/* Bouton retour en haut - Votre Informaticien */
.back-to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 999px;
  border: 1px solid rgba(226, 232, 240, 0.92);
  background: rgba(255, 255, 255, 0.94);
  color: #0b63f6;
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.16);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease, background 180ms ease, color 180ms ease;
}

.back-to-top svg {
  width: 22px;
  height: 22px;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: #0b63f6;
  color: #ffffff;
  transform: translateY(-2px);
  outline: none;
}

@media (max-width: 767px) {
  .back-to-top {
    right: 16px;
    bottom: 92px; /* au-dessus du bouton d'appel mobile */
    width: 46px;
    height: 46px;
  }
}