:root {
  color-scheme: light dark;
  --bg: #f7f8fa;
  --fg: #15171c;
  --muted: #5b6270;
  --card: #fff;
  --line: #dde1e7;
  --accent: #1e5aa8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --fg: #e8eaee;
    --muted: #9aa2b1;
    --card: #1a1d23;
    --line: #2c313a;
    --accent: #7fb0ff;
  }
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font:
    16px/1.5 system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
  background: var(--bg);
  color: var(--fg);
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 160px;
}
h1 {
  font-size: 1.4rem;
  margin: 0 0 8px;
}
p,
li {
  color: var(--muted);
}
a {
  color: var(--accent);
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 16px;
  margin: 16px 0;
}
.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
button {
  font: inherit;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}
pre {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 12px;
  margin: 0;
}
iframe.sibling {
  width: 100%;
  height: 170px;
  border: 1px dashed #c0392b;
  border-radius: 8px;
}