/* Flashcards - Study mode with card flipping */

.flashcards-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    min-height: calc(100vh - var(--navbar-height));
    display: flex;
    flex-direction: column;
}

.flashcards-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.flashcards-progress {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    font-weight: 500;
}

/* ── Flashcard progress bar ──────────────────────────────────────────────── */
.fc-progress-bar-wrapper {
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    margin-bottom: 4px;
    overflow: hidden;
}

.fc-progress-bar-fill {
    height: 100%;
    background: #4CAF50;
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

/* ── Self-assessment buttons ─────────────────────────────────────────────── */

.fc-got-it-btn {
    background: rgba(76, 175, 80, 0.15);
    border: 1px solid #4CAF50;
    color: #4CAF50;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}
.fc-got-it-btn:hover {
    background: rgba(76, 175, 80, 0.3);
}

.fc-need-practice-btn {
    background: rgba(244, 67, 54, 0.15);
    border: 1px solid #f44336;
    color: #f44336;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--border-radius);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}
.fc-need-practice-btn:hover {
    background: rgba(244, 67, 54, 0.3);
}

.flashcard {
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1000px;
    margin: var(--spacing-sm) 0 var(--spacing-sm);
    cursor: pointer;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 400px;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    border-radius: var(--border-radius);
}

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

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    box-sizing: border-box;
}

.flashcard-front {
    background: var(--color-primary);
    color: var(--color-secondary);
}

.flashcard-back {
    background: var(--color-active);
    color: var(--color-secondary);
    transform: rotateY(180deg);
}

.flashcard-question,
.flashcard-answer {
    font-size: var(--font-size-xl);
    font-weight: 500;
    line-height: 1.4;
    text-align: center;
    word-wrap: break-word;
}

.flashcard-answer {
    color: #4CAF50;
}

.flashcards-navigation {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xs);
    flex-wrap: wrap;
}

.flashcards-navigation .btn {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-md);
    white-space: nowrap;
}

.flashcards-navigation .fc-nav-prev,
.flashcards-navigation .fc-nav-next {
    min-width: 130px;
}

.flashcards-navigation .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ── Star on the flashcard front face ──────────────────────────────── */
.fc-card-star {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-size: 22px;
    line-height: 1;
    z-index: 2;
}

/* ── Show Hint / Show Image row below the flashcard ────────────────── */
.fc-secondary-row {
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

/* Responsive design */
@media (max-width: 768px) {
    .flashcards-container {
        padding: var(--spacing-lg);
    }
    
    .flashcard-inner {
        height: 300px;
    }
    
    .flashcard-question,
    .flashcard-answer {
        font-size: var(--font-size-lg);
    }
}

/* Criteria list displayed on back of card for Long Answer / Draw types */
.flashcard-answer.flashcard-criteria-list {
    font-size: var(--font-size-md);
    text-align: left;
    line-height: 1.8;
    color: var(--color-secondary);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
    overflow-y: auto;
}

/* Reference image on back of Draw flashcard */
.flashcard-draw-ref-img {
    max-width: 100%;
    max-height: 200px;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    object-fit: contain;
    align-self: center;
}

.flashcard-criteria-text {
    font-size: var(--font-size-sm);
    line-height: 1.7;
    color: var(--color-secondary);
}

/* Highlight-fill: blank placeholders on the front face */
.fc-blank {
    display: inline-block;
    border-bottom: 2px solid var(--color-accent, #4CAF50);
    min-width: 60px;
    color: transparent;
    background: rgba(76, 175, 80, 0.1);
    border-radius: 2px;
    padding: 0 4px;
}

/* Highlight-fill: filled-in answers on the back face */
.fc-blank-answer {
    color: #4CAF50;
    font-weight: 600;
    border-bottom: 2px solid #4CAF50;
    padding: 0 2px;
}

/* Matching pairs on back face */
.fc-match-term {
    color: var(--color-secondary);
    font-weight: 500;
}

.fc-match-arrow {
    color: var(--color-text-muted, #aaa);
    margin: 0 4px;
}

.fc-match-answer {
    color: #4CAF50;
    font-weight: 500;
}

/* Reorder numbered items */
.fc-reorder-num {
    color: var(--color-text-muted, #aaa);
    font-weight: 600;
    margin-right: 4px;
}

/* Chart flashcard face — allows column layout and scroll */
.flashcard-front.fc-chart-face,
.flashcard-back.fc-chart-face {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    overflow-y: auto;
    padding: var(--spacing-md);
    gap: var(--spacing-sm);
}

.fc-question-with-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    width: 100%;
    text-align: left;
    font-size: inherit;
    font-weight: inherit;
}

.fc-chart-question-text {
    font-size: var(--font-size-md);
    font-weight: 500;
    color: var(--color-secondary);
    margin: 0;
    text-align: center;
}

/* Chart table inside flashcard */
.fc-chart-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.fc-chart-td {
    border: 1px solid var(--color-border);
    padding: 6px 10px;
    text-align: center;
    color: var(--color-secondary);
    min-width: 48px;
}

.fc-chart-td--blank {
    background: rgba(255, 255, 255, 0.04);
    border-style: dashed;
    color: transparent;
    min-width: 60px;
}

.fc-chart-td--revealed {
    background: rgba(76, 175, 80, 0.12);
    border-color: #4CAF50;
    color: #4CAF50;
    font-weight: 600;
}