:root {
  --bg: #f7f7f4;
  --panel: #ffffff;
  --ink: #1c1d1f;
  --muted: #5d6066;
  --line: #e2e2dd;
  --accent: #1b5e3b;
  --accent-soft: #e6f1ea;
  --link: #1a5aa6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141514;
    --panel: #1c1e1c;
    --ink: #ecece8;
    --muted: #a7aaa4;
    --line: #2f322e;
    --accent: #7cc69b;
    --accent-soft: #20301f;
    --link: #8fb8ff;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}
a { color: var(--link); text-underline-offset: 2px; }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 8px; background: var(--panel); padding: 6px 10px; }
header.site, footer.site { border-bottom: 1px solid var(--line); background: var(--panel); }
footer.site { border-top: 1px solid var(--line); border-bottom: 0; margin-top: 56px; }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 19px; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }
nav a { margin-left: 18px; font-size: 15px; }
nav a:first-child { margin-left: 0; }
main { padding-top: 40px; }
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: 22px; line-height: 1.3; margin: 36px 0 8px; }
h3 { font-size: 18px; margin: 22px 0 6px; }
p, li { max-width: 68ch; }
ul { padding-left: 22px; }
.lede { font-size: 20px; color: var(--muted); margin-top: 0; }
.meta { color: var(--muted); font-size: 15px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 22px 24px; margin: 28px 0; }
.badge { display: inline-block; background: var(--accent-soft); color: var(--accent); font-weight: 600; font-size: 14px; padding: 3px 10px; border-radius: 999px; }
.toc { font-size: 15px; }
.toc ol { margin: 6px 0 0; padding-left: 20px; }
footer.site .wrap { padding-top: 20px; padding-bottom: 28px; font-size: 14px; color: var(--muted); }
footer.site a { margin-right: 14px; }
@media (max-width: 520px) {
  body { font-size: 16px; }
  h1 { font-size: 28px; }
  nav a { margin-left: 12px; }
}