---
version: alpha
name: Aeon
description: Light design system extracted from aeon.co (DOM-true values, Emblematic extractor 0.2.0, 2026-11-12).
colors:
  background: "#FFFFFF"
  on-surface: "#000000"
  surface: "#FEFBEC"
  on-surface-variant: "#000000A6"
  aeon-red: "#9D1D20"
  grey-light-bg: "#ECECEC"
typography:
  display-lg:
    fontFamily: Serif Font
    fontSize: 72px
    fontWeight: 600
    lineHeight: 1
  headline-md:
    fontFamily: Sans Font
    fontSize: 20px
    fontWeight: 400
    lineHeight: 1.4
  body-md:
    fontFamily: Sans Font
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.5
  body-sm:
    fontFamily: Sans Font
    fontSize: 14px
    fontWeight: 400
    lineHeight: 1.375
  mono-md:
    fontFamily: Mono Font
    fontSize: 13.5px
    fontWeight: 400
    lineHeight: 1.4
rounded:
  md: 4px
  full: 9999px
spacing:
  xxs: 2px
  xs: 4px
  sm: 8px
  md: 12px
  lg: 14px
  xl: 16px
  2xl: 18px
  3xl: 20px
  4xl: 24px
  5xl: 36px
  6xl: 176.5px
  7xl: 242px
  container: 1368px
components:
  input:
    backgroundColor: "{colors.background}"
    rounded: "{rounded.md}"
    padding: 12px
    height: 50px
---

# Aeon

> Extracted from [https://aeon.co/](https://aeon.co/) 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

Aeon uses a light canvas (#FFFFFF) with a palette. Type is set in **Serif Font** (display), **Sans Font**, **Mono Font** (mono), with 16px body text. Layout: 1368px container, top-static+transparent navigation, 4 sections. Built with next.js, tailwind, google-tag-manager, vercel.

## 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` | `#FFFFFF` | 1 0 0 | bg | 83.4% | `--color-white` |
| `on-surface` | `#000000` | 0 0 0 | text | 10.6% | `--color-black` |
| `surface` | `#FEFBEC` | 0.986 0.02 97.5 | surface | 5.1% | — |
| `on-surface-variant` | `#000000A6` (on bg `#595959`) | 0 0 0 | muted | 0.63% | — |
| `aeon-red` | `#9D1D20` | 0.453 0.163 25.8 | other | 0.10% | `--color-aeon-red` |
| `grey-light-bg` | `#ECECEC` | 0.943 0 0 | other | 0.04% | `--color-grey-light-bg` |

Sparse chromatic highlights (not accents): `#9D1D20` (`--color-aeon-red`), `#F74D41`.

Declared brand/accent tokens: `--color-brand-red` = `#9D1D20`, `--color-donate-primary` = `#D62168` (declared, not painted on this page).

Contrast: text on background 21:1, muted text 6.98:1.

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

## Typography

| Family | Role | Weights | Share of text | Source |
|---|---|---|---|---|
| **Serif Font** (CSS: `serifFont`) | display | 600, 700 | 50.8% | webfont |
| **Sans Font** (CSS: `sansFont`) | body | 400, 700 | 39.3% | webfont |
| **Mono Font** (CSS: `monoFont`) | mono | 400 | 9.9% | webfont |

Scale (px): 12, 13.5, 14, 16, 18, 20, 22, 28, 72. Effective ratio ≈ 1.351 (close to a perfect fourth). Body 16px at line-height 1.5; display 72px with tracking 0em. Headings are sentence case. On a 390px viewport the body is 16px and display 25px.

## Layout

Spacing has no reliable single base unit; the most used steps are 2, 4, 8, 12, 14, 16, 18, 20, 24, 36, 176.5, 242px. Sections open with about 212px of space before their first line of text. Content sits in a 1368px container on a 3-column grid. Text density 0.095 (text area / page area).

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

1. **nav** (126px, bg #FFFFFF)
2. **hero** — “Why anything exists” (635px, bg #FFFFFF)
3. **section** — “Popular this month” (4655px, bg #FFFFFF)
4. **footer** (564px, bg #FFFFFF)

## Shapes

Dominant corner radius 0px; radii in use: 4px, pill. Borders: hairline (1px).

## Components

- **input**: rounded `4px`, height `50px`, padding `12px 14px`, backgroundColor `#FFFFFF`, border `1px solid #CCCCCC`

## Do's and Don'ts

- Do set body copy in Sans Font at 16px / 1.5.
- Do use Serif Font only for display sizes, not for body text.
- Don't introduce font weights beyond 400, 600, 700.
- Don't add drop shadows; depth comes from tone and borders.
- Do keep corners at 0px for most controls.
- 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`, `components`, `layout.columns`, `layout.hero`, `layout.section_count`, `space.base`, `space.section_padding_px`. Full per-field provenance is in `spec.json`.