:root {
  --bg: #fafaf8;
  --fg: #1c1d1f;
  --muted: #5f6368;
  --line: #e4e3df;
  --accent: #0f5c4d;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141516;
    --fg: #ececea;
    --muted: #a3a6aa;
    --line: #2c2e30;
    --accent: #5fc4ad;
    --card: #1b1c1e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 18px; padding-bottom: 18px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 20px; letter-spacing: -0.01em; color: var(--fg); text-decoration: none; }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--fg); }
main { padding: 48px 0 64px; }
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: 21px; margin: 40px 0 10px; letter-spacing: -0.01em; }
p, li { color: var(--fg); }
.lead { font-size: 19px; color: var(--muted); margin: 0 0 32px; }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px 24px; margin: 24px 0; }
dl { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 10px 20px; }
dt { color: var(--muted); font-size: 15px; }
dd { margin: 0; }
ol, ul { padding-left: 22px; }
li { margin: 6px 0; }
footer { border-top: 1px solid var(--line); padding: 24px 0 40px; }
footer p { margin: 4px 0; color: var(--muted); font-size: 14px; }
@media (max-width: 560px) {
  h1 { font-size: 28px; }
  dl { grid-template-columns: 1fr; gap: 2px 0; }
  dd { margin-bottom: 10px; }
}