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No.194 · FAQ

Index FAQ

An accordion set like a book index: numbered entries, serif questions, a plus that becomes a dash and a rule that draws under the open one.

The prompt

The design brief behind this component — reuse it to regenerate, remix, or explain it.

Design an FAQ as the index of a book. A hairline-ruled ordered list; each entry is a full-width button in a three-column grid: a mono index number (01, 02…), a serif question (clamp 1.2–1.6rem, balanced wrapping), and a plus icon built from two 1.5px bars. Hovering nudges the question 4px right. Opening an entry (one at a time): the vertical bar of the plus rotates to horizontal over 400ms so the plus becomes a dash, and both the plus and the index turn frost blue; the answer opens with a grid-template-rows 0fr → 1fr transition (450ms, cubic-bezier(0.16,1,0.3,1)) so its height animates without measurement, while the answer text fades in and settles down from −6px after a 120ms delay; and a frost rule draws left to right along the bottom of the entry (650ms). Use real headings containing buttons with aria-expanded and aria-controls, answers as labelled regions, and arrow-key/Home/End navigation between questions.

Notes

Interaction
Click/Enter/Space toggles an entry; ↑/↓/Home/End move between questions.
Motion
Height 450ms via grid rows; icon 400ms; rule draw 650ms; text settle 450ms after 120ms.
Accessibility
Disclosure pattern: <h3><button aria-expanded aria-controls>, regions labelled by their questions, keyboard navigation between headers. Reduced motion shortens transitions.
Responsive
Fluid width; question size scales with container; answer indent collapses gracefully.

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