body.nav-fixed pads 88px but hero only pulled up by --nav-height (60px),
leaving a blank strip above the slider. Share --nav-fixed-reserve so body
padding and hero margin-top cancel exactly, matching zibll slide-header.
Remove CSS that forced relative header and cancelled hero underlap,
disable sticky inside absolute show-slide nav, hide desktop expanded
search form for layout-1, and size logos at 36px height like zibll.
Make show-slide header overlay the hero, dual-class nav/footer shells
toward zibll selectors, and add a small footer layout bridge for logo,
contact, and float buttons.
kate522