:root {
  /* Colors */
  --bg-base:        #0a0a0f;
  --bg-surface:     #111118;
  --bg-card:        #1a1a2e;
  --bg-card-hover:  #20203a;

  --primary:        #00d4ff;
  --primary-dark:   #009bbf;
  --primary-glow:   rgba(0, 212, 255, 0.15);

  --secondary:      #6c63ff;
  --secondary-dark: #4f48cc;
  --secondary-glow: rgba(108, 99, 255, 0.15);

  --accent:         #ff6b35;
  --accent-dark:    #cc4f1f;

  --success:        #10b981;
  --warning:        #f59e0b;
  --danger:         #ef4444;

  --text-primary:   #e2e8f0;
  --text-secondary: #8892a4;
  --text-muted:     #4a5568;

  --border:         #2a2a3e;
  --border-hover:   #3d3d5c;

  /* Typography */
  --font-sans:  'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', 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;

  --weight-normal:   400;
  --weight-medium:   500;
  --weight-semibold: 600;
  --weight-bold:     700;

  --leading-tight:  1.25;
  --leading-normal: 1.6;
  --leading-loose:  1.8;

  /* 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-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Layout */
  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1280px;
  --container-2xl: 1440px;

  /* Borders */
  --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(0,0,0,0.4);
  --shadow-md:      0 4px 16px rgba(0,0,0,0.5);
  --shadow-lg:      0 8px 32px rgba(0,0,0,0.6);
  --shadow-primary: 0 0 24px var(--primary-glow);
  --shadow-card:    0 2px 20px rgba(0,0,0,0.4);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* Z-index */
  --z-base:    1;
  --z-dropdown: 100;
  --z-sticky:  200;
  --z-overlay: 300;
  --z-modal:   400;
  --z-toast:   500;

  /* Nav */
  --nav-height: 90px;
}