/* =============================================================================
   Design tokens — all variables for the entire site
   ============================================================================= */
:root {
  /* Colors */
  --bg:           #FAFAFA;
  --surface:      #FFFFFF;
  --surface-alt:  #F3F4F6;
  --text:         #1A1A1A;
  --text-muted:   #6B7280;
  --text-light:   #9CA3AF;
  --accent:       #4F6AF0;
  --accent-hover: #3B55D9;
  --accent-light: #EEF2FF;
  --border:       #E5E7EB;
  --border-dark:  #D1D5DB;
  --danger:       #EF4444;
  --success:      #10B981;
  --warning:      #F59E0B;

  /* Typography */
  --font-body:  system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono:  ui-monospace, 'Cascadia Code', '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;
  --leading:    1.7;
  --leading-tight: 1.3;

  /* 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;

  /* Layout */
  --max-w:      720px;
  --max-w-wide: 1080px;
  --nav-h:      56px;
  --radius-sm:  3px;
  --radius:     6px;
  --radius-lg:  10px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow:    0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);

  /* Transitions */
  --transition: 150ms ease;
}