/* ════════════════════════════════════════════════════
   Bouton « Retour en haut » — Aurore Esthétique
   ════════════════════════════════════════════════════ */

.aurore-back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--ink, #1A332C);
  color: var(--surface, #ECF3EE);
  border: none;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(26, 51, 44, .22);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: opacity .3s ease, transform .3s ease, background .2s;
  z-index: 70;
}
.aurore-back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.aurore-back-to-top:hover {
  background: var(--accent, #2F6B5F);
  transform: translateY(-3px);
}
@media (max-width: 640px) {
  .aurore-back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}