body { font-family: system-ui, sans-serif; margin: 24px; line-height: 1.45; }
main { max-width: 880px; margin: 0 auto; }
label { display: block; margin: 12px 0; }
input { box-sizing: border-box; display: block; width: 100%; max-width: 420px; margin-top: 4px; padding: 10px; font: inherit; }
button { padding: 10px 14px; font: inherit; }
iframe { width: 100%; height: 290px; border: 2px solid #a33; }
pre { min-height: 96px; padding: 12px; overflow: auto; background: #111; color: #eee; }
.origin { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }