Co-Star — Design System

Name: Co-Star design system
Creator: Mozaika
Keywords: design system, design tokens, Co-Star, light, custom

light · modern · medium · custom · confidence 92%

Co-Star reads the heavens in print type: Romana Book serif at 40px in ash grey #575657, Akkurat Mono at 14px for the ephemeris data, zero-radius buttons (DOWNLOAD IOS in caps), and black-and-white line-art constellations. The astrology app that styles itself like a scientific instrument — mono tables and serif headlines lending mysticism a typographic lab coat.

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/co-star.

Tokens

Co-Star's decoded design system: background #F7F7F7, text #575657, accent #141414, link #337AB7, primary #D0021B; type scale h1 40px / h2 24px / body 14px; 4px spacing base; 4px base radius. The single interactive/action color is #141414 — used only on interactive or must-notice elements (buttons, links, key highlights), never on large fills.

Color roles

Role	Value
bg	`#F7F7F7`
surface	`#EDEDED`
border	`#DFDEDF`
text	`#575657`
text_muted	`#939393`
primary	`#D0021B`
accent	`#141414`
link	`#337AB7`
secondary	`#F6D8D8`
button_bg	`#141414`
button_text	`#FBFBFB`

Using these colors

Action color #141414 — the single interactive color; only on things you click or must notice, never large fills.
accent, button_bg are all #141414 — one role, not several (the action color).
accent #141414 — 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.
primary #D0021B — a brand color — but the call-to-action uses #141414, not this.
link #337AB7 — inline text links and link-styled controls.
secondary #F6D8D8 — 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.

Typography

Heading: Romana Book
Body: Akkurat Mono
h1: 40px
h2: 24px
body: 14px

Spacing

base unit: 4px
scale: 2px, 4px, 6px, 8px, 12px, 16px, 24px, 32px

Radii

base: 4px
button: 0px

Per-section tokens (8)

Export: DESIGN.md

# Co-Star — Design System

> light, modern, medium, custom

Co-Star reads the heavens in print type: Romana Book serif at 40px in ash grey #575657, Akkurat Mono at 14px for the ephemeris data, zero-radius buttons (DOWNLOAD IOS in caps), and black-and-white line-art constellations. The astrology app that styles itself like a scientific instrument — mono tables and serif headlines lending mysticism a typographic lab coat.

## Colors

| Role | Value |
|------|-------|
| bg | `#F7F7F7` |
| surface | `#EDEDED` |
| border | `#DFDEDF` |
| text | `#575657` |
| text_muted | `#939393` |
| primary | `#D0021B` |
| accent | `#141414` |
| link | `#337AB7` |
| secondary | `#F6D8D8` |
| button_bg | `#141414` |
| button_text | `#FBFBFB` |

**Using these colors**

- **Action color** `#141414` — the single interactive color; it appears only on things you click or must notice (buttons, key highlights), never on large fills or backgrounds.
- `accent`, `button_bg` are all `#141414` — one role, not several (your action color).
- **accent** `#141414` — 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.
- **primary** `#D0021B` — a brand color — but the call-to-action uses #141414, not this.
- **link** `#337AB7` — inline text links and link-styled controls.
- **secondary** `#F6D8D8` — 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.

## Typography

- Heading: **Romana Book** _(free fallback: Newsreader)_
- Body: **Akkurat Mono** _(free fallback: JetBrains Mono)_
- h1: 40px
- h2: 24px
- body: 14px

> **Fonts —** Romana Book may be proprietary — safe free fallback: Newsreader (Google Fonts). Akkurat Mono may be proprietary — safe free fallback: JetBrains Mono (Google Fonts).

## Spacing
- base unit: 4px
- scale: 2px, 4px, 6px, 8px, 12px, 16px, 24px, 32px

## Radius
- base: 4px
- button: 0px

## Primary button
- bg `#141414` · text `#FBFBFB` · radius 0px

## 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.

Export: Tailwind v4 (@theme)

@theme {
  /* action color #141414 — the one interactive color; buttons/links/emphasis only, never large fills. */
  --color-bg: #F7F7F7;
  --color-surface: #EDEDED;
  --color-border: #DFDEDF;
  --color-text: #575657;
  --color-text-muted: #939393;
  --color-primary: #D0021B;  /* a brand color — but the call-to-action uses #141414, not this. */
  --color-accent: #141414;  /* 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: #337AB7;  /* inline text links and link-styled controls. */
  --color-secondary: #F6D8D8;  /* 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: #141414;  /* primary-button fill — the main call-to-action color. */
  --color-button-text: #FBFBFB;
  /* fonts: Romana Book may be proprietary — safe free fallback: Newsreader (Google Fonts). Akkurat Mono may be proprietary — safe free fallback: JetBrains Mono (Google Fonts). */
  --font-heading: "Romana Book", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Akkurat Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --text-h1: 40px;
  --text-h2: 24px;
  --text-body: 14px;
  --radius-base: 4px;
  --radius-button: 0px;
  --spacing-1: 2px;
  --spacing-2: 4px;
  --spacing-3: 6px;
  --spacing-4: 8px;
  --spacing-5: 12px;
  --spacing-6: 16px;
  --spacing-7: 24px;
  --spacing-8: 32px;
}

Export: CSS variables

:root {
  /* action color #141414 — the one interactive color; buttons/links/emphasis only, never large fills. */
  --bg: #F7F7F7;
  --surface: #EDEDED;
  --border: #DFDEDF;
  --text: #575657;
  --text-muted: #939393;
  --primary: #D0021B;  /* a brand color — but the call-to-action uses #141414, not this. */
  --accent: #141414;  /* 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: #337AB7;  /* inline text links and link-styled controls. */
  --secondary: #F6D8D8;  /* 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: #141414;  /* primary-button fill — the main call-to-action color. */
  --button-text: #FBFBFB;
  --font-heading: "Romana Book", "Newsreader", system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body: "Akkurat Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --radius: 4px;
  --radius-button: 0px;
}
/* fonts: Romana Book may be proprietary — safe free fallback: Newsreader (Google Fonts). Akkurat Mono may be proprietary — safe free fallback: JetBrains Mono (Google Fonts). */