/* Exam Simulator player + catalog + home styling.
   Shared across pages/exams/{index,detail,practice,review}.php. */

/* ---------- Catalog ---------- */

.exam-catalog-page,
.exam-home-page,
.exam-player-page,
.exam-review-page {
    padding: 1rem 1.5rem 3rem;
}

.exam-catalog-header h1,
.exam-home-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 0 0.25rem;
}

.exam-catalog-sub,
.exam-home-desc {
    color: var(--text-muted);
    margin: 0 0 1.25rem;
}

.exam-catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1rem;
}

.exam-card {
    display: block;
    text-decoration: none;
    color: inherit;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1.25rem;
    transition: border-color 0.15s, box-shadow 0.15s, transform 0.05s;
}
.exam-card:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    text-decoration: none;
}
.exam-card:active {
    transform: translateY(1px);
}
.exam-card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}
.exam-card-head h2 {
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.3;
    margin: 0;
}
.exam-card-desc {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.5;
    margin: 0 0 0.75rem;
}
.exam-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.exam-tag {
    display: inline-flex;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.55rem;
    border-radius: 4px;
    background: var(--bg-tertiary);
}
.exam-tag-free { color: var(--success); }
.exam-tag-paid { color: var(--accent); }

.exam-catalog-empty {
    padding: 2rem 1rem;
    color: var(--text-muted);
    text-align: center;
}

/* ---------- Exam home ---------- */

.exam-home-back {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--text-muted);
    text-decoration: none;
    margin-bottom: 0.5rem;
}
.exam-home-back:hover { color: var(--accent); }

.exam-home-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.exam-home-start {
    margin: 1.5rem 0;
    padding: 1.25rem 1.5rem;
}
.exam-home-start h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 0.25rem;
}
.exam-home-start-sub {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin: 0 0 1rem;
}
.exam-home-start-form {
    display: grid;
    gap: 1rem;
}
.exam-form-row {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 0.75rem;
    align-items: center;
}
.exam-form-row > label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}
.exam-form-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-top: 0.25rem;
}
.exam-form-error {
    color: var(--error);
    font-size: 0.875rem;
}

.exam-seg {
    display: inline-flex;
    gap: 0.25rem;
    padding: 0.15rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
}
.exam-seg-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.35rem 0.85rem;
    border-radius: 4px;
    color: var(--text-secondary);
    font: inherit;
    font-weight: 600;
}
.exam-seg-btn:hover { color: var(--text-primary); }
.exam-seg-btn.is-active {
    background: var(--bg-secondary);
    color: var(--accent);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.exam-home-domains h2 {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 1.5rem 0 0.5rem;
}
.exam-home-domains-list {
    display: grid;
    gap: 0.5rem;
}
.exam-domain-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.7rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.exam-domain-name { font-weight: 500; }
.exam-domain-meta {
    display: flex;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ---------- Player ---------- */

.exam-player-page {
    max-width: 820px;
    margin: 0 auto;
}

.exam-player-top { margin-bottom: 1rem; }

.exam-player-topline {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 1rem;
}
.exam-player-topline .exam-player-progress { flex: 1; min-width: 0; }

.exam-player-progress {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.exam-timer {
    font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, Consolas, monospace);
    font-size: 1.1rem;
    font-weight: 700;
    padding: 0.25rem 0.65rem;
    border-radius: 4px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    min-width: 64px;
    text-align: center;
    line-height: 1.4;
}
.exam-timer.is-warning {
    color: var(--warning);
    border-color: var(--warning);
}
.exam-timer.is-critical {
    color: var(--error);
    border-color: var(--error);
    background: color-mix(in srgb, var(--error) 10%, var(--bg-tertiary));
}

.exam-player-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}
.exam-player-footer .exam-keyboard-hint { margin-top: 0; text-align: right; }
.exam-player-progress-bar {
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
}
.exam-player-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.25s ease-out;
}

.exam-question {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin-bottom: 1rem;
}
.exam-exhibit {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.85rem 1rem;
    font-family: var(--font-mono, ui-monospace, SFMono-Regular, Menlo, Consolas, monospace);
    font-size: 0.875rem;
    white-space: pre-wrap;
    margin: 0 0 1rem;
    overflow-x: auto;
}
.exam-stem {
    font-size: 1.05rem;
    line-height: 1.55;
    margin-bottom: 1rem;
}
.exam-options-help {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.6rem;
}
.exam-options {
    display: grid;
    gap: 0.45rem;
}

.exam-option {
    position: relative;
    display: grid;
    grid-template-columns: 32px 1fr;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0.9rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: border-color 0.12s, background 0.12s;
}
.exam-option:hover { border-color: var(--accent); }
.exam-option.is-selected {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 8%, var(--bg-secondary));
}
.exam-option-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border-radius: 4px;
}
.exam-option.is-selected .exam-option-key {
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 18%, var(--bg-tertiary));
}
.exam-option-input { display: none; }
.exam-option-text { line-height: 1.45; }

/* Feedback markers (practice mode and review) */
.exam-option.is-correct {
    border-color: var(--success);
    background: color-mix(in srgb, var(--success) 10%, var(--bg-secondary));
}
.exam-option.is-correct .exam-option-key {
    color: var(--success);
    background: color-mix(in srgb, var(--success) 22%, var(--bg-tertiary));
}
.exam-option.is-incorrect {
    border-color: var(--error);
    background: color-mix(in srgb, var(--error) 10%, var(--bg-secondary));
}
.exam-option.is-incorrect .exam-option-key {
    color: var(--error);
    background: color-mix(in srgb, var(--error) 22%, var(--bg-tertiary));
}

.exam-option-marker {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Matching */
.exam-matching { display: grid; gap: 0.5rem; }
.exam-matching-row {
    display: grid;
    grid-template-columns: minmax(160px, 1fr) minmax(220px, 1fr);
    gap: 0.75rem;
    align-items: center;
    padding: 0.6rem 0.9rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.exam-matching-row.is-correct {
    border-color: var(--success);
    background: color-mix(in srgb, var(--success) 10%, var(--bg-secondary));
}
.exam-matching-row.is-incorrect {
    border-color: var(--error);
    background: color-mix(in srgb, var(--error) 10%, var(--bg-secondary));
}
.exam-matching-prompt { font-weight: 500; }
.exam-matching-correct-hint {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.exam-controls {
    margin-top: 1.25rem;
    display: flex;
    justify-content: flex-end;
}

.exam-feedback {
    margin-top: 1rem;
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius);
}
.exam-feedback-head {
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 0.4rem;
}
.exam-feedback-head.is-correct { color: var(--success); }
.exam-feedback-head.is-incorrect { color: var(--error); }
.exam-feedback-explanation {
    color: var(--text-secondary);
    line-height: 1.55;
    margin: 0 0 0.75rem;
}
.exam-feedback-actions { display: flex; justify-content: flex-end; }

.exam-keyboard-hint {
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: center;
}
.exam-keyboard-hint kbd {
    display: inline-block;
    padding: 0.1rem 0.4rem;
    font-family: inherit;
    font-size: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-bottom-width: 2px;
    border-radius: 4px;
    margin: 0 0.1rem;
}

/* ---------- Review ---------- */

.exam-review-page { max-width: 820px; margin: 0 auto; }

.exam-review-summary {
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.25rem;
}
.exam-review-headline {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.6rem;
}
.exam-review-headline.is-passed { color: var(--success); }
.exam-review-headline.is-missed { color: var(--warning); }

.exam-review-stats {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}
.exam-review-stats > div {
    display: flex;
    flex-direction: column;
}
.exam-review-stats strong { font-size: 1.3rem; }
.exam-review-stats span {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.exam-review-items {
    display: grid;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.exam-review-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1.25rem;
}
.exam-review-item.is-correct {
    border-left: 3px solid var(--success);
}
.exam-review-item.is-incorrect {
    border-left: 3px solid var(--error);
}
.exam-review-item-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}
.exam-review-item-pos {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
}
.exam-review-item-status {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.exam-review-item.is-correct .exam-review-item-status { color: var(--success); }
.exam-review-item.is-incorrect .exam-review-item-status { color: var(--error); }

.exam-options-review .exam-option {
    cursor: default;
}
.exam-options-review .exam-option:hover { border-color: var(--border); }
.exam-options-review .exam-option.is-correct:hover { border-color: var(--success); }
.exam-options-review .exam-option.is-incorrect:hover { border-color: var(--error); }

.exam-review-footer {
    display: flex;
    justify-content: center;
}

/* ---------- Exam Report (Phase 1b slice 3a) ---------- */

.exam-report-page {
    max-width: 820px;
    margin: 0 auto;
}
.exam-report-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 0.25rem;
}
.exam-report-sub {
    color: var(--text-muted);
    margin: 0 0 1.5rem;
    font-size: 0.9rem;
}
.exam-report-section {
    margin-top: 2rem;
}
.exam-report-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0 0 0.25rem;
}
.exam-report-hint {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 0 0 0.85rem;
}

.exam-home-links {
    margin-top: 0.75rem;
    display: flex;
    gap: 0.5rem;
}

.exam-readiness-card {
    padding: 1.5rem;
    margin: 0;
}
.exam-readiness-main {
    display: flex;
    align-items: flex-end;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}
.exam-readiness-score {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
    color: var(--accent);
}
.exam-readiness-score > span {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-left: 0.15rem;
}
.exam-readiness-sub { flex: 1; }
.exam-readiness-label {
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.exam-readiness-hint {
    color: var(--text-muted);
    font-size: 0.85rem;
}
.exam-readiness-bar {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}
.exam-readiness-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.4s ease-out;
}

.exam-weak-list {
    display: grid;
    gap: 0.5rem;
}
.exam-weak-row {
    display: grid;
    grid-template-columns: 32px 1fr auto;
    gap: 0.85rem;
    align-items: center;
    padding: 0.7rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.exam-weak-rank {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--accent);
    background: color-mix(in srgb, var(--accent) 12%, var(--bg-tertiary));
    border-radius: 4px;
}
.exam-weak-name > div:first-child {
    font-weight: 500;
}
.exam-weak-meta {
    display: flex;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}
.exam-weak-score {
    text-align: right;
    font-size: 0.85rem;
}
.exam-weak-mastery {
    font-weight: 700;
    font-size: 1rem;
    color: var(--warning);
}
.exam-weak-gap {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 0.1rem;
}

.exam-breakdown-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.exam-breakdown-table th,
.exam-breakdown-table td {
    padding: 0.6rem 0.85rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.exam-breakdown-table th.num,
.exam-breakdown-table td.num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}
.exam-breakdown-table th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.exam-mastery-list {
    display: grid;
    gap: 0.5rem;
}
.exam-mastery-row {
    display: grid;
    grid-template-columns: minmax(200px, 1fr) minmax(120px, 2fr) 70px;
    gap: 0.75rem;
    align-items: center;
    padding: 0.7rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.exam-mastery-name > div:first-child { font-weight: 500; }
.exam-mastery-meta {
    display: flex;
    gap: 0.35rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}
.exam-mastery-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}
.exam-mastery-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 3px;
    transition: width 0.4s ease-out;
}
.exam-mastery-score {
    text-align: right;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

/* ---------- SVG charts (Phase 1b slice 3b) ---------- */

.exam-chart-area {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.75rem;
}
.exam-chart-svg {
    width: 100%;
    height: auto;
    display: block;
}
.exam-chart-grid {
    stroke: var(--border);
    stroke-width: 1;
    stroke-dasharray: 2 3;
}
.exam-chart-grid.is-passing {
    stroke: var(--success);
    stroke-dasharray: 4 3;
    opacity: 0.55;
}
.exam-chart-tick {
    font-size: 11px;
    fill: var(--text-muted);
    font-family: inherit;
}
.exam-chart-line { pointer-events: none; }
.exam-chart-dot {
    cursor: default;
    transition: r 0.1s;
}
.exam-chart-dot:hover { r: 5; }
.exam-chart-bar:hover { opacity: 0.85; }

.exam-chart-legend {
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.exam-chart-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}
.exam-chart-legend-swatch {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 2px;
}
.exam-chart-legend-count {
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

/* ---------- Classroom heatmap + parent-child strip (Phase 2 slice 4d) ---------- */

.exam-heatmap-banner {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.6rem 0.85rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.exam-heatmap-scroll {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-secondary);
}

.exam-heatmap {
    border-collapse: collapse;
    width: 100%;
    min-width: 620px;
    font-size: 0.875rem;
}
.exam-heatmap thead th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.75rem;
    text-align: center;
    padding: 0.5rem 0.6rem;
    border-bottom: 1px solid var(--border);
    vertical-align: bottom;
}
.exam-heatmap-student-head {
    text-align: left !important;
    min-width: 180px;
}
.exam-heatmap-domain-name {
    display: block;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: none;
    letter-spacing: 0;
    line-height: 1.25;
}
.exam-heatmap-domain-meta {
    display: block;
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.7rem;
    margin-top: 0.15rem;
}

.exam-heatmap tbody th {
    text-align: left;
    padding: 0.55rem 0.75rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    vertical-align: middle;
}
.exam-heatmap-student {
    /* Sticky first column keeps the student name visible as the teacher
       scrolls through domains on mobile. */
    position: sticky;
    left: 0;
    z-index: 1;
    min-width: 180px;
    box-shadow: 1px 0 0 var(--border);
}
.exam-heatmap-student-name {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.35rem;
}
.exam-heatmap-student-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.1rem;
}
.exam-heatmap-sso-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.05rem 0.35rem;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    background: var(--accent-light, rgba(14,165,233,0.15));
    color: var(--accent);
    border-radius: 4px;
}

.exam-heatmap-cell {
    padding: 0.45rem 0.5rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
    min-width: 95px;
    vertical-align: middle;
}
.exam-heatmap-cell .exam-heatmap-score {
    display: block;
    font-weight: 700;
    font-size: 1rem;
    font-variant-numeric: tabular-nums;
}
.exam-heatmap-cell .exam-heatmap-sub {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.1rem;
}
.exam-heatmap-empty {
    font-size: 0.75rem;
    font-style: italic;
    color: var(--text-muted);
}

/* Four-tier color classes. Keyed to the 70 percent passing threshold so
   the eye maps to "passing vs. not" consistently across exams. */
.exam-heatmap-cell-untouched {
    background: var(--bg-tertiary);
}
.exam-heatmap-cell-low {
    background: color-mix(in srgb, var(--error) 18%, var(--bg-secondary));
    color: var(--text-primary);
}
.exam-heatmap-cell-mid {
    background: color-mix(in srgb, var(--warning) 22%, var(--bg-secondary));
    color: var(--text-primary);
}
.exam-heatmap-cell-high {
    background: color-mix(in srgb, var(--success) 22%, var(--bg-secondary));
    color: var(--text-primary);
}

/* Parent-dashboard strip: single row of pills, one per domain. */
.exam-strip-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}
.exam-strip-pills {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
    gap: 0.4rem;
}
.exam-strip-pill {
    padding: 0.5rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-align: center;
    min-height: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.1rem;
}
.exam-strip-pill-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.exam-strip-pill .exam-heatmap-score {
    font-size: 0.95rem;
}

/* Exam-picker row shared by classroom + parent. */
.exam-picker-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}
.exam-picker-row label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ---------- Modal (concurrency-lock, submit-confirm) ---------- */

.exam-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 1000;
}
.exam-modal[hidden] { display: none; }

.exam-modal-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.25);
}
.exam-modal-card h2 {
    font-size: 1.15rem;
    font-weight: 600;
    margin: 0 0 0.5rem;
}
.exam-modal-card p {
    color: var(--text-secondary);
    line-height: 1.55;
    margin: 0 0 1.25rem;
}
.exam-modal-actions {
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 0.5rem;
}

@media (max-width: 640px) {
    .exam-form-row {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }
    .exam-matching-row {
        grid-template-columns: 1fr;
    }
    .exam-player-topline {
        flex-direction: column;
        align-items: stretch;
    }
    .exam-timer { align-self: flex-end; }
    .exam-player-footer .exam-keyboard-hint { text-align: left; }
}