body {
  margin: 0;
  padding: 20px;
  font-family: 'Arial', sans-serif;
  background: #1a1a1a;
  color: #fff;
}

.container {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 20px;
  height: 100vh;
}

.controls {
  background: #2a2a2a;
  padding: 20px;
  border-radius: 8px;
}

.charts {
  display: grid;
  grid-template-rows: 1fr 1fr;
  gap: 20px;
}

canvas {
  background: #2a2a2a;
  border-radius: 8px;
  padding: 15px;
}

button {
  background: #4CAF50;
  border: none;
  padding: 10px 20px;
  color: white;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #45a049;
}