# GroupGPT Brand System > The canonical GroupGPT brand system. Monochrome grayscale, dark-first, "lux not crunchy." > There is no hue accent anywhere in the product. The `--purple-*` tokens are legacy aliases > resolving to black/graphite/grey — read values, never token names. Tagline: The social AI ## Spec - [brand.md](https://branding.groupgpt.tech/brand.md): Complete brand system in Markdown — logo, type, color tokens, layout, design language, copy voice, agent rules. - [agent-rules.md](https://branding.groupgpt.tech/agent-rules.md): The ten maintenance rules plus a paste-ready constraint block for agent prompts. ## Tokens - [tokens.json](https://branding.groupgpt.tech/tokens.json): All tokens as structured JSON with usage notes and legacy-alias flags. - [tokens.css](https://branding.groupgpt.tech/tokens.css): Drop-in `:root` block matching the shipping app. ## Assets - [logo.png](https://branding.groupgpt.tech/assets/logo.png): 1080x1080 RGBA master mark. Always rendered as a circle. ## Upstream sources of truth - `GGPT/GroupGPT Branding.md` — branding vault note (written spec) - `ggpt-cortex/src/index.css` + `src/App.css` — live tokens, wins any disagreement - The running app — final arbiter; screenshot before styling