Vela Ul

Build a single, fully self-contained `index.html` — one file, no build step, no external
requests of any kind (no CDN, no webfonts, no images, no video, no data: URIs). All visuals
must be pure CSS gradients plus inline SVG. Inline all CSS in one <style> in <head> and the
one script in a <script> at the end of <body>.

It is a dark, cinematic hero page for a fictional real-time data platform called "Vela",
built as a FIXED 1690×950 design canvas. The canvas is uniformly scaled to FIT the viewport
at 700px and wider — the composition is preserved verbatim, never re-flowed — and only below
700px does it reflow into a single stacked column.

=== DOCUMENT HEAD ===
<!doctype html>, <html lang="en">