:root {
            --primary-color: #0a3d62;
            --secondary-color: #079992;
            --accent-color: #f6b93b;
            --light-color: #f8f9fa;
            --dark-color: #2c3e50;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.8;
            color: #333;
        }
        h1, h2, h3, h4, h5 {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
            padding: 1rem 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            color: var(--dark-color) !important;
            font-weight: 600;
            margin: 0 0.5rem;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(10, 61, 98, 0.85), rgba(7, 153, 146, 0.8)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .section-padding {
            padding: 5rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-box {
            background: white;
            padding: 2.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 25px rgba(0, 0, 0, 0.08);
            height: 100%;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .feature-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        .feature-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .service-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s;
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
        }
        .service-img {
            height: 220px;
            object-fit: cover;
        }
        .card-body {
            padding: 2rem;
        }
        .project-card {
            position: relative;
            overflow: hidden;
            border-radius: 10px;
            margin-bottom: 2rem;
        }
        .project-card img {
            transition: transform 0.5s;
            height: 300px;
            object-fit: cover;
            width: 100%;
        }
        .project-card:hover img {
            transform: scale(1.05);
        }
        .project-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(10, 61, 98, 0.9), transparent);
            color: white;
            padding: 2rem;
            transform: translateY(100%);
            transition: transform 0.5s;
        }
        .project-card:hover .project-overlay {
            transform: translateY(0);
        }
        .stat-box {
            text-align: center;
            padding: 2rem;
            background-color: var(--light-color);
            border-radius: 10px;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            display: block;
            line-height: 1;
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: filter 0.3s, opacity 0.3s;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .contact-info-box {
            background-color: var(--light-color);
            padding: 2.5rem;
            border-radius: 10px;
            height: 100%;
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .footer {
            background-color: var(--dark-color);
            color: white;
            padding: 4rem 0 2rem;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links ul {
            padding-left: 0;
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--secondary-color);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 2rem;
            margin-top: 3rem;
            text-align: center;
            color: #aaa;
            font-size: 0.9rem;
        }
        .flink {
            display: inline-block;
            margin: 0.5rem 1rem;
            color: var(--secondary-color);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }
        .flink:hover {
            color: var(--accent-color);
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 0.8rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .btn-secondary-custom {
            background-color: transparent;
            border-color: white;
            color: white;
            padding: 0.8rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-secondary-custom:hover {
            background-color: white;
            color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.2rem;
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s, transform 0.3s;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .back-to-top:hover {
            background-color: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
            .feature-box, .contact-info-box {
                padding: 1.5rem;
            }
            .navbar-nav {
                background-color: white;
                padding: 1rem;
                border-radius: 10px;
                box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            }
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background-color: var(--secondary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -2.2rem;
            top: 0.5rem;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background-color: var(--secondary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--secondary-color);
        }
        .news-card {
            border: 1px solid #eee;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        .news-date {
            background-color: var(--secondary-color);
            color: white;
            padding: 0.5rem 1rem;
            display: inline-block;
            border-radius: 5px;
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .award-badge {
            display: inline-block;
            background-color: var(--light-color);
            padding: 0.5rem 1.5rem;
            border-radius: 50px;
            margin: 0.5rem;
            font-weight: 500;
            border-left: 4px solid var(--secondary-color);
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-photo {
            width: 180px;
            height: 180px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 1.5rem;
            border: 5px solid var(--light-color);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        .process-step {
            text-align: center;
            padding: 2rem;
            position: relative;
        }
        .process-number {
            display: inline-block;
            width: 60px;
            height: 60px;
            background-color: var(--secondary-color);
            color: white;
            border-radius: 50%;
            line-height: 60px;
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
        }
        .quote {
            font-size: 1.2rem;
            font-style: italic;
            color: var(--dark-color);
            border-left: 4px solid var(--secondary-color);
            padding-left: 1.5rem;
            margin: 2rem 0;
        }
        .map-container {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
            height: 100%;
            min-height: 400px;
        }
        .form-control-custom {
            padding: 0.8rem 1rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            transition: border-color 0.3s, box-shadow 0.3s;
        }
        .form-control-custom:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(7, 153, 146, 0.25);
        }