:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --accent-color: #ffc107;
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        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);
            margin-bottom: 1rem;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            padding: 1rem 0;
            transition: var(--transition);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            color: var(--dark-color) !important;
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--primary-color);
            left: 50%;
            bottom: 0;
            transition: var(--transition);
            transform: translateX(-50%);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 80%;
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(0, 86, 179, 0.85) 0%, rgba(23, 162, 184, 0.8) 100%), url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }
        .hero-section p.lead {
            font-size: 1.4rem;
            max-width: 700px;
            margin: 0 auto 2rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #004494;
            border-color: #004494;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0, 86, 179, 0.3);
        }
        .btn-outline-light {
            border-radius: 50px;
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-outline-light:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 255, 255, 0.2);
        }
        .section-padding {
            padding: 5rem 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 3.5rem;
            position: relative;
        }
        .section-title h2 {
            font-size: 2.5rem;
            display: inline-block;
            padding-bottom: 1rem;
        }
        .section-title h2::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .icon-box {
            text-align: center;
            padding: 2rem;
            border-radius: 15px;
            transition: var(--transition);
            background: white;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            margin-bottom: 1.5rem;
        }
        .icon-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 86, 179, 0.1);
        }
        .icon-box i {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            display: block;
        }
        .feature-card {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
            transition: var(--transition);
            height: 100%;
            background: white;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 25px 50px rgba(0, 86, 179, 0.15);
        }
        .feature-card img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .feature-card:hover img {
            transform: scale(1.05);
        }
        .feature-card .card-body {
            padding: 2rem;
        }
        .news-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
            transition: var(--transition);
            height: 100%;
        }
        .news-card:hover {
            box-shadow: 0 15px 35px rgba(0, 86, 179, 0.1);
        }
        .news-card .card-img-top {
            height: 200px;
            object-fit: cover;
        }
        .news-date {
            background: var(--primary-color);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 5px;
            position: absolute;
            top: 15px;
            right: 15px;
            font-size: 0.9rem;
        }
        .contact-info {
            background: var(--light-color);
            padding: 2.5rem;
            border-radius: 15px;
            height: 100%;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
        }
        .contact-info i {
            color: var(--primary-color);
            font-size: 1.5rem;
            margin-bottom: 1rem;
        }
        .contact-form .form-control {
            padding: 1rem;
            border-radius: 10px;
            border: 1px solid #ddd;
            margin-bottom: 1.5rem;
            transition: var(--transition);
        }
        .contact-form .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 86, 179, 0.25);
        }
        footer {
            background-color: var(--dark-color);
            color: #ccc;
            padding: 3rem 0 1rem;
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .flink {
            display: inline-block;
            background: rgba(255, 255, 255, 0.1);
            padding: 0.5rem 1.2rem;
            margin: 0.5rem;
            border-radius: 50px;
            transition: var(--transition);
            color: #ccc;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
            text-decoration: none;
        }
        .friendlink {
            background: rgba(0, 0, 0, 0.2);
            padding: 2rem;
            border-radius: 15px;
            margin: 2rem 0;
        }
        .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;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            z-index: 1000;
            box-shadow: 0 5px 15px rgba(0, 86, 179, 0.3);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #004494;
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section p.lead {
                font-size: 1.2rem;
            }
            .section-padding {
                padding: 3rem 0;
            }
            .section-title h2 {
                font-size: 2rem;
            }
        }