Create a single-page SPA (Single Page Application) using HTML, CSS, and JavaScript. The application should be a visually engaging educational platform focused on the Super-Kamiokande neutrino observatory, inspired by a 'Physics Girl' style presentation.
**Core Features:**
1. **Hero Section:** A prominent, engaging header with the application title and a brief, captivating tagline about understanding the universe through neutrinos.
2. **Video Integration:** Embed a YouTube video (use a placeholder or a relevant public domain video URL initially) explaining the Super-Kamiokande experiment and neutrino detection. The video player should be responsive.
3. **Interactive Content Blocks:** Below the video, create distinct sections for:
* **What are Neutrinos?**: Simple, digestible explanation with analogies. Include a small interactive element, like a clickable diagram.
* **Super-Kamiokande Explained**: Describe the detector's scale, location (underground!), and how it works to detect Cherenkov radiation from neutrinos. Use clear infographics or simple illustrations (can be text-based descriptions initially).
* **The Importance**: Briefly touch upon what neutrino research tells us about the universe (e.g., particle physics, astrophysics).
4. **Mini-Quiz:** A short, 3-5 question multiple-choice quiz to test understanding of the content presented. Provide immediate feedback (correct/incorrect).
5. **Further Exploration:** Links to relevant external resources (e.g., official Super-Kamiokande site, Physics Girl's channel, NASA articles) for users who want to learn more.
6. **Responsive Design:** Ensure the layout adapts gracefully to different screen sizes (desktop, tablet, mobile).
**Styling (CSS):**
* Use a clean, modern, and slightly playful aesthetic, reminiscent of engaging science communication. Think vibrant colors used sparingly, clear typography, and good use of whitespace.
* Focus on readability and user experience.
* Ensure smooth transitions for interactive elements.
**Functionality (JavaScript):**
* Handle video player controls (play/pause - basic functionality is sufficient).
* Implement the logic for the mini-quiz (display questions, track answers, show results).
* Handle any interactive elements within the content blocks.
* Ensure the SPA navigation (if any is implemented via JS) is seamless, though for a single page, this might just mean smooth scrolling.
**Initial Structure:**
* Use semantic HTML5 tags.
* Organize CSS into a separate file or within `<style>` tags.
* Place JavaScript in a separate file or within `<script>` tags.
**Goal:** Create a functional, visually appealing, and educational single-page application that makes learning about neutrinos and the Super-Kamiokande experiment accessible and fun.