/**
 * QuizEdu Flashcard Addon — Study Player styles.
 *
 * Uses the core's CSS custom properties (--skin-color, etc.)
 * for consistent theming.
 */

/* ==================================================================
 * Study page layout
 * ================================================================*/

.quizedu-fc-study-page {
    max-width: 780px;
    margin: 0 auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

/* Header */
.quizedu-fc-study-header {
    margin-bottom: 24px;
}

.quizedu-fc-study-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 8px;
}

.quizedu-fc-study-title-row h2 {
    margin: 0;
    font-size: 24px;
    font-weight: 700;
    color: #111827;
}

.quizedu-fc-back-link {
    font-size: 14px;
    color: var(--skin-color, #0F5BFF);
    text-decoration: none;
}
.quizedu-fc-back-link:hover {
    text-decoration: underline;
}

.quizedu-fc-study-description {
    color: #6B7280;
    font-size: 14px;
    margin-bottom: 8px;
}

.quizedu-fc-deck-meta {
    display: flex;
    gap: 10px;
    align-items: center;
    font-size: 13px;
    color: #6B7280;
}

/* ==================================================================
 * Stats bar
 * ================================================================*/

.quizedu-fc-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.quizedu-fc-stat-card {
    text-align: center;
    padding: 14px 8px;
    border-radius: 10px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
}

.quizedu-fc-stat-number {
    display: block;
    font-size: 22px;
    font-weight: 700;
    color: #111827;
}

.quizedu-fc-stat-label {
    display: block;
    font-size: 12px;
    color: #6B7280;
    margin-top: 2px;
}

.quizedu-fc-stat-card-new .quizedu-fc-stat-number { color: #6366f1; }
.quizedu-fc-stat-card-learning .quizedu-fc-stat-number { color: #f59e0b; }
.quizedu-fc-stat-card-mastered .quizedu-fc-stat-number { color: #10b981; }

/* ==================================================================
 * Mode selector
 * ================================================================*/

.quizedu-fc-mode-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.quizedu-fc-mode-btn {
    padding: 8px 18px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    background: #fff;
    font-size: 13px;
    font-weight: 600;
    color: #374151 !important;
    cursor: pointer;
    transition: all 0.2s;
}
.quizedu-fc-mode-btn:hover {
    border-color: var(--skin-color, #0F5BFF);
    color: var(--skin-color, #0F5BFF);
}
.quizedu-fc-mode-btn.active {
    background: var(--skin-color, #0F5BFF);
    border-color: var(--skin-color, #0F5BFF);
    color: #fff !important;
}

.quizedu-fc-reset-btn {
    margin-left: auto;
    padding: 8px 18px;
    border: 2px solid #fca5a5;
    border-radius: 8px;
    background: #fff;
    font-size: 13px;
    font-weight: 600;
    color: #ef4444 !important;
    cursor: pointer;
    transition: all 0.2s;
}
.quizedu-fc-reset-btn:hover {
    background: #fef2f2 !important;
}

/* ==================================================================
 * Progress bar (segmented)
 * ================================================================*/

.quizedu-fc-progress-bar {
    display: flex;
    gap: 3px;
    margin-bottom: 24px;
    min-height: 6px;
}

.quizedu-fc-progress-segment {
    height: 6px;
    flex: 1;
    border-radius: 3px;
    background: #e5e7eb;
    transition: background 0.3s;
}

.quizedu-fc-progress-segment.current  { background: var(--skin-color, #0F5BFF); }
.quizedu-fc-progress-segment.correct  { background: #10b981; }
.quizedu-fc-progress-segment.incorrect { background: #ef4444; }

/* ==================================================================
 * Counter
 * ================================================================*/

.quizedu-fc-counter {
    text-align: center;
    font-size: 14px;
    color: #6B7280;
    margin-bottom: 16px;
    font-weight: 600;
}

/* ==================================================================
 * Flip card
 * ================================================================*/

.quizedu-fc-card-container {
    perspective: 1000px;
    width: 100%;
    max-width: 620px;
    height: 380px;
    margin: 0 auto 24px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.quizedu-fc-card {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.quizedu-fc-card.flipped {
    transform: rotateY(180deg);
}

.quizedu-fc-card-front,
.quizedu-fc-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 32px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    overflow-y: auto;
    text-align: center;
}

.quizedu-fc-card-front {
    background: #fff;
    border: 2px solid var(--skin-color, #0F5BFF);
}

.quizedu-fc-card-back {
    background: var(--skin-color, #0F5BFF);
    color: #fff;
    transform: rotateY(180deg);
}

.quizedu-fc-card-side-label {
    position: absolute;
    top: 16px;
    left: 24px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    opacity: 0.5;
}

.quizedu-fc-card-text {
    font-size: 18px;
    line-height: 1.6;
    font-weight: 500;
    max-width: 100%;
    word-break: break-word;
}

.quizedu-fc-card-front .quizedu-fc-card-text {
    color: #111827;
}

.quizedu-fc-card-category {
    position: absolute;
    bottom: 16px;
    right: 24px;
    font-size: 12px;
    color: #9ca3af;
    font-style: italic;
}

.quizedu-fc-tap-hint {
    position: absolute;
    bottom: 16px;
    left: 24px;
    font-size: 12px;
    color: #9ca3af;
}

/* ==================================================================
 * Rating buttons
 * ================================================================*/

.quizedu-fc-rating-buttons {
    text-align: center;
    margin-bottom: 20px;
}

.quizedu-fc-rating-label {
    font-size: 14px;
    color: #6B7280;
    margin-bottom: 12px;
}

.quizedu-fc-rating-row {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.quizedu-fc-rating-btn {
    padding: 10px 22px;
    border-radius: 10px;
    border: 2px solid;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    background: #fff;
    display: flex;
    align-items: center;
    gap: 6px;
}

.quizedu-fc-rating-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 700;
    background: rgba(0, 0, 0, 0.06);
    color: inherit;
}

.quizedu-fc-rating-wrong {
    border-color: #ef4444;
    color: #ef4444;
}
.quizedu-fc-rating-wrong:hover {
    background: #fef2f2;
}

.quizedu-fc-rating-hard {
    border-color: #f59e0b;
    color: #f59e0b;
}
.quizedu-fc-rating-hard:hover {
    background: #fffbeb;
}

.quizedu-fc-rating-good {
    border-color: #10b981;
    color: #10b981;
}
.quizedu-fc-rating-good:hover {
    background: #ecfdf5;
}

.quizedu-fc-rating-easy {
    border-color: #3b82f6;
    color: #3b82f6;
}
.quizedu-fc-rating-easy:hover {
    background: #eff6ff;
}

/* ==================================================================
 * Navigation
 * ================================================================*/

.quizedu-fc-navigation {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 16px;
}

.quizedu-fc-nav-btn {
    padding: 10px 24px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    background: #fff;
    font-size: 14px;
    font-weight: 600;
    color: #374151 !important;
    cursor: pointer;
    transition: all 0.2s;
}
.quizedu-fc-nav-btn:hover:not(:disabled) {
    border-color: var(--skin-color, #0F5BFF);
    color: var(--skin-color, #0F5BFF) !important;
}
.quizedu-fc-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ==================================================================
 * Keyboard shortcuts hint
 * ================================================================*/

.quizedu-fc-shortcuts {
    text-align: center;
    color: #9ca3af;
    font-size: 12px;
    margin-bottom: 24px;
}

/* ==================================================================
 * Empty state & session complete
 * ================================================================*/

.quizedu-fc-empty-state,
.quizedu-fc-session-complete {
    text-align: center;
    padding: 48px 24px;
}

.quizedu-fc-empty-state h3,
.quizedu-fc-session-complete h3 {
    font-size: 22px;
    font-weight: 700;
    color: #111827;
    margin-bottom: 12px;
}

.quizedu-fc-empty-message {
    color: #6B7280;
    font-size: 15px;
}

.quizedu-fc-session-stats {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin: 24px 0;
}

.quizedu-fc-session-stat {
    text-align: center;
}

.quizedu-fc-session-stat-number {
    display: block;
    font-size: 28px;
    font-weight: 700;
}

.quizedu-fc-session-correct  { color: #10b981; }
.quizedu-fc-session-incorrect { color: #ef4444; }
.quizedu-fc-session-total    { color: var(--skin-color, #0F5BFF); }

.quizedu-fc-session-stat span:last-child {
    font-size: 13px;
    color: #6B7280;
}

.quizedu-fc-restart-btn {
    margin-top: 8px;
}

/* ==================================================================
 * My Flashcards page — mini progress bar on deck cards
 * ================================================================*/

.quizedu-fc-progress-overview {
    margin-top: 12px;
}

.quizedu-fc-progress-bar-mini {
    display: flex;
    height: 6px;
    border-radius: 3px;
    background: #e5e7eb;
    overflow: hidden;
}

.quizedu-fc-bar-mastered {
    background: #10b981;
    transition: width 0.3s;
}

.quizedu-fc-bar-learning {
    background: #f59e0b;
    transition: width 0.3s;
}

.quizedu-fc-stat-new       { color: #6366f1; }
.quizedu-fc-stat-learning  { color: #f59e0b; }
.quizedu-fc-stat-mastered  { color: #10b981; }

/* ==================================================================
 * Responsive
 * ================================================================*/

@media (max-width: 768px) {
    .quizedu-fc-stats {
        grid-template-columns: repeat(2, 1fr);
    }

    .quizedu-fc-card-container {
        height: 300px;
    }

    .quizedu-fc-card-front,
    .quizedu-fc-card-back {
        padding: 28px 20px;
    }

    .quizedu-fc-card-text {
        font-size: 16px;
    }

    .quizedu-fc-rating-row {
        gap: 6px;
    }

    .quizedu-fc-rating-btn {
        padding: 8px 14px;
        font-size: 13px;
    }

    .quizedu-fc-session-stats {
        gap: 20px;
    }

    .quizedu-fc-study-title-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .quizedu-fc-mode-selector {
        gap: 6px;
    }

    .quizedu-fc-mode-btn,
    .quizedu-fc-reset-btn {
        padding: 6px 12px;
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .quizedu-fc-card-container {
        height: 260px;
    }

    .quizedu-fc-rating-btn {
        padding: 8px 10px;
        font-size: 12px;
    }

    .quizedu-fc-rating-key {
        display: none;
    }
}