:root {
            --primary-color: #1a3a8f;
            --secondary-color: #00a8e8;
            --accent-color: #ff6b35;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: "Microsoft YaHei", "Segoe UI", sans-serif;
            color: #333;
            line-height: 1.6;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
            transform: translateY(-2px);
        }
        .hero {
            background: linear-gradient(rgba(26, 58, 143, 0.85), rgba(0, 168, 232, 0.8)), url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=1950&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        .hero h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 20px;
        }
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .hero { padding: 80px 0; }
        }
        .section-title {
            color: var(--primary-color);
            border-left: 5px solid var(--accent-color);
            padding-left: 15px;
            margin-bottom: 30px;
            font-weight: 700;
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
            border-radius: 12px 12px 0 0;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 10px 25px;
            border-radius: 30px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: scale(1.05);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 1.8rem;
        }
        .flink a {
            display: inline-block;
            background: var(--light-color);
            color: var(--dark-color);
            padding: 10px 20px;
            margin: 5px 10px;
            border-radius: 25px;
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid #dee2e6;
            font-weight: 500;
        }
        .flink a:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding-top: 40px;
        }
        footer a {
            color: #adb5bd;
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .contact-info i {
            width: 30px;
            color: var(--secondary-color);
        }
        .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: 1.5rem;
            text-decoration: none;
            opacity: 0.8;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top:hover {
            opacity: 1;
            transform: translateY(-5px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
        }
        .form-control:focus {
            border-color: var(--secondary-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 168, 232, 0.25);
        }