body {
  background: #111;
  color: #eee;
  font-family: 'Orbitron', sans-serif;
  text-align: center;
}

h1 {
  color: #0ff;
  text-shadow: 0 0 10px #0ff;
}

#controls {
  margin-top: 20px;
}

label {
  display: block;
  margin: 15px;
  padding: 10px;
  background: #222;
  border-radius: 8px;
  box-shadow: 0 0 10px #333 inset;
}

input[type="number"], input[type="range"] {
  margin: 5px;
}

#play, #pause {
  font-size: 18px;
  padding: 10px 20px;
  margin: 10px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  color: #fff;
  background: #333;
  transition: all 0.3s ease;
}

#play.active {
  background: #0f0;
  box-shadow: 0 0 20px #0f0;
}

#pause.active {
  background: #f00;
  box-shadow: 0 0 20px #f00;
}

span {
  margin-left: 10px;
  font-weight: bold;
  color: #0ff;
  text-shadow: 0 0 5px #0ff;
}

.vu-meter {
  display: inline-block;
  width: 100px;
  height: 10px;
  background: #333;
  border-radius: 5px;
  overflow: hidden;
  vertical-align: middle;
  margin-left: 10px;
}

.vu-fill {
  height: 100%;
  background: linear-gradient(90deg, #0f0, #ff0, #f00);
  width: 0%;
  transition: width 0.2s ease;
}

#warning {
  margin-top: 20px;
  color: #ff0;
  font-weight: bold;
  text-shadow: 0 0 10px #f00;
  display: none;
}

canvas {
  margin-top: 30px;
  background: #000;
  border: 2px solid #0ff;
}