Festival island header with a glider and colour dots

One file, zero dependencies, “use client” for the scroll state, the glider, the scroll spy and the menu. A sticky <header> with pointer-events:none, only the islands are clickable. The dock gets data-scrolled after 8px: the bar collapses its gap and max-width and gains dense glass with a shadow, while the islands drop their background, border and shadow — three pills become one. The glider is a span with width and translate3d from CSS variables written from offsetLeft/offsetWidth: a link's onMouseEnter leads it under the cursor, onMouseLeave returns it under aria-current; a ResizeObserver recomputes on reflow. The current section comes from an IntersectionObserver on the link anchors (rootMargin -40 %/-55 %). The link dot maps link.color to --dot, scaled 1.5 when active. Links from 60rem (container query); below that a burger with aria-expanded, a data-open panel under the header, Escape and an outside click close it. Under 32rem the burger hides its label. Palette --vibeui-navbar-023-* is neutral: ink and paper via light-dark(), the site colours come through the accent, ink and background props; pill colours live in the data (color and ink per item), so one section can carry all twelve festival colours. Inter Tight and Inter via <link precedence> from Google Fonts with system fallbacks. tone pins the scheme, accent, ink and background override colours.