---
name: StackBlitz
description: "This site is a great example of a premium developer tool aesthetic, balancing high-impact typography with a focused, distraction-free dark environment."
version: alpha

colors:
  background: "#0f1014"
  primary: "#ffffff"
  secondary: "rgba(255,255,255,0.8)"
  tertiary: "#00a8db"
  neutral: "#a1a5b0"
  bg-soft: "#151619"
  bg-quiet: "#1c1f25"
  muted-soft: "rgba(255,255,255,0.7)"
  line: "rgba(255,255,255,0.12)"

typography:
  display:
    fontFamily: humanist-sans
    fontSize: 94px
    lineHeight: 1.0
    fontWeight: 700
    letterSpacing: "-3px"
  heading:
    fontFamily: humanist-sans
    fontSize: 40px
    lineHeight: 1.2
    fontWeight: 700
    letterSpacing: "-1px"
  body:
    fontFamily: humanist-sans
    fontSize: 16px
    lineHeight: 1.5
    fontWeight: 400
    letterSpacing: "0px"
  small:
    fontFamily: humanist-sans
    fontSize: 13px
    lineHeight: 1.5
    fontWeight: 500
    letterSpacing: "0px"

rounded:
  sm: 4px
  md: 8px
  lg: 16px
  pill: 999px

spacing:
  xs: 4px
  sm: 8px
  md: 16px
  lg: 24px
  xl: 32px
  2xl: 48px
  3xl: 64px

---

## Overview

StackBlitz is a browser-based cloud IDE that brings lightning-fast, secure development environments to modern web teams.

*A high-performance engine for browser-based development.*

## Colors

High-contrast dark UI emphasizing speed and focus, with a single vibrant blue accent.

- **Background (`#0f1014`)** — uses `bg` token
- **Primary text (`#ffffff`)** — uses `ink` token
- **Secondary text (`rgba(255,255,255,0.8)`)** — uses `ink-soft` token
- **Accent (`#00a8db`)** — uses `accent` token
- **Muted (`#a1a5b0`)** — uses `muted` token
- **Borders (`rgba(255,255,255,0.12)`)** — uses `line` token

## Typography

- **Display:** humanist-sans
- **Body:** humanist-sans
- **Mono:** monospace

- Use Manrope for large display typography and Inter for body/UI text.
- Maintain tight letter-spacing for headings to create a dense, high-impact feel.
- Use Roboto Mono for any technical or code-related snippets.

## Layout

A standard high-end marketing site layout with full-width dark hero sections, centered content columns, and side-by-side comparison grids.

*Rhythm:* Generous spacing between major sections, with tight internal padding for UI components.

## Elevation & Depth

- rgba(0, 0, 0, 0.32) 0px 4px 8px 0px
- rgba(255, 255, 255, 0.1) 0px 0px 0px 1px
- rgba(0, 0, 0, 0.3) 0px 0px 0px 1px inset
- Borders: 1px solid rgba(255, 255, 255, 0.12)

## Shapes

- `sm`: 4px
- `md`: 8px
- `lg`: 16px
- `pill`: 999px

## Components

- **button:** Solid blue primary buttons with white text and a pill or large-radius shape; subtle hover states.
- **card:** Dark surfaces with subtle borders, often used for data or feature comparisons.
- **chip:** Used for status indicators or small tags within data tables.
- **input:** Minimal dark inputs with subtle inset shadows and thin borders.
- **hero:** Large-scale typography-heavy hero with a bold background gradient and faint, wireframe-like UI illustrations.

## Do's and Don'ts

**Don't:**
- Don't use a white background — screenshot shows a dark, near-black primary background.
- Don't use serif fonts — screenshot shows clean, modern sans-serif typography.
- Don't use multiple competing accent colors — screenshot shows a single dominant blue accent.
- Don't use large border-radius for primary buttons — screenshot shows rectangular or slightly rounded buttons.
- Don't use thin, light-colored outlines for focus states — screenshot uses high-contrast white or blue borders.
- Don't use overly complex gradients — screenshot uses subtle, dark-to-darker gradients or solid dark surfaces.

---

## System Prompt (paste into AI agent)

```
This is StackBlitz, a high-performance browser-based cloud IDE for developers. The design is a premium dark-mode aesthetic, positioning the product as fast, modern, and professional. Key colors are a very dark gray/black background (#0f1014, #151619), crisp white text (#ffffff, rgba(255,255,255,0.8)), and a vibrant, high-chroma blue accent (#00a8db). Typography uses humanist-sans categories (Inter, Manrope) with a very large, tight-tracked display scale. Critical donts: Never use a light theme; avoid thin, decorative fonts; and never use more than one vibrant accent color. The overall feel is calm, focused, and built for productivity.
```