:root {
  color-scheme: light;
  --ink: #172421;
  --muted: #53645e;
  --brand: #27615c;
  --line: #dfe8e4;
  --panel: #ffffff;
  --background: #f6f8f5;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
header, main, footer { width: min(920px, calc(100% - 36px)); margin: 0 auto; }
header { padding: 42px 0 20px; }
main { padding-bottom: 36px; }
footer { padding: 20px 0 40px; color: var(--muted); border-top: 1px solid var(--line); }
h1 { margin: 0 0 8px; font-size: clamp(2rem, 6vw, 3rem); line-height: 1.15; }
h2 { margin-top: 30px; font-size: 1.3rem; }
p, li { color: var(--muted); }
a { color: var(--brand); }
nav { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 20px; }
.card { padding: 22px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.important { border-left: 4px solid var(--brand); padding-left: 16px; }