Build a responsive landing page for a modern AI product or startup.

<blockquote><b>Prompt:</b><b></b></blockquote>
<blockquote>Build a responsive landing page for a modern AI product or startup.</blockquote>
<blockquote><b>Layout Requirements:</b><b></b></blockquote>
<ul>
<li>
<blockquote>Full-screen hero section with a headline, short description, and clear call-to-action button (e.g., “Try for Free” or “Join Beta”).</blockquote>
</li>
<li>
<blockquote>Three feature cards highlighting core benefits or features.</blockquote>
</li>
<li>
<blockquote>Testimonial or “Trusted by” section for social proof.</blockquote>
</li>
<li>
<blockquote>Simple email signup form connected to a mock mailing list.</blockquote>
</li>
<li>
<blockquote>Footer with navigation, contact info, and company logo placeholder.</blockquote>
</li>
</ul>
<blockquote><b>Design Style:</b><b></b></blockquote>
<ul>
<li>
<blockquote>Clean, commercial, and tech-oriented.</blockquote>
</li>
<li>
<blockquote>Neutral color palette (white, light gray, soft blue or charcoal).</blockquote>
</li>
<li>
<blockquote>Rounded corners, soft shadows, and light fade-up animations on scroll.</blockquote>
</li>
<li>
<blockquote>Use open-source fonts like Inter, Poppins, or Work Sans.</blockquote>
</li>
</ul>
<blockquote><b>Tech Stack:</b><b></b></blockquote>
<blockquote>HTML + CSS (Tailwind or vanilla) + minimal JS for smooth scroll and form interactivity.</blockquote>
<blockquote>Output fully structured code in one file, ready to deploy or copy into Framer, Replit, or Vercel.</blockquote>