Design a landing page

Design a landing page for a fictional product called "Nightjar" — an app that turns your rambling voice memos into organized, searchable notes. Single self-contained HTML file: no external assets, fonts, or libraries (system font stacks are fine). Write real marketing copy — no lorem ipsum, no placeholder text. It must look great at desktop width and on a phone. Aim for a visual style you would defend in front of a design director.