/* ==========================================================================
   Componente: Back to Top
   Boton flotante global, aparece tras la 3ra Experiencia (o fallback de scroll)
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--amber, #e2a24a);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.8);
  box-shadow: 0 4px 16px rgba(11, 9, 8, 0.35);
  z-index: 40;
  transition: background-color 0.25s ease, box-shadow 0.25s ease;
}

.back-to-top:hover {
  background-color: var(--copper, #c8843a);
  box-shadow: 0 6px 20px rgba(11, 9, 8, 0.45);
}

.back-to-top__icono {
  width: 20px;
  height: 20px;
  stroke: var(--ink, #0b0908);
  stroke-width: 2.5;
  fill: none;
}

@media (max-width: 700px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 46px;
    height: 46px;
  }

  .back-to-top__icono {
    width: 17px;
    height: 17px;
  }
}