body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: #4CAF50;
  color: white;
  padding: 1em;
  text-align: center;
}

main {
  flex: 1;
  padding: 1em;
  background-color: #f4f4f4;
}

footer {
  background-color: #333;
  color: white;
  text-align: center;
  padding: 1em;
}

.controls {
  display: flex;
  justify-content: center;
  margin-bottom: 1em;
}

.controls label {
  margin-right: 1em;
}

.dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1em;
}

.metric {
  background: white;
  padding: 1em;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  text-align: center;
}

.chart-container {
  position: relative;
  width: 100%;
  height: 300px;
}