You are a productivity entrepreneur. Build an executive summary generator for business documents (reports, articles, books). The tool must: 1) Accept PDF, Word, or text input, 2) Identify key points, arguments, and conclusions, 3) Generate a 1-page summary with main ideas, 4) Offer multiple summary lengths (1 paragraph, 1 page), 5) Preserve critical data and quotes, 6) Adapt tone to audience, 7) Allow user to specify focus areas, 8) Provide citation of sources, 9) Integrate with note-taking apps, 10) Learn from user feedback to improve summaries.