/* Botón scroll-to-top */
.scroll-to-top {
  position: fixed;
  left: 2rem;
  bottom: 2rem;
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  cursor: pointer;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s, transform 0.3s;
}
.scroll-to-top.show {
  opacity: 1;
  pointer-events: auto;
}
.scroll-to-top:hover {
  background: var(--secondary);
  color: #fff;
  transform: translateY(-3px);
}

/* Ajustes para móvil */
@media (max-width: 900px) {
  .scroll-to-top {
    left: 1rem;
    bottom: 5.5rem; /* Arriba del WhatsApp */
    width: 48px;
    height: 48px;
    font-size: 1.5rem;
    box-shadow: 0 4px 20px rgba(230, 57, 70, 0.4);
  }
}