:root {
  --primary: #0f7a5c;
  --ink: #222222;
  --body: #3f3f3f;
  --muted: #6a6a6a;
  --hairline: #dddddd;
  --surface-soft: #f7f7f7;
}
* { box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  background: #fff;
  color: var(--body);
  font-family: "Inter Variable", Inter, -apple-system, system-ui, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  line-height: 1.6;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header.top { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 32px; }
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: 20px; color: var(--ink); text-decoration: none; }
.brand svg { color: var(--primary); }
a { color: var(--ink); text-underline-offset: 2px; }
h1 { font-size: 28px; line-height: 1.3; color: var(--ink); margin: 0 0 4px; }
h2 { font-size: 20px; line-height: 1.3; color: var(--ink); margin: 40px 0 8px; letter-spacing: -0.18px; scroll-margin-top: 16px; }
h3 { font-size: 16px; color: var(--ink); margin: 24px 0 4px; }
p, li { font-size: 15px; }
p { margin: 8px 0; }
ul, ol { padding-left: 20px; margin: 8px 0; }
li { margin: 4px 0; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 24px; }
.summary { background: var(--surface-soft); border-radius: 14px; padding: 16px 20px; margin: 24px 0; }
.summary h2 { margin-top: 0; font-size: 16px; }
.toc { border: 1px solid var(--hairline); border-radius: 14px; padding: 16px 20px; }
.toc ol { margin: 0; }
table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 12px 0; }
th, td { text-align: left; vertical-align: top; padding: 8px 8px 8px 0; border-bottom: 1px solid var(--hairline); }
th { color: var(--ink); font-weight: 600; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--hairline); display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 13px; color: var(--muted); }
@media (max-width: 600px) {
  table, thead, tbody, tr, th, td { display: block; }
  thead { display: none; }
  tr { border-bottom: 1px solid var(--hairline); padding: 8px 0; }
  td { border: 0; padding: 2px 0; }
}