:root {
  color-scheme: light dark;
  --bg: #f4f6fa;
  --fg: #1b2532;
  --dim: #5d6a80;
  --card: #fff;
  --line: #dfe5ee;
  --warn-bg: #fff4d6;
  --warn: #7a5200;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1624;
    --fg: #eef3fa;
    --dim: #9aa6b8;
    --card: #17213a;
    --line: #26324c;
    --warn-bg: #3a2e10;
    --warn: #ffd98a;
  }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font:
    16px / 1.6 system-ui,
    -apple-system,
    "Segoe UI",
    sans-serif;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}
h1 {
  font-size: 30px;
  margin: 0 0 4px;
}
.meta {
  color: var(--dim);
  margin: 0 0 20px;
}
section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 4px 20px 12px;
  margin: 0 0 14px;
}
h2 {
  font-size: 19px;
  margin: 16px 0 6px;
}
a {
  color: #3b82ff;
}
ul {
  margin: 6px 0 10px;
  padding-left: 22px;
}
li {
  margin: 3px 0;
}
h3 {
  font-size: 16px;
  margin: 14px 0 4px;
}
.back {
  display: inline-block;
  margin: 0 0 18px;
  font-weight: 600;
  text-decoration: none;
}