:root {
  /* Colors */
  --primary: #2563eb;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --secondary: #7c3aed;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #06b6d4;

  /* Background */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-overlay: rgba(0, 0, 0, 0.5);

  /* Text */
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-light: #d1d5db;

  /* Borders */
  --border-light: #e5e7eb;
  --border-medium: #d1d5db;
  --border-dark: #9ca3af;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;

  /* Transitions */
  --duration-fast: 150ms;
  --duration-base: 200ms;
  --duration-slow: 300ms;
  --easing: cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1f2937;
    --bg-secondary: #111827;
    --bg-tertiary: #0f172a;
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
  }
}