body {
  margin: 0;
  overflow: hidden;
  font-family: Arial, sans-serif;
}

model-viewer {
  width: 100vw;
  height: 100vh;
  display: block;
  touch-action: none;
}

#ar-btn {
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  border: none;
  border-radius: 30px;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  position: absolute;
  top: 80px;
  left: 50%;
  transform: translateX(-50%);
}

#model-label {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  padding: 8px 18px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  border-radius: 20px;
  font-size: 14px;
  pointer-events: none;
  white-space: nowrap;
}

#controls {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 9999;
  display: flex;
  gap: 12px;
}

#controls button {
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  border: none;
  border-radius: 30px;
  font-size: 18px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  user-select: none;
  -webkit-user-select: none;
  transition: background 0.2s;
}

#controls button:active {
  background: rgba(200, 200, 200, 0.95);
}