Build the landing page for a fictional Bookmark Manager and follow these guidelines:
- Use TailwindCSS framework to style the landing page
- Incorporate modern CSS layouts such as Flexbox and Grid
- Use semantic HTML elements such as header, nav, footer and ensure that the page is accessible by performing an accessibility audit
- Utilize JavaScript for the tab bars and subscribe form
- Match the design as closely as possible
- Ensure that the page is responsive and looks good on all screen sizes