.modal-enter { animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards; }

@keyframes slideUp {
    from { opacity: 0; transform: translateY(50px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Flip card: hover (solo con mouse), foco de teclado y toque */
.flip-group { perspective: 1000px; }
.flip-inner {
    position: relative; width: 100%; height: 100%; text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}
@media (hover: hover) { .flip-group:hover .flip-inner { transform: rotateY(180deg); } }
.flip-group:focus-within .flip-inner, .flip-group:focus .flip-inner { transform: rotateY(180deg); }

.flip-front, .flip-back {
    position: absolute; inset: 0; width: 100%; height: 100%;
    -webkit-backface-visibility: hidden; backface-visibility: hidden;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
}
.flip-front {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-panel);
}
.flip-back {
    transform: rotateY(180deg);
    background-color: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-panel);
    padding: 0.75rem;
    color: var(--text-muted);
}

/* Aparición al hacer scroll (la activa main.js solo si hay IntersectionObserver) */
.reveal-ready .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.16, 1, 0.3, 1); transition-delay: var(--d, 0s); }
.reveal-ready .reveal.in { opacity: 1; transform: none; }