Cutora — Référence de design web et prompt

# Prompt: Cutora log-in hero

Build a single-file, one-screen **log-in page** for a fictional video editor, **Cutora**. Use plain HTML, CSS and vanilla JS, with no framework and no build step. The look is warm and cinematic: a full-bleed upward view between golden glass skyscrapers at sunset fills the page. A big white headline sits over the photo on the left, and a clean white log-in card with amber accents fills the right side.

## Media

- **Plate:** `https://d2ol7oe51mr4n9.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/e781b542-a83d-4cf2-a66a-44085485865d.jpg` (2048×1360, 3:2). Looking straight up between glass towers that reflect amber and copper sunset light, a deep blue sky with bright clouds, and a sun flare low on the left. Use `background-size: cover`, centred.
- **Motion:** a muted 4s loop of the same shot covers the plate with the same cover rules: `https://d2ol7oe51mr4n9.cloudfront.net/user_38xzZboKViGWJOttwIXH07lWA1P/197f7e27-faac-4bdc-916c-615ac962bf86.mp4` (1600×1064).
  - The camera glides slowly forward and upward between the towers at a steady speed; clouds drift and the reflections slide.
  - The last second blends into the first, so it loops without a jump and never plays in reverse.
  - Fade it in (0.8s) once its first frame is ready.
- **Readability:** soft shades keep the white type readable: a 150u dark wash from the left, 140u from the top, and a warm `rgba(20,10,0,.38)` → 0 rising 420u from the bottom.