:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #fafafa;
  --accent: #3457d5;
  --muted: #6b6b6b;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #e8e8e8; --bg: #14161a; --muted: #9a9a9a; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
}
.wrap { max-width: 640px; margin: 0 auto; padding: 3rem 1.25rem 4rem; }
h1 { font-size: 1.6rem; margin-bottom: 0.25rem; }
.tagline { color: var(--muted); margin-top: 0; }
nav { margin: 1.5rem 0 2.5rem; display: flex; gap: 1.25rem; }
nav a { color: var(--accent); text-decoration: none; font-size: 0.95rem; }
nav a:hover { text-decoration: underline; }
article h2 { font-size: 1.1rem; margin-top: 2rem; }
footer { margin-top: 3rem; color: var(--muted); font-size: 0.85rem; }
code { background: rgba(127,127,127,0.15); padding: 0.1rem 0.35rem; border-radius: 4px; font-size: 0.9em; }