:root {
  color-scheme: light dark;
  --background: #f3f6fa;
  --surface: #fff;
  --ink: #18232e;
  --muted: #5c6875;
  --accent: #066b91;
  --border: #dce4ed;
  --selected: #edf8fc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font: 1rem/1.75 system-ui, -apple-system, "Segoe UI", sans-serif;
  overflow-wrap: anywhere;
}
main { max-width: 880px; min-height: 100vh; margin-inline: auto; padding: 42px clamp(20px, 5vw, 56px) 60px; background: var(--surface); }
.brand { margin: 0 0 22px; font-size: 1.125rem; font-weight: 700; color: var(--accent); }
.brand span { font-size: .8rem; letter-spacing: .04em; font-weight: 500; }
h1 { margin: 0 0 12px; font-size: clamp(1.9rem, 5.5vw, 2.6rem); line-height: 1.3; }
h2 { margin: 32px 0 8px; font-size: 1.25rem; line-height: 1.5; }
p { margin: 0 0 16px; }
.muted { color: var(--muted); font-size: .9rem; }
code { font-size: .85rem; }
a { color: var(--accent); text-underline-offset: .2em; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
[aria-current="page"] { background: var(--selected); font-weight: 650; }
.document-nav { display: flex; flex-wrap: wrap; gap: 12px; padding-block: 0 12px; border-bottom: 1px solid var(--border); }
.document-nav a { padding: 10px 14px; border: 1px solid var(--border); border-radius: 10px; min-height: 48px; text-decoration: none; }
footer { margin-top: 40px; border-top: 1px solid var(--border); color: var(--muted); }
footer h2 { font-size: 1.1rem; }
@media (max-width: 480px) { main { padding-top: 28px; } .document-nav a { flex: 1 1 100%; } }
@media (prefers-color-scheme: dark) {
  :root { --background: #101820; --surface: #19232e; --ink: #edf4fa; --muted: #b9c8d5; --accent: #85d5f2; --border: #374654; --selected: #203b4b; }
}
@media print {
  :root { --surface: #fff; --ink: #000; --muted: #333; --accent: #000; }
  main { max-width: none; padding: 0; }
  .document-nav { display: none; }
  h2 { break-after: avoid; }
}