Build an FAQ with a category rail in Tailwind CSS: a sticky left rail listing the topics with item counts, and a right column where answers are grouped under topic headings with generous spacing between groups. Highlight the rail item matching the group currently in view with an IntersectionObserver, smooth-scroll on click, and collapse the rail into a horizontal chip row on mobile.
提示词保持英文原文——直接粘贴进 Claude、Cursor、v0 或任何 AI 编程工具即可使用。