Build an FAQ with an expand-all control in Tailwind CSS: a header row with the question count and a toggle that expands or collapses every answer at once, with the button label flipping between 'Expand all' and 'Collapse all'. Individual questions still open and close independently afterwards, and the toggle reflects a mixed state when only some are open.
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。