:root { --paper: #fff; --ink: #111; --ink-soft: #4a4a4a; --red: #e2001a; }
@media (prefers-color-scheme: dark) {
  :root { --paper: #0f0f0f; --ink: #f5f5f5; --ink-soft: #bdbdbd; --red: #ff3b3b; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 19px/1.5 "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 40rem; margin: 0 auto; padding: 3rem 1.25rem 4rem; }
h1 { font-size: 2.6rem; line-height: 1.05; margin: 0 0 .5rem; border-bottom: 4px solid var(--red); padding-bottom: .5rem; }
h2 { font-size: 1.3rem; margin: 2.2rem 0 .4rem; }
p, li { color: var(--ink); }
.soft { color: var(--ink-soft); }
a { color: var(--ink); text-decoration-color: var(--red); text-decoration-thickness: 2px; text-underline-offset: 3px; }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 2px solid var(--ink); font-size: .9rem; }