:root {
  /* ========================================
     Meta Theme
     Facebook / Meta Design System
     Clean, accessible, friendly UI
     ======================================== */

  /* Core spacing scale - generous for touch-friendly UI */
  --node-editor-space-xs: 4px;
  --node-editor-space-sm: 8px;
  --node-editor-space-md: 12px;
  --node-editor-space-lg: 16px;
  --node-editor-space-xl: 20px;
  --node-editor-space-xxl: 24px;

  /* Layout spacing */
  --node-editor-control-padding: var(--node-editor-space-sm) var(--node-editor-space-md);

  /* Inspector spacing system */
  --node-editor-inspector-space-xs: var(--node-editor-space-xs);
  --node-editor-inspector-space-sm: var(--node-editor-space-sm);
  --node-editor-inspector-space-md: var(--node-editor-space-md);
  --node-editor-inspector-space-lg: var(--node-editor-space-lg);
  --node-editor-inspector-space-xl: var(--node-editor-space-xl);
  --node-editor-inspector-space-xxl: var(--node-editor-space-xxl);
  --node-editor-inspector-content-padding: var(--node-editor-inspector-space-lg);
  --node-editor-inspector-header-padding-top: var(--node-editor-inspector-space-md);
  --node-editor-inspector-header-padding-bottom: var(--node-editor-inspector-space-md);
  --node-editor-inspector-header-gap: var(--node-editor-inspector-space-sm);
  --node-editor-inspector-section-gap: var(--node-editor-inspector-space-lg);
  --node-editor-inspector-field-gap: var(--node-editor-inspector-space-md);
  --node-editor-inspector-inline-gap: var(--node-editor-inspector-space-sm);
  --node-editor-inspector-empty-padding-vertical: var(--node-editor-inspector-space-xxl);
  --node-editor-inspector-empty-padding-horizontal: var(--node-editor-inspector-space-lg);
  --node-editor-inspector-input-padding: var(--node-editor-space-sm) var(--node-editor-space-md);

  /* Inspector typography - readable sizes */
  --node-editor-inspector-font-size-title: 0.9375rem;
  --node-editor-inspector-line-height-title: 1.4;
  --node-editor-inspector-font-size-body: 0.875rem;
  --node-editor-inspector-line-height-body: 1.5;
  --node-editor-inspector-font-size-meta: 0.8125rem;
  --node-editor-inspector-line-height-meta: 1.4;
  --node-editor-inspector-font-weight-medium: 600;
  --node-editor-inspector-font-size-heading: 1rem;
  --node-editor-inspector-font-size: var(--node-editor-inspector-font-size-body);
  --node-editor-inspector-line-height: var(--node-editor-inspector-line-height-body);

  /* Inspector icon button tokens - Meta style */
  --node-editor-inspector-icon-button-size: 32px;
  --node-editor-inspector-icon-button-size-sm: 28px;
  --node-editor-inspector-icon-button-icon-size: 18px;
  --node-editor-inspector-icon-button-icon-size-sm: 16px;
  --node-editor-inspector-icon-button-color: #65676b;
  --node-editor-inspector-icon-button-color-hover: #050505;
  --node-editor-inspector-icon-button-color-active: #0866ff;
  --node-editor-inspector-icon-button-color-disabled: #bcc0c4;
  --node-editor-inspector-icon-button-background: transparent;
  --node-editor-inspector-icon-button-background-hover: #e4e6eb;
  --node-editor-inspector-icon-button-background-active: #e7f3ff;

  /* Inspector input with label tokens - Meta style */
  --node-editor-inspector-input-label-width: auto;
  --node-editor-inspector-input-label-min-width: 48px;
  --node-editor-inspector-input-label-color: #65676b;
  --node-editor-inspector-input-label-font-size: 0.8125rem;
  --node-editor-inspector-input-label-font-weight: 500;

  /* Inspector segment control tokens - Meta style */
  --node-editor-inspector-segment-border-radius: 6px;
  --node-editor-inspector-segment-gap: 0;
  --node-editor-inspector-segment-padding: 3px;
  --node-editor-inspector-segment-background: #e4e6eb;
  --node-editor-inspector-segment-button-background: transparent;
  --node-editor-inspector-segment-button-background-hover: rgba(0, 0, 0, 0.05);
  --node-editor-inspector-segment-button-background-active: #ffffff;
  --node-editor-inspector-segment-button-color: #65676b;
  --node-editor-inspector-segment-button-color-hover: #050505;
  --node-editor-inspector-segment-button-color-active: #0866ff;
  --node-editor-inspector-segment-button-shadow-active: 0 1px 3px rgba(0, 0, 0, 0.12);

  /* Font families - System UI stack (Meta uses system fonts) */
  --node-editor-theme-default-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --node-editor-theme-control-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --node-editor-theme-label-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --node-editor-system-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --node-editor-font-mono: "SF Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --node-editor-title-font: 700 1rem/1.3 var(--node-editor-theme-label-font-family);
  --node-editor-subtitle-font: 600 0.9375rem/1.4 var(--node-editor-theme-label-font-family);
  --node-editor-caption-font: 400 0.8125rem/1.4 var(--node-editor-theme-default-font-family);
  --node-editor-control-text-font: 600 0.875rem/1.4 var(--node-editor-theme-control-font-family);
  --node-editor-input-font: 400 0.9375rem/1.5 var(--node-editor-theme-default-font-family);
  --node-editor-font-size-lg: 1.0625rem;
  --node-editor-font-size-sm: 0.875rem;
  --node-editor-font-size-xs: 0.8125rem;

  /* Canvas grid - subtle Meta blue */
  --node-editor-grid-color: #0866ff;
  --node-editor-grid-opacity: 0.04;

  /* Shadow system - soft, friendly */
  --node-editor-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --node-editor-shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --node-editor-shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1), 0 2px 8px rgba(0, 0, 0, 0.06);

  /* Transition system - disabled to avoid node connection conflicts */
  --node-editor-transition-duration: 0s;

  /* Inspector shadows */
  --node-editor-inspector-shadow: -1px 0 0 #dddfe2;
  --node-editor-inspector-header-shadow: 0 1px 0 #dddfe2;

  /* Tree & List Components */
  --node-editor-tree-item-height: 36px;
  --node-editor-tree-indent: 16px;

  /* Control Buttons - touch-friendly sizes */
  --node-editor-control-button-size-sm: 28px;
  --node-editor-control-button-size: 36px;

  /* Icons */
  --node-editor-icon-size-sm: 16px;
  --node-editor-icon-selected-brightness: 1;

  /* Text colors - high contrast for accessibility */
  --node-editor-text-color: #050505;
  --node-editor-text-secondary: #65676b;
  --node-editor-header-text-color: #050505;
  --node-editor-label-color: #050505;
  --node-editor-secondary-label-color: #65676b;
  --node-editor-tertiary-label-color: #8a8d91;
  --node-editor-quaternary-label-color: #bcc0c4;
  --node-editor-control-text-color: #050505;
  --node-editor-control-text-color-primary: #ffffff;
  --node-editor-control-text-color-secondary: #050505;
  --node-editor-control-hover-text-color-primary: #ffffff;
  --node-editor-input-text-color: #050505;
  --node-editor-selected-control-text-color: #ffffff;
  --node-editor-selected-menu-item-text-color: #050505;

  /* Accent colors - Meta Blue */
  --node-editor-accent-color: #0866ff;
  --node-editor-accent-color-hover: #0055d4;
  --node-editor-color-primary: #0866ff;
  --node-editor-keyboard-focus-indicator-color: rgba(8, 102, 255, 0.4);
  --node-editor-success-color: #31a24c;
  --node-editor-warning-color: #f7b928;
  --node-editor-caution-color: #f02849;
  --node-editor-caution-hover-background: rgba(240, 40, 73, 0.08);
  --node-editor-system-orange-color: #f7b928;
  --node-editor-system-red-color: #f02849;
  --node-editor-connection-color: #65676b;

  /* Surface colors - Meta's clean white/gray palette */
  --node-editor-surface-primary: #ffffff;
  --node-editor-surface-secondary: #f0f2f5;
  --node-editor-surface-tertiary: #e4e6eb;
  --node-editor-selected-content-background-color: #e7f3ff;
  --node-editor-selected-control-color: #e7f3ff;
  --node-editor-under-page-background-color: #f0f2f5;
  --node-editor-window-background-color: #ffffff;
  --node-editor-background-surface: #f0f2f5;

  /* Control surfaces - Meta button styling */
  --node-editor-control-background: #e4e6eb;
  --node-editor-control-background-primary: #0866ff;
  --node-editor-control-background-secondary: #e4e6eb;
  --node-editor-control-hover-background: #d8dadf;
  --node-editor-control-hover-background-primary: #0055d4;
  --node-editor-hover-background: rgba(0, 0, 0, 0.04);
  --node-editor-control-box-shadow-primary: none;
  --node-editor-control-box-shadow-secondary: none;
  --node-editor-disabled-control-text-color: #bcc0c4;

  /* Input surfaces - Meta input styling (with subtle border for definition) */
  --node-editor-input-background: #f0f2f5;
  --node-editor-input-border: 1px solid #dddfe2;
  --node-editor-input-border-hover: 1px solid #bcc0c4;
  --node-editor-input-box-shadow: none;
  --node-editor-input-padding: 8px 12px;

  /* Card & panel styling - Meta card design */
  --node-editor-card-border-color: #dddfe2;
  --node-editor-card-border: 1px solid #dddfe2;
  --node-editor-card-border-radius: 8px;
  --node-editor-card-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  --node-editor-card-hover-box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --node-editor-card-elevated-box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
  --node-editor-card-focus-box-shadow: 0 0 0 2px #0866ff;
  --node-editor-card-disabled-background: #f5f6f7;
  --node-editor-card-filled-background: #ffffff;
  --node-editor-card-filled-hover-background: #ffffff;
  --node-editor-card-hover-border-color: #c4c6c9;

  /* Dialogs & overlays - Meta modal design */
  --node-editor-dialog-background: #ffffff;
  --node-editor-dialog-box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(0, 0, 0, 0.04);
  --node-editor-dialog-level-elevation: 1000;

  /* Scrollbars - subtle style */
  --node-editor-scroll-bar-thumb-color: rgba(0, 0, 0, 0.15);
  --node-editor-active-scroll-bar-thumb-color: rgba(0, 0, 0, 0.3);

  /* Selected State Colors */
  --node-editor-selected-secondary-color: #0866ff;
  --node-editor-selected-hover-background: #e7f3ff;

  /* Tables & list accents */
  --node-editor-table-header-background-color: #f0f2f5;
  --node-editor-table-header-background-color-hover: #e4e6eb;
  --node-editor-table-header-background-color-active: #e7f3ff;

  /* Node-specific colors */
  --node-editor-group-node-background: rgba(8, 102, 255, 0.04);
  --node-editor-group-node-border: rgba(8, 102, 255, 0.2);
  --node-editor-group-node-active-background: #e7f3ff;
  --node-editor-group-node-active-color: #0866ff;
  --node-editor-node-port-input-color: #31a24c;
  --node-editor-node-port-output-color: #0866ff;

  /* System fills */
  --node-editor-tertiary-system-background: #e4e6eb;
  --node-editor-tertiary-system-fill-color: #f0f2f5;
  --node-editor-quaternary-system-fill-color: #f5f6f7;

  /* Border Radii - friendly rounded corners (Meta uses 8px) */
  --node-editor-border-radius-xxs: 4px;
  --node-editor-border-radius-xs: 6px;
  --node-editor-radius-xs: 6px;
  --node-editor-radius-sm: 8px;
  --node-editor-radius-md: 12px;
  --node-editor-control-border-radius: 8px;
  --node-editor-segment-control-border-radius: 8px;

  /* Borders */
  --node-editor-border-width: 1px;
  --node-editor-border-color: #dddfe2;
  --node-editor-divider-color: #dddfe2;
  --node-editor-separator-color: #e4e6eb;

  /* Segment controls - Meta pill toggle style */
  --node-editor-segment-backdrop-filter: none;
  --node-editor-segment-control-background: #e4e6eb;
  --node-editor-segment-control-background-color: transparent;
  --node-editor-segment-control-text-color: #65676b;
  --node-editor-segment-control-active-background-color: #ffffff;
  --node-editor-segment-control-active-text-color: #0866ff;
  --node-editor-segment-control-segment-padding: 6px 12px;
  --node-editor-segment-control-hover-background-color: rgba(0, 0, 0, 0.04);
  --node-editor-segment-control-indicator-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);

  /* Tab Navigation - Meta segment control style */
  --node-editor-tab-nav-display: flex;
  --node-editor-tab-nav-direction: row;
  --node-editor-tab-nav-align: stretch;
  --node-editor-tab-nav-justify: flex-start;
  --node-editor-tab-nav-gap: 0;
  --node-editor-tab-nav-width: auto;
  --node-editor-tab-nav-padding: 4px;
  --node-editor-tab-nav-border-radius: 8px;
  --node-editor-tab-nav-background: #e4e6eb;
  --node-editor-tab-nav-border: none;
  --node-editor-tab-nav-box-shadow: none;
  --node-editor-tab-nav-backdrop-filter: none;
  --node-editor-tab-nav-overflow: hidden;

  /* Tab Button - Meta style */
  --node-editor-tab-button-display: flex;
  --node-editor-tab-button-align: center;
  --node-editor-tab-button-justify: center;
  --node-editor-tab-button-flex: 1;
  --node-editor-tab-button-min-width: 36px;
  --node-editor-tab-button-min-height: 32px;
  --node-editor-tab-button-padding: 6px 14px;
  --node-editor-tab-button-margin: 0;
  --node-editor-tab-button-border: none;
  --node-editor-tab-button-border-radius: 6px;
  --node-editor-tab-button-background: transparent;
  --node-editor-tab-button-color: #65676b;
  --node-editor-tab-button-font-family: var(--node-editor-theme-control-font-family);
  --node-editor-tab-button-font-size: 0.8125rem;
  --node-editor-tab-button-font-weight: 600;
  --node-editor-tab-button-line-height: 1.4;
  --node-editor-tab-button-letter-spacing: normal;
  --node-editor-tab-button-text-transform: none;
  --node-editor-tab-button-transition: none;
  --node-editor-tab-button-first-border-radius: 6px;
  --node-editor-tab-button-last-border-radius: 6px;

  /* Tab Button Active State - Meta style */
  --node-editor-tab-button-active-background: #ffffff;
  --node-editor-tab-button-active-color: #0866ff;
  --node-editor-tab-button-active-font-weight: 600;
  --node-editor-tab-button-active-border: none;
  --node-editor-tab-button-active-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
  --node-editor-tab-button-active-hover-opacity: 1;

  /* Tab Button Hover State */
  --node-editor-tab-button-hover-background: rgba(0, 0, 0, 0.04);
  --node-editor-tab-button-hover-color: #050505;

  /* Tab Button Focus State */
  --node-editor-tab-button-focus-outline: 2px solid #0866ff;
  --node-editor-tab-button-focus-outline-offset: -2px;

  /* Tab Button Disabled State */
  --node-editor-tab-button-disabled-opacity: 0.4;

  /* Connection styling - clean Meta style, no transitions */
  --node-editor-connection-base-stroke-width: 2;
  --node-editor-connection-active-stroke-width: 3;
  --node-editor-connection-flow-stripe-stroke-width: 2;
  --node-editor-connection-flow-stripe-active-stroke-width: 3;
  --node-editor-connection-direction-stroke-width: 2;
  --node-editor-connection-hover-shadow: drop-shadow(0 2px 4px rgba(8, 102, 255, 0.2));
  --node-editor-connection-selected-shadow: drop-shadow(0 2px 6px rgba(8, 102, 255, 0.3));
  --node-editor-connection-hover-opacity: 1;
  --node-editor-connection-dragging-opacity: 0.6;
  --node-editor-connection-stripe-dash-array: 0;
  --node-editor-connection-stripe-dash-offset-bg: 0;
  --node-editor-connection-stripe-opacity-accent: 1;
  --node-editor-connection-stripe-opacity-background: 0.3;
  --node-editor-connection-flow-animation-duration: 0s;
  --node-editor-connection-flow-animation-distance: 0;
  --node-editor-connection-base-transition: none;
  --node-editor-connection-arrow-transition: none;

  /* Connection drag styling */
  --node-editor-connection-drag-stroke-width-connecting: 2;
  --node-editor-connection-drag-stroke-width-disconnecting: 3;
  --node-editor-connection-drag-dash-array-connecting: 6 6;
  --node-editor-connection-drag-dash-array-disconnecting: 8 4;
  --node-editor-connection-drag-animation-duration: 0s;
  --node-editor-connection-drag-animation-distance: 0;
}