/* Study Mode Styles */

/* Section label inside the MCQ question number heading */
.question-section-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 2px;
}
.study-mode-container {
    animation: fadeIn var(--transition-speed);
    display: flex;
    flex-direction: column;
    height: calc(100vh - var(--navbar-height));
    overflow: hidden;
}

.study-main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* Sidebar Styles */
.study-sidebar {
    width: 260px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    overflow-y: auto;
    padding: var(--spacing-md);
}

.study-sidebar-left {
    border-right: 1px solid var(--color-border);
}

.study-sidebar-right {
    border-left: 1px solid var(--color-border);
}

/* Center column */
.study-center-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: var(--spacing-lg);
    min-width: 0;
}

.sidebar-timer-section {
    /* Container for timer */
}

.sidebar-timer-container {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: center;
}

.sidebar-timer-title {
    color: var(--text-color);
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: 0;
}

.sidebar-timer-label {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.sidebar-countdown-timer {
    color: var(--text-color);
    font-size: var(--font-size-xxl);
    font-weight: bold;
    font-family: monospace;
    letter-spacing: 2px;
    transition: all 0.3s ease;
}

.sidebar-countdown-timer.timer-critical {
    color: #f44336;
    animation: pulse-critical 0.5s infinite;
}

.sidebar-countdown-timer.timer-paused {
    color: #ff9800;
    animation: pulse-paused 1s infinite;
}

.sidebar-countdown-timer.timer-unlimited {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    letter-spacing: 0;
}

.sidebar-timer-container:has(.timer-critical) {
    border-color: #f44336;
    background: rgba(244, 67, 54, 0.1);
}

.sidebar-timer-container:has(.timer-paused) {
    border-color: #ff9800;
    background: rgba(255, 152, 0, 0.1);
}

/* Hint Sidebar Styles */
.sidebar-hint-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-hint-container {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.sidebar-hint-title {
    color: var(--text-color);
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: 0;
    text-align: center;
}

.sidebar-hint-container .hint-display {
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
}

.sidebar-hint-container .hint-text {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    margin: 0;
}

.hint-placeholder {
    color: rgba(255, 255, 255, 0.35);
    font-size: var(--font-size-sm);
    font-style: italic;
    text-align: center;
    margin: 0;
}

.justification-answer-label {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: #999;
    margin: var(--spacing-sm) 0 2px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.justification-answer-body {
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    line-height: 1.5;
    margin: 0 0 var(--spacing-xs);
}

/* Header */
.study-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.study-title {
    color: var(--color-secondary);
    font-size: var(--font-size-xl);
    margin: 0;
    flex: 1;
    text-align: center;
}

.study-info {
    color: #999;
    font-size: var(--font-size-sm);
    text-align: center;
    flex-basis: 100%;
}

/* Progress Bar */
.progress-container {
    margin-bottom: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.progress-meta-row {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.progress-meta-left {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.progress-meta-right {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

.progress-bar-wrapper {
    position: relative;
    height: 8px;
}

.progress-bar-wrapper--total {
    margin-top: var(--spacing-sm);
}

.progress-bar {
    position: absolute;
    inset: 0;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

.progress-bar--total {
    background: rgba(255, 255, 255, 0.06);
}

.progress-fill {
    height: 100%;
    border-radius: 10px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-fill--round {
    background: linear-gradient(90deg, #4CAF50, #45a049);
}

.progress-fill--total {
    background: rgba(255, 255, 255, 0.25);
}

/* Current Progress Display */
.current-progress-display {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.current-progress-title {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    margin: 0 0 var(--spacing-sm) 0;
    text-align: center;
    font-weight: 600;
}

.current-progress-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--spacing-sm);
}

.progress-stat {
    text-align: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.progress-stat .stat-label {
    display: block;
    color: #999;
    font-size: var(--font-size-xs);
    margin-bottom: 2px;
}

.progress-stat .stat-value {
    display: block;
    font-size: var(--font-size-md);
    font-weight: 600;
}

.progress-stat .stat-value.correct {
    color: #4CAF50;
}

.progress-stat .stat-value.incorrect {
    color: #ff4444;
}

.progress-stat .stat-value.accuracy {
    color: #ffd700;
}

/* Question Container */
.question-container {
    flex: 1;
    max-width: 500px;
    margin: 0 auto;
}

/* Question Card */
.question-card {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.question-header-study {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Highlight-fill (fill-in-the-blank) question */
.highlight-fill-question-display {
    font-size: var(--font-size-lg);
    line-height: 2.2;
    color: var(--color-secondary);
    text-align: left;
}

.fill-text-segment {
    white-space: pre-wrap;
}

.fill-blank-input {
    display: inline-block;
    width: 120px;
    background: rgba(255, 255, 255, 0.07);
    border: none;
    border-bottom: 2px solid var(--color-border);
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    font-family: inherit;
    padding: 2px 6px;
    margin: 0 4px;
    border-radius: 0;
    outline: none;
    vertical-align: middle;
    transition: border-color 0.2s;
}

.fill-blank-input:focus {
    border-bottom-color: #2196F3;
}

.fill-blank-input.fill-blank-correct {
    border-bottom-color: #4CAF50;
    color: #4CAF50;
}

.fill-blank-input.fill-blank-incorrect {
    border-bottom-color: #ff4444;
    color: #ff4444;
}

.fill-blank-correction {
    color: #4CAF50;
    font-size: var(--font-size-sm);
    font-style: italic;
    margin-left: 2px;
}

.question-number-study {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 600;
}

.question-text-study {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    line-height: 1.6;
    margin: 0;
    font-weight: 500;
}

.timer-display {
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid #ffd700;
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    color: #ffd700;
    font-size: var(--font-size-sm);
    font-weight: 600;
}

/* Countdown Timer Styles */
.countdown-timer-container {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.countdown-timer-container .timer-label {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    display: block;
}

.countdown-timer {
    color: var(--text-color);
    font-size: var(--font-size-xl);
    font-weight: bold;
    font-family: monospace;
    letter-spacing: 2px;
    transition: all 0.3s ease;
}

.countdown-timer.timer-warning {
    color: #ff9800;
    animation: pulse-warning 1s infinite;
}

.countdown-timer.timer-critical {
    color: #f44336;
    animation: pulse-critical 0.5s infinite;
}

.countdown-timer-container:has(.timer-warning) {
    border-color: #ff9800;
    background: rgba(255, 152, 0, 0.1);
}

.countdown-timer-container:has(.timer-critical) {
    border-color: #f44336;
    background: rgba(244, 67, 54, 0.1);
}

@keyframes pulse-warning {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes pulse-critical {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

@keyframes pulse-paused {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Exit Confirmation Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease-out;
}

.modal-content {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    max-width: 400px;
    width: 90%;
    text-align: center;
    animation: slideIn 0.2s ease-out;
}

.exit-modal {
    border-color: #f44336;
    box-shadow: 0 8px 32px rgba(244, 67, 54, 0.2);
}

.modal-title {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
}

.modal-message {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    line-height: 1.5;
    margin: 0 0 var(--spacing-xl) 0;
}

.modal-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.modal-buttons .btn {
    min-width: 100px;
    padding: var(--spacing-sm) var(--spacing-lg);
}

@keyframes slideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Answer Options */
.answers-container {
    margin-bottom: var(--spacing-xl);
}

.answer-option {
    margin-bottom: var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
}

.answer-input-study {
    display: none;
}

.answer-label-study {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.02);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all var(--transition-speed);
    gap: var(--spacing-md);
}

.answer-label-study:hover {
    border-color: var(--color-secondary);
    background: rgba(255, 255, 255, 0.05);
}

.answer-input-study:checked + .answer-label-study {
    border-color: var(--color-secondary);
    background: rgba(255, 255, 255, 0.1);
}

.answer-letter {
    background: var(--color-secondary);
    color: var(--color-primary);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: var(--font-size-md);
    flex-shrink: 0;
}

.answer-input-study:checked + .answer-label-study .answer-letter {
    background: var(--color-secondary);
    color: var(--color-primary);
}

.answer-text-study {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    line-height: 1.5;
    flex: 1;
}

/* Answer Feedback */
.answer-option.correct-answer .answer-label-study {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.2);
}

.answer-option.correct-answer .answer-letter {
    background: #4CAF50;
    color: white;
}

.answer-option.incorrect-answer .answer-label-study {
    border-color: #ff4444;
    background: rgba(255, 68, 68, 0.2);
}

.answer-option.incorrect-answer .answer-letter {
    background: #ff4444;
    color: white;
}

.feedback-container {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
}

/* Stat-flash animations for correct / incorrect results */
@keyframes flashCorrect {
    0%   { background: transparent; }
    30%  { background: rgba(76, 175, 80, 0.35); box-shadow: 0 0 8px rgba(76, 175, 80, 0.6); }
    100% { background: transparent; box-shadow: none; }
}

@keyframes flashIncorrect {
    0%   { background: transparent; }
    30%  { background: rgba(255, 68, 68, 0.35); box-shadow: 0 0 8px rgba(255, 68, 68, 0.6); }
    100% { background: transparent; box-shadow: none; }
}

.stat-flash-correct {
    animation: flashCorrect 0.8s ease-out forwards;
    border-radius: var(--border-radius);
}

.stat-flash-incorrect {
    animation: flashIncorrect 0.8s ease-out forwards;
    border-radius: var(--border-radius);
}

@keyframes flashStreak {
    0%   { background: transparent; }
    30%  { background: rgba(255, 193, 7, 0.35); box-shadow: 0 0 8px rgba(255, 193, 7, 0.7); }
    100% { background: transparent; box-shadow: none; }
}

.stat-flash-streak {
    animation: flashStreak 0.9s ease-out forwards;
    border-radius: var(--border-radius);
}

/* Streak stat box */
.streak-stat {
    display: flex;
    align-items: center;
    justify-content: space-around;
    gap: var(--spacing-xs);
    grid-column: 1 / -1;
}

.streak-half {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
}

.streak-divider {
    color: var(--color-border);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.stat-value.streak {
    color: #ffc107;
}

.stat-value.streak-best {
    color: #ffab00;
}

/* Auto-advance message */
.auto-advance-message {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    text-align: center;
    font-style: italic;
    opacity: 0.8;
    padding: var(--spacing-sm);
}

/* Auto-submit helper text - lives in left sidebar below Current Session Progress */
.auto-submit-helper {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    margin-top: var(--spacing-md);
}

.answer-justification {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    line-height: 1.6;
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border-left: 4px solid #4CAF50;
}


/* Question Buttons */
.question-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.question-buttons .btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-md);
    font-weight: 600;
}

/* MCQ column layout: submit full-width on top, secondary row below */
.question-buttons--mcq {
    flex-direction: column;
}

.question-buttons--mcq .submit-answer {
    width: 100%;
    flex: none;
}

/* Secondary row: Show Image (left) + Show Hint (right) at equal width */
.question-buttons-secondary {
    display: flex;
    gap: var(--spacing-md);
    width: 100%;
}

.question-buttons-secondary .btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-md);
    font-weight: 600;
}

.question-buttons-secondary .btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

.hint-button {
    background: rgba(255, 215, 0, 0.1);
    border: 1px solid #ffd700;
    color: #ffd700;
}

.hint-button:not(:disabled):hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: #ffed4e;
    color: #ffed4e;
}

.show-image-button {
    background: rgba(99, 179, 237, 0.1);
    border: 1px solid #63b3ed;
    color: #63b3ed;
}

.show-image-button:not(:disabled):hover {
    background: rgba(99, 179, 237, 0.2);
    border-color: #90cdf4;
    color: #90cdf4;
}

/* Question image modal */
.question-image-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.88);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    cursor: zoom-out;
}

.question-image-modal img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.7);
    object-fit: contain;
}

.btn-override {
    background: rgba(255, 165, 0, 0.1);
    border: 1px solid #ffa500;
    color: #ffa500;
}

.btn-override:hover {
    background: rgba(255, 165, 0, 0.2);
    border-color: #ffb733;
    color: #ffb733;
}

/* Review Screen */
.review-card {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.review-title {
    color: var(--color-secondary);
    font-size: var(--font-size-xl);
    margin: 0 0 var(--spacing-lg) 0;
}

.review-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.review-button-row {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.redo-batch-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.redo-batch-btn {
    white-space: nowrap;
}

.redo-recommended-text {
    color: #ff4444;
    font-style: italic;
    font-size: var(--font-size-xs);
    margin: 0;
}

.review-continue-btn {
}

.stat-item {
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    color: var(--color-secondary);
    font-size: var(--font-size-md);
}

.stat-item .correct {
    color: #4CAF50;
    font-weight: 600;
}

.stat-item .incorrect {
    color: #ff4444;
    font-weight: 600;
}

.stat-item .accuracy {
    color: #ffd700;
    font-weight: 600;
}

/* Recent Questions Review */
.recent-questions-title {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    font-weight: 600;
    margin: 0 0 var(--spacing-md) 0;
    text-align: left;
}

.review-recent-questions-sidebar {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

.recent-questions-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    overflow-y: auto;
    flex: 1;
}

.question-review-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    text-align: left;
}

.question-review-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.question-review-number {
    background: var(--color-border);
    color: var(--color-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 600;
    min-width: 40px;
    text-align: center;
}

.question-review-star {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.question-review-star:hover {
    transform: scale(1.2);
}

.question-review-star.highlighted {
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.result-icon {
    font-size: var(--font-size-md);
    font-weight: bold;
    margin-left: auto;
}

.result-icon.correct {
    color: #4CAF50;
}

.result-icon.incorrect {
    color: #f44336;
}

.question-review-text {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.4;
}

.review-answers-label {
    font-size: var(--font-size-xs);
    color: #999;
    margin-top: var(--spacing-sm);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.question-review-answers {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.review-answer-row {
    font-size: var(--font-size-sm);
    padding: 4px var(--spacing-sm);
    border-radius: var(--border-radius);
    line-height: 1.4;
}

.review-answer-correct {
    background: rgba(76, 175, 80, 0.12);
    border: 1px solid rgba(76, 175, 80, 0.35);
    color: #81c784;
}

/* Final Results */
.results-card {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
}

.results-title {
    color: var(--color-secondary);
    font-size: var(--font-size-xl);
    margin: 0 0 var(--spacing-lg) 0;
}

.final-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.final-stat-item {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    color: var(--color-secondary);
    font-size: var(--font-size-md);
}

.final-stat-item .correct {
    color: #4CAF50;
    font-weight: 600;
}

.final-stat-item .incorrect {
    color: #ff4444;
    font-weight: 600;
}

.final-stat-item .accuracy {
    color: #ffd700;
    font-weight: 600;
}

.results-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.results-buttons .btn {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-md);
    font-weight: 600;
    min-width: 150px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .study-mode-container {
        height: auto;
        overflow: visible;
    }

    .study-main-content {
        flex-direction: column;
        overflow: visible;
    }

    .study-sidebar {
        width: 100%;
        overflow-y: visible;
        border-right: none;
        border-left: none;
    }

    .study-center-column {
        overflow-y: visible;
        padding: var(--spacing-md);
        order: 1;
    }

    .study-sidebar-left {
        order: 2;
    }

    .study-sidebar-right {
        order: 3;
    }

    .question-container {
        max-width: 100%;
    }
    
    .study-header {
        flex-direction: column;
        text-align: center;
    }
    
    .question-card {
        padding: var(--spacing-lg);
    }
    
    .sidebar-countdown-timer {
        font-size: var(--font-size-xl);
    }
    
    .sidebar-timer-container {
        padding: var(--spacing-sm);
    }
    
    .answer-label-study {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .answer-letter {
        width: 28px;
        height: 28px;
        font-size: var(--font-size-sm);
    }
    
    .review-stats,
    .final-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .results-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .results-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .question-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .question-buttons .btn {
        width: 100%;
    }

    .question-buttons-secondary {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .question-buttons-secondary .btn {
        width: 100%;
    }
}

/* ── Matching question study mode ──────────────────────────────────── */
.matching-study-headers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-xs);
}

.matching-study-col-hdr {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: #999;
    text-align: center;
}

.matching-ref-title {
    font-size: var(--font-size-sm);
    color: #999;
    margin: var(--spacing-sm) 0 var(--spacing-xs);
    font-style: italic;
}

.matching-ref-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: var(--spacing-md);
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
}

.matching-ref-item {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    font-size: var(--font-size-sm);
}

.matching-ref-num {
    font-weight: 700;
    color: #999;
    min-width: 20px;
    text-align: right;
}

.matching-ref-text {
    color: var(--color-secondary);
}

/* ── Categorize question (study + test mode) ─────────────────────────── */
.categorize-ref-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
}

.categorize-ref-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.categorize-ref-num {
    font-weight: 700;
    color: var(--color-secondary);
    min-width: 20px;
}

.categorize-ref-label {
    color: var(--color-text, #e2e8f0);
}

.categorize-select {
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    padding: 6px var(--spacing-sm);
    width: 100%;
    cursor: pointer;
    transition: border-color var(--transition-speed);
}

.categorize-select:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.matching-term-rows {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.matching-term-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    align-items: center;
    padding: var(--spacing-sm);
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    transition: border-color var(--transition-speed);
}

.matching-term-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
}

.matching-term-text {
    color: var(--color-secondary);
}

.matching-select {
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    padding: 6px var(--spacing-sm);
    width: 100%;
    cursor: pointer;
    transition: border-color var(--transition-speed);
}

.matching-select:focus {
    outline: none;
    border-color: var(--color-secondary);
}

/* Custom wrapping dropdown */
.matching-dropdown {
    position: relative;
    width: 100%;
}

.matching-dropdown-trigger {
    width: 100%;
    text-align: left;
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: rgba(255, 255, 255, 0.45);
    font-size: var(--font-size-sm);
    padding: 8px var(--spacing-sm);
    cursor: pointer;
    transition: border-color var(--transition-speed);
    white-space: normal;
    word-break: break-word;
    line-height: 1.4;
}

.matching-dropdown-trigger--selected {
    color: var(--color-secondary);
}

.matching-dropdown-trigger:hover,
.matching-dropdown-trigger:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.matching-dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    z-index: 100;
    background: #1e1e1e;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    max-height: 240px;
    overflow-y: auto;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

/* Portal version — appended to body, positioned via JS */
.matching-dropdown-menu--portal {
    position: fixed;
    z-index: 9999;
    background: #1e1e1e;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    max-height: 240px;
    overflow-y: auto;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
}

.matching-dropdown-option {
    padding: 10px var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
    cursor: pointer;
    white-space: normal;
    word-break: break-word;
    line-height: 1.5;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    transition: background 0.12s;
}

.matching-dropdown-option:last-child {
    border-bottom: none;
}

.matching-dropdown-option:hover {
    background: rgba(255, 255, 255, 0.08);
}

.matching-dropdown-option--active {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.matching-term-row.matching-correct {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.1);
}

.matching-term-row.matching-incorrect {
    border-color: #f44336;
    background: rgba(244, 67, 54, 0.1);
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
}

.matching-correction {
    grid-column: 1 / -1;
    color: #4CAF50;
    font-size: var(--font-size-sm);
    font-style: italic;
    margin-top: var(--spacing-xs);
}

.matching-result-icon {
    font-size: var(--font-size-md);
    font-weight: 700;
    padding-left: var(--spacing-xs);
}

.matching-term-row.matching-correct .matching-result-icon { color: #4CAF50; }
.matching-term-row.matching-incorrect .matching-result-icon { color: #f44336; }

/* ── Reorder study rows ──────────────────────────────────────────────────── */
.reorder-study-item-label {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.4;
    padding: var(--spacing-xs) 0;
}
/* ── Reverse (answer-prompt) mode ────────────────────────────────────────── */
.reverse-prompt-label {
    font-size: var(--font-size-sm);
    color: #888;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0 0 var(--spacing-sm) 0;
}

.reverse-prompt-text {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md) var(--spacing-lg);
    font-style: italic;
    color: var(--color-secondary);
}

/* ── Attempts sidebar display ────────────────────────────────────────── */
.attempts-sidebar-display {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 6px var(--spacing-sm);
    text-align: center;
}

.attempts-sidebar-display .current-progress-title {
    margin-bottom: 2px;
}

.attempts-sidebar-body {
    font-size: var(--font-size-sm);
    margin-top: 0;
    line-height: 1.2;
}

.att-remaining {
    font-size: var(--font-size-md);
    font-weight: 700;
    color: #4CAF50;
}

.att-low {
    color: #ff9800 !important;
}

.att-none {
    color: #f44336 !important;
}

.att-of {
    color: #999;
    font-size: var(--font-size-sm);
    margin-left: 2px;
}

/* ── Break modal ─────────────────────────────────────────────────────── */
.break-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.break-modal {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl);
    text-align: center;
    max-width: 380px;
    width: 90%;
    animation: slideIn 0.2s ease-out;
}

.break-modal-title {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    margin: 0 0 var(--spacing-md);
}

.break-timer-label {
    color: #999;
    font-size: var(--font-size-sm);
    margin: 0 0 var(--spacing-sm);
}

.break-timer-input {
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    width: 100px;
    margin-bottom: var(--spacing-lg);
}

.break-continue-btn {
    width: 100%;
}

/* ── Back button in left sidebar ─────────────────────────────────────── */
.btn-back-sidebar {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    cursor: pointer;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    width: 100%;
    text-align: left;
    transition: all var(--transition-speed);
}

.btn-back-sidebar:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-secondary);
}

/* ── Pause button in sidebars / test header ──────────────────────────── */
.btn-pause-sidebar {
    background: rgba(255, 200, 60, 0.1);
    border: 1px solid rgba(255, 200, 60, 0.35);
    border-radius: var(--border-radius);
    color: #f0c040;
    cursor: pointer;
    font-size: var(--font-size-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    width: 100%;
    text-align: left;
    transition: all var(--transition-speed);
    margin-top: var(--spacing-xs);
}

.btn-pause-sidebar:hover {
    background: rgba(255, 200, 60, 0.2);
    border-color: #f0c040;
}

.btn-test-pause {
    width: auto;
    margin-left: auto;
    margin-top: 0;
}

/* ── Pause modal ─────────────────────────────────────────────────────── */
.pause-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 3000;
}

.pause-modal {
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl) var(--spacing-xxl, 2.5rem);
    text-align: center;
    max-width: 320px;
    width: 90%;
    animation: slideIn 0.2s ease-out;
}

.pause-modal-icon {
    font-size: 2.4rem;
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.pause-modal-title {
    color: var(--color-secondary);
    font-size: var(--font-size-lg);
    margin: 0 0 var(--spacing-sm);
}

.pause-modal-timer {
    color: #f0c040;
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.02em;
}

.pause-modal-resume-btn {
    width: 100%;
}

/* ── Disabled submit button ──────────────────────────────────────────── */
.submit-answer:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ── Exit modal narrow ───────────────────────────────────────────────── */
.exit-modal {
    max-width: 280px !important;
    width: 50% !important;
    padding: var(--spacing-md) !important;
}

/* ── Self-grade buttons row (Got it! / Needs Review) ─────────────────── */
.self-grade-btn-row {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

.post-answer-btn-row {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-start;
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

.btn-override-correct {
    background: transparent;
    border: 1px solid #ca8a04;
    color: #fbbf24;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: background 0.15s;
}

.btn-override-correct:hover {
    background: rgba(251, 191, 36, 0.12);
}

/* ── Long Answer question type ───────────────────────────────────────── */
.long-answer-wrapper {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin: var(--spacing-md) 0;
}

.long-answer-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted, #aaa);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.long-answer-textarea {
    width: 100%;
    min-height: 160px;
    padding: var(--spacing-md);
    background: var(--color-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    font-family: inherit;
    line-height: 1.6;
    resize: vertical;
    box-sizing: border-box;
    transition: border-color 0.2s ease;
}

.long-answer-textarea:focus {
    outline: none;
    border-color: var(--color-accent, #4CAF50);
}

.long-answer-submitted-box {
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.long-answer-submitted-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted, #aaa);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0 0 var(--spacing-xs);
}

.long-answer-submitted-text {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    line-height: 1.6;
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
}

/* ── Draw question type ──────────────────────────────────────────────── */
.draw-prompt {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin: var(--spacing-md) 0;
    text-align: center;
    background: rgba(255, 255, 255, 0.03);
}

.draw-prompt-icon {
    font-size: 2.5rem;
    line-height: 1;
}

.draw-prompt-text {
    color: var(--color-text-muted, #aaa);
    font-size: var(--font-size-md);
    margin: 0;
}

.draw-answer-image-section {
    margin: var(--spacing-md) 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.draw-answer-image-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted, #aaa);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0;
}

.draw-answer-image {
    max-width: 100%;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    display: block;
}

.draw-no-image {
    font-style: italic;
}

/* ── Criteria checklist (Long Answer + Draw) ─────────────────────────── */
.criteria-section {
    background: var(--color-active);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.criteria-section-title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-muted, #aaa);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0 0 var(--spacing-xs);
}

.criteria-note {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    margin: 0 0 var(--spacing-sm);
    opacity: 0.8;
}

.criteria-check-row {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.criteria-check-row:last-child {
    border-bottom: none;
}

.criteria-checkbox {
    margin-top: 3px;
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: #4CAF50;
}

.criteria-check-label {
    color: var(--color-secondary);
    font-size: var(--font-size-md);
    line-height: 1.5;
    cursor: pointer;
}

.criteria-check-row:has(.criteria-checkbox:checked) .criteria-check-label {
    color: #4CAF50;
    text-decoration: line-through;
    opacity: 0.8;
}

.question-buttons--long-answer,
.question-buttons--draw {
    margin-top: var(--spacing-sm);
}