/* ==========================================================================
   007 — Download Morph · boutons
   Le classique : clic → le label fond (blur + descente), le bouton se
   contracte en fine barre de progression, une flèche tombe en boucle
   pendant que le remplissage avance par paliers irréguliers (anim.js),
   à 100 % le bouton se regonfle en état succès (check stroke-draw +
   « Terminé »), puis reset auto. Rejouable à l'infini.
   Préfixe de classes : .dl-morph (abréviation du slug download-morph).
   ========================================================================== */

.dl-morph {
  --dl-morph-accent: var(--ml-accent, #7c8cff);
  --dl-morph-success: var(--ml-accent-2, #2dd4bf);
  --dl-progress: 0; /* 0 → 1, pilotée par anim.js */

  position: relative;
  display: inline-block;
  width: 220px;
  height: 52px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ml-bg, #0d1017);
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 650;
  letter-spacing: 0.02em;
  line-height: 1;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.dl-morph:focus-visible {
  outline: none;
}

.dl-morph:focus-visible .dl-morph__pill {
  outline: 2px solid var(--ml-accent-2, #2dd4bf);
  outline-offset: 3px;
}

.dl-morph:active .dl-morph__pill {
  transform: scale(0.98);
}

/* --- Pastille visuelle (c'est elle qui morphe) ------------------------------ */

.dl-morph__pill {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 100%;
  height: 100%;
  border-radius: 26px;
  overflow: hidden;
  background: linear-gradient(
    140deg,
    var(--dl-morph-accent),
    color-mix(in srgb, var(--dl-morph-accent) 70%, var(--ml-accent-2, #2dd4bf))
  );
  transition:
    width 0.45s cubic-bezier(0.65, 0, 0.35, 1),
    height 0.45s cubic-bezier(0.65, 0, 0.35, 1),
    border-radius 0.45s cubic-bezier(0.65, 0, 0.35, 1),
    background-color 0.4s ease,
    transform 0.2s ease,
    box-shadow 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.dl-morph:hover .dl-morph__pill {
  box-shadow: 0 12px 32px -12px color-mix(in srgb, var(--dl-morph-accent) 70%, transparent);
}

.dl-morph--loading .dl-morph__pill {
  width: 82%;
  height: 6px;
  border-radius: 3px;
  background: color-mix(in srgb, var(--ml-fg, #e8eaf2) 14%, var(--ml-surface, #151a24));
  box-shadow: none;
}

.dl-morph--done .dl-morph__pill {
  background: var(--dl-morph-success);
  box-shadow: 0 12px 34px -12px color-mix(in srgb, var(--dl-morph-success) 70%, transparent);
}

/* --- Remplissage -------------------------------------------------------------- */

.dl-morph__fill {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--dl-morph-accent), var(--dl-morph-success));
  transform: scaleX(var(--dl-progress));
  transform-origin: left center;
  opacity: 0;
  transition:
    transform 0.4s cubic-bezier(0.25, 1, 0.5, 1),
    opacity 0.25s ease;
}

.dl-morph--loading .dl-morph__fill {
  opacity: 1;
}

/* --- Label idle : il « fond » au départ ---------------------------------------- */

.dl-morph__label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  transition:
    opacity 0.28s ease,
    transform 0.34s cubic-bezier(0.55, 0, 0.55, 0.2),
    filter 0.28s ease;
}

.dl-morph--loading .dl-morph__label,
.dl-morph--done .dl-morph__label {
  opacity: 0;
  transform: translateY(10px) scale(0.94);
  filter: blur(4px);
}

.dl-morph__icon {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* --- Flèche qui tombe en boucle pendant le chargement --------------------------- */

.dl-morph__arrow {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 18px;
  height: 18px;
  margin: -24px 0 0 -9px; /* boucle au-dessus de la barre */
  fill: none;
  stroke: var(--ml-fg, #e8eaf2);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0;
  pointer-events: none;
}

.dl-morph--loading .dl-morph__arrow {
  animation: dl-morph-drop 0.75s cubic-bezier(0.5, 0, 0.75, 0.6) infinite;
}

@keyframes dl-morph-drop {
  0% { transform: translateY(-10px); opacity: 0; }
  30% { opacity: 1; }
  78% { opacity: 1; }
  100% { transform: translateY(14px); opacity: 0; }
}

/* --- Pourcentage ---------------------------------------------------------------- */

.dl-morph__pct {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  font-size: 0.7rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--ml-muted, #8b91a3);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}

.dl-morph--loading .dl-morph__pct {
  opacity: 1;
  transform: translateY(0);
}

/* --- État succès ------------------------------------------------------------------ */

.dl-morph__done {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s ease, transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  pointer-events: none;
}

.dl-morph--done .dl-morph__done {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.22s; /* laisse la pastille se regonfler d'abord */
}

.dl-morph__check {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}

.dl-morph--done .dl-morph__check {
  animation: dl-morph-check 0.45s cubic-bezier(0.3, 1.2, 0.5, 1) 0.3s both;
}

@keyframes dl-morph-check {
  from { stroke-dashoffset: 1; }
  to { stroke-dashoffset: 0; }
}

/* --- Wrapper de démo (galerie) ----------------------------------------------------- */

.dl-morph-demo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.dl-morph-hint {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--ml-muted, #8b91a3);
}

/* --- Accessibilité ------------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  .dl-morph__pill,
  .dl-morph__label,
  .dl-morph__done,
  .dl-morph__pct {
    transition-duration: 0.15s;
  }

  .dl-morph__label {
    filter: none;
  }

  .dl-morph--loading .dl-morph__label {
    transform: none;
    filter: none;
  }

  .dl-morph--loading .dl-morph__arrow {
    animation: none; /* pas de boucle : le pourcentage suffit */
  }

  .dl-morph__fill {
    transition: opacity 0.15s ease; /* le remplissage saute de palier en palier */
  }

  .dl-morph--done .dl-morph__check {
    animation: none;
    stroke-dashoffset: 0;
  }
}