:root {
  color-scheme: light;
  --ink: #17221c;
  --muted: #65736a;
  --brand: #25804d;
  --brand-dark: #176138;
  --surface: #ffffff;
  --background: #f4f8f4;
  --line: #dce8df;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
a { color: var(--brand-dark); }
.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.nav, main, footer { max-width: 920px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.nav { min-height: 68px; display: flex; align-items: center; gap: 24px; }
.logo { color: var(--brand-dark); font-size: 21px; font-weight: 700; text-decoration: none; margin-right: auto; }
.nav a { text-decoration: none; font-size: 14px; }
main { padding-top: 48px; padding-bottom: 56px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 34px 40px; box-shadow: 0 8px 28px rgba(22, 67, 39, .05); }
h1 { margin: 0 0 8px; font-size: 32px; line-height: 1.3; }
h2 { margin-top: 32px; font-size: 21px; line-height: 1.4; }
h3 { font-size: 17px; }
.meta { color: var(--muted); font-size: 14px; margin-bottom: 26px; }
.hero { padding: 52px 40px; }
.hero p { max-width: 650px; color: var(--muted); font-size: 18px; }
.links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-block; border-radius: 9px; padding: 9px 15px; color: white; background: var(--brand); text-decoration: none; }
.button.secondary { color: var(--brand-dark); background: #e8f3eb; }
li { margin: 6px 0; }
footer { color: var(--muted); font-size: 13px; padding-bottom: 34px; }
@media (max-width: 640px) {
  .nav { gap: 12px; flex-wrap: wrap; padding-top: 12px; padding-bottom: 12px; }
  .logo { width: 100%; }
  .card { padding: 24px 20px; }
  .hero { padding: 34px 20px; }
  h1 { font-size: 27px; }
}