/**
 * Diagram Labeling Question Styles - F-030 Phase 4C-4
 *
 * Styles for diagram labeling questions with positioned input overlays
 *
 * Features:
 * - Responsive diagram container
 * - Absolutely positioned label inputs
 * - Visual feedback (pending/correct/incorrect states)
 * - Score display with animation
 * - Mobile responsive (<640px)
 */

/* ==================== DIAGRAM CONTAINER ==================== */
/* Note: Container frame comes from parent .question-display */

.quiz-diagram-label {
    width: 100%;
    animation: diagramContentFadeIn 300ms ease-out;
}

@keyframes diagramContentFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.diagram-container {
    width: 100%;
    margin: var(--space-lg) 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.diagram-wrapper {
    position: relative;
    width: 100%;
    /* padding-bottom set inline based on aspect ratio */
}

.diagram-image {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    user-select: none;
    -webkit-user-drag: none;
}

.diagram-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Allow clicks through overlay to inputs */
}

/* ==================== LABEL INPUTS ==================== */

.diagram-label-input {
    /* Position set inline per label */
    position: absolute;
    pointer-events: auto; /* Enable interaction */

    /* Styling */
    padding: var(--space-xs) var(--space-sm);
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-primary);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: var(--font-sm);
    font-family: inherit;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);

    /* Transitions */
    transition: all var(--transition-fast);

    /* Center on point */
    transform: translate(-50%, -50%);
}

.diagram-label-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2),
                0 2px 8px rgba(0, 0, 0, 0.15);
    background: rgba(255, 255, 255, 1);
    z-index: 10;
}

.diagram-label-input::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

/* ==================== LABEL INPUT STATES ==================== */

/* Pending state (not yet validated) */
.diagram-label-input.diagram-label-pending {
    border-color: var(--border);
    background: rgba(255, 255, 255, 0.95);
}

.diagram-label-input.diagram-label-pending:hover {
    border-color: var(--border-light);
    background: rgba(255, 255, 255, 1);
}

/* Correct state (answer is correct) */
.diagram-label-input.diagram-label-correct {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
    font-weight: 600;
}

.diagram-label-input.diagram-label-correct:focus {
    border-color: var(--success);
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.2),
                0 2px 8px rgba(0, 0, 0, 0.15);
}

/* Incorrect state (answer is wrong) */
.diagram-label-input.diagram-label-incorrect {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.diagram-label-input.diagram-label-incorrect:focus {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2),
                0 2px 8px rgba(0, 0, 0, 0.15);
}

/* ==================== SCORE DISPLAY ==================== */

.diagram-score-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}

.diagram-score-label {
    font-size: var(--font-base);
    font-weight: 600;
    color: var(--text-secondary);
}

.diagram-score-value {
    font-size: var(--font-lg);
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.diagram-score-updating {
    animation: score-pulse 0.3s ease;
}

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

/* ==================== RESPONSIVE DESIGN ==================== */

/* Tablet and below */
@media (max-width: 768px) {
    .diagram-container {
        margin: var(--space-md) 0;
    }

    .diagram-label-input {
        font-size: 12px;
        padding: 4px 6px;
        min-width: 80px;
        max-width: 140px;
    }

    .diagram-score-container {
        margin: var(--space-md) 0;
    }

    .diagram-score-label {
        font-size: var(--font-sm);
    }

    .diagram-score-value {
        font-size: var(--font-base);
    }
}

/* Mobile */
@media (max-width: 640px) {
    .diagram-container {
        margin: var(--space-sm) 0;
        border-radius: var(--radius-md);
    }

    .diagram-label-input {
        font-size: 11px;
        padding: 3px 5px;
        min-width: 60px;
        max-width: 120px;
        border-width: 1.5px;
    }

    .diagram-label-input:focus {
        box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2),
                    0 2px 6px rgba(0, 0, 0, 0.1);
    }

    .diagram-score-container {
        flex-direction: column;
        gap: var(--space-xs);
        padding: var(--space-sm);
    }

    .diagram-score-label,
    .diagram-score-value {
        font-size: var(--font-sm);
    }
}

/* ==================== PRINT STYLES ==================== */

@media print {
    .diagram-container {
        border: 2px solid #000;
        page-break-inside: avoid;
    }

    .diagram-label-input {
        border: 1px solid #000;
        background: white;
        box-shadow: none;
    }

    .diagram-score-container {
        border: 1px solid #000;
    }
}

/* ==================== ACCESSIBILITY ==================== */

/* High contrast mode support */
@media (prefers-contrast: high) {
    .diagram-label-input {
        border-width: 3px;
    }

    .diagram-label-input.diagram-label-correct {
        background: rgba(34, 197, 94, 0.2);
    }

    .diagram-label-input.diagram-label-incorrect {
        background: rgba(239, 68, 68, 0.2);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .diagram-label-input,
    .diagram-score-value {
        transition: none;
        animation: none;
    }

    .diagram-score-updating {
        animation: none;
    }
}

/* Focus visible (keyboard navigation) */
.diagram-label-input:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

/* ==================== stemImage Support (SF-069.3) ==================== */

.quiz-stem-image {
    display: block;
    margin: 1rem auto;
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid var(--border-secondary, #e0e0e0);
}

/* Maths SVGs use light text on transparent bg — add dark card background */
.quiz-stem-image--dark {
    background-color: #1e293b;
    border-color: #334155;
    padding: 0.75rem;
}

@media (prefers-color-scheme: dark) {
    .quiz-stem-image--dark {
        background-color: #0f172a;
        border-color: #1e293b;
    }
}

@media (max-width: 768px) {
    .quiz-stem-image {
        max-width: 100% !important;
        margin: 0.75rem auto;
        border-radius: 6px;
    }
    .quiz-stem-image--dark {
        padding: 0.5rem;
    }
}

@media print {
    .quiz-stem-image {
        max-width: 80%;
        border: 1px solid #999;
    }
    .quiz-stem-image--dark {
        background-color: #1e293b;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
}