Slack Mobile — decoded design system

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

Slack 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/slack.com.

Decoded design system

Slack Mobile's decoded design system: background #FFFFFF, text #000000, accent #7C2852, link #696969, primary #7C2852; type scale h1 76px / h2 64px / body 18px; 4px spacing base; 12px base radius. The single interactive/action color is #611F69 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #611F69 — the single interactive color; only on things you click or must notice, never large fills.
• primary, accent are all #7C2852 — one role, not several (the action color).
• accent #7C2852 — accent for emphasis — keep it rare on the page.
• link #696969 — reads as a neutral UI color, not a link accent — verify against the reference (action = #611F69).

Typography

• Heading: Salesforce-Avant-Garde
• Body: Salesforce-Sans
• h1: 76px
• h2: 64px
• body: 18px

Spacing

• base unit: 4px
• scale: 2px, 4px, 5px, 7px, 8px, 10px, 12px, 16px, 18px, 24px

Radii

• base: 12px
• button: 4px

Shadows (elevation)

• subtle: rgba(0, 0, 0, 0.08) 0px 1px 3px 0px
• card: rgba(0, 0, 0, 0.1) 0px 0px 32px 0px
• overlay: rgba(0, 0, 0, 0.1) 0px 5px 20px 0px

Motion

Micro-interactions run at 420ms (dominant) with cubic-bezier(0.165, 0.84, 0.44, 1).

• durations: 420ms · 200ms · 500ms
• easings: cubic-bezier(0.165, 0.84, 0.44, 1) · linear
• animated properties: transform, box-shadow, color, background

Native design tokens

Button states (measured)

• primary hover: background #4A154B
• primary focus: border-radius 0px · outline 2px dotted rgb(97, 31, 105)

Layout (measured)

• container max-width: 1230px
• common grid: 2 columns

Motion choreography (measured)

Load order: div.progress-bar → div.c-bento-sticky-toc → img.c-accordion-carousel__as×4 → div.comp-customer-videos__ca → h3.comp-customer-videos__ca → div.comp-customer-videos__ca

Scroll reveal: 5 elements rest at opacity 0, animate in over 8000ms.

Responsive (measured)

• breakpoints: 330px · 426px · 527px · 549px · 600px · 896px
• mobile (390px): hero 32px · nav hamburger

Install it

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

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

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

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

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

Export: DESIGN.md

# Slack Mobile — Design System

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

## Colors

| Role | Value |
|------|-------|
| bg | `#FFFFFF` |
| surface | `#EFEFEF` |
| border | `#D8D8D8` |
| text | `#000000` |
| text_muted | `#606060` |
| primary | `#7C2852` |
| accent | `#7C2852` |
| link | `#696969` |
| button_bg | `#611F69` |
| button_text | `#FFFFFF` |

**Using these colors**

- **Action color** `#611F69` — 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 `#7C2852` — one role, not several.
- **accent** `#7C2852` — accent for emphasis — keep it rare on the page.
- **link** `#696969` — reads as a neutral UI color, not a link accent — verify against the reference (action = #611F69).
- **Page coverage** (full-page screenshot pixels): `#FFFFFF` 80.9% · `#EBEAEB` 5.2% · `#2E0541` 3.7% · `#CBC2C9` 3.7% — the action color covers ~3.4% of the page; keep it that scarce.

## Typography

- Heading: **Salesforce-Avant-Garde** _(free fallback: Newsreader)_
- Body: **Salesforce-Sans** _(free fallback: Newsreader)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 76px / 400 |
| h2 | 64px / 700 · lh 72px · tracking -0.77px |
| h3 | 58px / 600 · lh 56px |
| body | 18px / 400 · lh 28px |
| small | 16px / 400 · lh 25px · tracking -0.02px |
| eyebrow | 12px / 700 · tracking 0.68px |

- Weight ladder: 300 · 400 · 600 · 700 — use these exact measured weights, not the 400/600 defaults.

> **Fonts —** Salesforce-Avant-Garde may be proprietary — safe free fallback: Newsreader (Google Fonts). Salesforce-Sans may be proprietary — safe free fallback: Newsreader (Google Fonts).

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 2px, 4px, 5px, 7px, 8px, 10px, 12px, 16px, 18px, 24px — snap all gaps/padding to these
- section rhythm: 80px top/bottom padding per section (measured)

## Radius
- base: 12px
- button: 4px
- card: 16px
- pill: 9999px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#611F69` / `#FFFFFF` | none | 4px | 12px 16px 12px 16px | 700 14px / 0.798px | none |

**States (measured, not guessed)**

- primary hover: background `#4A154B`
- primary focus: border-radius `0px` · outline `2px dotted rgb(97, 31, 105)`
- transition: `box-shadow 0.42s cubic-bezier(0.165, 0.84, 0.44, 1)`

## Shadows (elevation)
- subtle: `rgba(0, 0, 0, 0.08) 0px 1px 3px 0px`
- card: `rgba(0, 0, 0, 0.1) 0px 0px 32px 0px`
- overlay: `rgba(0, 0, 0, 0.1) 0px 5px 20px 0px`

## Motion
- durations: 420ms (dominant) · 200ms · 500ms
- easings: `cubic-bezier(0.165, 0.84, 0.44, 1)` (dominant) · `linear`
- animated properties: transform, box-shadow, color, background

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 |
|-------|-------|
| `--article-theme-primary` | `#4a154b` |
| `--article-theme-secondary` | `#fff` |
| `--sidebar-color` | `#400d40` |
| `--sidebar-highlight-color` | `#1264a3` |
| `--attachment-color` | `#000` |
| `--font-family-monospace` | `"Monaco", "Menlo", "Consolas", "Courier New", monospace` |

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

## Layout (measured)
- container max 1230px · common grid: 2-col
- nav: 0px

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 40 | 1146 | 2 | — | 104/50 | 16/84 |
| 1186 | 863 | — | — | 80/80 | — |
| 1574 | 395 | — | — | 0/0 | — |
| 2177 | 736 | — | — | 48/96 | — |

## Motion choreography (measured)
Load order: `div.progress-bar` @0ms → `div.c-bento-sticky-toc` @529ms → `img.c-accordion-carousel__as`×4 @529ms → `div.comp-customer-videos__ca` @529ms → `h3.comp-customer-videos__ca` @529ms → `div.comp-customer-videos__ca` @2259ms
- scroll reveal: 5 elements rest at opacity 0, animate in over 8000ms (0 revealed during the drive).

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

## Components (measured)
- link: #FFFFFF · no underline
- disabled: bg #FFFFFF · text #000000

## Responsive (measured)
- breakpoints: 330px · 426px · 527px · 549px · 600px · 896px
- mobile (390px): hero 32px · body 16px · nav: hamburger

## 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.

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

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