/* Modal de alerta */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
}
.modal-content {
  background-color: var(--background);
  margin: 10% auto;
  padding: 2rem;
  border-radius: var(--radius);
  max-width: 400px;
  position: relative;
  text-align: center;
}
.modal-content button {
  margin-top: 1rem;
  background-color: var(--primary);
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}
.modal-content button:hover {
  background-color: var(--secondary);
}