/* ==========================================================================
   143 — Accordion Flow
   Accordéon exclusif 100 % CSS. L'état vit dans des radios cachés (label
   englobant → pas d'id/for, exclusivité native par name partagé, flèches
   clavier gratuites). L'ouverture est fluide dans les DEUX sens : le panel
   est une grid dont la rangée passe de 0fr à 1fr (hauteur réelle
   interpolée, pas de max-height). Chevron avec overshoot, contenu en
   fade + translate retardé, liseré accent qui se déploie sur la section
   active. Aucun JavaScript.
   ========================================================================== */

.accordion-flow {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 300px;
  max-width: 100%;
}

.accordion-flow__item {
  position: relative;
  border-radius: 10px;
  background: var(--ml-surface, #151a24);
  border: 1px solid color-mix(in srgb, var(--ml-muted, #8b91a3) 16%, transparent);
  overflow: hidden; /* clippe le liseré et arrondit le panel */
  transition: border-color 0.3s ease;
}

.accordion-flow__item:has(.accordion-flow__input:checked) {
  border-color: color-mix(in srgb, var(--ml-accent, #7c8cff) 45%, transparent);
}

/* Liseré accent : se déploie du haut vers le bas sur la section active */
.accordion-flow__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(
    180deg,
    var(--ml-accent, #7c8cff),
    var(--ml-accent-2, #2dd4bf)
  );
  transform: scaleY(0);
  transform-origin: 50% 0;
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.accordion-flow__item:has(.accordion-flow__input:checked)::before {
  transform: scaleY(1);
}

/* --- En-tête ----------------------------------------------------------------- */

.accordion-flow__input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.accordion-flow__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 14px;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
}

.accordion-flow__head:has(.accordion-flow__input:focus-visible) {
  outline: 2px solid var(--ml-accent, #7c8cff);
  outline-offset: -2px;
  border-radius: 10px;
}

.accordion-flow__title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ml-fg, #e8eaf2);
  transition: color 0.25s ease;
}

.accordion-flow__item:has(.accordion-flow__input:checked) .accordion-flow__title {
  color: var(--ml-accent, #7c8cff);
}

/* Chevron : rotation avec overshoot */
.accordion-flow__chevron {
  flex: none;
  width: 16px;
  height: 16px;
  color: var(--ml-muted, #8b91a3);
  transition:
    transform 0.55s cubic-bezier(0.34, 1.56, 0.64, 1),
    color 0.25s ease;
}

.accordion-flow__item:has(.accordion-flow__input:checked) .accordion-flow__chevron {
  transform: rotate(-180deg);
  color: var(--ml-accent, #7c8cff);
}

/* --- Panel : grid-template-rows 0fr ↔ 1fr ------------------------------------- */

.accordion-flow__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

.accordion-flow__item:has(.accordion-flow__input:checked) .accordion-flow__panel {
  grid-template-rows: 1fr;
}

/* L'enfant direct DOIT pouvoir descendre à 0 : min-height + overflow */
.accordion-flow__body {
  min-height: 0;
  overflow: hidden;
}

/* Contenu : fade + translate, retardé à l'ouverture pour laisser la
   hauteur s'installer ; à la fermeture il s'efface immédiatement. */
.accordion-flow__content {
  margin: 0;
  padding: 0 14px 12px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ml-muted, #8b91a3);
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.accordion-flow__item:has(.accordion-flow__input:checked) .accordion-flow__content {
  opacity: 1;
  transform: none;
  transition:
    opacity 0.3s ease 0.16s,
    transform 0.35s cubic-bezier(0.22, 1, 0.36, 1) 0.16s;
}

/* --- Reduced motion ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  .accordion-flow__item,
  .accordion-flow__item::before,
  .accordion-flow__title,
  .accordion-flow__chevron,
  .accordion-flow__panel,
  .accordion-flow__content {
    transition: none;
  }
}