:root {
  color-scheme: dark;
  --background: #212529;
  --text: #6c757d;
  --accent: #8957e5;
  --accent-hover: #6f42c1;
  --white: white;
  --reading: #f0f6fc;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--background); color: var(--text); font-family: 'Ubuntu', sans-serif; overflow-wrap: break-word; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 4px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
.page { width: min(1120px, calc(100% - 96px)); min-height: 100vh; min-height: 100svh; margin-inline: auto; display: flex; flex-direction: column; }
main { flex: 1; min-width: 0; }
/* Main navigation and location have separate rows so long titles stay readable. */
.site-header { padding-top: 24px; border-bottom: 1px solid var(--text); }
.header-main { display: flex; justify-content: space-between; align-items: center; gap: 24px; min-width: 0; }
.brand { flex-shrink: 0; font: 28px/1.2 'Ubuntu', sans-serif; letter-spacing: -.04em; color: var(--reading); }
.brand span { color: var(--accent); }
.brand:hover { text-decoration: none; }
.section-nav { display: flex; align-items: center; padding: 4px; gap: 4px; border: 1px solid var(--text); border-radius: 6px; font: 12px/1.5 monospace; }
.section-nav a { display: flex; justify-content: center; align-items: center; min-height: 40px; padding: 8px 16px; border-radius: 3px; }
.section-nav a:hover { color: var(--reading); text-decoration: none; }
.section-nav a[aria-current] { color: var(--white); background: var(--accent); }
.section-nav a[aria-current]:hover { background: var(--accent-hover); }
.section-nav a:focus-visible { outline-offset: 1px; }
.header-trail { display: flex; align-items: center; gap: 12px; padding-block: 20px; min-width: 0; }
.trail-marker { color: var(--accent); font: 24px/1 monospace; flex-shrink: 0; }
.breadcrumbs { min-width: 0; font: 12px/1.6 monospace; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 12px; list-style: none; padding: 0; margin: 0; }
.breadcrumbs li { display: flex; align-items: center; min-width: 0; overflow-wrap: anywhere; }
.breadcrumbs li + li::before { content: '/'; color: var(--accent); margin-right: 12px; flex-shrink: 0; font: 24px/1 'Ubuntu', sans-serif; }
.breadcrumbs [aria-current] { color: var(--reading); }
.breadcrumbs a:hover { color: var(--accent); }
.site-footer { display: flex; justify-content: space-between; align-items: center; gap: 24px; font-family: monospace; }
.site-footer { border-top: 1px solid var(--text); padding-block: 24px; font-size: 12px; line-height: 1.6; }
.site-footer a:hover { color: var(--accent); }
.skip-link { position: absolute; top: 12px; left: 12px; padding: 12px; background: var(--background); color: var(--text); transform: translateY(-200%); z-index: 2; font-family: monospace; }
.skip-link:focus { transform: translateY(0); }
@media (max-width: 800px) { .page { width: calc(100% - 48px); } }
@media (max-width: 600px) {
  .header-main { flex-direction: column; align-items: stretch; gap: 20px; }
  .brand { align-self: flex-start; }
  .section-nav a { flex: 1; padding-inline: 8px; }
  .header-trail { align-items: flex-start; padding-block: 16px; }
}
@media (max-width: 480px) {
  .page { width: calc(100% - 40px); }
  .site-footer { gap: 16px; flex-wrap: wrap; }
}