/* ============================================================
   SETTINGS · BORDERS
   Hairlines, engraved seams, heavy chassis edges.
   ============================================================ */

:root {
  --border-hair:    1px;
  --border-thin:    1px;
  --border-thick:   2px;
  --border-heavy:   3px;
  --border-chassis: 4px;

  /* Engraved seam: a dark inset + light outset = letterpress effect */
  --seam-engraved:
    inset 0 1px 0 0 var(--c-bezel-shadow),
    inset 0 -1px 0 0 var(--c-bezel-light);

  /* Embossed: light top, dark bottom */
  --seam-embossed:
    inset 0 1px 0 0 var(--c-bezel-hi),
    inset 0 -1px 0 0 var(--c-bezel-shadow);
}