:root { color-scheme: light dark; --ink: #081828; --muted: #5b6573; --bg: #ffffff; --link: #0b63ce; }
@media (prefers-color-scheme: dark) { :root { --ink: #eef1f5; --muted: #9aa4b2; --bg: #0f141a; --link: #6aa9ff; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
h1 { font-size: 34px; line-height: 1.2; margin: 8px 0 4px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
p, ul { margin: 0 0 12px; }
ul { padding-left: 22px; }
a { color: var(--link); }
.crumb, .muted, .foot { color: var(--muted); font-size: 14px; }
.foot { margin-top: 40px; }