Co-Star — Design System

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

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; 10px 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

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
• Mono: Akkurat-Mono
• h1: 40px
• h2: 24px
• body: 14px

Spacing

• base unit: 10px
• scale: 10px, 15px, 16px, 20px, 23px, 30px, 40px, 50px, 54px, 60px

Radii

• base: 4px
• button: 0px

Native design tokens

…and 1 more measured on the page.

Button states (measured)

• primary focus: outline 5px auto rgb(16, 16, 16)

Layout (measured)

• nav: 40px fixed

Responsive (measured)

• breakpoints: 353px · 480px · 656px · 768px · 980px · 992px
• mobile (390px): hero 40px · nav hamburger

Per-section tokens (8)

• Hero — light · bg #F7F7F7 · text #7C7C7A · 1 col · left
• Gallery / Showcase — light · bg #F7F7F7 · text #070707 · 1 col · left
• Feature — dark · bg #141414 · text #F8F8F8 · 3 col · split
• Feature — light · bg #FDFDFD · text #8B8B8B · 1 col · left
• Feature — light · bg #FCFBFC · text #E4E4E4 · 2 col · split
• Feature — light · bg #FDFDFD · text #D4D4D4 · 3 col · split
• Testimonial / Social Proof — light · bg #FCFBFC · text #2F2F2F · 1 col · left
• CTA / Sign-up — dark · bg #141414 · text #FFFFFF · 1 col · center

Export: DESIGN.md

# Co-Star — Design System

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

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.
- **Page coverage** (full-page screenshot pixels): `#F7F7F7` 90.6% · `#DADAD9` 5.2% · `#5E5D5C` 4.2%

## Typography

- Heading: **Romana Book** _(free fallback: Newsreader)_
- Body: **Akkurat Mono** _(free fallback: JetBrains Mono)_
- Mono: **Akkurat-Mono** _(measured)_

| Role | Size / weight · line-height · tracking |
|------|------------------------------------------|
| hero | 40px / 400 · lh 40px |
| body | 23px / 400 · lh 26px |
| small | 16px / 400 · lh 30px |

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

> **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: 10px (inferred from the measured scale)
- measured scale: 10px, 15px, 16px, 20px, 23px, 30px, 40px, 50px, 54px, 60px — snap all gaps/padding to these

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

## Buttons

| Button | Fill / text | Border | Radius | Padding | Font | Shadow |
|--------|-------------|--------|--------|---------|------|--------|
| primary | `#141414` / `#FBFBFB` | 1px solid rgb(37, 37, 37) | 0px | 10px 0px 10px 0px | 400 12px | none |
| secondary | `#FBFBFB` / `#252525` | 1px solid rgb(37, 37, 37) | 0px | 10px 0px 10px 0px | 400 12px | none |

**States (measured, not guessed)**

- primary focus: outline `5px auto rgb(16, 16, 16)`

## Their own tokens (verbatim from :root)

| Token | Value |
|-------|-------|
| `--PhoneInput-color--focus` | `#03b2cb` |
| `--PhoneInputCountrySelectArrow-color--focus` | `#03b2cb` |
| `--PhoneInputCountryFlag-borderColor` | `rgba(0,0,0,0.5)` |
| `--PhoneInputCountryFlag-borderColor--focus` | `#03b2cb` |
| `--PhoneInputCountryFlag-backgroundColor--loading` | `rgba(0,0,0,0.1)` |
| `--PhoneInputCountrySelect-marginRight` | `0.35em` |
| `--PhoneInputCountrySelectArrow-width` | `0.3em` |
| `--PhoneInputCountrySelectArrow-marginLeft` | `0.35em` |
| `--PhoneInputCountrySelectArrow-borderWidth` | `1px` |
| `--PhoneInputCountryFlag-height` | `1em` |
| `--PhoneInputCountryFlag-borderWidth` | `1px` |

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

## Layout (measured)
- nav: 40px fixed

## Responsive (measured)
- breakpoints: 353px · 480px · 656px · 768px · 980px · 992px
- mobile (390px): hero 40px · 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/co-star

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;
  --font-mono: "Akkurat-Mono", ui-monospace, monospace;
  /* measured weights: 400 — use these, not 400/600 */
  --text-hero: 40px; --font-weight-hero: 400; --leading-hero: 40px;
  --text-body: 23px; --font-weight-body: 400; --leading-body: 26px;
  --text-small: 16px; --font-weight-small: 400; --leading-small: 30px;
  --radius-base: 4px;
  --radius-button: 0px;
  --outline-focus: 5px auto rgb(16, 16, 16);  /* measured focus ring */
  --spacing: 10px;  /* measured base — drives the p-*/gap-* scale. steps seen on the page: 10, 15, 16, 20, 23, 30, 40, 50, 54, 60px */
}

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;
  --font-mono: "Akkurat-Mono", ui-monospace, monospace;
  --text-hero: 40px; --weight-hero: 400; --leading-hero: 40px;
  --text-body: 23px; --weight-body: 400; --leading-body: 26px;
  --text-small: 16px; --weight-small: 400; --leading-small: 30px;
  --radius: 4px;
  --radius-button: 0px;
  --focus-ring: 5px auto rgb(16, 16, 16);
}

/* their own tokens, verbatim from the site's :root */
:root {
  --PhoneInput-color--focus: #03b2cb;
  --PhoneInputCountrySelectArrow-color--focus: #03b2cb;
  --PhoneInputCountryFlag-borderColor: rgba(0,0,0,0.5);
  --PhoneInputCountryFlag-borderColor--focus: #03b2cb;
  --PhoneInputCountryFlag-backgroundColor--loading: rgba(0,0,0,0.1);
  --PhoneInputCountrySelect-marginRight: 0.35em;
  --PhoneInputCountrySelectArrow-width: 0.3em;
  --PhoneInputCountrySelectArrow-marginLeft: 0.35em;
  --PhoneInputCountrySelectArrow-borderWidth: 1px;
  --PhoneInputCountryFlag-height: 1em;
  --PhoneInputCountryFlag-borderWidth: 1px;
}
/* fonts: Romana Book may be proprietary — safe free fallback: Newsreader (Google Fonts). Akkurat Mono may be proprietary — safe free fallback: JetBrains Mono (Google Fonts). */