/* ============================================================
   Xier — Spacing, layout & sizing tokens
   8px base rhythm. 16-column grid, 24px gutter, fixed 64px brand
   rail on the left — carried over from the source layout system.
   ============================================================ */
:root {
  --space-0:  0;
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;
  --space-8:  64px;
  --space-9:  96px;
  --space-10: 128px;
  --space-11: 160px;
  --space-12: 200px;

  /* Layout */
  --rail-width: 64px;       /* fixed brand sidebar */
  --page-pad: 16px;         /* page gutter */
  --grid-columns: 16; /* @kind other */
  --grid-gutter: 24px;
  --container-max: 1680px;

  /* Section rhythm (vertical) */
  --section-pad-y: 96px;
  --section-pad-y-lg: 160px;

  /* Control sizing */
  --control-h-sm: 32px;
  --control-h:    44px;   /* default — meets touch target */
  --control-h-lg: 56px;
}