/* 170 — Icon Morph
   Trois boutons ronds à toggle (checkbox :checked). Chaque icône « morphe »
   par chorégraphie de segments — rotation, échelle, opacité, origines
   ancrées via transform-box: fill-box — avec rebond léger
   (cubic-bezier overshoot). Pas d'interpolation de `d` : l'illusion vient
   du recouvrement temporel des segments. Ripple discret au clic (:active).
   Sans JS. Reduced motion : bascule instantanée, ripple coupé. */

.icon-morph {
  --icon-morph-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
}

.icon-morph__row {
  display: flex;
  gap: 16px;
}

/* ——— Bouton rond ——— */

.icon-morph__btn {
  position: relative;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  overflow: hidden;
  border-radius: 50%;
  cursor: pointer;
  color: var(--ml-fg, #e8eaf2);
  background: var(--ml-surface, #151a24);
  border: 1px solid color-mix(in oklab, var(--ml-fg, #e8eaf2) 10%, transparent);
  -webkit-tap-highlight-color: transparent;
  transition:
    color 0.35s ease,
    border-color 0.35s ease,
    box-shadow 0.35s ease,
    transform 0.25s ease;
}

.icon-morph__btn:hover {
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--ml-accent, #7c8cff) 45%, transparent);
}

.icon-morph__btn:active {
  transform: translateY(0) scale(0.94);
}

.icon-morph__btn:has(.icon-morph__input:focus-visible) {
  outline: 2px solid var(--ml-accent-2, #2dd4bf);
  outline-offset: 2px;
}

.icon-morph__btn:has(.icon-morph__input:checked) {
  color: var(--ml-accent, #7c8cff);
  border-color: color-mix(in oklab, var(--ml-accent, #7c8cff) 55%, transparent);
  box-shadow: 0 4px 18px color-mix(in oklab, var(--ml-accent, #7c8cff) 20%, transparent);
}

.icon-morph__input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

/* ——— Ripple discret au clic ——— */

.icon-morph__ripple {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(
    circle,
    color-mix(in oklab, var(--ml-accent, #7c8cff) 28%, transparent) 0%,
    transparent 68%
  );
  transform: scale(0.3);
  opacity: 0;
  transition: transform 0.55s ease, opacity 0.6s ease;
}

.icon-morph__btn:active .icon-morph__ripple {
  transform: scale(1.6);
  opacity: 1;
  transition: transform 0.28s ease, opacity 0.12s ease;
}

/* ——— Segments SVG ——— */

.icon-morph__svg {
  display: block;
  width: 24px;
  height: 24px;
}

.icon-morph__part {
  transform-box: fill-box;
  transform-origin: center;
  transition:
    transform 0.5s var(--icon-morph-bounce, cubic-bezier(0.34, 1.56, 0.64, 1)),
    opacity 0.28s ease;
}

/* — 1. Play → Pause : le triangle vrille et cède la place aux barres — */

.icon-morph__pause {
  transform: rotate(-90deg) scale(0.3);
  opacity: 0;
}

.icon-morph__input:checked ~ .icon-morph__svg .icon-morph__play {
  transform: rotate(90deg) scale(0.3);
  opacity: 0;
}

.icon-morph__input:checked ~ .icon-morph__svg .icon-morph__pause {
  transform: none;
  opacity: 1;
  transition-delay: 0.07s;
}

/* — 2. Plus → Croix : vrai morph, rotation 135° avec rebond — */

.icon-morph__input:checked ~ .icon-morph__svg .icon-morph__plus {
  transform: rotate(135deg);
}

/* — 3. Loupe → Flèche : la lentille s'escamote, le manche devient fût — */

.icon-morph__arrow-shaft {
  transform: scaleX(0);
  transform-origin: left center;
}

.icon-morph__arrow-head {
  transform: scale(0);
  opacity: 0;
}

.icon-morph__arrow-head--haut { transform-origin: 100% 100%; }
.icon-morph__arrow-head--bas  { transform-origin: 100% 0%; }

.icon-morph__input:checked ~ .icon-morph__svg .icon-morph__lens {
  transform: rotate(-90deg) scale(0.25);
  opacity: 0;
}

.icon-morph__input:checked ~ .icon-morph__svg .icon-morph__arrow-shaft {
  transform: scaleX(1);
  transition-delay: 0.1s;
}

.icon-morph__input:checked ~ .icon-morph__svg .icon-morph__arrow-head {
  transform: scale(1);
  opacity: 1;
  transition-delay: 0.2s;
}

/* ——— Légende ——— */

.icon-morph__caption {
  margin: 0;
  font: 500 10.5px/1 system-ui, -apple-system, sans-serif;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ml-muted, #8b91a3);
}

/* ——— Reduced motion : bascule instantanée, pas de ripple ——— */

@media (prefers-reduced-motion: reduce) {
  .icon-morph__btn,
  .icon-morph__part {
    transition: none;
  }
  .icon-morph__ripple {
    display: none;
  }
}