/* =========================================================
   Layout — page shell, section rhythm, generic grids
   ========================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(241, 242, 246, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 16px var(--page-pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--s-6);
  flex-wrap: wrap;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-nav { display: flex; gap: 20px; flex-wrap: wrap; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; }
.site-nav a { text-decoration: none; color: var(--ink-muted); }
.site-nav a:hover { color: var(--accent); }
.site-nav a.is-current { color: var(--accent); font-weight: 600; }

/* ---------- Sections ---------- */

.section {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--page-pad) var(--s-11);
}
.section--hero { padding-top: 88px; padding-bottom: 96px; }

.section__head {
  display: flex;
  gap: var(--s-5);
  align-items: baseline;
  border-top: 1px solid var(--line-strong);
  padding-top: 18px;
  margin-bottom: var(--s-8);
  flex-wrap: wrap;
}
.section__head--tight { margin-bottom: 20px; }
.section__title { font-weight: 700; font-size: clamp(32px, 4vw, 52px); line-height: 1; letter-spacing: -0.035em; }
.section__intro { margin: 0 0 var(--s-8); font-size: 16px; line-height: 1.65; color: var(--ink-muted); max-width: 680px; text-wrap: pretty; }

/* Sub-heading inside a section (e.g. "Process exhibits") */
.subhead {
  display: flex;
  gap: 18px;
  align-items: baseline;
  flex-wrap: wrap;
  margin: var(--s-8) 0 var(--s-6);
  border-top: 1px solid var(--line-strong);
  padding-top: 18px;
}
.subhead p { margin: 0; font-size: 15px; color: var(--ink-muted); max-width: 640px; }

/* ---------- Grids ----------
   .grid is a hairline grid: the 1px gap + background paints the rules,
   so children need no borders of their own. */

.grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.grid--cards   { grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); }
.grid--tiles   { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid--wide    { grid-template-columns: repeat(auto-fit, minmax(330px, 1fr)); }
.grid--metrics { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); border-radius: var(--r-sm); }
.grid--metrics-lg { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); border-radius: var(--r-md); }

/* Plain gapped grids (children carry their own borders) */
.cols { display: grid; gap: var(--s-5); }
.cols--2   { grid-template-columns: repeat(auto-fit, minmax(430px, 1fr)); }
.cols--3   { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.cols--4   { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.cols--media { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--s-4); }
.split { display: grid; gap: 36px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); align-items: start; }
.split--profile { gap: 36px; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }