- brand: three-colour Hoelee mark (rasterised from the brand vector,
transparent, public/images/hoelee-mark-96.png) followed by the name
- section links grouped in .nav-links so the mobile header puts them on
their own row instead of wrapping past the search/lang/theme controls
- measured 320/360/390/414/600/768/1280: scrollWidth == innerWidth,
header 91.6px two rows (<600px) / 60.3px one row, mark loads at 22/26px
