/*
 * Refonte — bouton « retour en haut » : cercle blanc, flèche verte,
 * anneau vert qui se remplit au fur et à mesure du défilement de la page.
 * Le bouton est créé par retour-haut.js ; l'ancien bouton du footer (.back-to-top) est masqué.
 */

.back-to-top { display: none !important; }

.aj-top {
  --aj-top-size: 52px;
  --aj-top-progress: 0;

  position: fixed;
  right: var(--space-6, 24px);
  bottom: var(--space-6, 24px);
  z-index: 996;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--aj-top-size);
  height: var(--aj-top-size);
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--blanc, #fff);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  color: var(--vert-action, #198754);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.85);
  transition:
    opacity 250ms ease,
    transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1),
    visibility 0s linear 300ms,
    background-color 180ms ease,
    color 180ms ease;
}

.aj-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition:
    opacity 250ms ease,
    transform 300ms cubic-bezier(0.34, 1.56, 0.64, 1),
    visibility 0s,
    background-color 180ms ease,
    color 180ms ease;
}

/* Anneau : piste grise + arc vert dont la longueur suit le défilement (pathLength = 100) */
.aj-top__ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  transform: rotate(-90deg); /* l'arc démarre en haut */
}

.aj-top__ring circle {
  fill: none;
  stroke-width: 3;
}

.aj-top__track { stroke: rgba(25, 135, 84, 0.15); }

.aj-top__bar {
  stroke: var(--vert-action, #198754);
  stroke-linecap: round;
  stroke-dasharray: 100;
  stroke-dashoffset: calc(100 - var(--aj-top-progress));
  transition: stroke-dashoffset 80ms linear;
}

.aj-top .bi {
  position: relative;
  font-size: 20px;
  line-height: 1;
  transition: transform 200ms ease;
}

.aj-top:hover {
  background: var(--vert-action, #198754);
  color: var(--blanc, #fff);
}

.aj-top:hover .aj-top__track { stroke: rgba(255, 255, 255, 0.3); }
.aj-top:hover .aj-top__bar { stroke: var(--blanc, #fff); }
.aj-top:hover .bi { transform: translateY(-2px); }

.aj-top:focus-visible {
  outline: 2px solid var(--vert-action, #198754);
  outline-offset: 3px;
}

/* Le badge reCAPTCHA de Google occupe déjà le coin bas-droit : on se place au-dessus */
body:has(.grecaptcha-badge) .aj-top { bottom: 92px; }

@media (max-width: 767.98px) {
  .aj-top {
    --aj-top-size: 46px;
    right: var(--space-4, 16px);
    bottom: var(--space-4, 16px);
  }

  body:has(.grecaptcha-badge) .aj-top { bottom: 84px; }
}

@media (prefers-reduced-motion: reduce) {
  .aj-top,
  .aj-top.is-visible,
  .aj-top__bar,
  .aj-top .bi { transition: none; }
}