/* Single dark UI by design: controls float over full-bleed photography,
   so they keep one glass treatment regardless of the OS theme. */
:root {
  --ink: #0c1a2b;
  --glass: rgba(12, 26, 43, 0.82);
  --glass-strong: rgba(9, 20, 34, 0.94);
  --line: rgba(214, 228, 240, 0.14);
  --text: #edf2f6;
  --muted: #9db0c3;
  --teal: #56d3c0;
  --amber: #f4b740;
  --wa: #3ddc84;
  --sign: #f5f7f8;

  --display: 'Bricolage Grotesque', 'Avenir Next', 'Segoe UI', system-ui, sans-serif;
  --body: 'IBM Plex Sans', 'Helvetica Neue', Arial, system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --gutter: 16px;
  --radius: 14px;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--ink);
  color: var(--text);
  font: 400 14px/1.5 var(--body);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
button, a { font: inherit; color: inherit; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: none; }
:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }

#viewer { position: fixed; inset: 0; }
#viewer.psv-container { background: var(--ink); }
.psv-loader-container { color: var(--teal); }

/* ---------- Wayfinding sign ---------- */
.sign {
  position: fixed;
  top: calc(var(--gutter) + env(safe-area-inset-top, 0px));
  left: var(--gutter);
  max-width: min(420px, calc(100vw - 2 * var(--gutter)));
  padding: 12px 16px 12px 12px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  z-index: 20;
  pointer-events: none;
}
.sign__campus {
  font: 600 10.5px/1.3 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px 4px;
}
.sign__row { display: flex; align-items: center; gap: 14px; }
.level {
  display: grid; place-items: center;
  width: 52px; height: 52px; flex: none;
  background: var(--sign); color: var(--ink);
  font: 600 26px/1 var(--mono);
  border-radius: 8px;
  box-shadow: inset 0 -4px 0 var(--teal);
}
.sign__building { font-size: 12.5px; color: var(--muted); }
.sign__room {
  margin: 0;
  font: 700 22px/1.12 var(--display);
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.sign__demo {
  margin: 10px 0 0 4px;
  font: 500 10.5px/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--amber);
}

/* ---------- Hotspots ---------- */
.hs {
  position: relative;
  width: 56px; height: 56px;
  display: grid; place-items: center;
  cursor: pointer;
}
.hs__ring {
  position: absolute; inset: 6px;
  border-radius: 50%;
  border: 2px solid var(--teal);
  background: rgba(12, 26, 43, 0.55);
  transition: transform 0.2s ease, background 0.2s ease;
}
.hs::after {
  content: '';
  position: absolute; inset: 0;
  border-radius: 50%;
  border: 2px solid var(--teal);
  opacity: 0;
  animation: ping 2.4s ease-out infinite;
}
.hs svg { position: relative; width: 22px; height: 22px; color: var(--teal); stroke-width: 2.4; }
.hs:hover .hs__ring { transform: scale(1.12); background: rgba(86, 211, 192, 0.25); }
.hs__label {
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%);
  margin-top: 6px;
  white-space: nowrap;
  padding: 4px 10px;
  background: var(--glass-strong);
  border-radius: 999px;
  font: 500 12.5px/1.4 var(--body);
  color: var(--text);
  pointer-events: none;
}
.hs--info .hs__ring { border-color: var(--amber); }
.hs--info::after { border-color: var(--amber); }
.hs--info svg { color: var(--amber); }
.hs--info:hover .hs__ring { background: rgba(244, 183, 64, 0.25); }
.hs--info .hs__label { opacity: 0; transition: opacity 0.2s; }
.hs--info:hover .hs__label { opacity: 1; }

@keyframes ping {
  0% { transform: scale(0.7); opacity: 0.7; }
  80%, 100% { transform: scale(1.35); opacity: 0; }
}

/* ---------- Panels (shared) ---------- */
.directory, .pip {
  position: fixed;
  z-index: 30;
  background: var(--glass-strong);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: auto;
  overscroll-behavior: contain;
}
.panel-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.panel-head h2 { margin: 0; font: 700 19px/1.2 var(--display); text-wrap: balance; }
.icon-btn {
  display: grid; place-items: center;
  width: 36px; height: 36px; flex: none;
  border: 1px solid var(--line); border-radius: 50%;
  background: transparent; cursor: pointer;
}
.icon-btn:hover { background: rgba(255, 255, 255, 0.08); }

/* ---------- Directory ---------- */
.directory {
  top: calc(var(--gutter) + env(safe-area-inset-top, 0px));
  left: var(--gutter);
  bottom: calc(96px + env(safe-area-inset-bottom, 0px));
  width: min(380px, calc(100vw - 2 * var(--gutter)));
  padding: 18px;
  display: flex; flex-direction: column; gap: 14px;
}
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab {
  padding: 6px 12px;
  border: 1px solid var(--line); border-radius: 999px;
  background: transparent; cursor: pointer;
  font-size: 13px; color: var(--muted);
}
.tab[aria-selected="true"] { background: var(--text); color: var(--ink); border-color: var(--text); font-weight: 600; }
.floors { display: flex; flex-direction: column; gap: 14px; }
.floor { display: grid; grid-template-columns: 40px 1fr; gap: 12px; }
.floor .level { width: 40px; height: 40px; font-size: 18px; box-shadow: inset 0 -3px 0 var(--teal); }
.floor__name { font: 600 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin: 3px 0 8px; }
.rooms { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.room {
  display: flex; align-items: center; gap: 10px;
  width: 100%; text-align: left;
  padding: 6px 8px; margin-left: -8px;
  border: 0; border-radius: 8px; background: transparent;
  color: var(--muted); font-size: 13.5px;
}
.room .dot { flex: none; }
button.room { color: var(--text); cursor: pointer; font-weight: 500; }
button.room:hover { background: rgba(86, 211, 192, 0.12); }
button.room[aria-current="true"] { background: rgba(86, 211, 192, 0.18); }
.room__go { margin-left: auto; font: 600 10.5px/1 var(--mono); letter-spacing: 0.06em; color: var(--teal); }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; border: 1.5px solid var(--muted); vertical-align: middle; }
.dot--live { background: var(--teal); border-color: var(--teal); }
.directory__legend { margin: auto 0 0; padding-top: 12px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* ---------- PIP ---------- */
.pip {
  top: calc(var(--gutter) + env(safe-area-inset-top, 0px));
  right: var(--gutter);
  bottom: calc(96px + env(safe-area-inset-bottom, 0px));
  width: min(400px, calc(100vw - 2 * var(--gutter)));
  padding: 0;
  animation: pip-in 0.28s ease-out;
}
@keyframes pip-in { from { transform: translateY(12px); opacity: 0.4; } }
.pip__media:empty { display: none; }
.pip__media video, .pip__media img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #000; }
.pip__body { padding: 16px 18px 18px; display: flex; flex-direction: column; gap: 12px; }
.pip__dept { font: 600 10.5px/1.3 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--amber); margin-bottom: 4px; }
.pip__title { font-size: 22px !important; }
.pip__text { margin: 0; color: #d3dde6; max-width: 62ch; }
.pip__facts { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; padding: 12px 0; border-block: 1px solid var(--line); }
.pip__facts:empty { display: none; }
.pip__facts dt { color: var(--muted); font-size: 12.5px; }
.pip__facts dd { margin: 0; font-size: 13px; font-weight: 500; }
.pip__gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 8px; }
.pip__gallery:empty { display: none; }
.pip__gallery button { padding: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; cursor: zoom-in; background: none; }
.pip__gallery img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.pip__actions { display: flex; flex-wrap: wrap; gap: 8px; }
.pip__actions:empty { display: none; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line); border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  text-decoration: none; font-size: 13px; font-weight: 500; cursor: pointer;
}
.pill:hover { background: rgba(255, 255, 255, 0.1); }
.pill svg { width: 17px; height: 17px; }
.pill--audio[aria-pressed="true"] { border-color: var(--amber); color: var(--amber); }
.pill--wa svg { color: var(--wa); }
.pip__sample { font: 500 10.5px/1.4 var(--mono); color: var(--muted); letter-spacing: 0.03em; }

/* ---------- Dock ---------- */
.dock {
  position: fixed;
  left: 50%; transform: translateX(-50%);
  bottom: calc(var(--gutter) + env(safe-area-inset-bottom, 0px));
  z-index: 25;
  display: flex; align-items: center; gap: 6px;
  max-width: calc(100vw - 2 * var(--gutter));
  padding: 6px;
  background: var(--glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow-x: auto;
  scrollbar-width: none;
}
.dock::-webkit-scrollbar { display: none; }
.dock__group { display: flex; gap: 2px; align-items: center; }
.dock__sep { width: 1px; align-self: stretch; margin: 6px 4px; background: var(--line); flex: none; }
.dock__btn {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  min-width: 64px; padding: 7px 8px 6px;
  border: 0; border-radius: 12px; background: transparent;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  font-size: 11px; color: var(--muted);
}
.dock__btn svg { color: var(--text); }
.dock__btn:hover:not(:disabled) { background: rgba(255, 255, 255, 0.08); color: var(--text); }
.dock__btn:disabled { opacity: 0.35; cursor: default; }
.dock__btn[aria-pressed="true"], .dock__btn[aria-expanded="true"] { background: rgba(86, 211, 192, 0.16); color: var(--teal); }
.dock__btn[aria-pressed="true"] svg, .dock__btn[aria-expanded="true"] svg { color: var(--teal); }
.dock__btn--vr { color: var(--ink); background: var(--teal); font-weight: 600; }
.dock__btn--vr svg { color: var(--ink); }
.dock__btn--vr:hover:not(:disabled) { background: #7ae0d1; color: var(--ink); }
.dock__btn--wa svg { color: var(--wa); }

/* ---------- Toast & lightbox ---------- */
.toast {
  position: fixed; left: 50%; transform: translateX(-50%);
  bottom: calc(96px + env(safe-area-inset-bottom, 0px));
  z-index: 40;
  padding: 10px 16px;
  background: var(--glass-strong); border: 1px solid var(--line); border-radius: 999px;
  font-size: 13px;
}
.lightbox {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center;
  padding: var(--gutter);
  background: rgba(5, 10, 18, 0.9);
  cursor: zoom-out;
}
.lightbox img { max-width: 100%; max-height: 100%; border-radius: 10px; }

/* ---------- Phone ---------- */
@media (max-width: 720px) {
  .sign { padding: 10px 12px 10px 10px; right: var(--gutter); }
  .sign__campus { display: none; }
  .level { width: 42px; height: 42px; font-size: 21px; }
  .sign__room { font-size: 18px; }
  .sign__demo { margin-top: 8px; }
  .dock { left: var(--gutter); right: var(--gutter); transform: none; justify-content: flex-start; }
  .dock__btn { min-width: 58px; }
    .directory, .pip {
    top: auto; left: var(--gutter); right: var(--gutter);
    bottom: calc(90px + env(safe-area-inset-bottom, 0px));
    width: auto; max-height: 62vh;
  }
  .hs--info .hs__label { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .hs::after { animation: none; }
  .pip { animation: none; }
}