/* =============================================================================
   Flip card — Aspaldiko
   Card volteable (Residencia / Centro de día en Quiénes Somos).
   Desktop: voltea en hover/focus (CSS). Mobile/teclado: clase .is-flipped (JS).
   Respeta prefers-reduced-motion (cross-fade en vez de giro 3D).

   Markup esperado (lo marca la Tanda C):
     <article class="flip" data-flip>
       <div class="flip__inner">
         <div class="flip__face flip__face--front" ... role="button" tabindex="0"
              aria-expanded="false">…frente…</div>
         <div class="flip__face flip__face--back">…reverso…</div>
       </div>
     </article>
   Si NO hay .flip__face--back, la Tanda C no añade [data-flip] → card estática.
   ========================================================================== */

.flip {
  perspective: 1200px;
  border-radius: var(--radius-lg);
}

.flip__inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 16rem;
  transition: transform var(--t-slow);
  transform-style: preserve-3d;
}

/* Volteo en desktop: hover o foco dentro de la card (sin JS).
   En mobile/teclado el JS togglea .is-flipped. */
.flip:hover .flip__inner,
.flip:focus-within .flip__inner,
.flip.is-flipped .flip__inner {
  transform: rotateY(180deg);
}

.flip__face {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-6);
}

.flip__face--front {
  background: var(--color-mint);
  color: var(--color-text);
  cursor: pointer;
}

.flip__face--back {
  background: var(--color-burgundy);
  color: #fff;
  transform: rotateY(180deg);
}

.flip__face--back a {
  color: #fff;
  text-decoration: underline;
}

/* Foco visible coherente con el resto del theme (reset.css). */
.flip__face--front:focus-visible {
  outline: 2px solid var(--color-burgundy);
  outline-offset: 2px;
}

/* Pista visual de "tiene reverso". */
.flip__hint {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-pill);
  color: var(--color-burgundy);
}

/* === Reduced motion: cross-fade plano, sin giro 3D ===
   El JS añade .flip--reduced cuando matchMedia('(prefers-reduced-motion)')
   está activo; aquí desactivamos el rotateY y mostramos/ocultamos por opacidad. */
@media (prefers-reduced-motion: reduce) {
  .flip__inner {
    transition: none;
  }

  .flip:hover .flip__inner,
  .flip:focus-within .flip__inner,
  .flip.is-flipped .flip__inner {
    transform: none;
  }

  .flip__face {
    transition: opacity var(--t-base);
  }

  .flip__face--back {
    transform: none;
    opacity: 0;
    pointer-events: none;
  }

  .flip:hover .flip__face--back,
  .flip:focus-within .flip__face--back,
  .flip.is-flipped .flip__face--back {
    opacity: 1;
    pointer-events: auto;
  }

  .flip:hover .flip__face--front,
  .flip:focus-within .flip__face--front,
  .flip.is-flipped .flip__face--front {
    opacity: 0;
    pointer-events: none;
  }
}