:root {
  color-scheme: light dark;
  --canvas: #f3f6fa;
  --ink: #152b42;
  --muted: #435b72;
  --accent: #006a8c;
  --rule: #bacbd9;
  --focus: #006a8c;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--canvas); color: var(--ink); line-height: 1.7; }
a { color: var(--accent); text-underline-offset: 0.2em; overflow-wrap: anywhere; }
a:hover { text-decoration-thickness: 0.15em; }
a:focus-visible { outline: 3px solid var(--focus); outline-offset: 5px; border-radius: 2px; }
.skip-link { position: absolute; top: -6rem; left: 1rem; padding: 0.75rem; background: var(--canvas); }
.skip-link:focus { top: 0.5rem; }
.shell { max-width: 76ch; margin-inline: auto; padding-inline: clamp(1.25rem, 5vw, 3rem); }
header { border-bottom: 1px solid var(--rule); }
header nav { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem 1.5rem; padding-block: 1.25rem; }
header nav a { display: inline-flex; align-items: center; min-height: 44px; }
.brand { color: var(--ink); font-size: 1.35rem; font-weight: 750; text-decoration: none; margin-right: auto; }
header nav [aria-current="page"] { font-weight: 700; text-decoration-thickness: 0.15em; }
main { padding-block: clamp(2.5rem, 7vw, 5rem); }
h1, h2, h3 { line-height: 1.2; text-wrap: balance; }
h1 { font-size: clamp(2.25rem, 7vw, 3.75rem); letter-spacing: -0.035em; margin: 0 0 1.25rem; }
h2 { font-size: 1.45rem; margin: 2.75rem 0 0.75rem; }
h3 { font-size: 1.1rem; margin: 1.75rem 0 0.5rem; }
p, ul, ol { margin: 0 0 1.1rem; }
ul, ol { padding-left: 1.5rem; }
li { margin-block: 0.5rem; padding-left: 0.2rem; }
.lead { font-size: 1.2rem; color: var(--muted); }
.updated, footer { font-size: 0.95rem; color: var(--muted); }
.contents { padding-block: 1rem; border-block: 1px solid var(--rule); margin-block: 2rem; }
.contents p { margin-bottom: 0.5rem; font-weight: 650; }
.contents ul { margin-bottom: 0; }
.resources { list-style: none; padding: 0; margin-top: 2.5rem; border-top: 1px solid var(--rule); }
.resources li { padding: 1.5rem 0; margin: 0; border-bottom: 1px solid var(--rule); }
.resources a { font-size: 1.35rem; font-weight: 650; }
.resources p { margin: 0.4rem 0 0; color: var(--muted); }
footer { border-top: 1px solid var(--rule); padding-block: 1.5rem 2.5rem; }
footer p { margin-bottom: 0.5rem; }

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #071321;
    --ink: #edf4fa;
    --muted: #b6cadd;
    --accent: #63dcf5;
    --rule: #3a526a;
    --focus: #63dcf5;
  }
}