:root { --bg: #fbfaf7; --text: #1f2328; --muted: #5d6470; --link: #0b5cad; --button: #0b5cad; --button-text: #fff; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #16181c; --text: #e6e8eb; --muted: #a2a9b4; --link: #7db5f5; --button: #3b82d6; --button-text: #fff; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "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 12px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
a { color: var(--link); }
li { margin-bottom: 8px; }
.lead { font-size: 1.15rem; }
.small { color: var(--muted); font-size: 0.9rem; }
.button { display: inline-block; margin: 8px 0; padding: 10px 18px; border-radius: 6px; background: var(--button);
  color: var(--button-text); text-decoration: none; font-weight: 600; }