---
version: alpha
name: Proton
description: Light design system extracted from proton.me (DOM-true values, Emblematic extractor 0.2.0, 2026-11-12).
colors:
  background: "#FFFFFF"
  on-surface: "#4B5563"
  surface: "#F6F7F9"
  primary: "#6D4AFF"
  outline: "#9CA3AF4D"
  color-6: "#372580"
  color-7: "#C5B7FF"
  color-8: "#9CA3AF1A"
  color-9: "#E2DBFF"
  on-primary: "#FFFFFF"
typography:
  display-lg:
    fontFamily: Proton Serif
    fontSize: 60px
    fontWeight: 400
    lineHeight: 1.06
    letterSpacing: -0.04em
  headline-md:
    fontFamily: Proton Serif
    fontSize: 36px
    fontWeight: 400
    lineHeight: 1.16
    letterSpacing: -0.04em
  title-md:
    fontFamily: Proton Sans
    fontSize: 16px
    fontWeight: 600
    lineHeight: 1.625
  body-md:
    fontFamily: Proton Sans
    fontSize: 16px
    fontWeight: 400
    lineHeight: 1.625
  body-sm:
    fontFamily: Proton Sans
    fontSize: 12px
    fontWeight: 400
    lineHeight: 1.5
rounded:
  sm: 4px
  md: 6px
  full: 9999px
spacing:
  xxs: 4px
  xs: 6px
  sm: 8px
  md: 12px
  lg: 16px
  xl: 20px
  2xl: 24px
  3xl: 32px
  4xl: 48px
  5xl: 64px
  6xl: 96px
  base: 4px
  container: 1280px
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.background}"
    rounded: "{rounded.full}"
    padding: 6px
    height: 38px
  button-secondary:
    backgroundColor: "#FDBA74"
    textColor: "#08031F"
    rounded: "{rounded.full}"
    padding: 4px
    height: 30px
  card:
    rounded: "{rounded.sm}"
    padding: 0px
---

# Proton

> Extracted from [https://proton.me/](https://proton.me/) 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

Proton uses a light canvas (#FFFFFF) with a palette led by #6D4AFF. Type is set in **Proton Sans**, **Proton Serif** (display), with 16px body text. Layout: 1280px container, none-detected navigation, 12 sections. Built with astro, tailwind, shadcn/ui.

## 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 | 82.3% | `--tw-ring-offset-color` |
| `on-surface` | `#4B5563` | 0.446 0.026 256.8 | text | 5.1% | — |
| `surface` | `#F6F7F9` | 0.976 0.003 264.5 | surface | 3.7% | — |
| `primary` | `#6D4AFF` | 0.562 0.251 283.7 | accent | 1.5% | — |
| `outline` | `#9CA3AF4D` (on bg `#E1E3E7`) | 0.714 0.019 261.3 | border | 0.02% | — |
| `color-6` | `#372580` | 0.348 0.145 285.1 | other | 6.2% | — |
| `color-7` | `#C5B7FF` | 0.817 0.101 292.9 | other | 0.57% | — |
| `color-8` | `#9CA3AF1A` (on bg `#F5F6F7`) | 0.714 0.019 261.3 | other | 0.31% | — |
| `color-9` | `#E2DBFF` | 0.908 0.049 294.3 | other | 0.28% | — |

Sparse chromatic highlights (not accents): `#FDBA74`.

Contrast: text on background 7.56:1, accent 5.15:1.

Gradients in use: `linear-gradient(to right top, rgb(197, 183, 255), rgb(246, 247, 249) 40%)`; `linear-gradient(to right top, rgb(246, 247, 249) 40%, rgb(226, 219, 255) 100%)`.

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

## Typography

| Family | Role | Weights | Share of text | Source |
|---|---|---|---|---|
| **Proton Sans** (CSS: `ProtonSans`) | body | 400, 600 | 59.5% | webfont |
| **Proton Serif** (CSS: `ProtonSerif`) | display | 400 | 40.5% | webfont |

Scale (px): 12, 14, 16, 18, 20, 30, 36, 48, 60. Effective ratio ≈ 1.246 (close to a major third). Body 16px at line-height 1.625; display 60px with tracking -0.04em. Headings are sentence case. On a 390px viewport the body is 16px and display 36px.

## Layout

Spacing follows a 4px base unit; the most used steps are 4, 6, 8, 12, 16, 20, 24, 32, 48, 64, 96px. Sections open with about 148px of space before their first line of text. Content sits in a 1280px container on a 2-column grid. Text density 0.105 (text area / page area).

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

1. **hero** — “A better internet starts with privacy and freedom” (886px, bg #FFFFFF)
2. **section** — “Communicate and browse. Privately.” (632px, bg #FFFFFF)
3. **section** — “Store, share, collaborate. Securely.” (912px, bg #FFFFFF)
4. **section** — “Defend your digital life from hackers. Effortlessly.” (776px, bg #FFFFFF)
5. **section** — “Host and join confidential meetings” (755px, bg #FFFFFF)
6. **section** — “Powerful AI that respects your privacy.” (668px, bg #FFFFFF)
7. **section** — “Protect your business with easy-to-use encrypted solutions.” (640px, bg #FFFFFF)
8. **section** — “With Proton, your data belongs to you, not tech companies, governments, or hacke” (1673px, bg #FFFFFF)
9. **section** — “Over 100 million people and businesses have signed up for Proton” (1278px, bg #FFFFFF)
10. **section** — “Built by the community, for the community” (727px, bg #FFFFFF)
11. **testimonials** — “Choose an internet where your privacy comes first” (822px, bg #FFFFFF)
12. **footer** (614px, bg #FFFFFF)

## Shapes

Dominant corner radius is a full pill; radii in use: 4px, 6px, pill. Borders: hairline (1px).

## Components

- **button-primary**: backgroundColor `#6D4AFF`, textColor `#FFFFFF`, rounded `9999px`, padding `6px 20px`, height `38px`, fontFamily `Proton Sans`, fontSize `16px`, fontWeight `600` (e.g. “Get it for free”)
- **button-secondary**: backgroundColor `#FDBA74`, textColor `#08031F`, rounded `9999px`, padding `4px 12px`, height `30px`, fontFamily `Proton Sans`, fontSize `14px`, fontWeight `600` (e.g. “Get the deal”)
- **card**: rounded `4px`, padding `0px`, shadow `rgb(255, 255, 255) 0px 0px 0px 0px inset, rgba(0, 0, 0, 0) 0px 0px 0px 2px inset, rgba(0, 0, 0, 0) 0px 0px 0px 0px`

## Do's and Don'ts

- Do reserve `#6D4AFF` for primary actions and highlights; it covers only 1.5% of the painted page.
- Do set body copy in Proton Sans at 16px / 1.625.
- Do use Proton Serif only for display sizes, not for body text.
- Do tighten large headlines (-0.04em at 60px).
- Don't introduce font weights beyond 400, 600.
- Don't add drop shadows; depth comes from tone and borders.
- Do keep corners at pill 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`, `sections[].kind`, `space.section_padding_px`. Full per-field provenance is in `spec.json`.