/* 4px base grid. The deck's own margins are derived from the template:
   side margin 515938 EMU ≈ 54px @1280, top bar 287472 EMU ≈ 30px. */
:root{
  --space-0:0; --space-1:4px; --space-2:8px; --space-3:12px; --space-4:16px;
  --space-5:20px; --space-6:24px; --space-7:32px; --space-8:40px; --space-9:48px;
  --space-10:56px; --space-11:64px; --space-12:80px; --space-14:104px; --space-16:128px;

  --gutter-page:54px;      /* deck / document side margin */
  --gutter-section:80px;
  --content-max:1140px;
  --measure:68ch;          /* comfortable Arabic reading measure */

  --control-h-sm:32px; --control-h-md:40px; --control-h-lg:48px;
  --tap-min:44px;
}