body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;margin:0;background:#f7fafc;color:#0f172a}button{padding:8px 12px;border-radius:6px;border:1px solid #e2e8f0;background:#fff;cursor:pointer}input[type=range]{cursor:pointer}