Build an anchor navigation with scroll spy in Tailwind CSS: a vertical list of section links beside a long article, where the link matching the section currently in view is highlighted and a thin progress indicator shows reading position. Use an IntersectionObserver to track sections, smooth-scroll on click with scroll-margin to account for the sticky header, and collapse the list into a horizontal scrollable strip 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。