---
version: alpha
name: StackBlitz
description: Dark design system extracted from stackblitz.com (DOM-true values, Emblematic extractor 0.2.0, 2026-11-12).
colors:
  background: "#1C1F25"
  on-surface: "#FFFFFF"
  on-surface-variant: "#FFFFFFCC"
  surface: "#151619F5"
  primary: "#1574EF"
  outline: "#FFFFFF1F"
  public-bg-dark-accent: "#00000052"
  public-pink-bg-dark: "#470F4A4D"
  public-blue-bg-dark: "#084D6633"
  color-10: "#0F1115"
  public-light-text-00: "#000000"
  public-blue-text-10: "#69F5FF"
  color-13: "#A1A5B0"
  public-blue-text-50: "#00A8DB"
  color-15: "#313D5E3D"
  on-primary: "#FFFFFF"
typography:
  display-lg:
    fontFamily: Manrope
    fontSize: 94px
    fontWeight: 600
    lineHeight: 1
    letterSpacing: -0.021em
  title-md:
    fontFamily: Manrope
    fontSize: 40px
    fontWeight: 400
    lineHeight: 1.2
    letterSpacing: -0.012em
  body-md:
    fontFamily: Inter
    fontSize: 16px
    fontWeight: 400
    lineHeight: 2
  body-sm:
    fontFamily: Inter
    fontSize: 13px
    fontWeight: 600
    lineHeight: 1.8
  label-md:
    fontFamily: Inter
    fontSize: 13px
    fontWeight: 500
    lineHeight: 1.385
  mono-md:
    fontFamily: PT Mono
    fontSize: 94px
    fontWeight: 400
    lineHeight: 1
    letterSpacing: -0.043em
rounded:
  xs: 6px
  sm: 8px
  md: 10px
  lg: 16px
  xl: 20px
  full: 9999px
spacing:
  xxs: 2px
  xs: 8px
  sm: 16px
  md: 18px
  lg: 20px
  xl: 24px
  2xl: 26px
  3xl: 28px
  4xl: 32px
  5xl: 36px
  6xl: 52px
  7xl: 64px
  8xl: 72px
  9xl: 80px
  base: 4px
  container: 1336px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.on-surface}"
    rounded: "{rounded.md}"
    padding: 0px
    height: 52px
    typography: "{typography.label-md}"
  button-secondary:
    backgroundColor: "{colors.on-surface}"
    textColor: "{colors.on-surface}"
    rounded: 0px
    padding: 6px
    height: 44px
    typography: "{typography.label-md}"
---

# StackBlitz

> Extracted from [https://stackblitz.com/](https://stackblitz.com/) on 2026-11-12 by Emblematic. Every value below was read from the rendered DOM (computed styles, `document.fonts`, and the fonts Chrome actually used to paint text), not estimated from pixels. When the YAML front matter and this prose disagree, the YAML wins. Copy values from this file exactly; don't transcribe them from memory. Don't copy logos, imagery, illustrations or marketing copy.

## Overview

StackBlitz uses a dark canvas (#1C1F25) with a palette led by #1574EF. Type is set in **Manrope** (display), **Inter**, **PT Mono** (mono), with 16px body text. Layout: 1336px container, top-sticky+transparent navigation, 4 sections. Built with astro, google-tag-manager, cloudflare, cloudfront.

## Colors

Area-weighted from painted backgrounds, text and borders on the 1440px light capture. Roles are inferred from usage (largest background, most text, interactive fills). Every hex is an exact computed value; a role marked *unverified* is a best guess that has not passed review, so its canonical token (e.g. `primary`) is left out of the front matter.

| Token | Hex | OKLCH | Role | Share of paint | CSS variable |
|---|---|---|---|---|---|
| `background` | `#1C1F25` | 0.239 0.012 264.3 | bg | 69.3% | `--public-bg-90` |
| `on-surface` | `#FFFFFF` | 1 0 0 | text | 14.1% | `--public-text-00` |
| `on-surface-variant` | `#FFFFFFCC` (on bg `#D2D2D3`) | 1 0 0 | muted | 1.2% | `--text-color` |
| `surface` | `#151619F5` (on bg `#151619`) | 0.2 0.006 271.1 | surface | 0.98% | `--public-bg-90-transparent` |
| `primary` | `#1574EF` | 0.58 0.203 258 | accent | 0.10% | — |
| `outline` | `#FFFFFF1F` (on bg `#373A3F`) | 1 0 0 | border | 0.16% | — |
| `public-bg-dark-accent` | `#00000052` (on bg `#131519`) | 0 0 0 | other | 5.1% | `--public-bg-dark-accent` |
| `public-pink-bg-dark` | `#470F4A4D` (on bg `#291A30`) | 0.294 0.114 325.8 | other | 2.4% | `--public-pink-bg-dark` |
| `public-blue-bg-dark` | `#084D6633` (on bg `#182832`) | 0.394 0.075 229.5 | other | 2.4% | `--public-blue-bg-dark` |
| `color-10` | `#0F1115` | 0.177 0.009 264.3 | other | 1.4% | — |
| `public-light-text-00` | `#000000` | 0 0 0 | other | 0.86% | `--public-light-text-00` |
| `public-blue-text-10` | `#69F5FF` | 0.897 0.121 201.7 | other | 0.75% | `--public-blue-text-10` |
| `color-13` | `#A1A5B0` | 0.722 0.017 269.9 | other | 0.26% | — |
| `public-blue-text-50` | `#00A8DB` | 0.684 0.135 228.8 | other | 0.24% | `--public-blue-text-50` |
| `color-15` | `#313D5E3D` (on bg `#212633`) | 0.365 0.059 268.2 | other | 0.04% | — |

Sparse chromatic highlights (not accents): `#33FFCC` (`--brand-teal-300`), `#69F5FF` (`--public-blue-text-10`).

Contrast: text on background 16.29:1, muted text 10.94:1, accent 3.75:1.

Gradients in use: `linear-gradient(rgba(0, 0, 0, 0.32), rgba(0, 0, 0, 0) 80%)`; `linear-gradient(to right, rgba(71, 15, 74, 0.3) 20%, rgba(8, 77, 102, 0.2) 80%)`.

The site does not change under `prefers-color-scheme: dark`.

## Typography

| Family | Role | Weights | Share of text | Source |
|---|---|---|---|---|
| **Manrope** | display | 400, 600, 700, 800 | 57.1% | webfont |
| **Inter** | body | 400, 500, 600, 700 | 30.4% | webfont |
| **PT Mono** | mono | 400, 600 | 12.5% | system (stack `"PT Mono", monospace`, resolved on macos) |

Declared in `@font-face` but not used to paint text on this page: Roboto Mono, Inter Tight,sans Serif. Don't treat these as the page's fonts.

Scale (px): 9, 11, 13, 14, 15, 16, 18, 24, 30, 32, 40, 72, 94. Effective ratio ≈ 1.288 (close to a major third). Body 16px at line-height 2; display 94px with tracking -0.021em. Headings are sentence case. On a 390px viewport the body is 17px and display 34px.

## Layout

Spacing follows a 4px base unit; the most used steps are 2, 8, 16, 18, 20, 24, 26, 28, 32, 36, 52, 64, 72, 80px. Sections open with about 80px of space before their first line of text. Content sits in a 1336px container on a 4-column grid. Text density 0.12 (text area / page area).

Section order (desktop). Kinds below the review threshold are shown as *section*:

1. **nav** (72px, bg #1C1F25)
2. **hero** — “How & work together with AI” (1780px, bg #1C1F25)
3. **section** — “and than local.” (1921px, bg #1C1F25)
4. **footer** (641px, bg #1C1F25)

## Elevation & Depth

Style: subtle. Most used shadows:

- `rgb(16, 23, 30) 0px -1px 0px 0px inset, rgba(0, 0, 0, 0.32) 0px 4px 8px 0px`
- `rgba(255, 255, 255, 0.1) 0px 1px 0px 0px`
- `rgba(255, 255, 255, 0.1) 0px -1px 0px 0px`

## Shapes

Dominant corner radius 0px; radii in use: 6px, 8px, 10px, 16px, 20px, pill. Borders: hairline (1px).

## Components

- **button-primary**: backgroundColor `#1574EF`, textColor `#FFFFFF`, rounded `10px`, padding `0px 32px`, height `52px`, fontFamily `Inter`, fontSize `16px`, fontWeight `500`, shadow `rgba(255, 255, 255, 0.14) 0px 0px 0px 1px inset` (e.g. “Try Bolt.new”)
- **button-secondary**: backgroundColor `#FFFFFF`, textColor `#FFFFFF`, rounded `0px`, padding `6px 8px`, height `44px`, fontFamily `Inter`, fontSize `16px`, fontWeight `400`

## Do's and Don'ts

- Do reserve `#1574EF` for primary actions and highlights; it covers only 0.10% of the painted page.
- Do set body copy in Inter at 16px / 2.
- Do use Manrope only for display sizes, not for body text.
- Do tighten large headlines (-0.021em at 94px).
- Don't introduce font weights beyond 400, 500, 600, 700, 800.
- Do keep corners at 0px for most controls, and use the larger radii only for cards and media.
- Do snap spacing to multiples of 4px.
- Don't copy this site's logos, illustrations, photography or copy; use the system, not the brand assets.

## Provenance

Spec v2, extractor 0.2.0. Render quality: **ok**. Vision pass: not run. Fields below confidence 0.7 are hedged or left out above: `color.accent_strategy`, `layout.columns`, `layout.hero`, `layout.section_count`, `space.section_padding_px`. Full per-field provenance is in `spec.json`.