:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --accent-color: #28a745;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --text-color: #333;
            --border-radius: 8px;
            --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
            color: var(--text-color);
            line-height: 1.8;
            overflow-x: hidden;
            padding-top: 76px;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--dark-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            border-radius: 2px;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .navbar {
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            background-color: rgba(255, 255, 255, 0.98) !important;
            backdrop-filter: blur(10px);
            transition: var(--transition);
        }
        .nav-link {
            font-weight: 600;
            margin: 0 5px;
            transition: var(--transition);
            border-radius: var(--border-radius);
        }
        .nav-link:hover, .nav-link.active {
            background-color: rgba(0, 86, 179, 0.1);
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(0, 86, 179, 0.9) 0%, rgba(23, 162, 184, 0.85) 100%), url('https://images.unsplash.com/photo-1519389950473-47ba0277781c?ixlib=rb-4.0.3&auto=format&fit=crop&w=1770&q=80') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 100px 0;
            position: relative;
        }
        .hero-content h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 1.5rem;
        }
        @media (max-width: 768px) {
            .hero-content h1 {
                font-size: 2.5rem;
            }
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }
        .feature-card, .service-card, .project-card {
            border: none;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            transition: var(--transition);
            height: 100%;
            overflow: hidden;
        }
        .feature-card:hover, .service-card:hover, .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .service-card .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .stats-section {
            background-color: var(--dark-color);
            color: white;
            padding: 80px 0;
        }
        .stat-item h3 {
            font-size: 3rem;
            color: white;
            margin-bottom: 0;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
            margin-left: 20px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
        }
        .timeline-item {
            position: relative;
            margin-bottom: 40px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background-color: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }
        .contact-info-item {
            display: flex;
            align-items: center;
            margin-bottom: 25px;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background-color: rgba(0, 86, 179, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: var(--primary-color);
            font-size: 1.3rem;
        }
        footer {
            background-color: var(--dark-color);
            color: #aaa;
            padding-top: 60px;
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .flink {
            display: inline-block;
            background-color: rgba(255, 255, 255, 0.05);
            padding: 8px 15px;
            margin: 5px;
            border-radius: 4px;
            transition: var(--transition);
            color: #aaa;
        }
        .flink:hover {
            background-color: rgba(255, 255, 255, 0.1);
            color: white;
            transform: translateY(-3px);
        }
        .friendlink-section {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 30px;
        }
        .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: 1.5rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            transform: translateY(-5px);
        }
        .project-card .card-img-top {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .project-card:hover .card-img-top {
            transform: scale(1.05);
        }
        .news-card {
            border-left: 4px solid var(--primary-color);
            transition: var(--transition);
        }
        .news-card:hover {
            border-left-color: var(--accent-color);
            box-shadow: var(--box-shadow);
        }
        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 179, 0.25);
        }
        .map-container {
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
            height: 400px;
        }
        .team-member {
            text-align: center;
            margin-bottom: 30px;
        }
        .team-member img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            margin-bottom: 15px;
            border: 5px solid var(--light-color);
            box-shadow: var(--box-shadow);
        }