:root {
            --primary: #0a4a7a;
            --secondary: #17a2b8;
            --light: #f8f9fa;
            --dark: #343a40;
            --accent: #ff6b35;
            --shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: #333;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--primary);
        }
        .navbar {
            background-color: rgba(255,255,255,0.98) !important;
            box-shadow: var(--shadow);
            padding-top: 0.8rem;
            padding-bottom: 0.8rem;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary) !important;
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            color: var(--dark) !important;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary) 0%, #0d6efd 100%);
            color: white;
            padding: 8rem 0 6rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .hero-section p.lead {
            font-size: 1.4rem;
            opacity: 0.95;
            margin-bottom: 2rem;
        }
        .btn-primary {
            background-color: var(--accent);
            border-color: var(--accent);
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #e05a2b;
            border-color: #e05a2b;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255,107,53,0.3);
        }
        .section-padding {
            padding: 6rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            text-align: center;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary);
            border-radius: 2px;
        }
        .icon-box {
            text-align: center;
            padding: 2.5rem 1.5rem;
            border-radius: 15px;
            background: white;
            box-shadow: var(--shadow);
            transition: transform 0.4s, box-shadow 0.4s;
            height: 100%;
            margin-bottom: 1.5rem;
        }
        .icon-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .icon-box i {
            font-size: 3rem;
            color: var(--secondary);
            margin-bottom: 1.5rem;
        }
        .stats {
            background-color: var(--light);
            padding: 4rem 0;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
            line-height: 1;
        }
        .stat-label {
            color: var(--dark);
            font-weight: 600;
            font-size: 1.1rem;
        }
        .service-img {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.5s;
        }
        .service-img:hover {
            transform: scale(1.03);
        }
        .project-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s;
            margin-bottom: 2rem;
        }
        .project-card:hover {
            transform: translateY(-10px);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .news-item {
            border-bottom: 1px solid #eee;
            padding: 1.5rem 0;
            transition: background-color 0.3s;
        }
        .news-item:hover {
            background-color: #f9f9f9;
        }
        .news-date {
            color: var(--secondary);
            font-weight: 600;
            font-size: 0.9rem;
        }
        .friendlink {
            background-color: var(--light);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 1rem 2rem;
            margin: 0.5rem;
            border-radius: 8px;
            color: var(--dark);
            font-weight: 600;
            text-decoration: none;
            border: 2px solid transparent;
            transition: all 0.3s;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        .flink:hover {
            border-color: var(--secondary);
            color: var(--secondary);
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark);
            color: #aaa;
            padding-top: 4rem;
        }
        footer a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .footer-bottom {
            background-color: rgba(0,0,0,0.2);
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .contact-info i {
            width: 30px;
            color: var(--secondary);
        }
        .mobile-menu-img {
            height: 250px;
            object-fit: cover;
            border-radius: 10px;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 4rem 0;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }