:root {
  --bg: #fbfaf7;
  --fg: #1d2420;
  --muted: #5b655f;
  --accent: #2f7a3e;
  --line: #dfe3dc;
  --card: #ffffff;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141816;
    --fg: #e8ece9;
    --muted: #a3ada6;
    --accent: #7fcf8d;
    --line: #2b322e;
    --card: #1b201d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

header, main, footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--fg);
  text-decoration: none;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 16px;
}
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--fg); }

main { padding-top: 32px; padding-bottom: 48px; }

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.3rem; margin: 40px 0 8px; }
h3 { font-size: 1.05rem; margin: 24px 0 4px; }

p, li { color: var(--fg); }
.lead { font-size: 1.15rem; color: var(--muted); }
.muted { color: var(--muted); }

a { color: var(--accent); }

.button {
  display: inline-block;
  margin: 16px 0 8px;
  padding: 12px 22px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--bg);
  font-weight: 600;
  text-decoration: none;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}
.card h3 { margin-top: 0; }
.card p { margin: 0; }

ol li, ul li { margin-bottom: 6px; }

details {
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}
summary { cursor: pointer; font-weight: 600; }
details p, details ul, details ol { margin: 8px 0 0; }

footer {
  padding-top: 20px;
  padding-bottom: 32px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { color: var(--muted); }