Build a waitlist landing page that captures emails

Build a single waitlist landing page for [PRODUCT NAME], which is [ONE SENTENCE ON WHAT IT DOES] for [WHO IT IS FOR].

The page:
- A strong headline stating the outcome, a one-line subheadline, and one email capture form above the fold.
- 3 short benefit points (what they get), and a simple visual or product mockup placeholder.
- One clear call to action: join the waitlist. No other competing links.
- A small line of social proof, for example a live count of people already on the list.

The form:
1. Collect the email, validate it, and store it in [Supabase table / Airtable / a simple database]. Prevent duplicate signups.
2. On success, swap the form for a thank-you message and, if easy, show their position in line.
3. [Optional] Send a confirmation email via [Resend / your email tool].
4. Handle errors gracefully with a visible message, and disable the button while submitting.

Style: clean, modern, fast, mobile-first. Use [my brand colors if I give them, otherwise a neutral palette with one accent color]. Make it look like a real product, not a template. Show me the page, then wire up the storage.