/* ============================================================
   NEXUS — THE BUILDING
   Dark exhibition shell. The paper pages stay in base/pages.css;
   this file only governs the 3D routes.
   ============================================================ */

body[data-theme="dark"] {
  background: #0a0a09;
  color: var(--color-bone, #e8e4da);
  overflow: hidden;
  overscroll-behavior: none;
}

.museum {
  --bone: #e8e4da;
  --bone-soft: rgba(232, 228, 218, 0.66);
  --bone-faint: rgba(232, 228, 218, 0.38);
  --hair: rgba(232, 228, 218, 0.16);
  --hair-soft: rgba(232, 228, 218, 0.08);
  --copper: #763e3c;
  --copper-lit: #b4736e;
  --ink: #0a0a09;
  position: fixed;
  inset: 0;
  overflow: hidden;
  background: #0a0a09;
  color: var(--bone);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  touch-action: none;
}

/* base.css sets headings to ink; inside the building they inherit the bone text. */
.museum h1,
.museum h2,
.museum h3,
.museum h4 {
  color: inherit;
}

.museum-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  outline: none;
}
.museum-canvas:active {
  cursor: grabbing;
}
.museum-canvas:focus-visible {
  outline: 1px solid var(--bone-faint);
  outline-offset: -6px;
}

/* Vignette + a restrained film grain. No bloom, no glass. */
.museum-grade {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
  background:
    radial-gradient(120% 90% at 50% 42%, rgba(0, 0, 0, 0) 38%, rgba(0, 0, 0, 0.55) 100%),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.42) 0%, rgba(0, 0, 0, 0) 22%, rgba(0, 0, 0, 0) 74%, rgba(0, 0, 0, 0.5) 100%);
}
.museum-grade::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* ------------------------------------------------------------------ header */

.museum-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 20px clamp(20px, 3.2vw, 44px) 40px;
  background: linear-gradient(to bottom, rgba(8, 8, 7, 0.82), rgba(8, 8, 7, 0));
  pointer-events: none;
}
.museum-bar > * {
  pointer-events: auto;
}

.museum-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
  justify-self: start;
}
.brand-plaque {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: var(--bone);
}
.brand-plaque img {
  width: 16px;
  height: auto;
  display: block;
}
.museum-brand .brand-word {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.16em;
}

.museum-locator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
  min-width: 200px;
}
.locator-index {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.24em;
  color: var(--bone-faint);
}
.locator-zone {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--bone-soft);
  text-transform: uppercase;
}

.museum-controls {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  justify-self: end;
}
.ctl {
  appearance: none;
  border: 0;
  background: none;
  padding: 6px 0;
  color: var(--bone-soft);
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  position: relative;
  white-space: nowrap;
  transition: color 0.3s var(--ease);
}
.ctl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--bone-faint);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.ctl:hover,
.ctl:focus-visible,
.ctl[aria-pressed="true"] {
  color: var(--bone);
}
.ctl:hover::after,
.ctl:focus-visible::after,
.ctl[aria-pressed="true"]::after,
.ctl.is-on::after {
  transform: scaleX(1);
}

/* ----------------------------------------------------------------- hotspots */

.museum-hotspots {
  position: absolute;
  inset: 0;
  z-index: 12;
  pointer-events: none;
}
.hotspot {
  position: absolute;
  top: 0;
  left: 0;
  transform: translate3d(-50%, -50%, 0);
  pointer-events: auto;
  appearance: none;
  cursor: pointer;
  transition: opacity 0.5s var(--ease), border-color 0.4s var(--ease), background 0.4s var(--ease);
  will-change: transform;
}
.hotspot.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.hotspot--portal {
  min-width: 168px;
  padding: 12px 16px 13px;
  text-align: left;
  border: 1px solid var(--hair);
  border-left: 1px solid var(--bone-faint);
  background: rgba(10, 10, 9, 0.55);
  color: var(--bone);
}
.hotspot--portal::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 22px;
  height: 1px;
  background: var(--bone);
}
.hotspot--portal:hover,
.hotspot--portal:focus-visible {
  background: rgba(232, 228, 218, 0.07);
  border-color: var(--bone-faint);
}
.hotspot--portal.is-sealed {
  color: rgba(232, 228, 218, 0.55);
}
.hotspot--portal .hs-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--bone-faint);
  margin-bottom: 6px;
}
.hotspot--portal .hs-name {
  display: block;
  font-family: var(--font-display);
  font-size: 13.5px;
  letter-spacing: 0.06em;
  line-height: 1.25;
}
.hotspot--portal .hs-act {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper-lit);
}
.hotspot--portal.is-sealed .hs-act {
  color: var(--bone-faint);
}

.hotspot--object {
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--bone);
}
.hotspot-ring {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(232, 228, 218, 0.75);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: radial-gradient(circle, rgba(10, 10, 9, 0.55) 0%, rgba(10, 10, 9, 0.18) 62%, rgba(10, 10, 9, 0) 72%);
  box-shadow: 0 0 22px rgba(10, 10, 9, 0.55);
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease);
}
.hotspot-ring::after {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--bone);
}
.hotspot--object:hover .hotspot-ring,
.hotspot--object:focus-visible .hotspot-ring {
  border-color: var(--bone);
  transform: scale(1.12);
}
/* Annotation callout: ring on the object, hairline, label to the right. */
.hotspot--object::after {
  content: "";
  position: absolute;
  left: 46px;
  top: 50%;
  width: 16px;
  height: 1px;
  background: var(--bone-faint);
}
.hotspot-label {
  position: absolute;
  left: 66px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone);
  white-space: nowrap;
  border-bottom: 1px solid var(--bone-faint);
  padding-bottom: 4px;
  text-shadow: 0 1px 10px rgba(10, 10, 9, 0.9);
}

/* --------------------------------------------------------------------- hero */

.museum-hero {
  position: absolute;
  left: clamp(20px, 7vw, 120px);
  bottom: clamp(90px, 14vh, 150px);
  z-index: 15;
  max-width: min(640px, 78vw);
  transition: opacity 1s var(--ease), transform 1s var(--ease);
}
.museum-hero.is-hidden {
  opacity: 0;
  transform: translateY(18px);
  pointer-events: none;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.26em;
  color: var(--bone-faint);
  margin: 0 0 26px;
}
.museum-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(44px, 6.6vw, 96px);
  line-height: 0.9;
  letter-spacing: -0.012em;
}
.museum-hero h1 span {
  display: block;
}
.museum-hero h1 em {
  display: block;
  font-style: italic;
  font-weight: 300;
  color: var(--bone-soft);
  padding-left: 0.06em;
}
.hero-cn {
  margin: 22px 0 0;
  font-family: var(--font-cn-serif);
  font-size: clamp(15px, 1.4vw, 19px);
  letter-spacing: 0.34em;
  color: var(--bone-soft);
}
.hero-line {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--bone-faint);
  max-width: 34ch;
}

.enter-button {
  margin-top: 38px;
  appearance: none;
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 34px 16px;
  border: 1px solid rgba(232, 228, 218, 0.42);
  background: transparent;
  color: var(--bone);
  cursor: pointer;
  text-align: left;
  transition: background 0.5s var(--ease), color 0.5s var(--ease), border-color 0.5s var(--ease);
}
.enter-button span {
  font-family: var(--font-cn-serif);
  font-size: 14px;
  letter-spacing: 0.24em;
}
.enter-button small {
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.22em;
  color: var(--bone-faint);
  transition: color 0.5s var(--ease);
}
.enter-button:hover,
.enter-button:focus-visible {
  background: var(--bone);
  border-color: var(--bone);
  color: var(--ink);
}
.enter-button:hover small,
.enter-button:focus-visible small {
  color: rgba(10, 10, 9, 0.6);
}

.hero-foot {
  margin: 26px 0 0;
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.2em;
  color: var(--bone-faint);
}
.hero-foot button {
  appearance: none;
  border: 0;
  background: none;
  padding: 0 0 2px;
  color: var(--bone-faint);
  font: inherit;
  letter-spacing: inherit;
  border-bottom: 1px solid var(--hair);
  cursor: pointer;
  text-transform: uppercase;
}
.hero-foot button:hover,
.hero-foot button:focus-visible {
  color: var(--bone);
}

/* ----------------------------------------------------------------- hud bits */

.museum-hint {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  z-index: 14;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bone-faint);
  white-space: nowrap;
  transition: opacity 0.8s var(--ease);
}
.museum-hint.is-hidden {
  opacity: 0;
}

.museum-progress {
  position: absolute;
  left: clamp(20px, 3.2vw, 44px);
  bottom: 26px;
  z-index: 14;
  display: flex;
  align-items: flex-end;
  gap: 14px;
  font-family: var(--font-mono);
}
.progress-label {
  font-size: 8px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bone-faint);
  padding-bottom: 3px;
}
.progress-count {
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.06em;
  line-height: 1;
}
.progress-count i {
  font-style: normal;
  font-size: 10px;
  color: var(--bone-faint);
  padding: 0 2px;
}
.progress-ticks {
  display: flex;
  gap: 5px;
  padding-bottom: 5px;
}
.progress-tick {
  width: 22px;
  height: 1px;
  background: var(--hair);
}
.progress-tick.is-visited {
  background: var(--copper-lit);
}

.museum-return {
  position: absolute;
  right: clamp(20px, 3.2vw, 44px);
  bottom: 24px;
  z-index: 14;
  display: flex;
  gap: 20px;
}
.museum-return button {
  appearance: none;
  border: 0;
  background: none;
  padding: 4px 0;
  color: var(--bone-faint);
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}
.museum-return button:hover,
.museum-return button:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--hair);
}

.museum-toast {
  position: absolute;
  left: 50%;
  bottom: 68px;
  transform: translate(-50%, 10px);
  z-index: 32;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 20px;
  border-left: 1px solid var(--copper-lit);
  background: rgba(12, 12, 11, 0.92);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
  max-width: min(420px, 82vw);
}
.museum-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
.museum-toast strong {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone);
  font-weight: 500;
}
.museum-toast span {
  font-size: 12px;
  color: var(--bone-soft);
}

/* ------------------------------------------------------------------ dossier */

.museum-dossier {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  width: min(540px, 46vw);
  background: rgba(11, 11, 10, 0.95);
  border-left: 1px solid var(--hair);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(100%);
  transition: transform 0.72s var(--ease);
  backdrop-filter: blur(1px);
}
.museum-dossier.is-open {
  transform: translateX(0);
}
.museum-dossier[hidden] {
  display: block;
  visibility: hidden;
}
.dossier-inner {
  padding: clamp(28px, 4.4vw, 52px) clamp(24px, 3.4vw, 46px) 56px;
}
.dossier-head {
  position: relative;
  padding-bottom: 26px;
}
.dossier-eyebrow {
  display: flex;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.18em;
  color: var(--bone-faint);
  text-transform: uppercase;
  padding-right: 44px;
}
.dossier-close {
  position: absolute;
  top: -8px;
  right: 0;
  width: 34px;
  height: 34px;
  border: 1px solid var(--hair);
  background: none;
  color: var(--bone-soft);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}
.dossier-close:hover,
.dossier-close:focus-visible {
  border-color: var(--bone);
  color: var(--bone);
}
.dossier-title-cn {
  margin: 26px 0 6px;
  font-family: var(--font-cn-serif);
  font-weight: 400;
  font-size: clamp(26px, 2.6vw, 34px);
  letter-spacing: 0.14em;
  line-height: 1.3;
}
.dossier-title-en {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(15px, 1.5vw, 19px);
  letter-spacing: 0.1em;
  color: var(--bone-soft);
}

.dossier-ban {
  margin: 28px 0 30px;
  padding: 20px 0 18px;
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}
.ban-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper-lit);
  margin-bottom: 12px;
}
.ban-en {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 25px);
  letter-spacing: 0.06em;
  color: var(--bone);
  line-height: 1.2;
}
.ban-zh {
  margin: 6px 0 0;
  font-family: var(--font-cn-serif);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: var(--bone-soft);
}

.dossier-lead {
  margin: 0 0 22px;
  font-size: 14px;
  line-height: 1.95;
  color: rgba(232, 228, 218, 0.84);
}
.dossier-quote {
  margin: 0 0 34px;
  padding: 4px 0 4px 18px;
  border-left: 1px solid var(--copper);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 17px;
  line-height: 1.6;
  color: var(--bone-soft);
}

.dossier-meta h4,
.dossier-archive h4 {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 8px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bone-faint);
}
.dossier-meta dl {
  margin: 0 0 34px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--hair-soft);
}
.dossier-meta dl > div {
  padding: 12px 12px 12px 0;
  border-bottom: 1px solid var(--hair-soft);
}
.dossier-meta dt {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bone-faint);
  margin-bottom: 6px;
}
.dossier-meta dd {
  margin: 0;
  font-size: 12px;
  line-height: 1.65;
  color: rgba(232, 228, 218, 0.8);
}
.dossier-archive p {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 2;
  color: rgba(232, 228, 218, 0.78);
}
.dossier-foot {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--hair);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.dossier-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--bone);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--hair);
  padding-bottom: 6px;
}
.dossier-link i {
  font-style: normal;
  transition: transform 0.4s var(--ease);
}
.dossier-link:hover i {
  transform: translateX(4px);
}
.dossier-state {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--bone-faint);
}

/* -------------------------------------------------------------------- index */

.museum-index {
  position: absolute;
  inset: 0;
  z-index: 40;
  background: #0a0a09;
  overflow-y: auto;
  padding: clamp(32px, 5vw, 76px) clamp(22px, 6vw, 96px) 80px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s var(--ease), visibility 0.5s;
}
.museum-index.is-open {
  opacity: 1;
  visibility: visible;
}
.museum-index[hidden] {
  display: block;
}
.index-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--hair);
  padding-bottom: 26px;
}
.index-eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.24em;
  color: var(--bone-faint);
}
.index-head h2 {
  margin: 0 0 8px;
  font-family: var(--font-cn-serif);
  font-weight: 400;
  font-size: clamp(24px, 3vw, 38px);
  letter-spacing: 0.12em;
}
.index-sub {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  color: var(--bone-faint);
}
.index-close {
  width: 40px;
  height: 40px;
  border: 1px solid var(--hair);
  background: none;
  color: var(--bone-soft);
  font-size: 18px;
  cursor: pointer;
  flex: none;
}
.index-close:hover,
.index-close:focus-visible {
  border-color: var(--bone);
  color: var(--bone);
}
.index-hint {
  margin: 20px 0 26px;
  font-size: 12.5px;
  color: var(--bone-faint);
  max-width: 62ch;
}
.index-filters {
  display: flex;
  gap: 18px;
  margin-bottom: 10px;
}
.index-filters button {
  appearance: none;
  border: 0;
  background: none;
  padding: 4px 0;
  color: var(--bone-faint);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  cursor: pointer;
  border-bottom: 1px solid transparent;
}
.index-filters button.is-active,
.index-filters button:hover {
  color: var(--bone);
  border-bottom-color: var(--copper-lit);
}

.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.index-row {
  display: grid;
  grid-template-columns: 92px minmax(180px, 1.1fr) minmax(200px, 1.5fr) 150px 76px 168px;
  gap: 24px;
  align-items: center;
  padding: 26px 0;
  border-top: 1px solid var(--hair-soft);
  transition: background 0.4s var(--ease);
}
.index-row:hover {
  background: rgba(232, 228, 218, 0.035);
}
.index-row.is-visited .index-num {
  color: var(--copper-lit);
}
.index-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--bone-faint);
  align-self: start;
  padding-top: 4px;
}
.index-names {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.index-names strong {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 14px;
  letter-spacing: 0.08em;
}
.index-names em {
  font-style: normal;
  font-family: var(--font-cn-serif);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--bone-soft);
}
.index-desc {
  font-size: 12px;
  line-height: 1.8;
  color: var(--bone-faint);
}
.index-ban {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--copper-lit);
  line-height: 1.7;
}
.index-state {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bone-faint);
}
.index-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}
.index-actions a,
.index-enter {
  appearance: none;
  border: 0;
  background: none;
  padding: 0;
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border-bottom: 1px solid var(--hair);
  cursor: pointer;
}
.index-actions a:hover,
.index-enter:hover {
  border-bottom-color: var(--bone);
}
.index-sealed {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bone-faint);
}
.index-empty {
  padding: 40px 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--bone-faint);
  border-top: 1px solid var(--hair-soft);
}

/* ------------------------------------------------------------------ loading */

.museum-loading {
  position: absolute;
  inset: 0;
  z-index: 60;
  background: #0a0a09;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  transition: opacity 0.9s var(--ease), visibility 0.9s;
}
.museum-loading.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.loading-mark {
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.6em;
  color: var(--bone);
  padding-left: 0.6em;
}
.museum-loading p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 8.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--bone-faint);
}
.museum-loading::after {
  content: "";
  width: 120px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--bone-faint), transparent);
  animation: loading-sweep 2.2s var(--ease) infinite;
}
@keyframes loading-sweep {
  0% { transform: scaleX(0.1); opacity: 0.2; }
  50% { transform: scaleX(1); opacity: 0.8; }
  100% { transform: scaleX(0.1); opacity: 0.2; }
}

/* ----------------------------------------------------------------- fallback */

.fallback {
  display: none;
}
.museum.has-no-webgl .fallback {
  display: block;
  position: absolute;
  inset: 0;
  z-index: 50;
  background: #0a0a09;
  overflow-y: auto;
  padding: clamp(40px, 8vw, 120px) clamp(22px, 7vw, 120px);
}
.fallback-eyebrow {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  color: var(--bone-faint);
  margin: 0 0 24px;
}
.fallback h2 {
  margin: 0 0 16px;
  font-family: var(--font-cn-serif);
  font-weight: 400;
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: 0.08em;
}
.fallback > p {
  max-width: 60ch;
  font-size: 13px;
  line-height: 1.9;
  color: var(--bone-soft);
}
.fallback ul {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  max-width: 780px;
}
.fallback li {
  display: grid;
  grid-template-columns: 92px 1fr 1.2fr auto;
  gap: 20px;
  align-items: baseline;
  padding: 20px 0;
  border-top: 1px solid var(--hair-soft);
  font-size: 13px;
}
.fallback li span {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--bone-faint);
}
.fallback li strong {
  font-family: var(--font-cn-serif);
  font-weight: 400;
  letter-spacing: 0.14em;
}
.fallback li em {
  font-style: normal;
  font-family: var(--font-display);
  letter-spacing: 0.08em;
  color: var(--bone-soft);
}
.fallback li a {
  color: var(--bone);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  border-bottom: 1px solid var(--hair);
}

/* --------------------------------------------------------------- responsive */

@media (max-width: 1024px) {
  .museum-dossier {
    width: min(480px, 62vw);
  }
  .index-row {
    grid-template-columns: 80px minmax(150px, 1fr) minmax(160px, 1.2fr) 130px;
  }
  .index-state,
  .index-actions {
    grid-column: span 2;
  }
}

@media (max-width: 767px) {
  .museum-bar {
    grid-template-columns: auto 1fr;
    grid-template-areas:
      "brand controls"
      "locator locator";
    gap: 12px;
    padding: 14px 18px 24px;
  }
  .museum-brand {
    grid-area: brand;
  }
  .museum-controls {
    grid-area: controls;
    gap: 12px;
  }
  .museum-locator {
    grid-area: locator;
    align-items: flex-start;
    text-align: left;
    padding-top: 4px;
  }
  .ctl {
    font-size: 8.5px;
    letter-spacing: 0.1em;
  }

  .museum-hero {
    left: 20px;
    right: 20px;
    bottom: 108px;
    max-width: none;
  }
  .museum-hero h1 {
    font-size: clamp(38px, 11vw, 58px);
  }
  .hero-foot {
    flex-wrap: wrap;
    gap: 12px;
  }

  .museum-hint {
    display: none;
  }
  .museum-progress {
    left: 18px;
    bottom: 20px;
    gap: 10px;
  }
  .progress-tick {
    width: 14px;
  }
  .museum-return {
    right: 18px;
    bottom: 18px;
    gap: 14px;
  }
  .museum-return [data-open-index] {
    display: none;
  }
  .museum-return button {
    font-size: 8px;
    letter-spacing: 0.12em;
  }
  .hotspot--object::after {
    display: none;
  }
  .hotspot-label {
    display: none;
  }
  .progress-label {
    display: none;
  }

  .museum-dossier {
    top: auto;
    left: 0;
    width: 100%;
    height: 88vh;
    border-left: 0;
    border-top: 1px solid var(--hair);
    transform: translateY(100%);
  }
  .museum-dossier.is-open {
    transform: translateY(0);
  }
  .dossier-meta dl {
    grid-template-columns: 1fr;
  }

  .hotspot--portal {
    min-width: 132px;
    padding: 9px 12px 10px;
  }
  .hotspot--portal .hs-name {
    font-size: 12px;
  }
  .hotspot--object {
    width: 44px;
    height: 44px;
  }
  .hotspot-ring {
    inset: -6px;
  }
  .hotspot-label {
    left: 56px;
  }

  .museum-index {
    padding: 24px 18px 60px;
  }
  .index-row {
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 22px 0;
  }
  .index-desc {
    order: 3;
  }
  .index-state,
  .index-actions {
    grid-column: auto;
  }
  .index-actions {
    flex-direction: row;
    align-items: center;
    gap: 18px;
  }
  .fallback li {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .museum-hero,
  .museum-dossier,
  .museum-index,
  .museum-loading,
  .hotspot,
  .enter-button {
    transition-duration: 0.01ms;
  }
  .museum-loading::after {
    animation: none;
  }
}


/* ---------------------------------------------------------------- absence */

.absence {
  position: absolute;
  left: clamp(20px, 7vw, 120px);
  bottom: clamp(90px, 16vh, 160px);
  z-index: 16;
  max-width: min(760px, 82vw);
  pointer-events: none;
  opacity: 0;
  transition: opacity 1.6s var(--ease);
}
.absence.is-visible {
  opacity: 1;
}
.absence[hidden] {
  display: block;
}
.absence-lines p {
  margin: 0;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 1.8s var(--ease), transform 1.8s var(--ease);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3.1vw, 44px);
  line-height: 1.22;
  letter-spacing: 0.035em;
  color: var(--bone);
}
.absence-lines p + p {
  margin-top: 10px;
}
.absence-lines p.is-in {
  opacity: 1;
  transform: translateY(0);
}
.absence-lines .absence-brand {
  margin-top: 34px;
  font-family: var(--font-display);
  font-size: clamp(15px, 1.5vw, 19px);
  letter-spacing: 0.55em;
  color: var(--bone-soft);
}
.absence-lines .absence-tag {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.26em;
  color: var(--bone-faint);
}
.absence-actions {
  margin-top: 30px;
  display: flex;
  gap: 24px;
  pointer-events: auto;
}
.absence-actions button {
  appearance: none;
  border: 0;
  background: none;
  padding: 0 0 5px;
  color: var(--bone-soft);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  border-bottom: 1px solid var(--hair);
}
.absence-actions button:hover,
.absence-actions button:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

.index-absence {
  margin-top: 36px;
  padding-top: 26px;
  border-top: 1px solid var(--hair);
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}
.index-absence p {
  margin: 10px 0 0;
  font-size: 12.5px;
  color: var(--bone-faint);
}
.index-absence button {
  appearance: none;
  border: 1px solid var(--hair);
  background: none;
  color: var(--bone);
  padding: 14px 22px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  white-space: nowrap;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}
.index-absence button:hover,
.index-absence button:focus-visible {
  background: var(--bone);
  color: var(--ink);
}
@media (max-width: 767px) {
  .absence {
    left: 20px;
    right: 20px;
    bottom: 96px;
  }
  .index-absence {
    flex-direction: column;
    align-items: flex-start;
  }
}

.museum[data-zone="absence"] .museum-hint {
  opacity: 0;
}


/* ------------------------------------------------------------------- tour */

.only-atrium {
  display: none;
}
.museum[data-zone="atrium"] .only-atrium {
  display: inline-flex;
}

.tour {
  position: absolute;
  left: 50%;
  bottom: 68px;
  transform: translate(-50%, 8px);
  z-index: 18;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 10px 16px;
  border: 1px solid var(--hair);
  background: rgba(10, 10, 9, 0.78);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.tour.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
  pointer-events: auto;
}
.tour[hidden] {
  display: flex;
}
.tour-label {
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.22em;
  color: var(--copper-lit);
}
.tour-step {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--bone);
}
.tour-zone {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--bone-soft);
  min-width: 150px;
}
.tour button {
  appearance: none;
  border: 0;
  background: none;
  padding: 2px 0;
  color: var(--bone-soft);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  border-bottom: 1px solid var(--hair);
}
.tour button:hover,
.tour button:focus-visible,
.tour button.is-active {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

@media (max-width: 767px) {
  .tour {
    bottom: 56px;
    gap: 10px;
    padding: 8px 12px;
  }
  .tour-zone {
    display: none;
  }
}