Aptlantis QBasic is a dark SiYuan theme derived from the Aptlantis QBasic palette, combining deep midnight-blue structural tones with electric blue, cyan, and magenta accents.
The workspace uses deep navy and obsidian surfaces (#091222, #060C1B, #010102) for a calm, high-contrast reading canvas. Accents are mapped to distinct interface roles: bright and cobalt blues for primary focus, navigation, and scrollbars; vibrant magenta for secondary interactions, keywords, and callouts; warm cream for links and titles; and icy cyan for strings and inline highlights. Panels, toolbars, breadcrumbs, tables, menus, and the editor retain clear structural hierarchy across light and dark display contexts.
- Color specification:
palette.toml(processed viasiyuan-theme-builder) - Color spaces: OKLCH perceptual color definitions with sRGB hex fallbacks for broad compatibility.
The syntax palette translates the palette hues directly into SiYuan's native Highlight.js roles instead of introducing a competing JavaScript highlighter.
theme.json: SiYuan package metadatatheme.css: reference colors, semantic roles, SiYuan variables, and component stylingicon.png: marketplace iconpreview.png: marketplace previewREADME.md: theme documentationLicense: licensing terms
- App background / chassis:
#091222 - Editor surface:
#060C1B - Panels, menus & dialogs:
#010102 - Raised surface:
#001766 - Structural border:
#706B71/#33528C - Primary blue:
#0672CC - Secondary / error magenta:
#CD5DE6 - Warning / bright blue:
#0A92EE - Scrollbar / data cyan:
#4FADF8 - Link / function cream:
#F7EBD1 - String icy cyan:
#C7F8FC - Reading text:
#FDFDFC - Soft text:
#B3ACAF - Muted text:
#8F8B91
Deep navy and dark neutrals carry structure; saturated blues and crisp magenta accents communicate state, interactive cues, and editorial meaning. Aptlantis QBasic is intentionally a single dark theme.
The theme follows the SiYuan 3.7+ / 3.8+ theme-variable and selector contract and uses only theme.css; the deprecated theme.js entry point is not included. Restart SiYuan after replacing an installed copy because the kernel may cache theme assets.