:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #ed8936;
            --light-color: #f7fafc;
            --dark-color: #2d3748;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            transition: all 0.3s;
            position: relative;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 0;
            background-color: var(--secondary-color);
            transition: width 0.3s;
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.9), rgba(26, 54, 93, 0.8)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 150px 0;
            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 4px rgba(0,0,0,0.5);
        }
        .hero-subtitle {
            font-size: 1.4rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 35px;
            font-weight: 600;
            border-radius: 30px;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: #9b2c2c;
            border-color: #9b2c2c;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .section-title {
            color: var(--primary-color);
            font-weight: 700;
            margin-bottom: 3rem;
            position: relative;
            padding-bottom: 15px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
            bottom: 0;
            left: 0;
        }
        .section-title.center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card {
            background: white;
            border-radius: 10px;
            padding: 30px;
            height: 100%;
            transition: all 0.4s;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            border: 1px solid #e2e8f0;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .project-card {
            overflow: hidden;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: all 0.3s;
        }
        .project-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .project-img {
            height: 250px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .project-card:hover .project-img {
            transform: scale(1.05);
        }
        .news-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s;
        }
        .news-card:hover {
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background-color: var(--secondary-color);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.9rem;
        }
        .team-member {
            text-align: center;
            margin-bottom: 30px;
        }
        .team-img {
            width: 180px;
            height: 180px;
            object-fit: cover;
            border-radius: 50%;
            margin-bottom: 20px;
            border: 5px solid #e2e8f0;
            transition: all 0.3s;
        }
        .team-member:hover .team-img {
            border-color: var(--secondary-color);
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background-color: #f8f9fa;
            border-radius: 5px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding-top: 70px;
        }
        .footer-links a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s;
            display: block;
            margin-bottom: 10px;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #4a5568;
            padding: 20px 0;
            margin-top: 50px;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        .contact-info i {
            width: 40px;
            height: 40px;
            line-height: 40px;
            text-align: center;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            margin-right: 15px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--secondary-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;
            transition: all 0.3s;
        }
        .back-to-top.show {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .hero-subtitle {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }