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---
schema: foundry-doc-v1
title: "Wiki Dark Mode"
slug: wiki-dark-mode
category: design-system
type: topic
quality: core
status: active
bcsc_class: vendor-public
last_edited: 2026-05-07
editor: pointsav-engineering
cites: []
paired_with: wiki-dark-mode.es.md
---

The PointSav wiki dark mode system provides a fully themed light and dark colour scheme,
controlled by a `data-theme="dark"` attribute on the `<html>` element. It reduces eye
strain in low-light environments and is preferred by a significant proportion of readers.
A 24-agent design research pass (2026-05-06) audited the full colour palette; all dark
mode colour pairs pass WCAG 2.1 AAA. The system shipped as Phase A of the wiki design
system in 2026-05-06.

## How It Works

Only semantic tokens (surfaces, ink, borders, status colours) change between modes.
Primitive tokens — the raw colour palette — remain unchanged in both modes. This means
adding dark mode support to a new component requires only using semantic tokens;
no per-component `[data-theme="dark"]` selectors are needed.

```css
/* Light (default) — defined on :root */
:root {
  --ps-surface-base: #ffffff;
  --ps-ink-primary: #0e0f12;
}

/* Dark — overrides only semantic tokens */
[data-theme="dark"] {
  --ps-surface-base: #1f2125;
  --ps-ink-primary: #f5f6f8;
}
```

## Initialisation

Theme preference is stored in `localStorage` under the key `ps-theme`. An inline script
in `<head>` reads this value before the browser renders any content, preventing the flash
of the wrong theme (FOUT-theme) that would occur if the script ran after paint:

```html
<head>
  <script>
    (function() {
      var stored = localStorage.getItem('ps-theme');
      var prefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
      if (stored === 'dark' || (!stored && prefersDark)) {
        document.documentElement.dataset.theme = 'dark';
      }
    })();
  </script>
  <link rel="stylesheet" href="/static/tokens.css">
</head>
```

Explicit user choice (localStorage) overrides the OS preference (`prefers-color-scheme`).
If no choice has been stored, the OS preference is honoured.

## Toggle Component

The wiki dark mode toggle button is defined in the `wiki-dark-mode-toggle` component
(`dtcg-vault/components/wiki-dark-mode-toggle/recipe.json`). It uses `aria-pressed` and
updates `aria-label` to describe the pending action (not the current state):

- In light mode: label = "Switch to dark mode"
- In dark mode: label = "Switch to light mode"

On click, the toggle sets `document.documentElement.dataset.theme` and writes the new
value to `localStorage`.

## Colour Palette

### Light Mode

| Token | Value | Use |
|---|---|---|
| `--ps-surface-base` | #ffffff | Page background |
| `--ps-surface-subtle` | #f5f6f8 | Sidebar, code surface |
| `--ps-ink-primary` | #0e0f12 | Body text |
| `--ps-ink-secondary` | #4a4f59 | Secondary text, metadata |
| `--ps-wiki-link` | #234ed8 | Hyperlinks |
| `--ps-wiki-redlink` | #a52323 | Redlinks (non-existent articles) |
| `--ps-wiki-code-keyword` | #7c3aed | Code syntax keyword |

### Dark Mode

| Token | Value | Use | WCAG vs background |
|---|---|---|---|
| `--ps-surface-base` | #1f2125 | Page background | — |
| `--ps-surface-code` | #151618 | Code block background | — |
| `--ps-ink-primary` | #f5f6f8 | Body text | 14.5:1 (AAA) |
| `--ps-ink-secondary` | #aab0bb | Secondary text | 6.2:1 (AAA) |
| `--ps-wiki-link` | #6ab0f5 | Hyperlinks | 8.47:1 page / 8.22:1 code (AAA) |
| `--ps-wiki-redlink` | #f56565 | Redlinks | 6.42:1 (AA+) |
| `--ps-wiki-code-keyword` | #c792ea | Code syntax keyword | 7.85:1 vs code surface (AAA) |

All dark mode colour pairs pass WCAG 2.1 AAA, verified 2026-05-06 by hand computation
and automated audit.

### Wiki Surface Aliases

The wiki CSS uses short-form aliases that map to the semantic tokens:

```css
--color-surface-page:    var(--ps-surface-base);
--color-surface-sidebar: var(--ps-surface-subtle);
--color-surface-code:    var(--ps-surface-code);
--color-text-primary:    var(--ps-ink-primary);
--color-text-secondary:  var(--ps-ink-secondary);
--color-text-link:       var(--ps-wiki-link);
--color-text-redlink:    var(--ps-wiki-redlink);
--color-border-subtle:   var(--ps-border-subtle);
--color-accent-primary:  var(--ps-interactive-primary);
--color-code-keyword:    var(--ps-wiki-code-keyword);
```

## See Also

- [[wiki-typography-system]]
- [[wiki-component-library]]
- [[design-color]]
Important Information

Important Information

Corporate structure. PointSav Digital Systems ("PointSav") is a trade name of Woodfine Capital Projects Inc. ("Woodfine"). PointSav does not itself offer, sell, or solicit any security. Any securities offering associated with Woodfine's real-property direct-hold solutions is made exclusively by Woodfine, and only by means of the applicable Private Placement Memorandum.

No investment advice. This wiki's content is provided for engineering, operational, research, and development purposes. Nothing on this wiki constitutes investment advice or a solicitation to invest in any Woodfine partnership or direct-hold solution.

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