:root {
  --bg: #f5f7f6;
  --surface: #ffffff;
  --text: #17201e;
  --muted: #56635f;
  --line: #e0e7e4;
  --accent: #1f6b61;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1514;
    --surface: #18201e;
    --text: #edf2f0;
    --muted: #9daea9;
    --line: #26302d;
    --accent: #8cc7b1;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 72px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 8px; }
header img { width: 64px; height: 64px; border-radius: 14px; }
header .name { font-size: 15px; font-weight: 600; color: var(--muted); letter-spacing: .01em; }
nav { display: flex; flex-wrap: wrap; gap: 6px 18px; font-size: 15px; margin: 4px 0 32px; }
h1 { font-size: 34px; line-height: 1.15; margin: 0; letter-spacing: -.01em; }
h2 { font-size: 22px; line-height: 1.3; margin: 40px 0 8px; }
h3 { font-size: 17px; line-height: 1.4; margin: 24px 0 4px; }
p, li { color: var(--text); }
li + li { margin-top: 4px; }
.lede { font-size: 19px; color: var(--muted); margin: 12px 0 0; }
.updated { font-size: 14px; color: var(--muted); margin: 8px 0 0; }
.small { font-size: 15px; color: var(--muted); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 4px 20px 16px;
  margin-top: 24px;
}
.card > h2:first-child { margin-top: 16px; }
nav.toc { display: block; margin: 0; }
.toc h2 { font-size: 17px; margin: 32px 0 4px; }
.toc ul { margin: 0; font-size: 15px; }
.toc li + li { margin-top: 2px; }
ul { padding-left: 22px; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
footer a { margin-right: 16px; }
footer p { color: var(--muted); }