:root {
  /* Colors */
  --color-primary:       #2563EB;
  --color-primary-dark:  #1D4ED8;
  --color-primary-light: #EFF6FF;
  --color-accent:        #F59E0B;
  --color-accent-dark:   #D97706;
  --color-surface:       #FFFFFF;
  --color-surface-alt:   #F8FAFC;
  --color-border:        #E2E8F0;
  --color-text-base:     #0F172A;
  --color-text-muted:    #64748B;
  --color-text-light:    #94A3B8;
  --color-footer-bg:     #0F172A;
  --color-footer-text:   #CBD5E1;
  --color-topbar-bg:     #1E40AF;
  --color-success:       #10B981;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', '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;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-7:  1.75rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Border Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-xl:   16px;
  --radius-2xl:  24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg:   0 10px 30px rgba(0,0,0,0.12);
  --shadow-card: 0 2px 8px rgba(15,23,42,0.06), 0 0 0 1px rgba(15,23,42,0.04);

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