renderer/css/app.css

/**
 * ============================================================================
 * CHAHUA DATABASE MANAGER - APPLICATION STYLES
 * ============================================================================
 * 
 * @fileoverview Main application styles and layout system
 * @author Chahua Development Thailand  
 * @version 1.0.0
 * 
 * @description
 * This file contains core application styles including:
 * - Global CSS reset and base styles
 * - CSS custom properties (CSS variables)
 * - Layout system (sidebar, main content, tabs)
 * - Typography and spacing system
 * - Utility classes
 * 
 * @dependencies
 * - themes.css (theme overrides)
 * - components.css (component styles)
 * 
 * @z-index-usage
 * 1000  - Tab controls, sidebar elements
 * 9999  - Dropdown menus, query editor header
 * 
 * @css-variables
 * All CSS custom properties are defined in :root for global access
 * Theme colors, spacing, fonts, borders, shadows, etc.
 * 
 * @responsive
 * Layout adapts to different screen sizes
 * Sidebar can be collapsed on smaller screens
 */

/* ============================================================================
   GLOBAL RESET & BASE STYLES  
   ============================================================================
   
   @description CSS reset for consistent rendering across browsers
   @note Uses box-sizing: border-box for all elements
   ============================================================================ */

/* ============================================================================
   GLOBAL STYLES & BASE ELEMENTS
   ============================================================================
   
   @component GlobalStyles
   @description Universal reset and base element styling
   @purpose Establish consistent foundation across all browsers
   @scope Global application styling
   
   @base-elements
   * - Universal box-sizing and reset
   body - Main application container with flex layout
   
   @features
   - Consistent box model (border-box)
   - Full viewport height layout
   - No margin/padding reset
   - Overflow hidden for contained layout
   ============================================================================ */

/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box; /* @layout Consistent box model */
}

/* ============================================================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ============================================================================
   
   @description Central definition of all design tokens
   @usage var(--property-name) throughout the application
   @theme These can be overridden in themes.css for different themes
   ============================================================================ */

:root {
    /* @theme Dark Theme Colors - Primary color palette */
    --bg-primary: #1e1e1e;     /* Main background */
    --bg-secondary: #252526;   /* Secondary background (modals, cards) */
    --bg-tertiary: #2d2d30;    /* Tertiary background (elevated elements) */
    --bg-hover: #3e3e42;       /* Hover state background */
    
    /* @theme Text Colors - Text hierarchy */
    --text-primary: #cccccc;   /* Primary text color */
    --text-secondary: #969696; /* Secondary text color */
    --text-muted: #6a6a6a;     /* Muted/disabled text */
    
    /* @theme UI Colors */
    --border-color: #3e3e42;   /* Standard border color */
    --accent-primary: #007acc; /* Primary accent (buttons, links) */
    --accent-hover: #1177bb;   /* Accent hover state */
    
    /* @theme Status Colors - Semantic color system */
    --success-color: #4caf50;  /* Success states */
    --warning-color: #ff9800;  /* Warning states */
    --error-color: #f44336;    /* Error states */
    --info-color: #2196f3;     /* Info states */
    
    /* @typography Font System */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; /* UI font */
    --font-mono: 'Consolas', 'Monaco', 'Courier New', monospace;    /* Code font */
    
    /* @spacing Spacing Scale - 8px base unit */
    --spacing-xs: 4px;   /* Extra small spacing */
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* @z-index Z-Index Scale - Centralized z-index management */
    --z-base: 1;           /* Base level */
    --z-dropdown: 1000;    /* Dropdowns, select options */
    --z-sticky: 1001;     /* Sticky headers */
    --z-overlay: 9000;    /* Background overlays */
    --z-modal: 10000;     /* Modal dialogs */
    --z-popover: 11000;   /* Popovers, tooltips */
    --z-tooltip: 12000;   /* Tooltips (highest) */
    
    /* Borders */
    --border-radius: 4px;
    --border-radius-lg: 8px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
}

/* ============================================================================
   NATIVE DIALOG COMPONENT (MODERN MODAL REPLACEMENT)
   ============================================================================
   
   @component NativeDialog
   @description Modern HTML5 <dialog> element styling
   @purpose Replace div-based modals with semantic, accessible dialogs
   @browser-support Modern browsers with native dialog support
   
   @advantages
   - No z-index conflicts (browser manages stacking)
   - Built-in backdrop and focus management
   - Semantic HTML with accessibility features
   - ESC key support out of the box
   - Proper modal behavior
   
   @structure
   <dialog class="app-dialog">
     <div class="modal-header">
     <div class="modal-body">
     <div class="modal-footer">
   </dialog>
   
   @javascript-api
   dialog.showModal() - Show as modal
   dialog.close()     - Close dialog
   dialog.open        - Check if open
   
   @backdrop
   Uses ::backdrop pseudo-element for overlay
   No need for separate overlay divs
   ============================================================================ */

.app-dialog {
    border: 0;
    padding: 0;
    width: min(560px, 90vw);
    max-height: 90vh;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    /* Remove default browser styling */
    margin: auto;
    position: fixed;
    inset: 0;
}

.app-dialog::backdrop {
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(2px);
    /* Backdrop automatically handles z-index */
}

/* Large dialog variant for complex forms */
.app-dialog.dialog-large {
    width: min(800px, 95vw);
    max-height: 95vh;
}

/* Small dialog variant for confirmations */
.app-dialog.dialog-small {
    width: min(400px, 85vw);
}

/* Dialog animation (optional - for smooth appearance) */
.app-dialog {
    transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}

.app-dialog:not([open]) {
    opacity: 0;
    transform: scale(0.95);
    pointer-events: none;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* ============================================================================
   APPLICATION HEADER LAYOUT
   ============================================================================
   
   @component AppHeaderLayout
   @description Modern gradient header with branding and navigation
   @purpose Top application bar with logo, title, and primary controls
   @height Fixed 60px with gradient accent line
   
   @features
   - Gradient background for visual appeal
   - Animated accent line at bottom
   - Responsive flex layout
   - Consistent spacing system
   - Professional shadows
   
   @structure
   Fixed header with flex justify-space-between layout
   Decorative gradient line at bottom edge
   ============================================================================ */

/* Header - Modern Style */
.app-header {
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
    border-bottom: 2px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
}

.app-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), transparent, var(--accent-primary));
}

/* ============================================================================
   MAIN LAYOUT CONTAINER SYSTEM
   ============================================================================
   
   @component MainLayoutContainer
   @description Core application layout containers
   @purpose Structure the main application interface
   @layout Flexbox-based responsive layout system
   
   @containers
   .main-container  - Root application container (100vh)
   .content-wrapper - Main content area with sidebar and content
   .sidebar         - Collapsible left navigation panel
   .main-content    - Primary content display area
   
   @features
   - Full viewport height layout
   - Responsive flex containers
   - Modern card-style panels
   - Consistent spacing and shadows
   - Smooth resize transitions
   
   @responsive
   Adapts from desktop sidebar layout to mobile stacked layout
   ============================================================================ */

/* Main Layout Improvements */
.main-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--bg-primary);
}

.content-wrapper {
    display: flex;
    flex: 1;
    overflow: hidden;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

.sidebar {
    width: 300px;
    min-width: 250px;
    max-width: 400px;
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    overflow-y: auto;
    resize: horizontal;
}

.main-content {
    flex: 1;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* ============================================================================
   RESPONSIVE LAYOUT SYSTEM
   ============================================================================
   
   @component ResponsiveLayout
   @description Mobile-first responsive layout system
   @breakpoints 1024px (tablet), 768px (mobile)
   @features Flexible sidebar, collapsible content
   @behavior Sidebar becomes full-width on smaller screens
   ============================================================================ */

/* Responsive Layout */
@media (max-width: 1024px) {
    .content-wrapper {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        min-width: unset;
        max-width: unset;
        resize: none;
    }
}

@media (max-width: 768px) {
    .content-wrapper {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
}

/* ============================================================================
   APPLICATION HEADER COMPONENT
   ============================================================================
   
   @component AppHeader
   @description Top navigation bar with logo, connection selector, and actions
   @layout Fixed height (60px) with flex layout
   @features Gradient background, connection management, responsive design
   @structure .header-left + .header-center + .header-right
   
   @sections
   .header-left   - Logo and app title
   .header-center - Connection selector dropdown
   .header-right  - Action buttons and user menu
   
   @responsive
   Adapts to smaller screens by hiding less important elements
   ============================================================================ */

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

.app-logo {
    width: 24px;
    height: 24px;
}

.header-left h1 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
    max-width: 500px;
}

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

.connection-select {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    font-size: 14px;
    min-width: 200px;
}

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

/* ============================================================================
   CONNECTION MANAGEMENT CONTROLS
   ============================================================================
   
   @component ConnectionControls
   @description Connection selector and management buttons
   @purpose Allow users to select and manage database connections
   @location Header center section
   
   @elements
   .connection-select - Dropdown for selecting active connection
   #deleteConnectionBtn - Button for removing selected connection
   
   @features
   - Styled select dropdown
   - Disabled states for safety
   - Consistent spacing and sizing
   - Focus states for accessibility
   
   @behavior
   Delete button disabled when no connection selected
   ============================================================================ */

/* ✅ เพิ่ม CSS สำหรับปุ่มลบ Connection */
#deleteConnectionBtn {
    padding: var(--spacing-xs) var(--spacing-sm);
    min-width: auto;
    font-size: 14px;
}

#deleteConnectionBtn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-secondary);
    color: var(--text-muted);
}

#deleteConnectionBtn:disabled:hover {
    background-color: var(--bg-secondary);
    transform: none;
}

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

.license-badge {
    padding: 6px 12px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.2s ease;
    cursor: default;
    display: none;
}

.license-badge.active {
    display: block;
}

.license-badge.safe {
    background: linear-gradient(135deg, #d3f9d8, #a8e6af);
    color: #2d5a2f;
    border-color: #7dd87f;
}

.license-badge.warning {
    background: linear-gradient(135deg, #fff3bf, #ffeaa0);
    color: #8b6b00;
    border-color: #e6cc00;
}

.license-badge.danger {
    background: linear-gradient(135deg, #ffe3e3, #ffb3b3);
    color: #8b0000;
    border-color: #ff6666;
    animation: pulse-warning 2s infinite;
}

.license-badge.error {
    background: linear-gradient(135deg, #f0f0f0, #d0d0d0);
    color: #666;
    border-color: #999;
}

@keyframes pulse-warning {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 12px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--error-color);
}

.status-dot.connected {
    background-color: var(--success-color);
}

.status-dot.connecting {
    background-color: var(--warning-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================================================
   SIDEBAR NAVIGATION COMPONENT
   ============================================================================
   
   @component Sidebar
   @description Left sidebar containing database browser and navigation
   @features Collapsible, resizable, database tree view
   @width 300px default, collapsible to 0px
   @resize-range 200px - 400px when expanded
   
   @structure
   .sidebar (main container)
   ├── .sidebar-header (title and controls)
   ├── .sidebar-content (scrollable content area)
   │   ├── .database-tree (database browser)
   │   └── .connection-list (saved connections)
   └── .sidebar-footer (additional controls)
   
   @states
   .sidebar.collapsed - Hidden sidebar (width: 0)
   .sidebar:hover     - Interaction feedback
   
   @responsive
   Full-width on mobile, collapsible on tablet/desktop
   ============================================================================ */

/* Main Layout */
.app-main {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 300px;
    min-width: 200px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width 0.3s ease;
}

.sidebar.collapsed {
    width: 0;
    min-width: 0;
    border-right: none;
    overflow: hidden;
}

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

.sidebar-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.sidebar-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

/* ============================================================================
   VERTICAL SPLITTER COMPONENT
   ============================================================================
   
   @component VerticalSplitter
   @description Draggable divider between sidebar and main content
   @purpose Allow users to resize sidebar width
   @width 4px with expanded hover area
   @cursor ew-resize (east-west resize)
   
   @features
   - Hover highlight effect
   - Smooth color transitions
   - Extended click area for easier interaction
   - Visual feedback on hover
   
   @interaction
   Drag left/right to resize adjacent panels
   ============================================================================ */

/* Vertical Splitter */
.vertical-splitter {
    width: 4px;
    background-color: var(--border-color);
    cursor: ew-resize;
    position: relative;
    flex-shrink: 0;
    transition: background-color 0.2s;
}

.vertical-splitter:hover {
    background-color: var(--accent-primary);
}

.vertical-splitter::before {
    content: '';
    position: absolute;
    left: -2px;
    right: -2px;
    top: 0;
    bottom: 0;
    background: transparent;
}

/* Collapsed sidebar show button */
.show-sidebar-btn {
    position: fixed;
    top: 50%;
    left: 10px;
    transform: translateY(-50%);
    background: var(--accent-primary);
    border: none;
    border-radius: var(--border-radius);
    color: white;
    padding: var(--spacing-sm);
    cursor: pointer;
    z-index: var(--z-dropdown); /* Use centralized z-index system */
    opacity: 0;
    visibility: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.show-sidebar-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-50%) scale(1.1);
}

.sidebar.collapsed ~ * .show-sidebar-btn,
body:has(.sidebar.collapsed) .show-sidebar-btn {
    opacity: 1;
    visibility: visible;
}

.database-tree {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.tree-placeholder {
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
}

.tree-node {
    margin-bottom: var(--spacing-xs);
}

.tree-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.tree-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.tree-item.active {
    background-color: var(--accent-primary);
    color: white;
}

.tree-icon {
    width: 16px;
    height: 16px;
    margin-right: var(--spacing-xs);
    flex-shrink: 0;
}

.tree-label {
    flex: 1;
}

.tree-meta {
    font-size: 12px;
    color: var(--text-muted);
    margin-left: var(--spacing-xs);
}

/* ============================================================================
   CONTENT AREA CONTAINER
   ============================================================================
   
   @component ContentArea
   @description Main content display area for tabs and views
   @purpose Container for tab-based content navigation
   @layout Flex column with tab bar and content sections
   
   @structure
   .content-area (main container)
   ├── .tab-bar (navigation tabs)
   └── .tab-content (active content)
   
   @features
   - Full height flex layout
   - Overflow handling
   - Seamless integration with tab system
   - Responsive content sizing
   ============================================================================ */

/* Content Area */
.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ============================================================================
   TAB BAR NAVIGATION SYSTEM
   ============================================================================
   
   @component TabBar
   @description Horizontal tab navigation for multiple views
   @purpose Allow users to switch between different database views/queries
   @layout Fixed height (36px) with flex alignment
   @behavior Active tab highlighted, hover effects, closeable tabs
   
   @structure
   .tab-bar (container)
   └── .tab-item (individual tab)
       ├── .tab-icon (optional icon)
       ├── .tab-label (tab title)
       └── .tab-close (close button)
   
   @states
   .tab-item.active - Currently selected tab
   .tab-item:hover  - Tab hover state
   .tab-item.dirty  - Tab with unsaved changes
   
   @features
   - Browser-like tab interface
   - Closeable tabs with confirmation
   - Visual indicators for unsaved changes
   - Keyboard navigation support
   ============================================================================ */

/* Tab Bar */
.tab-bar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-end;
    padding: 0 var(--spacing-md);
    min-height: 36px;
}

.tab-item {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-bottom: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    padding: var(--spacing-xs) var(--spacing-md);
    margin-right: var(--spacing-xs);
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: all 0.2s;
    max-width: 200px;
}

.tab-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.tab-item.active {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-bottom: 1px solid var(--bg-primary);
    margin-bottom: -1px;
}

.tab-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    padding: 0;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 2px;
}

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

/* ============================================================================
   TAB CONTENT SYSTEM
   ============================================================================
   
   @component TabContent
   @description Content containers for tab-based navigation
   @purpose Display different views based on active tab
   @behavior Show/hide content using display: flex/none
   
   @structure
   .tab-content (main container)
   └── .tab-pane (individual content panels)
       └── [specific content layouts]
   
   @types
   .tab-pane.active     - Currently visible content
   .table-only-tab      - Dedicated table view layout
   .query-editor-tab    - SQL query editor layout
   .database-browser-tab - Database structure browser
   
   @features
   - Smooth content switching
   - Full-height content areas
   - Overflow handling
   - Flexible content types
   ============================================================================ */

/* Tab Content */
.tab-content {
    flex: 1;
    overflow: hidden;
}

.tab-pane {
    height: 100%;
    display: none;
    flex-direction: column;
}

.tab-pane.active {
    display: flex;
}

/* ============================================================================
   TABLE-ONLY TAB LAYOUT
   ============================================================================
   
   @component TableOnlyTab
   @description Dedicated full-screen table view layout
   @purpose Display database tables without query editor
   @layout Full-height table container with toolbar
   
   @structure
   .table-only-tab (main container)
   └── .table-only-container (table layout)
       ├── .table-toolbar (table actions)
       └── .table-container (AG Grid table)
   
   @features
   - Full-height table display
   - Optimized for data browsing
   - No height restrictions (auto sizing)
   - Clean, minimal interface
   ============================================================================ */

/* ✅ Table-only Tab Styles */
.table-only-tab {
    background: var(--bg-primary);
    height: 100%;
    overflow: hidden;
}

.table-only-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.table-only-container .results-content {
    flex: 1;
    overflow: auto;
    position: relative;
    height: 100%;
}

/* ============================================================================
   AG GRID INTEGRATION FIXES
   ============================================================================
   
   @component AGGridFixes
   @description CSS fixes for AG Grid integration in table tabs
   @purpose Resolve height and layout issues with AG Grid Community
   @integration AG Grid Community Edition v31
   
   @fixes
   - Full height grid display in table tabs
   - Proper flex layout for grid wrapper
   - Override default height constraints
   - Seamless container integration
   
   @ag-grid-classes
   .ag-grid-wrapper - Custom wrapper for grid container
   .ag-theme-balham-dark - AG Grid dark theme integration
   ============================================================================ */

/* แก้ไขปัญหา AG Grid ใน Table Tab */
.table-only-tab .ag-grid-wrapper {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.table-only-tab .ag-theme-balham-dark {
    flex: 1;
    height: auto !important;
}

/* ============================================================================
   TABLE HEADER FIXES
   ============================================================================
   
   @component TableHeaderFixes
   @description Layout fixes for table toolbar in table-only tabs
   @purpose Ensure toolbar doesn't interfere with table height calculations
   @issue Toolbar height affecting AG Grid sizing
   
   @fix
   .table-toolbar with flex-shrink: 0 prevents compression
   Ensures consistent toolbar height in table layouts
   ============================================================================ */

/* แก้ไขปัญหา Table Header */
.table-only-tab .table-toolbar {
    flex-shrink: 0;
}

.table-only-tab .table-container {
    flex: 1;
    height: auto;
    max-height: none;
}

/* ============================================================================
   SQL QUERY TAB LAYOUT
   ============================================================================
   
   @component SQLQueryTab
   @description Split-view layout for SQL query editing and results
   @purpose Provide IDE-like SQL development environment
   @layout Split between query editor (top) and results (bottom)
   @resize Query section is resizable (300px default, 200px minimum)
   
   @structure
   .sql-query-tab (main container)
   ├── .query-section (SQL editor area)
   │   └── .query-editor-container
   │       ├── .query-toolbar (execute, save, etc.)
   │       └── .sql-editor (code editor)
   └── .results-section (results display area)
       └── .results-container
           ├── .results-info (execution metadata)
           └── .results-table (AG Grid results)
   
   @features
   - Resizable split layout
   - Syntax highlighted SQL editor
   - Query execution controls
   - Results with metadata
   - Error display
   ============================================================================ */

/* SQL Query Tab Styles */
.sql-query-tab {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.sql-query-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.sql-query-tab .query-section {
    flex: 0 0 300px; /* ความสูงของ Query Editor */
    min-height: 200px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sql-query-tab .results-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sql-query-tab .query-editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sql-query-tab .results-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sql-query-tab .results-content {
    flex: 1;
    overflow: auto;
    position: relative;
    display: flex;
    flex-direction: column;
}

.sql-query-tab .ag-grid-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sql-query-tab .ag-theme-balham-dark {
    flex: 1;
    min-height: 0;
}

/* ============================================================================
   SIDEBAR SQL QUERY ITEMS
   ============================================================================
   
   @component SidebarSQLQueryItems
   @description Special styling for SQL query items in sidebar navigation
   @purpose Distinguish SQL query tabs from other navigation items
   @visual Left border accent with enhanced background
   
   @features
   - Visual distinction with left border accent
   - Enhanced background color
   - Hover state improvements
   - Font weight emphasis
   
   @usage
   Applied to tree items representing saved/open SQL queries
   ============================================================================ */

/* Sidebar SQL Query Item Styles */
.tree-item.sql-query-item {
    background: var(--bg-tertiary);
    border-left: 3px solid var(--accent-primary);
    font-weight: 500;
}

.tree-item.sql-query-item:hover {
    background: var(--bg-hover);
}

/* ============================================================================
   SPLIT LAYOUT SYSTEM
   ============================================================================
   
   @component SplitLayout
   @description Flexible split-view layouts for query editor and results
   @purpose Provide resizable, responsive layout containers
   @types Horizontal split (side-by-side) and Vertical split (top-bottom)
   
   @structure-horizontal
   .horizontal-split-container
   ├── .query-panel (45% width, min 300px, max 70%)
   └── .results-panel (remaining width)
   
   @structure-vertical
   .vertical-split-container
   ├── .query-panel (200px height, min 150px, no max)
   └── .results-panel (remaining height, min 200px)
   
   @features
   - Responsive flex layouts
   - Minimum and maximum size constraints
   - Smooth resize transitions
   - Overflow handling
   - Consistent spacing
   
   @usage
   Used in SQL query tabs and database browser views
   ============================================================================ */

/* Horizontal Split Layout */
.horizontal-split-container {
    display: flex;
    height: 100%;
    overflow: hidden;
}

/* Vertical Split Layout */
.vertical-split-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.query-panel {
    flex: 0 0 200px; /* Initial height for vertical layout */
    min-height: 150px;
    max-height: none; /* ลบ max-height เพื่อให้ย่อขยายได้เต็มที่ */
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    overflow: auto;
}

/* For horizontal split (if still used elsewhere) */
.horizontal-split-container .query-panel {
    flex: 0 0 45%; /* Initial width: 45% */
    min-width: 300px;
    max-width: 70%;
    border-right: 1px solid var(--border-color);
    border-top: none;
}

.results-panel {
    flex: 1;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    overflow: hidden;
}

/* For horizontal split (if still used elsewhere) */
.horizontal-split-container .results-panel {
    min-width: 300px;
}

/* ============================================================================
   RESIZABLE SPLITTER COMPONENT
   ============================================================================
   
   @component ResizableSplitter
   @description Interactive splitter for resizing layout panels
   @purpose Allow dynamic panel resizing with visual feedback
   @width Fixed 4px with extended interaction area
   
   @features
   - Hover highlight effect
   - Active drag state styling
   - High z-index for interaction priority
   - Smooth color transitions
   - Visual grip indicators
   
   @interaction
   - Hover shows highlighted state
   - Drag operation changes cursor globally
   - Visual feedback during resize operation
   ============================================================================ */

/* Resizable Splitter */
.splitter {
    flex: 0 0 4px;
    background: var(--border-color);
    position: relative;
    transition: background-color 0.2s;
    z-index: 10; /* ให้อยู่ด้านหน้า */
}

.splitter:hover {
    background: var(--accent-primary);
}

.splitter::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--text-muted);
    border-radius: 1px;
}

.vertical-splitter {
    cursor: col-resize;
}

.vertical-splitter::before {
    width: 2px;
    height: 20px;
}

.horizontal-splitter {
    cursor: row-resize;
    user-select: none; /* ป้องกันการเลือกข้อความ */
}

.horizontal-splitter::before {
    width: 20px;
    height: 2px;
}

/* เพิ่ม style เมื่อกำลัง resize */
.splitter.resizing {
    background: var(--accent-primary);
}

body.resizing {
    cursor: row-resize !important;
    user-select: none !important;
}

/* ============================================================================
   SPLITTER HANDLES
   ============================================================================
   
   @component Splitter
   @description Draggable handles for resizing split panels
   @types .vertical-splitter (column resize) and .horizontal-splitter (row resize)
   @size 4px thick with extended hover area
   
   @features
   - Visual indicators (lines) at center
   - Hover highlighting
   - Resize cursors (col-resize/row-resize)
   - Active state during dragging
   - Smooth transitions
   
   @states
   :hover      - Highlighted splitter
   .resizing   - Active during drag operation
   body.resizing - Global cursor override during resize
   
   @interaction
   Drag to resize adjacent panels with constraints
   ============================================================================ */

/* ============================================================================
   QUERY EDITOR COMPONENT
   ============================================================================
   
   @component QueryEditor
   @description SQL code editor with syntax highlighting and execution
   @purpose Advanced SQL development environment
   @features Syntax highlighting, auto-complete, query execution
   @integration Monaco Editor or CodeMirror for advanced editing
   
   @structure
   .query-editor-container (main container)
   ├── .query-toolbar (execution controls)
   │   ├── .execute-btn (run query)
   │   ├── .save-btn (save query)
   │   └── .format-btn (format SQL)
   └── .sql-editor (code editor area)
   
   @features
   - SQL syntax highlighting
   - Line numbers
   - Auto-completion
   - Error indicators
   - Query execution
   ============================================================================ */

/* Query Editor */
.query-editor-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ============================================================================
   EDITOR TOOLBAR COMPONENT
   ============================================================================
   
   @component EditorToolbar
   @description Top toolbar for query editor with action buttons and metadata
   @purpose Provide quick access to common query operations
   @layout Horizontal flex with left-aligned controls and right-aligned metadata
   
   @structure
   .editor-toolbar (main container)
   ├── [action buttons] (execute, save, format)
   ├── .toolbar-separator (visual divider)
   ├── .toolbar-spacer (flex spacer)
   └── .execution-time (query performance info)
   
   @elements
   - Execute query button
   - Save query button  
   - Format SQL button
   - Export results button
   - Execution time display
   - Row count display
   
   @features
   - Responsive button grouping
   - Visual separators
   - Performance metrics
   - Keyboard shortcuts
   ============================================================================ */

.editor-toolbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.toolbar-spacer {
    flex: 1;
}

.toolbar-separator {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 var(--spacing-sm);
}

.execution-time {
    font-size: 12px;
    color: var(--text-muted);
}

.query-editor {
    flex: 1;
    position: relative;
    overflow: hidden;
    min-height: 100px;
}

.sql-editor {
    width: 100%;
    height: 100%;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    outline: none;
    overflow-y: auto;
    white-space: pre;
    word-wrap: break-word;
}

.sql-editor::placeholder {
    color: var(--text-muted);
}

/**
 * @subsection Parameters Section
 * @description Query parameters input interface
 */
.params-section {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 8px;
}

.params-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.params-help {
    cursor: help;
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.params-help:hover {
    opacity: 1;
}

.params-editor {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 12px;
    resize: vertical;
    transition: border-color 0.2s ease;
}

.params-editor:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.1);
}

/* ============================================================================
   RESULTS DISPLAY SYSTEM
   ============================================================================
   
   @component ResultsContainer
   @description Query results display with headers, actions, and data grid
   @purpose Show query execution results with metadata and export options
   @integration AG Grid for data display with custom theming
   
   @structure
   .results-container (main container)
   ├── .results-header (title and action buttons)
   │   ├── h3 (results title)
   │   └── .results-actions (export, copy, etc.)
   └── .results-content (data display area)
       ├── .ag-grid-wrapper (AG Grid container)
       └── .results-placeholder (empty state)
   
   @features
   - Query execution metadata
   - Export functionality
   - Scrollable data grid
   - Empty state handling
   - Performance information
   - Row count display
   
   @states
   - Loading state during query execution
   - Results state with data
   - Error state for failed queries
   - Empty state for no results
   ============================================================================ */

/* Results Container */
.results-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.results-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.results-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

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

.results-content {
    flex: 1;
    overflow: auto;
    position: relative;
    display: flex;
    flex-direction: column;
}

.results-content .ag-grid-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.results-content .ag-grid-wrapper .ag-theme-balham-dark {
    flex: 1;
    min-height: 0;
}

.results-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    font-size: 14px;
}

/* ============================================================================
   DATA TABLE COMPONENT
   ============================================================================
   
   @component DataTable
   @description Custom styled table for displaying query results and data
   @purpose Alternative to AG Grid for simpler data display needs
   @features Sortable columns, editable cells, responsive design
   
   @structure
   .data-table (main table)
   ├── thead
   │   └── th.sortable (sortable column headers)
   └── tbody
       └── td.editing (editable cells)
   
   @interactions
   - Column sorting (click headers)
   - Cell editing (double-click)
   - Column resizing (drag headers)
   - Row selection (click rows)
   
   @sorting-indicators
   th.sortable::after  - Neutral sort indicator (↕)
   th.sort-asc::after  - Ascending indicator (↑)
   th.sort-desc::after - Descending indicator (↓)
   
   @responsive
   - Text overflow handling
   - Minimum/maximum column widths
   - Horizontal scrolling on small screens
   ============================================================================ */

/* Table Styles */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    font-family: var(--font-mono);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    position: relative;
}

.data-table th {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 8px 12px;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 100px;
    max-width: 300px;
}

.data-table th:hover {
    background-color: var(--bg-hover);
}

.data-table th.sortable::after {
    content: ' ↕';
    color: var(--text-muted);
    font-size: 10px;
}

.data-table th.sort-asc::after {
    content: ' ↑';
    color: var(--accent-primary);
}

.data-table th.sort-desc::after {
    content: ' ↓';
    color: var(--accent-primary);
}

.data-table td {
    padding: 6px 12px;
    border-bottom: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    color: var(--text-secondary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: text;
    position: relative;
}

.data-table td:hover {
    background-color: var(--bg-hover);
}

.data-table td.editing {
    padding: 0;
    background-color: var(--bg-primary);
}

.data-table td.editing input {
    width: 100%;
    height: 100%;
    border: 2px solid var(--accent-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 6px 12px;
    font-family: inherit;
    font-size: inherit;
    outline: none;
}

.data-table tr:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.data-table tr.selected {
    background-color: rgba(0, 122, 204, 0.3);
}

.data-table td.null-value {
    color: var(--text-muted);
    font-style: italic;
}

.data-table td.modified {
    background-color: rgba(255, 152, 0, 0.2);
    border-left: 3px solid var(--warning-color);
}

.data-table td.new-row {
    background-color: rgba(76, 175, 80, 0.2);
    border-left: 3px solid var(--success-color);
}

.data-table td.deleted-row {
    background-color: rgba(244, 67, 54, 0.2);
    border-left: 3px solid var(--error-color);
    text-decoration: line-through;
}

/* ============================================================================
   TABLE ROW ACTIONS & STATES
   ============================================================================
   
   @component TableRowActions
   @description Interactive row-level actions and visual state indicators
   @purpose Provide CRUD operations and visual feedback for data changes
   @position Left side of rows (hover to reveal)
   
   @row-states
   .selected     - Selected row (blue background)
   .null-value   - NULL value cells (italicized, muted)
   .modified     - Modified cells (orange left border)
   .new-row      - New rows (green left border)
   .deleted-row  - Deleted rows (red border + strikethrough)
   
   @actions
   .row-actions (container)
   └── .row-action-btn (individual action buttons)
       ├── Edit button
       ├── Delete button
       └── Duplicate button
   
   @behavior
   - Actions appear on row hover
   - Color-coded state indicators
   - Smooth transitions
   - Absolute positioning for overlay effect
   
   @accessibility
   - Visual and color indicators combined
   - Keyboard navigation support
   - Clear action button styling
   ============================================================================ */

/* Row actions */
.row-actions {
    position: absolute;
    left: -30px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity 0.2s;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.data-table tr:hover .row-actions {
    opacity: 1;
}

.row-action-btn {
    width: 20px;
    height: 20px;
    border: none;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.row-action-btn:hover {
    background: var(--bg-hover);
}

.row-action-btn.delete {
    color: var(--error-color);
}

.row-action-btn.add {
    color: var(--success-color);
}

/* ============================================================================
   TABLE TOOLBAR COMPONENT
   ============================================================================
   
   @component TableToolbar
   @description Top toolbar for table views with title, filters, and actions
   @purpose Provide table management controls and filtering capabilities
   @layout Horizontal flex with space-between alignment
   
   @structure
   .table-toolbar (main container)
   ├── .table-name (table title/identifier)
   ├── .table-filter (search and filter controls)
   │   └── input (search field)
   └── .table-actions (action buttons)
       ├── Save button
       ├── Refresh button
       ├── Export button
       └── Settings button
   
   @features
   - Live search/filtering
   - Bulk actions for selected rows
   - Table configuration options
   - Export functionality
   - Responsive button grouping
   
   @responsive
   On smaller screens, actions may wrap or hide less important items
   ============================================================================ */

/* Table toolbar */
.table-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-md);
}

.table-toolbar .table-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

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

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

.table-filter input {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 4px 8px;
    border-radius: var(--border-radius);
    font-size: 12px;
    width: 200px;
}

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

/* Table container with scroll */
.table-container {
    position: relative;
    overflow: auto;
    max-height: calc(100vh - 300px);
    border: 1px solid var(--border-color);
}

.table-container::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

.table-container::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.table-container::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 6px;
}

.table-container::-webkit-scrollbar-thumb:hover {
    background: var(--bg-hover);
}

/* ============================================================================
   CONTEXT MENU COMPONENT  
   ============================================================================
   
   @component ContextMenu
   @description Right-click context menus for table rows, cells, and UI elements
   @purpose Provide contextual actions based on user selection
   @z-index 1000 (above most elements but below modals)
   @positioning Fixed positioning based on mouse coordinates
   
   @structure
   .context-menu (main container)
   ├── .context-menu-item (individual menu options)
   │   ├── [icon] (optional action icon)
   │   └── [text] (action label)
   └── .context-menu-separator (visual dividers)
   
   @item-types
   - Copy actions (copy cell, copy row, copy table)
   - Edit actions (edit cell, insert row, delete row)
   - Export actions (export selection, export table)
   - Navigation actions (go to, filter by)
   
   @states
   .context-menu-item.disabled - Unavailable actions (greyed out)
   .context-menu-item:hover    - Highlighted menu item
   
   @behavior
   - Appears on right-click
   - Closes on click outside or ESC key
   - Position adjusts to stay within viewport
   ============================================================================ */

/* Context menu */
.context-menu {
    position: fixed;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-popover); /* Context menus above modals */
    min-width: 150px;
    padding: 4px 0;
}

.context-menu-item {
    padding: 8px 16px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.context-menu-item:hover {
    background: var(--bg-hover);
}

.context-menu-item.disabled {
    color: var(--text-muted);
    cursor: not-allowed;
}

.context-menu-separator {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
}

/* Row numbers and table stats */
.row-number-header,
.row-number {
    background-color: var(--bg-tertiary) !important;
    color: var(--text-muted);
    text-align: center;
    font-weight: normal;
    width: 50px;
    min-width: 50px;
    max-width: 50px;
    user-select: none;
}

.row-number:hover {
    background-color: var(--bg-hover) !important;
}

.table-stats {
    color: var(--text-muted);
    font-size: 12px;
    margin-left: 8px;
}

.table-info {
    display: flex;
    align-items: center;
}

.table-wrapper {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
}

/* ============================================================================
   RESULTS INFO BAR COMPONENT
   ============================================================================
   
   @component ResultsInfoBar
   @description Bottom information bar showing query/table metadata
   @purpose Display execution statistics and data information
   @position Bottom of table/results containers
   
   @content
   - Row count (total, selected, filtered)
   - Execution time for queries
   - Change status indicators
   - Performance metrics
   - Data source information
   
   @features
   - Responsive text layout
   - Real-time updates
   - Status color coding
   - Compact information display
   
   @integration
   Updates automatically from query execution and table operations
   ============================================================================ */

/* Results info bar */
.results-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-muted);
}

.results-info span {
    margin-right: var(--spacing-md);
}

#changesStatus {
    font-weight: 500;
}

/* ============================================================================
   ENHANCED BUTTON STYLES
   ============================================================================
   
   @component EnhancedButtons
   @description Additional button variants and states
   @purpose Extend base button system with specialized styles
   @extends Base button system from earlier definitions
   
   @variants
   .btn-sm - Small button variant (compact spacing)
   
   @states
   :disabled - Disabled button state (opacity + pointer blocking)
   
   @features
   - Consistent sizing system
   - Proper disabled states
   - Accessibility considerations
   - Reduced padding for compact UIs
   ============================================================================ */

/* Enhanced button styles */
.btn-sm {
    padding: 4px 8px;
    font-size: 12px;
    border-radius: 3px;
}

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

/* ============================================================================
   LOADING STATES SYSTEM
   ============================================================================
   
   @component LoadingStates
   @description Visual indicators for loading and processing states
   @purpose Provide user feedback during data operations
   @types Table loading, button loading, general loading overlays
   
   @implementations
   .table-loading - Table-specific loading overlay
   .btn.loading   - Button with inline spinner
   .loading-overlay - Full-screen loading state
   
   @features
   - Semi-transparent overlays
   - Animated spinners
   - Non-blocking UI feedback
   - Smooth transitions
   
   @animations
   - Spinning indicators
   - Fade in/out effects
   - Pulse animations for attention
   
   @accessibility
   - Screen reader announcements
   - Keyboard interaction preservation
   - Clear visual indicators
   ============================================================================ */

/* Loading states */
.table-loading {
    position: relative;
}

.table-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

/* ============================================================================
   SELECTION & INTERACTION STATES
   ============================================================================
   
   @component SelectionStates
   @description Visual feedback for selected rows, cells, and interactive elements
   @purpose Indicate user selections and active elements
   @color-scheme Blue accent colors for consistency
   
   @selection-types
   .selected (row)  - Entire row selected (light blue background)
   .selected (cell) - Individual cell selected (stronger blue + border)
   
   @features
   - Multi-row selection support
   - Individual cell selection
   - Visual hierarchy (cell > row selection)
   - Keyboard navigation feedback
   ============================================================================ */

/* ============================================================================
   DRAG & DROP INTERACTION SYSTEM
   ============================================================================
   
   @component DragDrop
   @description Column resizing and drag-drop interactions
   @purpose Allow users to customize table layout
   @features Column width adjustment, drag handles
   
   @elements
   .resizing - Active resize state with visual feedback
   .column-resize-handle - Invisible resize trigger area
   
   @behavior
   - Hover shows resize cursor
   - Active resize shows blue border
   - Smooth visual feedback
   ============================================================================ */

/* Selection styles */
.data-table tr.selected td {
    background-color: rgba(0, 122, 204, 0.3);
}

.data-table td.selected {
    background-color: rgba(0, 122, 204, 0.5);
    border: 2px solid var(--accent-primary);
}

/* Drag and drop styles */
.data-table th.resizing {
    cursor: col-resize;
    border-right: 2px solid var(--accent-primary);
}

.column-resize-handle {
    position: absolute;
    right: 0;
    top: 0;
    width: 4px;
    height: 100%;
    cursor: col-resize;
    background: transparent;
}

.column-resize-handle:hover {
    background: var(--accent-primary);
}

/* ============================================================================
   BUTTON COMPONENT SYSTEM
   ============================================================================
   
   @component Buttons
   @description Modern button system with animations and visual effects
   @purpose Provide consistent, interactive UI controls throughout the app
   @features Gradients, shadows, hover effects, shine animation
   
   @base-class .btn
   - Gradient backgrounds for depth
   - Box shadows for elevation
   - Hover lift effect (translateY)
   - Shine animation on hover
   - Disabled states
   
   @variants
   .btn-primary   - Primary action buttons (blue gradient)
   .btn-secondary - Secondary actions (default styling)
   .btn-success   - Success actions (green)
   .btn-warning   - Warning actions (orange)
   .btn-danger    - Destructive actions (red)
   .btn-sm        - Small size buttons
   
   @states
   :hover     - Elevated with enhanced shadow
   :active    - Pressed state (reduced elevation)
   :disabled  - Greyed out, no interactions
   
   @animations
   - Hover lift effect (translateY: -2px)
   - Shine sweep animation on hover
   - Smooth transitions for all states
   ============================================================================ */

/* Buttons - Modern Style with Shadow and Hover Effects */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
    color: var(--text-primary);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.4), 0 3px 6px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-primary);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary {
    background: linear-gradient(145deg, #007acc, #005599);
    color: white;
    border-color: #007acc;
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(145deg, #1177bb, #007acc);
    border-color: #1177bb;
    box-shadow: 0 8px 15px rgba(0, 122, 204, 0.4), 0 3px 6px rgba(0, 0, 0, 0.3);
}

.btn-success {
    background: linear-gradient(145deg, #4caf50, #45a049);
    color: white;
    border-color: #4caf50;
}

.btn-success:hover:not(:disabled) {
    background: linear-gradient(145deg, #66bb6a, #4caf50);
    border-color: #66bb6a;
    box-shadow: 0 8px 15px rgba(76, 175, 80, 0.4), 0 3px 6px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background: linear-gradient(145deg, #ffffff, #f8f9fa);
    color: #2c3e50;
    border-color: #e9ecef;
}

.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(145deg, #f8f9fa, #e9ecef);
    border-color: #007acc;
    color: #007acc;
    box-shadow: 0 8px 15px rgba(0, 122, 204, 0.2), 0 3px 6px rgba(0, 0, 0, 0.1);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-outline:hover:not(:disabled) {
    background: linear-gradient(145deg, var(--bg-hover), var(--bg-tertiary));
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-icon:hover:not(:disabled) {
    background: linear-gradient(145deg, var(--bg-hover), var(--bg-tertiary));
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

/* ============================================================================
   MODERN CARD & SECTION SYSTEM
   ============================================================================
   
   @component ModernCard
   @description Elevated card components for content sections
   @purpose Organize content in visually appealing, interactive containers
   @features Gradient backgrounds, shadows, hover effects
   
   @types
   .modern-card    - General content cards with hover lift
   .section-header - Header sections with subtle gradients
   .section-content - Content containers with inset shadows
   
   @features
   - Gradient backgrounds for depth
   - Smooth hover animations
   - Consistent spacing system
   - Color-coded headers
   - Subtle shadow effects
   
   @responsive
   Cards stack on smaller screens, maintain consistent spacing
   ============================================================================ */

/* ============================================================================
   RESPONSIVE GRID SYSTEM
   ============================================================================
   
   @component ResponsiveGrid
   @description CSS Grid layouts for responsive content organization
   @purpose Flexible grid systems that adapt to screen size
   @breakpoint-behavior Auto-fit columns based on minimum widths
   
   @grid-types
   .responsive-grid   - Auto-fit columns (min 250px)
   .responsive-grid-2 - 2-column layout with responsive fallback
   .responsive-grid-3 - 3-column layout with responsive fallback
   
   @features
   - Automatic column sizing
   - Consistent gap spacing
   - Mobile-first responsive design
   - Flexible content areas
   ============================================================================ */

/* Modern Card/Section Styles */
.modern-card {
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.modern-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.4), 0 3px 6px rgba(0, 0, 0, 0.3);
}

.modern-card h2, .modern-card h3 {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--accent-primary);
}

.section-header {
    background: linear-gradient(145deg, var(--bg-tertiary), var(--bg-hover));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.section-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Responsive Grid System */
.responsive-grid {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.responsive-grid-2 {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.responsive-grid-3 {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

@media (max-width: 768px) {
    .responsive-grid,
    .responsive-grid-2,
    .responsive-grid-3 {
        grid-template-columns: 1fr;
    }
    
    .modern-card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-md);
    }
}

/* ============================================================================
   FORM ELEMENTS SYSTEM
   ============================================================================
   
   @component FormElements
   @description Styled form inputs and layout components
   @purpose Consistent form styling throughout the application
   @integration Works with modal dialogs and settings panels
   
   @layout-components
   .form-group - Vertical spacing for form sections
   .form-row   - Horizontal layout for related inputs
   .form-col   - Flexible column within form rows
   
   @input-elements
   .form-control - Base input styling
   .form-select  - Dropdown selects
   .form-check   - Checkbox/radio containers
   
   @features
   - Consistent spacing system
   - Responsive form layouts
   - Focus states and validation
   - Accessibility considerations
   ============================================================================ */

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
}

.form-row .form-group {
    flex: 1;
}

label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

input[type="text"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: var(--spacing-sm);
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-family);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 122, 204, 0.2);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

/* ============================================================================
   LOADING OVERLAY COMPONENT
   ============================================================================
   
   @component LoadingOverlay
   @description Full-screen loading overlay for blocking operations
   @purpose Prevent user interaction during critical operations
   @z-index 1000 (high priority overlay)
   
   @features
   - Full viewport coverage
   - Semi-transparent backdrop
   - Centered loading indicator
   - Hidden by default (display: none)
   - High z-index for overlay priority
   
   @usage
   Shown during:
   - Database connection establishment
   - Large data imports/exports
   - Plugin installations
   - Critical system operations
   
   @states
   .loading-overlay.active - Visible overlay state
   ============================================================================ */

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-overlay); /* Loading below modals and dialogs */
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-primary);
    font-size: 14px;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.text-success {
    color: var(--success-color);
}

.text-error {
    color: var(--error-color);
}

.text-warning {
    color: var(--warning-color);
}

/* ============================================================================
   DIALOG UTILITIES & MODAL MIGRATION
   ============================================================================
   
   @component DialogUtilities
   @description Utility classes and migration helpers for dialog system
   @purpose Smooth transition from div-based modals to native dialogs
   
   @utilities
   .dialog-open     - Applied to body when dialog is open
   .modal-legacy    - Backward compatibility for existing modals
   .no-scroll       - Prevent body scrolling when dialog open
   
   @migration-note
   Legacy .modal classes are maintained for backward compatibility
   New dialogs should use .app-dialog class
   ============================================================================ */

/* Prevent body scroll when dialog is open */
body.dialog-open {
    overflow: hidden;
}

/* Legacy modal support (for gradual migration) */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-modal);
    display: none;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(2px);
}

.modal-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

/* Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background-color: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: var(--bg-hover);
}

/* Responsive */
@media (max-width: 1200px) {
    .sidebar {
        width: 250px;
    }
}

@media (max-width: 900px) {
    .app-header {
        flex-wrap: wrap;
        height: auto;
        padding: var(--spacing-sm);
    }
    
    .header-center {
        order: 3;
        flex-basis: 100%;
        margin-top: var(--spacing-sm);
        max-width: none;
    }
}

/* DBeaver-style Table Enhancements */
.table-wrapper.dbeaver-style {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-secondary);
}

.table-toolbar.enhanced {
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.table-info .table-name {
    font-weight: 600;
    color: var(--accent-primary);
    font-size: 14px;
}

.table-info .table-stats {
    color: var(--text-muted);
    font-size: 12px;
    margin-left: var(--spacing-sm);
}

.table-controls {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.filter-input {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 4px 8px;
    border-radius: var(--border-radius);
    font-size: 12px;
    width: 200px;
}

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

.table-container.scrollable {
    max-height: 600px;
    overflow: auto;
    border: 1px solid var(--border-color);
}

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

.data-table.dbeaver-table th {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    padding: 6px 8px;
    text-align: left;
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
}

.column-header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.column-name {
    font-weight: 600;
    color: var(--text-primary);
}

.column-type {
    font-size: 10px;
    color: var(--text-muted);
    font-weight: normal;
}

.sort-indicator {
    font-size: 10px;
    color: var(--text-muted);
}

.sortable:hover {
    background: var(--bg-hover);
    cursor: pointer;
}

.sortable.sort-asc .sort-indicator::after {
    content: ' ▲';
    color: var(--accent-primary);
}

.sortable.sort-desc .sort-indicator::after {
    content: ' ▼';
    color: var(--accent-primary);
}

.data-table.dbeaver-table td {
    border: 1px solid var(--border-color);
    padding: 4px 8px;
    background: var(--bg-secondary);
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.data-cell:hover {
    background: var(--bg-hover);
}

.data-cell:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: -2px;
}

.sticky-column {
    position: sticky;
    left: 0;
    z-index: 5;
    background: var(--bg-tertiary) !important;
    border-right: 2px solid var(--border-color) !important;
    font-weight: 600;
}

.null-indicator {
    color: var(--text-muted);
    font-style: italic;
    font-size: 11px;
}

.data-cell.null-value {
    background: var(--bg-primary);
    color: var(--text-muted);
}

.data-cell.modified {
    background: rgba(255, 152, 0, 0.2);
    border-color: var(--warning-color);
}

.data-cell.empty-cell {
    background: var(--bg-primary);
    opacity: 0.7;
}

.data-cell.long-text {
    cursor: help;
}

.data-row:hover td {
    background: var(--bg-hover);
}

.data-row.empty-row td {
    background: var(--bg-primary);
    opacity: 0.6;
}

.data-row.new-row td {
    background: rgba(76, 175, 80, 0.1);
    border-color: var(--success-color);
}

.data-row.deleted-row {
    opacity: 0.5;
    text-decoration: line-through;
}

.results-info.enhanced {
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 12px;
}

.info-left,
.info-right {
    display: flex;
    gap: var(--spacing-md);
}

.info-item {
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Context Menu Enhancements */
.context-menu {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 4px 0;
    min-width: 160px;
    font-size: 12px;
    z-index: 1000;
}

.context-menu-item {
    padding: 6px 12px;
    cursor: pointer;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.context-menu-item:hover {
    background: var(--bg-hover);
}

.context-menu-separator {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
}

/* Enhanced Button Styles */
.btn.btn-sm {
    padding: 4px 8px;
    font-size: 11px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn.btn-sm:hover {
    background: var(--bg-hover);
}

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

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

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

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

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

/* Cell Editing */
.data-cell.editing input {
    width: 100%;
    background: var(--bg-primary);
    border: 2px solid var(--accent-primary);
    color: var(--text-primary);
    padding: 2px 4px;
    font-family: var(--font-mono);
    font-size: 13px;
}

.data-cell.editing input:focus {
    outline: none;
}

/* Responsive Enhancements */
@media (max-width: 768px) {
    .table-toolbar.enhanced {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-sm);
    }
    
    .table-controls {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .filter-input {
        width: 100%;
    }
    
    .table-container.scrollable {
        max-height: 400px;
    }
    
    .info-left,
    .info-right {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}

/* AG Grid Styles */
.ag-grid-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.ag-grid-toolbar {
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.table-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

.filter-input {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 4px 8px;
    border-radius: var(--border-radius);
    font-size: 12px;
    width: 200px;
}

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

.ag-theme-balham-dark {
    --ag-background-color: var(--bg-secondary);
    --ag-header-background-color: var(--bg-tertiary);
    --ag-odd-row-background-color: var(--bg-secondary);
    --ag-even-row-background-color: rgba(255, 255, 255, 0.02);
    --ag-row-hover-color: var(--bg-hover);
    --ag-selected-row-background-color: var(--accent-primary);
    --ag-border-color: var(--border-color);
    --ag-header-foreground-color: var(--text-primary);
    --ag-data-color: var(--text-primary);
    --ag-secondary-foreground-color: var(--text-secondary);
    --ag-input-focus-box-shadow: 0 0 0 2px var(--accent-primary);
    --ag-font-family: var(--font-family);
    border: 1px solid var(--border-color);
}

.ag-theme-balham-dark .ag-cell {
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 4px 8px;
    line-height: 1.4;
}

.ag-theme-balham-dark .ag-header-cell {
    border-right: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    font-weight: 600;
    padding: 6px 8px;
}

.ag-theme-balham-dark .ag-header-cell-text {
    color: var(--text-primary);
}

.ag-theme-balham-dark .ag-cell-focus {
    border: 2px solid var(--accent-primary) !important;
    background-color: rgba(0, 122, 204, 0.1) !important;
}

.ag-theme-balham-dark .ag-cell-inline-editing {
    background-color: var(--bg-primary) !important;
    border: 2px solid var(--accent-primary) !important;
}

.ag-theme-balham-dark .ag-cell-edit-input {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    outline: none;
    width: 100%;
    height: 100%;
    padding: 2px 4px;
}

/* Row selection like DBeaver */
.ag-theme-balham-dark .ag-row-selected {
    background-color: rgba(0, 122, 204, 0.3) !important;
}

.ag-theme-balham-dark .ag-row-hover {
    background-color: var(--bg-hover) !important;
}

/* Column hover like DBeaver */
.ag-theme-balham-dark .ag-header-cell:hover {
    background-color: var(--bg-hover);
}

.ag-theme-balham-dark .row-number-cell {
    background-color: var(--bg-tertiary) !important;
    font-weight: 600;
    text-align: center;
    border-right: 2px solid var(--border-color) !important;
}

.ag-theme-balham-dark .data-cell {
    padding: var(--spacing-xs);
}

.ag-theme-balham-dark .null-value {
    color: var(--text-muted);
    font-style: italic;
}

.ag-theme-balham-dark .ag-cell-focus {
    border: 2px solid var(--accent-primary) !important;
}

.ag-theme-balham-dark .ag-cell-inline-editing {
    background-color: var(--bg-hover) !important;
    border: 2px solid var(--accent-primary) !important;
}

/* Enhanced AG Grid scrollbars */
.ag-theme-balham-dark .ag-body-horizontal-scroll {
    background: var(--bg-tertiary);
}

.ag-theme-balham-dark .ag-body-vertical-scroll {
    background: var(--bg-tertiary);
}

.ag-theme-balham-dark .ag-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--border-radius);
}

.ag-theme-balham-dark .ag-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* AG Grid Visual State Management - แสดงสถานะการเปลี่ยนแปลงของข้อมูล */

/* เซลล์ที่ถูกแก้ไข (DBeaver-style) */
.ag-row .ag-cell.cell-dirty {
    background-color: #3a3a20 !important; /* สีเหลืองเข้มสำหรับเซลล์ที่แก้ */
    border-left: 3px solid var(--warning-color) !important;
}

/* แถวใหม่ที่เพิ่งเพิ่มเข้ามา */
.ag-row.ag-row-new {
    background-color: #203a20 !important; /* สีเขียวเข้มสำหรับแถวใหม่ */
    border-left: 5px solid var(--success-color) !important;
}

/* แถวที่ถูกแก้ไข */
.ag-row.ag-row-modified {
    background-color: #3a3020 !important; /* สีเหลืองเข้มสำหรับแถวที่แก้ไข */
    border-left: 5px solid var(--warning-color) !important;
}

/* แถวใหม่ที่ถูกเลือก */
.ag-row.ag-row-new.ag-row-selected {
    background-color: #2a4a2a !important;
}

/* แถวที่แก้ไขและถูกเลือก */
.ag-row.ag-row-modified.ag-row-selected {
    background-color: #4a4030 !important;
}

/* แถวที่ถูกมาร์คให้ลบ */
.ag-row.ag-row-deleted {
    background-color: rgba(244, 67, 54, 0.15) !important;
    border-left: 5px solid #f44336 !important;
    text-decoration: line-through;
    opacity: 0.7;
}

/* แถวที่ถูกมาร์คให้ลบและถูกเลือก */
.ag-row.ag-row-deleted.ag-row-selected {
    background-color: rgba(244, 67, 54, 0.25) !important;
}

/* เซลล์ที่มีการเปลี่ยนแปลงและถูกโฟกัส */
.ag-row .ag-cell.cell-dirty.ag-cell-focus {
    background-color: #4a4a30 !important;
    border: 2px solid var(--warning-color) !important;
}

/* ปุ่ม Save Changes ที่ active */
.btn.btn-warning:not(:disabled) {
    background-color: var(--warning-color) !important;
    border-color: var(--warning-color) !important;
    animation: pulse-save 1.5s infinite;
}

@keyframes pulse-save {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

/* Explain Plan Styles */
.explain-plan-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.explain-header {
    background: var(--bg-tertiary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

/* Modern Table Styles */
.modern-table {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    margin-bottom: var(--spacing-lg);
}

.modern-table-header {
    background: linear-gradient(145deg, var(--bg-tertiary), var(--bg-hover));
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 2px solid var(--accent-primary);
}

.modern-table-header h3 {
    color: var(--accent-primary);
    margin: 0;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.modern-table-content {
    padding: var(--spacing-lg);
}

/* Modern Form Styles */
.modern-form {
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.form-section {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.form-section h4 {
    color: var(--accent-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

/* Input Styles */
.modern-input {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 13px;
    transition: all 0.3s ease;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.modern-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.2), inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

/* Select Styles */
.modern-select {
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 13px;
    transition: all 0.3s ease;
    cursor: pointer;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2);
}

.modern-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 204, 0.2);
}

/* Toolbar Styles */
.modern-toolbar {
    background: linear-gradient(145deg, var(--bg-tertiary), var(--bg-hover));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    margin-bottom: var(--spacing-md);
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Status Indicators */
.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.status-success {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
    border: 1px solid #4caf50;
}

.status-warning {
    background: rgba(255, 152, 0, 0.2);
    color: #ff9800;
    border: 1px solid #ff9800;
}

.status-error {
    background: rgba(244, 67, 54, 0.2);
    color: #f44336;
    border: 1px solid #f44336;
}

.status-info {
    background: rgba(33, 150, 243, 0.2);
    color: #2196f3;
    border: 1px solid #2196f3;
}

.explain-header h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.explain-content {
    flex: 1;
    overflow: auto;
    padding: var(--spacing-md);
}

.explain-text {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.4;
    white-space: pre-wrap;
    word-wrap: break-word;
    border: 1px solid var(--border-color);
    margin: 0;
}

/* Results Message Styles */
.results-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--spacing-xl);
    text-align: center;
}

.results-message p {
    margin: var(--spacing-sm) 0;
    font-size: 14px;
}

.results-message p:first-child {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 16px;
}

/* Enhanced Button States */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: var(--bg-secondary) !important;
    color: var(--text-muted) !important;
    border-color: var(--border-color) !important;
}

.btn:disabled:hover {
    transform: none;
}

/* Transaction Button Colors */
.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background-color: #45a049;
    border-color: #45a049;
}

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

.btn-warning:hover:not(:disabled) {
    background-color: #e68900;
    border-color: #e68900;
}

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

.btn-info:hover:not(:disabled) {
    background-color: #1976d2;
    border-color: #1976d2;
}

/* Import Summary Styles */
.import-stats {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin: var(--spacing-md) 0;
    border: 1px solid var(--border-color);
}

.stat-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin: var(--spacing-xs) 0;
}

.stat-label {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 140px;
}

.stat-value {
    font-weight: 500;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.9em;
}

.stat-value.success {
    color: var(--success-color);
    background: rgba(76, 175, 80, 0.1);
}

.stat-value.error {
    color: var(--error-color);
    background: rgba(244, 67, 54, 0.1);
}

.stat-value.muted {
    color: var(--text-muted);
}

.stat-divider {
    color: var(--text-muted);
    margin: 0 2px;
}

.error-details {
    margin-top: var(--spacing-md);
    border: 1px solid var(--error-color);
    border-radius: var(--border-radius);
    background: rgba(244, 67, 54, 0.05);
}

.error-details summary {
    padding: var(--spacing-sm);
    cursor: pointer;
    background: rgba(244, 67, 54, 0.1);
    color: var(--error-color);
    font-weight: 500;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.error-details summary:hover {
    background: rgba(244, 67, 54, 0.15);
}

.error-list {
    margin: 0;
    padding: var(--spacing-sm);
    list-style: none;
    max-height: 200px;
    overflow-y: auto;
}

.error-list li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid rgba(244, 67, 54, 0.1);
    font-family: var(--font-mono);
    font-size: 0.85em;
    color: var(--text-secondary);
}

.error-list li:last-child {
    border-bottom: none;
}

.success-text {
    color: var(--success-color);
    font-weight: 500;
}

/* Dropdown Menu Styles for Toolbar */
.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-button {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 13px;
    transition: all 0.2s;
    min-width: 100px;
    justify-content: space-between;
}

.dropdown-button:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

.dropdown-button.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.dropdown-arrow {
    font-size: 10px;
    transition: transform 0.2s;
}

.dropdown.open .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 2px);
    left: 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    min-width: 180px;
    display: none;
}

.dropdown.open .dropdown-menu {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: none;
    color: var(--text-primary);
    cursor: pointer;
    width: 100%;
    text-align: left;
    font-size: 13px;
    transition: background-color 0.2s;
}

.dropdown-item:hover {
    background: var(--bg-hover);
}

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

.dropdown-item:disabled:hover {
    background: none;
}

.dropdown-separator {
    height: 1px;
    background: var(--border-color);
    margin: var(--spacing-xs) 0;
}

/* Toolbar Improvements */
.editor-toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.toolbar-separator {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 var(--spacing-xs);
}

.toolbar-spacer {
    flex: 1;
}

/* ============================================================================
   RESPONSIVE TOOLBAR LAYOUTS
   ============================================================================
   
   @component ResponsiveToolbar
   @description Adaptive toolbar layouts for different screen sizes
   @purpose Ensure toolbar usability across desktop, tablet, and mobile
   @breakpoints 1200px (laptop), 768px (tablet/mobile)
   
   @behavior-1200px
   - Remove toolbar spacer for tighter layout
   - Maintain horizontal button grouping
   - Optimize for laptop screens
   
   @behavior-768px
   - Stack toolbar vertically
   - Full-width buttons
   - Center-aligned button groups
   - Increased touch targets
   
   @features
   - Progressive enhancement approach
   - Smooth responsive transitions
   - Maintained functionality across sizes
   - Touch-friendly mobile interface
   ============================================================================ */

/* Responsive Toolbar */
@media (max-width: 1200px) {
    .editor-toolbar {
        justify-content: flex-start;
    }
    
    .toolbar-spacer {
        display: none;
    }
}

@media (max-width: 768px) {
    .editor-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-xs);
    }
    
    .toolbar-group {
        justify-content: center;
    }
    
    .dropdown-button {
        min-width: auto;
        flex: 1;
    }
}

/* ============================================================================
   Z-INDEX SYSTEM SUMMARY
   ============================================================================
   
   @summary Z-Index Management
   @description Centralized z-index system using CSS custom properties
   @purpose Eliminate z-index conflicts and provide clear stacking hierarchy
   
   @hierarchy (from lowest to highest)
   --z-base: 1           Base level elements
   --z-dropdown: 1000    Dropdowns, select options
   --z-sticky: 1001      Sticky headers, fixed navigation
   --z-overlay: 9000     Background overlays, loading screens
   --z-modal: 10000      Modal dialogs (legacy support)
   --z-popover: 11000    Context menus, popovers
   --z-tooltip: 12000    Tooltips (highest interactive elements)
   
   @native-dialogs
   <dialog> elements use browser-managed stacking context
   No manual z-index required - automatically above all other content
   Recommended for new modal implementations
   
   @migration-path
   1. New modals: Use <dialog class="app-dialog">
   2. Existing modals: Gradually migrate to dialog elements
   3. Context menus: Use --z-popover for consistent stacking
   4. Loading overlays: Use --z-overlay to stay below modals
   
   @best-practices
   - Always use CSS custom properties for z-index values
   - Prefer native <dialog> for new modal implementations
   - Test stacking order across different UI states
   - Document any exceptions to the standard hierarchy
   ============================================================================ */