:root {
  --text: #15181c;
  --muted: #5f6670;
  --bg: #f6f5f1;
  --card: #ffffff;
  --border: #e2e0d9;
  --accent: #1f6f4a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2ef;
    --muted: #a3a9b1;
    --bg: #0f1211;
    --card: #1a1e1d;
    --border: #2b312f;
    --accent: #5cc98f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
header img { height: 56px; width: auto; }
@media (prefers-color-scheme: dark) { header img.logo { filter: invert(1) hue-rotate(180deg); } }
nav { display: flex; flex-wrap: wrap; gap: 16px; margin: 8px 0 32px; font-size: 15px; }
a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
.muted { color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
ol, ul { padding-left: 22px; }
footer { margin-top: 48px; font-size: 14px; color: var(--muted); }