CSS Variables¶

Every visual surface in Lumina is driven by a CSS custom property. Override any of these in your own stylesheet to retheme the docs without forking the theme. For step-by-step instructions on adding a custom stylesheet, see Custom Styling.

3 min read

All tokens are defined for both the default light scope (:root / [data-theme="light"]) and dark mode ([data-theme="dark"]).

Theme tokens¶

The core surface and text tokens. These are the variables you’ll override most often.

Token	Light default	Dark default	What it affects
`--lumina-bg`	`#fdfdfc`	`#151918`	Page background
`--lumina-bg-secondary`	`#f4f5f4`	`#202623`	Hover surfaces and table-header tint
`--lumina-text`	`#202624`	`#e9eeeb`	Body and heading color
`--lumina-text-muted`	`#59635e`	`#a8b5ac`	Secondary text (TOC links, captions, footer)
`--lumina-border`	`#dfe5e1`	`#303b34`	Dividers, table cell borders, sidebar separators
`--lumina-accent`	`#10b981`	`#10b981`	Brand accents, active indicators, skip link, headerlink tooltip. Also overridable through the `accent_color` theme option.
`--lumina-link`	`#08764f`	`#5ed9a3`	Readable text links and focus outlines
`--lumina-navigation-bg`	`#f9fbfa`	`#171c19`	Desktop sidebar surface and the outer gutter to its left
`--lumina-floating-bg`	`#fdfdfc`	`#242c27`	Section switcher, page-actions menu, search dialog, and back-to-top button
`--lumina-accent-light`	`#eaf6ef`	`#1c3329`	Hover/active background tint for accent surfaces, including the current sidebar item
`--lumina-code-bg`	`#f6f7f6`	`#1b211e`	Inline code and code block background
`--lumina-font-sans`	Source Sans 3 stack	Same as light	Body text, UI labels, API documentation, and diagrams. See Custom Styling.
`--lumina-font-mono`	JetBrains Mono stack	Same as light	Code blocks, inline code, and API signatures. See Custom Styling.

Tip

Set the accent through the theme option rather than overriding the variable directly — accent_color also derives --lumina-link and --lumina-accent-light using color-mix(). When overriding tokens directly, set them separately for light and dark mode and check contrast against your backgrounds.

Admonition tokens¶

One color per admonition type, plus a darker variant for the warning text where the regular hue would clip on light backgrounds.

Token	Light default	Dark default	Used by
`--lumina-adm-note`	`#2563eb`	`#60a5fa`	`note`
`--lumina-adm-tip`	`#08764f`	`#34d399`	`tip`, `hint`
`--lumina-adm-warning`	`#f59e0b`	`#fbbf24`	`warning`, `caution`, `attention`
`--lumina-adm-warning-text`	`#b45309`	`#f59e0b`	Warning title text (darker for AA contrast on light background)
`--lumina-adm-danger`	`#dc2626`	`#f87171`	`danger`, `error`
`--lumina-adm-important`	`#7c3aed`	`#a78bfa`	`important`
`--lumina-adm-seealso`	`#0e7490`	`#22d3ee`	`seealso`

The thin border, icon mask, and 4–5% background tint of every admonition derive from these colors via color-mix() — overriding the token recolors the whole admonition.

sphinx-design tokens¶

Lumina also overrides sphinx-design’s color tokens (--sd-color-primary, --sd-color-info, etc.) so cards, buttons, and badges from sphinx_design blend with the rest of the theme. These are documented in the sphinx-design reference; Lumina’s defaults map them onto its own palette.

If you want sphinx-design components to follow your accent color, override them alongside the Lumina tokens:

:root,
html:root {
  --lumina-accent: #6366f1;
  --lumina-link: #4f46e5;
  --sd-color-primary: #6366f1;
  --sd-color-primary-highlight: #4f46e5;
}

Override patterns¶

Switch the entire palette¶

:root {
  --lumina-bg: #fffaf2;
  --lumina-bg-secondary: #faf3e7;
  --lumina-text: #1c1917;
  --lumina-text-muted: #57534e;
  --lumina-border: #e7e5e4;
  --lumina-accent: #ea580c;
  --lumina-link: #c2410c;
  --lumina-navigation-bg: #faf3e7;
  --lumina-floating-bg: #fffaf2;
  --lumina-accent-light: #fff7ed;
  --lumina-code-bg: #faf3e7;
}

Recolor a single admonition type¶

:root {
  --lumina-adm-note: #6366f1; /* Indigo notes everywhere */
}

[data-theme="dark"] {
  --lumina-adm-note: #818cf8;
}

Match a brand color in dark mode only¶

[data-theme="dark"] {
  --lumina-accent: #f472b6;
  --lumina-link: #f9a8d4;
  --lumina-accent-light: #500724;
}

Where each token is wired up¶

Every token is consumed in src/sphinx_lumina_theme/_static_src/css/. If you’re customizing deeply and want to know exactly where a token is read, the easiest reference is the source — base.css declares the tokens; the per-feature stylesheets (typography.css, code.css, admonitions.css, api.css, landing.css, mermaid.css) consume them via var(--…).

For non-color customization (fonts, page elements, syntax highlighting), see Custom Styling.