YouTube Mobile — Design System

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

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

YouTube 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-mobile.

Tokens

YouTube Mobile's decoded design system: background #000000, text #FFFFFF, accent #E9528F, link #E9528F, primary #E9528F; type scale h1 34px / h2 22px / body 17px; 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

Role	Value
bg	`#000000`
surface	`#0F0F0F`
border	`#262626`
text	`#FFFFFF`
text_muted	`#9E9E9E`
primary	`#E9528F`
accent	`#E9528F`
link	`#E9528F`
button_bg	`#E9528F`
button_text	`#000000`

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

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

Spacing

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

Radii

base: 12px
button: 12px

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

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`

…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

Export: DESIGN.md

# YouTube Mobile — Design System

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

YouTube 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 | `#000000` |
| surface | `#0F0F0F` |
| border | `#262626` |
| text | `#FFFFFF` |
| text_muted | `#9E9E9E` |
| primary | `#E9528F` |
| accent | `#E9528F` |
| link | `#E9528F` |
| button_bg | `#E9528F` |
| button_text | `#000000` |

**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


| 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.

## 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: 12px
- card: 50px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `rgba(0, 0, 0, 0)` / `#0F0F0F` | none | 12px | 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.

---

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

Export: Tailwind v4 (@theme)

@theme {
  /* action color #E9528F — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #000000;
  --color-surface: #0F0F0F;
  --color-border: #262626;
  --color-text: #FFFFFF;
  --color-text-muted: #9E9E9E;
  --color-primary: #E9528F;  /* primary brand / action color. */
  --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. */
  --color-link: #E9528F;  /* inline text links — shares the action color. */
  --color-button-bg: #E9528F;  /* primary-button fill — the main call-to-action color. */
  --color-button-text: #000000;
  /* measured weights: 400, 500 — use these, not 400/600 */
  --text-body: 14px; --font-weight-body: 500; --leading-body: 40px;
  --text-small: 13px; --font-weight-small: 500; --leading-small: 18px;
  --radius-base: 12px;
  --radius-button: 12px;
  --radius-card: 50px;
  --radius-sharp: 2px;
  --shadow-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;
  --color-btn-hover: rgba(0, 0, 0, 0.05);  /* measured primary hover fill */
  --ease-brand: cubic-bezier(0.05, 0, 0, 1);
  --duration-fast: 200ms;  /* use: duration-[var(--duration-fast)] */
  --duration-base: 300ms;
  --spacing: 4px;  /* measured base — drives the p-*/gap-* scale. steps seen on the page: 4, 6, 8, 12, 14, 15, 16, 18, 24, 32px */
}

Export: CSS variables

:root {
  /* action color #E9528F — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #000000;
  --surface: #0F0F0F;
  --border: #262626;
  --text: #FFFFFF;
  --text-muted: #9E9E9E;
  --primary: #E9528F;  /* primary brand / 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. */
  --link: #E9528F;  /* inline text links — shares the action color. */
  --button-bg: #E9528F;  /* primary-button fill — the main call-to-action color. */
  --button-text: #000000;
  --text-body: 14px; --weight-body: 500; --leading-body: 40px;
  --text-small: 13px; --weight-small: 500; --leading-small: 18px;
  --radius: 12px;
  --radius-button: 12px;
  --radius-card: 50px;
  --radius-sharp: 2px;
  --shadow-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;
  --btn-bg-hover: rgba(0, 0, 0, 0.05);
  --ease: cubic-bezier(0.05, 0, 0, 1);
  --duration-fast: 200ms;
  --duration-base: 300ms;
}

/* their own tokens, verbatim from the site's :root */
:root {
  --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;
}