/* --- Estilos del Botón Subir Scroll --- */
#btn-subir {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: #b91c3c;
  color: white;
  border: none;
  border-radius: 50%;
  width: 3.25rem;
  height: 3.25rem;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: scale(0.8);
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

/* Clase que muestra el botón al hacer scroll */
#btn-subir.show {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

/* Efecto hover */
#btn-subir:hover {
  transform: scale(1.1);
  background-color: #a01729;
}

/* Versión móvil */
@media (max-width: 480px) {
  #btn-subir {
    bottom: 1rem;
    right: 1rem;
    width: 2.75rem;
    height: 2.75rem;
    font-size: 1.25rem;
    box-shadow: 0 0.2rem 0.5rem rgba(0, 0, 0, 0.25);
  }
}