:root {
  --ink: #0c0d10;
  --fog: #c8c4b8;
  --signal: #e8ff6a;
  --mute: #5a5e68;
  --on-glow: rgba(232, 255, 106, 0.18);
}

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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--ink);
  color: var(--fog);
  font-family: "IBM Plex Mono", "Cascadia Mono", "Consolas", monospace;
}

#stage {
  position: relative;
  width: 100vw;
  height: 100vh;
  background: var(--ink);
}

#bg-layer {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: #000;
}

#stage.no-assets #bg-layer {
  display: none;
}

.bg,
.card {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  user-select: none;
}

#bg-off {
  opacity: 1;
  z-index: 1;
  transition: opacity 180ms ease-out;
}

#bg-on {
  opacity: 0;
  z-index: 2;
  transition: opacity 180ms ease-out;
}

#stage.on #bg-on {
  opacity: 1;
}

#stage.on #bg-off {
  opacity: 0;
}

#stage.on {
  box-shadow: inset 0 0 120px var(--on-glow);
}

.card {
  z-index: 3;
  opacity: 1;
  transition: opacity 220ms ease-out;
}

.card.swap {
  opacity: 0;
}

#noise {
  position: absolute;
  inset: 0;
  z-index: 4;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.12;
  mix-blend-mode: screen;
}

#overlay {
  position: absolute;
  inset: 0;
  z-index: 4;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#track {
  position: fixed;
  left: 0;
  top: 0;
  /* Must keep a real layout size — 1×1px can starve canvas/WebGL frame reads. */
  width: 320px;
  height: 180px;
  opacity: 0;
  pointer-events: none;
  z-index: -1;
}

#cam-wrap {
  position: absolute;
  top: max(2.5vw, env(safe-area-inset-top));
  right: max(2.5vw, env(safe-area-inset-right));
  z-index: 6;
  width: 20vw;
  min-width: 96px;
  aspect-ratio: 1 / 1;
  background: #000;
  border: 1px solid var(--mute);
  display: none;
  pointer-events: none;
  overflow: hidden;
  transform: scaleX(-1);
  transition: opacity 200ms ease;
}

#stage.video-on #cam-wrap {
  display: block;
}

#stage.on.video-on #cam-wrap {
  border-color: var(--signal);
  box-shadow: 0 0 18px var(--on-glow);
}

#fullcam-wrap {
  position: absolute;
  right: max(2.5vw, env(safe-area-inset-right));
  bottom: calc(max(3.5vh, env(safe-area-inset-bottom)) + 1.7rem);
  z-index: 6;
  width: min(28vw, 380px);
  min-width: 168px;
  aspect-ratio: 16 / 9;
  background: #000;
  border: 1px solid var(--mute);
  display: none;
  pointer-events: none;
  overflow: hidden;
  transform: scaleX(-1);
  transition: opacity 200ms ease;
}

#stage.fullcam-on #fullcam-wrap {
  display: block;
}

#stage.on.fullcam-on #fullcam-wrap {
  border-color: var(--signal);
  box-shadow: 0 0 18px var(--on-glow);
}

#fullcam-feed,
#fullcam-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#cam {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  user-select: none;
  opacity: 0;
}

#cam-feed {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#cam-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#hud {
  position: absolute;
  left: max(2.5vw, env(safe-area-inset-left));
  bottom: max(3.5vh, env(safe-area-inset-bottom));
  z-index: 8;
  min-width: 248px;
  max-width: min(320px, calc(100vw - 2rem));
  max-height: calc(100vh - 2 * max(3.5vh, env(safe-area-inset-bottom)) - 1rem);
  overflow-y: auto;
  padding: 1rem 1.1rem 0.9rem;
  background: linear-gradient(160deg, rgba(12, 13, 16, 0.72), rgba(12, 13, 16, 0.35));
  border-left: 2px solid var(--mute);
  backdrop-filter: blur(6px);
  transition: opacity 200ms ease;
}

#hud.hidden {
  opacity: 0;
  pointer-events: none;
}

#stage.hud-off #cam-wrap,
#stage.hud-off #fullcam-wrap,
#stage.hud-off #hint,
#stage.hud-off #build {
  opacity: 0;
}

.row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mute);
  box-shadow: 0 0 0 0 transparent;
  transition: background 120ms, box-shadow 120ms;
}

#stage.on .dot {
  background: var(--signal);
  box-shadow: 0 0 12px var(--signal);
}

#stage.live .dot {
  animation: pulse 1.4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.25);
    opacity: 0.65;
  }
}

.overlay-ctrl {
  display: grid;
  grid-template-columns: 46px 1fr 52px;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
  color: var(--mute);
}

.overlay-ctrl label {
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.overlay-ctrl input[type="range"] {
  width: 100%;
  height: 12px;
  margin: 0;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  outline: none;
  cursor: pointer;
}

.overlay-ctrl input[type="range"]::-webkit-slider-runnable-track {
  height: 12px;
  background: linear-gradient(
    to bottom,
    transparent calc(50% - 2px),
    rgba(90, 94, 104, 0.45) calc(50% - 2px),
    rgba(90, 94, 104, 0.45) calc(50% + 2px),
    transparent calc(50% + 2px)
  );
}

.overlay-ctrl input[type="range"]::-moz-range-track {
  height: 4px;
  background: rgba(90, 94, 104, 0.45);
  border: 0;
}

.overlay-ctrl input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  margin-top: 0;
  border-radius: 50%;
  background: var(--fog);
  border: 0;
  cursor: pointer;
}

.overlay-ctrl input[type="range"]::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--fog);
  border: 0;
  cursor: pointer;
}

#stage.on .overlay-ctrl input[type="range"]::-webkit-slider-thumb {
  background: var(--signal);
}

#stage.on .overlay-ctrl input[type="range"]::-moz-range-thumb {
  background: var(--signal);
}

#overlay-val {
  font-variant-numeric: tabular-nums;
  text-align: right;
}

#tuning {
  margin-top: 0.75rem;
  max-height: min(42vh, 360px);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#tuning summary,
#info summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--mute);
  user-select: none;
  padding: 0.15rem 0;
}

#tuning summary::-webkit-details-marker,
#info summary::-webkit-details-marker {
  display: none;
}

#tuning summary::before,
#info summary::before {
  content: "▸ ";
  color: var(--fog);
}

#tuning[open] summary::before,
#info[open] summary::before {
  content: "▾ ";
}

#tuning-sliders {
  margin-top: 0.55rem;
  overflow-y: auto;
  max-height: min(34vh, 300px);
  padding-right: 0.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

#tuning-sliders .overlay-ctrl {
  grid-template-columns: 72px 1fr 44px;
  gap: 0.35rem;
}

#tuning-sliders .overlay-ctrl label {
  font-size: 0.62rem;
  letter-spacing: 0.03em;
  line-height: 1.15;
  cursor: help;
  border-bottom: 1px dotted rgba(90, 94, 104, 0.55);
}

#tuning-sliders .overlay-ctrl span {
  font-variant-numeric: tabular-nums;
  text-align: right;
  font-size: 0.68rem;
  color: var(--fog);
}

#tuning-reset {
  display: block;
  width: 100%;
  margin-top: 0.55rem;
  padding: 0.4rem 0.55rem;
  font: inherit;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mute);
  background: transparent;
  border: 1px solid rgba(90, 94, 104, 0.45);
  cursor: pointer;
}

#tuning-reset:hover {
  color: var(--fog);
  border-color: var(--fog);
}

#info {
  margin-top: 0.65rem;
}

#info-panel {
  margin: 0.45rem 0 0;
  max-height: min(36vh, 320px);
  overflow-y: auto;
  padding-right: 0.15rem;
  display: grid;
  grid-template-columns: minmax(72px, auto) 1fr;
  gap: 0.22rem 0.55rem;
  font-size: 0.66rem;
  letter-spacing: 0.03em;
}

#info-panel dt {
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

#info-panel dd {
  margin: 0;
  color: var(--fog);
  font-variant-numeric: tabular-nums;
  word-break: break-word;
}

#info-panel .info-section {
  grid-column: 1 / -1;
  margin-top: 0.35rem;
  padding-top: 0.3rem;
  border-top: 1px solid rgba(90, 94, 104, 0.35);
  color: var(--mute);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.6rem;
}

#info-panel .info-section:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

#tuning-tip {
  position: fixed;
  z-index: 40;
  max-width: min(280px, calc(100vw - 2rem));
  padding: 0.65rem 0.75rem;
  font-size: 0.72rem;
  line-height: 1.45;
  letter-spacing: 0.02em;
  color: var(--fog);
  background: rgba(12, 13, 16, 0.94);
  border: 1px solid rgba(90, 94, 104, 0.55);
  border-left: 2px solid var(--signal);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
  pointer-events: none;
}

#tuning-tip[hidden] {
  display: none;
}

#conf-line {
  margin-top: 0.7rem;
  font-size: 0.7rem;
  color: var(--mute);
  letter-spacing: 0.04em;
}

#gaze-line,
#calib-line {
  margin-top: 0.35rem;
  font-size: 0.7rem;
  color: var(--fog);
  letter-spacing: 0.04em;
}

#calib-line {
  color: var(--mute);
}

#calib-btn,
#install-btn {
  display: block;
  width: 100%;
  margin-top: 0.7rem;
  padding: 0.4rem 0.5rem;
  color: var(--fog);
  background: transparent;
  border: 1px solid var(--mute);
  font: inherit;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}

#calib-btn:hover,
#stage.calibrating #calib-btn,
#install-btn:hover {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
}

#install-btn[hidden] {
  display: none;
}

#calib {
  position: absolute;
  inset: 0;
  z-index: 7;
  pointer-events: none;
}

#calib[hidden] {
  display: none;
}

#calib-veil {
  position: absolute;
  inset: 0;
  background: rgba(12, 13, 16, 0.88);
}

#stage.calibrating #bg-layer,
#stage.calibrating #noise,
#stage.calibrating #overlay,
#stage.calibrating #quote,
#stage.calibrating #cam-wrap,
#stage.calibrating #fullcam-wrap {
  opacity: 0 !important;
  pointer-events: none;
}

#calib-copy {
  position: absolute;
  left: 50%;
  top: 18%;
  transform: translateX(-50%);
  text-align: center;
  pointer-events: none;
}

#calib-title {
  font-size: clamp(1.1rem, 2.4vw, 1.6rem);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
}

#calib-sub {
  margin-top: 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fog);
}

#calib-target {
  position: absolute;
  width: 110px;
  height: 110px;
  transform: translate(-50%, -50%);
  left: 50%;
  top: 50%;
  transition: left 220ms ease, top 220ms ease;
}

#calib-target.wait .calib-core {
  background: var(--fog);
  box-shadow: 0 0 14px rgba(200, 196, 184, 0.45);
  animation: calib-pulse 1s ease-in-out infinite;
}

#calib-target.near .calib-core {
  background: var(--signal);
  box-shadow: 0 0 22px var(--signal);
  animation: none;
}

@keyframes calib-pulse {
  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
  50% {
    transform: translate(-50%, -50%) scale(1.25);
    opacity: 0.65;
  }
}

#calib-target svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

#calib-target .ring-bg,
#calib-target .ring-fg {
  fill: none;
  stroke-width: 4;
}

#calib-target .ring-bg {
  stroke: rgba(90, 94, 104, 0.45);
}

#calib-target .ring-fg {
  stroke: var(--signal);
  stroke-dasharray: 264;
  stroke-dashoffset: 264;
  stroke-linecap: round;
}

.calib-core {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background: var(--signal);
  box-shadow: 0 0 18px var(--signal);
}

#calib-map {
  position: absolute;
  left: 50%;
  bottom: 7vh;
  transform: translateX(-50%);
  width: 88px;
  height: 56px;
}

.calib-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mute);
  transform: translate(-50%, -50%);
}

.calib-dot.done {
  background: var(--fog);
}

.calib-dot.current {
  background: var(--signal);
  box-shadow: 0 0 10px var(--signal);
}

#calib-esc {
  position: absolute;
  right: 2.5vw;
  top: 3.5vh;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
}

#stage.calibrating #hint {
  opacity: 0;
}

.field {
  display: block;
  margin-top: 0.75rem;
  font-size: 0.7rem;
  color: var(--mute);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

#camera-select,
#resolution-select {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.28rem 0.35rem;
  color: var(--fog);
  background: rgba(12, 13, 16, 0.55);
  border: 1px solid var(--mute);
  font: inherit;
  font-size: 0.7rem;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 0.85rem;
  font-size: 0.7rem;
  color: var(--mute);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
}

.toggle-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1.15rem;
  margin-top: 0.85rem;
}

.toggle-row .toggle {
  margin-top: 0;
}

.toggle input {
  appearance: none;
  width: 14px;
  height: 14px;
  margin: 0;
  border: 1px solid var(--mute);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
}

.toggle input:checked {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: inset 0 0 0 2px var(--ink);
}

#quote {
  position: absolute;
  left: 50%;
  top: 72%;
  z-index: 5;
  width: min(84vw, 42rem);
  transform: translateX(-50%);
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 280ms ease;
  color: rgba(20, 16, 80, 0.92);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  text-wrap: balance;
}

#stage.on.quote-on #quote {
  opacity: 1;
}

#quote-text {
  font-size: clamp(1.425rem, 3.6vw, 2.025rem);
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.01em;
  min-height: 1.45em;
}

#quote-attr {
  margin-top: 0.65rem;
  font-size: clamp(0.93rem, 2.1vw, 1.17rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  opacity: 0;
  transition: opacity 400ms ease;
}

#stage.on.quote-on #quote.attr-on #quote-attr {
  opacity: 0.85;
}

#hint {
  position: absolute;
  right: max(2.5vw, env(safe-area-inset-right));
  bottom: max(3.5vh, env(safe-area-inset-bottom));
  z-index: 5;
  font-size: 0.68rem;
  color: var(--mute);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
  transition: opacity 400ms;
}

body:fullscreen #hint,
body:-webkit-full-screen #hint {
  opacity: 0;
}

#build {
  position: absolute;
  left: 50%;
  bottom: max(1.1vh, env(safe-area-inset-bottom));
  z-index: 6;
  transform: translateX(-50%);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
  opacity: 0.55;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 200ms ease;
}