RidgeAI — Référence de design web et prompt

# Prompt: RidgeAI hero

Build a single-file, full-viewport **AI app-builder landing hero** for a fictional company, **RidgeAI** ("ship real apps from a plain idea"). Use plain HTML, CSS and vanilla JS, with no framework and no build step.

## Look and feel

- **Background:** a full-bleed cinematic photograph of snowy alpine peaks at sunrise, with a low sun on the right, a calm blue sky across the upper half, and glowing amber circuit-like light paths tracing the dark forested valleys and converging at the bottom centre.
  - Over it sits a slow looping video of the same scene, where the light pulses through the paths and clouds drift.
  - On top of that are two screen-blended CSS layers: an amber bloom over the valleys that swells and fades (4.6s, alternate), and a soft light band that sweeps across them (6.5s).
  - A faint dark radial shade sits behind the centre copy so white text stays readable over the bright peaks.
- **Type:** **Inter** (variable, self-hosted).
  - headline 400 weight, white