# RustBox UI

RustBox owns its browser interface under `src/web/`.

Design direction:

- mail-first three-pane layout: folders, message list, message reader;
- compact typography and spacing, small radii, flat surfaces and restrained color use;
- dark, light and system themes;
- compact/comfortable density, preview-pane position and UI scale preferences;
- a single embedded SVG icon sprite for interface actions;
- no Unicode pseudo-icons; the native RustBox style stays flat while compatibility skins may reproduce their source skin treatment;
- HTML compose formatting, threaded reading, folder operations and ManageSieve filters.

The supplied RustProxy source was used as a reference for disciplined asset organization, modular CSS, compact typography and Cargo-driven UI assembly. RustBox does not depend on RustProxy at runtime and retains its own mail-oriented layout and components.

## Build

`build.rs` reads both `src/web/css/manifest.txt` and `src/web/js/manifest.txt`, concatenates each module set in declared order and writes generated CSS/JavaScript bundles to Cargo `OUT_DIR`. `src/ui.rs` embeds those generated bundles together with `index.html` and `icons.svg` into the RustBox executable. The source of truth for browser JavaScript is `src/web/js/`; `src/web/app.js` does not exist.

No Node.js, Bun, TypeScript, React or Next.js build step exists.