/* DocuFlow Table Viewer Styles */

.table-viewer {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0; /* Critical for flex children */
    overflow: hidden;
    background: var(--surface);
}

/* Toolbar */
.table-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface-alt);
    flex-wrap: wrap;
    gap: 0.5rem;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toolbar-btn {
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toolbar-btn:hover {
    background: var(--primary-dark);
}

.toolbar-select {
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    background: var(--background);
    color: var(--text-primary);
    cursor: pointer;
}

/* Table Stats */
.table-stats {
    padding: 0.75rem 1rem;
    background: var(--background);
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.changes-indicator {
    padding: 0.25rem 0.5rem;
    background: var(--warning-bg);
    color: var(--warning-text);
    border-radius: 4px;
    font-weight: 500;
}

/* Table Container */
.table-container {
    flex: 1;
    overflow: auto;
    padding: 1rem;
}

/* Data Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    font-size: 0.875rem;
}

.data-table thead {
    position: sticky;
    top: 0;
    background: var(--surface-alt);
    z-index: 10;
}

.data-table th {
    padding: 0.75rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border: 1px solid var(--border);
    background: var(--surface-alt);
}

.data-table th.sortable {
    cursor: pointer;
    user-select: none;
    transition: background 0.2s;
}

.data-table th.sortable:hover {
    background: var(--surface-hover);
}

.row-select-th,
.row-select-td {
    width: 40px;
    text-align: center;
}

.row-number-th,
.row-number {
    width: 60px;
    text-align: center;
    font-weight: 500;
    color: var(--text-secondary);
}

.data-table td {
    padding: 0.75rem;
    border: 1px solid var(--border);
    color: var(--text-primary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.data-table tbody tr:hover {
    background: var(--surface-hover);
}

.data-cell.editable {
    cursor: text;
    background: var(--warning-bg);
}

.data-cell.editable:focus {
    outline: 2px solid var(--primary);
    background: var(--surface);
    white-space: normal;
}

.data-cell.changed {
    background: var(--warning-bg);
    border-color: var(--warning);
    font-weight: 500;
}

/* JSON/Object cells - special styling for nested tables */
.data-cell[data-column-type="object"] {
    font-size: 0.9rem;
    max-width: 600px;
    overflow-x: auto;
    overflow-y: hidden;
    word-break: break-word;
    white-space: normal;
    line-height: 1.4;
    padding: 8px;
}

.data-cell[data-column-type="object"]:hover {
    overflow: visible;
    z-index: 10;
    position: relative;
    box-shadow: 0 4px 12px var(--shadow-lg);
    background: var(--surface);
}

/* Nested tables within cells */
.nested-table {
    background: var(--surface);
    font-size: 0.85rem;
    border: 1px solid var(--border) !important;
    border-radius: 4px;
    overflow: hidden;
}

.nested-table th {
    background: var(--surface-alt) !important;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    white-space: nowrap;
}

.nested-table td {
    vertical-align: top;
}

.nested-table td,
.nested-table th {
    padding: 6px 8px !important;
    border: 1px solid var(--border) !important;
}

/* Nested tables hover effect */
.nested-table tbody tr:hover {
    background: var(--surface-hover);
}

/* Limit nesting depth for readability */
.nested-table .nested-table {
    font-size: 0.8rem;
    margin: 4px 0;
}

.nested-table .nested-table .nested-table {
    font-size: 0.75rem;
    margin: 2px 0;
}

/* Lists within cells */
.data-cell ul {
    margin: 0;
    padding-left: 18px;
    list-style-type: disc;
}

.data-cell ul li {
    margin: 2px 0;
}

/* Checkbox Styling */
.data-table input[type="checkbox"] {
    cursor: pointer;
    width: 16px;
    height: 16px;
}

/* Empty State */
.table-empty {
    padding: 3rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Scrollbar styles moved to scrollbars.css (Phase 15) */

/* === NEW: Excel Sheet Tabs === */
.sheet-tabs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--surface-alt);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
}

.sheet-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px 6px 0 0;
    color: var(--text);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.sheet-tab:hover {
    background: var(--surface-hover);
    border-color: var(--primary);
}

.sheet-tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    font-weight: 600;
}

.sheet-tab i {
    font-size: 0.875rem;
}

/* === NEW: Column Type Icons === */
.column-header-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: space-between;
    width: 100%;
}

.type-icon {
    font-size: 0.875rem;
    opacity: 0.6;
    flex-shrink: 0;
}

.column-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sort-indicator {
    font-size: 0.75rem;
    opacity: 0.5;
    flex-shrink: 0;
}

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

th.sortable:hover {
    background: var(--surface-hover);
}

th.sortable:hover .sort-indicator {
    opacity: 1;
}

/* === NEW: Enhanced Stats Bar === */
.table-stats {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--surface-alt);
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.table-stats strong {
    color: var(--primary);
    font-weight: 600;
}

.changes-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.25rem 0.75rem;
    background: var(--warning-bg);
    color: var(--warning-text);
    border-radius: 4px;
    font-weight: 500;
}

/* === Filters Panel - Additional Styles === */
.filters-panel.active {
    max-height: 60vh; /* Limit height on mobile */
}

.filters-panel-content {
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

/* Scrollbar styles moved to scrollbars.css (Phase 15) */

.filter-item {
    position: relative;
}

.filter-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary);
    border-radius: 6px 0 0 6px;
}

/* Responsive */
@media (max-width: 768px) {
    .table-toolbar {
        flex-direction: column;
        align-items: stretch;
    }

    .toolbar-group {
        flex-wrap: wrap;
    }

    .data-table {
        font-size: 0.75rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.5rem;
    }

    .sheet-tabs {
        overflow-x: scroll;
    }

    .column-header-content {
        font-size: 0.75rem;
    }

    /* Filters Panel - Mobile */
    .filters-panel.active {
        max-height: 50vh;
    }

    .filters-panel-header {
        padding: 0.5rem;
        margin: 0 0.5rem;
    }

    .filters-panel-content {
        padding: 0.75rem;
        max-height: 40vh;
    }

    .filter-item {
        padding: 0.5rem;
    }

    .filter-item-header {
        flex-wrap: wrap;
        gap: 0.25rem;
    }

    .filter-column-name {
        font-size: 0.75rem;
    }

    .filters-group-header {
        font-size: 0.75rem;
    }

    .filters-search-wrapper {
        margin-bottom: 0.75rem;
    }

    .filters-column-search-input {
        font-size: 0.75rem;
        padding: 0.375rem 0.5rem 0.375rem 2rem;
    }
}

/* === ETAP 2: Column Manager Panel (Realtime Toggle) === */
.column-manager-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    background: var(--surface-alt);
    border-bottom: 1px solid var(--border);
}

.column-manager-panel.active {
    max-height: 400px;
    padding: 1rem 0;
}

.column-manager-header {
    padding: 0 1rem 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    margin: 0 1rem;
}

.panel-title {
    font-weight: 600;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text);
}

.btn-reset {
    padding: 0.5rem 0.75rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
}

.btn-reset:hover {
    background: var(--error);
    color: var(--text-inverse);
    border-color: var(--error);
}

.column-manager-scroll {
    overflow-x: auto;
    padding: 1rem;
    display: flex;
    gap: 1rem;
}

/* Column Manager Grid - Horizontal */
.column-manager-grid {
    display: flex;
    gap: 1rem;
    min-width: min-content;
}

.column-item {
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 220px;
    max-width: 220px;
    transition: all 0.2s;
    box-shadow: 0 1px 3px var(--shadow);
}

.column-item:hover {
    box-shadow: 0 2px 8px var(--shadow-md);
    border-color: var(--primary);
}

.column-item-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.column-position {
    font-weight: 700;
    color: var(--primary);
    min-width: 20px;
    font-size: 0.75rem;
    text-align: center;
    background: var(--primary);
    color: white;
    border-radius: 4px;
    padding: 0.125rem 0.375rem;
}

.column-visibility-toggle {
    cursor: pointer;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.column-name-input {
    flex: 1;
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--surface-alt);
}

.column-name-input:focus {
    outline: 2px solid var(--primary);
    border-color: var(--primary);
    background: var(--surface);
}

.column-item-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.column-type-select {
    flex: 1;
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.75rem;
    background: var(--surface);
    cursor: pointer;
}

.column-type-select:focus {
    outline: 2px solid var(--primary);
    border-color: var(--primary);
}

.column-reorder-buttons {
    display: flex;
    gap: 0.25rem;
}

.btn-icon {
    padding: 0.25rem;
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 0.75rem;
    color: var(--text-primary);
}

.btn-icon:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px var(--shadow-md);
}

.btn-icon:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    background: var(--surface-active);
    color: var(--text-disabled);
}

.column-item-info {
    font-size: 0.65rem;
    color: var(--text-secondary);
    padding-top: 0.25rem;
    border-top: 1px solid var(--border);
    text-align: center;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Active state for Columns button */
.toolbar-btn.active {
    background: var(--primary);
    color: white;
}

/* === ETAP 3: Search and Filters === */
.toolbar-search {
    flex: 1;
    max-width: 500px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    pointer-events: none;
}

.toolbar-search-input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2.25rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    transition: all 0.2s;
    background: var(--surface);
}

.toolbar-search-input:focus {
    outline: 2px solid var(--primary);
    border-color: var(--primary);
}

.btn-clear-filters {
    background: var(--text-secondary);
    color: white;
    border: none;
    white-space: nowrap;
}

.btn-clear-filters:hover {
    background: var(--text-muted);
}

/* === ETAP 3: Filters Panel === */
.filters-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    background: var(--surface-alt);
    border-bottom: 1px solid var(--border);
}

.filters-panel.active {
    max-height: 500px;
    padding: 1rem 0;
}

.filters-panel-header {
    padding: 0 1rem 0.75rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    margin: 0 1rem;
}

.filters-panel-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.filters-panel-content {
    padding: 1rem;
    max-height: 400px;
    overflow-y: auto;
}

.filters-search-wrapper {
    position: relative;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filters-search-wrapper i {
    position: absolute;
    left: 0.75rem;
    color: var(--text-secondary);
    pointer-events: none;
}

.filters-column-search-input {
    width: 100%;
    padding: 0.5rem 0.75rem 0.5rem 2.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    background: var(--surface);
    transition: all 0.2s;
}

.filters-column-search-input:focus {
    outline: 2px solid var(--primary);
    border-color: var(--primary);
}

.btn-clear-search {
    padding: 0.375rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-clear-search:hover {
    background: var(--error);
    color: white;
}

.filters-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.filters-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.filters-group-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.filters-group-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.filter-item {
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    transition: all 0.2s;
}

.filter-item:hover {
    border-color: var(--primary);
    box-shadow: 0 2px 4px var(--shadow);
}

.filter-item.active {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.filter-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.filter-column-name {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text);
}

.filter-column-label {
    flex: 1;
}

.filter-badge {
    padding: 0.125rem 0.5rem;
    background: var(--primary);
    color: white;
    border-radius: 12px;
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
}

.btn-clear-filter {
    padding: 0.25rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-clear-filter:hover {
    background: var(--error);
    color: white;
}

.filters-empty {
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
}

.filters-empty i {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    opacity: 0.5;
}

.filters-empty p {
    margin: 0;
    font-size: 0.875rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
    height: 20px;
    padding: 0 0.375rem;
    background: var(--primary);
    color: white;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

/* Filter row (deprecated - kept for backward compatibility) */
.filter-row th {
    padding: 0.25rem 0.5rem;
    background: var(--surface-alt);
    border-bottom: 2px solid var(--border);
}

.column-filter-input {
    width: 100%;
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.75rem;
    transition: all 0.2s;
    background: var(--surface);
}

.column-filter-input:focus {
    outline: 2px solid var(--primary);
    border-color: var(--primary);
}

.column-filter-input::placeholder {
    color: var(--text-disabled);
    font-style: italic;
}

/* Search highlight */
mark {
    background-color: var(--warning);
    color: var(--text-primary);
    font-weight: 600;
    padding: 0 2px;
    border-radius: 2px;
}

/* === ETAP 4: Formulas Panel === */
.formula-panel {
    background: var(--surface-alt);
    border-bottom: 1px solid var(--border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.formula-panel.active {
    max-height: 300px;
    overflow-y: auto;
}

.formula-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.formula-controls {
    padding: 1rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.formula-select {
    flex: 1;
    min-width: 200px;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    background: var(--surface);
}

.formula-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.formula-btn {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    color: var(--text);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.formula-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.formula-btn i {
    font-size: 0.875rem;
}

.formula-results {
    padding: 0 1rem 1rem 1rem;
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.no-formulas {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-style: italic;
    margin: 0;
}

.formula-result-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
}

.formula-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.formula-name {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.75rem;
    text-transform: uppercase;
}

.formula-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text);
}

.formula-remove-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: 4px;
    transition: all 0.2s;
}

.formula-remove-btn:hover {
    background: var(--error);
    color: white;
}

/* Formula sections */
.formula-section {
    width: 100%;
    margin-top: 0.5rem;
}

.formula-section-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text);
    margin-bottom: 0.5rem;
    padding: 0.25rem 0.5rem;
    background: var(--surface);
    border-left: 3px solid var(--primary);
    border-radius: 4px;
}

.formula-hint {
    background: var(--warning-bg);
    border: 1px solid var(--warning);
    color: var(--warning-text);
    padding: 1rem;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.875rem;
    margin-top: 1rem;
}

.formula-hint i {
    font-size: 1.25rem;
    color: var(--warning);
}

/* ETAP 4: Formula cards with charts */
.formula-result-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px var(--shadow-sm);
    transition: box-shadow 0.2s ease;
}

.formula-result-card:hover {
    box-shadow: 0 4px 8px var(--shadow);
}

.formula-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.formula-chart-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    padding: 0.5rem;
    background: var(--background);
    border-radius: 6px;
}

.chart-type-btn {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.125rem;
}

.chart-type-btn:hover {
    background: var(--info-bg);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.chart-type-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 4px 8px var(--shadow-lg);
}

.formula-chart-container {
    margin-top: 0.75rem;
    padding: 1rem;
    background: var(--background);
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.formula-chart-container canvas {
    max-width: 100%;
    height: auto !important;
}

/* ETAP 4.5: Computed Column Panel */
.computed-column-panel {
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 8px var(--shadow);
}

.computed-column-panel.active {
    display: block;
}

.computed-column-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--primary);
}

.column-mode-toggle {
    display: flex;
    gap: 0.5rem;
}

.mode-btn {
    padding: 0.5rem 1rem;
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mode-btn:hover {
    background: var(--background);
    border-color: var(--primary);
    color: var(--primary);
}

.mode-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    box-shadow: 0 2px 4px rgba(26, 58, 82, 0.3);
}

.computed-column-form {
    background: var(--background);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.form-row {
    margin-bottom: 1rem;
}

.form-row label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    transition: border-color 0.2s ease;
}

.form-textarea {
    font-family: 'Courier New', monospace;
    resize: vertical;
    min-height: 80px;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--accent-alpha);
}

.btn-add-computed-column {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-add-computed-column:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-lg);
}

.computed-columns-list {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--background);
    border-radius: 6px;
}

.computed-column-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 0.5rem;
    transition: all 0.2s ease;
}

.computed-column-card:hover {
    box-shadow: 0 2px 4px var(--shadow);
    border-color: var(--primary);
}

.computed-col-info {
    flex: 1;
}

.btn-remove-computed-column {
    padding: 0.5rem;
    background: var(--error);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-remove-computed-column:hover {
    background: var(--error-hover);
    transform: scale(1.1);
}

/* ETAP 4.5: Regular Column Form */
.regular-column-form {
    background: var(--background);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}

.btn-add-regular-column {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--success);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-add-regular-column:hover {
    background: var(--success-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-lg);
}

/* ETAP 5: Cell-level formulas */
.data-cell.has-formula {
    position: relative;
    background: linear-gradient(135deg, #e3f2fd 0%, #ffffff 50%);
    border-left: 3px solid var(--accent);
}

.cell-formula-indicator {
    position: absolute;
    top: 2px;
    right: 2px;
    font-size: 0.65rem;
    color: var(--accent);
    opacity: 0.7;
    pointer-events: none;
}

.data-cell.has-formula:hover .cell-formula-indicator {
    opacity: 1;
}

.data-cell.editable:focus {
    background: var(--warning-bg);
    border: 2px solid var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-alpha);
}

/* ETAP 6: Validation */
.data-cell.has-error {
    position: relative;
    background: linear-gradient(135deg, #fee 0%, #fff 50%);
    border-left: 3px solid var(--error);
}

.cell-error-indicator {
    position: absolute;
    top: 2px;
    right: 2px;
    font-size: 0.7rem;
    color: #dc3545;
    opacity: 0.8;
    pointer-events: none;
}

.data-cell.has-error:hover .cell-error-indicator {
    opacity: 1;
}

.validation-panel {
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.validation-panel.active {
    display: block;
}

.validation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--primary);
}

.validation-error-count {
    color: #dc3545;
    font-weight: 600;
    font-size: 0.875rem;
}

.validation-success {
    color: var(--success);
    font-weight: 600;
    font-size: 0.875rem;
}

.validation-form {
    padding: 1rem;
    background: var(--background);
    border-radius: 6px;
    margin-bottom: 1rem;
}

.validation-rules-list {
    padding: 1rem;
    background: var(--background);
    border-radius: 6px;
}

.validation-rule-card {
    position: relative;
    padding: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.btn-remove-validation {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.25rem 0.5rem;
    background: var(--error);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.75rem;
}

.btn-remove-validation:hover {
    background: var(--error-hover);
}

.btn-add-validation-rule {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-add-validation-rule:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-lg);
}