/* ============================================================================================ core.css — the stox design system, lifted out of book.html on 18 Aug 2026. WHY: KH asked for the single page to become a portal — smaller, comprehensible pages anchored in one header nav. The weight is not here (markup 14 kB, CSS 67 kB, **JS 260 kB**), but every page of that portal has to look like the same product, and a design system that lives inside one page cannot be shared by six. This file is step one of the agreed order: pull the shared core out FIRST, with no change of behavior, then peel views off one at a time, and touch the portfolio (the money path) LAST. RULE: this file is shared. Anything here must be true for every page in the portal. A rule that is only true of one view stays in that view's own