GitHub Mobile — decoded design system

github.com · light · consumer · deep decode — measured live

GitHub Mobile's design system, decoded live by Mozaika: measured color roles, type scale, buttons with real hover/focus states, motion and the brand's own tokens.

Open in Mozaika →

This is a static, crawlable rendering for search & AI engines. The interactive version — filters, live decode console, copy & export — is at https://mozaika.design/decode/github.com.

Decoded design system

GitHub Mobile's decoded design system: background #0D1117, text #F0F6FC, accent #6839BE, link #000000, primary #6839BE; type scale h1 64px / h2 40px / body 18px; 4px spacing base; 12px base radius. The single interactive/action color is #08872B — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #08872B — the single interactive color; only on things you click or must notice, never large fills.
• primary, accent are all #6839BE — one role, not several (the action color).
• accent #6839BE — accent for emphasis — keep it rare on the page.
• link #000000 — fails contrast on the background (~1.1:1) — this is a dark UI color, NOT a readable link; use the text or action color for links (verify against the reference).

Typography

• Heading: Mona Sans
• Body: Mona Sans
• h1: 64px
• h2: 40px
• body: 18px

Spacing

• base unit: 4px
• scale: 2px, 3px, 4px, 8px, 12px, 16px, 20px, 24px, 32px, 48px

Radii

• base: 12px
• button: 6px

Motion

Micro-interactions run at 200ms (dominant) with cubic-bezier(0.165, 0.84, 0.44, 1).

• durations: 200ms · 300ms · 800ms
• easings: cubic-bezier(0.165, 0.84, 0.44, 1) · ease-out
• animated properties: transform, opacity, color, background-color

Native design tokens

…and 110 more measured on the page.

Button states (measured)

• primary hover: background color(srgb 0.0263529 0.444706 0.141647)
• primary focus: outline 4px solid rgb(3, 119, 255)

Layout (measured)

• container max-width: 1280px
• nav: 72px absolute
• common grid: 12 columns

Motion choreography (measured)

Load order: div.lp-Intro → div.Primer_Brand__LogoSuite-×2 → p.Primer_Brand__Text-modul×2 → p.Primer_Brand__Text-modul×2 → div.BackToTop×2

Scroll reveal: 15 elements rest at opacity 0, translateY(24px), animate in over 0.8s cubic-bezier(0.2, 0.4, 0.2, 1).

Stagger: div ×3 — 100ms apart.

Input (measured)

height 41px · radius 8px

Responsive (measured)

• breakpoints: 544px · 750px · 768px · 804px · 1011px · 1280px
• mobile (390px): hero 32px · nav inline

Install it

Drop this measured system into any shadcn/Tailwind project in one command:

npx shadcn add mozaika.design/r/decode/github.com

Or as a Meta Astryx theme — a ready defineTheme file with the measured hover/press states baked in:

curl -o src/themes/github.theme.ts https://mozaika.design/api/astryx/decode/github.com.ts

registry item · astryx theme · or query it over MCP: get_design_system("GitHub Mobile")

Export: DESIGN.md

# GitHub Mobile — Design System

> light, consumer, high — deep decode (measured live)

## Colors

| Role | Value |
|------|-------|
| bg | `#0D1117` |
| surface | `#1A1E24` |
| border | `#2F3339` |
| text | `#F0F6FC` |
| text_muted | `#999EA4` |
| primary | `#6839BE` |
| accent | `#6839BE` |
| link | `#000000` |
| button_bg | `#08872B` |
| button_text | `#FFFFFF` |

**Using these colors**

- **Action color** `#08872B` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `primary`, `accent` are all `#6839BE` — one role, not several.
- **accent** `#6839BE` — accent for emphasis — keep it rare on the page.
- **link** `#000000` — fails contrast on the background (~1.1:1) — this is a dark UI color, NOT a readable link; use the text or action color for links (verify against the reference).
- **Page coverage** (full-page screenshot pixels): `#0F103B` 65% · `#332E7A` 13.7% · `#191851` 11.3% · `#918DC8` 10%

## Typography

- Heading: **Mona Sans** _(free fallback: Newsreader)_
- Body: **Mona Sans** _(free fallback: Newsreader)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 64px / 425 · lh 69px · tracking -2.24px |
| h2 | 40px / 460 · lh 48px |
| h3 | 22px / 480 · lh 31px |
| body | 18px / 400 · lh 27px · tracking 0.18px |
| small | 16px / 400 · lh 24px · tracking 0.24px |

- Weight ladder: 400 · 460 · 480 · 500 · 600 — use these exact measured weights, not the 400/600 defaults.

> **Fonts —** Mona Sans may be proprietary — safe free fallback: Newsreader (Google Fonts).

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 2px, 3px, 4px, 8px, 12px, 16px, 20px, 24px, 32px, 48px — snap all gaps/padding to these
- section rhythm: 64px top/bottom padding per section (measured)

## Radius
- base: 12px
- button: 6px
- card: 6px
- pill: 9999px
- sharp: 3px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#08872B` / `#FFFFFF` | 1px solid rgba(0, 0, 0, 0) | 6px | 6px 20px 6px 20px | 400 16px | none |
| secondary | `rgba(0, 0, 0, 0)` / `#FFFFFF` | 1px solid rgb(209, 217, 224) | 6px | 4px 12px 4px 12px | 400 14px | none |

**States (measured, not guessed)**

- primary hover: background `color(srgb 0.0263529 0.444706 0.141647)`
- primary focus: outline `4px solid rgb(3, 119, 255)`
- transition: `background-color 0.48s cubic-bezier(0.165, 0.84, 0.44, 1)`

## Motion
- durations: 200ms (dominant) · 300ms · 800ms
- easings: `cubic-bezier(0.165, 0.84, 0.44, 1)` (dominant) · `ease-out`
- animated properties: transform, opacity, color, background-color

Micro-interactions use the dominant duration + easing; nothing on the page animates slower than the longest duration above — don't invent springier motion.

## Their own tokens (verbatim from :root)

| Token | Value |
|-------|-------|
| `--color-workflow-card-bg` | `#151b23` |
| `--color-workflow-card-header-shadow` | `#1b1f230a` |
| `--color-bg-discussions-row-emoji-box` | `#57606a` |
| `--color-notifications-row-read-bg` | `#0d1117` |
| `--color-notifications-row-bg` | `#151b23` |
| `--color-user-mention-fg` | `#d29922` |
| `--color-mktg-btn-shadow-outline` | `#ffffff40 0 0 0 1px inset` |
| `--color-marketing-icon-primary` | `#79c0ff` |
| `--color-marketing-icon-secondary` | `#1f6feb` |
| `--color-project-header-bg` | `#0d1117` |
| `--color-project-sidebar-bg` | `#161b22` |
| `--color-project-gradient-in` | `#161b22` |

_…and 108 more measured on the page._

Prefer these names when extending their system — it's the brand's actual vocabulary.

## Layout (measured)
- container max 1280px · common grid: 12-col
- nav: 72px absolute

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 0 | 1907 | — | — | 0/0 | — |
| 166 | 209 | 12 | 48 | 0/0 | — |
| 1907 | 2276 | — | — | 0/0 | — |
| 2388 | 658 | — | — | 0/0 | — |
| 3047 | 577 | 12 | — | 0/0 | — |
| 3624 | 559 | 12 | — | 0/0 | — |
| 4183 | 1888 | — | — | 0/0 | — |
| 4430 | 172 | — | — | 0/0 | — |

## Motion choreography (measured)
Load order: `div.lp-Intro` @0ms → `div.Primer_Brand__LogoSuite-`×2 @1ms → `p.Primer_Brand__Text-modul`×2 @382ms → `p.Primer_Brand__Text-modul`×2 @382ms → `div.BackToTop`×2 @382ms
- stagger: `div` ×3 — 100ms apart
- scroll reveal: 15 elements rest at opacity 0, translateY(24px), animate in over 0.8s cubic-bezier(0.2, 0.4, 0.2, 1) (12 revealed during the drive).

Rebuild the timeline, not just the durations — order, delays and staggers above are the choreography.

## Components (measured)
- input: h 41px · r 8px · bg rgba(0, 0, 0, 0) · placeholder #58635B
- link: #8DD6FF · no underline

## Responsive (measured)
- breakpoints: 544px · 750px · 768px · 804px · 1011px · 1280px
- mobile (390px): hero 32px · body 14px · nav: inline

## How to apply
Paste the Tailwind `@theme` (or CSS variables) as your base, then build each
section to its spec — verify every color, radius, and font against these tokens.
Hover/focus states, shadows and motion timings above are measured from the live page — match them exactly, don't re-guess them.

---

> **Decoded with Mozaika** — measured live, not guessed. Full decoded design system + one-command install: mozaika.design/decode/github.com

← All decoded design systems

An automated reading of GitHub Mobile's publicly-visible CSS (colors, fonts, spacing, motion) — not affiliated with github.com. No screenshots stored. Removal requests: hello@mozaika.design.