:root {
  --bg: #fafaf5;
  --surface: #ffffff;
  --text: #1c2420;
  --muted: #55615a;
  --brand: #1f7a44;
  --brand-soft: #e6f3eb;
  --border: #dfe5df;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111613;
    --surface: #1a211d;
    --text: #e8eee9;
    --muted: #a5b2aa;
    --brand: #6fd197;
    --brand-soft: #1d2f24;
    --border: #2c3630;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  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; align-items: center; justify-content: space-between; gap: 12px; padding-top: 20px; padding-bottom: 8px; flex-wrap: wrap; }
.logo { font-weight: 800; font-size: 24px; color: var(--brand); text-decoration: none; }
nav a { color: var(--text); margin-left: 16px; text-decoration: none; font-weight: 600; }
nav a:hover, nav a[aria-current="page"] { color: var(--brand); text-decoration: underline; }
h1 { font-size: 32px; line-height: 1.2; margin: 24px 0 8px; }
h2 { font-size: 22px; margin: 32px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
a { color: var(--brand); }
.lead { font-size: 19px; color: var(--muted); }
.muted { color: var(--muted); font-size: 15px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
.summary { background: var(--brand-soft); border: none; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; padding: 0; list-style: none; }
.features li { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; }
.features strong { display: block; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px; border-bottom: 1px solid var(--border); }
footer { padding-top: 24px; padding-bottom: 40px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--border); margin-top: 40px; }
@media (max-width: 520px) {
  h1 { font-size: 26px; }
  nav a { margin: 0 16px 0 0; }
  th, td { padding: 6px 4px; }
}