MozaikaDesign system

On Running — Design System

light · modern · high · custom · confidence 90% · deep decode

The full decoded design system for On Running: color roles, type scale, spacing, radii and paste-ready DESIGN.md / Tailwind / CSS exports.

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/on-running.

Tokens

On Running's decoded design system: background #FFFFFF, text #000000, accent #2F7EFE, link #2F7EFE, primary #ED0000; type scale h1 32.96px / h2 52.992px / body 32.96px; 4px spacing base; 4px 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

RoleValue
bg#FFFFFF
surface#EFEFEF
border#D8D8D8
text#000000
text_muted#606060
primary#ED0000
accent#2F7EFE
link#2F7EFE
secondary#0000EE
button_bg#FFFFFF
button_text#000000

Using these colors

Typography

Spacing

Radii

Shadows (elevation)

Motion

Micro-interactions run at 300ms (dominant) with ease.

Native design tokens

TokenValue
--f-spinner-color-1#0000001a
--f-spinner-color-2#11181ccc
--sb-width0px
--ticker-height3rem
--adjust-banner-height0px
--f-spinner-width36px
--f-spinner-height36px

Button states (measured)

Layout (measured)

Motion choreography (measured)

Load order: span._container_bdd6m_27×12 → span._container_bdd6m_27 → div._closeButtonContainer_1v → div.onetrust-pc-dark-filter → div.otFloatingRounded → div._logoSection_1xk6q_201

Responsive (measured)

Per-section tokens (8)

Export: DESIGN.md

# On Running — Design System

> light, modern, high, custom — deep decode (measured live)

## Colors

| Role | Value |
|------|-------|
| bg | `#FFFFFF` |
| surface | `#EFEFEF` |
| border | `#D8D8D8` |
| text | `#000000` |
| text_muted | `#606060` |
| primary | `#ED0000` |
| accent | `#2F7EFE` |
| link | `#2F7EFE` |
| secondary | `#0000EE` |
| button_bg | `#FFFFFF` |
| button_text | `#000000` |

**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.
- `accent`, `link` are all `#2F7EFE` — one role, not several.
- **accent** `#2F7EFE` — accent for emphasis — keep it rare on the page.
- **primary** `#ED0000` — a brand color — but the call-to-action uses #FFFFFF, not this.
- **secondary** `#0000EE` — optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two.
- **Page coverage** (full-page screenshot pixels): `#2C2D2C` 28.8% · `#7F7F7F` 24.9% · `#FFFFFF` 22% · `#575D58` 9.9%

## Typography

- Heading: **Noto Sans JP** _(free fallback: Newsreader)_
- Body: **Noto Sans JP** _(free fallback: Newsreader)_
- Mono: **On Semi Mono** _(measured)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 50px / 700 · lh 60px · tracking -0.5px |
| h2 | 33px / 600 · lh 40px |
| h3 | 31px / 400 · lh 40px |
| body | 24px / 700 · lh 29px |
| small | 20px / 700 · lh 30px |
| eyebrow | 12px / 500 · tracking 1.44px |

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

> **Fonts —** Noto Sans JP may be proprietary — safe free fallback: Newsreader (Google Fonts).

## Spacing
- base unit: 4px (inferred from the measured scale)
- measured scale: 2px, 4px, 8px, 12px, 16px, 20px, 24px, 32px, 40px, 48px — snap all gaps/padding to these
- section rhythm: 64px top/bottom padding per section (measured)

## Radius
- base: 4px
- button: 40px
- card: 4px
- sharp: 2px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#000000` / `#FFFFFF` | 1px solid rgb(0, 0, 0) | 40px | 0px 24px 0px 24px | 500 16px | none |
| secondary | `#FFFFFF` / `#000000` | 1px solid rgb(255, 255, 255) | 40px | 0px 24px 0px 24px | 500 16px | none |

**States (measured, not guessed)**

- primary hover: border `1px solid rgb(51, 51, 51)` · background `#333333`

## Shadows (elevation)
- subtle: `rgba(0, 0, 0, 0.05) 0px 0px 0.5px 0px, rgba(0, 0, 0, 0.1) 0px 2px 4px 0px`
- card: `rgba(0, 0, 0, 0.1) -14px 0px 16px 0px`

## Motion
- durations: 300ms (dominant) · 200ms · 500ms
- easings: `ease` (dominant) · `cubic-bezier(0.87, 0, 0.13, 1)`
- animated properties: background, transform, color, 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 |
|-------|-------|
| `--f-spinner-color-1` | `#0000001a` |
| `--f-spinner-color-2` | `#11181ccc` |
| `--sb-width` | `0px` |
| `--ticker-height` | `3rem` |
| `--adjust-banner-height` | `0px` |
| `--f-spinner-width` | `36px` |
| `--f-spinner-height` | `36px` |

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

## Layout (measured)
- container max 650px · common grid: 12-col
- nav: 90px absolute

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 981 | 727 | 12 | — | 0/0 | — |
| 1789 | 685 | 12 | — | 0/0 | — |
| 2555 | 572 | 12 | — | 0/0 | — |
| 3208 | 748 | — | — | 0/0 | — |
| 4037 | 1618 | 12 | — | 0/0 | — |
| 4119 | 610 | 4 | 24 | 0/0 | — |

## Motion choreography (measured)
Load order: `span._container_bdd6m_27`×12 @0ms → `span._container_bdd6m_27` @0ms → `div._closeButtonContainer_1v` @401ms → `div.onetrust-pc-dark-filter` @1303ms → `div.otFloatingRounded` @1303ms → `div._logoSection_1xk6q_201` @2190ms
- `span._container_bdd6m_27` — opacity 0.6→1 — 400ms ease
- `div._navigationItemListSecti` — opacity 0→1 — 250ms ease (delay 100ms)
- `div._logoSection_1xk6q_201` — opacity 0→1 — 250ms ease (delay 100ms)
- `div._closeButtonContainer_1v` — opacity 1→0 — 200ms ease-in (delay 400ms)

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

## Components (measured)
- link: #000000 · no underline
- disabled: bg #FFFFFF · text #000000

## Responsive (measured)
- breakpoints: 768px · 1024px · 1440px
- mobile (390px): 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/on-running

Export: Tailwind v4 (@theme)

@theme {
  /* action color #FFFFFF — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #FFFFFF;
  --color-surface: #EFEFEF;
  --color-border: #D8D8D8;
  --color-text: #000000;
  --color-text-muted: #606060;
  --color-primary: #ED0000;  /* a brand color — but the call-to-action uses #FFFFFF, not this. */
  --color-accent: #2F7EFE;  /* accent for emphasis — keep it rare on the page. */
  --color-link: #2F7EFE;  /* inline text links and link-styled controls. */
  --color-secondary: #0000EE;  /* optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two. */
  --color-button-bg: #FFFFFF;  /* primary-button fill — the main call-to-action color. */
  --color-button-text: #000000;
  /* fonts: Noto Sans JP may be proprietary — safe free fallback: Newsreader (Google Fonts). */
  --font-heading: "Noto Sans JP", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Noto Sans JP", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: "On Semi Mono", ui-monospace, monospace;
  /* measured weights: 400, 500, 600, 700 — use these, not 400/600 */
  --text-hero: 50px; --font-weight-hero: 700; --leading-hero: 60px; --tracking-hero: -0.5px;
  --text-h2: 33px; --font-weight-h2: 600; --leading-h2: 40px;
  --text-h3: 31px; --font-weight-h3: 400; --leading-h3: 40px;
  --text-body: 24px; --font-weight-body: 700; --leading-body: 29px;
  --text-small: 20px; --font-weight-small: 700; --leading-small: 30px;
  --text-eyebrow: 12px; --font-weight-eyebrow: 500; --tracking-eyebrow: 1.44px;
  --radius-base: 4px;
  --radius-button: 40px;
  --radius-card: 4px;
  --radius-sharp: 2px;
  --shadow-card: rgba(0, 0, 0, 0.1) -14px 0px 16px 0px;
  --shadow-subtle: rgba(0, 0, 0, 0.05) 0px 0px 0.5px 0px, rgba(0, 0, 0, 0.1) 0px 2px 4px 0px;
  --color-btn-hover: #333333;  /* measured primary hover fill */
  --ease-brand: ease;
  --duration-fast: 200ms;  /* use: duration-[var(--duration-fast)] */
  --duration-base: 300ms;
  --duration-slow: 500ms;
  --section-y: 64px;  /* per-section vertical padding (measured) */
  --spacing: 4px;  /* measured base — drives the p-*/gap-* scale. steps seen on the page: 2, 4, 8, 12, 16, 20, 24, 32, 40, 48px */
}

Export: CSS variables

:root {
  /* action color #FFFFFF — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #FFFFFF;
  --surface: #EFEFEF;
  --border: #D8D8D8;
  --text: #000000;
  --text-muted: #606060;
  --primary: #ED0000;  /* a brand color — but the call-to-action uses #FFFFFF, not this. */
  --accent: #2F7EFE;  /* accent for emphasis — keep it rare on the page. */
  --link: #2F7EFE;  /* inline text links and link-styled controls. */
  --secondary: #0000EE;  /* optional secondary accent — LOW decode confidence; use rarely (a status color or a single decorative moment) or omit it entirely. Prefer one accent unless the reference clearly shows two. */
  --button-bg: #FFFFFF;  /* primary-button fill — the main call-to-action color. */
  --button-text: #000000;
  --font-heading: "Noto Sans JP", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Noto Sans JP", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: "On Semi Mono", ui-monospace, monospace;
  --text-hero: 50px; --weight-hero: 700; --leading-hero: 60px; --tracking-hero: -0.5px;
  --text-h2: 33px; --weight-h2: 600; --leading-h2: 40px;
  --text-h3: 31px; --weight-h3: 400; --leading-h3: 40px;
  --text-body: 24px; --weight-body: 700; --leading-body: 29px;
  --text-small: 20px; --weight-small: 700; --leading-small: 30px;
  --text-eyebrow: 12px; --weight-eyebrow: 500; --tracking-eyebrow: 1.44px;
  --radius: 4px;
  --radius-button: 40px;
  --radius-card: 4px;
  --radius-sharp: 2px;
  --shadow-card: rgba(0, 0, 0, 0.1) -14px 0px 16px 0px;
  --shadow-subtle: rgba(0, 0, 0, 0.05) 0px 0px 0.5px 0px, rgba(0, 0, 0, 0.1) 0px 2px 4px 0px;
  --btn-bg-hover: #333333;
  --ease: ease;
  --duration-fast: 200ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;
  --section-y: 64px;
}

/* their own tokens, verbatim from the site's :root */
:root {
  --f-spinner-color-1: #0000001a;
  --f-spinner-color-2: #11181ccc;
  --sb-width: 0px;
  --ticker-height: 3rem;
  --adjust-banner-height: 0px;
  --f-spinner-width: 36px;
  --f-spinner-height: 36px;
}
/* fonts: Noto Sans JP may be proprietary — safe free fallback: Newsreader (Google Fonts). */