:root {
  --bg: #f3f6f1;
  --panel: #ffffff;
  --ink: #1b2a22;
  --muted: #4f5f56;
  --line: #d9e1db;
  --accent: #2d6e50;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a17;
    --panel: #1d2420;
    --ink: #e8efe9;
    --muted: #a9b6ae;
    --line: #2e3833;
    --accent: #8fd1ad;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); }
a { color: var(--accent); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 4px 20px 16px; margin-top: 16px; }
ul { padding-left: 1.2em; }
footer { margin-top: 48px; color: var(--muted); font-size: 0.9rem; }