Pick a look below and watch every band repaint at once — title bar, tabs, status bar, the page itself — the way Terminal.app themes a window. Eighteen of them ship in the app.
The editor runs on NSTextContentStorage + NSTextLayoutManager — Apple's current, viewport-based text engine — migrated deliberately from the layout-manager wiring most hand-built NSTextViews still default to.
File, Edit, and View are the actual system menu bar — not an in-window lookalike. New, Open, Save, Find, and Share sit in a genuine NSToolbar sharing the title bar with the traffic lights, so every click, shortcut, and VoiceOver label comes straight from AppKit.
An untitled tab you never saved still survives a force-quit — its content is quietly backed up to disk as you type, and handed right back, still marked unsaved, the next time you open the app.
Built and ad-hoc signed entirely from the command line with Swift Package Manager — no .xcodeproj anywhere in the tree, no bundled frameworks in the app either.