:root {
            --primary-color: #1a237e;
            --secondary-color: #ff6f00;
            --light-bg: #f8f9fa;
        }
        body {
            font-family: 'Microsoft YaHei', sans-serif;
            color: #333;
        }
        .navbar-brand {
            font-weight: bold;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1489599809516-9827b6d1cf13?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') center/cover no-repeat;
            color: white;
            padding: 150px 0;
            text-align: center;
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--secondary-color);
            display: inline-block;
            padding-bottom: 10px;
            margin-bottom: 30px;
        }
        .service-card, .project-card {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .service-card:hover, .project-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
        }
        .icon-box {
            background: var(--primary-color);
            color: white;
            width: 80px;
            height: 80px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        footer {
            background: #212529;
            color: #adb5bd;
            padding: 40px 0;
        }
        .friendlink a.flink {
            color: #ff6f00;
            text-decoration: none;
            padding: 5px 10px;
            border: 1px solid #ff6f00;
            border-radius: 5px;
            transition: all 0.3s ease;
        }
        .friendlink a.flink:hover {
            background: #ff6f00;
            color: white;
        }
        .contact-info a {
            color: #ff6f00;
            text-decoration: none;
        }
        .contact-info a:hover {
            text-decoration: underline;
        }
        .news-item {
            border-left: 5px solid var(--primary-color);
            padding-left: 15px;
            margin-bottom: 20px;
        }
        .btn-primary-custom {
            background: var(--primary-color);
            border: none;
            padding: 10px 30px;
        }
        .btn-primary-custom:hover {
            background: #0d1b6b;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }