Aurora Onboard

Please build a modern, two-column registration interface called "Aurora Sign Up". Use React, Tailwind CSS (v4), `motion/react` (for animations), and `lucide-react` (for icons). The app should be contained entirely in `App.tsx` and `index.css`.

### 1. Global Setup & CSS (`index.css`)
- Import the "Inter" font from Google Fonts (weights 300, 400, 500, 600, 700).
- Extend the Tailwind theme with `--font-sans: "Inter", ui-sans-serif, system-ui, sans-serif;` and a custom color: `--color-brand-gray: #1A1A1A`.
- Apply base styles to the `body`: `@apply font-sans bg-black text-white antialiased;`.

### 2. Main Layout (`App.tsx` container)
- The `<main>` element should have: `flex min-h-screen w-full bg-black selection:bg-white/30 p-2 transition-all duration-500`. 
- On `lg` breakpoints: `lg:h-screen lg:overflow-hidden lg:p-4`.
- Split this container into a Left Column (Hero) and a Right Column (Form).