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Palette, type and the app icon

Palette

Each repository takes one Rainbow Book. Its color is the accent on its social preview and of the spine down its left edge, which carries the repository's full name.

Book Format Color Repository
Red CD-DA #ff4d5e D-Modem
Orange CD-R/RW #ff8a3d hardware
Yellow CD-ROM #ffd23d app
Green CD-i #3ddc84 menu
Blue CD Extra #3d8bff bbs
Purple DDCD #a66bff go3270
Scarlet SACD #c8102e gui
White Video CD #f2f4fa brand

Beige (Photo CD) is free for a future repository.

Neutrals: background #0a0f1c, panel #121a2e, text #e8f0ff, muted #7f8bab. Type: Sauce Code Pro, the Nerd Fonts build of Source Code Pro.

App icon

D-Modem app icon

The front of an RJ11 jack, its outline striped in the Rainbow Book colours like the mark, with the white carrier inside. It is drawn on Android's 108-unit adaptive icon canvas; the app's ic_launcher_foreground and ic_launcher_monochrome vector drawables follow tools/app_icon.py.