:root{
  /* Checker field: the brand's one repeating texture. Size via --checker-size. */
  --checker-size:16px;
  --checker-light:var(--square-light);
  --checker-dark:var(--square-dark);
  --pattern-checker:
    repeating-conic-gradient(var(--checker-dark) 0% 25%, var(--checker-light) 0% 50%)
    0 0 / calc(var(--checker-size)*2) calc(var(--checker-size)*2);
  /* Paper grain: 2% warm noise via layered gradients (no image asset). */
  --pattern-grain:
    radial-gradient(rgba(122,99,73,.045) 1px, transparent 1.2px) 0 0/7px 7px,
    radial-gradient(rgba(122,99,73,.035) 1px, transparent 1.2px) 3px 4px/11px 11px; /* @kind other */
}
.gambit-checker{background:var(--pattern-checker)}
.gambit-grain{background-image:var(--pattern-grain)}