:root {
            --primary: #1a6fb3;
            --secondary: #ff9800;
            --dark: #2c3e50;
            --light: #f8f9fa;
            --success: #28a745;
            --gray: #6c757d;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
            color: #333;
            line-height: 1.6;
        }
        h1, h2, h3, h4, h5 {
            color: var(--dark);
            font-weight: 700;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary);
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark) !important;
            padding: 0.5rem 1.2rem !important;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 111, 179, 0.85), rgba(26, 111, 179, 0.9)), url('https://images.unsplash.com/photo-1466611653911-95081537e5b7?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 120px 0;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .btn-primary {
            background-color: var(--primary);
            border-color: var(--primary);
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #155a8a;
            border-color: #155a8a;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .btn-secondary {
            background-color: var(--secondary);
            border-color: var(--secondary);
            color: white;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-secondary:hover {
            background-color: #e68900;
            border-color: #e68900;
            transform: translateY(-2px);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 70px;
            height: 4px;
            background-color: var(--secondary);
        }
        .section-title.center:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .icon-box {
            text-align: center;
            padding: 30px 20px;
            border-radius: 10px;
            background-color: white;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .icon-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .icon-box i {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 20px;
        }
        .service-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s;
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
        }
        .service-card img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .stat-box {
            text-align: center;
            padding: 30px 20px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
            line-height: 1;
        }
        .project-item {
            position: relative;
            border-radius: 10px;
            overflow: hidden;
            margin-bottom: 30px;
        }
        .project-item img {
            width: 100%;
            height: 300px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .project-item:hover img {
            transform: scale(1.05);
        }
        .project-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0,0,0,0.8));
            color: white;
            padding: 20px;
            transform: translateY(100%);
            transition: transform 0.3s;
        }
        .project-item:hover .project-overlay {
            transform: translateY(0);
        }
        .news-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s;
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-5px);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background-color: var(--primary);
            color: white;
            padding: 8px 15px;
            border-radius: 5px;
            font-weight: 600;
        }
        .contact-info-box {
            padding: 30px;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-align: center;
            height: 100%;
        }
        .contact-info-box i {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 20px;
        }
        .friendlink {
            background-color: #f8f9fa;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px 10px;
            background-color: white;
            border-radius: 5px;
            color: var(--dark);
            text-decoration: none;
            font-weight: 600;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        .flink:hover {
            background-color: var(--primary);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark);
            color: rgba(255,255,255,0.8);
        }
        footer a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-links h5:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 3px;
            background-color: var(--secondary);
        }
        .copyright {
            background-color: rgba(0,0,0,0.2);
            padding: 20px 0;
            font-size: 0.9rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 1000;
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary);
            color: white;
        }