:root {
            --primary-color: #1a365d;
            --secondary-color: #c9a96e;
            --accent-color: #2d6a4f;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'PingFang SC', 'Segoe UI', sans-serif;
            line-height: 1.8;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }
        .section-header h2 {
            font-size: 2.5rem;
            display: inline-block;
            padding-bottom: 15px;
            position: relative;
        }
        .section-header h2:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
        }
        .section-subtitle {
            color: #666;
            max-width: 700px;
            margin: 0 auto 2rem;
            font-size: 1.1rem;
        }
        .navbar {
            background-color: rgba(26, 54, 93, 0.95);
            padding: 1rem 0;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .navbar.scrolled {
            padding: 0.5rem 0;
            background-color: rgba(26, 54, 93, 0.98);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            color: rgba(255,255,255,0.9);
            font-weight: 500;
            margin: 0 10px;
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color);
        }
        .nav-link:after {
            content: '';
            position: absolute;
            bottom: 5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--secondary-color);
            transition: var(--transition);
        }
        .nav-link:hover:after, .nav-link.active:after {
            width: 100%;
        }
        .hero-section {
            height: 100vh;
            background: linear-gradient(rgba(26, 54, 93, 0.8), rgba(26, 54, 93, 0.7)), url('https://images.unsplash.com/photo-1487956382158-bb926046304a?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            color: white;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        .hero-subtitle {
            font-size: 1.3rem;
            max-width: 700px;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            color: var(--primary-color);
            font-weight: 600;
            padding: 12px 30px;
            border-radius: 4px;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #b89752;
            border-color: #b89752;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .service-card, .project-card, .team-card {
            transition: var(--transition);
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: 100%;
            border-radius: 8px;
            overflow: hidden;
        }
        .service-card:hover, .project-card:hover, .team-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .project-card img {
            transition: var(--transition);
            height: 250px;
            object-fit: cover;
        }
        .project-card:hover img {
            transform: scale(1.05);
        }
        .project-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(to top, rgba(26, 54, 93, 0.9), transparent);
            display: flex;
            align-items: flex-end;
            padding: 20px;
            opacity: 0;
            transition: var(--transition);
        }
        .project-card:hover .project-overlay {
            opacity: 1;
        }
        .counter-section {
            background: linear-gradient(rgba(26, 54, 93, 0.9), rgba(26, 54, 93, 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;
            background-attachment: fixed;
            padding: 100px 0;
            color: white;
        }
        .counter-item {
            text-align: center;
        }
        .counter {
            font-size: 3.5rem;
            font-weight: 700;
            color: var(--secondary-color);
            margin-bottom: 10px;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
            margin-top: 30px;
        }
        .timeline:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--secondary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item:before {
            content: '';
            position: absolute;
            left: -36px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--primary-color);
            border: 3px solid var(--secondary-color);
        }
        .contact-form .form-control {
            padding: 12px 15px;
            border-radius: 4px;
            border: 1px solid #ddd;
            margin-bottom: 20px;
            transition: var(--transition);
        }
        .contact-form .form-control:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(201, 169, 110, 0.25);
        }
        friendlink {
            display: block;
            margin-top: 50px;
            padding-top: 30px;
            border-top: 1px solid #eee;
        }
        .flink {
            display: inline-block;
            margin: 5px 10px;
            padding: 8px 15px;
            background-color: #f8f9fa;
            border-radius: 4px;
            color: var(--primary-color);
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #dee2e6;
        }
        .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: 992px) {
            .hero-title {
                font-size: 2.8rem;
            }
            .section-header h2 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .hero-subtitle {
                font-size: 1.1rem;
            }
            .section-header h2 {
                font-size: 1.8rem;
            }
            .counter {
                font-size: 2.5rem;
            }
        }
        @media (max-width: 576px) {
            .hero-title {
                font-size: 1.8rem;
            }
            .btn-primary-custom {
                padding: 10px 20px;
            }
        }
        .fade-in {
            animation: fadeIn 1s ease-in-out;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }