/* Part colours ---------------------------------------------------------
   A long course is divided into parts, and each part owns one spectrum hue.
   That hue appears in the chapter's nav entry, its header rule, its section
   markers and its numbered badges — so a reader knows where they are before
   reading a word.

   Four parts is the tested maximum; beyond that the hues stop being
   distinguishable at nav-entry size. */
:root {
  --part-1: var(--c-cyan);      /* Preliminaries — rooflines, hardware */
  --part-2: var(--c-violet);    /* Core theory */
  --part-3: var(--c-magenta);   /* Practice */
  --part-4: var(--c-gold);      /* Appendices, bonus material */

  /* Text-safe counterparts. Use these for any word tinted to its part. */
  --part-1-ink: var(--ink-cyan);
  --part-2-ink: var(--ink-violet);
  --part-3-ink: var(--ink-magenta);
  --part-4-ink: var(--ink-gold);

  /* Semantic pair for a lesson's verdict blocks. */
  --verdict-good: var(--c-green);
  --verdict-bad:  var(--c-magenta);
}