:root { color-scheme: light dark; --fg: #1a1a1a; --muted: #5c5c5c; --bg: #fff; --accent: #2b6cb0; --line: #e2e2e2; }
@media (prefers-color-scheme: dark) {
  :root { --fg: #e8e8e8; --muted: #a0a0a0; --bg: #16181c; --accent: #7cb3ea; --line: #2c2f36; }
}
* { box-sizing: border-box; }
body {
  margin: 0 auto; padding: 3rem 1.25rem 5rem; max-width: 44rem;
  font: 16px/1.65 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg); background: var(--bg);
}
h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 .5rem; }
h2 { font-size: 1.15rem; margin: 2.25rem 0 .5rem; }
p, li { margin: .6rem 0; }
ul { padding-left: 1.25rem; }
a { color: var(--accent); }
.lead { color: var(--muted); font-size: 1.05rem; margin-bottom: 2rem; }
.meta { color: var(--muted); font-size: .9rem; }
nav { margin-bottom: 2.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
nav a { margin-right: 1.25rem; text-decoration: none; }
footer { margin-top: 3.5rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }