:root {
  --font-sans: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-xl: 8px;
  --radius-pill: 999px;

  /* Central industrial geometry: controls 4px, surfaces 6px, dialogs 8px. */
  --radius-control: 4px;
  --radius-surface: 6px;
  --radius-modal: 8px;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  --control-height-sm: 2rem;
  --control-height-md: 2.5rem;
  --control-height-lg: 3rem;

  --duration-fast: 140ms;
  --duration-normal: 220ms;
  --ease-standard: cubic-bezier(0.2, 0, 0, 1);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.10);
  --shadow-overlay: 0 8px 24px rgba(0, 0, 0, 0.20);

  /* One modal layer for all migrated management/operational surfaces. */
  --z-modal: 2000;
  --z-toast: 2100;
}