:root {
            --primary-color: #1a5276;
            --secondary-color: #d4ac0d;
            --dark-color: #2c3e50;
            --light-color: #ecf0f1;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(26, 82, 118, 0.95) !important;
            box-shadow: var(--shadow);
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: bold;
            color: white !important;
        }
        .navbar-nav .nav-link {
            color: rgba(255, 255, 255, 0.9) !important;
            font-weight: 500;
            margin: 0 8px;
            transition: color 0.3s;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1541888946425-d81bb19240f5?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 180px 0 120px;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 20px;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
            text-align: center;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card, .project-card, .news-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.4s ease, box-shadow 0.4s ease;
            height: 100%;
        }
        .service-card:hover, .project-card:hover, .news-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        .project-card img {
            height: 240px;
            object-fit: cover;
            transition: transform 0.5s;
        }
        .project-card:hover img {
            transform: scale(1.05);
        }
        .news-card img {
            height: 200px;
            object-fit: cover;
        }
        .flink {
            display: inline-block;
            background: var(--light-color);
            padding: 10px 20px;
            margin: 8px;
            border-radius: 50px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid #ddd;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        .friendlink {
            background-color: #f9f9f9;
            padding: 60px 0;
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 60px 0 20px;
        }
        footer a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .contact-info i {
            color: var(--secondary-color);
            margin-right: 10px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: 1.5rem;
            box-shadow: var(--shadow);
            z-index: 1000;
            opacity: 0;
            transition: opacity 0.3s;
        }
        .back-to-top.visible {
            opacity: 1;
        }
        .btn-primary-custom {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: #154360;
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 120px 0 80px;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }