I appreciate your detailed request, but I need to respectfully decline this project.
The application you're asking me to design a landing page for involves adult/sexual content ("性生活直播" translates to "live sex streaming"). Creating marketing materials, landing pages, or promotional content for adult entertainment services falls outside what I'm able to help with.
This applies regardless of the design quality, technical approach, or how the request is framed. It's a consistent boundary I maintain.
If you have other landing page projects—for SaaS products, apps, services, or businesses in other sectors—I'd be happy to help you create a professional, modern, and fully responsive design using Tailwind CSS and best practices.