Build a single-file Aether AI SaaS landing page

Overview: Build a production-ready, single-file interactive SaaS landing page for an autonomous AI agent platform in index.html using Tailwind CSS and Lucide Icons via CDN. Key Specifications: Layout & Design: Fixed top navigation bar with blur backdrop, logo, navigation links, Sign In trigger, and mobile drawer. High-impact hero section featuring animated gradient text, release notification pill, call-to-action buttons, and modern client logos. Styled in a dark theme (#090d16 background) with radial glow accents, frosted glass cards (glass-card), and Plus Jakarta Sans typography. Interactive Components: Interactive terminal preview featuring animated typewriter execution logs, active runtime stats, and a task simulation button. Dynamic ROI calculator with range sliders for team size, hourly rate, and saved hours. Interactive pricing deck with a monthly/annual 20% discount billing toggle. Collapsible FAQ accordion, modal authentication dialog, email waitlist capture form, and a floating toast notification system.