Interactive Discovery

Build a full-screen, dark-themed hero section for a geology brand called **Lithos**, using **React 18 + TypeScript + Vite + Tailwind CSS** and **lucide-react** for icons. The signature feature is a **cursor-following spotlight that reveals a second image** through a soft circular mask on top of a base image. Match every detail below exactly.

### Fonts
Add this to the top of `src/index.css`, then `@tailwind base/components/utilities`:
```css
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@1,400;1,500;1,600&display=swap');
* { font-family: 'Inter', sans-serif; }
.font-playfair { font-family: 'Playfair Display', serif; }
```
- Body/UI font: **Inter**.
- Display/wordmark accent: **Playfair Display, italic**.