:root{
  --space-0:0px;
  --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-10:64px;
  --space-11:80px;
  --space-12:104px;

  /* Semantic */
  --gutter-mobile:20px;         /* page side padding, phone */
  --gutter-desktop:40px;
  --page-max:1200px;
  --content-max:660px;          /* prose measure */
  --section-y-mobile:48px;      /* vertical rhythm between sections */
  --section-y-desktop:80px;
  --stack-tight:8px;
  --stack:16px;
  --stack-loose:24px;
  --card-padding:20px;
  --card-padding-lg:24px;
  --field-gap:16px;

  /* Touch */
  --tap-min:48px;
  --control-h-lg:56px;          /* primary emergency action */
  --control-h:48px;             /* default */
  --control-h-sm:40px;          /* desktop, non-critical only */
}