:root {
            --primary: #2c3e50;
            --secondary: #3498db;
            --accent: #e74c3c;
            --light: #ecf0f1;
            --dark: #2c3e50;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
        }

        .hero-section {
            background-size: cover;
            background-position: center;
            color: white;
            padding: 100px 0;
            text-align: center;
        }

        .feature-card {
            background: white;
            border-radius: 15px;
            padding: 30px;
            margin: 15px 0;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            height: 100%;
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        }

        .feature-icon {
            font-size: 3rem;
            color: var(--secondary);
            margin-bottom: 20px;
        }

        .login-card {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            border: none;
            overflow: hidden;
        }

        .login-header {
            background: var(--primary);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .stats-section {
            background: var(--light);
            padding: 60px 0;
        }

        .stat-item {
            text-align: center;
            padding: 20px;
        }

        .stat-number {
            font-size: 3rem;
            font-weight: bold;
            color: var(--secondary);
            display: block;
        }

        .nav-link {
            color: white !important;
            font-weight: 500;
            transition: all 0.3s ease;
            margin: 0 5px;
        }

        .nav-link:hover {
            color: #ffd700 !important;
            transform: translateY(-2px);
        }

        .nav-buttons .btn {
            margin-left: 10px;
            border-radius: 20px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .nav-buttons .btn-outline-light {
            border: 2px solid white;
            color: white;
        }

        .nav-buttons .btn-outline-light:hover {
            background: white;
            color: var(--primary);
            transform: translateY(-2px);
        }

        .nav-buttons .btn-light {
            background: white;
            color: var(--primary);
            border: 2px solid white;
        }

        .nav-buttons .btn-light:hover {
            background: transparent;
            color: white;
            transform: translateY(-2px);
        }

        .btn-primary {
            background: linear-gradient(45deg, var(--secondary), #2980b9);
            border: none;
            border-radius: 25px;
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(52, 152, 219, 0.3);
        }

        .library-hours {
            background: var(--primary);
            color: white;
            padding: 30px;
            border-radius: 15px;
            margin-bottom: 20px;
        }

        .floating-action {
            position: fixed;
            bottom: 30px;
            right: 30px;
            z-index: 1000;
        }

        .floating-btn {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--accent);
            color: white;
            border: none;
            font-size: 1.5rem;
            box-shadow: 0 10px 25px rgba(231, 76, 60, 0.3);
            transition: all 0.3s ease;
        }

        .floating-btn:hover {
            transform: scale(1.1);
        }

        .animated-text {
            background: linear-gradient(45deg, #ffd700, #ffed4e);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            font-weight: bold;
        }

        .category-badge {
            background: var(--secondary);
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 0.8rem;
            margin: 2px;
            display: inline-block;
        }

        @media (max-width: 768px) {
            .nav-buttons {
                margin-top: 15px;
                text-align: center;
            }
            
            .nav-buttons .btn {
                margin: 5px;
                display: block;
                width: 100%;
            }
        }