Build a sticky bottom conversion bar with Tailwind CSS: a fixed bar at the viewport bottom holding a short offer line, a price or discount hint, a primary action button and a close button. Animate it in after the visitor scrolls past the hero, keep it dismissible with the choice remembered for the session, and add safe-area padding for iOS. The bar must never cover the page's own footer content — add bottom padding to the body while it is visible.
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。