:root {
            --primary-color: #0d6efd;
            --secondary-color: #6c757d;
            --accent-color: #198754;
            --light-bg: #f8f9fa;
            --dark-bg: #212529;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            line-height: 1.6;
            color: #333;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1504307651254-35680f356dfd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
        }
        .nav-link {
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .section-title {
            position: relative;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card, .project-card, .news-card {
            transition: transform 0.3s, box-shadow 0.3s;
            border: none;
            border-radius: 10px;
            overflow: hidden;
        }
        .service-card:hover, .project-card:hover, .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px;
            background: var(--light-bg);
            border-radius: 5px;
            text-decoration: none;
            color: var(--dark-bg);
            transition: background 0.3s, color 0.3s;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
        }
        footer {
            background: var(--dark-bg);
            color: white;
        }
        .contact-info i {
            margin-right: 10px;
            color: var(--primary-color);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transition: background-color 0.3s, border-color 0.3s;
        }
        .btn-primary:hover {
            background-color: #0b5ed7;
            border-color: #0a58ca;
        }
        .img-fluid {
            border-radius: 10px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .section-title::after {
                width: 60px;
            }
        }