:root {
            --primary-blue: #0a4d8c;
            --secondary-blue: #1e6fb8;
            --accent-gold: #d4af37;
            --light-bg: #f8f9fa;
            --dark-text: #333;
            --light-text: #fff;
            --border-color: #dee2e6;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--dark-text);
            line-height: 1.7;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            color: var(--primary-blue);
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95) !important;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }
        .navbar.scrolled {
            padding-top: 5px;
            padding-bottom: 5px;
            background-color: rgba(255, 255, 255, 0.98) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(10, 77, 140, 0.85), rgba(30, 111, 184, 0.8)), url('https://images.unsplash.com/photo-1542332213-31f87348057f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center;
            background-size: cover;
            color: var(--light-text);
            padding: 120px 0 100px;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 700;
            margin-bottom: 20px;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 50px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 70px;
            height: 3px;
            background-color: var(--accent-gold);
        }
        .section-title.text-center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-icon {
            font-size: 2.5rem;
            color: var(--secondary-blue);
            margin-bottom: 20px;
        }
        .card {
            border: none;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .service-card .icon-wrapper {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 20px auto;
            color: white;
            font-size: 2rem;
        }
        .project-img {
            height: 250px;
            object-fit: cover;
            border-top-left-radius: 10px;
            border-top-right-radius: 10px;
        }
        .news-date {
            background-color: var(--primary-blue);
            color: white;
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            position: absolute;
            top: -35px;
            left: 20px;
            font-weight: bold;
        }
        .contact-info li {
            margin-bottom: 15px;
            display: flex;
            align-items: flex-start;
        }
        .contact-info i {
            color: var(--secondary-blue);
            margin-right: 15px;
            margin-top: 5px;
            font-size: 1.2rem;
        }
        .footer {
            background-color: #1a365d;
            color: #cbd5e0;
            padding: 60px 0 30px;
        }
        .footer a {
            color: #cbd5e0;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 25px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent-gold);
            display: inline-block;
        }
        .copyright {
            background-color: #0f2942;
            padding: 20px 0;
            margin-top: 40px;
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: var(--light-bg);
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: 50px;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
            color: var(--dark-text);
            text-decoration: none;
            transition: all 0.3s ease;
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--secondary-blue);
            color: white;
            transform: translateY(-3px);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background-color: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background-color: var(--secondary-blue);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }