:root {
            --primary-color: #1a4f8c;
            --secondary-color: #d4af37;
            --accent-color: #c1272d;
            --dark-color: #333;
            --light-color: #f8f9fa;
            --gray-color: #6c757d;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: #333;
            line-height: 1.7;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: "";
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            padding: 1rem 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .navbar-brand span {
            color: var(--accent-color);
        }
        .nav-link {
            color: var(--dark-color) !important;
            font-weight: 600;
            margin: 0 0.5rem;
            position: relative;
        }
        .nav-link:after {
            content: "";
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
            transition: width 0.3s ease;
        }
        .nav-link:hover:after, .nav-link.active:after {
            width: 100%;
        }
        .navbar-toggler {
            border: none;
            padding: 0.5rem;
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1618220179428-22790b461013?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 10rem 0 8rem;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }
        .hero-section p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            max-width: 700px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #0d3c6c;
            border-color: #0d3c6c;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .btn-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: #333;
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .btn-secondary:hover {
            background-color: #b8941f;
            border-color: #b8941f;
            color: #333;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .service-card, .project-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            transition: all 0.4s ease;
            height: 100%;
        }
        .service-card:hover, .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }
        .service-card .card-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .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);
        }
        .stats-section {
            background-color: var(--primary-color);
            color: white;
            padding: 5rem 0;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 0.5rem;
        }
        .stat-text {
            font-size: 1.2rem;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-member img {
            width: 200px;
            height: 200px;
            border-radius: 50%;
            object-fit: cover;
            margin-bottom: 1.5rem;
            border: 5px solid #f1f1f1;
        }
        footer {
            background-color: #1a1a1a;
            color: #ccc;
            padding-top: 4rem;
        }
        footer h5 {
            color: white;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.75rem;
        }
        footer h5:after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background-color: var(--secondary-color);
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .footer-bottom {
            background-color: #111;
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .friendlink {
            background-color: #f9f9f9;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 0.8rem 1.5rem;
            margin: 0.5rem;
            border-radius: 4px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            color: var(--primary-color);
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #eee;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 7rem 0 5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .contact-form .form-control {
            padding: 0.75rem 1rem;
            border-radius: 4px;
            border: 1px solid #ddd;
            margin-bottom: 1.5rem;
        }
        .contact-form .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(26, 79, 140, 0.25);
        }