Build a single-file Anime Avatar and OC Studio web app

Overview: Build a production-ready, single-file interactive Anime Character Generator and Original Character (OC) Studio in index.html using modern HTML5, Tailwind CSS, Lucide Icons via CDN, and Google Fonts (Cinzel, Plus Jakarta Sans, and Press Start 2P). Key Specifications: - Layout & Design: Fixed top navigation bar featuring an app logo, version subtitle, Gacha Roll randomization trigger, and an OC Card export button. Styled in a dark theme (#080a10 background) with glassmorphism panels (glass-panel), custom scrollbars, and neon glow effects. - Interactive Components: HTML5 Canvas rendering engine featuring customizable skin tones, eye shapes, iris gradients, mouth expressions, blush levels, multi-style haircuts with dual-color gradients, and head accessories (Neko ears, halos). JRPG dialogue box customizer with live subtitle updates, pre-built character trope presets (Tsundere, Derp, Isekai MC), ambient particle effects (Sakura petals, battle sparks), and a 5-star Gacha randomizer with PNG export functionality.