:root {
  /* Backgrounds */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;

  /* Glass */
  --glass-bg: rgba(30, 41, 59, 0.6);
  --glass-bg-darker: rgba(15, 23, 42, 0.8);
  --glass-border: rgba(71, 85, 105, 0.3);
  --glass-border-light: rgba(148, 163, 184, 0.15);
  --glass-blur: 12px;

  /* Accent */
  --accent: #0ea5e9;
  --accent-light: #38bdf8;
  --accent-dark: #0284c7;
  --accent-gradient: linear-gradient(135deg, #38bdf8, #2563eb);
  --accent-gradient-hover: linear-gradient(135deg, #7dd3fc, #3b82f6);

  /* Text */
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #38bdf8;

  /* Status */
  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.1);
  --error: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --warning: #f59e0b;

  /* Glow */
  --glow-accent: 0 0 40px rgba(14, 165, 233, 0.25);
  --glow-accent-strong: 0 0 60px rgba(14, 165, 233, 0.35);
  --glow-success: 0 0 40px rgba(34, 197, 94, 0.2);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: 8rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia 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;

  --leading-tight: 1.15;
  --leading-snug: 1.3;
  --leading-normal: 1.6;

  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

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

  /* Z-index */
  --z-nav: 100;
  --z-mobile-menu: 90;
  --z-modal: 200;
  --z-toast: 300;

  /* Container */
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Nav */
  --nav-height: 4rem;
}

@media (min-width: 768px) {
  :root {
    --container-padding: 2rem;
    --nav-height: 4.5rem;
  }
}

@media (min-width: 1024px) {
  :root {
    --container-padding: 2.5rem;
  }
}