:root{
  /* Product photography sits on white with one soft contact shadow.
     UI elevation follows: low, neutral, never coloured. */
  --shadow-0:none;
  --shadow-1:0 1px 2px rgba(20,20,20,.08);
  --shadow-2:0 2px 6px rgba(20,20,20,.10);
  --shadow-3:0 6px 18px rgba(20,20,20,.12);
  --shadow-4:0 18px 44px rgba(20,20,20,.16);
  --shadow-inset:inset 0 1px 0 rgba(255,255,255,.6);
  --shadow-focus:0 0 0 2px var(--white),0 0 0 4px var(--focus-ring);

  /* Signature surfaces */
  --gradient-header:linear-gradient(180deg,var(--red-500) 0%,var(--red-600) 100%);
  --gradient-splash:linear-gradient(160deg,var(--red-400) 0%,var(--red-500) 100%);
  --gradient-steel:linear-gradient(180deg,var(--steel-100) 0%,var(--steel-300) 48%,var(--steel-500) 100%);
  --overlay-scrim:linear-gradient(180deg,rgba(0,0,0,0) 0%,rgba(0,0,0,.55) 100%); /* @kind color */
}