:root {
            --primary-color: #0a4a7c;
            --secondary-color: #f8b735;
            --accent-color: #28a745;
            --dark-color: #333;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--dark-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
        }
        .bg-light-custom {
            background-color: rgba(248, 249, 250, 0.9);
        }
        .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 {
            font-weight: 600;
            margin: 0 8px;
            color: var(--dark-color) !important;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(10, 74, 124, 0.85), rgba(10, 74, 124, 0.9)), url('https://images.unsplash.com/photo-1504307651254-35680f356dfd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 160px 0 120px;
            min-height: 100vh;
            display: flex;
            align-items: center;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
        }
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            opacity: 0.95;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: #333;
            font-weight: 600;
            padding: 12px 35px;
            border-radius: 30px;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: #e0a325;
            border-color: #e0a325;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .service-card {
            background: white;
            border-radius: 10px;
            padding: 40px 30px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            height: 100%;
            transition: transform 0.3s, box-shadow 0.3s;
            border-top: 5px solid transparent;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
            border-top-color: var(--secondary-color);
        }
        .service-icon {
            font-size: 3.5rem;
            color: var(--primary-color);
            margin-bottom: 25px;
        }
        .project-card {
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
            margin-bottom: 30px;
            transition: transform 0.3s;
            height: 100%;
        }
        .project-card:hover {
            transform: translateY(-8px);
        }
        .project-img {
            height: 250px;
            object-fit: cover;
            width: 100%;
        }
        .project-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(10, 74, 124, 0.85);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity 0.4s;
        }
        .project-card:hover .project-overlay {
            opacity: 1;
        }
        .stats-section {
            background: linear-gradient(rgba(10, 74, 124, 0.9), rgba(10, 74, 124, 0.95)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 100px 0;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 10px;
            color: var(--secondary-color);
        }
        .stat-title {
            font-size: 1.2rem;
            font-weight: 600;
        }
        .contact-info-box {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            text-align: center;
            height: 100%;
            transition: transform 0.3s;
        }
        .contact-info-box:hover {
            transform: translateY(-5px);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        footer {
            background-color: #1a2a3a;
            color: #b0b7c3;
            padding-top: 70px;
        }
        .footer-title {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary-color);
        }
        .footer-links a {
            color: #b0b7c3;
            text-decoration: none;
            display: block;
            margin-bottom: 12px;
            transition: color 0.3s, padding-left 0.3s;
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 8px;
        }
        .copyright {
            background-color: #0d1926;
            padding: 20px 0;
            margin-top: 50px;
            font-size: 0.9rem;
        }
        .friendlink {
            padding: 20px 0;
            background-color: var(--light-color);
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 10px 20px;
            margin: 5px 10px;
            border-radius: 5px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            border: 1px solid #e0e0e0;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            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;
            z-index: 1000;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-color);
            color: #333;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }