/**
 * SKU & Barcode Manager Styles
 * Enterprise-Grade Styling
 * 
 * @version 1.0.0
 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #6c757d;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    
    --border-color: #e0e0e0;
    --border-radius: 8px;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.header {
    background: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.header h1 {
    font-size: 28px;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 14px;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: #5a6268;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

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

.btn-outline:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Sections */
.section {
    background: white;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.section-header h2 {
    font-size: 20px;
    color: var(--text-primary);
}

.section-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Search and Filters */
.search-filters {
    margin-bottom: var(--spacing-md);
}

.search-bar {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.search-input {
    flex: 1;
    min-width: 250px;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.filter-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.filter-group label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.filter-select {
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    background: white;
    cursor: pointer;
    transition: border-color 0.2s;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.product-count-bar {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 6px;
    margin-top: var(--spacing-md);
}

.product-count-info {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Selected Info */
.selected-info {
    padding: var(--spacing-sm) var(--spacing-md);
    background: #e3f2fd;
    border-radius: 6px;
    margin-top: var(--spacing-md);
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-color);
}

/* Table */
.table-container {
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

.products-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.products-table thead {
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 10;
}

.products-table th {
    padding: 12px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    white-space: nowrap;
}

.products-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: middle;
}

.products-table tbody tr:hover {
    background: var(--bg-secondary);
}

.products-table tbody tr.selected {
    background: #e3f2fd;
}

.checkbox-col {
    width: 40px;
    text-align: center;
}

.product-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.product-image {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 4px;
}

.product-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.product-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 14px;
}

.product-id {
    font-size: 11px;
    color: var(--text-tertiary);
    font-family: 'Courier New', monospace;
}

.variant-cell {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.variant-size {
    font-weight: 600;
    color: var(--text-primary);
}

.variant-id {
    font-size: 11px;
    color: var(--text-tertiary);
    font-family: 'Courier New', monospace;
}

.sku-barcode-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.sku-value,
.barcode-value {
    font-family: 'Courier New', monospace;
    font-size: 13px;
    color: var(--text-primary);
}

.custom-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.custom-sku-badge {
    background: #e3f2fd;
    color: #1976d2;
}

.custom-barcode-badge {
    background: #f3e5f5;
    color: #7b1fa2;
}

.qr-code-cell {
    display: flex;
    justify-content: center;
}

.btn-qr-view {
    padding: 4px 12px;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-qr-view:hover {
    background: #059669;
}

.notes-cell {
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 13px;
    color: var(--text-secondary);
}

.actions-cell {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-action {
    padding: 6px 12px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-edit {
    background: var(--info-color);
    color: white;
}

.btn-edit:hover {
    background: #2563eb;
}

.btn-delete {
    background: var(--danger-color);
    color: white;
}

.btn-delete:hover {
    background: #dc2626;
}

/* Loading State */
.loading-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-tertiary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--spacing-md);
}

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

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.pagination button {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.pagination button:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination .page-info {
    padding: 8px 16px;
    color: var(--text-secondary);
    font-size: 14px;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal.display-none {
    display: none;
}

.modal:not(.display-none) {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    cursor: pointer;
}

.modal-content {
    position: relative;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
    z-index: 1001;
}

.modal-content-small {
    width: 400px;
}

.modal-content-medium {
    width: 600px;
}

.modal-content-large {
    width: 900px;
}

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

.modal-title {
    font-size: 20px;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s;
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Form Styles */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.form-group label {
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.form-input {
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    font-style: italic;
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

/* QR Code Display */
.qr-code-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
}

.qr-code-image {
    max-width: 100%;
    height: auto;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: var(--spacing-sm);
    background: white;
}

.qr-code-info {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Import Modal */
.import-instructions {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 6px;
}

.import-instructions h3 {
    font-size: 16px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.import-instructions ul {
    margin-left: var(--spacing-lg);
    margin-top: var(--spacing-sm);
}

.import-instructions li {
    margin-bottom: var(--spacing-xs);
    font-size: 13px;
    color: var(--text-secondary);
}

.file-upload {
    margin-bottom: var(--spacing-md);
}

.file-input {
    display: none;
}

.file-label {
    display: inline-block;
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.file-label:hover {
    background: var(--primary-dark);
}

.import-preview {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 6px;
    max-height: 300px;
    overflow-y: auto;
}

.import-preview h4 {
    font-size: 14px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.import-preview-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

.import-preview-table th,
.import-preview-table td {
    padding: 6px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.import-preview-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
}

/* Toast Messages */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: 12px 20px;
    border-radius: 6px;
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast-success {
    background: var(--success-color);
    color: white;
}

.toast-error {
    background: var(--danger-color);
    color: white;
}

.toast-info {
    background: var(--info-color);
    color: white;
}

.toast-warning {
    background: var(--warning-color);
    color: white;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-tertiary);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: var(--spacing-md);
    }
    
    .filter-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-table {
        font-size: 12px;
    }
    
    .products-table th,
    .products-table td {
        padding: 8px;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .filter-row {
        grid-template-columns: 1fr;
    }
    
    .table-container {
        overflow-x: scroll;
    }
    
    .modal-content-small,
    .modal-content-medium,
    .modal-content-large {
        width: 95vw;
        max-height: 90vh;
    }
    
    .actions-cell {
        flex-direction: column;
    }
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus styles */
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}