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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  color: #fff;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

#vr-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* The raw camera feed is only a texture source for the canvas */
#camera {
  position: fixed;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.divider {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  margin-left: -1px;
  background: rgba(255, 255, 255, 0.35);
  pointer-events: none;
  display: none;
}

body.running .divider.visible {
  display: block;
}

/* Full-screen overlays */
.screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: #000;
  z-index: 20;
  text-align: center;
}

.screen[hidden] {
  display: none;
}

.card {
  max-width: 420px;
  width: 100%;
}

.card h1 {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.card p {
  color: #bbb;
  line-height: 1.5;
  margin-bottom: 16px;
}

.card ol {
  text-align: left;
  color: #ddd;
  line-height: 1.6;
  margin: 0 auto 24px;
  padding-left: 20px;
  max-width: 320px;
}

button {
  font: inherit;
  color: #fff;
  background: #333;
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  cursor: pointer;
}

button.primary {
  background: #1a73e8;
}

#start-btn {
  font-size: 1.2rem;
  padding: 14px 36px;
  border-radius: 999px;
}

.error {
  margin-top: 16px;
  color: #ff8a80 !important;
}

.rotate-icon {
  font-size: 4rem;
  margin-bottom: 12px;
  animation: spin 2s ease-in-out infinite;
}

@keyframes spin {
  0%, 30% { transform: rotate(0deg); }
  70%, 100% { transform: rotate(90deg); }
}

/* Controls overlay */
.controls {
  position: fixed;
  top: max(10px, env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

body.running.show-controls .controls {
  opacity: 1;
  pointer-events: auto;
}

.icon-btn {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: 50%;
  font-size: 1.3rem;
  background: rgba(0, 0, 0, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Settings panel */
.settings {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(360px, calc(100% - 32px));
  max-height: calc(100% - 32px);
  overflow-y: auto;
  background: rgba(20, 20, 20, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  padding: 16px 18px;
  z-index: 15;
}

.settings[hidden] {
  display: none;
}

.settings h2 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.settings label {
  display: flex;
  margin: 10px 0;
  font-size: 0.95rem;
}

.settings label.row {
  justify-content: space-between;
  align-items: center;
}

.settings label.col {
  flex-direction: column;
  gap: 6px;
}

.settings output {
  color: #8ab4f8;
  margin-left: 6px;
}

.settings input[type="range"] {
  width: 100%;
}

.settings .note {
  color: #999;
  font-size: 0.8rem;
}

.settings .note[hidden] {
  display: none;
}

.settings input[type="checkbox"] {
  width: 20px;
  height: 20px;
}

.settings-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 14px;
}