Blazity/next-saas-starter ? reverse-engineered prompt

Build me a polished marketing website template for a SaaS startup that feels fast, modern, and easy to customize.

I want a responsive landing page with a strong hero section, feature sections, testimonials or social proof, pricing or call to action areas, and a clean footer. It should be SEO friendly, work well on mobile, and have a nice dark mode option. Include a simple blog area with MDX style posts and a way to edit content through a lightweight CMS experience if possible. Also add newsletter signup and contact form support, with placeholders for email and mailing service setup.

Please make it look production ready, with clean styling, smooth visuals, and great performance out of the box. Keep the code organized and simple to reuse for another SaaS project later. If you need to check any current setup details, look up the latest docs online first.