.backdrop-grid-min-h { min-height: 30vh; }

.backdrop-sq-12 { width: 3rem; height: 3rem; flex-shrink: 0; }

.backdrop-card-hover {
    transition: transform 0.3s ease;
}

.backdrop-card-hover:hover {
    transform: scale(1.05);
}

/* FAQ v18 — accordion mechanics */
.faq-accordion-panel {
    max-height: 0;
}

.faq-accordion-icon.solver-hints-symbol-reveal {
    transform: rotate(180deg);
}