:root {
            --primary-color: #002b5c;
            --secondary-color: #c8102e;
            --accent-color: #f5a623;
            --light-bg: #f8f9fa;
            --dark-text: #333;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            color: var(--dark-text);
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(0, 43, 92, 0.85), rgba(0, 43, 92, 0.9)), url('https://via.placeholder.com/1920x800.png?text=Advanced+Metallurgy+Research') center/cover no-repeat;
            color: white;
            padding: 120px 0;
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 10px;
            margin-bottom: 30px;
            display: inline-block;
        }
        .card {
            border: none;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            transition: transform 0.3s ease;
        }
        .card:hover {
            transform: translateY(-10px);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
        }
        .flink {
            display: inline-block;
            padding: 10px 20px;
            margin: 5px;
            background-color: var(--light-bg);
            border-radius: 5px;
            color: var(--primary-color);
            text-decoration: none;
            transition: all 0.3s;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
        }
        .contact-info i {
            color: var(--accent-color);
            margin-right: 10px;
        }
        .friend-links {
            background-color: var(--light-bg);
            padding: 30px 0;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
        }
        .hover-shadow:hover {
            box-shadow: 0 8px 16px rgba(0,0,0,0.2);
        }
        .accordion-button:not(.collapsed) {
            background-color: var(--primary-color);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 80px 0;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }