:root{
  --radius-none:0;
  --radius-sm:0.375rem;  /* 6  - inputs, chips */
  --radius-md:0.75rem;   /* 12 - buttons */
  --radius-lg:1.25rem;   /* 20 - cards */
  --radius-xl:2rem;      /* 32 - photo masks, feature panels */
  --radius-pill:999px;

  --border-hairline:1px;
  --border-standard:2px;   /* the brand's default rule weight */
  --border-heavy:3px;

  /* The brand does not use drop shadows for decoration.
     Elevation is expressed with borders and colour blocks.
     These two exist only for genuinely floating layers. */
  --shadow-overlay:0 8px 32px rgba(28,58,45,0.16);
  --shadow-sticky:0 2px 0 var(--pia-neutral-200);
}