Vela Terms Hero — Référence de design web et prompt

# Prompt: Vela "in your terms" hero

Build a single-file, one-screen hero for a fictional privacy app, **vela**: a secure messaging app, crypto wallet and Web3 browser. Use plain HTML, CSS and vanilla JS, with no framework and no build step. The look is soft and warm: a grainy pastel gradient panel and a huge tight grotesk headline. The first word cycles through four verbs, each with its own glossy 3D icon, and the panel's colour changes with every word. A cream stats strip with a curved notch sits underneath.