YouTube Music Mobile — decoded design system

music.youtube.com · dark · consumer · deep decode — measured live

YouTube Music 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/music.youtube.com.

Decoded design system

YouTube Music Mobile's decoded design system: background #030303, text #FFFFFF, accent #291A1F, link #065FD4, primary #291A1F; type scale h1 24px / h2 22px / body 14px; 8px spacing base; 12px base radius. The single interactive/action color is #FFFFFF — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #FFFFFF — the single interactive color; only on things you click or must notice, never large fills.
• primary, accent are all #291A1F — one role, not several (the action color).
• accent #291A1F — accent for emphasis — keep it rare on the page.
• link #065FD4 — inline text links and link-styled controls.

Typography

• Heading: Roboto
• Body: Roboto
• h1: 24px
• h2: 22px
• body: 14px

Spacing

• base unit: 8px
• scale: 8px, 16px, 24px, 36px

Radii

• base: 12px
• button: 18px

Motion

Micro-interactions run at 280ms (dominant) with cubic-bezier(0.4, 0, 0.2, 1).

• durations: 280ms
• easings: cubic-bezier(0.4, 0, 0.2, 1)
• animated properties: border, box-shadow

Native design tokens

Button states (measured)

• primary hover: border 1px solid rgba(0, 0, 0, 0) · background #F2F8FF
• primary focus: border 1px solid rgb(6, 95, 212)

Responsive (measured)

• mobile (390px): hero 20px · nav inline

Install it

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

npx shadcn add mozaika.design/r/decode/music.youtube.com

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

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

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

Export: DESIGN.md

# YouTube Music Mobile — Design System

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

## Colors

| Role | Value |
|------|-------|
| bg | `#030303` |
| surface | `#121212` |
| border | `#282828` |
| text | `#FFFFFF` |
| text_muted | `#9F9F9F` |
| primary | `#291A1F` |
| accent | `#291A1F` |
| link | `#065FD4` |
| button_bg | `#FFFFFF` |
| button_text | `#065FD4` |

**Using these colors**

- **Action color** `#FFFFFF` — 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 `#291A1F` — one role, not several.
- **accent** `#291A1F` — accent for emphasis — keep it rare on the page.
- **link** `#065FD4` — inline text links and link-styled controls.
- **Page coverage** (full-page screenshot pixels): `#FFFFFF` 92.3% · `#9F9FA0` 1.9% · `#C3C3C3` 1.8% · `#E2E3E4` 1.7%

## Typography

- Heading: **Roboto**
- Body: **Roboto**

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 24px / 700 · lh 30px |
| body | 14px / 400 · lh 24px |
| small | 12px / 500 · lh 16px · tracking 0.13px |

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

> **Fonts —** Roboto — free, on Google.

## Spacing
- base unit: 8px (inferred from the measured scale)
- measured scale: 8px, 16px, 24px, 36px — snap all gaps/padding to these

## Radius
- base: 12px
- button: 18px
- card: 4px
- pill: 9999px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#FFFFFF` / `#065FD4` | 1px solid rgba(0, 0, 0, 0.1) | 18px | 0px 16px 0px 16px | 500 14px / 0.2px | none |
| secondary | `#0F0F0F` / `#FFFFFF` | 2px solid rgba(0, 0, 0, 0) | 18px | 0px 16px 0px 16px | 500 14px / 0.15px | none |

**States (measured, not guessed)**

- primary hover: border `1px solid rgba(0, 0, 0, 0)` · background `#F2F8FF`
- primary focus: border `1px solid rgb(6, 95, 212)`
- transition: `border 0.28s cubic-bezier(0.4, 0, 0.2, 1)`

## Motion
- durations: 280ms (dominant)
- easings: `cubic-bezier(0.4, 0, 0.2, 1)` (dominant)
- animated properties: border, box-shadow

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 |
|-------|-------|
| `--boq-chrometransition-background` | `#eee` |

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

## Components (measured)
- link: #065FD4 · underline

## Responsive (measured)
- mobile (390px): hero 20px · body 16px · 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.

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

← All decoded design systems

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