/* ============================================================================ shared/chrome.css · the sitewide navigation chrome: a.backlink, the pill in the top-left corner that goes back to the portfolio. Fixed, not fixed-until-you-scroll, so it persists over every section, dark panel or glass diagram included. No script dependency. Link it after shared/scroll.css, or near the end of on a page with no scroll.css: SPECIFICITY CONTRACT -------------------- The pill's identity, that it is fixed top-left, sized as a comfortable hit area, and set in the rail's own label typeface, is stated at normal specificity: several pages still carry an older in-flow .backlink rule (mono, inline, no background) in their own