:root {
  color-scheme: light dark;
  --ink: #1a1c1e;
  --muted: #5b6168;
  --line: #e2e4e7;
  --accent: #2f66f5;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  margin: 0;
  line-height: 1.6;
}

header.site {
  border-bottom: 1px solid var(--line);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header.site a.brand {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--ink);
}

header.site nav a {
  margin-left: 1.25rem;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}

header.site nav a:hover { color: var(--accent); }

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

h1 { font-size: 1.8rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.25rem; margin-top: 2.25rem; }
h3 { font-size: 1.05rem; margin-top: 1.5rem; }

p.lede {
  color: var(--muted);
  font-size: 1.05rem;
}

.tags { margin: 0.75rem 0 1.5rem; }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  margin-right: 0.4rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.card-grid a.card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--bg-alt);
}

.card-grid a.card:hover { border-color: var(--accent); }
.card-grid a.card .title { font-weight: 600; margin-bottom: 0.25rem; }
.card-grid a.card .desc { font-size: 0.9rem; color: var(--muted); }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.55rem 1.1rem;
  border-radius: 8px;
  margin: 0.5rem 0 1.25rem;
}

.btn:hover { opacity: 0.9; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th { color: var(--muted); font-weight: 600; }

.note {
  border-left: 3px solid var(--accent);
  background: var(--bg-alt);
  padding: 0.75rem 1rem;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

footer.site {
  border-top: 1px solid var(--line);
  padding: 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

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

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8eaed;
    --muted: #9aa0a6;
    --line: #2e3033;
    --bg: #131416;
    --bg-alt: #1b1d20;
  }
}