/* ============================================
   Compare Tab Styles
   ============================================ */

/* Home tabs (Upload / Compare) */
.home-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius);
    padding: 0.25rem;
    border: 1px solid var(--border-color);
}
.home-tab {
    flex: 1;
    padding: 0.55rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: calc(var(--radius) - 2px);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}
.home-tab:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}
.home-tab.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.home-tab svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* Tab panels */
.home-tab-panel {
    display: none;
}
.home-tab-panel.active {
    display: block;
    animation: compareFadeIn 0.25s ease;
}

@keyframes compareFadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Wide mode for comparison */
.upload-page--wide {
    max-width: 1100px;
}

/* ============================================
   Selection step
   ============================================ */
.compare-selection-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}
.compare-selection-count {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}
/* .compare-search uses shared .session-search from upload.css */
.compare-btn {
    flex-shrink: 0;
}

/* Session cards – clickable selection */
.prev-session-item.compare-selectable {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
    cursor: pointer;
    user-select: none;
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s, opacity 0.2s;
}
.prev-session-item.compare-full:not(.compare-selected) {
    opacity: 0.45;
    cursor: default;
}
.prev-session-item.compare-selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(96,165,250,0.18);
    background: rgba(96,165,250,0.06);
}
.prev-session-item.compare-selected--a {
    border-color: #60a5fa;
    box-shadow: 0 0 0 2px rgba(96,165,250,0.22);
    background: rgba(96,165,250,0.08);
}
.prev-session-item.compare-selected--b {
    border-color: #34d399;
    box-shadow: 0 0 0 2px rgba(52,211,153,0.22);
    background: rgba(52,211,153,0.08);
}

/* Label slot + A/B badges */
.compare-session-label-slot {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    flex-shrink: 0;
}
.compare-session-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    flex-shrink: 0;
}
.compare-session-label--a {
    background: rgba(96,165,250,0.2);
    color: #60a5fa;
}
.compare-session-label--b {
    background: rgba(52,211,153,0.2);
    color: #34d399;
}

/* ============================================
   Results layout
   ============================================ */
.compare-results {
    display: none;
}
.compare-results.active {
    display: block;
    animation: compareFadeIn 0.3s ease;
}

.compare-results-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}
.compare-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-secondary);
    font-size: 0.82rem;
    cursor: pointer;
    transition: all 0.15s;
}
.compare-back-btn:hover {
    color: var(--text-primary);
    border-color: var(--primary);
}
.compare-back-btn svg {
    width: 14px;
    height: 14px;
}
.compare-vs-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.compare-vs-sep {
    color: var(--text-muted);
    font-weight: 400;
}

/* ============================================
   Compare cards
   ============================================ */
.compare-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin-bottom: 1rem;
}
.compare-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.compare-card-title svg {
    width: 18px;
    height: 18px;
    color: var(--primary);
}

/* Warning banner */
.compare-warning {
    padding: 0.6rem 0.85rem;
    background: rgba(251,191,36,0.1);
    border: 1px solid rgba(251,191,36,0.25);
    border-radius: var(--radius);
    color: #fbbf24;
    font-size: 0.82rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ============================================
   Overview table
   ============================================ */
.compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
}
.compare-table th,
.compare-table td {
    padding: 0.5rem 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.compare-table th {
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}
.compare-table td {
    color: var(--text-primary);
}
.compare-table .col-a {
    background: rgba(96,165,250,0.04);
}
.compare-table .col-b {
    background: rgba(52,211,153,0.04);
}
.compare-table .col-label {
    width: 160px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Column headers with labels */
.compare-col-header {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

/* ============================================
   Delta indicators
   ============================================ */
.delta-positive {
    color: var(--accent);
}
.delta-negative {
    color: var(--danger);
}
.delta-neutral {
    color: var(--text-muted);
}
.delta-bold {
    font-weight: 700;
}

/* ============================================
   ML Config chips
   ============================================ */
.compare-chip-added {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    padding: 0.15rem 0.5rem;
    background: rgba(52,211,153,0.12);
    color: var(--accent);
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    margin: 0.15rem;
}
.compare-chip-removed {
    display: inline-flex;
    align-items: center;
    gap: 0.2rem;
    padding: 0.15rem 0.5rem;
    background: rgba(248,113,113,0.12);
    color: var(--danger);
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    margin: 0.15rem;
}
.compare-chip-common {
    display: inline-flex;
    align-items: center;
    padding: 0.15rem 0.5rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    margin: 0.15rem;
    cursor: pointer;
}
.compare-chip-common:hover { background: var(--bg-tertiary); }
.compare-common-list {
    display: none;
    flex-wrap: wrap;
    margin-top: 0.25rem;
}
.compare-common-list.open { display: flex; }
.compare-common-list .compare-chip-common-item {
    display: inline-flex;
    align-items: center;
    padding: 0.15rem 0.5rem;
    background: var(--bg-secondary);
    color: var(--text-muted);
    border-radius: 4px;
    font-size: 0.7rem;
    margin: 0.15rem;
}
.compare-chip-model {
    display: inline-flex;
    align-items: center;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
    margin: 0.15rem;
}
.compare-chip-model--common {
    background: rgba(96,165,250,0.12);
    color: var(--primary);
}
.compare-chip-model--only-a {
    background: rgba(96,165,250,0.08);
    color: rgba(96,165,250,0.6);
}
.compare-chip-model--only-b {
    background: rgba(52,211,153,0.08);
    color: rgba(52,211,153,0.6);
}

/* ============================================
   Metric selector
   ============================================ */
.compare-metric-selector {
    display: flex;
    gap: 0.2rem;
    margin-bottom: 0.75rem;
    background: var(--bg-body);
    border-radius: var(--radius);
    padding: 0.2rem;
    border: 1px solid var(--border-color);
    width: fit-content;
}
.compare-metric-btn {
    padding: 0.3rem 0.7rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: calc(var(--radius) - 2px);
    transition: all 0.15s;
}
.compare-metric-btn:hover {
    color: var(--text-primary);
}
.compare-metric-btn.active {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Model selector */
.compare-model-selector {
    display: flex;
    gap: 0.2rem;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
}
.compare-model-btn {
    padding: 0.3rem 0.7rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--radius);
    transition: all 0.15s;
}
.compare-model-btn:hover {
    color: var(--text-primary);
    border-color: var(--primary);
}
.compare-model-btn.active {
    background: rgba(96,165,250,0.12);
    color: var(--primary);
    border-color: var(--primary);
}

/* ============================================
   Compare charts
   ============================================ */
.compare-chart {
    width: 100%;
    min-height: 300px;
    margin-top: 0.75rem;
}

/* ============================================
   Performance table
   ============================================ */
.compare-perf-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
    margin-bottom: 0.5rem;
}
.compare-perf-table th,
.compare-perf-table td {
    padding: 0.5rem 0.75rem;
    text-align: right;
    border-bottom: 1px solid var(--border-color);
}
.compare-perf-table th:first-child,
.compare-perf-table td:first-child {
    text-align: left;
}
.compare-perf-table th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.78rem;
}
.compare-perf-table td {
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.compare-perf-table tbody tr:hover {
    background: var(--bg-secondary);
}

/* Only-in section below performance table */
.compare-only-in {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--bg-body);
    border-radius: var(--radius);
}

/* ============================================
   Data quality comparison
   ============================================ */
.compare-dq-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
    font-size: 0.82rem;
}
.compare-dq-label {
    width: 180px;
    flex-shrink: 0;
    color: var(--text-secondary);
    font-weight: 500;
}
.compare-dq-val {
    flex: 1;
    color: var(--text-primary);
}
.compare-dq-better {
    color: var(--accent);
    font-weight: 600;
}
.compare-diff-pos {
    color: var(--accent);
    font-size: 0.82em;
    font-weight: 600;
    margin-left: 0.25rem;
}
.compare-diff-neg {
    color: var(--warning);
    font-size: 0.82em;
    font-weight: 600;
    margin-left: 0.25rem;
}
.compare-overview-cols-detail {
    padding: 0.5rem 0.75rem 0.75rem;
    border-top: 1px solid var(--border);
}

/* ============================================
   Importance table
   ============================================ */
.compare-imp-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
}
.compare-imp-table th,
.compare-imp-table td {
    padding: 0.4rem 0.65rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.compare-imp-table th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.78rem;
}
.compare-imp-table td {
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.compare-rank-up {
    color: var(--accent);
}
.compare-rank-down {
    color: var(--danger);
}
.compare-rank-new {
    color: var(--primary);
    font-style: italic;
    font-size: 0.72rem;
}
.compare-rank-absent {
    color: var(--text-muted);
    font-style: italic;
    font-size: 0.72rem;
}

/* Extra rows hidden by default, shown when expanded */
.compare-imp-table tr.compare-imp-extra { display: none; }
.compare-imp-table.compare-imp-expanded tr.compare-imp-extra { display: table-row; }
.compare-imp-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: 0.5rem;
    padding: 0.35rem 0.75rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.78rem;
    cursor: pointer;
    transition: background 0.15s;
}
.compare-imp-toggle:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.compare-imp-toggle svg { transition: transform 0.2s; }

/* ============================================
   Empty state
   ============================================ */
.compare-empty {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}
.compare-empty svg {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    opacity: 0.4;
}

/* ============================================
   Section description
   ============================================ */
.compare-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.5;
}

/* ============================================
   Prediction comparison
   ============================================ */
.compare-pred-upload {
    margin-top: 0.75rem;
}
.compare-pred-drop {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}
.compare-pred-drop:hover,
.compare-pred-drop.dragover {
    border-color: var(--primary);
    background: rgba(96,165,250,0.04);
    color: var(--text-secondary);
}
.compare-pred-drop svg {
    display: block;
    margin: 0 auto 0.5rem;
    width: 32px;
    height: 32px;
    opacity: 0.5;
}
.compare-pred-selected {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.85rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.82rem;
    color: var(--text-primary);
}
.compare-pred-selected .file-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.compare-pred-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    background: rgba(96,165,250,0.06);
    border: 1px solid rgba(96,165,250,0.15);
    border-radius: var(--radius);
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}
.compare-pred-info svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    color: var(--primary);
}
.compare-pred-error {
    padding: 0.5rem 0.75rem;
    background: rgba(248,113,113,0.08);
    border: 1px solid rgba(248,113,113,0.2);
    border-radius: var(--radius);
    font-size: 0.8rem;
    color: #f87171;
    margin-bottom: 0.5rem;
}
.compare-pred-gap {
    background: rgba(251,191,36,0.08) !important;
}

/* Toggle bar for switching between two test sets */
.compare-pred-toggle-bar {
    display: flex;
    gap: 0.2rem;
    background: var(--bg-body);
    border-radius: var(--radius);
    padding: 0.2rem;
    border: 1px solid var(--border-color);
    width: fit-content;
    margin: 0.75rem 0;
}
.compare-pred-toggle-btn {
    padding: 0.3rem 0.75rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: calc(var(--radius) - 2px);
    transition: all 0.15s;
    white-space: nowrap;
    max-width: 220px;
    overflow: hidden;
    text-overflow: ellipsis;
}
.compare-pred-toggle-btn:hover {
    color: var(--text-primary);
}
.compare-pred-toggle-btn.active {
    background: var(--primary);
    color: #fff;
}

/* Add second test set button */
.compare-pred-add-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 0.85rem;
    border: 1.5px dashed var(--border-color);
    border-radius: var(--radius);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 0.5rem;
}
.compare-pred-add-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(96,165,250,0.04);
}

/* Compact drop zone for second test set */
.compare-pred-drop--compact {
    padding: 1rem 1.5rem;
}
.compare-pred-drop--compact svg {
    width: 24px;
    height: 24px;
    margin-bottom: 0.25rem;
}

/* Active info bar highlight */
.compare-pred-info--active {
    border-color: var(--primary);
    background: rgba(96,165,250,0.1);
}

/* Stacked info bars spacing */
.compare-pred-info + .compare-pred-info {
    margin-top: 0.35rem;
}

/* Remove button for second test set */
.compare-pred-remove-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
    flex-shrink: 0;
    margin-left: auto;
    line-height: 1;
}
.compare-pred-remove-btn:hover {
    background: rgba(248,113,113,0.15);
    color: #f87171;
}

/* Slot label in info bar */
.compare-pred-slot-label {
    font-weight: 700;
    color: var(--text-muted);
    font-size: 0.72rem;
    flex-shrink: 0;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .upload-page--wide {
        max-width: 100%;
    }
    .compare-selection-bar {
        flex-wrap: wrap;
    }
    .compare-selection-bar .session-search {
        order: -1;
        width: 100%;
        flex: none;
        max-width: none;
    }
    .compare-table .col-label {
        width: 120px;
    }
    .compare-results-header {
        flex-wrap: wrap;
    }
}