/* AI-MED Evaluation Dashboard Styles */
/* Design system: mirrors style.css from frontend-chat */

:root {
    /* Surfaces */
    --bg-app:        #f0f3f7;
    --bg-surface:    #ffffff;
    --bg-card:       #f0f3f6;
    --bg-deep:       #e8ecf0;

    /* Text */
    --text-heading:  #0a1f2e;
    --text-body:     #2c3e50;
    --text-secondary:#5a6b7a;
    --text-muted:    #8a96a3;

    /* Borders */
    --border:        #dce4ec;
    --border-strong: #c5cfd8;

    /* Accent */
    --accent:        #0b5d8a;
    --accent-hover:  #094a70;
    --accent-light:  #2d8abf;

    /* Status */
    --success:       #28a745;
    --warning:       #d69e2e;
    --danger:        #dc3545;

    /* Highlights (kept universal — yellow works on both themes) */
    --highlight-color: #fef3c7;
    --highlight-active: #fcd34d;

    /* Shadows */
    --shadow-sm:     0 1px 3px rgba(0,0,0,0.06);
    --shadow-md:     0 4px 12px rgba(0,0,0,0.08);

    /* Chat bubbles */
    --bubble-user-bg:   #0b5d8a;
    --bubble-user-text: #ffffff;
    --bubble-bot-bg:    #e8ecf0;
    --bubble-bot-text:  #2c3e50;

    /* Evidence */
    --evidence-bg:      #e0f0ff;
    --evidence-bg-hover:#c0dffa;
    --evidence-border:  #0b5d8a;

    /* Score badges */
    --badge-yes-bg:  #c6f6d5;
    --badge-yes-text:#166534;
    --badge-no-bg:   #fed7d7;
    --badge-no-text: #991b1b;

    /* Warning box */
    --warning-bg:    #fff3cd;
    --warning-border:#ffc107;
    --warning-text:  #856404;

    /* Item flags */
    --flag-ok-bg:       #d4edda;
    --flag-ok-text:     #155724;
    --flag-easy-bg:     #fff3cd;
    --flag-easy-text:   #856404;
    --flag-hard-bg:     #f8d7da;
    --flag-hard-text:   #721c24;

    /* Problematic items */
    --problematic-bg:     #fff5f5;
    --problematic-border: #fed7d7;

    /* Student list */
    --student-evidence-bg: #e0f0ff;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-app:        #15202b;
        --bg-surface:    #1a2530;
        --bg-card:       #1e2d3a;
        --bg-deep:       #0f1a22;

        --text-heading:  #e8edf2;
        --text-body:     #d4dee6;
        --text-secondary:#a0b4c4;
        --text-muted:    #6e8898;

        --border:        #2a3a48;
        --border-strong: #3a4e5e;

        --accent:        #3a9fd5;
        --accent-hover:  #2d8abf;
        --accent-light:  #5bb8e8;

        --success:       #4ade80;
        --warning:       #facc15;
        --danger:        #f87171;

        --shadow-sm:     0 1px 3px rgba(0,0,0,0.2);
        --shadow-md:     0 4px 12px rgba(0,0,0,0.4);

        --bubble-user-bg:   #0b5d8a;
        --bubble-user-text: #ffffff;
        --bubble-bot-bg:    #1e2d3a;
        --bubble-bot-text:  #d4dee6;

        --evidence-bg:      rgba(58,159,213,0.15);
        --evidence-bg-hover:rgba(58,159,213,0.25);
        --evidence-border:  #3a9fd5;

        --badge-yes-bg:  rgba(74,222,128,0.15);
        --badge-yes-text:#4ade80;
        --badge-no-bg:   rgba(248,113,113,0.15);
        --badge-no-text: #f87171;

        --warning-bg:    rgba(250,204,21,0.12);
        --warning-border:#facc15;
        --warning-text:  #facc15;

        --flag-ok-bg:       rgba(74,222,128,0.15);
        --flag-ok-text:     #4ade80;
        --flag-easy-bg:     rgba(250,204,21,0.15);
        --flag-easy-text:   #facc15;
        --flag-hard-bg:     rgba(248,113,113,0.15);
        --flag-hard-text:   #f87171;

        --problematic-bg:     rgba(248,113,113,0.08);
        --problematic-border: rgba(248,113,113,0.2);

        --student-evidence-bg: rgba(58,159,213,0.1);
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-app);
    color: var(--text-body);
    line-height: 1.6;
}

header {
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    color: var(--text-heading);
    padding: 2rem;
    text-align: center;
    position: relative;
}

header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: var(--text-heading);
}

header .subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

.back-link {
    position: absolute;
    top: 1rem;
    left: 1.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--accent);
}

main {
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
}

.card {
    background: var(--bg-surface);
    border-radius: 4px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    color: var(--text-heading);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
}

.hidden {
    display: none !important;
}

/* Summary Stats */
#summary-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.stat-box {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 4px;
    text-align: center;
}

.stat-box .value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent);
}

.stat-box .label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Timeline Chart */
.timeline-container {
    grid-column: 1 / -1;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.timeline-title {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.timeline-chart {
    display: flex;
    height: 160px;
    background: var(--bg-card);
    border-radius: 4px;
    padding: 0.5rem 0.5rem 0.5rem 0;
    overflow-x: auto;
    overflow-y: hidden;
}

.tl-y-axis {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding-right: 0.5rem;
    padding-bottom: 20px;
    min-width: 24px;
    flex-shrink: 0;
    text-align: right;
    position: sticky;
    left: 0;
    background: var(--bg-card);
    z-index: 1;
}

.tl-y-tick {
    font-size: 0.7rem;
    color: var(--text-muted);
    line-height: 1;
}

.tl-bars {
    flex: 1 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 3px;
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding-left: 4px;
    padding-bottom: 20px;
    position: relative;
}

.tl-bar {
    flex: 1;
    min-width: 20px;
    max-width: 60px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    position: relative;
}

.tl-fill {
    width: 70%;
    background: var(--accent-light);
    border-radius: 3px 3px 0 0;
    transition: background 0.2s;
}

.tl-bar:hover .tl-fill {
    background: var(--accent);
}

.tl-label {
    position: absolute;
    bottom: -16px;
    font-size: 0.6rem;
    color: var(--text-muted);
    white-space: nowrap;
    text-align: center;
}

/* Submissions Table */
.table-container {
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 4px;
}

#submissions-table {
    width: 100%;
    border-collapse: collapse;
}

#submissions-table th,
#submissions-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

#submissions-table th {
    background: var(--bg-card);
    font-weight: 600;
    color: var(--text-heading);
    position: sticky;
    top: 0;
    z-index: 1;
}

#submissions-table th.sortable {
    cursor: pointer;
    user-select: none;
}

#submissions-table th.sortable:hover {
    background: var(--bg-deep);
}

#submissions-table th .sort-arrow {
    color: var(--accent);
    font-size: 0.75rem;
}

#submissions-table tbody tr:hover {
    background: var(--bg-card);
}

/* Buttons */
.btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.15s;
}

.btn:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: var(--text-secondary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.15s;
}

.btn-secondary:hover {
    background: var(--text-body);
}

.btn-small {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
    color: var(--text-body);
    transition: background 0.15s;
}

.btn-small:hover:not(:disabled) {
    background: var(--bg-deep);
}

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

/* Detail View */
.detail-top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.detail-top-bar h2 {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.detail-nav-buttons {
    display: flex;
    gap: 0.5rem;
}

#detail-header {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--bg-card);
    border-radius: 4px;
    color: var(--text-body);
}

/* Profile card in detail */
.profile-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.profile-card h4 {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.profile-card .profile-row {
    display: flex;
    justify-content: space-between;
    padding: 0.25rem 0;
    font-size: 0.85rem;
}

.profile-card .profile-label {
    color: var(--text-muted);
    font-weight: 500;
}

/* Score Cards */
.scores-section {
    margin-bottom: 1.5rem;
}

.scores-section h3 {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.score-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.score-card {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 4px;
    text-align: center;
}

.score-card .category-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.score-card .score {
    font-size: 1.5rem;
    font-weight: bold;
}

.score-card .score.high {
    color: var(--success);
}

.score-card .score.medium {
    color: var(--warning);
}

.score-card .score.low {
    color: var(--danger);
}

/* Split View Layout */
.split-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 1100px) {
    .split-view {
        grid-template-columns: 1fr;
    }
}

.transcript-panel,
.rubric-panel {
    display: flex;
    flex-direction: column;
}

.panel-header {
    margin-bottom: 0.75rem;
}

.panel-header h3 {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.panel-header .hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Search Box */
.search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.search-box input {
    flex: 1;
    min-width: 150px;
    padding: 0.5rem;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    font-size: 0.875rem;
    background: var(--bg-surface);
    color: var(--text-body);
    font-family: inherit;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent);
}

#search-results-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 60px;
}

/* Transcript Box */
.transcript-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1rem;
    height: 600px;
    overflow-y: auto;
    font-size: 0.85rem;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
}

/* Chat Bubble Styles */
.chat-message {
    display: flex;
    flex-direction: column;
    margin-bottom: 0.75rem;
    max-width: 85%;
}

.chat-message.user {
    align-self: flex-end;
    margin-left: auto;
}

.chat-message.assistant {
    align-self: flex-start;
    margin-right: auto;
}

.chat-label {
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-muted);
}

.chat-message.user .chat-label {
    text-align: right;
}

.chat-bubble {
    padding: 0.6rem 0.9rem;
    border-radius: 12px;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.chat-message.user .chat-bubble {
    background: var(--bubble-user-bg);
    color: var(--bubble-user-text);
    border-bottom-right-radius: 4px;
}

.chat-message.assistant .chat-bubble {
    background: var(--bubble-bot-bg);
    color: var(--bubble-bot-text);
    border-bottom-left-radius: 4px;
}

/* Highlights inside chat bubbles */
.chat-bubble .search-highlight {
    background-color: rgba(254, 243, 199, 0.9);
    color: var(--text-body);
}

.chat-bubble .search-highlight.active {
    background-color: var(--highlight-active);
}

.chat-message.user .chat-bubble .search-highlight {
    background-color: rgba(255, 255, 255, 0.4);
    color: white;
}

.chat-message.user .chat-bubble .search-highlight.active {
    background-color: rgba(255, 255, 255, 0.7);
}

.chat-bubble .evidence-highlight {
    background-color: #fef08a;
}

.chat-message.user .chat-bubble .evidence-highlight {
    background-color: #fef08a;
}

/* Search Highlights */
.search-highlight {
    background-color: var(--highlight-color);
    padding: 0 2px;
    border-radius: 2px;
}

.search-highlight.active {
    background-color: var(--highlight-active);
    outline: 2px solid var(--warning);
}

/* Evidence Highlight */
.evidence-highlight {
    background-color: #fef08a;
    padding: 0 2px;
    border-radius: 2px;
    animation: pulse 1s ease-in-out;
}

@keyframes pulse {
    0%, 100% { background-color: #fef08a; }
    50% { background-color: #fde047; }
}

/* Field-sourced rubric sections */
.field-rubric-section {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 2px solid var(--border);
}

.field-rubric-section > h3 {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.source-data-panel {
    margin-top: 1rem;
}

.source-data-panel h4 {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.source-data-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1rem;
    min-height: 120px;
    max-height: 500px;
    overflow-y: auto;
    font-size: 0.85rem;
    white-space: pre-wrap;
    line-height: 1.7;
    color: var(--text-body);
}

/* Tab Buttons */
.tab-buttons {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    background: var(--bg-card);
    border-radius: 4px 4px 0 0;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s;
    font-family: inherit;
}

.tab-btn:hover {
    background: var(--bg-surface);
    color: var(--text-body);
}

.tab-btn.active {
    background: var(--bg-surface);
    border-bottom-color: var(--bg-surface);
    color: var(--accent);
    font-weight: 600;
}

/* Scoring Panel */
.scoring-panel {
    display: flex;
    flex-direction: column;
}

.scoring-scrollable {
    height: 600px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 0 4px 4px 4px;
    background: var(--bg-card);
}

.rubric-category {
    margin-bottom: 0;
}

.rubric-category h4 {
    background: var(--accent);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    position: sticky;
    top: 0;
    z-index: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    user-select: none;
}

.rubric-category h4:hover {
    filter: brightness(1.1);
}

.rubric-category h4 .collapse-icon {
    transition: transform 0.2s ease;
    font-size: 0.6rem;
}

.rubric-category:not(.collapsed) h4 .collapse-icon {
    transform: rotate(90deg);
}

.rubric-category .rubric-items {
    max-height: 2000px;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.rubric-category.collapsed .rubric-items {
    max-height: 0;
}

.rubric-items {
    border: none;
    border-radius: 0;
    background: var(--bg-surface);
}

.rubric-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
}

.rubric-item-header {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.rubric-item .score-badge {
    display: inline-block;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-weight: bold;
    font-size: 0.75rem;
    text-align: center;
    flex-shrink: 0;
}

.rubric-item .score-badge.yes {
    background: var(--badge-yes-bg);
    color: var(--badge-yes-text);
}

.rubric-item .score-badge.no {
    background: var(--badge-no-bg);
    color: var(--badge-no-text);
}

.rubric-item .description {
    font-size: 0.8rem;
    flex: 1;
    color: var(--text-body);
}

.rubric-item .evidence {
    font-size: 0.75rem;
    color: var(--accent);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    background: var(--evidence-bg);
    border-radius: 4px;
    margin-left: 1.5rem;
    border-left: 3px solid var(--evidence-border);
}

.rubric-item .evidence:hover {
    background: var(--evidence-bg-hover);
}

/* Checklist Section */
.checklist-section-group {
    margin-bottom: 0;
}

.checklist-section-group h4 {
    background: var(--text-secondary);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    position: sticky;
    top: 0;
    z-index: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    user-select: none;
}

.checklist-section-group h4:hover {
    filter: brightness(1.1);
}

.checklist-section-group h4 .collapse-icon {
    transition: transform 0.2s ease;
    font-size: 0.6rem;
}

.checklist-section-group:not(.collapsed) h4 .collapse-icon {
    transform: rotate(90deg);
}

.checklist-section-group.collapsed h4 {
    border-radius: 4px;
}

.checklist-section-group .checklist-items {
    max-height: 2000px;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.checklist-section-group.collapsed .checklist-items {
    max-height: 0;
    border: none;
}

.checklist-items {
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 4px 4px;
    background: var(--bg-surface);
}

.checklist-item {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
}

.checklist-item:last-child {
    border-bottom: none;
}

.checklist-item .check-icon {
    font-size: 1rem;
    flex-shrink: 0;
}

.checklist-item .checklist-question {
    flex: 1;
    color: var(--text-body);
}

.checklist-item .evidence {
    width: 100%;
    font-size: 0.75rem;
    color: var(--accent);
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    background: var(--evidence-bg);
    border-radius: 4px;
    margin-left: 1.5rem;
    margin-top: 0.25rem;
    border-left: 3px solid var(--evidence-border);
}

.checklist-item .evidence:hover {
    background: var(--evidence-bg-hover);
}

.checklist-item .check-icon.yes {
    color: var(--success);
}

.checklist-item .check-icon.no {
    color: var(--danger);
}

/* Notes Section */
.notes-section {
    margin-top: 1.5rem;
}

.notes-section h3 {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

#ai-notes {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 4px;
    font-style: italic;
    font-size: 0.9rem;
    color: var(--text-body);
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ============ Global Search ============ */

#global-search {
    padding: 1rem 1.5rem;
}

.global-search-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.global-search-container input {
    flex: 1;
    min-width: 250px;
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    font-size: 0.9rem;
    background: var(--bg-surface);
    color: var(--text-body);
    font-family: inherit;
}

.global-search-container input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(11, 93, 138, 0.1);
}

@media (prefers-color-scheme: dark) {
    .global-search-container input:focus {
        box-shadow: 0 0 0 3px rgba(58, 159, 213, 0.2);
    }
}

#global-search-count {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============ View Toggle ============ */

.submissions-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
    flex-wrap: wrap;
    gap: 0.5rem;
}

.submissions-header h2 {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.view-toggle {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-card);
    padding: 0.25rem;
    border-radius: 4px;
    flex-wrap: wrap;
}

.toggle-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s;
    font-family: inherit;
}

.toggle-btn:hover {
    color: var(--text-body);
}

.toggle-btn.active {
    background: var(--bg-surface);
    color: var(--accent);
    box-shadow: var(--shadow-sm);
}

/* ============ Overview Sections ============ */

.overview-section {
    padding-top: 0.5rem;
}

.overview-content {
    max-height: 500px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 4px;
}

.overview-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border-radius: 4px;
    position: sticky;
    top: 0;
    z-index: 2;
    flex-wrap: wrap;
}

.overview-controls label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.overview-controls select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-strong);
    border-radius: 4px;
    font-size: 0.85rem;
    background: var(--bg-surface);
    color: var(--text-body);
    cursor: pointer;
    min-width: 180px;
    font-family: inherit;
}

.overview-controls select:focus {
    outline: none;
    border-color: var(--accent);
}

.overview-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 1rem;
}

.overview-category {
    margin-bottom: 1.5rem;
}

.overview-category h4 {
    background: var(--accent);
    color: white;
    padding: 0.6rem 1rem;
    border-radius: 4px 4px 0 0;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    user-select: none;
}

.overview-category h4:hover {
    filter: brightness(1.1);
}

.overview-category h4 .collapse-icon {
    transition: transform 0.2s ease;
    font-size: 0.6rem;
}

.overview-category:not(.collapsed) h4 .collapse-icon {
    transform: rotate(90deg);
}

.overview-category.collapsed h4 {
    border-radius: 4px;
}

.overview-category .overview-items {
    max-height: 2000px;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.overview-category.collapsed .overview-items {
    max-height: 0;
    border: none;
}

.overview-category h4 .cat-stat {
    font-weight: normal;
    opacity: 0.9;
    font-size: 0.8rem;
}

.overview-items {
    border: 1px solid var(--border);
    border-top: none;
    border-radius: 0 0 4px 4px;
    background: var(--bg-surface);
}

.overview-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-body);
}

.overview-item:last-child {
    border-bottom: none;
}

.overview-item.clickable {
    cursor: pointer;
    transition: background 0.2s;
}

.overview-item.clickable:hover {
    background: var(--bg-card);
}

.overview-item-info {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.overview-item-name {
    font-size: 0.85rem;
    flex: 1;
}

.overview-item-stat {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
}

/* Progress Bar */
.progress-bar {
    height: 6px;
    background: var(--bg-deep);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s ease;
}

.progress-fill.high {
    background: var(--success);
}

.progress-fill.medium {
    background: var(--warning);
}

.progress-fill.low {
    background: var(--danger);
}

/* ============ Global Stats Panel ============ */

#global-stats {
    border: 2px solid var(--accent);
}

.global-stats-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
}

.global-stats-header h2 {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
    font-size: 1.1rem;
}

.measure-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.measure-stat-box {
    background: var(--bg-card);
    padding: 1rem;
    border-radius: 4px;
    text-align: center;
}

.measure-stat-box .stat-value {
    font-size: 1.75rem;
    font-weight: bold;
    color: var(--accent);
}

.measure-stat-box .stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.measure-category {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.measure-results h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 1rem 0 0.5rem 0;
}

.student-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-surface);
}

.student-list.earned {
    border-left: 3px solid var(--success);
}

.student-list.not-earned {
    border-left: 3px solid var(--danger);
}

.student-row {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.2s;
}

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

.student-row:hover {
    background: var(--bg-card);
}

.student-uid {
    font-weight: 600;
    color: var(--accent);
    margin-right: 0.75rem;
}

.student-scenario {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.student-evidence {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    padding: 0.25rem 0.5rem;
    background: var(--student-evidence-bg);
    border-radius: 4px;
    font-style: italic;
}

.no-students,
.loading {
    padding: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.85rem;
}

/* ============ Psychometrics Panel ============ */

.psychometrics-warning {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    border-radius: 4px;
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    color: var(--warning-text);
}

#reliability-summary {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.reliability-card {
    flex: 1;
    min-width: 150px;
    max-width: 200px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1rem;
    text-align: center;
}

.reliability-card .scale-name {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.reliability-card .alpha-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
}

.reliability-card .alpha-label {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.reliability-card.good .alpha-value { color: var(--success); }
.reliability-card.acceptable .alpha-value { color: var(--warning); }
.reliability-card.poor .alpha-value { color: var(--danger); }

.sem-display {
    flex: 1;
    min-width: 150px;
    max-width: 200px;
    background: var(--bg-card);
    border-radius: 4px;
    padding: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.sem-display .sem-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-body);
}

.sem-display .sem-label {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Item Analysis Table */
.item-analysis-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.item-analysis-table th {
    background: var(--bg-card);
    padding: 0.5rem;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
    color: var(--text-heading);
}

.item-analysis-table td {
    padding: 0.5rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-body);
}

.item-analysis-table tr:hover {
    background: var(--bg-card);
}

.item-analysis-table .item-id {
    font-family: monospace;
    font-size: 0.8rem;
}

.item-analysis-table .numeric {
    text-align: right;
    font-family: monospace;
}

/* Item Flags */
.item-flag {
    display: inline-block;
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-size: 0.7rem;
    font-weight: 500;
}

.item-flag.ok { background: var(--flag-ok-bg); color: var(--flag-ok-text); }
.item-flag.too-easy { background: var(--flag-easy-bg); color: var(--flag-easy-text); }
.item-flag.too-hard { background: var(--flag-hard-bg); color: var(--flag-hard-text); }
.item-flag.low-disc { background: var(--flag-hard-bg); color: var(--flag-hard-text); }

/* Problematic Items Section */
#problematic-items {
    margin-top: 1.5rem;
}

.problematic-items-list {
    background: var(--problematic-bg);
    border: 1px solid var(--problematic-border);
    border-radius: 4px;
    padding: 1rem;
    max-height: 200px;
    overflow-y: auto;
}

.problematic-item {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--problematic-border);
    font-size: 0.85rem;
    color: var(--text-body);
}

.problematic-item:last-child { border-bottom: none; }
.problematic-item .item-name { font-weight: 600; }

/* Score Distribution */
#score-distributions { margin-top: 1.5rem; }

.histogram {
    display: flex;
    align-items: flex-end;
    gap: 2px;
    height: 100px;
    padding: 0.5rem 0;
    border-bottom: 2px solid var(--border);
}

.histogram-bar {
    flex: 1;
    background: var(--accent);
    min-width: 8px;
    border-radius: 2px 2px 0 0;
    transition: opacity 0.2s;
}

.histogram-bar:hover { opacity: 0.8; }

.histogram-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.distribution-stats {
    display: flex;
    gap: 2rem;
    margin-top: 0.75rem;
    font-size: 0.85rem;
}

.distribution-stats .stat {
    display: flex;
    gap: 0.5rem;
}

.distribution-stats .stat-label { color: var(--text-muted); }
.distribution-stats .stat-value { font-weight: 600; color: var(--text-body); }

/* PCA Section */
#pca-analysis { margin-top: 1.5rem; }

.pca-warning {
    background: var(--bg-deep);
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.biplot-container {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
    flex-wrap: wrap;
}

.biplot {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 4px;
}

.biplot-axis-x { position: absolute; top: 50%; left: 0; right: 0; height: 1px; background: var(--border-strong); }
.biplot-axis-y { position: absolute; left: 50%; top: 0; bottom: 0; width: 1px; background: var(--border-strong); }

.biplot-point {
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
    border: 1px solid rgba(255,255,255,0.8);
}

.biplot-point:hover {
    transform: translate(-50%, -50%) scale(1.5);
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
    z-index: 10;
}

.biplot-point[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-heading);
    color: var(--bg-surface);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    white-space: nowrap;
    z-index: 100;
    margin-bottom: 5px;
    pointer-events: none;
}

.biplot-label-x { position: absolute; bottom: 4px; right: 8px; font-size: 0.7rem; color: var(--text-muted); }
.biplot-label-y { position: absolute; top: 8px; left: 8px; font-size: 0.7rem; color: var(--text-muted); }

.biplot-legend { display: flex; flex-direction: column; gap: 0.5rem; font-size: 0.8rem; color: var(--text-body); }
.biplot-legend-item { display: flex; align-items: center; gap: 0.5rem; }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.biplot-hint { font-size: 0.8rem; color: var(--text-muted); font-style: italic; margin-top: 0.75rem; }

#psychometrics-overview .overview-category h4 { background: var(--text-secondary); }

.psychometrics-section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-heading);
    margin: 1.5rem 0 0.75rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border);
}

/* ============ Comparisons Panel ============ */

#comparisons-overview .psychometrics-warning { margin-bottom: 1.5rem; }
#score-comparison { margin-bottom: 2rem; }

.comparison-chart {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.comparison-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

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

.comparison-label {
    width: 120px;
    flex-shrink: 0;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-body);
}

.comparison-bar-container {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.comparison-bar {
    height: 24px;
    background: var(--accent);
    border-radius: 4px;
    min-width: 4px;
    transition: width 0.3s ease;
}

.comparison-value {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-body);
    white-space: nowrap;
}

.comparison-n {
    width: 50px;
    flex-shrink: 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: right;
}

.comparison-row.compact { padding: 0.3rem 0; }
.comparison-label.small { width: 80px; font-size: 0.75rem; }
.comparison-value.small { font-size: 0.75rem; }
.comparison-chart.compact { padding: 0.5rem; }

.category-comparison-block { margin-bottom: 1.5rem; }
.category-comparison-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}
.category-comparison-header .category-name { font-weight: 600; font-size: 0.85rem; color: var(--text-heading); }
.category-comparison-header .category-test { font-size: 0.75rem; color: var(--text-muted); }
.category-comparison-header .category-test.significant { color: var(--success); font-weight: 600; }

/* Statistical Test Results */
.statistical-test {
    background: var(--bg-card);
    border-radius: 4px;
    padding: 1rem;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-body);
}

.statistical-test .sig-indicator { color: var(--success); font-weight: bold; }
.statistical-test.significant { border-left: 3px solid var(--success); }
.statistical-test.not-significant { border-left: 3px solid var(--text-muted); }

/* DIF Analysis Table */
#dif-analysis { margin-bottom: 2rem; }
#category-comparison { margin-bottom: 2rem; }

.dif-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.dif-table th {
    background: var(--bg-card);
    padding: 0.6rem 0.75rem;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1;
    color: var(--text-heading);
}

.dif-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-body);
}

.dif-table tr:hover { background: var(--bg-card); }

.dif-table .rate-cell { text-align: center; font-family: monospace; }
.dif-table .rate-cell.high { background: rgba(40, 167, 69, 0.15); color: var(--success); }
.dif-table .rate-cell.medium { background: rgba(214, 158, 46, 0.15); color: var(--warning); }
.dif-table .rate-cell.low { background: rgba(220, 53, 69, 0.15); color: var(--danger); }
.dif-table .item-id { font-family: monospace; font-size: 0.75rem; color: var(--text-muted); }
.dif-table tr.significant { background: rgba(40, 167, 69, 0.05); }

@media (prefers-color-scheme: dark) {
    .dif-table .rate-cell.high { background: rgba(74, 222, 128, 0.12); }
    .dif-table .rate-cell.medium { background: rgba(250, 204, 21, 0.12); }
    .dif-table .rate-cell.low { background: rgba(248, 113, 113, 0.12); }
    .dif-table tr.significant { background: rgba(74, 222, 128, 0.05); }
}

.more-items {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    padding: 0.75rem;
}

.no-data-message {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
}

/* ============ Mobile ============ */

@media (max-width: 640px) {
    header { padding: 1.5rem 1rem; }
    header h1 { font-size: 1.4rem; }
    main { padding: 1rem; }
    .card { padding: 1rem; }
    .split-view { grid-template-columns: 1fr; }
}