Build a countdown launch banner with Tailwind CSS: a headline announcing the launch date, a row of four monospace countdown cells (days, hours, minutes, seconds) ticking once per second, and an early-access email form underneath. When the countdown reaches zero, swap the timer for a 'We are live' state with a single enter button. Keep the digits in a tabular font so the row never jitters.
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。