/* ============================================================
   HeadTracking Hologram3D — UI
   ============================================================ */

:root {
  --bg:          #05070c;
  --panel:       rgba(14, 18, 28, 0.82);
  --panel-solid: #0e121c;
  --stroke:      rgba(255, 255, 255, 0.09);
  --stroke-hi:   rgba(255, 255, 255, 0.18);
  --text:        #e7ecf5;
  --muted:       #8792a8;
  --accent:      #4fd1ff;
  --accent-2:    #a67bff;
  --good:        #45e39a;
  --bad:         #ff6b6b;
  --warn:        #ffcc5c;
  --r:           12px;
  --font:        "Inter", "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono:        "JetBrains Mono", "Cascadia Mono", ui-monospace, "SF Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  /* `dvh` tracks the visual viewport as mobile browser chrome collapses; `%`
     alone leaves a strip of background showing at the bottom on iOS Safari. */
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  /* Stops iOS double-tap-to-zoom and the rubber-band scroll, both of which
     fight with a full-bleed canvas. */
  touch-action: manipulation;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

button, input { font-family: inherit; }

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

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  z-index: 1;             /* above the AR passthrough video */
}

/* Rear-camera feed for AR mode. Sits underneath the canvas, which clears to
   transparent while AR is on. `cover` because the sensor aspect rarely matches
   the viewport and letterboxing would break the illusion of a see-through. */
.ar-video {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
  pointer-events: none;
}

.hidden { display: none !important; }

/* ---------------- splash ---------------- */

.splash {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(1100px 700px at 50% -15%, rgba(79, 209, 255, 0.16), transparent 60%),
    radial-gradient(900px 600px at 85% 110%, rgba(166, 123, 255, 0.14), transparent 60%),
    #05070c;
  animation: fade-in .4s ease;
}

@keyframes fade-in { from { opacity: 0 } to { opacity: 1 } }

.splash.leaving { opacity: 0; pointer-events: none; transition: opacity .45s ease; }

.splash-card {
  width: min(620px, 100%);
  max-height: 100%;
  overflow: auto;
  padding: 34px 34px 28px;
  border: 1px solid var(--stroke-hi);
  border-radius: 20px;
  background: linear-gradient(180deg, rgba(20, 26, 40, 0.9), rgba(10, 13, 21, 0.94));
  box-shadow: 0 40px 100px -30px rgba(0, 0, 0, 0.9), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(18px);
}

.logo { display: flex; gap: 16px; align-items: center; margin-bottom: 20px; }

.logo-glyph {
  font-size: 40px;
  line-height: 1;
  background: linear-gradient(140deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 22px rgba(79, 209, 255, 0.45));
}

.splash h1 {
  margin: 0;
  font-size: 25px;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.splash h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tag { margin: 4px 0 0; color: var(--muted); font-size: 13.5px; }

.blurb {
  margin: 0 0 20px;
  color: #c3cbdb;
  font-size: 14px;
  line-height: 1.65;
}

.blurb strong { color: var(--text); font-weight: 600; }

.checklist { list-style: none; margin: 0 0 24px; padding: 0; display: grid; gap: 10px; }

.checklist li {
  display: flex;
  gap: 12px;
  align-items: center;
  font-size: 13.5px;
  color: #b8c1d3;
}

.checklist li em { font-style: normal; color: var(--accent); }

.checklist span {
  flex: none;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(79, 209, 255, 0.12);
  border: 1px solid rgba(79, 209, 255, 0.3);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
}

button.primary {
  width: 100%;
  padding: 14px;
  border: 0;
  border-radius: var(--r);
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  color: #05070c;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: transform .12s ease, filter .12s ease, opacity .2s;
}

button.primary:hover { filter: brightness(1.1); }
button.primary:active { transform: translateY(1px); }
button.primary:disabled { opacity: .55; cursor: progress; filter: none; }

.splash-status {
  margin-top: 14px;
  min-height: 18px;
  text-align: center;
  font-size: 12.5px;
  color: var(--muted);
  font-family: var(--mono);
}

.splash-status.err { color: var(--bad); }
.splash-status.ok  { color: var(--good); }

.fineprint {
  margin-top: 14px;
  text-align: center;
  font-size: 11.5px;
  color: #5d687e;
}

/* ---------------- HUD ---------------- */

.hud {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 20;
  padding: 12px 14px;
  min-width: 148px;
  border: 1px solid var(--stroke);
  border-radius: var(--r);
  background: var(--panel);
  backdrop-filter: blur(14px);
  font-family: var(--mono);
  font-size: 11px;
  user-select: none;
  pointer-events: none;
}

.hud hr { border: 0; border-top: 1px solid var(--stroke); margin: 8px 0; }

.hud-row { display: flex; justify-content: space-between; gap: 14px; line-height: 1.7; }
.hud-row b { color: var(--accent); font-weight: 600; font-variant-numeric: tabular-nums; }
.hud-row span { color: var(--muted); }
.hud-row b.good { color: var(--good); }
.hud-row b.bad  { color: var(--bad); }
.hud-row b.warn { color: var(--warn); }

/* ---------------- camera preview ---------------- */

.preview {
  position: fixed;
  left: 16px;
  bottom: 16px;
  z-index: 20;
  width: 260px;
  border: 1px solid var(--stroke);
  border-radius: var(--r);
  overflow: hidden;
  background: #000;
  box-shadow: 0 18px 44px -18px rgba(0, 0, 0, .85);
}

.preview.collapsed video, .preview.collapsed canvas { display: none; }
.preview.collapsed { width: 132px; }

.preview video, .preview canvas {
  display: block;
  width: 100%;
  transform: scaleX(-1);   /* mirror for natural feedback */
}

.preview canvas { position: absolute; inset: 0; height: auto; }

.preview-bar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 5px 6px 5px 10px;
  background: rgba(10, 13, 21, .9);
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.preview-bar button {
  width: 20px; height: 20px;
  display: grid; place-items: center;
  border: 1px solid var(--stroke);
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  line-height: 1;
}

.preview-bar button:hover { color: var(--text); border-color: var(--stroke-hi); }

/* ---------------- control panel ---------------- */

.panel {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  z-index: 30;
  width: 328px;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--stroke);
  background: var(--panel);
  backdrop-filter: blur(20px);
  transition: transform .28s cubic-bezier(.4, 0, .2, 1);
}

.panel.collapsed { transform: translateX(100%); }

.panel-head {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--stroke);
}

.panel-head h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: .02em;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.panel-head button, .panel-reopen {
  width: 26px; height: 26px;
  display: grid; place-items: center;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
}

.panel-head button:hover, .panel-reopen:hover { color: var(--text); border-color: var(--stroke-hi); }

.panel-reopen {
  position: fixed;
  top: 16px; right: 16px;
  z-index: 31;
  width: 32px; height: 32px;
  background: var(--panel);
  backdrop-filter: blur(14px);
}

.panel-body { flex: 1; overflow-y: auto; padding: 4px 16px 40px; scrollbar-width: thin; }
.panel-body::-webkit-scrollbar { width: 8px; }
.panel-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 4px; }

.group { padding: 16px 0; border-bottom: 1px solid var(--stroke); }
.group:last-child { border-bottom: 0; }

.group h3 {
  margin: 0 0 12px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

.group h3 small { text-transform: none; letter-spacing: 0; opacity: .7; font-weight: 400; }

/* segmented control */

.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--stroke);
  border-radius: 10px;
  background: rgba(0, 0, 0, .28);
}

.segmented button {
  padding: 7px 4px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: background .15s, color .15s;
}

.segmented button:hover { color: var(--text); }

.segmented button.active {
  background: linear-gradient(100deg, rgba(79, 209, 255, .22), rgba(166, 123, 255, .22));
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(79, 209, 255, .3);
}

/* sliders */

.slider { display: block; margin: 13px 0; }

.slider > span {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 7px;
  font-size: 12px;
  color: #b6bfd1;
}

.slider > span small { color: var(--muted); font-size: 10.5px; }

.slider i {
  font-style: normal;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 3px;
  background: rgba(255, 255, 255, .1);
  outline: none;
  cursor: pointer;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--panel-solid);
  box-shadow: 0 0 0 1px var(--accent), 0 0 12px rgba(79, 209, 255, .5);
  cursor: grab;
}

input[type=range]::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--panel-solid);
  box-shadow: 0 0 0 1px var(--accent);
  cursor: grab;
}

/* select + colour */

.select {
  width: 100%;
  padding: 9px 30px 9px 11px;
  border: 1px solid var(--stroke);
  border-radius: 9px;
  background-color: rgba(0, 0, 0, .28);
  /* Chevron drawn inline so the control needs no image asset and matches the
     panel palette in both the closed and focused states. */
  background-image:
    url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5l5-5' fill='none' stroke='%238792a8' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 11px center;
  background-size: 11px;
  color: var(--text);
  font-size: 12.5px;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

.select:hover { border-color: var(--stroke-hi); }
.select:focus-visible { outline: none; border-color: var(--accent); }
/* The dropdown list itself is OS-rendered; only the colours are ours to set. */
.select option { background: var(--panel-solid); color: var(--text); }

.colour {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin: 13px 0;
  font-size: 12px;
  color: #b6bfd1;
}

.colour input[type=color] {
  width: 54px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--stroke-hi);
  border-radius: 7px;
  background: transparent;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
}

.colour input[type=color]::-webkit-color-swatch-wrapper { padding: 3px; }
.colour input[type=color]::-webkit-color-swatch { border: 0; border-radius: 4px; }
.colour input[type=color]::-moz-color-swatch { border: 0; border-radius: 4px; }

/* checkboxes */

.check {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 9px 0;
  font-size: 12.5px;
  color: #b6bfd1;
  cursor: pointer;
  user-select: none;
}

.check input { accent-color: var(--accent); width: 14px; height: 14px; cursor: pointer; }
.check:hover { color: var(--text); }

/* buttons */

.btn-row { display: flex; gap: 8px; margin: 10px 0; }

.btn-row button {
  flex: 1;
  padding: 8px 10px;
  border: 1px solid var(--stroke);
  border-radius: 9px;
  background: rgba(255, 255, 255, .04);
  color: #c8d1e2;
  font-size: 12px;
  cursor: pointer;
  transition: background .15s, border-color .15s, color .15s;
}

.btn-row button:hover {
  background: rgba(79, 209, 255, .12);
  border-color: rgba(79, 209, 255, .35);
  color: var(--text);
}

.hint { margin: 8px 0 0; font-size: 11.5px; line-height: 1.55; color: var(--muted); }
.hint em { font-style: normal; color: #b6bfd1; }
.hint b  { color: var(--accent); font-weight: 600; }
.hint.keys { line-height: 1.9; }

.model-name {
  margin: 4px 0 6px;
  padding: 7px 10px;
  border: 1px solid var(--stroke);
  border-radius: 8px;
  background: rgba(0, 0, 0, .25);
  font-family: var(--mono);
  font-size: 11px;
  color: #9fb0c8;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.readout {
  margin: -4px 0 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  line-height: 1.5;
  color: var(--muted);
  white-space: pre-line;   /* the readout is two lines: size, then camera position */
}

.progress {
  height: 3px;
  border-radius: 2px;
  background: rgba(255, 255, 255, .08);
  overflow: hidden;
  margin-bottom: 8px;
}

.progress > div {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .18s ease;
}

/* ---------------- AR quick toggle ---------------- */

/* Bottom-right: the reachable corner for a thumb, and the only one not already
   taken (HUD top-left, preview bottom-left, panel button top-right).
   z-index sits above the HUD but below the panel, so the full-screen mobile
   panel covers it when open. */
.ar-fab {
  position: fixed;
  right: calc(16px + env(safe-area-inset-right));
  bottom: calc(16px + env(safe-area-inset-bottom));
  z-index: 25;

  display: flex;
  align-items: center;
  gap: 9px;
  padding: 13px 20px 13px 17px;
  min-height: 52px;

  border: 1px solid var(--stroke-hi);
  border-radius: 999px;
  background: rgba(14, 18, 28, 0.86);
  backdrop-filter: blur(14px);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  box-shadow: 0 12px 32px -10px rgba(0, 0, 0, .8);
  transition: background .2s, border-color .2s, color .2s, transform .12s, box-shadow .2s;
}

.ar-fab:active { transform: scale(.96); }

.ar-fab-icon {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
}

.ar-fab-icon svg { width: 100%; height: 100%; }

/* Active: unmistakably "on", since the whole scene changing is the only other
   signal and a user who just enabled it needs to know the tap registered. */
.ar-fab.active {
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #05070c;
  box-shadow: 0 12px 34px -8px rgba(79, 209, 255, .55);
}

/* Busy: opening a camera takes a moment and can fail, so the control is locked
   rather than letting a second tap race the first. */
.ar-fab.busy {
  pointer-events: none;
  opacity: .65;
}

.ar-fab.busy .ar-fab-icon { animation: ar-pulse 1s ease-in-out infinite; }

@keyframes ar-pulse {
  0%, 100% { opacity: .35; transform: scale(.9); }
  50%      { opacity: 1;   transform: scale(1.05); }
}

@media (hover: hover) {
  .ar-fab:hover { border-color: var(--accent); }
  .ar-fab.active:hover { filter: brightness(1.08); }
}

/* ---------------- toast ---------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 60;
  transform: translate(-50%, 16px);
  padding: 10px 18px;
  border: 1px solid var(--stroke-hi);
  border-radius: 999px;
  background: rgba(14, 18, 28, .94);
  backdrop-filter: blur(14px);
  font-size: 12.5px;
  color: var(--text);
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s, transform .22s;
  white-space: nowrap;
}

.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ---------------- dropzone ---------------- */

.dropzone {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: none;
  place-items: center;
  background: rgba(5, 7, 12, .8);
  backdrop-filter: blur(6px);
}

.dropzone.show { display: grid; }

.dropzone > div {
  padding: 40px 60px;
  border: 2px dashed rgba(79, 209, 255, .55);
  border-radius: 20px;
  font-size: 16px;
  color: var(--text);
}

.dropzone b { color: var(--accent); }

/* ---------------- narrow screens ---------------- */

/* ---------------- touch & small screens ---------------- */

/* Touch targets: a 14 px slider thumb is unusable with a fingertip. */
@media (pointer: coarse) {
  input[type=range] { height: 22px; background: transparent; }
  input[type=range]::-webkit-slider-runnable-track {
    height: 5px; border-radius: 3px; background: rgba(255, 255, 255, .12);
  }
  input[type=range]::-moz-range-track {
    height: 5px; border-radius: 3px; background: rgba(255, 255, 255, .12);
  }
  input[type=range]::-webkit-slider-thumb { width: 22px; height: 22px; margin-top: -8.5px; }
  input[type=range]::-moz-range-thumb { width: 20px; height: 20px; }

  .check { margin: 14px 0; font-size: 13.5px; }
  .select { padding: 13px 30px 13px 12px; font-size: 14px; }
  .colour input[type=color] { width: 64px; height: 38px; }
  .check input { width: 20px; height: 20px; }
  .btn-row button { padding: 12px 10px; font-size: 13px; }
  .segmented button { padding: 11px 4px; font-size: 13px; }
  .panel-head button, .panel-reopen { width: 40px; height: 40px; font-size: 16px; }
  .preview-bar button { width: 30px; height: 30px; }
}

@media (max-width: 760px) {
  /* The panel becomes a full-height sheet. `dvh` again, and safe-area padding
     so the close button clears a notch and the last control clears the home bar. */
  .panel {
    width: 100%;
    height: 100dvh;
    padding-top: env(safe-area-inset-top);
  }

  .panel-body { padding-bottom: calc(56px + env(safe-area-inset-bottom)); }

  .panel-reopen {
    top: calc(12px + env(safe-area-inset-top));
    right: calc(12px + env(safe-area-inset-right));
  }

  /* HUD and preview share the left edge; on a phone they would overlap, so the
     HUD sheds its lower half and the preview shrinks and caps its height. */
  .hud {
    top: calc(10px + env(safe-area-inset-top));
    left: calc(10px + env(safe-area-inset-left));
    padding: 8px 10px;
    min-width: 0;
    font-size: 9.5px;
  }

  .hud hr:last-of-type ~ .hud-row { display: none; }

  .preview {
    width: 128px;
    left: calc(10px + env(safe-area-inset-left));
    bottom: calc(10px + env(safe-area-inset-bottom));
  }

  .preview video, .preview canvas { max-height: 172px; object-fit: cover; }
  .preview.collapsed { width: 104px; }
  .preview-bar { font-size: 9px; padding: 4px 4px 4px 7px; }

  /* Lifted above the AR button, which shares the bottom edge. */
  .toast {
    bottom: calc(84px + env(safe-area-inset-bottom));
    max-width: 88vw;
    white-space: normal;
    text-align: center;
  }

  .splash { padding: 0; }
  .splash-card {
    border-radius: 0;
    border: 0;
    height: 100dvh;
    padding: calc(24px + env(safe-area-inset-top)) 22px calc(24px + env(safe-area-inset-bottom));
  }
  .splash h1 { font-size: 22px; }
  .blurb { font-size: 13px; }
  button.primary { padding: 16px; }

  /* Drag-and-drop does not exist on touch; the file picker button covers it. */
  .dropzone { display: none !important; }
}

/* Landscape phone: vertical space is the scarce resource. */
@media (max-height: 480px) and (orientation: landscape) {
  .splash-card { padding-top: 16px; padding-bottom: 16px; }
  .checklist { display: none; }
  .blurb { display: none; }
  .preview { width: 108px; }
  .preview video, .preview canvas { max-height: 96px; }
}