/* Digital Art Exhibition – gallery presentation */

:root {
  --ex-fade: 5500ms;
  --ex-exhale: 16s;
  --ex-kanji-exhale: 20s;
  --ex-kanji: clamp(4.5rem, 16vw, 10rem);
  --ex-text: #f3ede3;
  --ex-muted: rgba(243, 237, 227, 0.68);
  --ex-accent: #c9b48a;
  --ken-burns-duration: 300s;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: var(--ex-text);
  font-family: "Noto Serif JP", "Yuji Mai", Georgia, serif;
}

.exhibition-root {
  position: fixed;
  inset: 0;
  background: #000;
  isolation: isolate;
}

/* ── Black curtain (between exhibits) ── */

.exhibition-veil {
  position: absolute;
  inset: 0;
  z-index: 5;
  background: #000;
  opacity: 1;
  pointer-events: none;
  transition: opacity var(--ex-fade) ease-in-out;
}

.exhibition-veil.is-clear {
  opacity: 0;
}

/* ── Artwork (permanent anchor) ── */

.exhibition-artwork {
  position: absolute;
  inset: -6%;
  z-index: 1;
  overflow: hidden;
  opacity: 0;
  transition: opacity var(--ex-fade) ease-in-out;
}

.exhibition-artwork.is-visible {
  opacity: 1;
}

.exhibition-artwork.is-exhaling {
  transition-duration: var(--ex-exhale, 16s);
  transition-timing-function: ease-in;
  opacity: 0;
}

.exhibition-artwork img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(0.96) contrast(1.02);
}

.exhibition-artwork img.ken-burns {
  animation: exhibition-drift var(--ken-burns-duration, 300s) ease-in-out infinite alternate;
}

.exhibition-root.is-paused .exhibition-artwork img.ken-burns {
  animation-play-state: paused;
}

@keyframes exhibition-drift {
  from {
    transform: scale(1.02) translate(0, 0);
  }
  to {
    transform: scale(1.1) translate(-1.2%, -0.8%);
  }
}

.exhibition-vignette {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(ellipse at center, transparent 42%, rgba(0, 0, 0, 0.38) 100%);
}

/* ── Gallery entrance / exit marker (gold foil bookend artwork) ── */

.exhibition-bookend {
  position: fixed;
  inset: 0;
  z-index: 6;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--ex-bookend-fade, 5500ms) ease-in-out;
}

.exhibition-bookend.is-visible {
  opacity: 1;
}

.exhibition-bookend.is-exhaling {
  transition-duration: var(--ex-bookend-exhale, 16s);
  transition-timing-function: ease-in;
  opacity: 0;
}

.exhibition-bookend img {
  max-width: min(78vw, 560px);
  max-height: min(82vh, 760px);
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  filter: drop-shadow(0 8px 32px rgba(0, 0, 0, 0.55));
}

/* ── Title card (kanji + keyword) ── */

.exhibition-title {
  position: absolute;
  z-index: 3;
  top: clamp(2rem, 10vh, 5rem);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  width: min(90vw, 720px);
  pointer-events: none;
}


.exhibition-kanji {
  color: #f3ede3 !important;
  text-shadow:
      0 0 20px rgba(243,237,227,0.25),
      0 0 40px rgba(243,237,227,0.12);
  font-family: "Yuji Syuku", "Noto Serif JP", serif;
  font-size: var(--ex-kanji);
  font-weight: 400;
  line-height: 1;
  letter-spacing: 0.06em;
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity var(--ex-fade) ease-in-out,
    transform var(--ex-fade) ease-in-out;
}

.exhibition-kanji.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.exhibition-kanji.is-exhaling {
  transition-duration: var(--ex-kanji-exhale, 20s);
  transition-timing-function: ease-in;
  opacity: 0;
  transform: translateY(-6px);
}

.exhibition-kanji.is-floating,
.exhibition-kanji.is-on-black {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 6;
  text-shadow: 0 0 48px rgba(255, 255, 255, 0.06);
}

.exhibition-kanji.is-floating.is-visible {
  transform: translate(-50%, -50%);
}

.exhibition-kanji.is-floating.is-exhaling {
  transform: translate(-50%, -52%);
}

.exhibition-keyword {
  margin-top: 0.75rem;
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  letter-spacing: 0.28em;
  text-transform: lowercase;
  color: var(--ex-accent);
  opacity: 0;
  transition: opacity var(--ex-keyword-fade, var(--ex-fade)) ease-in-out;
}

.exhibition-keyword.is-visible {
  opacity: 0.92;
}

.exhibition-root.is-fixed-kanji .exhibition-keyword.is-visible {
  opacity: 1;
  text-shadow:
    0 2px 14px rgba(0, 0, 0, 0.9),
    0 0 24px rgba(0, 0, 0, 0.65);
}

/* ── Curator's notes (verses) ── */

.exhibition-notes {
  position: absolute;
  z-index: 3;
  top: 52%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(88vw, 760px);
  text-align: center;
  pointer-events: none;
}

.exhibition-verse-jp {
  margin: 0;
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  line-height: 1.85;
  opacity: 0;
  transform: translateY(10px);
  transition:
    opacity var(--ex-fade) ease-in-out,
    transform var(--ex-fade) ease-in-out;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.8);
}

.exhibition-verse-jp.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.exhibition-verse-jp ruby rt {
  opacity: 0;
}

.exhibition-verse-en {
  margin: 1.1rem 0 0;
  font-size: clamp(0.88rem, 1.9vw, 1.02rem);
  line-height: 1.7;
  color: var(--ex-muted);
  font-style: italic;
  white-space: pre-line;
  opacity: 0;
  transition: opacity var(--ex-fade) ease-in-out;
}

.exhibition-verse-en.is-visible {
  opacity: 1;
}

/* ── Boot / error (hidden after start) ── */

.exhibition-loading,
.exhibition-error {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  background: #000;
  color: rgba(243, 237, 227, 0.5);
}

.exhibition-error {
  color: #d4a0a0;
}

/* ── Autoplay gate ── */

.exhibition-autoplay-gate {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  margin: 0;
  padding: 2rem;
  border: 0;
  background: rgba(0, 0, 0, 0.72);
  color: rgba(243, 237, 227, 0.82);
  font: inherit;
  font-size: clamp(0.95rem, 2.4vw, 1.15rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 600ms ease-in-out;
}

.exhibition-autoplay-gate.is-visible {
  opacity: 1;
}

.exhibition-autoplay-gate:focus-visible {
  outline: 1px solid rgba(201, 180, 138, 0.55);
  outline-offset: -6px;
}

.exhibition-hidden {
  display: none !important;
}

/* ── Fixed kanji mode (opacity-only text; no drift or floating) ── */

.exhibition-root.is-fixed-kanji .exhibition-kanji {
  transform: none;
  transition: opacity var(--ex-fade) ease-in-out;
}

.exhibition-root.is-fixed-kanji .exhibition-kanji.is-visible {
  opacity: 1;
  transform: none;
}

.exhibition-root.is-fixed-kanji .exhibition-kanji.is-exhaling {
  opacity: 0;
  transform: none;
  transition-duration: var(--ex-kanji-exhale, 20s);
  transition-timing-function: ease-in-out;
}

.exhibition-root.is-fixed-kanji .exhibition-kanji.is-on-black.is-visible,
.exhibition-root.is-fixed-kanji .exhibition-kanji.is-on-black.is-exhaling {
  transform: translate(-50%, -50%);
}

.exhibition-root.is-fixed-kanji .exhibition-verse-jp {
  transform: none;
  transition: opacity var(--ex-fade) ease-in-out;
}

.exhibition-root.is-fixed-kanji .exhibition-verse-jp.is-visible {
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .exhibition-artwork img.ken-burns {
    animation: none;
  }

  .exhibition-artwork,
  .exhibition-bookend,
  .exhibition-kanji,
  .exhibition-keyword,
  .exhibition-verse-jp,
  .exhibition-verse-en,
  .exhibition-veil {
    transition-duration: 0.01ms !important;
  }
}