:root {
            --primary-color: #1a237e;
            --secondary-color: #0d47a1;
            --accent-color: #ffab00;
            --light-color: #f8f9fa;
            --dark-color: #212529;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--dark-color);
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 35, 126, 0.85), rgba(13, 71, 161, 0.9)), url('https://picsum.photos/1920/1080?random=1') no-repeat center center/cover;
            color: white;
            padding: 150px 0;
        }
        .section-title {
            color: var(--primary-color);
            border-bottom: 3px solid var(--accent-color);
            display: inline-block;
            padding-bottom: 10px;
        }
        .card {
            border: none;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            transition: transform 0.3s ease;
        }
        .card:hover {
            transform: translateY(-10px);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            transition: background 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
        }
        .footer {
            background-color: var(--dark-color);
            color: var(--light-color);
        }
        .friendlink .flink {
            display: inline-block;
            margin: 10px 15px;
            padding: 10px 20px;
            background: #e9ecef;
            border-radius: 10px;
            text-decoration: none;
            color: var(--primary-color);
            transition: all 0.3s ease;
        }
        .friendlink .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        .img-fluid {
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .sticky-top {
            backdrop-filter: blur(10px);
            background-color: rgba(255, 255, 255, 0.95);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 100px 0;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }