* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: #111;
  font-family: system-ui, sans-serif;
  color: #eee;
}

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

.controls {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

button {
  background: #222;
  border: 1px solid #444;
  color: #eee;
  padding: 12px 24px;
  font-size: 14px;
  cursor: pointer;
  font-family: system-ui, sans-serif;
}

button:hover {
  background: #333;
  border-color: #666;
}

button:active {
  background: #444;
}

.track-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #222;
  border: 1px solid #444;
  padding: 8px 12px;
}

.track-controls button {
  padding: 8px 12px;
  min-width: 40px;
  font-size: 16px;
}

#trackTitle {
  flex: 1;
  text-align: center;
  font-size: 14px;
  color: #4a9eff;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slider-control {
  background: #222;
  border: 1px solid #444;
  padding: 12px;
  font-size: 14px;
}

.slider-control label {
  display: block;
  margin-bottom: 8px;
  color: #eee;
}

#correlationValue {
  color: #4a9eff;
  font-weight: 600;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  background: #444;
  outline: none;
  border-radius: 2px;
  -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: #4a9eff;
  cursor: pointer;
  border-radius: 50%;
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: #4a9eff;
  cursor: pointer;
  border-radius: 50%;
  border: none;
}

input[type="range"]:hover::-webkit-slider-thumb {
  background: #6bb0ff;
}

input[type="range"]:hover::-moz-range-thumb {
  background: #6bb0ff;
}

.info {
  background: rgba(0, 0, 0, 0.7);
  padding: 8px 12px;
  font-size: 12px;
  border: 1px solid #333;
}

#status {
  opacity: 0.8;
}

@media (max-width: 600px) {
  .controls {
    top: 10px;
    left: 10px;
  }

  button {
    padding: 10px 18px;
    font-size: 13px;
  }
}