dsh-custom-fonts

Customize the Chinese and English fonts, the code font, and the global font size of the DeepSeek Harness Web UI — right from a settings page, with a live preview.

中文说明

What it does

A pure client-side plugin (no host half, no restart needed). Once installed it adds a Fonts (字体) page under Settings:

• UI font · English — used for Latin characters. (Segoe UI, Arial, Georgia, Consolas…)
• UI font · Chinese — used for Han characters. (微软雅黑 / 宋体 / 黑体 / 楷体 / 思源黑体 / 苹方…)
• Code font — a separate mono face for code blocks and inline code (pre/code/kbd/samp). (Consolas, JetBrains Mono, Fira Code, Cascadia Code, Sarasa Mono SC…)
• Font-size offset — a -4..+8 px global slider; kernel text stays sharp, no layout blow-up (see below).
• Live preview — mixed Chinese/English UI sample plus a code-font sample render as you type (comma-separated font lists and free-form names are both supported).
• Reset — clears every control and removes all injected styles.

How it works

The plugin injects one global stylesheet:

:root { --dsh-custom-fonts-en: 'English'; --dsh-custom-fonts-zh: 'Chinese'; }
body, body * { font-family: 'English font', 'Chinese font' !important; }
pre, code, kbd, samp { font-family: 'Code font' !important; }
body, body * { font-size: calc(1em + 2px) !important; }  /* when offset ≠ 0 */

• The font-family fallback chain is the standard way to split fonts by script: Latin characters match the English font first, and Han characters — which the English font has no glyphs for — fall back to the Chinese font. No language detection, no DOM surgery.
• The code-font rule comes later and wins inside code regions only.
• The size offset applies calc(1em ± Npx) relative to each element's own size, so every nesting level shifts by exactly N — no exponential cascade. Clearing it (0) restores the default.

Changes apply immediately and globally (message body, sidebar, inputs, everything).

Install

From the plugin market (Settings → Plugin Market) once the entry is published, or:

dsh plugin --profile web add dsh-custom-fonts

or directly from the repository:

dsh plugin --profile web add github:lsh2002/dsh-custom-fonts

Client-only plugin: after a page refresh it is live — no restart required.

Uninstall

Remove it from Settings → Plugins → Plugin configuration (or dsh plugin --profile web remove dsh-custom-fonts), refresh the page; your fonts are reverted automatically.

License

MIT