Trello Mobile — decoded design system

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

Trello 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.

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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/trello.com.

Decoded design system

Trello Mobile's decoded design system: background #FFFFFF, text #091E42, accent #0065FF, link #0052CC, primary #0065FF; type scale h1 48px / h2 36px / body 20px; 8px spacing base; 12px base radius. The single interactive/action color is #0065FF — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #0065FF — the single interactive color; only on things you click or must notice, never large fills.
• primary, accent, button_bg are all #0065FF — one role, not several (the action color).
• accent #0065FF — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
• link #0052CC — inline text links and link-styled controls.

Typography

• Heading: Charlie Display
• Body: Charlie Text
• h1: 48px
• h2: 36px
• body: 20px

Spacing

• base unit: 8px
• scale: 4px, 8px, 10px, 11px, 12px, 13px, 16px, 20px, 24px, 32px

Radii

• base: 12px
• button: 4.8px

Shadows (elevation)

• card: rgba(9, 30, 66, 0.2) 0px 3px 5px 0px, rgba(9, 30, 66, 0.31) 0px 0px 1px 0px
• overlay: rgba(9, 30, 66, 0.15) 0px 8px 16px 0px

Motion

Micro-interactions run at 250ms (dominant) with ease.

• durations: 250ms · 300ms · 150ms
• easings: ease · ease-out
• animated properties: margin-left, background-color, box-shadow, transform

Native design tokens

Button states (measured)

• primary hover: border 1px solid rgb(7, 71, 166) · background #0747A6
• primary focus: border 1px solid rgb(7, 71, 166) · box-shadow rgba(122, 134, 154, 0.5) 0px 0px 0px 3.2px · background #0747A6 · outline 2px solid rgb(9, 30, 66)

Layout (measured)

• container max-width: 1140px
• common grid: 3 columns

Motion choreography (measured)

Load order: div×2 → div.otFlat

Overlay recipe (measured)

dialog panel: rgba(0, 0, 0, 0) · radius 0px

Input (measured)

height 49.9844px · radius 4.8px · focus ring 2px solid rgb(9, 30, 66)

Responsive (measured)

• 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/trello.com

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

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

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

Export: DESIGN.md

# Trello Mobile — Design System

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

## Colors

| Role | Value |
|------|-------|
| bg | `#FFFFFF` |
| surface | `#F0F1F3` |
| border | `#DADDE2` |
| text | `#091E42` |
| text_muted | `#667389` |
| primary | `#0065FF` |
| accent | `#0065FF` |
| link | `#0052CC` |
| button_bg | `#0065FF` |
| button_text | `#FFFFFF` |

**Using these colors**

- **Action color** `#0065FF` — 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`, `button_bg` are all `#0065FF` — one role, not several (your action color).
- **accent** `#0065FF` — THE accent / action color — interactive & must-notice only (buttons, links, focus, one key highlight); never large fills or backgrounds. Scarcity is what makes it read as designed.
- **link** `#0052CC` — inline text links and link-styled controls.
- **Page coverage** (full-page screenshot pixels): `#F4F5F7` 93.8% · `#95A9C8` 6.2%

## Typography

- Heading: **Charlie Display** _(free fallback: Newsreader)_
- Body: **Charlie Text** _(free fallback: Newsreader)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 48px / 500 · lh 60px |
| h2 | 36px / 500 · lh 48px |
| body | 20px / 400 · lh 30px |
| small | 19px / 400 · lh 29px |

- Weight ladder: 400 · 500 · 600 · 700 — use these exact measured weights, not the 400/600 defaults.

> **Fonts —** Charlie Display may be proprietary — safe free fallback: Newsreader (Google Fonts). Charlie Text may be proprietary — safe free fallback: Newsreader (Google Fonts).

## Spacing
- base unit: 8px (inferred from the measured scale)
- measured scale: 4px, 8px, 10px, 11px, 12px, 13px, 16px, 20px, 24px, 32px — snap all gaps/padding to these

## Radius
- base: 12px
- button: 4.8px
- card: 4px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#0065FF` / `#FFFFFF` | 1px solid rgb(0, 101, 255) | 4.8px | 11.2px 16px 12.8px 16px | 400 16px | none |
| secondary | `#FFFFFF` / `#172B4D` | 1px solid rgb(255, 171, 0) | 2px | 12px 10px 12px 10px | 600 13.008px / 0.13008px | none |

**States (measured, not guessed)**

- primary hover: border `1px solid rgb(7, 71, 166)` · background `#0747A6`
- primary focus: border `1px solid rgb(7, 71, 166)` · box-shadow `rgba(122, 134, 154, 0.5) 0px 0px 0px 3.2px` · background `#0747A6` · outline `2px solid rgb(9, 30, 66)`
- transition: `all 0.25s ease-out`

## Shadows (elevation)
- card: `rgba(9, 30, 66, 0.2) 0px 3px 5px 0px, rgba(9, 30, 66, 0.31) 0px 0px 1px 0px`
- overlay: `rgba(9, 30, 66, 0.15) 0px 8px 16px 0px`

## Motion
- durations: 250ms (dominant) · 300ms · 150ms
- easings: `ease` (dominant) · `ease-out`
- animated properties: margin-left, background-color, box-shadow, transform

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 |
|-------|-------|
| `--atlassian-recommended-system-fonts` | `-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, "Fira Sans", "Droid Sans", "Helvetica Neue", sans` |
| `--atlassian-recommended-sans-system-fonts` | `ui-sans-serif, -apple-system, "system-ui", "Segoe UI", Ubuntu, "Helvetica Neue", sans-serif` |
| `--atlassian-sans-font-family` | `"Atlassian Sans", ui-sans-serif, -apple-system, "system-ui", "Segoe UI", Ubuntu, "Helvetica Neue", sans-serif` |

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

## Layout (measured)
- container max 1140px · common grid: 3-col
- nav: 0px fixed · bg rgba(9, 30, 66, 0)

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 144 | 740 | 2 | — | 0/0 | — |
| 884 | 796 | — | — | 0/0 | — |
| 1047 | 633 | — | — | 0/0 | — |
| 1680 | 932 | 3 | — | 0/0 | 25/38/38 |
| 2921 | 419 | 3 | — | 0/0 | — |
| 3388 | 567 | — | — | 0/0 | — |
| 3955 | 226 | — | — | 0/0 | — |
| 4181 | 356 | — | — | 0/0 | — |

## Motion choreography (measured)
Load order: `div`×2 @0ms → `div.otFlat` @1053ms
- overlay dialog (auto-opened): panel rgba(0, 0, 0, 0) · r 0px

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

## Components (measured)
- input: h 49.9844px · r 4.8px · border 1px solid rgb(223, 225, 230) · bg #FFFFFF · placeholder #97A0AF
  - focus ring: `2px solid rgb(9, 30, 66)` — this exact construction, don't invent your own
- link: #0052CC · no underline — hover #0747A6

## Responsive (measured)
- mobile (390px): hero 32px · body 20px · 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/trello.com

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