/* Native sticky positioning keeps the header's space in document flow. */
.site-header { position: sticky; top: 0; z-index: 30; isolation: isolate; background: var(--color-paper); }
.site-header::before { content: ""; position: absolute; inset: 0 calc((100vw - 100%) / -2); background: var(--color-paper); z-index: -1; }
:where([id], h1, h2, h3, h4, h5, h6) { scroll-margin-top: calc(var(--sticky-header-height, 104px) + 16px); }

.home .latest-field-notes .section-label { display: flex; flex-direction: row; align-items: center; justify-content: space-between; gap: 24px; }
.home .latest-field-notes .section-label .eyebrow { display: none; }
.home .latest-field-notes .section-label h2 { font-size: 2rem; margin: 0; }
.home .editorial-feed { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.home .editorial-feed .article-card { display: flex; flex-direction: column; align-items: stretch; gap: 0; margin: 0; min-width: 0; }
.home .editorial-feed .article-card-visual { order: 0; width: 100%; aspect-ratio: 4 / 3; min-height: 0; flex: none; }
.home .editorial-feed .article-card-visual img { display: block; width: 100%; height: 100%; min-height: 0; object-fit: cover; }
.home .editorial-feed .article-card-visual > b { left: 14px; right: auto; }
.home .editorial-feed .article-card-copy { display: flex; flex-direction: column; flex: 1; padding-top: 20px; min-width: 0; }
.home .editorial-feed .article-card-meta { flex-wrap: nowrap; gap: 6px; white-space: nowrap; font-size: .6rem; letter-spacing: 0; }
.home .editorial-feed h3 { font-family: Georgia, serif; font-size: clamp(1.375rem, 1.5vw, 1.625rem); line-height: 1.25; word-break: normal; overflow-wrap: normal; hyphens: none; min-height: 3.75em; margin: 16px 0; }
.home .editorial-feed .article-card-copy > p { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden; margin: 0 0 24px; }
.home .editorial-feed .text-link { margin-top: auto; align-self: flex-start; }
@media (min-width: 640px) and (max-width: 1023px) { .home .editorial-feed { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 639px) { .home .editorial-feed { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 480px) {
  .home .home-intro { padding-block: 24px; gap: 24px; min-height: 0; }
  .home .home-intro h1 { max-width: none; font-size: clamp(1rem, 5.3vw, 1.59rem); line-height: 1.3; letter-spacing: -.035em; }
  .home .hero-sentence { display: block; white-space: nowrap; }
  .home .intro-deck { margin-block: 16px; font-size: 1rem; }
  .home .index-search { margin-top: 16px; }
  .home .intro-image { min-height: 0; }
  .home .intro-image img { min-height: 0; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
  .home .intro-image figcaption { font-size: .6rem; gap: 2px; }
}

/* Five columns; preserve native sticky positioning and the menu disclosure. */
@media (min-width: 1201px) {
  .site-header { min-height: 88px; gap: 24px; }
  .navigation nav { flex-wrap: nowrap; gap: clamp(12px, 1.4vw, 24px); }
  .main-nav { font-size: .75rem; }
  .main-nav a { white-space: nowrap; }
}
@media (min-width: 981px) and (max-width: 1200px) {
  .site-header { min-height: 82px; grid-template-columns: 1fr auto; }
  .nav-toggle { display: flex; align-items: center; }
  .navigation { display: none; grid-column: 1 / -1; padding: 18px 0 24px; border-top: 1px solid var(--line); }
  .site-header.nav-open .navigation { display: grid; }
}
@media (max-width: 1200px) {
  .navigation { justify-items: stretch; }
  .navigation .main-nav { flex-direction: column; align-items: flex-start; gap: 0; }
  .main-nav a { padding: 10px 0; }
}
.route-index .route-card { grid-template-columns: 3rem minmax(14rem, 1fr) minmax(0, 1.4fr) auto; }
.hub-group { padding-block: 40px; border-top: 1px solid var(--line); }
.hub-group > h2 { margin-top: 0; }
.hub-group .hub-feed { border-top: 0; padding-block: 24px; }
@media (max-width: 639px) {
  .route-index .route-card { grid-template-columns: 2rem minmax(0, 1fr) auto; }
  .route-index .route-card small { grid-column: 2; }
  .route-index .route-card > span:last-child { grid-column: 3; grid-row: 1 / 3; }
}

/* Article navigation and evidence stay beside the record they describe. */
.article-trust { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: baseline; padding-block: 24px; margin-top: 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
.article-trust a { text-decoration: underline; }
.article-next-step { padding: 28px; margin-block: 24px 0; background: var(--color-paper-2); border: 1px solid var(--line); }
.article-next-step h2 { margin-top: 0; font-size: 1.6rem; }
.article-next-step ul { margin-bottom: 0; padding-left: 20px; }
.article-next-step li + li { margin-top: 12px; }
.figure-label { font-weight: 700; }
.stone-record-field { margin-block: 40px; }
.table-scroll { max-width: 100%; overflow-x: auto; }
@media (max-width: 639px) { .article-next-step { padding: 20px; } }

/* Shared navigation dimensions; opening the mobile menu does not move content. */
.site-header { height: 72px; min-height: 72px; }
.breadcrumb { padding-top: 24px; gap: 8px; font: 400 .875rem/1.5 var(--font-display); }
.breadcrumb > :last-child { white-space: normal; }
:where([id], h1, h2, h3, h4, h5, h6) { scroll-margin-top: 88px; }
@media (min-width: 1280px) { .site-header .navigation { display: grid; }.site-header .nav-toggle { display: none; } }
@media (max-width: 1279px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-header .nav-toggle { display: flex; }
  .site-header .navigation { display: none; position: absolute; top: 72px; right: 0; width: min(360px, calc(100vw - 32px)); max-height: calc(100dvh - 88px); overflow-y: auto; padding: 24px; border: 1px solid var(--line); background: var(--color-paper); }
  .site-header.nav-open .navigation { display: grid; }
  .site-header .main-nav { flex-direction: column; align-items: stretch; gap: 0; }
  .site-header .main-nav a { padding-block: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

.site-header .main-nav { font-family: var(--font-display); font-size: .875rem; font-weight: 600; }

.footer-grid { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr); }
@media (max-width: 767px) { .footer-grid { grid-template-columns: minmax(0, 1fr); } }
.site-header .nav-toggle { gap: 8px; }