YouTube Mobile — decoded design system

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

YouTube 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/youtube.com.

Decoded design system

YouTube Mobile's decoded design system: background #000000, text #000000, accent #E9528F, link #E9528F, primary #E9528F; type scale h1 34px / h2 22px / body 14px; 4px spacing base; 12px base radius. The single interactive/action color is #E9528F — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Using these colors

• Action color #E9528F — the single interactive color; only on things you click or must notice, never large fills.
• primary, accent, link, button_bg are all #E9528F — one role, not several (the action color).
• accent #E9528F — 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

• Heading: Roboto
• Body: Roboto
• h1: 34px
• h2: 22px
• body: 14px

Spacing

• base unit: 4px
• scale: 4px, 6px, 8px, 12px, 14px, 15px, 16px, 18px, 24px, 32px

Radii

• base: 12px
• button: 0px

Shadows (elevation)

• card: rgba(0, 0, 0, 0.14) 0px 16px 24px 2px, rgba(0, 0, 0, 0.12) 0px 6px 30px 5px, rgba(0, 0, 0, 0.4) 0px 8px 10px -5px

Motion

Micro-interactions run at 200ms (dominant) with cubic-bezier(0.05, 0, 0, 1).

• durations: 200ms · 300ms
• easings: cubic-bezier(0.05, 0, 0, 1) · ease
• animated properties: transform, opacity

Native design tokens

…and 110 more measured on the page.

Button states (measured)

• primary hover: border-radius 10px · background rgba(0, 0, 0, 0.05)

Layout (measured)

• nav: 56px

Motion choreography (measured)

Load order: tp-yt-iron-overlay-backdrop.opened

Overlay recipe (measured)

dialog panel: #FFFFFF · radius 2px

Responsive (measured)

• breakpoints: 392px · 527px · 549px · 600px · 656px · 792px
• mobile (390px): hero 14px · nav inline

Install it

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

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

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

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

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

Export: DESIGN.md

# YouTube Mobile — Design System

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

## Colors

| Role | Value |
|------|-------|
| bg | `#000000` |
| surface | `#000000` |
| border | `#000000` |
| text | `#000000` |
| text_muted | `#000000` |
| primary | `#E9528F` |
| accent | `#E9528F` |
| link | `#E9528F` |
| button_bg | `#E9528F` |
| button_text | `#0F0F0F` |

**Using these colors**

- **Action color** `#E9528F` — 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 `#E9528F` — one role, not several (your action color).
- **accent** `#E9528F` — 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): `#B2B2B2` 58% · `#FFFFFF` 34.8% · `#888586` 4.1% · `#EDEDEE` 3.1%

## Typography

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

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| body | 14px / 500 · lh 40px |
| small | 13px / 500 · lh 18px |

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

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

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 4px, 6px, 8px, 12px, 14px, 15px, 16px, 18px, 24px, 32px — snap all gaps/padding to these

## Radius
- base: 12px
- button: 0px
- card: 50px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `rgba(0, 0, 0, 0)` / `#0F0F0F` | none | 0px | 0px 0px 0px 0px | 400 10px | none |
| secondary | `rgba(0, 0, 0, 0)` / `#065FD4` | 1px solid rgba(0, 0, 0, 0.2) | 20px | 0px 15px 0px 15px | 500 14px | none |

**States (measured, not guessed)**

- primary hover: border-radius `10px` · background `rgba(0, 0, 0, 0.05)`

## Shadows (elevation)
- card: `rgba(0, 0, 0, 0.14) 0px 16px 24px 2px, rgba(0, 0, 0, 0.12) 0px 6px 30px 5px, rgba(0, 0, 0, 0.4) 0px 8px 10px -5px`

## Motion
- durations: 200ms (dominant) · 300ms
- easings: `cubic-bezier(0.05, 0, 0, 1)` (dominant) · `ease`
- animated properties: transform, opacity

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 |
|-------|-------|
| `--t7f4f2c6d54836ce0` | `rgba(0,0,0,0.05)` |
| `--t7d8b8e5ee291aec0` | `rgba(255,255,255,0.1)` |
| `--t4726c68ef6d7b08f` | `#deffde` |
| `--tf0a0d1154827847f` | `#ffeacf` |
| `--t3e41d7b17b187f69` | `#fff` |
| `--tff65993384bb4560` | `#c8c9f9` |
| `--t854c79338d8ca8a7` | `#c30027` |
| `--t20480717de80f555` | `rgba(0,0,0,0.1)` |
| `--t2d807bb79e75606d` | `#065fd4` |
| `--t617db776af0de196` | `#0556bf` |
| `--tb628117fc164ad87` | `#3ea6ff` |
| `--td545df04e2c659d7` | `#c30027` |

_…and 108 more measured on the page._

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

## Layout (measured)
- nav: 56px

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 80 | 244 | — | — | 0/0 | — |

## Motion choreography (measured)
Load order: `tp-yt-iron-overlay-backdrop.opened` @0ms
- overlay dialog (auto-opened): panel #FFFFFF · r 2px · shadow rgba(0, 0, 0, 0.14) 0px 16px 24px 2px, rgba(0, 0, 0, 0.12) 0px 6px 30px 5px, rgba(0, 0, 0, 0.4) 0px 8px 10px -5px

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

## Responsive (measured)
- breakpoints: 392px · 527px · 549px · 600px · 656px · 792px
- mobile (390px): hero 14px · body 10px · 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/youtube.com

← All decoded design systems

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