/* Walkthrough mode: a full-screen, hands-free tour of every exhibit, made
   for the monitor outside the classroom. See walkthrough.js. */

.wt-start {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 40;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border: none;
  border-radius: 999px;
  background: var(--ink);
  color: #fff;
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s;
}
.wt-start:hover {
  transform: translateY(-2px);
}
.wt-start:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}
body.wt-on .wt-start {
  display: none;
}

/* ---------- the stage ---------- */

.wt {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(300px, 27vw, 540px);
  gap: clamp(24px, 3vw, 64px);
  padding: clamp(20px, 4vh, 56px) clamp(24px, 3.5vw, 72px) clamp(28px, 5vh, 64px);
  background: var(--wall);
  opacity: 0;
  transition: opacity 0.6s;
  cursor: none;
}
.wt[hidden] {
  display: none;
}
.wt.on {
  opacity: 1;
}

.wt-media {
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.wt-frame {
  flex: 1;
  min-height: 0;
  padding: clamp(10px, 1.5vh, 20px);
  background: var(--frame);
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.12),
    0 20px 50px rgba(0, 0, 0, 0.22);
}
.wt-mat {
  position: relative;
  height: 100%;
  overflow: hidden;
  background: var(--mat);
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.08),
    inset 0 3px 10px rgba(0, 0, 0, 0.12);
}
/* two layers so one picture can slide out as the next slides in */
.wt-layer {
  position: absolute;
  inset: 5%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateX(5%);
  transition:
    opacity 0.8s,
    transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.wt-layer.in {
  opacity: 1;
  transform: none;
}
.wt-layer.out {
  opacity: 0;
  transform: translateX(-5%);
}
/* fill the mat (scaling small clips and photos up), keeping proportions */
.wt-layer img,
.wt-layer video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.wt-caption {
  margin: clamp(10px, 1.6vh, 20px) 0 0;
  color: var(--muted);
  font-size: clamp(12px, 1.5vh, 18px);
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: opacity 0.4s;
}

/* ---------- the label beside it ---------- */

.wt-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 0;
  transition: opacity 0.5s;
}
.wt-info.fading {
  opacity: 0;
}
.wt-label {
  overflow: hidden;
  padding: clamp(20px, 3vh, 40px) clamp(20px, 2vw, 36px);
  background: var(--label);
  border-left: 8px solid var(--accent);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}
.wt-no {
  margin: 0;
  color: var(--muted);
  font-size: clamp(12px, 1.5vh, 18px);
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.wt-title {
  margin: 6px 0 0;
  font-size: clamp(26px, 4.2vh, 56px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.wt-artist {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 2.2vh, 28px);
  font-weight: 600;
}
.wt-label h3 {
  margin: clamp(14px, 2.4vh, 30px) 0 8px;
  color: var(--blue);
  font-size: clamp(11px, 1.3vh, 16px);
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.wt-label ol,
.wt-label ul {
  margin: 0;
  padding-left: 1.4em;
  font-size: clamp(14px, 1.95vh, 24px);
  line-height: 1.4;
}
.wt-label li {
  margin: 0.25em 0;
}
.wt-label li::marker {
  font-weight: 700;
  color: var(--muted);
}
.wt-note {
  margin: 0.8em 0 0;
  color: #4a4944;
  font-size: clamp(13px, 1.7vh, 20px);
  font-style: italic;
}

/* progress along the bottom edge */
.wt-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: var(--rule);
}
.wt-progress i {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.6s;
}

/* operator hint: shows briefly at the start and whenever the mouse moves */
.wt-hint {
  position: fixed;
  top: 14px;
  left: 50%;
  z-index: 70;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(20, 18, 16, 0.8);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.wt-hint.on {
  opacity: 1;
}

/* ---------- the closing card ---------- */

/* soften the page behind the card; strongest in the middle so the footer
   at the bottom stays readable */
.wt-veil {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: radial-gradient(ellipse 70% 55% at 50% 45%, rgba(244, 241, 234, 0.92), rgba(244, 241, 234, 0.55) 70%, rgba(244, 241, 234, 0) 100%);
  opacity: 0;
  transition: opacity 1.4s;
  pointer-events: none;
}
.wt-veil.on {
  opacity: 1;
}

.wt-end {
  position: fixed;
  left: 50%;
  top: 46%;
  z-index: 60;
  display: flex;
  align-items: center;
  gap: clamp(20px, 2.5vw, 48px);
  padding: clamp(24px, 4vh, 52px) clamp(28px, 3vw, 60px);
  background: rgba(255, 255, 255, 0.97);
  border-left: 10px solid var(--accent);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
  opacity: 0;
  transform: translate(-50%, -44%);
  transition:
    opacity 1.4s,
    transform 1.4s cubic-bezier(0.2, 0.8, 0.2, 1);
  pointer-events: none;
}
.wt-end[hidden] {
  display: none;
}
.wt-end.on {
  opacity: 1;
  transform: translate(-50%, -50%);
}
.wt-end img {
  width: clamp(120px, 18vh, 240px);
  height: auto;
}
.wt-end .k {
  margin: 0;
  color: var(--muted);
  font-size: clamp(13px, 1.8vh, 22px);
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.wt-end .url {
  margin: 8px 0 6px;
  font-size: clamp(24px, 4vh, 54px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.wt-end .sub {
  margin: 0;
  color: #3b3a37;
  font-size: clamp(14px, 1.9vh, 22px);
}
body.wt-on {
  cursor: none;
}

/* portrait screens: picture on top, label underneath */
@media (orientation: portrait) {
  .wt {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1.6fr) minmax(0, 1fr);
  }
  .wt-info {
    justify-content: flex-start;
  }
  .wt-end {
    flex-direction: column;
    text-align: center;
  }
  .wt-end .url {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .wt-layer,
  .wt-layer.out {
    transform: none;
  }
}