:root { color-scheme: light dark; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.55; }
body { margin: 0; background: #f5faf6; color: #10231a; }
main { width: min(760px, calc(100% - 40px)); margin: 0 auto; padding: 56px 0 80px; }
nav { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 44px; }
a { color: #137a49; font-weight: 650; }
h1 { font-size: clamp(2rem, 7vw, 3.5rem); line-height: 1.05; margin: 0 0 18px; }
h2 { margin-top: 36px; font-size: 1.3rem; }
.lead { font-size: 1.12rem; color: #52645b; }
.card { background: #fff; border: 1px solid #dbe7df; border-radius: 18px; padding: 24px; margin: 26px 0; }
footer { color: #66776e; margin-top: 48px; font-size: .9rem; }
@media (prefers-color-scheme: dark) {
  body { background: #0c1711; color: #eff8f1; }
  .lead, footer { color: #afc2b5; }
  .card { background: #14231a; border-color: #294233; }
  a { color: #6ed79a; }
}