.masthead { padding-top: 1.15rem; background: var(--brick); color: var(--white); --focus: var(--white); }
.masthead-top { display: flex; justify-content: space-between; align-items: center; gap: 2rem; padding-bottom: .85rem; }
.site-name { display: inline-flex; flex-wrap: wrap; align-items: baseline; gap: .25rem .8rem; min-height: 48px; color: inherit; text-decoration: none; }
.site-name strong { font-family: var(--display); font-size: 1.85rem; font-weight: 400; line-height: 1.15; }
.site-name span { font-size: 1.05rem; }
.guide-label { max-width: 20rem; font-size: 1rem; line-height: 1.4; text-align: right; }
.page-rail { display: flex; flex-wrap: wrap; gap: .15rem 1.3rem; border-top: 2px solid currentColor; }
.page-rail a { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; min-width: 44px; padding: .55rem .1rem; color: inherit; font-size: 1rem; text-decoration: none; border-bottom: 4px solid transparent; }
.page-rail a:hover, .page-rail a[aria-current='page'] { border-color: currentColor; }
.page-rail a[aria-current='page'] { font-weight: 600; }
.reading-layout { display: grid; grid-template-columns: 11rem minmax(0, 44rem); gap: 4rem; justify-content: center; width: min(100% - 3rem, 72rem); margin-inline: auto; padding-block: 3.5rem 4.5rem; }
.anchor-rail { align-self: start; position: sticky; top: 1.5rem; border-top: 4px solid var(--brick); padding-top: .7rem; }
.anchor-rail p { color: var(--muted); font-size: 1rem; margin-bottom: .5rem; }
.anchor-rail a { display: flex; align-items: center; min-height: 48px; padding: .5rem 0; font-size: 1rem; }
.anchor-rail a:hover { color: var(--ink); }
.site-footer { border-top: 4px solid var(--brick); background: #e6efef; padding: 2rem 0; }
.footer-content { display: flex; align-items: start; justify-content: space-between; gap: 1rem 2rem; }
.footer-content p { max-width: 47rem; font-size: 1rem; color: var(--muted); }
.footer-links { display: flex; flex-wrap: wrap; gap: .5rem 1rem; flex-shrink: 0; }
.footer-links a { display: inline-flex; align-items: center; min-height: 48px; font-size: 1rem; padding: .4rem .3rem; }
@media (max-width: 1000px) {
  .reading-layout { grid-template-columns: minmax(0, 44rem); gap: 2rem; }
  .anchor-rail { position: static; display: flex; flex-wrap: wrap; gap: 0 1.3rem; padding-block: .6rem; border-bottom: 2px solid var(--line); }
  .anchor-rail p { width: 100%; margin: 0; }
  .anchor-rail a { padding-block: .4rem; }
  .footer-content { flex-wrap: wrap; }
}
@media (max-width: 640px) {
  .masthead { padding-top: 1rem; }
  .masthead-top { flex-wrap: wrap; gap: .6rem; padding-bottom: 1rem; }
  .site-name { flex-basis: 100%; gap: .3rem .7rem; }
  .site-name strong { font-size: 1.8rem; }
  .guide-label { max-width: 24rem; text-align: left; }
  .page-rail { gap: 0 1.1rem; }
  .page-rail a { padding-inline: .1rem; }
  .reading-layout { width: calc(100% - 2.5rem); padding-block: 2rem 3rem; }
}