:root {
  color-scheme: light dark;
  --bg: #fbfbf9; --fg: #1c1c1a; --muted: #5f6360;
  --accent: #2e7d5b; --rule: #e2e2dd;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141614; --fg: #e8e8e4; --muted: #9aa09b;
    --accent: #7fd1a8; --rule: #2a2d2a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 42rem; margin: 0 auto; padding: 0 1.5rem 5rem; }
header { padding: 3rem 0 1.5rem; }
.back { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
.back:hover { color: var(--accent); }
h1 { font-size: 2.1rem; line-height: 1.15; margin: 1.5rem 0 0.4rem; letter-spacing: -0.02em; }
.updated { color: var(--muted); font-size: 0.95rem; margin: 0 0 2.5rem; }
h2 { font-size: 1.25rem; margin: 2.75rem 0 0.9rem; }
p, li { margin: 0 0 1.1rem; }
ol, ul { padding-left: 1.3rem; }
strong { font-weight: 650; }
a { color: var(--accent); text-underline-offset: 2px; }
.note {
  border-left: 3px solid var(--accent); padding: 0.1rem 0 0.1rem 1.1rem;
  color: var(--muted); margin: 2rem 0;
}
footer {
  margin-top: 3.5rem; padding-top: 1.75rem; border-top: 1px solid var(--rule);
  color: var(--muted); font-size: 0.93rem;
}