:root {
            --primary-color: #0056b3;
            --secondary-color: #17a2b8;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
            --hover-color: #004085;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95) !important;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            padding: 1rem 0;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color) !important;
        }
        .nav-link {
            color: var(--dark-color) !important;
            font-weight: 500;
            margin: 0 0.5rem;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--primary-color) !important;
        }
        .hero {
            background: linear-gradient(rgba(0, 84, 179, 0.8), rgba(23, 162, 184, 0.8)), url('https://images.unsplash.com/photo-1497366754035-f200968a6e72?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0;
            text-align: center;
        }
        .hero h1 {
            font-size: 3.5rem;
            color: white;
            margin-bottom: 1.5rem;
        }
        .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(--primary-color);
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            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;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--hover-color);
            border-color: var(--hover-color);
            transform: scale(1.05);
        }
        .flink {
            display: inline-block;
            background: var(--light-color);
            padding: 0.75rem 1.5rem;
            margin: 0.5rem;
            border-radius: 50px;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
            border: 2px solid transparent;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 3rem 0 1.5rem;
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .contact-info li {
            margin-bottom: 1rem;
        }
        .contact-info i {
            width: 30px;
            color: var(--secondary-color);
        }
        .sticky-top {
            top: 20px;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero {
                padding: 5rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        .content-text {
            text-align: justify;
            font-size: 1.1rem;
        }