/* The palette is CLOSED. Four values. Never extend it — redesign the piece instead. */
:root{
  --ink:#0F0F0E;        /* warm near-black; not pure black, not blue */
  --parchment:#F4EFE6;  /* warm paper ground */
  --brass:#8A6D3B;      /* matte, unpolished; structural accent only */
  --umber:#6B6558;      /* secondary text, utility labels */

  /* Working derivations of the four. Not new colours. */
  --ink-2:#25231F;          /* body prose on parchment */
  --parchment-2:#ECE5D3;    /* recessed panel / plate ground */
  --brass-hi:#A78448;       /* brass on ink ground only (contrast lift) */
  --rule:#D6CDBA;           /* hairline on parchment */
  --rule-ink:rgba(199,169,118,.24); /* hairline on ink ground */

  /* Semantic aliases */
  --surface-page:var(--parchment);
  --surface-plate:var(--parchment-2);
  --surface-inverse:var(--ink);
  --text-primary:var(--ink);
  --text-body:var(--ink-2);
  --text-secondary:var(--umber);
  --text-accent:var(--brass);
  --text-on-inverse:var(--parchment);
  --text-accent-on-inverse:var(--brass-hi);
  --border-hairline:var(--rule);
  --border-structural:var(--ink);
  --accent-rule:var(--brass);
}