/* Botón subir arriba */
.back-to-top {
  position: fixed;
  bottom: 40px;
  right: 40px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #c9a86a;
  color: #0b0b0d;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.35s ease,
    transform 0.35s ease;
  box-shadow: 0 0 18px rgba(201, 168, 106, 0.35);
  z-index: 999;
}

.back-to-top:hover {
  background: #e3c68b;
  transform: translateY(-4px);
}

/* Visible */
.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
}