:root {
            --primary-color: #1a5f7a;
            --secondary-color: #57cc99;
            --accent-color: #ff9a3c;
            --dark-color: #2d3748;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--dark-color);
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 8px;
            transition: all 0.3s;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 50%;
            background-color: var(--secondary-color);
            transition: all 0.3s ease;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 80%;
            left: 10%;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 95, 122, 0.85), rgba(26, 95, 122, 0.9)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2070&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 180px 0 120px;
            margin-top: 76px;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.4rem;
            margin-bottom: 2rem;
            max-width: 700px;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            text-align: center;
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.4s, box-shadow 0.4s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1) !important;
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .card:hover .card-img-top {
            transform: scale(1.05);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .stats-section {
            background: linear-gradient(135deg, var(--primary-color), #2a7a9c);
            color: white;
            padding: 80px 0;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .stat-label {
            font-size: 1.2rem;
            opacity: 0.9;
        }
        .project-card {
            position: relative;
            overflow: hidden;
            border-radius: 12px;
            margin-bottom: 30px;
        }
        .project-overlay {
            position: absolute;
            bottom: -100%;
            left: 0;
            width: 100%;
            background: rgba(26, 95, 122, 0.9);
            color: white;
            padding: 25px;
            transition: bottom 0.5s ease;
        }
        .project-card:hover .project-overlay {
            bottom: 0;
        }
        .news-card {
            border-left: 4px solid var(--secondary-color);
            transition: all 0.3s;
        }
        .news-card:hover {
            background-color: rgba(87, 204, 153, 0.05);
            transform: translateX(5px);
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            margin-bottom: 25px;
        }
        .contact-icon {
            background-color: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            margin-right: 15px;
            flex-shrink: 0;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 8px;
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 500;
            border: 1px solid #e9ecef;
            transition: all 0.3s;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            border-color: var(--primary-color);
        }
        footer {
            background-color: var(--dark-color);
            color: #dee2e6;
            padding-top: 60px;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-links h5::after {
            content: '';
            position: absolute;
            width: 40px;
            height: 3px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
        }
        .footer-links a {
            color: #adb5bd;
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .copyright {
            background-color: rgba(0,0,0,0.2);
            padding: 20px 0;
            margin-top: 40px;
            font-size: 0.9rem;
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: #14475c;
            border-color: #14475c;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .btn-secondary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: white;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-secondary-custom:hover {
            background-color: #3db583;
            border-color: #3db583;
            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(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            z-index: 999;
            opacity: 0;
            transition: all 0.3s;
        }
        .back-to-top.visible {
            opacity: 1;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }