:root {
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 30px;
  --space-8: 38px;
  --space-9: 50px;
  --space-10: 64px;

  --content-max: 1280px;                              /* page max-width */
  --content-pad: clamp(20px, 5vw, 64px);               /* left/right page gutter */
  --section-pad-lg: clamp(88px, 12vw, 180px);          /* between major sections */
  --section-pad-md: clamp(80px, 10vw, 150px);
  --rail-width: 180px;                                 /* sticky numbered-label rail */
  --rail-top: 118px;                                   /* sticky offset under fixed nav */

  --radius-none: 0;
  --radius-round: 50%;   /* the only radius used: circular photos */
  --radius-chip: 2px;    /* rare — a couple of small icon rects only */
}