:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --rule: #e4e4e7;
  --accent: #1f5f4b;
  --note-bg: #f6f7f6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --fg: #e8e8ea;
    --muted: #9a9aa2;
    --rule: #2c2d31;
    --accent: #6fbfa2;
    --note-bg: #1d1f22;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: 3rem 1.25rem 5rem;
}

header {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1.25rem;
  margin-bottom: 2.5rem;
}

.brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
}

nav { margin-top: 0.75rem; }

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-right: 1.25rem;
}

nav a:hover, nav a[aria-current="page"] { color: var(--accent); }

h1 {
  font-size: 1.85rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}

h2 {
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  margin: 2.5rem 0 0.6rem;
}

h3 {
  font-size: 1rem;
  margin: 1.75rem 0 0.4rem;
}

.updated {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 0 0 2rem;
}

p, li { color: var(--fg); }

ul, ol { padding-left: 1.25rem; }

li { margin: 0.35rem 0; }

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

code {
  background: var(--note-bg);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  font-size: 0.9em;
}

.note {
  background: var(--note-bg);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 1rem 1.15rem;
  margin: 1.5rem 0;
}

.note p:first-child { margin-top: 0; }
.note p:last-child { margin-bottom: 0; }

.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin-top: 2rem;
}

.card {
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  display: block;
}

.card:hover { border-color: var(--accent); }

.card h2 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }

footer {
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  padding-top: 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
}

footer a { color: var(--muted); }