body {
  font-family: Arial, sans-serif;
  background: #f0f0f0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  text-align: center;
  background: #ffffff;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
}

.semaforo {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1rem 0;
}

.luz {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: #cccccc;
  transition: background-color 0.3s;
}

.rojo.activo {
  background-color: red;
}

.amarillo.activo {
  background-color: yellow;
}

.verde.activo {
  background-color: green;
}

#estado-label {
  margin-top: 1rem;
  font-size: 1.2rem;
}