:root {
  --bg: #ffffff;
  --surface: #f6f7f9;
  --text: #16181d;
  --muted: #5b6370;
  --line: #e3e6eb;
  --accent: #2f6df6;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a21;
    --text: #eceef2;
    --muted: #9aa2b1;
    --line: #262b35;
    --accent: #6f9bff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}

header.site {
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}

header.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: baseline;
  justify-content: space-between;
}

header.site a { color: var(--muted); text-decoration: none; }
header.site a:hover { color: var(--accent); }
header.site nav { display: flex; gap: 18px; font-size: 15px; }

.home { color: var(--text); font-weight: 600; }

main { padding: 48px 0 64px; }

h1 {
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}

h2 {
  font-size: 20px;
  letter-spacing: -0.01em;
  margin: 36px 0 10px;
  padding-top: 4px;
}

h3 { font-size: 17px; margin: 22px 0 6px; }

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

.lede {
  font-size: 19px;
  color: var(--muted);
  margin: 0 0 32px;
}

.updated {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 32px;
}

ul { padding-left: 22px; }
li { margin: 6px 0; }

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

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 28px 0;
}

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

.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin: 32px 0;
}

.grid .card { margin: 0; }
.grid h3 { margin-top: 0; }
.grid p { color: var(--muted); margin-bottom: 0; font-size: 16px; }

footer.site {
  border-top: 1px solid var(--line);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 15px;
}

footer.site nav { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 8px; }

@media (max-width: 480px) {
  h1 { font-size: 28px; }
  main { padding: 36px 0 48px; }
}