/* ===================================
   BOTÓN VOLVER ARRIBA
   =================================== */
.back-to-top {
  position: fixed;

  /* --space-xl: 2rem; */
  bottom: var(--space-xl);
  right: var(--space-xl);

  /* --z-fixed: 1030; */
  z-index: var(--z-fixed);

  width: 50px;
  height: 50px;

  background: var(--gradient-primary);
  color: var(--color-bg-primary);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-large);
  transition: all var(--transition-base);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-large);
}