:root {
  --bg: #ffffff; --fg: #1a1a1a; --muted: #5c5c5c;
  --rule: #e4e4e4; --accent: #1a5fb4;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14161a; --fg: #e8e8e8; --muted: #a0a4ab;
    --rule: #2a2e35; --accent: #7aa8e8;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding: 0 16px;
}
main { max-width: 680px; margin: 0 auto; padding: 56px 0 80px; }
h1 { font-size: 1.75rem; line-height: 1.25; margin: 0 0 .25em; letter-spacing: -.01em; }
h2 { font-size: 1.05rem; margin: 2.2em 0 .5em; letter-spacing: -.005em; }
.sub { color: var(--muted); margin: 0 0 2.5em; }
p, li { color: var(--fg); }
ul { padding-left: 1.2em; }
li { margin: .35em 0; }
a { color: var(--accent); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em;
       background: color-mix(in srgb, var(--fg) 8%, transparent); padding: .1em .35em; border-radius: 3px; }
footer { border-top: 1px solid var(--rule); margin-top: 3.5em; padding-top: 1.2em;
         color: var(--muted); font-size: .875rem; }
footer a { margin-right: 1em; }