---
name: Polar
description: "A strong example of 'Developer Tools' design DNA, using massive typography and strict monochrome to convey technical authority and premium quality."
version: alpha

colors:
  background: "#101011"
  primary: "#FFFFFF"
  secondary: "#71727A"
  neutral: "#4C4F69"
  bg-soft: "#272A2A"
  line: "rgba(29,30,32,1)"

typography:
  display:
    fontFamily: geometric-sans
    fontSize: 64px
    lineHeight: 1.0
    fontWeight: 400
    letterSpacing: "-3.2px"
  h2:
    fontFamily: humanist-sans
    fontSize: 30px
    lineHeight: 1.2
    fontWeight: 400
    letterSpacing: "-0.5px"
  body:
    fontFamily: humanist-sans
    fontSize: 16px
    lineHeight: 1.5
    fontWeight: 400
    letterSpacing: "0px"
  small:
    fontFamily: humanist-sans
    fontSize: 12px
    lineHeight: 1.6
    fontWeight: 400
    letterSpacing: "0px"

rounded:
  sm: 4px
  md: 8px
  lg: 16px
  pill: 9999px

spacing:
  xs: 4px
  sm: 8px
  md: 12px
  lg: 16px
  xl: 24px
  2xl: 32px
  3xl: 48px

---

## Overview

A billing platform for the intelligence era that turns usage into revenue.

*Stripe for usage-based AI billing*

## Colors

High-contrast monochrome with strict hierarchy and zero chromatic distraction.

- **Background (`#101011`)** — uses `bg` token
- **Primary text (`#FFFFFF`)** — uses `ink` token
- **Secondary text (`#71727A`)** — uses `ink-soft` token
- **Muted (`#4C4F69`)** — uses `muted` token
- **Borders (`rgba(29,30,32,1)`)** — uses `line` token

## Typography

- **Display:** geometric-sans
- **Body:** humanist-sans
- **Mono:** geometric-mono

- Display text uses tight negative tracking (-3.2px) to emphasize large-scale geometry.
- Body text relies on default line-height of 1.5 for optimal readability.
- Mono font is reserved strictly for code snippets and technical data.

## Layout

Centered single-column layout for hero with wide horizontal padding (32px).

*Rhythm:* Strict 4px base grid with consistent spacing multiples.

## Elevation & Depth

- 0 0 0 1px rgba(255,255,255,0.1) inset (on primary button)
- none (on flat surfaces)
- Borders: Subtle 1px borders using dark grays (#1D1E20) for separation.

## Shapes

- `sm`: 4px
- `md`: 8px
- `lg`: 16px
- `pill`: 9999px

## Components

- **button:** Primary: pill-shaped, white background, dark text. Secondary: dark gray, pill-shaped, white text.
- **card:** Not visible in provided screenshots.
- **chip:** Not visible in provided screenshots.
- **input:** Not visible in provided screenshots.
- **hero:** Massive centered typography with a two-button CTA group and a logo ticker below.

## Do's and Don'ts

**Don't:**
- don't use bright accent colors — screenshot shows a strict monochrome palette of black, white, and gray
- don't use decorative serifs — screenshot shows a clean, modern geometric sans-serif for display and humanist sans for body
- don't add background textures or gradients — screenshot shows flat, solid dark backgrounds
- don't use small, cramped typography — screenshot shows large, airy display text with tight tracking
- don't use sharp corners on buttons — screenshot shows fully rounded, pill-shaped buttons
- don't clutter the hero with too many elements — screenshot shows a clear hierarchy with only headline, subhead, and two buttons

---

## System Prompt (paste into AI agent)

```
This is a minimalist, dark-themed SaaS landing page for a developer-focused billing platform. The design relies on a strict monochrome palette with a very dark background (#101011), pure white ink (#FFFFFF), and muted grays (#71727A, #4C4F69). Typography is the primary design driver, featuring large, geometric sans-serif headlines with tight tracking (-3.2px) and a humanist sans-serif for body text, alongside a monospace font for technical elements. Critical donts: Do not introduce bright accent colors; the site uses zero chromatic hues. Do not use decorative serifs; keep typography clean and functional. Do not add unnecessary background textures or gradients; maintain flat, solid surfaces. Do not use sharp corners on buttons; always use pill-shaped radii. Do not clutter the layout; embrace generous whitespace and a centered, single-column hero. Do not use small font sizes for headlines; the design prioritizes massive scale and impact.
```