:root {
  /* Colors — dark theme */
  --color-bg: #0f1117;
  --color-bg-alt: #161822;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-primary: #60a5fa;
  --color-primary-dark: #3b82f6;
  --color-primary-light: hsl(214deg 100% 68% / 15%);
  --color-accent: #34d399;
  --color-accent-dark: #10b981;
  --color-danger: #f87171;
  --color-danger-bg: hsl(14deg 85% 63% / 10%);
  --color-warning-bg: hsl(42deg 91% 53% / 10%);
  --color-warning-text: #fbbf24;
  --color-border: #1e293b;
  --color-header-bg: hsl(218deg 23% 9% / 95%);
  --color-card-bg: #161822;
  --color-card-hover: #1e2030;
  --color-footer-bg: #0a0c12;
  --color-footer-text: #64748b;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Layout */
  --max-width: 72rem;
  --header-height: 4rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px hsl(0deg 0% 0% / 30%);
  --shadow-md: 0 4px 6px -1px hsl(0deg 0% 0% / 40%), 0 2px 4px -2px hsl(0deg 0% 0% / 30%);
  --shadow-lg: 0 10px 15px -3px hsl(0deg 0% 0% / 40%), 0 4px 6px -4px hsl(0deg 0% 0% / 30%);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}