Laocoön — Bronze and Time — Référence de design web et prompt

# Recreate this site as a single HTML file: Laocoön — Bronze and Time

You are an expert creative front-end developer. Produce a **single self-contained `index.html`**
that reproduces the project below **exactly** — same layout, sections, visuals, motion, and
interaction. Pure HTML/CSS/JS in one file: no build step, no framework, no bundler. Use ES modules
with a CDN importmap for Three.js (r0.160 from unpkg, with the matching `GLTFLoader` addon).
Hardcode every value given here as a fixed constant. Rebuild each component described below as a
section of the one file.

## What it is

A cinematic, scroll-driven landing page titled **"Bronze and Time"** centered on a glowing,