200px;
            overflow: hidden;
        }

        .solution-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .solution-card:hover .solution-img img {
            transform: scale(1.05);
        }

        .solution-content {
            padding: 25px;
        }

        .solution-content h4 {
            color: var(--dark);
            margin-bottom: 15px;
        }

        .solution-content p {
            color: var(--gray);
            margin-bottom: 20px;
        }

        /* Products Section */
        .products-section {
            background-color: #ffffff;
            position: relative;
        }

        .product-card {
            background: #ffffff;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            margin-bottom: 30px;
            overflow: hidden;
            height: 100%;
            border-top: 3px solid var(--primary);
            /* 顶部添加主题色边框 */
        }

        .product-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        .product-img {
            height: 200px;
            overflow: hidden;
        }

        .product-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .product-card:hover .product-img img {
            transform: scale(1.05);
        }

        .product-content {
            padding: 20px;
        }

        .product-content h5 {
            color: var(--dark);
            margin-bottom: 10px;
        }

        .product-content p {
            color: var(--gray);
            font-size: 0.9rem;
            margin-bottom: 15px;
        }

        /* Product Carousel */
        .product-carousel {
            position: relative;
        }

        .product-carousel .carousel-inner {
            padding: 20px 0;
        }

        .product-carousel .carousel-control-prev,
        .product-carousel .carousel-control-next {
            width: 40px;
            height: 40px;
            background-color: var(--primary);
            border-radius: 50%;
            top: 50%;
            transform: translateY(-50%);
            opacity: 0.9;
        }

        .product-carousel .carousel-control-prev {
            left: -20px;
        }

        .product-carousel .carousel-control-next {
            right: -20px;
        }

        .product-carousel .carousel-control-prev:hover,
        .product-carousel .carousel-control-next:hover {
            background-color: var(--secondary);
            opacity: 1;
        }

        /* About Section */
        .about-section {
            background-color: #f8f9fa;
        }

        .about-content {
            padding-right: 30px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            height: 100%;
        }

        .about-content h3 {
            color: var(--dark);
            margin-bottom: 10px;
        }

        .about-content h4 {
            color: var(--primary);
            margin-bottom: 20px;
            font-size: 1.5rem;
        }

        .about-content p {
            color: var(--gray);
            margin-bottom: 30px;
        }

        .about-img {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            height: 100%;
            display: flex;
            align-items: center;
        }

        .about-img img {
            width: 100%;
            height: auto;
            max-height: 350px;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .about-img:hover img {
            transform: scale(1.05);
        }

        /* Certifications Section */
        .certifications-section {
            background-color: #f8f9fa;
            padding: 60px 0;
            overflow: hidden;
        }

        .certifications-container {
            width: 100%;
            position: relative;
            overflow: hidden;
        }

        .certifications-track {
            display: flex;
            animation: scroll-certifications 40s linear infinite;
            width: max-content;
        }

        .certification-item {
            flex: 0 0 auto;
            width: 180px;
            margin: 0 15px;
            text-align: center;
        }

        .certification-img {
            background: white;
            border-radius: 8px;
            padding: 15px;
            height: 150px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }

        .certification-img:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        .certification-img img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
        }

        @keyframes scroll-certifications {
            0% {
                transform: translateX(0);
            }

            100% {
                transform: translateX(calc(-180px * 10 - 15px * 20));
            }
        }

        .certifications-container:hover .certifications-track {
            animation-play-state: paused;
        }

        /* Clients Section */
        .clients-section {
            background-color: #ffffff;
            padding: 60px 0;
        }

        .client-item {
            text-align: center;
            margin-bottom: 30px;
        }

        .client-img {
            background: white;
            border-radius: 8px;
            padding: 20px;
            height: 120px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            border: 1px solid #eaeaea;
        }

        .client-img:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        .client-img img {
            max-width: 100%;
            max-height: 100%;
            object-fit: contain;
            filter: grayscale(100%);
            transition: filter 0.3s;
        }

        .client-img:hover img {
            filter: grayscale(0%);
        }

        /* Applications Section */
        .application-card {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            margin-bottom: 30px;
            overflow: hidden;
        }

        .application-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        .application-img {
            height: 200px;
            overflow: hidden;
        }

        .application-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .application-card:hover .application-img img {
            transform: scale(1.05);
        }

        .application-content {
            padding: 20px;
        }

        .application-content h5 {
            color: var(--dark);
            margin-bottom: 10px;
        }

        /* News Section */
        .news-section {
            background-color: #f8f9fa;
        }

        .news-card {
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            margin-bottom: 30px;
            overflow: hidden;
            height: 100%;
        }

        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }

        .news-img {
            height: 200px;
            overflow: hidden;
        }

        .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .news-card:hover .news-img img {
            transform: scale(1.05);
        }

        .news-content {
            padding: 20px;
        }

        .news-content h5 {
            color: var(--dark);
            margin-bottom: 10px;
        }

        .news-content p {
            color: var(--gray);
            font-size: 0.9rem;
            margin-bottom: 15px;
        }

        .news-date {
            color: var(--secondary);
            font-size: 0.8rem;
            margin-bottom: 10px;
            display: block;
        }

        /* Footer */
        .footer {
            background: var(--dark);
            color: white;
            padding: 60px 0 20px;
        }

        .footer h5 {
            color: white;
            margin-bottom: 25px;
            font-weight: 600;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #b0b7c3;
            text-decoration: none;
            transition: color 0.3s;
        }

        .footer-links a:hover {
            color: white;
        }

        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
            color: white;
            transition: all 0.3s;
        }

        .social-icons a:hover {
            background: var(--secondary);
            transform: translateY(-3px);
        }

        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            color: #b0b7c3;
            font-size: 0.9rem;
        }

        /* Mobile Responsive */
        @media (max-width: 768px) {
            .header-top-right {
                text-align: left;
                margin-top: 10px;
            }

            .carousel-caption h1 {
                font-size: 2.5rem;
            }

            .carousel-caption p {
                font-size: 1rem;
            }

            .section-title h2 {
                font-size: 2rem;
            }

            .banner-section,
            .carousel-item {
                height: 400px;
            }

            .navbar-brand img {
                height: 40px;
            }

            .certification-item {
                width: 150px;
            }

            .product-carousel .carousel-control-prev,
            .product-carousel .carousel-control-next {
                display: none;
            }

            .about-content {
                padding-right: 0;
                margin-bottom: 30px;
            }

            .stat-number {
                font-size: 3rem;
            }

            .stat-number+span {
                font-size: 2.5rem;
            }

            .stat-label {
                font-size: 1.1rem;
            }

            .stats-description p {
                font-size: 1.1rem;
                padding: 0 15px;
            }
        }

        @media (max-width: 576px) {

            .banner-section,
            .carousel-item {
                height: 350px;
            }

            .carousel-caption h1 {
                font-size: 2rem;
            }

            .section-padding {
                padding: 60px 0;
            }

            .navbar-brand img {
                height: 35px;
            }

            .certification-item {
                width: 120px;
            }

            .stat-number {
                font-size: 2.5rem;
            }

            .stat-number+span {
                font-size: 2rem;
            }

            .stat-label {
                font-size: 1rem;
            }

            .stats-description p {
                font-size: 1rem;
            }
        }

        /* Mega Menu Styles */
        .mega-menu {
            padding: 20px !important;
        }

        .mega-menu .dropdown-item {
            padding: 8px 12px;
            border-radius: 4px;
            transition: all 0.3s;
        }

        .mega-menu .dropdown-item:hover {
            background-color: #f0f7ff;
            color: var(--primary);
        }

        .mega-menu .fa-check {
            color: var(--secondary);
            font-size: 0.8rem;
        }

        /* Mega Menu Styles */
        .mega-menu {
            padding: 20px !important;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            border: none;
        }

        .mega-menu .dropdown-item {
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s;
            margin-bottom: 2px;
            font-size: 0.9rem;
        }

        .mega-menu .dropdown-item:hover {
            background-color: #f0f7ff;
            color: var(--primary);
            transform: translateX(5px);
        }

        .mega-menu .fa-check {
            color: var(--secondary);
            font-size: 0.7rem;
        }

        /* 调整下拉菜单位置，防止超出屏幕 */
        @media (min-width: 992px) {
            .mega-menu {
                left: -100px !important;
            }
        }

        /* 在较小屏幕上调整位置 */
        @media (max-width: 1199px) {
            .mega-menu {
                left: -150px !important;
                min-width: 700px !important;
            }
        }

        /* 在移动设备上隐藏宽下拉菜单 */
        @media (max-width: 991px) {
            .mega-menu {
                width: 100% !important;
                min-width: auto !important;
                left: 0 !important;
            }

            .mega-menu .row {
                margin: 0;
            }

            .mega-menu .col-md-3 {
                margin-bottom: 15px;
            }
        }