:root {
  --bg: #fbfaf7;
  --text: #1f2328;
  --muted: #5b6168;
  --accent: #1f6f5c;
  --card: #ffffff;
  --border: #e3e0d8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181b;
    --text: #e8e6e1;
    --muted: #a3a8ae;
    --accent: #5cc3a6;
    --card: #1d2125;
    --border: #2e3338;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main, header, footer { max-width: 680px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 40px; }
header .brand { font-weight: 700; font-size: 1.1rem; color: var(--accent); text-decoration: none; }
h1 { font-size: 2rem; line-height: 1.2; margin: 24px 0 8px; }
h2 { font-size: 1.3rem; margin: 40px 0 12px; }
p.lead { font-size: 1.15rem; color: var(--muted); margin-top: 0; }
a { color: var(--accent); }
ol, ul { padding-left: 1.3em; }
details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  margin: 10px 0;
}
summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 2px; }
code { font-size: 0.92em; background: var(--card); border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; overflow-wrap: anywhere; }
.contact {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}
footer { color: var(--muted); font-size: 0.9rem; padding-top: 48px; padding-bottom: 40px; }
footer a { color: var(--muted); }