.isotope-table th, .isotope-table td { vertical-align: middle; }
        .isotope-card { background: #f8f9fc; border-radius: 16px; padding: 1rem; }
        .element-selector { background: #e9ecef; border-radius: 40px; padding: 0.3rem 0.8rem; }
        .badge-interval { background-color: #6c757d; font-weight: normal; }
        footer .list-unstyled a:hover { color: #0d6efd !important; }
        .radioactive-badge { background-color: #dc3545; font-size: 0.7rem; vertical-align: middle; }