:root {
  --color-background: #f7f8fa;
  --color-text: #666;
  --color-primary: #174ea6;
  --color-primary-hover: #2563eb;
  --color-white: #fff;
  --color-grey-light: #ccc;
  --color-grey-medium: #aaa;
  --color-grey-dark: #666;
  --color-consent-bg: #fffbe6;
  --color-consent-border: #ffe58f;
  --color-shadow: rgba(23, 78, 166, 0.10);

  --border-radius: 18px;
  --thumbnail-size-for-modelviewer: 50px;
}

body {
  margin: 0;
  font-family: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  background: var(--color-background);
  color: var(--color-grey-dark);
  min-height: 100vh;
  display: flex;
  align-items: center;
  flex-direction: column;
}

code {
  font-size: 0.9em;
}

em {
  font-size: 0.9em;
  font-weight: 600;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-grey-light);
  transition: text-decoration-color 0.2s;
}

a:hover {
  text-decoration-color: inherit;
}

.consent {
  background: var(--color-consent-bg);
  border: 1px solid var(--color-consent-border);
  border-radius: 10px;
  padding: 0.8em;
  margin: 1em;
  font-size: 1.1rem;
  max-width: 500px;
  text-align: center;
}

#load-script-btn {
  display: block;
  margin: 1em auto;
  margin-bottom: 0.2em;
  padding: 0.8em 1.2em;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  box-shadow: 0 2px 8px var(--color-shadow);
  cursor: pointer;
  transition: background 0.2s, border 0.2s;
}

#load-script-btn:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

#load-script-btn:focus,
.model-thumb:focus,
#fullscreen-btn:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

#viewer-container {
  display: grid;
  place-items: center;
  margin: 1em auto;
  /* Prevent scrolling while allowing model viewer touch interactions */
  touch-action: pan-x pan-y pinch-zoom;
}

#viewer-container>* {
  grid-area: 1 / 1;
}

#model-placeholder {
  display: block;
  opacity: 1;
  transition: opacity 1s ease;
  width: 40vh;
  max-width: 90vw;
}

model-viewer {
  height: 80vh;
  width: 95vw;
  max-width: 80vh;
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  opacity: 0;
  transition: opacity 1s ease;
  /* Ensure model-viewer handles its own touch events */
  touch-action: manipulation;
}

#model-thumbnails {
  display: flex;
  gap: 1em;
  justify-content: center;
  align-items: center;
  padding: 1em;
}

.model-thumb {
  width: 80px;
  cursor: pointer;
  border: 2px solid var(--color-grey-light);
  border-radius: 8px;
  transition: border-color 0.2s ease-in-out, width 0.3s ease-in-out;
}

.model-thumb.selected {
  border-color: var(--color-primary);
}

.model-active .model-thumb {
  width: var(--thumbnail-size-for-modelviewer);
}

.fullscreen-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1em;
}

#fullscreen-btn {
  height: var(--thumbnail-size-for-modelviewer);
  padding: 0 1.5em;
  font-size: 0.9em;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  cursor: pointer;
  display: none;
  align-items: center;
  transition: background 0.2s, border 0.2s;
}

#fullscreen-btn:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

/* Loading states */
.loading {
  cursor: wait;
}

.loading .model-thumb {
  opacity: 0.5;
  pointer-events: none;
}

#desktop-controls-info,
#mobile-controls-info {
  font-size: 0.8em;
  color: var(--color-grey-dark);
}

footer {
  max-width: 90vw;
  text-align: center;
  margin: 0.1em auto 0;
  padding: 0.1em 0 max(1em, env(safe-area-inset-bottom));
  margin-top: auto;
}

footer p {
  font-size: 0.75em;
}