:root {
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
  background: #e8e6e1;
}

* {
  box-sizing: border-box;
}

html,
body,
.viewer-shell {
  width: 100%;
  height: 100%;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
}

body {
  position: fixed;
  inset: 0;
  overscroll-behavior: none;
}

.viewer-shell {
  position: relative;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.94) 0, rgba(242, 241, 237, 0.8) 34%, rgba(218, 216, 210, 0.9) 100%);
}

.viewport,
.viewport canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.viewport canvas {
  cursor: grab;
  outline: none;
  touch-action: none;
}

.viewport canvas:active {
  cursor: grabbing;
}

.loading {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(280px, calc(100vw - 48px));
  transform: translate(-50%, -50%);
  text-align: center;
  color: #242424;
  transition: opacity 220ms ease;
}

.loading.is-hidden {
  pointer-events: none;
  opacity: 0;
}

.loading-label {
  margin-bottom: 12px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.progress-track {
  height: 2px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.18);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: #151515;
  transition: width 120ms linear;
}

.progress-text {
  min-height: 1.2em;
  margin-top: 9px;
  color: #666;
  font-size: 0.69rem;
}

.error-panel {
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(300px, calc(100vw - 40px));
  transform: translate(-50%, -50%);
  border: 1px solid #222;
  padding: 22px;
  text-align: center;
  background: rgba(255, 255, 255, 0.94);
}

.error-panel p {
  margin: 0 0 14px;
}

.error-panel button,
.controls button,
.carousel-arrow {
  appearance: none;
  border: 1px solid rgba(0, 0, 0, 0.55);
  border-radius: 0;
  color: #222;
  background: rgba(255, 255, 255, 0.82);
  cursor: pointer;
}

.error-panel button {
  padding: 8px 12px;
  font: inherit;
}

.controls {
  position: absolute;
  top: max(14px, env(safe-area-inset-top));
  right: max(14px, env(safe-area-inset-right));
  display: flex;
  gap: 8px;
  opacity: 0;
  transition: opacity 200ms ease;
}

.viewer-shell.is-ready .controls,
.viewer-shell.is-ready .carousel-arrow,
.viewer-shell.is-ready .model-caption {
  opacity: 1;
}

.controls button {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  padding: 9px;
  backdrop-filter: blur(8px);
}

.controls button:hover,
.controls button:focus-visible,
.carousel-arrow:hover,
.carousel-arrow:focus-visible,
.error-panel button:hover,
.error-panel button:focus-visible {
  color: #fff;
  background: #222;
  outline: none;
}

.controls svg,
.carousel-arrow svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-linecap: square;
  stroke-linejoin: miter;
  stroke-width: 1.6;
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  z-index: 4;
  display: grid;
  width: 50px;
  height: 64px;
  place-items: center;
  padding: 13px;
  transform: translateY(-50%);
  opacity: 0;
  backdrop-filter: blur(8px);
  transition: opacity 200ms ease, background-color 150ms ease, color 150ms ease;
}

.carousel-arrow--previous {
  left: max(16px, env(safe-area-inset-left));
}

.carousel-arrow--next {
  right: max(16px, env(safe-area-inset-right));
}

.carousel-arrow:disabled {
  cursor: wait;
  opacity: 0.28;
}

.model-caption {
  position: absolute;
  right: 72px;
  bottom: max(52px, calc(env(safe-area-inset-bottom) + 42px));
  left: 72px;
  z-index: 3;
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms ease;
}

.model-caption h1 {
  margin: 0;
  color: #202020;
  font-size: clamp(0.95rem, 2vw, 1.18rem);
  font-weight: 600;
  letter-spacing: 0.045em;
}

.model-position {
  margin-top: 5px;
  color: rgba(0, 0, 0, 0.5);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
}

.gesture-hint {
  position: absolute;
  bottom: max(12px, env(safe-area-inset-bottom));
  left: 50%;
  padding: 7px 10px;
  transform: translateX(-50%);
  color: rgba(0, 0, 0, 0.62);
  background: rgba(255, 255, 255, 0.64);
  font-size: 0.67rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 200ms ease;
  backdrop-filter: blur(8px);
}

.viewer-shell.is-ready .gesture-hint {
  opacity: 1;
}

.touch-hint {
  display: none;
}

@media (hover: none), (pointer: coarse) {
  .desktop-hint {
    display: none;
  }

  .touch-hint {
    display: inline;
  }
}

@media (max-width: 600px) {
  .carousel-arrow {
    width: 44px;
    height: 56px;
    padding: 11px;
  }

  .carousel-arrow--previous {
    left: max(8px, env(safe-area-inset-left));
  }

  .carousel-arrow--next {
    right: max(8px, env(safe-area-inset-right));
  }

  .model-caption {
    right: 56px;
    left: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .loading,
  .controls,
  .carousel-arrow,
  .model-caption,
  .gesture-hint,
  .progress-track span {
    transition: none;
  }
}