:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --line: #d1d9e0;
  --link: #0969da;
  --badge-dark: block;
  --badge-light: none;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9198a1;
    --line: #3d444d;
    --link: #4493f8;
    --badge-dark: none;
    --badge-light: block;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 48px 16px 32px; }
h1 { font-size: 32px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.lead { color: var(--muted); font-size: 18px; margin: 0 0 24px; }
.muted { color: var(--muted); }
a { color: var(--link); }
section { border-top: 1px solid var(--line); padding-top: 8px; margin-top: 24px; }
.yt { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.yt a.badge img { width: 210px; height: auto; }
.yt a.badge .dark { display: var(--badge-dark); }
.yt a.badge .light { display: var(--badge-light); }
footer { max-width: 760px; margin: 0 auto; padding: 16px 16px 48px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer nav { display: flex; gap: 20px; flex-wrap: wrap; }
code { font: 14px ui-monospace, SFMono-Regular, Menlo, monospace; }