:root {
  --bg: #fbfdfb;
  --fg: #16211a;
  --muted: #5a6b60;
  --rule: #dde7e0;
  --accent: #1f7a4d;
  --card: #f1f6f2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1411;
    --fg: #e6ede8;
    --muted: #9aaba0;
    --rule: #243029;
    --accent: #5fd39a;
    --card: #16201a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 3rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main { max-width: 40rem; margin: 0 auto; }

.mark {
  font-weight: 650;
  letter-spacing: -0.015em;
  font-size: 1.05rem;
  color: var(--accent);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 2.5rem;
}

h1 {
  font-size: clamp(1.9rem, 5.5vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  font-weight: 640;
}

h2 {
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  margin: 2.25rem 0 0.5rem;
  font-weight: 640;
}

.lede { font-size: 1.15rem; color: var(--muted); margin: 0 0 2rem; }

p { margin: 0 0 1rem; }

ul { margin: 0 0 1rem; padding-left: 1.15rem; }
li { margin-bottom: 0.4rem; }

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

.notice {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1rem 1.15rem;
  margin: 2rem 0;
}

.notice strong { display: block; margin-bottom: 0.2rem; }
.notice p { margin: 0; color: var(--muted); }

footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

footer a { margin-right: 1rem; }

.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 2rem; }