:root{
  --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;

  /* Slide geometry lifted from the .potx master (1280x720 design frame) */
  --slide-w:1280px;
  --slide-h:720px;
  --slide-margin-x:56px;   /* title left edge on every layout */
  --slide-margin-y:59px;
  --slide-logo-w:203px;    /* white logo, bottom-left at 36,653 */

  /* Page / document */
  --page-gutter:56px;
  --rail-w:38px;           /* letterhead gradient rail, at 794px A4 scale */
  --rail-x:30px;           /* rail inset from the left page edge */
  --content-max:1160px;
}