:root {
            --primary-color: #0a4a7a;
            --secondary-color: #e6a23c;
            --accent-color: #1a6fb3;
            --light-bg: #f8f9fa;
            --dark-text: #333333;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--dark-text);
            line-height: 1.6;
            overflow-x: hidden;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            padding: 15px 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .navbar-nav .nav-link {
            color: var(--dark-text);
            font-weight: 500;
            padding: 8px 15px;
            margin: 0 5px;
            border-radius: 4px;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: white;
            background-color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(10, 74, 122, 0.85), rgba(10, 74, 122, 0.9)), url('https://images.unsplash.com/photo-1621905252507-b35492cc74b4?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2069&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0 100px;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3rem;
            font-weight: 700;
            margin-bottom: 25px;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 35px;
            max-width: 700px;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 4px;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #d8922c;
            border-color: #d8922c;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .section-title {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 15px;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            background-color: white;
            border-radius: 8px;
            padding: 30px 25px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
            height: 100%;
            transition: var(--transition);
            border-top: 4px solid transparent;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
            border-top-color: var(--secondary-color);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .about-img {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        }
        .product-card {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            height: 100%;
            background-color: white;
        }
        .product-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
        }
        .product-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .product-body {
            padding: 25px;
        }
        .product-title {
            color: var(--primary-color);
            font-weight: 600;
            margin-bottom: 15px;
        }
        .case-study-item {
            position: relative;
            border-radius: 8px;
            overflow: hidden;
            margin-bottom: 30px;
            height: 350px;
        }
        .case-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .case-study-item:hover .case-img {
            transform: scale(1.05);
        }
        .case-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(10, 74, 122, 0.9));
            color: white;
            padding: 30px;
            transform: translateY(20px);
            opacity: 0;
            transition: var(--transition);
        }
        .case-study-item:hover .case-overlay {
            transform: translateY(0);
            opacity: 1;
        }
        .news-card {
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            height: 100%;
            background-color: white;
            transition: var(--transition);
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .news-date {
            background-color: var(--primary-color);
            color: white;
            padding: 10px 15px;
            font-weight: 600;
            display: inline-block;
            border-radius: 4px;
            margin-bottom: 15px;
        }
        .contact-info-box {
            background-color: var(--light-bg);
            border-radius: 8px;
            padding: 30px;
            height: 100%;
            border-left: 4px solid var(--primary-color);
        }
        .contact-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .contact-form {
            background-color: white;
            border-radius: 8px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
        }
        .form-control-custom {
            padding: 12px 15px;
            border-radius: 4px;
            border: 1px solid #ddd;
            transition: var(--transition);
        }
        .form-control-custom:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(10, 74, 122, 0.25);
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            background-color: var(--light-bg);
            border-radius: 4px;
            margin: 5px 10px 5px 0;
            color: var(--dark-text);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #e0e0e0;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .footer {
            background-color: #1a2a3a;
            color: #b0b7c3;
            padding: 60px 0 30px;
        }
        .footer-title {
            color: white;
            font-weight: 600;
            margin-bottom: 25px;
            font-size: 1.2rem;
        }
        .footer-links a {
            color: #b0b7c3;
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #2a3a4a;
            padding-top: 20px;
            margin-top: 40px;
            text-align: center;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--accent-color);
            color: white;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        .stat-item {
            text-align: center;
            padding: 30px 20px;
            border-radius: 8px;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0 60px;
                text-align: center;
            }
            .section-padding {
                padding: 50px 0;
            }
            .case-study-item {
                height: 250px;
            }
        }
        .section-padding {
            padding: 80px 0;
        }
        .bg-light-custom {
            background-color: var(--light-bg);
        }
        .process-step {
            position: relative;
            padding: 25px;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin-bottom: 30px;
            transition: var(--transition);
        }
        .process-step:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .step-number {
            position: absolute;
            top: -15px;
            left: 20px;
            width: 40px;
            height: 40px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }
        .certification-logo {
            height: 100px;
            object-fit: contain;
            filter: grayscale(100%);
            opacity: 0.7;
            transition: var(--transition);
        }
        .certification-logo:hover {
            filter: grayscale(0%);
            opacity: 1;
        }