:root {
            --primary-color: #0056b3;
            --secondary-color: #6c757d;
            --accent-color: #dc3545;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--dark-text);
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 600;
            margin-bottom: 1rem;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            transition: var(--transition);
        }
        .navbar-nav .nav-link:hover {
            color: var(--primary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 179, 0.85), rgba(0, 86, 179, 0.9)), url('https://images.unsplash.com/photo-1516321318423-f06f85e504b3?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0;
            min-height: 80vh;
            display: flex;
            align-items: center;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .hero-section .lead {
            font-size: 1.5rem;
            margin-bottom: 2rem;
            opacity: 0.95;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: var(--primary-color);
        }
        .section-title.center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .service-card {
            background: white;
            border-radius: 10px;
            padding: 2rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            height: 100%;
            transition: var(--transition);
            border: 1px solid #eee;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
            border-color: var(--primary-color);
        }
        .service-icon {
            width: 80px;
            height: 80px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .case-study-item {
            position: relative;
            overflow: hidden;
            border-radius: 8px;
            margin-bottom: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .case-study-img {
            height: 300px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .case-study-item:hover .case-study-img {
            transform: scale(1.05);
        }
        .case-study-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0,86,179,0.9));
            color: white;
            padding: 2rem;
            transform: translateY(20px);
            transition: var(--transition);
        }
        .case-study-item:hover .case-study-overlay {
            transform: translateY(0);
        }
        .team-member {
            text-align: center;
            margin-bottom: 2rem;
        }
        .team-img {
            width: 200px;
            height: 200px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0 auto 1rem;
            border: 5px solid var(--light-bg);
            transition: var(--transition);
        }
        .team-member:hover .team-img {
            transform: scale(1.05);
            border-color: var(--primary-color);
        }
        .contact-info-item {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            text-align: center;
            transition: var(--transition);
            height: 100%;
        }
        .contact-info-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .contact-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .footer {
            background: #1a1a1a;
            color: #ddd;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #ddd;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .friendlink {
            background: var(--light-bg);
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 10px;
            border-radius: 30px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
            transition: var(--transition);
            color: var(--dark-text);
            text-decoration: none !important;
            font-weight: 500;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            color: var(--primary-color);
            background: #f0f7ff;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            transition: var(--transition);
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
        }
        .back-to-top:hover {
            background: #004494;
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section .lead {
                font-size: 1.2rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .team-img {
                width: 150px;
                height: 150px;
            }
        }
        .news-item {
            border-left: 4px solid var(--primary-color);
            padding-left: 20px;
            margin-bottom: 2rem;
        }
        .news-date {
            color: var(--secondary-color);
            font-size: 0.9rem;
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .stats-item {
            text-align: center;
            padding: 2rem;
        }
        .modal-content {
            border-radius: 10px;
            border: none;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.6rem 2rem;
            font-weight: 500;
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,86,179,0.3);
        }
        .text-primary {
            color: var(--primary-color) !important;
        }