YouTube Music Mobile — Design System

Name: YouTube Music Mobile design system
Creator: Mozaika
Keywords: design system, design tokens, YouTube Music Mobile, dark

dark · consumer · high · confidence 85% · deep decode

YouTube Music Mobile — palette measured from official store listing screenshots (colors only; no font claims). Type scale shown is the platform HIG default.

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/ds/youtube-music-mobile.

Tokens

YouTube Music Mobile's decoded design system: background #030303, text #FFFFFF, accent #291A1F, link #291A1F, primary #291A1F; type scale h1 34px / h2 22px / body 17px; 8px spacing base; 12px base radius. The single interactive/action color is #291A1F — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

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

Using these colors

Action color #291A1F — the single interactive color; only on things you click or must notice, never large fills.
primary, accent, link, button_bg are all #291A1F — one role, not several (the action color).
accent #291A1F — 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.

Typography

h1: 34px
h2: 22px
body: 17px

Spacing

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

Radii

base: 12px
button: 12px

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

Token	Value
`--boq-chrometransition-background`	`#eee`

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

Export: DESIGN.md

# YouTube Music Mobile — Design System

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

YouTube Music Mobile — palette measured from official store listing screenshots (colors only; no font claims). Type scale shown is the platform HIG default.

## Colors

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

**Using these colors**

- **Action color** `#291A1F` — 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`, `link`, `button_bg` are all `#291A1F` — one role, not several (your action color).
- **accent** `#291A1F` — 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.
- **Page coverage** (full-page screenshot pixels): `#FFFFFF` 92.3% · `#9F9FA0` 1.9% · `#C3C3C3` 1.8% · `#E2E3E4` 1.7%

## Typography


| 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.

## 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: 12px
- 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.

---

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

Export: Tailwind v4 (@theme)

@theme {
  /* action color #291A1F — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #030303;
  --color-surface: #121212;
  --color-border: #282828;
  --color-text: #FFFFFF;
  --color-text-muted: #9F9F9F;
  --color-primary: #291A1F;  /* primary brand / action color. */
  --color-accent: #291A1F;  /* 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. */
  --color-link: #291A1F;  /* inline text links — shares the action color. */
  --color-button-bg: #291A1F;  /* primary-button fill — the main call-to-action color. */
  --color-button-text: #030303;
  /* measured weights: 400, 500, 700 — use these, not 400/600 */
  --text-hero: 24px; --font-weight-hero: 700; --leading-hero: 30px;
  --text-body: 14px; --font-weight-body: 400; --leading-body: 24px;
  --text-small: 12px; --font-weight-small: 500; --leading-small: 16px; --tracking-small: 0.13px;
  --radius-base: 12px;
  --radius-button: 12px;
  --radius-card: 4px;
  --radius-pill: 9999px;
  --radius-sharp: 2px;
  --color-btn-hover: #F2F8FF;  /* measured primary hover fill */
  --ease-brand: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 280ms;  /* use: duration-[var(--duration-fast)] */
  --spacing: 8px;  /* measured base — drives the p-*/gap-* scale. steps seen on the page: 8, 16, 24, 36px */
}

Export: CSS variables

:root {
  /* action color #291A1F — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #030303;
  --surface: #121212;
  --border: #282828;
  --text: #FFFFFF;
  --text-muted: #9F9F9F;
  --primary: #291A1F;  /* primary brand / action color. */
  --accent: #291A1F;  /* 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: #291A1F;  /* inline text links — shares the action color. */
  --button-bg: #291A1F;  /* primary-button fill — the main call-to-action color. */
  --button-text: #030303;
  --text-hero: 24px; --weight-hero: 700; --leading-hero: 30px;
  --text-body: 14px; --weight-body: 400; --leading-body: 24px;
  --text-small: 12px; --weight-small: 500; --leading-small: 16px; --tracking-small: 0.13px;
  --radius: 12px;
  --radius-button: 12px;
  --radius-card: 4px;
  --radius-pill: 9999px;
  --radius-sharp: 2px;
  --btn-bg-hover: #F2F8FF;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 280ms;
}

/* their own tokens, verbatim from the site's :root */
:root {
  --boq-chrometransition-background: #eee;
}