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No.386 · Sections· New

Running Head

A section header set like a chapter opening, with a running head: when it scrolls away, a slim version of it stays pinned for as long as you are inside the section, then hands over to the next section's.

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Written for the variant you picked above: Paper

Build the heading block that opens every section of a long page, plus the small pinned version that tells you where you are after it has scrolled away, like the running head at the top of a book page. The block: a row with a mono index ("02", 11px, 0.14em capitals, tabular numerals), a 1px rule that fills the remaining width, and an optional right-aligned fact in the same mono style ("Four of twenty-one"). Below it the heading in a display serif, clamp(2rem, 7cqi, 3.5rem), line-height 1.02, tracking -0.02em, max 20ch, balanced; then an optional lede in muted sans at 15px, 46ch. The rule draws once, scaleX from the left over 700ms (cubic-bezier(.16,1,.3,1)), the first time the block enters view. Nothing else moves. The running head: render a zero-height position: sticky element as the first child of the section, at top: stickyTop. A 38px bar hangs from it: index in ink, the short label in the serif at 17px, the fact on the right, with a hairline under it. It is invisible until the full block has left the top of the scroller (IntersectionObserver with rootMargin -stickyTop, true only when the block's bottom edge is above the pin line), then fades in and settles from 6px above (240ms). Because a sticky element can't leave its parent, it goes away with the section and the next section's own running head takes over, with no JavaScript handover. The bar is aria-hidden (the real heading is still in the document); the heading is a real h1/h2/h3. The scroller is passed as scrollRef; stickyTop leaves room for a sticky navbar. Container query at 30rem hides the right-aligned fact. Paper and Night themes. Selected variant — Paper (paper): Apply the paper theme. Where the brief above gives no colour values for it, choose a restrained paper palette with text at 4.5:1 contrast or better. Keep the geometry, states and motion described above unchanged. This selection takes precedence over references to other themes or options in the general brief. Implement this selected appearance; do not add a variant picker or alternative appearances unless requested. Implementation requirements: Use React and TypeScript. Keep the component self-contained, with uniquely scoped CSS and no animation libraries. Include required imports, styles and font setup in the result. Interaction: Scroll through a section and its slim running head appears at the top; keep going and the next section's head replaces it. Motion: Rule draws once in 700ms; running head fades in and settles over 240ms. Accessibility: The block is a real heading; the pinned bar is aria-hidden because it only repeats it. Nothing depends on motion; reduced motion shows the rule drawn and the bar appears without travel. Responsive behavior: Type scales with the container width (cqi); the right-hand fact is dropped below 30rem and the bar truncates its label. Touch: Scroll-driven only, so touch behaves identically. Preserve keyboard access, visible focus and reduced-motion behavior. Keep fictional demo data and simulated service calls in a separate usage example; expose callbacks for real actions and recover from rejected requests. Keep usage-example links inside the demo: use local buttons or prevent navigation. Demonstration links must not navigate to Vitrine routes or open other pages; preserve real URL support in the reusable component itself. Verify the result at narrow and wide viewport sizes, with keyboard input and reduced motion enabled.

Notes

Interaction
Scroll through a section and its slim running head appears at the top; keep going and the next section's head replaces it.
Motion
Rule draws once in 700ms; running head fades in and settles over 240ms.
Accessibility
The block is a real heading; the pinned bar is aria-hidden because it only repeats it. Nothing depends on motion; reduced motion shows the rule drawn and the bar appears without travel.
Responsive
Type scales with the container width (cqi); the right-hand fact is dropped below 30rem and the bar truncates its label.
On touch
Scroll-driven only, so touch behaves identically.

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