html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  font-family: Arial, sans-serif;
}
#app {
  position: relative;
  width: 100%;
  height: 100%;
}
canvas {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 0;
}
#toolbar {
  position: fixed;
  z-index: 2;
  top: 18px;
  left: 18px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px;
  color: #fff;
  background: rgba(0, 0, 0, 0.72);
  border-radius: 6px;
}
#toolbar button, #toolbar input[type="range"] {
  cursor: pointer;
}
#toolbar button {
  padding: 6px 10px;
}
#connection-status {
  position: fixed;
  z-index: 2;
  left: 18px;
  bottom: 16px;
  padding: 7px 10px;
  color: #fff;
  background: rgba(0, 0, 0, 0.72);
  border-radius: 4px;
  font-size: 13px;
}