style.css

:root{font-family:Arial,Helvetica,sans-serif;color:#202329;background:#fff;font-synthesis:none;color-scheme:light}
*{box-sizing:border-box}body{margin:0}main{max-width:1480px;margin:0 auto;padding:30px 42px 20px}
header{display:flex;align-items:center;justify-content:flex-end;gap:24px;min-height:44px}button,select{font:inherit;color:inherit}button{cursor:pointer;background:#fff;border:0}button:disabled{cursor:wait;opacity:.45}button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid #2468b4;outline-offset:3px}
.toolbar{display:flex;align-items:center;gap:28px}.methods{display:flex;gap:2px;border-bottom:1px solid #e0e2e5}.methods button{padding:11px 12px 10px;font-size:14px;color:#7b7f86;border-bottom:2px solid transparent;margin-bottom:-1px}.methods button[aria-pressed=true]{color:#202329;border-bottom-color:#202329}.samples{display:flex;align-items:center;gap:5px}.samples button{font-size:24px;width:26px;line-height:1;padding:2px;color:#707680}select{appearance:none;border:0;background:transparent;font-size:13px;padding:10px 4px;cursor:pointer;width:114px;text-align:center}
.panel-headings{display:grid;grid-template-columns:1fr 1fr;text-align:center;margin-top:30px;gap:20px}h2{font-size:16px;font-weight:500;margin:0}
#stage{position:relative;height:clamp(380px,65vh,760px);margin:4px 0 10px;touch-action:none}canvas{width:100%;height:100%;display:block;cursor:grab}canvas:active{cursor:grabbing}#status{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:13px;color:#787e87;pointer-events:none;background:rgba(255,255,255,.9)}#status[hidden]{display:none}
.transport{display:flex;align-items:center;gap:18px;max-width:680px;margin:0 auto}#play{width:32px;height:34px;display:grid;place-items:center;padding:7px}#play svg{width:18px;height:18px}#pauseIcon path{stroke:#333;stroke-width:2.3;fill:none}#playIcon path{fill:#333}#play svg[hidden]{display:none}#timeline{flex:1;min-width:0;accent-color:#4e545d;height:3px;cursor:pointer}#time{font-size:12px;font-variant-numeric:tabular-nums;min-width:72px;color:#545a63;text-align:right}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(max-width:850px){main{padding:22px 20px}header{flex-direction:column;align-items:flex-start;gap:15px}.toolbar{width:100%;justify-content:space-between;gap:12px}.panel-headings{margin-top:23px}.methods button{font-size:12px;padding:10px 7px}#stage{height:clamp(300px,48vh,500px)}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}