Build an AI SEO blog post generator with the following numbered features:
1. A keyword input where the user pastes a target query and the tool pulls the top 10 ranking pages, extracts their headings, and maps the content gaps to cover.
2. An outline builder that proposes H2 and H3 structures, a TL;DR block, and an FAQ section based on People Also Ask style questions.
3. A brand voice profile where users paste 3 sample posts so every draft matches their tone before generation starts.
4. Section-by-section drafting so the user can accept, regenerate, or edit each H2 individually instead of a monolithic wall of text.
5. Internal linking suggestions from the site's own sitemap so new posts hook into existing topical clusters.
6. An on-page checklist that scores title length, meta description, keyword placement, heading hierarchy, and readability, and blocks publishing until issues are fixed.
7. A citation pass requiring the AI to attach a source URL to every factual claim, with unsourced sentences highlighted for manual review.
8. A duplicate-risk meter estimating similarity against the sources scraped in step 1 so the draft never parrotts a competitor.