/* Modern FlashCards Design */
.flashcards-container {
    max-width: 1400px;
    margin: 0 auto;
    animation: fadeIn 0.6s ease-out;
}

.flashcard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

/* Modern Flip Card */
.flip-card {
    background-color: transparent;
    perspective: 1000px;
    cursor: pointer;
    position: relative;
    /* Prevent scrolling when clicking */
    -webkit-tap-highlight-color: transparent;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    min-height: 280px;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
    transform-style: preserve-3d;
    /* Keep the card in place */
    will-change: transform;
}

@media (prefers-reduced-motion: reduce) {
    .flip-card-inner {
        transition: transform 0.1s linear;
    }
}

.flip-card-inner.flipped {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    overflow-y: auto;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    /* Ensure cards stay in position */
    top: 0;
    left: 0;
}

.flip-card-front {
    z-index: 2;
    transform: rotateY(0deg);
}

.flip-card-back {
    transform: rotateY(180deg);
    background: var(--color-bg-tertiary);
}

.flip-card-front .card-content,
.flip-card-back .card-content {
    width: 100%;
    position: relative;
    z-index: 1;
}

.flip-card-front h3,
.flip-card-back h3 {
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
}

.flip-card-front p,
.flip-card-back p {
    font-size: 1.125rem;
    line-height: 1.7;
    margin: 0;
    font-weight: 500;
    color: var(--color-text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Hide "click to flip" hint text */
.flip-hint {
    display: none;
}

/* Hide category badge on back of flash card */
.flip-card-back .category-badge {
    display: none;
}

/* Premium Hover Effect */
.flip-card:hover .flip-card-front,
.flip-card:hover .flip-card-back {
    box-shadow: var(--shadow-lg);
}

/* Remove the translateY on hover to prevent jumping */
.flip-card:active {
    transform: scale(0.98);
}

/* Responsive FlashCards */
@media (max-width: 1024px) {
    .flashcard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .flashcard-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .flip-card-inner {
        min-height: 240px;
    }

    .flip-card-front,
    .flip-card-back {
        padding: var(--space-lg);
    }

    .flip-card-front h3,
    .flip-card-back h3 {
        font-size: 0.8125rem;
    }

    .flip-card-front p,
    .flip-card-back p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .flashcard-grid {
        gap: var(--space-md);
    }

    .flip-card-inner {
        min-height: 220px;
    }

    .flip-card-front,
    .flip-card-back {
        padding: var(--space-md);
    }

    .flip-hint {
        bottom: var(--space-sm);
    }
}