:root {
            --primary: #1a3a8f;
            --secondary: #e63946;
            --accent: #2a9d8f;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark);
            line-height: 1.8;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary);
        }
        .navbar {
            background: rgba(255,255,255,0.95);
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            padding: 1rem 0;
            transition: all 0.3s;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
        }
        .navbar-brand span {
            color: var(--secondary);
        }
        .nav-link {
            font-weight: 600;
            margin: 0 0.5rem;
            color: var(--dark);
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--secondary);
            transition: all 0.3s;
            transform: translateX(-50%);
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 80%;
        }
        .hero {
            background: linear-gradient(rgba(26,58,143,0.85), rgba(42,157,143,0.8)), url('https://images.unsplash.com/photo-1568605117036-5fe5e7bab0b7?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
            color: white;
            padding: 10rem 0;
            margin-top: 76px;
        }
        .hero h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
            max-width: 700px;
        }
        .btn-primary {
            background: var(--secondary);
            border: none;
            padding: 0.8rem 2rem;
            font-weight: 600;
            border-radius: 30px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background: #c1121f;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .btn-outline-light {
            border-radius: 30px;
            padding: 0.8rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-outline-light:hover {
            background: white;
            color: var(--primary);
            transform: translateY(-3px);
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary);
        }
        .service-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: all 0.4s;
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
        }
        .service-icon {
            font-size: 3rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
        }
        .feature-box {
            padding: 3rem 2rem;
            border-radius: 15px;
            background: white;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            transition: all 0.3s;
            height: 100%;
        }
        .feature-box:hover {
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
        }
        .feature-box i {
            font-size: 2.5rem;
            color: var(--accent);
            margin-bottom: 1.5rem;
        }
        .about-img {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 15px 40px rgba(0,0,0,0.1);
        }
        .stat-item {
            text-align: center;
            padding: 2rem;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
            line-height: 1;
        }
        .stat-label {
            color: var(--gray);
            font-weight: 600;
            font-size: 1.1rem;
        }
        .team-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: all 0.3s;
        }
        .team-card:hover {
            transform: translateY(-5px);
        }
        .team-img {
            height: 250px;
            object-fit: cover;
        }
        .contact-box {
            background: white;
            border-radius: 15px;
            padding: 2.5rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            background: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin: 0 auto 1.5rem;
        }
        .form-control, .form-select {
            padding: 0.8rem 1.2rem;
            border-radius: 10px;
            border: 1px solid #ddd;
            margin-bottom: 1.5rem;
        }
        .form-control:focus, .form-select:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 0.25rem rgba(26,58,143,0.25);
        }
        footer {
            background: #1c2331;
            color: white;
            padding-top: 4rem;
        }
        .footer-links h5 {
            color: white;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        .footer-links h5::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary);
        }
        .footer-links ul {
            list-style: none;
            padding-left: 0;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #b0b7c3;
            text-decoration: none;
            transition: all 0.3s;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            background: #161c29;
            padding: 1.5rem 0;
            margin-top: 3rem;
            border-top: 1px solid #2a3040;
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 30px;
            margin: 0.5rem;
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid rgba(255,255,255,0.2);
        }
        .flink:hover {
            background: var(--secondary);
            color: white;
            transform: translateY(-3px);
            border-color: var(--secondary);
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            color: white;
            border-radius: 50%;
            margin-right: 0.8rem;
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background: var(--secondary);
            transform: translateY(-3px);
        }
        .map-container {
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            height: 400px;
        }
        .map-container iframe {
            width: 100%;
            height: 100%;
            border: none;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            text-decoration: none;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary);
            color: white;
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero {
                padding: 6rem 0;
                text-align: center;
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .section-title {
                font-size: 2rem;
            }
            .stat-number {
                font-size: 2.5rem;
            }
        }