:root {
  color-scheme: light dark;
  --bg: #f6f7f4;
  --card: #ffffff;
  --text: #142016;
  --muted: #5c675f;
  --line: #e2e6df;
  --green: #1f8a3b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101411;
    --card: #191e1a;
    --text: #f3f6f2;
    --muted: #b7c0b8;
    --line: #2a322c;
    --green: #3dce67;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 72px;
}

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

header h1 {
  margin: 0 0 8px;
  font-size: 40px;
  letter-spacing: 0.08em;
}

.lead, .updated {
  color: var(--muted);
}

nav {
  display: flex;
  gap: 16px;
  margin: 28px 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

h2 {
  margin: 28px 0 8px;
  font-size: 20px;
}

p { margin: 0 0 12px; }