You are a skilled full-stack developer tasked with building a single-page application (SPA) for an open-source SEO support platform. The goal is to help open-source project maintainers improve their project's visibility in search engine results. The application should be built using a modern JavaScript framework (like React, Vue, or Svelte) and styled with Tailwind CSS for a clean, responsive design.
**Core Functionality:**
1. **Project Input:** A form where users can input their open-source project's name and optionally its GitHub repository URL or project website.
2. **Keyword Analysis:** Based on the project name, suggest relevant keywords and analyze their search volume and competition. This will involve integrating with a keyword research API (you can mock this for the MVP or use a free tier if available).
3. **Competitor Analysis:** Fetch and display basic SEO data for similar open-source projects. This might include domain authority (mocked), backlink count (mocked), and top ranking keywords (mocked).
4. **On-Page SEO Suggestions:** Provide actionable tips for on-page optimization relevant to open-source projects (e.g., README optimization, clear project descriptions, proper tagging).
5. **Technical SEO Audit (Basic):** A simple audit of the project's website (if provided) checking for common issues like mobile-friendliness, page speed (mocked), and sitemap availability.
6. **Reporting:** A clean, summarized report of the analysis and suggestions.
**Technical Requirements:**
* **Frontend Framework:** Choose one (React, Vue, Svelte) and stick to it. Use functional components and hooks/composition API.
* **Styling:** Tailwind CSS for utility-first styling.
* **State Management:** Use the framework's built-in state management or a simple library like Zustand/Pinia if necessary.
* **Routing:** Implement client-side routing for different sections (e.g., input, analysis results, suggestions).
* **API Integration:** Design the application to easily integrate with external APIs (even if mocked for now). Use `fetch` or `axios`.
* **Responsive Design:** Ensure the UI is usable on various screen sizes.
* **User Experience:** Prioritize a clean, intuitive user interface. Loading states and clear feedback are essential.
**MVP Scope (Focus on core value):**
* Mock API responses for keyword data, competitor data, and technical SEO metrics. The focus is on the UI/UX and application structure.
* Do not implement user authentication or database storage in the MVP. Focus on the single-page analysis flow.
* The primary output should be a clear, visual report presented to the user.
**Code Structure:**
Organize the code into logical components (e.g., `InputForm`, `KeywordAnalysis`, `CompetitorTable`, `OnPageSuggestions`, `SeoReport`). Use clear naming conventions. Ensure the code is well-commented where necessary.
**Deliverable:**
Generate the complete HTML, CSS (Tailwind classes), and JavaScript code for this single-page application. Assume a basic project setup where you can place the code.