:root {
            --primary-blue: #0d6efd;
            --primary-dark: #052c65;
            --accent-teal: #20c997;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.8;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-dark) !important;
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--accent-teal) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(5, 44, 101, 0.85), rgba(5, 44, 101, 0.9)), url('https://images.unsplash.com/photo-1586773860418-dc22f8b874bc?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            color: var(--primary-dark);
        }
        .section-title:after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 60px;
            height: 4px;
            background: var(--accent-teal);
        }
        .text-center .section-title:after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card-hover {
            transition: transform 0.4s, box-shadow 0.4s;
            height: 100%;
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background: rgba(13, 110, 253, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--primary-blue);
            font-size: 2rem;
        }
        .flink {
            display: inline-block;
            background: var(--light-bg);
            padding: 10px 20px;
            margin: 5px;
            border-radius: 50px;
            text-decoration: none;
            color: var(--primary-dark);
            transition: all 0.3s;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary-blue);
            color: white;
            transform: scale(1.05);
        }
        .contact-info a {
            color: var(--primary-dark);
            text-decoration: none;
            transition: color 0.3s;
        }
        .contact-info a:hover {
            color: var(--accent-teal);
        }
        footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.8);
        }
        .footer-link {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer-link:hover {
            color: white;
        }
        .sticky-top {
            backdrop-filter: blur(10px);
            background-color: rgba(255, 255, 255, 0.95);
        }
        .accordion-button:not(.collapsed) {
            background-color: rgba(13, 110, 253, 0.1);
            color: var(--primary-dark);
        }
        .img-thumbnail {
            border-radius: 12px;
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 5rem 0;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }