/* CSV Tools - Complete Styles with Light/Dark Theme Support */

/* ===== CSS Variables ===== */
.csv-tools-container {
    --csv-primary: var(--primary-color, #3498db);
    --csv-secondary: var(--secondary-color, #2ecc71);
    --csv-bg: var(--card-bg-color, #fcfcfc);
    --csv-surface: var(--background-color, #ffffff);
    --csv-text: var(--text-color, #333333);
    --csv-text-muted: #6c757d;
    --csv-border: var(--border-color, rgba(52, 152, 219, 0.1));
    --csv-shadow: var(--box-shadow, 0 4px 6px rgba(0, 0, 0, 0.1));
    --csv-radius: var(--border-radius-md, 8px);
    --csv-radius-lg: var(--border-radius-lg, 16px);
    --csv-transition: var(--transition-fast, 0.2s ease);
    --csv-gradient: linear-gradient(135deg, var(--csv-primary), var(--csv-secondary));
    --csv-success: #27ae60;
    --csv-warning: #f39c12;
    --csv-danger: #e74c3c;
    --csv-info: #3498db;
}

.dark-theme .csv-tools-container {
    --csv-text-muted: #9ca3af;
    --csv-surface: #1a1d24;
    --csv-bg: #242830;
}

/* ===== Base Container ===== */
.csv-tools-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem;
    font-family: var(--font-family, 'Inter', sans-serif);
    color: var(--csv-text);
}

/* ===== Header ===== */
.csv-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--secondary-rgb), 0.05));
    border-radius: 16px;
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.csv-header .header-content {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.csv-header .header-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    font-size: 1.75rem;
    color: white;
    box-shadow: 0 8px 24px rgba(var(--primary-rgb), 0.35);
}

.csv-header h2 {
    margin: 0 0 0.25rem 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--csv-text);
}

.csv-header p {
    margin: 0;
    opacity: 0.7;
    font-size: 0.9rem;
    color: var(--csv-text);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.csv-tools-container .btn-icon {
    width: 44px;
    height: 44px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--card-background);
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.csv-tools-container .btn-icon:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: rgba(var(--primary-rgb), 0.05);
}

.csv-tools-container .btn-icon:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== Privacy Notice ===== */
.privacy-notice {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: var(--csv-radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    background: linear-gradient(135deg, rgba(39, 174, 96, 0.1), rgba(52, 152, 219, 0.1));
    border: 1px solid rgba(39, 174, 96, 0.2);
    color: var(--csv-success);
}

.dark-theme .privacy-notice {
    background: rgba(39, 174, 96, 0.15);
}

/* ===== Controls ===== */
.csv-controls {
    margin-bottom: 1.5rem;
}

.primary-controls {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1.5rem;
    align-items: stretch;
}

.upload-zone {
    padding: 2rem;
    border: 2px dashed var(--csv-border);
    border-radius: var(--csv-radius-lg);
    background: var(--csv-bg);
    text-align: center;
    cursor: pointer;
    transition: var(--csv-transition);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--csv-primary);
    background: rgba(var(--primary-rgb), 0.05);
    transform: scale(1.01);
}

.upload-content i {
    font-size: 3rem;
    color: var(--csv-primary);
    margin-bottom: 1rem;
    display: block;
}

.upload-content h3 {
    margin: 0 0 0.5rem;
    font-size: 1.25rem;
    color: var(--csv-text);
}

.upload-content p {
    margin: 0 0 1rem;
    color: var(--csv-text-muted);
    font-size: 0.9rem;
}

.supported-formats {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.format-tag {
    padding: 0.25rem 0.75rem;
    background: rgba(var(--primary-rgb), 0.1);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--csv-primary);
    font-weight: 500;
}

.or-divider {
    display: flex;
    align-items: center;
    justify-content: center;
}

.or-divider span {
    padding: 0.5rem 1rem;
    background: var(--csv-bg);
    border-radius: 50%;
    color: var(--csv-text-muted);
    font-weight: 600;
    font-size: 0.9rem;
    border: 1px solid var(--csv-border);
}

.paste-area {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.paste-area textarea {
    flex: 1;
    min-height: 180px;
    padding: 1rem;
    border: 2px solid var(--csv-border);
    border-radius: var(--csv-radius);
    background: var(--csv-surface);
    color: var(--csv-text);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.85rem;
    resize: vertical;
}

.paste-area textarea:focus {
    outline: none;
    border-color: var(--csv-primary);
}

.paste-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== Buttons ===== */
.csv-tools-container .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--csv-radius);
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--csv-transition);
    text-decoration: none;
}

.csv-tools-container .btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.csv-tools-container .btn-primary {
    background: var(--csv-gradient);
    color: #fff !important;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.csv-tools-container .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.csv-tools-container .btn-outline {
    background: transparent;
    color: var(--csv-primary);
    border: 2px solid var(--csv-primary);
}

.csv-tools-container .btn-outline:hover {
    background: var(--csv-primary);
    color: #fff;
}

.csv-tools-container .btn-success {
    background: var(--csv-success);
    color: #fff;
}

.csv-tools-container .btn-danger {
    background: var(--csv-danger);
    color: #fff;
}

/* ===== Processing Indicator ===== */
.processing-indicator {
    background: var(--csv-bg);
    border-radius: var(--csv-radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--csv-border);
}

.processing-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.processing-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--csv-text);
}

.processing-percent {
    font-weight: 700;
    color: var(--csv-primary);
}

.progress-bar-container {
    height: 8px;
    background: var(--csv-border);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-bar {
    height: 100%;
    background: var(--csv-gradient);
    width: 0%;
    transition: width 0.3s ease;
}

.processing-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--csv-text-muted);
}

.processing-stats span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ===== File Info Banner ===== */
.file-info-banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--secondary-rgb), 0.05));
    border-radius: var(--csv-radius);
    margin-bottom: 1.5rem;
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    flex-wrap: wrap;
    gap: 1rem;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    color: var(--csv-text);
}

.file-info i {
    color: var(--csv-primary);
}

.file-info .separator {
    color: var(--csv-text-muted);
}

.file-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== Stats Dashboard ===== */
.stats-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: var(--csv-bg);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    transition: var(--csv-transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--csv-shadow);
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: #fff;
    background: var(--csv-gradient);
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--csv-text);
}

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

/* ===== Tool Tabs ===== */
.tool-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.5rem;
    background: var(--csv-bg);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    overflow-x: auto;
}

.tool-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: none;
    background: transparent;
    color: var(--csv-text-muted);
    border-radius: var(--csv-radius);
    cursor: pointer;
    font-weight: 500;
    transition: var(--csv-transition);
    white-space: nowrap;
}

.tool-tab:hover {
    background: var(--csv-surface);
    color: var(--csv-text);
}

.tool-tab.active {
    background: var(--csv-gradient);
    color: #fff;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
}

/* ===== Tool Panels ===== */
.tool-panel {
    display: none;
    background: var(--csv-bg);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    padding: 1.5rem;
}

.tool-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.panel-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 1.25rem;
    color: var(--csv-text);
}

.panel-description {
    margin: 0 0 1rem;
    color: var(--csv-text-muted);
    font-size: 0.9rem;
}

/* ===== CSV Table ===== */
.table-container {
    overflow-x: auto;
    margin-bottom: 1rem;
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    max-height: 500px;
    overflow-y: auto;
}

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

.csv-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
}

.csv-table th {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15), rgba(var(--primary-rgb), 0.1));
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--csv-text);
    border-bottom: 2px solid var(--csv-primary);
    white-space: nowrap;
    cursor: pointer;
    user-select: none;
}

.csv-table th:hover {
    background: rgba(var(--primary-rgb), 0.2);
}

.csv-table th.sortable::after {
    content: '↕';
    margin-left: 0.5rem;
    opacity: 0.4;
}

.csv-table th.sorted-asc::after {
    content: '↑';
    opacity: 1;
    color: var(--csv-primary);
}

.csv-table th.sorted-desc::after {
    content: '↓';
    opacity: 1;
    color: var(--csv-primary);
}

.csv-table td {
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--csv-border);
    color: var(--csv-text);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.csv-table.wrap-text td {
    white-space: normal;
    word-wrap: break-word;
}

.csv-table tbody tr:hover {
    background: rgba(var(--primary-rgb), 0.05);
}

.csv-table tbody tr.selected {
    background: rgba(var(--primary-rgb), 0.15);
}

.csv-table tbody tr.error-row {
    background: rgba(231, 76, 60, 0.1);
}

.csv-table tbody tr.warning-row {
    background: rgba(243, 156, 18, 0.1);
}

.csv-table .row-number {
    color: var(--csv-text-muted);
    font-size: 0.75rem;
    min-width: 50px;
    background: rgba(var(--primary-rgb), 0.03);
}

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

.csv-table .cell-highlight {
    background: rgba(243, 156, 18, 0.3);
}

/* ===== Viewer Controls ===== */
.view-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

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

.page-info {
    padding: 0 0.75rem;
    font-size: 0.9rem;
    color: var(--csv-text-muted);
}

.view-options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.viewer-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: rgba(var(--primary-rgb), 0.03);
    border-radius: var(--csv-radius);
    flex-wrap: wrap;
    gap: 0.5rem;
}

.viewer-footer #selection-info {
    color: var(--csv-text-muted);
    font-size: 0.9rem;
}

.quick-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== Validation Panel ===== */
.validation-options {
    margin-bottom: 1.5rem;
}

.validation-options h4 {
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--csv-text);
}

.check-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 0.75rem;
}

.validation-results {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--csv-border);
}

.validation-summary {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.summary-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--csv-radius);
    font-weight: 600;
}

.summary-item.valid {
    background: rgba(39, 174, 96, 0.1);
    color: var(--csv-success);
}

.summary-item.warning {
    background: rgba(243, 156, 18, 0.1);
    color: var(--csv-warning);
}

.summary-item.error {
    background: rgba(231, 76, 60, 0.1);
    color: var(--csv-danger);
}

.issues-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 400px;
    overflow-y: auto;
}

.issue-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border-left: 3px solid;
}

.issue-item.error {
    border-left-color: var(--csv-danger);
}

.issue-item.warning {
    border-left-color: var(--csv-warning);
}

.issue-item.info {
    border-left-color: var(--csv-info);
}

.issue-content {
    flex: 1;
}

.issue-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--csv-text);
}

.issue-description {
    font-size: 0.85rem;
    color: var(--csv-text-muted);
}

.issue-location {
    font-size: 0.8rem;
    color: var(--csv-primary);
    cursor: pointer;
}

/* ===== Columns Panel ===== */
.columns-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    max-height: 400px;
    overflow-y: auto;
}

.column-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    cursor: grab;
    transition: var(--csv-transition);
}

.column-item:hover {
    border-color: var(--csv-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.column-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.column-item .drag-handle {
    color: var(--csv-text-muted);
    cursor: grab;
}

.column-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--csv-primary);
}

.column-item .column-name-input {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid transparent;
    border-radius: 4px;
    background: transparent;
    color: var(--csv-text);
    font-weight: 500;
}

.column-item .column-name-input:focus {
    border-color: var(--csv-primary);
    background: var(--csv-bg);
}

.column-item .column-type {
    padding: 0.25rem 0.5rem;
    background: rgba(var(--primary-rgb), 0.1);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--csv-primary);
}

.column-item .delete-column {
    color: var(--csv-text-muted);
    cursor: pointer;
    padding: 0.25rem;
    transition: var(--csv-transition);
}

.column-item .delete-column:hover {
    color: var(--csv-danger);
}

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

.add-column-section {
    padding-top: 1.5rem;
    border-top: 1px solid var(--csv-border);
}

.add-column-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--csv-text);
}

.add-column-form {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.add-column-form input,
.add-column-form select {
    flex: 1;
    min-width: 150px;
    padding: 0.75rem 1rem;
    border: 1px solid var(--csv-border);
    border-radius: var(--csv-radius);
    background: var(--csv-surface);
    color: var(--csv-text);
}

/* ===== Filter & Search Panel ===== */
.filter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.search-card,
.filter-card {
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    padding: 1.25rem;
}

.search-card h4,
.filter-card h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--csv-text);
}

.search-input-wrapper {
    position: relative;
    margin-bottom: 1rem;
}

.search-input-wrapper input {
    width: 100%;
    padding: 0.75rem 1rem;
    padding-right: 100px;
    border: 2px solid var(--csv-border);
    border-radius: var(--csv-radius);
    background: var(--csv-bg);
    color: var(--csv-text);
    font-size: 1rem;
}

.search-input-wrapper input:focus {
    outline: none;
    border-color: var(--csv-primary);
}

.search-count {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.8rem;
    color: var(--csv-text-muted);
    background: var(--csv-bg);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.search-options {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--csv-text);
}

.checkbox-option input {
    width: 18px;
    height: 18px;
    accent-color: var(--csv-primary);
}

.filter-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.filter-select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--csv-border);
    border-radius: var(--csv-radius);
    background: var(--csv-surface);
    color: var(--csv-text);
    font-size: 0.9rem;
}

.filter-value-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.filter-value-row input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--csv-border);
    border-radius: var(--csv-radius);
    background: var(--csv-surface);
    color: var(--csv-text);
}

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

.active-filters {
    margin-bottom: 1.5rem;
}

.active-filters h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 0.75rem;
    font-size: 0.9rem;
    color: var(--csv-text);
}

.filters-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-tag {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: rgba(var(--primary-rgb), 0.1);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--csv-primary);
}

.filter-tag .remove-filter {
    cursor: pointer;
    opacity: 0.7;
}

.filter-tag .remove-filter:hover {
    opacity: 1;
}

.filter-results {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: var(--csv-radius);
    flex-wrap: wrap;
}

.results-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--csv-text);
    font-size: 0.9rem;
}

/* ===== Sort Panel ===== */
.sort-container {
    margin-bottom: 1.5rem;
}

.sort-rules {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.sort-rule {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.sort-rule select {
    flex: 1;
    min-width: 150px;
}

.sort-actions {
    display: flex;
    gap: 0.5rem;
}

/* ===== Cleaner Panel ===== */
.clean-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.clean-card {
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    padding: 1.25rem;
}

.clean-card h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--csv-text);
}

.clean-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.select-column-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--csv-text);
}

.missing-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.replace-form {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.replace-form input {
    padding: 0.75rem 1rem;
    border: 1px solid var(--csv-border);
    border-radius: var(--csv-radius);
    background: var(--csv-surface);
    color: var(--csv-text);
}

.replace-options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

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

/* ===== Merge Panel ===== */
.merge-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.merge-files {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.merge-file-card {
    flex: 1;
    min-width: 250px;
    padding: 1.5rem;
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    text-align: center;
}

.merge-file-card h4 {
    margin: 0 0 0.75rem;
    font-size: 0.9rem;
    color: var(--csv-text-muted);
}

.file-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(var(--primary-rgb), 0.1);
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--csv-primary);
}

.merge-plus {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--csv-gradient);
    border-radius: 50%;
    color: #fff;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.merge-upload-zone {
    padding: 2rem;
    border: 2px dashed var(--csv-border);
    border-radius: var(--csv-radius);
    cursor: pointer;
    transition: var(--csv-transition);
}

.merge-upload-zone:hover {
    border-color: var(--csv-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.merge-upload-zone i {
    font-size: 2rem;
    color: var(--csv-primary);
    margin-bottom: 0.5rem;
    display: block;
}

.merge-upload-zone span {
    color: var(--csv-text-muted);
    font-size: 0.9rem;
}

.merge-options h4 {
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--csv-text);
}

.merge-type-selector {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.merge-type-option {
    flex: 1;
    min-width: 200px;
}

.merge-type-option input {
    display: none;
}

.type-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 2px solid var(--csv-border);
    cursor: pointer;
    transition: var(--csv-transition);
    text-align: center;
}

.type-card i {
    font-size: 2rem;
    color: var(--csv-primary);
}

.type-card span {
    font-weight: 600;
    color: var(--csv-text);
}

.type-card small {
    color: var(--csv-text-muted);
    font-size: 0.8rem;
}

.merge-type-option input:checked+.type-card {
    border-color: var(--csv-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.join-options {
    padding: 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: var(--csv-radius);
    margin-bottom: 1rem;
}

.join-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.join-row select {
    flex: 1;
    min-width: 150px;
}

/* ===== Split Panel ===== */
.split-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.split-options {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.split-option {
    flex: 1;
    min-width: 150px;
}

.split-option input {
    display: none;
}

.option-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 2px solid var(--csv-border);
    cursor: pointer;
    transition: var(--csv-transition);
    text-align: center;
}

.option-card i {
    font-size: 1.5rem;
    color: var(--csv-primary);
}

.option-card span {
    font-weight: 500;
    color: var(--csv-text);
    font-size: 0.9rem;
}

.split-option input:checked+.option-card {
    border-color: var(--csv-primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.split-config {
    padding: 1.5rem;
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
}

.split-config>div {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.split-config label {
    font-weight: 500;
    color: var(--csv-text);
    min-width: 120px;
}

.split-config input,
.split-config select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--csv-border);
    border-radius: var(--csv-radius);
    background: var(--csv-bg);
    color: var(--csv-text);
}

.split-preview {
    padding: 1rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: var(--csv-radius);
}

.split-preview h4 {
    margin: 0 0 0.5rem;
    font-size: 0.9rem;
    color: var(--csv-text);
}

/* ===== Convert Panel ===== */
.convert-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.convert-section {
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    padding: 1.25rem;
}

.convert-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--csv-text);
}

.format-buttons,
.delimiter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.format-btn,
.delimiter-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: var(--csv-bg);
    border: 2px solid var(--csv-border);
    border-radius: var(--csv-radius);
    cursor: pointer;
    transition: var(--csv-transition);
    color: var(--csv-text);
}

.format-btn i {
    font-size: 1.5rem;
    color: var(--csv-primary);
}

.format-btn:hover,
.delimiter-btn:hover {
    border-color: var(--csv-primary);
}

.format-btn.active,
.delimiter-btn.active {
    border-color: var(--csv-primary);
    background: rgba(var(--primary-rgb), 0.1);
}

.export-options {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.encoding-select {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sql-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.convert-preview {
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    padding: 1.25rem;
}

.convert-preview h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--csv-text);
}

.convert-preview pre {
    background: var(--csv-bg);
    padding: 1rem;
    border-radius: var(--csv-radius);
    overflow-x: auto;
    max-height: 300px;
    font-size: 0.85rem;
    color: var(--csv-text);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
}

.convert-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
}

/* ===== Statistics Panel ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.stats-card {
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    overflow: hidden;
}

.stats-card.full-width {
    grid-column: 1 / -1;
}

.stats-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: rgba(var(--primary-rgb), 0.05);
    border-bottom: 1px solid var(--csv-border);
}

.stats-card .card-header h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    font-size: 1rem;
    color: var(--csv-text);
}

.stats-card .card-body {
    padding: 1.25rem;
}

.numeric-stats,
.column-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-row,
.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--csv-border);
}

.stat-row:last-child,
.info-row:last-child {
    border-bottom: none;
}

.stat-row .label,
.info-row .label {
    color: var(--csv-text-muted);
}

.stat-row .value,
.info-row .value {
    font-weight: 600;
    color: var(--csv-text);
}

.frequency-chart {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 300px;
    overflow-y: auto;
}

.freq-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.freq-label {
    min-width: 100px;
    font-size: 0.85rem;
    color: var(--csv-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.freq-bar {
    flex: 1;
    height: 20px;
    background: var(--csv-border);
    border-radius: 4px;
    overflow: hidden;
}

.freq-bar-fill {
    height: 100%;
    background: var(--csv-gradient);
    transition: width 0.3s ease;
}

.freq-count {
    min-width: 40px;
    text-align: right;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--csv-text);
}

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

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

.summary-table th {
    font-weight: 600;
    color: var(--csv-text);
    background: rgba(var(--primary-rgb), 0.05);
}

.summary-table td {
    color: var(--csv-text);
}

/* ===== Learn Panel ===== */
.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.learn-card {
    background: var(--csv-surface);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    padding: 1.5rem;
}

.learn-card.full-width {
    grid-column: 1 / -1;
}

.learn-card h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 1rem;
    font-size: 1.1rem;
    color: var(--csv-text);
}

.learn-card p {
    margin: 0 0 1rem;
    line-height: 1.6;
    color: var(--csv-text);
}

.code-example {
    background: var(--csv-bg);
    padding: 1rem;
    border-radius: var(--csv-radius);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.85rem;
    overflow-x: auto;
    color: var(--csv-text);
    margin: 0;
}

.issue-list,
.tips-list {
    margin: 0;
    padding-left: 1.5rem;
}

.issue-list li,
.tips-list li {
    margin-bottom: 0.5rem;
    color: var(--csv-text);
    line-height: 1.5;
}

.sample-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.sample-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ===== Export Bar ===== */
.export-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--csv-bg);
    border-radius: var(--csv-radius);
    border: 1px solid var(--csv-border);
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.export-label {
    font-weight: 600;
    color: var(--csv-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.export-bar .btn {
    background: var(--csv-surface);
    color: var(--csv-text);
    border: 1px solid var(--csv-border);
}

.export-bar .btn:hover {
    background: var(--csv-primary);
    color: #fff;
    border-color: var(--csv-primary);
}

/* ===== Modals ===== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--csv-bg);
    border-radius: var(--csv-radius-lg);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--csv-border);
}

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    color: var(--csv-text);
}

.close-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--csv-surface);
    border-radius: 50%;
    cursor: pointer;
    color: var(--csv-text);
    transition: var(--csv-transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: var(--csv-danger);
    color: #fff;
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--csv-border);
}

.help-section {
    margin-bottom: 1.5rem;
}

.help-section h4 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0 0 0.75rem;
    color: var(--csv-text);
}

.help-section p {
    margin: 0;
    line-height: 1.6;
    color: var(--csv-text);
}

.shortcuts-list {
    margin: 0;
    padding-left: 1.5rem;
}

.shortcuts-list li {
    margin-bottom: 0.5rem;
    color: var(--csv-text);
}

.shortcuts-list kbd {
    background: var(--csv-surface);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    border: 1px solid var(--csv-border);
    font-family: monospace;
    font-size: 0.85rem;
}

.settings-group {
    margin-bottom: 1rem;
}

.settings-group>label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--csv-text);
}

.settings-group select {
    width: 100%;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .primary-controls {
        grid-template-columns: 1fr;
    }

    .or-divider {
        padding: 1rem 0;
    }

    .or-divider span {
        border-radius: var(--csv-radius);
        padding: 0.5rem 2rem;
    }

    .stats-grid,
    .clean-grid,
    .filter-grid,
    .learn-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .csv-tools-container {
        padding: 1rem;
    }

    .csv-header {
        padding: 1rem;
    }

    .csv-header .header-icon {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
    }

    .csv-header h2 {
        font-size: 1.25rem;
    }

    .tool-tabs {
        padding: 0.25rem;
    }

    .tool-tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .tool-tab span {
        display: none;
    }

    .stats-dashboard {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-card {
        padding: 1rem;
    }

    .stat-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .file-info-banner {
        flex-direction: column;
        text-align: center;
    }

    .panel-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .view-controls {
        flex-direction: column;
        align-items: flex-start;
    }

    .merge-files {
        flex-direction: column;
    }

    .merge-plus {
        transform: rotate(90deg);
    }

    .split-options {
        flex-direction: column;
    }

    .csv-table th,
    .csv-table td {
        padding: 0.5rem;
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .stats-dashboard {
        grid-template-columns: 1fr;
    }

    .tool-tab i {
        font-size: 1.25rem;
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .format-buttons {
        justify-content: center;
    }

    .format-btn {
        flex: 1;
        min-width: 80px;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(20px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.tool-panel.active {
    animation: fadeIn 0.3s ease;
}

.stat-card {
    animation: slideIn 0.3s ease backwards;
}

.stat-card:nth-child(1) {
    animation-delay: 0.05s;
}

.stat-card:nth-child(2) {
    animation-delay: 0.1s;
}

.stat-card:nth-child(3) {
    animation-delay: 0.15s;
}

.stat-card:nth-child(4) {
    animation-delay: 0.2s;
}

.stat-card:nth-child(5) {
    animation-delay: 0.25s;
}

.stat-card:nth-child(6) {
    animation-delay: 0.3s;
}

/* ===== Scrollbar Styling ===== */
.csv-tools-container ::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.csv-tools-container ::-webkit-scrollbar-track {
    background: var(--csv-surface);
    border-radius: 4px;
}

.csv-tools-container ::-webkit-scrollbar-thumb {
    background: var(--csv-primary);
    border-radius: 4px;
}

.csv-tools-container ::-webkit-scrollbar-thumb:hover {
    background: var(--csv-secondary);
}

/* ===== Toast Notifications ===== */
.csv-toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background: var(--csv-bg);
    border-radius: var(--csv-radius);
    border-left: 4px solid var(--csv-primary);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    z-index: 1001;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideInRight 0.3s ease;
}

.csv-toast.success {
    border-left-color: var(--csv-success);
}

.csv-toast.error {
    border-left-color: var(--csv-danger);
}

.csv-toast.warning {
    border-left-color: var(--csv-warning);
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===== Loading States ===== */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(var(--primary-rgb), 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.skeleton {
    background: linear-gradient(90deg, var(--csv-border) 25%, var(--csv-surface) 50%, var(--csv-border) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--csv-text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h4 {
    margin: 0 0 0.5rem;
    color: var(--csv-text);
}

.empty-state p {
    margin: 0;
}