/* ============================================
   Upload Page Styles
   ============================================ */

/* Upload page layout */
.upload-page {
    max-width: 700px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Hero section */
.upload-hero {
    text-align: center;
    margin-bottom: 2rem;
    padding: 2rem 0;
}
.upload-hero--compact {
    padding: 1rem 0;
    margin-bottom: 1.5rem;
}
.upload-hero-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}
.upload-hero-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Upload card */
.upload-card {
    padding: 2rem;
}

/* Prevent preview table from overflowing the page */
.upload-page .card {
    min-width: 0;
}
.upload-page .table-wrapper {
    overflow-x: auto;
}

/* Session resume card */
.session-resume-card {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--accent);
    border-radius: var(--radius-lg);
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.1);
}
.session-resume-card > .prev-session-synthesis {
    flex-basis: 100%;
    margin: 0 -1.25rem -1rem;
    padding: 0.65rem 1.25rem;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}
.session-resume-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(52, 211, 153, 0.15);
    border-radius: var(--radius);
    color: var(--accent);
}
.session-resume-icon svg {
    width: 22px;
    height: 22px;
}
.session-resume-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    min-width: 0;
}
.session-resume-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.session-resume-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.session-resume-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}

/* Upload zone */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s ease;
    background: var(--bg-body);
}
.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(96, 165, 250, 0.05);
    transform: translateY(-2px);
}
.upload-zone-icon {
    margin-bottom: 1rem;
}
.upload-zone-icon svg {
    width: 56px;
    height: 56px;
    color: var(--primary);
    stroke-width: 1.5;
}
.upload-zone.dragover .upload-zone-icon svg {
    animation: uploadBounce 0.5s ease infinite alternate;
}

@keyframes uploadBounce {
    from { transform: translateY(0); }
    to { transform: translateY(-8px); }
}

.upload-zone-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}
.upload-zone-text strong {
    color: var(--primary);
}

/* File selected zone (replaces drop zone) */
.file-selected-zone {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    border: 2px solid var(--accent);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    background: rgba(52, 211, 153, 0.04);
    animation: fadeInUp 0.3s ease;
}
.file-selected-zone.active {
    display: flex;
}
.file-selected-icon {
    width: 56px;
    height: 56px;
    color: var(--accent);
}
.file-selected-icon svg {
    width: 56px;
    height: 56px;
}
.file-selected-details {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
}
.file-selected-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.file-selected-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
}
.file-selected-size {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Format badges */
.format-badges {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.25rem;
}
.format-badge {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    transition: all 0.2s;
}
.format-badge svg {
    width: 14px;
    height: 14px;
    opacity: 0.7;
}
.upload-zone:hover .format-badge {
    border-color: var(--primary);
    color: var(--text-primary);
}

/* Upload progress bar */
.upload-progress {
    display: none;
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
    margin-top: 1rem;
    overflow: hidden;
}
.upload-progress.active {
    display: block;
}
.upload-progress-bar {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    transition: width 0.2s ease;
}

/* Upload submit button */
.upload-submit-btn {
    width: 100%;
    margin-top: 1.25rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    justify-content: center;
}
.upload-submit-btn svg {
    width: 20px;
    height: 20px;
}

/* Preview header */
.preview-header {
    margin-bottom: 1rem;
}
.preview-title-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.35rem;
}
.preview-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.preview-meta-sep {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--text-muted);
}

/* File extension badge */
.file-ext-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    vertical-align: middle;
}
.file-ext-badge--csv {
    background: rgba(52, 211, 153, 0.15);
    color: var(--accent);
}
.file-ext-badge--xlsx,
.file-ext-badge--xls {
    background: rgba(74, 222, 128, 0.15);
    color: #4ade80;
}
.file-ext-badge--parquet {
    background: rgba(167, 139, 250, 0.15);
    color: #a78bfa;
}

/* ============================================
   Previous sessions
   ============================================ */
.previous-sessions {
    margin-top: 2rem;
}
.previous-sessions-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}
.previous-sessions-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    white-space: nowrap;
}
.session-search {
    flex: 1;
    min-width: 0;
    max-width: 300px;
    padding: 0.35rem 0.65rem;
    font-size: 0.82rem;
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.2s;
}
.session-search:focus {
    border-color: var(--primary);
}
.session-search::placeholder {
    color: var(--text-muted);
}
.prev-session-item {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    padding: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.prev-session-item:hover {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(96, 165, 250, 0.1);
}
.prev-session-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
}
.prev-session-info {
    flex: 1;
    min-width: 0;
}
.prev-session-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.prev-session-name > span:first-child {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}
.prev-session-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 0.2rem;
}
.prev-session-models {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.1rem 0.45rem;
    background: rgba(96, 165, 250, 0.12);
    color: var(--primary);
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
}
.prev-session-actions {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
}
.prev-session-load {
    flex-shrink: 0;
}

/* ============================================
   Session groups (collapsible)
   ============================================ */
.session-group {
    margin-bottom: 0.25rem;
}
.session-group[open] {
    margin-bottom: 0.75rem;
}
.session-group-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    user-select: none;
    border-radius: var(--radius);
    background: rgba(148, 163, 184, 0.04);
    border: 1px solid transparent;
    transition: background 0.15s, border-color 0.15s;
}
.session-group-header:hover {
    background: rgba(148, 163, 184, 0.08);
    border-color: rgba(148, 163, 184, 0.1);
}
.session-group[open] > .session-group-header {
    background: transparent;
    border-color: transparent;
    padding: 0.4rem 0;
}
.session-group[open] > .session-group-header:hover {
    background: transparent;
}
.session-group-header::before {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 5px solid var(--text-secondary);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    transition: transform 0.2s;
    flex-shrink: 0;
}
.session-group[open] > .session-group-header::before {
    transform: rotate(90deg);
}
.session-group-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}
.session-group-count {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.1rem 0.45rem;
    background: rgba(167, 139, 250, 0.12);
    color: #a78bfa;
    border-radius: 4px;
}
.session-group-body {
    padding-left: 0.5rem;
}

/* Drag handle */
.session-group-drag {
    cursor: grab;
    color: var(--text-secondary);
    opacity: 0.4;
    font-size: 0.85rem;
    padding: 0 0.15rem;
    margin-left: auto;
    transition: opacity 0.15s;
}
.session-group-header:hover .session-group-drag {
    opacity: 0.8;
}

/* Drag states */
.session-group.dragging {
    opacity: 0.4;
}
.session-group.drag-over {
    border-top: 2px solid #a78bfa;
}
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius);
    transition: background 0.15s, color 0.15s;
    flex-shrink: 0;
}
.btn-icon:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}
.prev-session-group-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.1rem 0.45rem;
    background: rgba(167, 139, 250, 0.12);
    color: #a78bfa;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
}

/* ============================================
   Session synthesis (expandable)
   ============================================ */
.prev-session-expand {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: transform 0.25s ease, color 0.15s, background 0.15s;
    user-select: none;
    flex-shrink: 0;
    border-radius: 50%;
}
.prev-session-expand:hover {
    color: var(--accent);
    background: rgba(99, 102, 241, 0.1);
}
.prev-session-expand.open {
    transform: rotate(90deg);
    color: var(--accent);
}
.prev-session-synthesis {
    border-top: 1px solid var(--border-color);
    padding: 0.65rem 1rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
    line-height: 1.55;
}
.synthesis-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 0.4rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.8rem;
}
.synthesis-header .synthesis-sep {
    color: var(--text-muted);
    font-weight: 400;
}
.synthesis-model-name {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.2rem;
}
.synthesis-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.35rem;
}
.synthesis-metric {
    display: inline-flex;
    align-items: baseline;
    gap: 0.2rem;
}
.synthesis-metric-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.72rem;
    text-transform: uppercase;
}
.synthesis-metric-value {
    color: var(--accent);
    font-weight: 600;
}
.synthesis-metric-std {
    color: var(--text-muted);
    font-size: 0.7rem;
}
.synthesis-features {
    margin-bottom: 0.35rem;
}
.synthesis-features-label {
    font-weight: 600;
    color: var(--text-primary);
}
.synthesis-test {
    border-top: 1px dashed var(--border-color);
    padding-top: 0.4rem;
    margin-top: 0.35rem;
}
.synthesis-test-header {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.15rem;
}
.synthesis-rows-detail {
    font-weight: 400;
    font-size: 0.72rem;
    color: var(--text-muted);
}
.synthesis-noml {
    color: var(--text-muted);
    font-style: italic;
}
.synthesis-spinner {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    padding: 0.25rem 0;
}
.synthesis-spinner::before {
    content: '';
    width: 14px;
    height: 14px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================================
   Column selection card
   ============================================ */
#columnSelectionCard .chip .col-type-badge {
    margin-left: 0.3rem;
    font-size: 0.55rem;
}
#columnSelectionCard .chip-grid {
    max-height: min(400px, 50vh);
    overflow-y: auto;
}
#columnSelectionCard .col-sel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}
#columnSelectionCard .col-sel-count {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}
#columnSelectionCard .col-sel-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}
#columnSelectionCard .col-sel-toolbar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}
#columnSelectionCard .col-sel-toolbar .feature-search-wrapper {
    flex: 1;
    margin-bottom: 0;
}
#columnSelectionCard .col-sel-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-top: 1rem;
}
#columnSelectionCard .col-sel-actions .btn-primary {
    flex: 1;
}
#columnSelectionCard .col-sel-actions .btn-link {
    flex-shrink: 0;
}

/* Type bar + Paste modal styles moved to components.css */

/* ============================================
   Responsive upload
   ============================================ */
@media (max-width: 600px) {
    .upload-page {
        padding: 1rem;
    }
    .upload-hero-title {
        font-size: 1.5rem;
    }
    .session-resume-card {
        flex-direction: column;
        text-align: center;
        gap: 0.75rem;
    }
    .session-resume-content {
        align-items: center;
    }
    .session-resume-actions {
        width: 100%;
        flex-direction: column;
    }
    .session-resume-actions .btn {
        width: 100%;
        justify-content: center;
    }
    .format-badges {
        flex-wrap: wrap;
    }
    .preview-title-row {
        flex-wrap: wrap;
    }
    .prev-session-header {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    .prev-session-actions {
        width: 100%;
        flex-direction: column;
    }
    .prev-session-actions .btn {
        width: 100%;
        justify-content: center;
    }
    .prev-session-load {
        width: 100%;
        justify-content: center;
    }
}