/* ============================================
   Data Grid
   ============================================ */
.data-grid,
.results-grid {
    flex: 1;
    overflow: auto;
    position: relative;
    background-color: var(--color-bg);
}

.grid-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    font-family: var(--font-mono);
}

/* ============================================
   Grid Header
   ============================================ */
.grid-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background-color: var(--color-bg-alt);
    border-bottom: 2px solid var(--color-border);
}

.grid-header th {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    color: var(--color-text);
    background-color: var(--color-bg-alt);
    border-right: 1px solid var(--color-border);
    white-space: nowrap;
    user-select: none;
    cursor: pointer;
}

.grid-header th:last-child {
    border-right: none;
}

.grid-header th:hover {
    background-color: #e2e8f0;
}

.grid-header th.sortable:after {
    content: ' ↕';
    color: var(--color-text-muted);
    font-size: 10px;
    margin-left: var(--space-xs);
}

.grid-header th.sorted-asc:after {
    content: ' ↑';
    color: var(--color-primary);
}

.grid-header th.sorted-desc:after {
    content: ' ↓';
    color: var(--color-primary);
}

/* ============================================
   Grid Body
   ============================================ */
.grid-body {
    position: relative;
}

.grid-body tr {
    border-bottom: 1px solid var(--color-border);
}

.grid-body tr:nth-child(even) {
    background-color: var(--color-bg-alt);
}

.grid-body tr:hover {
    background-color: #f1f5f9;
}

.grid-body td {
    padding: var(--space-sm) var(--space-md);
    border-right: 1px solid var(--color-border);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.grid-body td:last-child {
    border-right: none;
}

/* ============================================
   Cell Types
   ============================================ */
.cell-number {
    text-align: right;
    font-family: var(--font-mono);
}

.cell-null {
    color: var(--color-text-muted);
    font-style: italic;
}

.cell-error {
    color: var(--color-danger);
    font-weight: 500;
}

.cell-warning {
    background-color: #fef3c7;
    color: var(--color-warning);
}

.cell-highlight {
    background-color: #dbeafe;
    font-weight: 500;
}

.cell-changed {
    background-color: #dcfce7;
    position: relative;
}

.cell-changed:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--color-success);
}

/* ============================================
   Row States
   ============================================ */
.row-duplicate {
    background-color: #fef3c7 !important;
}

.row-error {
    background-color: #fee2e2 !important;
}

.row-selected {
    background-color: #dbeafe !important;
}

.row-index {
    color: var(--color-text-muted);
    font-size: 11px;
    width: 50px;
    text-align: right;
    font-weight: 400;
    background-color: var(--color-bg-alt);
    border-right: 2px solid var(--color-border);
    user-select: none;
}

/* ============================================
   Virtual Scroll Container
   ============================================ */
.grid-viewport {
    position: relative;
    overflow-y: auto;
    overflow-x: auto;
    height: 100%;
}

.grid-spacer {
    /* Used for virtual scrolling - creates space for non-rendered rows */
    height: 0;
}

/* ============================================
   Grid Actions
   ============================================ */
.grid-actions {
    display: flex;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background-color: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    align-items: center;
}

.grid-info {
    flex: 1;
    font-size: 12px;
    color: var(--color-text-muted);
}

.grid-info strong {
    color: var(--color-text);
    font-weight: 600;
}

/* ============================================
   Column Resizing (future enhancement)
   ============================================ */
.column-resizer {
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    cursor: col-resize;
    user-select: none;
}

.column-resizer:hover {
    background-color: var(--color-primary);
}

/* ============================================
   Loading State
   ============================================ */
.grid-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    color: var(--color-text-muted);
}

.grid-loading:before {
    content: '⏳';
    font-size: 24px;
    margin-right: var(--space-sm);
    animation: spin 2s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ============================================
   Error State
   ============================================ */
.grid-error {
    padding: var(--space-xl);
    text-align: center;
    color: var(--color-danger);
}

.grid-error:before {
    content: '⚠️';
    font-size: 32px;
    display: block;
    margin-bottom: var(--space-md);
}

/* ============================================
   Compact Mode (for results)
   ============================================ */
.grid-compact .grid-table {
    font-size: 12px;
}

.grid-compact td,
.grid-compact th {
    padding: 4px var(--space-sm);
}

/* ============================================
   Zebra Striping Toggle
   ============================================ */
.grid-no-stripe .grid-body tr:nth-child(even) {
    background-color: var(--color-bg);
}

/* ============================================
   Scrollbar Styling (Webkit)
   ============================================ */
.data-grid::-webkit-scrollbar,
.results-grid::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

.data-grid::-webkit-scrollbar-track,
.results-grid::-webkit-scrollbar-track {
    background-color: var(--color-bg-alt);
}

.data-grid::-webkit-scrollbar-thumb,
.results-grid::-webkit-scrollbar-thumb {
    background-color: var(--color-border);
    border-radius: 6px;
}

.data-grid::-webkit-scrollbar-thumb:hover,
.results-grid::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-secondary);
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .grid-header {
        position: static;
    }
    
    .grid-body tr {
        page-break-inside: avoid;
    }
    
    .grid-actions,
    .empty-state {
        display: none;
    }
}