:root { --bg: #ffffff; --fg: #1a1a1a; --muted: #4a4a4a; --link: #0b4f9c; --line: #c8c8c8; }
* { box-sizing: border-box; }
body { margin: 0; padding-inline: 16px; background: var(--bg); color: var(--fg); font: 18px/1.6 system-ui, -apple-system, "Segoe UI", Arial, sans-serif; }
.skip { position: absolute; inset-inline-start: 8px; inset-block-start: -100px; background: var(--bg); color: var(--link); padding: 8px 12px; }
.skip:focus { inset-block-start: 8px; }
header, main { max-inline-size: 72rem; margin-inline: auto; }
header { border-block-end: 1px solid var(--line); padding-block-end: 16px; }
h1 { font-size: 1.8rem; margin-block: 24px 4px; }
h2 { font-size: 1.3rem; margin-block: 0 8px; }
p { margin-block: 4px; color: var(--muted); }
.choices { display: grid; grid-template-columns: 1fr; gap: 32px; margin-block: 24px; }
.choice { border-block-start: 1px solid var(--line); padding-block-start: 16px; }
.choice iframe { display: block; inline-size: 100%; block-size: 36rem; border: 1px solid var(--line); background: var(--bg); }
.choice a { display: flex; align-items: center; min-block-size: 44px; margin-block-start: 8px; padding-block: 10px; color: var(--link); text-decoration: underline; }
a:focus-visible, iframe:focus-visible { outline: 3px solid var(--link); outline-offset: 2px; }
@media (min-width: 56em) {
  .choices { grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
}