:root { --bg: #fbfaf8; --ink: #1d2433; --muted: #5b6475; --accent: #3b4a8c; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #14161c; --ink: #e8e9ee; --muted: #a2a8b8; --accent: #9fb0f5; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); }
a { color: var(--accent); }
footer { margin-top: 48px; font-size: 0.9rem; color: var(--muted); }
footer a { margin-right: 16px; }
.yt { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; text-decoration: none; }