/* ============================================================
   THE GLASS MUSEUM — Bhanu Build-Tech  ·  3D fly-through edition
   Stage 0: outside, one glowing window at night.
   Stage 1: a sticky Cycles-rendered hall scrubbed by scroll;
   nine backlit niches glide past, each with a floating plaque.
   ============================================================ */

:root {
  --copper: oklch(0.68 0.13 48);
  --copper-glow: oklch(0.74 0.13 55);
  --navy-0: oklch(0.16 0.04 252);
  --room-dark: #100c09;
  --ink: oklch(0.92 0.022 80);
  --ink-dim: oklch(0.66 0.03 72);
  --card: #f3ecdf;            /* museum label stock */
  --card-ink: #2a241c;
  --card-dim: #6c6253;
  --font-display: "Archivo", sans-serif;
  --font-body: "Schibsted Grotesk", sans-serif;
  --font-mono: "Fragment Mono", monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --enter-ease: cubic-bezier(0.65, 0, 0.18, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: auto; }
html, body { height: 100%; }
body.museum-body {
  background: var(--room-dark);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
/* lock scroll until the visitor enters */
body:not(.entered) { overflow: hidden; height: 100%; }

.mono { font-family: var(--font-mono); letter-spacing: 0.16em; font-size: 0.6rem; }

.skip-link {
  position: absolute; left: -9999px; z-index: 300;
  background: var(--copper); color: var(--navy-0);
  padding: 0.6rem 1rem; text-decoration: none;
}
.skip-link:focus { left: 1rem; top: 1rem; }

.sr-collection {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap;
}

/* film grain */
body.museum-body::after {
  content: "";
  position: fixed; inset: -50%;
  width: 200%; height: 200%;
  pointer-events: none; z-index: 250;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 8s steps(10) infinite;
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  20% { transform: translate(-3%, 2%); }
  40% { transform: translate(2%, -3%); }
  60% { transform: translate(-2%, -2%); }
  80% { transform: translate(3%, 3%); }
}

/* ============ STAGE 0 · OUTSIDE ============ */
.entry {
  position: fixed; inset: 0; z-index: 100;
  display: flex; align-items: flex-end; justify-content: center;
  overflow: hidden;
  transform-origin: 50% 46%;
  transition:
    transform 1.9s var(--enter-ease),
    opacity 1.4s ease 0.45s,
    filter 1.9s var(--enter-ease);
}
.entry__bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover; object-position: 50% 42%;
}
.entry__veil {
  position: absolute; inset: 0;
  background:
    radial-gradient(54% 60% at 50% 44%, transparent 30%, rgba(4, 5, 9, 0.55) 100%),
    linear-gradient(to top, rgba(4, 5, 9, 0.88) 0%, rgba(4, 5, 9, 0.25) 36%, transparent 60%);
}
.entry__content {
  position: relative; z-index: 2;
  text-align: center;
  padding-bottom: clamp(3rem, 9vh, 6.5rem);
  max-width: 36rem;
}
.entry__kicker { color: var(--ink-dim); }
.entry__title {
  font-family: var(--font-display);
  font-weight: 640; font-stretch: 115%;
  font-size: clamp(2.6rem, 6.4vw, 4.6rem);
  line-height: 1.02; letter-spacing: -0.02em;
  margin-top: 1rem;
}
.entry__title em { font-style: italic; color: var(--copper-glow); }
.entry__sub {
  color: var(--ink-dim);
  margin-top: 1rem; font-size: 1rem; line-height: 1.7;
}
.entry__btn {
  display: inline-flex; align-items: center; gap: 0.7rem;
  margin-top: 2.2rem;
  font-family: var(--font-body);
  font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--copper-glow);
  background: oklch(0.16 0.04 252 / 0.42);
  border: 1px solid color-mix(in oklch, var(--copper) 75%, transparent);
  border-radius: 2px;
  padding: 1rem 2.3rem;
  cursor: pointer;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background 0.45s, color 0.45s, border-color 0.45s, transform 0.35s var(--ease-out), opacity 0.4s;
}
.entry__btn[disabled] { opacity: 0.55; cursor: progress; }
.entry__btn:not([disabled]):hover,
.entry__btn:not([disabled]):focus-visible {
  background: var(--copper);
  color: var(--navy-0);
  border-color: var(--copper);
  transform: translateY(-2px);
}
.entry__btn svg { transition: transform 0.35s var(--ease-out); }
.entry__btn:not([disabled]):hover svg { transform: translateX(4px); }

.entry__loadbar {
  width: 12rem; max-width: 60vw;
  height: 1px; margin: 1.4rem auto 0;
  background: rgba(243, 236, 223, 0.16);
  overflow: hidden;
}
.entry__loadbar span {
  display: block; height: 100%; width: 0%;
  background: var(--copper-glow);
  transition: width 0.25s ease;
}
body.entered .entry__loadbar { opacity: 0; }

body.entered .entry {
  transform: scale(3.1);
  opacity: 0;
  filter: brightness(1.7) blur(8px);
  pointer-events: none;
}

/* ============ STAGE 1 · THE HALL ============ */
.museum {
  position: relative; z-index: 50;
  opacity: 0;
  transition: opacity 1.5s ease 0.5s;
}
body.entered .museum { opacity: 1; }

.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 30; }
.museum-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.1rem clamp(1.4rem, 4vw, 3rem);
  background: linear-gradient(to bottom, rgba(16, 12, 9, 0.62), transparent);
}
.museum-nav__back, .museum-nav__contact {
  display: inline-flex; align-items: center; gap: 0.5rem;
  color: oklch(0.95 0.02 80); text-decoration: none;
  font-size: 0.68rem; letter-spacing: 0.18em; text-transform: uppercase;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.7);
  transition: color 0.35s;
}
.museum-nav__back:hover, .museum-nav__contact:hover { color: var(--copper-glow); }
.museum-nav__contact {
  color: var(--copper-glow);
  border: 1px solid color-mix(in oklch, var(--copper) 65%, transparent);
  border-radius: 2px;
  padding: 0.55rem 1.3rem;
  background: rgba(16, 12, 9, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.35s, background 0.35s, color 0.35s;
}
.museum-nav__contact:hover {
  border-color: var(--copper);
  background: var(--copper);
  color: var(--navy-0);
}
.museum-nav__logo img { display: block; filter: drop-shadow(0 1px 8px rgba(0, 0, 0, 0.6)); }

/* ---- sticky stage ---- */
.stage {
  position: sticky; top: 0;
  height: 100svh;
  width: 100%;
  overflow: hidden;
  background: var(--room-dark);
}
.stage__canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
}
.stage__vignette {
  position: absolute; inset: 0; pointer-events: none; z-index: 4;
  background:
    radial-gradient(120% 90% at 50% 42%, transparent 52%, rgba(8, 6, 4, 0.55) 100%);
}

/* the scroll spacer that drives playback (height set in JS) */
.scroll-track { position: relative; width: 100%; }

/* ---- floating plaques ---- */
.plaques { position: absolute; inset: 0; z-index: 6; pointer-events: none; }
.plaque {
  position: absolute;
  left: clamp(1.4rem, 5vw, 5.5rem);
  top: 50%;
  width: 17.5rem; max-width: 78vw;
  transform: translateY(-42%) translateX(-14px);
  background: color-mix(in oklab, var(--card) 96%, transparent);
  color: var(--card-ink);
  border-radius: 2px;
  padding: 1.2rem 1.3rem 1.3rem;
  box-shadow: 0 18px 50px rgba(10, 5, 2, 0.55);
  opacity: 0; pointer-events: none;
  transition: opacity 0.5s ease, transform 0.7s var(--ease-out);
}
.plaque::before {
  content: ""; position: absolute; left: 0; top: 1.2rem; bottom: 1.2rem;
  width: 2px; background: var(--copper);
}
.plaque.is-active {
  opacity: 1;
  transform: translateY(-42%) translateX(0);
}
.plaque__title {
  font-family: var(--font-display);
  font-weight: 620; font-stretch: 110%;
  font-size: 1.18rem; line-height: 1.1;
  color: var(--card-ink);
}
.plaque__meta { color: var(--card-dim); margin-top: 0.45rem; font-size: 0.56rem; }
.plaque__desc {
  font-size: 0.84rem; line-height: 1.6;
  color: #463e31; margin-top: 0.85rem;
}

/* ---- closing commission panel ---- */
.cta {
  position: absolute; z-index: 7;
  left: 50%; top: 50%;
  transform: translate(-50%, -44%) scale(0.97);
  width: 26rem; max-width: 86vw;
  text-align: center;
  background: color-mix(in oklab, var(--card) 97%, transparent);
  color: var(--card-ink);
  border-radius: 3px;
  padding: 2.4rem 2.2rem 2.6rem;
  box-shadow: 0 24px 70px rgba(10, 5, 2, 0.6);
  opacity: 0; pointer-events: none;
  transition: opacity 0.6s ease, transform 0.8s var(--ease-out);
}
.cta.is-active { opacity: 1; transform: translate(-50%, -50%) scale(1); pointer-events: auto; }
.cta__kicker { color: #8a6a3f; }
.cta__title {
  font-family: var(--font-display);
  font-weight: 660; font-stretch: 112%;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.05; letter-spacing: -0.01em;
  margin-top: 0.8rem; color: var(--card-ink);
}
.cta__body { font-size: 0.9rem; line-height: 1.65; color: #463e31; margin: 0.9rem auto 0; max-width: 22rem; }
.cta__btn {
  display: inline-block; margin-top: 1.5rem;
  text-decoration: none;
  font-size: 0.66rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--card); background: var(--copper);
  border: 1px solid var(--copper); border-radius: 2px;
  padding: 0.95rem 2rem;
  transition: background 0.4s, color 0.4s, border-color 0.4s, transform 0.35s var(--ease-out);
}
.cta__btn:hover, .cta__btn:focus-visible { background: oklch(0.58 0.13 48); border-color: oklch(0.58 0.13 48); transform: translateY(-2px); }

/* ---- scroll cue (fades after first scroll) ---- */
.scrollcue {
  position: absolute; left: 50%; bottom: 4.5vh; z-index: 8;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.6rem;
  color: rgba(243, 236, 223, 0.62);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.8);
  transition: opacity 0.5s ease;
}
.scrollcue__line {
  width: 1px; height: 2.4rem;
  background: linear-gradient(to bottom, var(--copper-glow), transparent);
  animation: cueDrop 1.8s var(--ease-out) infinite;
}
@keyframes cueDrop {
  0% { transform: scaleY(0.2); transform-origin: top; opacity: 0; }
  40% { opacity: 1; }
  100% { transform: scaleY(1); transform-origin: top; opacity: 0; }
}
.scrollcue.is-hidden { opacity: 0; }

/* ---- hud + progress rail ---- */
.wall-hud {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 9;
  display: flex; justify-content: space-between;
  padding: 1rem clamp(1.4rem, 4vw, 3rem);
  color: rgba(243, 236, 223, 0.5);
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.7);
  pointer-events: none;
}
.rail {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 10;
  height: 2px; background: rgba(243, 236, 223, 0.1);
}
.rail span {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(to right, var(--copper), var(--copper-glow));
}

/* ============ REDUCED MOTION / SMALL SCREENS ============ */
@media (prefers-reduced-motion: reduce) {
  .entry, .museum { transition: opacity 0.4s ease; transform: none; filter: none; }
  body.entered .entry { transform: none; filter: none; }
  body.museum-body::after { animation: none; }
  .scrollcue__line { animation: none; }
}

@media (max-width: 760px) {
  .museum-nav__contact { display: none; }
  .wall-hud span:first-child { display: none; }
  .plaque {
    left: 50%; right: auto;
    top: auto; bottom: 9vh;
    transform: translateX(-50%) translateY(14px);
    width: min(24rem, 88vw);
  }
  .plaque.is-active { transform: translateX(-50%) translateY(0); }
  .plaque::before { display: none; }
  .scrollcue { bottom: 7vh; }
}