:root {
            --primary-color: #0056a6;
            --secondary-color: #28a745;
            --accent-color: #ffc107;
            --dark-color: #343a40;
            --light-color: #f8f9fa;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--dark-color);
            background-color: #fff;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: var(--primary-color);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: bold;
            color: white !important;
        }
        .nav-link {
            color: rgba(255,255,255,0.9) !important;
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--accent-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 86, 166, 0.85), rgba(0, 86, 166, 0.9)), url('https://images.unsplash.com/photo-1582719508461-905c673771fd?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 120px 0;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 20px;
        }
        .section-padding {
            padding: 80px 0;
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.08);
            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-title {
            color: var(--primary-color);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #004080;
            border-color: #004080;
            transform: scale(1.05);
        }
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
            border-radius: 30px;
            padding: 10px 25px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            color: white;
        }
        .icon-box {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 60px 0 20px;
        }
        footer a {
            color: #cccccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--accent-color);
        }
        .flink {
            display: inline-block;
            background: rgba(255,255,255,0.1);
            padding: 10px 20px;
            margin: 5px;
            border-radius: 8px;
            color: #ddd;
            transition: all 0.3s;
            text-decoration: none;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        .friendlinks {
            background: rgba(0,0,0,0.2);
            padding: 30px;
            border-radius: 15px;
            margin-top: 30px;
        }
        .sticky-top {
            top: 20px;
        }
        .research-highlight {
            border-left: 5px solid var(--secondary-color);
            padding-left: 20px;
            background: #f9f9f9;
            padding: 20px;
            border-radius: 0 10px 10px 0;
        }
        .contact-info li {
            margin-bottom: 15px;
            font-size: 1.1rem;
        }
        .contact-info i {
            color: var(--primary-color);
            width: 30px;
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 50px 0;
            }
            .display-4 {
                font-size: 2.2rem;
            }
        }
        .publication-list li {
            padding: 10px 0;
            border-bottom: 1px dashed #ddd;
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 30px;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -27px;
            top: 5px;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--secondary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px var(--primary-color);
        }