/* Flashcard Article Styles */

/* Flashcard Counter */
.flashcard-counter {
    text-align: center;
    margin-bottom: 2rem;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.current-card {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.counter-divider {
    margin: 0 0.5rem;
    color: var(--text-muted);
}

.total-cards {
    font-weight: 600;
}

/* Article Intro */
.article-intro {
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* Flashcard Wrapper */
.flashcard-wrapper {
    position: relative;
    min-height: 600px;
    perspective: 1200px;
    padding-bottom: 4rem;
}

.flashcard {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 900px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform, opacity;
}

/* Active card - fully visible */
.flashcard.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0) scale(1);
    pointer-events: auto;
    z-index: 10;
    position: relative;
}

/* Next card - slightly behind and below */
.flashcard.next-card {
    opacity: 0.7;
    visibility: visible;
    transform: translateX(-50%) translateY(30px) scale(0.95);
    z-index: 9;
    position: absolute;
}

/* Second next card - even further behind */
.flashcard.next-card-2 {
    opacity: 0.4;
    visibility: visible;
    transform: translateX(-50%) translateY(60px) scale(0.9);
    z-index: 8;
    position: absolute;
}

/* Previous cards - hidden */
.flashcard.prev-card {
    opacity: 0;
    visibility: hidden;
    transform: translateX(-150%) scale(0.9);
    z-index: 1;
}

.flashcard-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 3rem;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
    cursor: grab;
    touch-action: pan-y pinch-zoom;
    user-select: none;
    -webkit-user-select: none;
}

.flashcard-content:active {
    cursor: grabbing;
}

.flashcard-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--gradient-primary);
}

/* Add filter blur to background cards */
.flashcard.next-card .flashcard-content,
.flashcard.next-card-2 .flashcard-content {
    filter: brightness(0.95);
}

.flashcard-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-md);
}

.flashcard-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    line-height: 1.3;
}

.flashcard-images {
    margin: 2rem 0;
    border-radius: 16px;
    overflow: hidden;
    display: grid;
    gap: 1rem;
}

.flashcard-images img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.flashcard-images.two-images {
    grid-template-columns: repeat(2, 1fr);
}

.flashcard-images.three-images {
    grid-template-columns: repeat(3, 1fr);
}

.flashcard-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.9;
}

/* Swipe Instructions */
.swipe-instruction {
    text-align: center;
    margin-top: 3rem;
    color: var(--text-muted);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.swipe-instruction.show {
    opacity: 1;
    animation: pulse 2s ease-in-out infinite;
}

.swipe-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    animation: swipeHint 2s ease-in-out infinite;
}

@keyframes swipeHint {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-20px); }
    75% { transform: translateX(20px); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* No Flashcards Message */
.no-flashcards {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem;
    background: var(--bg-tertiary);
    border-radius: 20px;
    text-align: center;
}

.no-flashcards p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .flashcard-content {
        padding: 2rem 1.5rem;
    }

    .flashcard-title {
        font-size: 1.5rem;
    }

    .flashcard-description {
        font-size: 1rem;
    }

    .flashcard-images.two-images,
    .flashcard-images.three-images {
        grid-template-columns: 1fr;
    }

    .swipe-instruction {
        margin-top: 2rem;
        font-size: 0.9rem;
    }

    .swipe-icon {
        font-size: 2.5rem;
    }

    .flashcard-counter {
        font-size: 1.25rem;
        margin-bottom: 2.5rem;
    }

    .current-card {
        font-size: 2rem;
    }
}