#controls-ui {
  position: fixed;
  top: 24px;
  right: 24px;
  background: rgba(30, 30, 30, 0.92);
  color: #fff;
  padding: 18px 28px 18px 22px;
  border-radius: 12px;
  font-size: 1.1em;
  font-family: sans-serif;
  box-shadow: 0 2px 16px rgba(0,0,0,0.18);
  z-index: 1100;
  min-width: 210px;
}
#controls-ui h3 {
  margin: 0 0 8px 0;
  font-size: 1.2em;
  letter-spacing: 1px;
}
#controls-ui ul {
  margin: 0;
  padding-left: 18px;
}
#controls-ui li {
  margin-bottom: 4px;
  font-size: 1em;
}
html, body {
  margin: 0;
  height: 100%;
}

#c {
  width: 100%;
  height: 100%;
  display: block;
}

#loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#interact-popup {
  position: fixed;
  left: 50%;
  bottom: 10%;
  transform: translateX(-50%);
  background: rgba(30, 30, 30, 0.92);
  color: #fff;
  padding: 16px 32px;
  border-radius: 12px;
  font-size: 1.5em;
  font-family: sans-serif;
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
  z-index: 1000;
  display: none;
  pointer-events: none;
}