MozaikaDesign system

Arc — Design System

light · modern · medium · custom · confidence 92% · deep decode

The full decoded design system for Arc: 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/arc.

Tokens

Arc's decoded design system: background #FFFCEC, text #0A0A0B, accent #2702C2, link #3139FB, primary #2702C2; type scale h1 32px / h2 32px / body 20px; 8px spacing base; 0px base radius. The single interactive/action color is #2702C2 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

RoleValue
bg#FFFCEC
surface#F0EDDE
border#DAD7CA
text#0A0A0B
text_muted#676560
primary#2702C2
accent#2702C2
link#3139FB
button_bg#2702C2
button_text#FFFFFF

Using these colors

Typography

Spacing

Radii

Shadow

rgba(0, 0, 0, 0.1) 0px 5px 5px 0px

Shadows (elevation)

Motion

Micro-interactions run at 150ms (dominant) with ease.

Native design tokens

TokenValue
--colors-primary7#CF3828
--colors-focusOutline#96C4FF
--colors-highContrast#000
--colors-primary6#FA4531
--colors-students-light_grey-hover#D7D6C4
--colors-brandOffwhite#FFFCEC
--colors-secondary4#008279
--colors-secondary2#00C9C3
--colors-brandDeepBlue#2404AA
--colors-lowContrast#FFF

…and 103 more measured on the page.

Button states (measured)

Layout (measured)

Motion choreography (measured)

Load order: div.marquee×2

Responsive (measured)

Per-section tokens (9)

Export: DESIGN.md

# Arc — Design System

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

## Colors

| Role | Value |
|------|-------|
| bg | `#FFFCEC` |
| surface | `#F0EDDE` |
| border | `#DAD7CA` |
| text | `#0A0A0B` |
| text_muted | `#676560` |
| primary | `#2702C2` |
| accent | `#2702C2` |
| link | `#3139FB` |
| button_bg | `#2702C2` |
| button_text | `#FFFFFF` |

**Using these colors**

- **Action color** `#2702C2` — 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`, `button_bg` are all `#2702C2` — one role, not several (your action color).
- **accent** `#2702C2` — 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** `#3139FB` — inline text links and link-styled controls.
- **Page coverage** (full-page screenshot pixels): `#3E45FA` 48.7% · `#CC97A7` 13.7% · `#F7EDEB` 10.8% · `#CCD1D0` 10.3%

## Typography

- Heading: **Marlin Soft** _(free fallback: Newsreader)_
- Body: **Segoe UI** _(free fallback: Newsreader)_
- Mono: **ABC Favorit Mono** _(measured)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 46px / 700 · lh 42px · tracking -1.82px |
| h2 | 40px / 700 · lh 39px · tracking -1.6px |
| h3 | 36px / 700 · lh 36px · tracking -0.72px |
| body | 16px / 700 |
| small | 14px / 500 · lh 29px · tracking -0.28px |
| eyebrow | 12px / 700 · tracking 0.6px |

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

> **Fonts —** Marlin Soft may be proprietary — safe free fallback: Newsreader (Google Fonts). Segoe UI may be proprietary — safe free fallback: Newsreader (Google Fonts).

## Spacing
- base unit: 8px (inferred from the measured scale)
- measured scale: 3px, 4px, 6px, 8px, 10px, 12px, 16px, 20px, 24px, 32px — snap all gaps/padding to these
- section rhythm: 128px top/bottom padding per section (measured)

## Radius
- base: 0px
- button: 10px
- card: 8px

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#2702C2` / `#FFFFFF` | none | 10px | 8px 0px 8px 0px | 600 14px / -0.14px | rgba(0, 0, 0, 0.1) 0px 5px 5px 0px |
| secondary | `#FFFFFF` / `#2702C2` | none | 10px | 8px 0px 8px 0px | 600 14px / -0.14px | rgba(0, 0, 0, 0.1) 0px 5px 5px 0px |

**States (measured, not guessed)**

- primary hover: box-shadow `rgba(0, 0, 0, 0.2) 0px 7px 15px 0px` · transform `matrix(1.02, 0, 0, 1.02, 0, 0)`
- primary focus: box-shadow `rgba(0, 0, 0, 0.1) 0px 2px 6px 0px` · outline `2px solid rgb(150, 196, 255)` · transform `matrix(1.02, 0, 0, 1.02, 0, 0)`
- secondary hover: box-shadow `rgba(0, 0, 0, 0.2) 0px 7px 15px 0px` · transform `matrix(1.02, 0, 0, 1.02, 0, 0)`
- transition: `transform 0.15s ease`

## Shadows (elevation)
- card: `rgba(0, 0, 0, 0.1) 0px 5px 5px 0px`
- button: `rgba(0, 0, 0, 0.1) 0px 5px 5px 0px`

## Motion
- durations: 150ms (dominant) · 200ms · 100ms
- easings: `ease` (dominant) · `ease-out`
- animated properties: transform, background, box-shadow, 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 |
|-------|-------|
| `--colors-primary7` | `#CF3828` |
| `--colors-focusOutline` | `#96C4FF` |
| `--colors-highContrast` | `#000` |
| `--colors-primary6` | `#FA4531` |
| `--colors-students-light_grey-hover` | `#D7D6C4` |
| `--colors-brandOffwhite` | `#FFFCEC` |
| `--colors-secondary4` | `#008279` |
| `--colors-secondary2` | `#00C9C3` |
| `--colors-brandDeepBlue` | `#2404AA` |
| `--colors-lowContrast` | `#FFF` |
| `--colors-students-light_green` | `#D3E081` |
| `--colors-primary4` | `#FC8279` |

_…and 101 more measured on the page._

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

## Layout (measured)
- container max 1440px
- nav: 36px

| Section (y) | Height | Cols | Gap | Pad y | Split |
|---|---|---|---|---|---|
| 90 | 617 | — | — | 72/0 | — |
| 707 | 920 | — | — | 0/0 | — |
| 1822 | 1080 | — | — | 0/0 | — |
| 2902 | 1041 | — | — | 0/0 | — |
| 3942 | 1041 | — | — | 0/0 | — |

## Motion choreography (measured)
Load order: `div.marquee`×2 @0ms

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

## Components (measured)
- link: #FFFADD · no underline

## Responsive (measured)
- breakpoints: 480px · 600px · 650px · 800px · 960px · 1075px
- mobile (390px): hero 32px · body 16px · nav: hamburger

## 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/arc

Export: Tailwind v4 (@theme)

@theme {
  /* action color #2702C2 — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #FFFCEC;
  --color-surface: #F0EDDE;
  --color-border: #DAD7CA;
  --color-text: #0A0A0B;
  --color-text-muted: #676560;
  --color-primary: #2702C2;  /* primary brand / action color. */
  --color-accent: #2702C2;  /* 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: #3139FB;  /* inline text links and link-styled controls. */
  --color-button-bg: #2702C2;  /* primary-button fill — the main call-to-action color. */
  --color-button-text: #FFFFFF;
  /* fonts: Marlin Soft may be proprietary — safe free fallback: Newsreader (Google Fonts). Segoe UI may be proprietary — safe free fallback: Newsreader (Google Fonts). */
  --font-heading: "Marlin Soft", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Segoe UI", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: "ABC Favorit Mono", ui-monospace, monospace;
  /* measured weights: 400, 500, 600, 700 — use these, not 400/600 */
  --text-hero: 46px; --font-weight-hero: 700; --leading-hero: 42px; --tracking-hero: -1.82px;
  --text-h2: 40px; --font-weight-h2: 700; --leading-h2: 39px; --tracking-h2: -1.6px;
  --text-h3: 36px; --font-weight-h3: 700; --leading-h3: 36px; --tracking-h3: -0.72px;
  --text-body: 16px; --font-weight-body: 700;
  --text-small: 14px; --font-weight-small: 500; --leading-small: 29px; --tracking-small: -0.28px;
  --text-eyebrow: 12px; --font-weight-eyebrow: 700; --tracking-eyebrow: 0.6px;
  --radius-base: 0px;
  --radius-button: 10px;
  --radius-card: 8px;
  --shadow-card: rgba(0, 0, 0, 0.1) 0px 5px 5px 0px;
  --shadow-focus: rgba(0, 0, 0, 0.1) 0px 2px 6px 0px;  /* measured focus ring */
  --ease-brand: ease;
  --duration-fast: 100ms;  /* use: duration-[var(--duration-fast)] */
  --duration-base: 150ms;
  --duration-slow: 200ms;
  --section-y: 128px;  /* per-section vertical padding (measured) */
  --spacing: 8px;  /* measured base — drives the p-*/gap-* scale. steps seen on the page: 3, 4, 6, 8, 10, 12, 16, 20, 24, 32px */
}

Export: CSS variables

:root {
  /* action color #2702C2 — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #FFFCEC;
  --surface: #F0EDDE;
  --border: #DAD7CA;
  --text: #0A0A0B;
  --text-muted: #676560;
  --primary: #2702C2;  /* primary brand / action color. */
  --accent: #2702C2;  /* 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: #3139FB;  /* inline text links and link-styled controls. */
  --button-bg: #2702C2;  /* primary-button fill — the main call-to-action color. */
  --button-text: #FFFFFF;
  --font-heading: "Marlin Soft", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Segoe UI", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: "ABC Favorit Mono", ui-monospace, monospace;
  --text-hero: 46px; --weight-hero: 700; --leading-hero: 42px; --tracking-hero: -1.82px;
  --text-h2: 40px; --weight-h2: 700; --leading-h2: 39px; --tracking-h2: -1.6px;
  --text-h3: 36px; --weight-h3: 700; --leading-h3: 36px; --tracking-h3: -0.72px;
  --text-body: 16px; --weight-body: 700;
  --text-small: 14px; --weight-small: 500; --leading-small: 29px; --tracking-small: -0.28px;
  --text-eyebrow: 12px; --weight-eyebrow: 700; --tracking-eyebrow: 0.6px;
  --radius: 0px;
  --radius-button: 10px;
  --radius-card: 8px;
  --shadow-card: rgba(0, 0, 0, 0.1) 0px 5px 5px 0px;
  --focus-ring: rgba(0, 0, 0, 0.1) 0px 2px 6px 0px;
  --ease: ease;
  --duration-fast: 100ms;
  --duration-base: 150ms;
  --duration-slow: 200ms;
  --section-y: 128px;
}

/* their own tokens, verbatim from the site's :root */
:root {
  --colors-primary7: #CF3828;
  --colors-focusOutline: #96C4FF;
  --colors-highContrast: #000;
  --colors-primary6: #FA4531;
  --colors-students-light_grey-hover: #D7D6C4;
  --colors-brandOffwhite: #FFFCEC;
  --colors-secondary4: #008279;
  --colors-secondary2: #00C9C3;
  --colors-brandDeepBlue: #2404AA;
  --colors-lowContrast: #FFF;
  --colors-students-light_green: #D3E081;
  --colors-primary4: #FC8279;
}
/* fonts: Marlin Soft may be proprietary — safe free fallback: Newsreader (Google Fonts). Segoe UI may be proprietary — safe free fallback: Newsreader (Google Fonts). */