Helios 3D Product

# Helios — 3D Product Landing Page

## Goal
Build a production-ready 3d product landing page called "Helios". Overall vibe: an object worth staring at — Apple-grade restraint around a single hero model. It should look hand-crafted by a senior product designer — not like a generic template.

## Design System
- **Palette**: graphite #0E0E11 stage, #F2F2F4 type, one warm amber #FFB020 used only for the accent light and CTA
- **Typography**: Inter or Geist; display 64-96px at -0.035em, body 17px at 1.6, spec tables in tabular numerals
- **Grid & spacing**: 12-col grid, 8px base unit. Desktop secti