:root {
  --achtergrond: #f4f3ef;
  --kaart: #e9e7e1;
  --tekst: #171a18;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--tekst);
  background: var(--achtergrond);
  font-family: Arial, Helvetica, sans-serif;
}

main {
  width: 100%;
  padding: 18px;
}

.raster {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px 14px;
}

.kaart {
  min-width: 0;
  cursor: pointer;
  outline: none;
}

.kaart:focus-visible .beeld { outline: 2px solid var(--tekst); outline-offset: 3px; }

.beeld {
  width: 100%;
  aspect-ratio: 1 / 1.08;
  overflow: hidden;
  background: var(--kaart);
}

.beeld img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}

.kaart:hover img { transform: scale(1.025); }

.nummer {
  display: block;
  padding-top: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
}

.galerij {
  width: min(1180px, calc(100% - 28px));
  max-width: none;
  height: min(900px, calc(100% - 28px));
  max-height: none;
  margin: auto;
  padding: 0;
  border: 0;
  background: var(--achtergrond);
}

.galerij::backdrop { background: rgba(10, 12, 11, .82); }

.galerij-kop {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: rgba(244, 243, 239, .96);
}

.galerij-nummer {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .12em;
}

.sluiten {
  width: 38px;
  height: 38px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--tekst);
  cursor: pointer;
  font-size: 30px;
  line-height: 1;
}

.galerij-raster {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 0 8px 8px;
}

.galerij-raster img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--kaart);
}

@media (max-width: 900px) {
  .raster { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  main { padding: 10px; }
  .raster { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 8px; }
  .galerij { width: 100%; height: 100%; }
  .galerij-raster { grid-template-columns: 1fr; }
}