.generator-card{background:#1e1e1e;border:1px solid #333;border-radius:16px;width:100%;max-width:500px;padding:2rem;box-shadow:0 10px 30px rgba(0,0,0,.5)}canvas{width:100%;height:120px;background:#121212;border-radius:8px;margin-bottom:1.5rem;border:1px solid #333}.freq-display{font-size:2.5rem;font-weight:700;color:#0d6efd;font-variant-numeric:tabular-nums}.btn-check:checked+.btn-outline-secondary{background-color:#0d6efd;border-color:#0d6efd;color:#fff}