body {
  margin: 0;
  padding: 0;
  background: #0d0d0d;
  color: #ffffff;
  font-family: Arial, sans-serif;
  display: flex;
  height: 100vh;
}

.controls {
  width: 300px;
  padding: 20px;
  background: #111;
  box-shadow: 0 0 10px rgba(0,0,0,0.6);
}

.controls h2 {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 15px;
}

input[type="range"] {
  width: 100%;
}

button {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  background: #1e90ff;
  border: none;
  color: white;
  font-size: 16px;
  cursor: pointer;
}

button:hover {
  background: #187bcd;
}

button.active {
  background: #00c853;
  color: #000;
  font-weight: bold;
}

canvas {
  background: #000;
  margin: 20px;
  border: 1px solid #333;
  flex-grow: 1;
  height: calc(100vh-40px)
}