The prompt

Build a dark launch countdown banner with Tailwind CSS, full width with a rounded-3xl inner card. Centre a small "Early access closes soon" pill, a two-line headline, and a countdown row of four tiles — days, hours, minutes, seconds — each a translucent rounded box with a large monospaced number above a tiny uppercase label. Under the timer, an inline email form (single field plus a white submit button) that stays side by side from sm up, then a muted line about seats remaining. Give each number tile an id and wrap the whole timer in a container that can be replaced when it reaches zero. Then add JavaScript that counts down to a launch timestamp every second: pad each unit to two digits, stop the interval at zero and swap the timer for a "We are live" message with a changed button label, and keep the seat line honest by decrementing it on a slow interval.

Paste it into Claude, Cursor, v0 or any AI coding tool. Prefer the finished markup? Open the Tailwind source.