html,body{
    height:100%;
    margin:0;
    background:#000;
    overflow:hidden;
    font-family:Arial,Helvetica,sans-serif;
  }
  #wrap{
    position:relative;
    height:100vh;
    width:100vw;
  }
  canvas{
    display:block;
  }
  .ui {
    position: absolute;
    top: 12px;
    right: 12px;
    color: #fff;
    font-size: 13px;
    background: rgba(255,255,255,0.06);
    padding: 8px 10px;
    border-radius: 8px;
    backdrop-filter: blur(4px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.6);
  }
  .ui label{
    display:inline-flex;
    align-items:center;
    gap:8px;
    cursor:pointer;
  }
  .ui input[type=range]{
    vertical-align:middle;
  }
  .hint {
    position:absolute;
    left:12px;
    bottom:12px;
    color:#ddd;
    font-size:13px;
    opacity:0.85;
    background:rgba(0,0,0,0.25);
    padding:6px 10px;
    border-radius:6px;
  }