/* Lightbox per gallerie (zs-lightbox): schermo pieno scuro, barra in alto con filo, titolo,
 * contatore e chiusura quadrata; foto grande a sinistra, colonna di miniature a due colonne
 * a destra (striscia orizzontale con scroll-snap su mobile).
 * Movimento dalla reference (fonti.json, voce "lightbox"): il pannello compare senza transizione
 * (opacity 0→1 a classe), la foto entra con un fade di ~400 ms; qui il pannello ha 150 ms per non
 * lampeggiare. Miniatura attiva: tinta d'accento con foto in scala di grigi a moltiplica. */
.zs-lightbox {
  --zs-lb-bg: var(--z-ink, color-mix(in srgb,var(--b-primary) 81%,var(--b-text)));
  --zs-lb-ink: var(--z-bg, var(--b-bg));
  --zs-lb-line: var(--z-accent, color-mix(in srgb,var(--b-primary) 81%,var(--b-bg)));
  --zs-lb-gap: .5rem;
  --zs-lb-thumbs: 12.5rem;
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: var(--zs-lb-gap);
  padding: var(--zs-lb-gap);
  background: var(--zs-lb-bg);
  color: var(--zs-lb-ink);
  font-family: var(--b-font-display);
  opacity: 0;
  transition: opacity .15s linear}
.zs-lightbox, .zs-lightbox *, .zs-lightbox *::before, .zs-lightbox *::after { box-sizing: border-box}
.zs-lightbox[hidden] { display: none}
.zs-lightbox.is-open { opacity: 1}

.zs-lightbox__bar {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 1rem;
  min-height: 2.25rem;
  border-top: 1px solid var(--zs-lb-line);
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase}
.zs-lightbox__title {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding-top: .5rem;
  overflow: hidden;
  font:var(--b-font-body);
  white-space: nowrap;
  text-overflow: ellipsis;
  color: var(--zs-lb-line)}
.zs-lightbox__count { padding-top: .5rem; font-variant-numeric: tabular-nums; opacity: .7}
.zs-lightbox__close {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--zs-lb-line);
  border-top: 0;
  background: none;
  color: var(--zs-lb-line);
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease}
.zs-lightbox__close:hover { background: var(--zs-lb-line); color: var(--z-accent-ink, var(--b-bg))}
.zs-lightbox__close svg { width: 1.1rem; height: 1.1rem}

.zs-lightbox__body {
  display: grid;
  grid-template-columns: 1fr var(--zs-lb-thumbs);
  gap: var(--zs-lb-gap);
  min-height: 0}
.zs-lightbox__stage {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 0;
  overflow: hidden;
  touch-action: pan-y pinch-zoom;
  user-select: none}
.zs-lightbox__figure { display: grid; place-items: center; width: 100%; height: 100%; min-height: 0; margin: 0}
.zs-lightbox__img {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity .4s ease-out}
.zs-lightbox__img.is-ready { opacity: 1}
.zs-lightbox__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 40rem;
  margin: 0;
  padding: .5rem .75rem;
  background: var(--zs-lb-bg);
  font-size: .8rem;
  line-height: 1.4}
.zs-lightbox__caption:empty { display: none}

.zs-lightbox__nav {
  position: absolute;
  top: 50%;
  display: grid;
  place-items: center;
  width: 3rem;
  height: 3rem;
  margin-top: -1.5rem;
  padding: 0;
  border: 1px solid currentColor;
  background: color-mix(in srgb, var(--zs-lb-bg) 70%, transparent);
  color: var(--zs-lb-ink);
  cursor: pointer;
  opacity: .85;
  transition: opacity .2s ease, background-color .2s ease}
.zs-lightbox__nav:hover { opacity: 1; background: var(--zs-lb-bg)}
.zs-lightbox__nav[data-dir="-1"] { left: .5rem}
.zs-lightbox__nav[data-dir="1"] { right: .5rem}
.zs-lightbox__nav svg { width: 1.1rem; height: 1.1rem}
.zs-lightbox__nav[disabled] { visibility: hidden}

.zs-lightbox__thumbs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-content: start;
  gap: var(--zs-lb-gap);
  margin: 0;
  padding: 4.5rem 0 0;
  overflow-y: auto;
  list-style: none;
  scrollbar-width: thin}
.zs-lightbox__thumb {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 2 / 3;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  transition: opacity .2s ease}
.zs-lightbox__thumb img { display: block; width: 100%; height: 100%; object-fit: cover}
.zs-lightbox__thumb[aria-current="true"] { background: var(--zs-lb-line)}
.zs-lightbox__thumb[aria-current="true"] img { filter: grayscale(1); mix-blend-mode: multiply}
.zs-lightbox__thumb[aria-current="true"]::after { content: ""; position: absolute; inset: 0; border: 1px solid var(--zs-lb-line)}
@media (hover: hover) { .zs-lightbox__thumb:not([aria-current="true"]):hover { opacity: .6} }

.zs-lightbox :focus-visible { outline: 2px solid var(--zs-lb-ink); outline-offset: 2px}

/* Immagini della galleria che aprono la lightbox */
[data-zs-lightbox] [data-zs-lb-index] { cursor: zoom-in}

@media (max-width: 56rem) {
  .zs-lightbox { padding: 0; gap: 0}
  .zs-lightbox__bar { padding-left: var(--zs-lb-gap)}
  .zs-lightbox__close { border: 0; background: var(--zs-lb-line); color: var(--z-accent-ink, var(--b-bg))}
  .zs-lightbox__body { grid-template-columns: 1fr; grid-template-rows: 1fr auto}
  .zs-lightbox__stage { padding: var(--zs-lb-gap)}
  .zs-lightbox__nav { display: none}
  .zs-lightbox__thumbs {
    display: flex;
    gap: 2px;
    padding: 0 var(--zs-lb-gap) var(--zs-lb-gap);
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-padding: 0 var(--zs-lb-gap)}
  .zs-lightbox__thumbs li { flex: none; width: calc(4.7rem * 2 / 3); scroll-snap-align: start}
  .zs-lightbox__thumb { width: auto; height: 4.7rem; aspect-ratio: 2 / 3}
}

@media (prefers-reduced-motion: reduce) {
  .zs-lightbox, .zs-lightbox__img { transition-duration: .01ms !important}
}