Build a callback request card with Tailwind CSS: a phone number input with country-code select that formats as you type, a timezone select defaulting to the visitor's detected zone, preferred-window radio chips (Morning / Afternoon / Evening local time), an optional topic field, and a submit button that confirms with the chosen window converted to the support team's timezone. Validate the phone number length per selected country and show a plain-text summary of when to expect the call.
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。