b67ada9c65
The shared-masthead change stripped the mirror page's local :root including four tokens the shell does not define (card, void-2, good, bad), leaving card backgrounds and status colours undefined on the live page. The index wrap was also narrowed to 64ch, squeezing the chapter cards; the masthead carries its own width limit so wrap returns to 56rem. Two American spellings in mirror prose corrected to artefact.