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Tuck Banner

An announcement strip that is put away, not thrown away: dismissing it folds the message into a thin rail along the top with a tab that names it, and the tab brings it back. The choice is remembered per announcement.

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Written for the variant you picked above: Paper

Build an announcement banner for the top of a page that treats dismissal as a reversible choice. Open state: a full-width strip on a slightly tinted ground with a 1px bottom rule, at least 48px tall. Inside: a mono caps tag in the accent colour naming the announcement ("Relay 4.2"), one sentence of text, a medium-weight underlined action link, and a "Tuck away" button with a small chevron (mono caps, muted, 44px tall). On narrow containers (under 34rem, container query) the button moves to its own line at the right. Tucking: the strip folds closed while a 28px rail folds open below it, as two grids sharing the space (grid-template-rows 1fr to 0fr and 0fr to 1fr, 320ms cubic-bezier(.2,.8,.2,1)). The rail holds one tab at the right edge: an accent dot, the same label and a chevron pointing up, which reopens the strip. Whichever fold is closed is visibility: hidden, switched after the animation, so it is out of the tab order. Focus moves to the tab after tucking and to the action link after reopening, so keyboard focus is never lost. Memory: pass a storageKey and the tucked state is saved in localStorage (inside try/catch) and read after mount, never during the first render, so server and client agree; nothing animates until it has been read, and the banner is hidden until then to avoid a flash. Changing the key announces something new and opens the banner again. Without a key, nothing is stored. The root is an aside labelled "Announcement"; the tab has aria-expanded and aria-controls. Paper and Night themes. Selected variant — Paper (paper): Palette for this theme (Paper): --tb-accent #2f6bff; --tb-bg #ece9df; --tb-ink #1b1a17; --tb-line rgb(27 26 23 / 0.12); --tb-muted #6b6861. Treat these as the root colour tokens, one value per role, and name them to suit your code. Select it with the theme option set to "paper". Keep every dimension, spacing value, state and motion from the brief unchanged, and keep text at 4.5:1 contrast or better on these surfaces. 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: Press Tuck away and the message folds into the rail; press the tab to read it again. Motion: Both folds move over 320ms; chevrons nudge 2px on hover over 240ms. Accessibility: A labelled aside; the tab reports aria-expanded and controls the strip; the folded-away side is hidden from assistive tech and the tab order; focus moves to the control that has just appeared. Reduced motion makes the fold instant. Responsive behavior: Container query at 34rem wraps the strip and pushes the Tuck away button to the right; the rail is always one line. Touch: Both controls are real buttons with 44px or larger hit areas; no hover is required. 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
Press Tuck away and the message folds into the rail; press the tab to read it again.
Motion
Both folds move over 320ms; chevrons nudge 2px on hover over 240ms.
Accessibility
A labelled aside; the tab reports aria-expanded and controls the strip; the folded-away side is hidden from assistive tech and the tab order; focus moves to the control that has just appeared. Reduced motion makes the fold instant.
Responsive
Container query at 34rem wraps the strip and pushes the Tuck away button to the right; the rail is always one line.
On touch
Both controls are real buttons with 44px or larger hit areas; no hover is required.

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