/* ============================================
   MODERN DATA WORKSPACE THEME
   Inspired by VS Code, Tableau, Jupyter, Dataiku
   Professional SaaS Application Design
   ============================================ */

:root {
  /* Dark theme colors - professional SaaS palette */
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2128;
  --bg-elevated: #21262d;
  --bg-hover: #1f2329;
  --bg-active: #2d333b;
  
  --border-primary: #30363d;
  --border-secondary: #21262d;
  --border-hover: #484f58;
  
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;
  --text-disabled: #484f58;
  
  --accent-primary: #58a6ff;
  --accent-secondary: #1f6feb;
  --accent-hover: #79c0ff;
  --accent-active: #388bfd;
  
  --success: #3fb950;
  --warning: #d29922;
  --error: #f85149;
  --info: #58a6ff;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
  
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;
  
  --transition-fast: 0.1s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
  
  /* Quality colors */
  --quality-excellent: #22c55e;
  --quality-good: #60a5fa;
  --quality-fair: #fbbf24;
  --quality-poor: #ef4444;
  
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Droid Sans Mono', 'Source Code Pro', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
}

/* Bridge to shared DW tokens */
:root {
  --dw-bg: var(--bg-primary);
  --dw-bg-elevated: var(--bg-elevated, var(--bg-secondary));
  --dw-bg-muted: var(--bg-tertiary);
  --dw-surface: var(--bg-secondary);
  --dw-surface-strong: var(--bg-elevated, #21262d);
  --dw-border: var(--border-primary);
  --dw-border-strong: var(--border-hover);
  --dw-text: var(--text-primary);
  --dw-text-muted: var(--text-secondary);
  --dw-accent: var(--accent-primary);
  --dw-accent-strong: var(--accent-active);
  --dw-success: var(--success);
  --dw-danger: var(--error);
  --dw-warning: var(--warning);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
}

/* When unified workspace exists, apply fixed layout but below header */
.unified-workspace {
  top: 80px; /* Below header */
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 100; /* Below header (z-index: 1000) */
  display: grid;
  grid-template-rows: auto 1fr auto;
}

/* Allow scrolling for regular content when workspace is not active */
.data-workspace-content {
  overflow-y: auto;
  overflow-x: hidden;
}

/* Hide old content when unified workspace is active */
.unified-workspace ~ * .studio-hero,
.unified-workspace ~ * .tools-container,
.unified-workspace ~ * .workspace-section:not(.unified-workspace),
.unified-workspace ~ * .info-section {
  display: none !important;
}

/* When unified workspace exists, hide old sections */
body:has(.unified-workspace) .studio-hero,
body:has(.unified-workspace) .tools-container,
body:has(.unified-workspace) .workspace-section:not(.unified-workspace),
body:has(.unified-workspace) .info-section {
  display: none !important;
}

/* Direct hide for old content sections when workspace is active */
.hidden-by-workspace,
.unified-workspace ~ * .studio-hero,
.unified-workspace ~ * .tools-container,
.unified-workspace ~ * .workspace-section:not(.unified-workspace),
.unified-workspace ~ * .info-section {
  display: none !important;
}

/* ============================================
   DESKTOP APPLICATION MENU BAR
   VS Code / Tableau inspired
   ============================================ */
.desktop-menu-bar {
  display: flex;
  align-items: center;
  height: 32px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  padding: 0;
  user-select: none;
  -webkit-app-region: drag;
  position: relative;
  z-index: 1000;
}

.menu-bar-left {
  display: flex;
  align-items: center;
  height: 100%;
  -webkit-app-region: no-drag;
}

.menu-logo {
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  height: 100%;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  border-right: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  letter-spacing: 0.02em;
}

.menu-nav {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 0;
}

.menu-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0 var(--spacing-xl);
  height: 100%;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: transparent;
}

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

.menu-item.active {
  background: var(--bg-active);
  color: var(--text-primary);
}

.menu-label {
  font-weight: 500;
}

.menu-arrow {
  font-size: 0.625rem;
  opacity: 0.6;
  transition: transform var(--transition-fast);
}

.menu-item.active .menu-arrow {
  transform: rotate(180deg);
}

/* Dropdown menus */
.menu-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 280px;
  max-width: 400px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-sm) 0;
  display: none;
  z-index: 1001;
  margin-top: 6px;
}

/* ============================================
   Custom Model Creator - Dark Mode UI
   ============================================ */
.model-creator-container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 16px);
  padding: var(--spacing-md, 16px);
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, 0.4));
  overflow-y: auto;
  padding-bottom: calc(var(--spacing-md, 16px) + 8px);
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-md, 16px);
}

.model-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-md, 16px);
  min-height: 0;
}

.model-creator-container.is-training #configCard {
  display: none !important;
}

.model-column {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 16px);
  min-height: 0;
}

.model-column.wide {
  gap: var(--spacing-md, 16px);
}

.model-header {
  align-items: flex-start;
}

.header-titles h3 {
  margin-bottom: 0.15rem;
}

.model-card {
  background: var(--bg-tertiary, #1c2128);
  border: 1px solid var(--border-primary, #30363d);
  border-radius: var(--radius-lg, 12px);
  padding: var(--spacing-md, 16px);
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.3));
  position: relative;
  overflow: visible;
}

.model-card .label {
  color: var(--text-secondary, #8b949e);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.15rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm, 8px);
  margin-bottom: var(--spacing-sm, 8px);
}

.dataset-card .dataset-status {
  color: var(--text-primary, #e6edf3);
  font-weight: 600;
}

.hint {
  color: var(--text-tertiary, #6e7681);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

.config-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-md, 16px);
}

.model-card .tool-select,
.model-card .tool-input {
  background: var(--bg-primary, #0d1117);
  border: 1px solid var(--border-primary, #30363d);
  color: var(--text-primary, #e6edf3);
  border-radius: var(--radius-md, 8px);
}

.model-card .tool-select:focus,
.model-card .tool-input:focus {
  border-color: var(--accent-primary, #58a6ff);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.18);
}

.model-card .btn-tool {
  background: var(--bg-active, #2d333b);
  border-color: var(--border-primary, #30363d);
  color: var(--text-primary, #e6edf3);
}

.model-card .btn-tool.btn-primary {
  background: var(--accent-primary, #58a6ff);
  border-color: var(--accent-primary, #58a6ff);
  color: #0b1220;
}

.model-card .btn-tool.btn-secondary {
  background: var(--bg-hover, #1f2329);
}

.model-card .btn-tool:disabled {
  opacity: 0.6;
}

/* Remove stray focus artifacts on cards and buttons */
.model-card:focus,
.model-card:focus-visible {
  outline: none;
}

.model-card .btn-tool:focus,
.model-card .btn-tool:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.25);
}

.status-text {
  background: var(--bg-elevated, #21262d);
  border: 1px solid var(--border-primary, #30363d);
  border-radius: var(--radius-md, 8px);
  padding: 0.75rem;
  color: var(--text-primary, #e6edf3);
  font-family: var(--font-mono, 'SF Mono', monospace);
}

.pill-row {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
  flex-wrap: wrap;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary, #e6edf3);
  border: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.75rem;
  line-height: 1.1;
}

.status-pill.subtle {
  background: var(--bg-elevated, #21262d);
  color: var(--text-secondary, #8b949e);
  border-color: var(--border-primary, #30363d);
}

.status-pill.pill-success {
  background: rgba(63, 185, 80, 0.16);
  color: #c6f6d5;
  border-color: rgba(63, 185, 80, 0.35);
}

.status-pill.pill-warning {
  background: rgba(210, 153, 34, 0.16);
  color: #fcd34d;
  border-color: rgba(210, 153, 34, 0.35);
}

.chart-card {
  min-height: 200px;
  max-height: 420px;
  overflow: hidden;
}

.chart-card canvas {
  width: 100% !important;
  height: auto !important;
  aspect-ratio: 16 / 10;
  max-height: 380px;
  display: block;
}

.card-overlay {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 0.5rem;
  background: rgba(13, 17, 23, 0.65);
  backdrop-filter: blur(3px);
  border-radius: inherit;
  z-index: 5;
}

.loader {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 3px solid rgba(88, 166, 255, 0.25);
  border-top-color: #58a6ff;
  animation: spin 0.8s linear infinite;
}

.overlay-text {
  color: var(--text-primary, #e6edf3);
  font-weight: 600;
  letter-spacing: 0.01em;
}

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

.menu-item.active .menu-dropdown {
  display: block;
}

.menu-dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  background: transparent;
  text-align: left;
  width: 100%;
  margin: 0 var(--spacing-xs);
  border-radius: var(--radius-sm);
}

.menu-dropdown-item:hover {
  background: var(--bg-hover);
  transform: translateX(2px);
}

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

.menu-item-icon {
  font-size: 1.25rem;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  opacity: 0.8;
}

.menu-item-content {
  flex: 1;
  min-width: 0;
}

.menu-item-title {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
  line-height: 1.4;
}

.menu-item-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Menu bar right */
.menu-bar-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-left: auto;
  padding: 0 var(--spacing-md);
  height: 100%;
  -webkit-app-region: no-drag;
}

.header-btn {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  height: 24px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.header-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.header-btn.active {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

.active-dataset-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  height: 24px;
  font-size: 0.75rem;
  background: rgba(63, 185, 80, 0.1);
  border: 1px solid rgba(63, 185, 80, 0.2);
  border-radius: var(--radius-sm);
  color: var(--success);
}

.active-dataset-indicator .indicator-dot {
  width: 6px;
  height: 6px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 4px rgba(63, 185, 80, 0.6);
}

/* ============================================
   WORKSPACE LAYOUT
   ============================================ */
.unified-workspace {
  display: grid;
  grid-template-rows: auto 1fr auto;
  background: var(--bg-primary);
}

.workspace-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: 100%;
  overflow: hidden;
}

.workspace-grid.sidebar-collapsed {
  grid-template-columns: 0 1fr;
}

/* Sidebar */
.workspace-sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.sidebar-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.sidebar-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.sidebar-section {
  border-bottom: 1px solid var(--border-primary);
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.sidebar-section-header:hover {
  background: var(--bg-hover);
}

.sidebar-section-header h4 {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0;
}

.sidebar-section-toggle {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  transition: transform var(--transition-fast);
}

.sidebar-section.collapsed .sidebar-section-toggle {
  transform: rotate(-90deg);
}

.sidebar-section-content {
  padding: var(--spacing-xs);
}

.sidebar-section.collapsed .sidebar-section-content {
  display: none;
}

/* Main workspace */
.workspace-main {
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  overflow: hidden;
}

.workspace-tabs {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  padding: 0 var(--spacing-sm);
  gap: var(--spacing-xs);
  overflow-x: auto;
  overflow-y: hidden;
  min-height: 36px;
}

.workspace-tab {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-width: 120px;
  max-width: 200px;
}

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

.workspace-tab.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.workspace-tab-close {
  padding: 2px;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  opacity: 0;
  transition: all var(--transition-fast);
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.workspace-tab:hover .workspace-tab-close {
  opacity: 1;
}

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

.workspace-tab-icon {
  font-size: 0.875rem;
  flex-shrink: 0;
  opacity: 0.8;
}

.workspace-tab.active .workspace-tab-icon {
  opacity: 1;
}

.workspace-tab-status {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-tertiary);
  flex-shrink: 0;
  transition: background var(--transition-fast);
}

.workspace-tab-status[data-status="ready"] {
  background: var(--success);
}

.workspace-tab-status[data-status="loading"] {
  background: var(--accent-primary);
  animation: pulse 1.5s ease-in-out infinite;
}

.workspace-tab-status[data-status="error"] {
  background: var(--error);
}

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

.workspace-tab.dragging {
  opacity: 0.5;
}

/* Tab Context Menu */
.tab-context-menu {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-xs) 0;
  min-width: 180px;
  z-index: 10000;
}

.context-menu-item {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.8125rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: background var(--transition-fast);
}

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

.context-menu-separator {
  height: 1px;
  background: var(--border-primary);
  margin: var(--spacing-xs) 0;
}

.tool-viewport {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-primary);
}

/* Status bar */
.workspace-status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-primary);
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-height: 24px;
}

.status-bar-left,
.status-bar-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.status-bar-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.status-bar-item-label {
  color: var(--text-tertiary);
}

.status-bar-item-value {
  color: var(--text-primary);
  font-weight: 500;
}

/* ============================================
   BUTTONS & CONTROLS
   ============================================ */
.btn-tool {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-primary);
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-tool:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
}

.btn-tool.btn-primary {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
}

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

.btn-tool.btn-secondary {
  background: var(--bg-elevated);
  border-color: var(--border-primary);
}

/* ============================================
   MODALS
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

.modal-content {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

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

.modal-header h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

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

.modal-body {
  padding: var(--spacing-lg);
  overflow-y: auto;
  color: var(--text-primary);
}

/* Dataset picker */
.dataset-picker-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.dataset-picker-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dataset-picker-item:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
}

.picker-item-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

.picker-item-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ============================================
   LOADING OVERLAY
   ============================================ */
#workspaceLoadingOverlay {
  position: fixed;
  inset: 0;
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 99999;
}

#workspaceLoadingOverlay.visible {
  opacity: 1;
  pointer-events: all;
}

.loading-overlay-subtext {
  margin-top: 6px;
  color: var(--text-muted, #9ca3af);
  font-size: 0.85rem;
}

.loading-overlay-list {
  margin-top: 12px;
  width: 100%;
  max-width: 360px;
  display: grid;
  gap: 6px;
}

.loading-overlay-list .loading-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px;
  align-items: center;
  padding: 8px 10px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-primary, #e5e7eb);
}

.loading-item .spinner-small {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.15);
  border-top-color: var(--primary, #60a5fa);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

.loading-item .status {
  font-size: 0.85rem;
  color: var(--text-muted, #9ca3af);
}

.loading-item .status.done {
  color: var(--success, #22c55e);
}

.loading-item .status.error {
  color: var(--danger, #ef4444);
}

.loading-overlay-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-xl);
  min-width: 240px;
}

.loading-overlay-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-primary);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-overlay-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ============================================
   SCROLLBARS
   ============================================ */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--bg-elevated);
  border-radius: 5px;
  border: 2px solid var(--bg-secondary);
}

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

/* ============================================
   EMPTY STATE
   ============================================ */
.tool-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: var(--spacing-2xl);
  text-align: center;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.tool-empty-state h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--spacing-sm) 0;
}

.tool-empty-state p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin: var(--spacing-xs) 0;
}

.empty-state-hint {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  font-style: italic;
  margin-top: var(--spacing-md);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
  
  .workspace-sidebar {
    position: fixed;
    left: 0;
    top: 32px;
    bottom: 0;
    width: 280px;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }
  
  .workspace-sidebar.open {
    transform: translateX(0);
  }
}

/* ============================================
   EXPORT DIALOG
   ============================================ */
.export-dialog-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

.export-dialog {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.export-dialog-header h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

.export-dialog-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

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

.export-dialog-body {
  padding: var(--spacing-xl);
  flex: 1;
  overflow-y: auto;
}

.export-column-selection-section {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-primary);
}

.export-column-selection-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

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

.export-column-actions .btn-small {
  padding: 0.25rem 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.75rem;
  transition: all var(--transition-fast);
}

.export-column-actions .btn-small:hover {
  background: var(--bg-hover);
  border-color: var(--accent-primary);
}

.export-column-selection-count {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.export-column-search {
  margin-bottom: var(--spacing-md);
}

.export-search-input {
  width: 100%;
  padding: 0.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.export-search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 2px rgba(88, 166, 255, 0.1);
}

.export-column-list {
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  background: var(--bg-tertiary);
}

.export-column-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.export-column-checkbox:hover {
  background: var(--bg-hover);
}

.export-column-checkbox-input {
  margin: 0;
  cursor: pointer;
}

.export-column-name {
  flex: 1;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.export-format-section,
.export-column-section,
.export-column-format-section {
  margin-bottom: var(--spacing-xl);
}

.export-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.export-format-options {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.export-option {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.export-option:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
}

.export-option input[type="radio"] {
  margin: 0;
  cursor: pointer;
}

.export-option span {
  font-size: 0.875rem;
  color: var(--text-primary);
  flex: 1;
}

.export-select {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.export-select:hover {
  border-color: var(--border-hover);
}

.export-select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

.export-dialog-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
  padding: var(--spacing-lg) var(--spacing-xl);
  border-top: 1px solid var(--border-primary);
}

.export-dialog-footer .btn-primary,
.export-dialog-footer .btn-secondary {
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.export-dialog-footer .btn-primary {
  background: var(--accent-primary);
  color: #ffffff;
}

.export-dialog-footer .btn-primary:hover {
  background: var(--accent-hover);
}

.export-dialog-footer .btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-primary);
}

.export-dialog-footer .btn-secondary:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
}

.export-status-notification {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 10001;
  display: none;
}

.export-status-notification.success {
  background: var(--success);
  color: #ffffff;
}

.export-status-notification.error {
  background: var(--error);
  color: #ffffff;
}

.export-status-notification.info {
  background: var(--info);
  color: #ffffff;
}

/* ============================================
   SKELETON LOADING STATES
   ============================================ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-elevated) 0%,
    var(--bg-hover) 50%,
    var(--bg-elevated) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--spacing-sm);
}

.skeleton-text:last-child {
  margin-bottom: 0;
}

.skeleton-text.short {
  width: 60%;
}

.skeleton-text.medium {
  width: 80%;
}

.skeleton-text.long {
  width: 100%;
}

.skeleton-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.skeleton-card .skeleton-text {
  margin-bottom: var(--spacing-md);
}

.skeleton-overview-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.skeleton-overview-card .skeleton-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
}

.skeleton-overview-card .skeleton-content {
  flex: 1;
}

.skeleton-overview-card .skeleton-text {
  margin-bottom: var(--spacing-xs);
}

/* ============================================
   SMOOTH TRANSITIONS & ANIMATIONS
   ============================================ */
.fade-in {
  animation: fadeIn var(--transition-base) ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-in {
  animation: slideIn var(--transition-slow) ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Smooth view transitions */
.view-transition {
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.view-transition.entering {
  opacity: 0;
  transform: translateY(8px);
}

.view-transition.entered {
  opacity: 1;
  transform: translateY(0);
}

.view-transition.exiting {
  opacity: 0;
  transform: translateY(-8px);
}

/* ============================================
   ENHANCED EMPTY STATES
   ============================================ */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.empty-state-description {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.empty-state-action {
  margin-top: var(--spacing-lg);
}

/* ============================================
   KEYBOARD SHORTCUT HINTS
   ============================================ */
.keyboard-shortcut {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-left: var(--spacing-sm);
}

.keyboard-key {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

/* ============================================
   IMPROVED VISUAL HIERARCHY
   ============================================ */
.card-elevated {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.card-elevated:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

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

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.section-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
}

/* ============================================
   LOADING STATE IMPROVEMENTS
   ============================================ */
.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  min-height: 200px;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--bg-elevated);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: var(--spacing-md);
}

.loading-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ============================================
   DATASET PREVIEW TABLE
   ============================================ */
.dataset-preview-container {
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.dataset-preview-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  min-height: 400px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
}

.dataset-preview-loading .loading-spinner {
  margin-bottom: var(--spacing-md);
}

.dataset-view-section {
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--text-secondary);
}

/* D3 Chart Tooltip Styles - Enhanced for dark mode */
.d3-tooltip {
  position: absolute;
  pointer-events: none;
  opacity: 0;
  background: var(--dw-surface-strong, #1c2128);
  border: 1px solid var(--dw-border, #30363d);
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--dw-text, #e6edf3);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(88, 166, 255, 0.1);
  z-index: 10000;
  font-family: var(--font-sans, system-ui, sans-serif);
  line-height: 1.5;
  transition: opacity 0.2s ease;
  max-width: 250px;
  backdrop-filter: blur(8px);
}

.d3-tooltip strong {
  color: var(--dw-accent, #58a6ff);
  font-weight: 600;
}

.d3-tooltip br {
  margin: 2px 0;
}