body {
  margin: 0;
  padding: 20px;
  font-family: Arial, sans-serif;
  background: #f0f0f0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.controls {
  margin-bottom: 20px;
  padding: 20px;
  background: #f8f8f8;
  border-radius: 8px;
}

.input-group {
  margin-bottom: 15px;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input, select {
  width: 100%;
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 14px;
}

button {
  background: #4CAF50;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s;
}

button:hover {
  background: #45a049;
}

#chart {
  height: 600px;
  margin-top: 20px;
}