Theming

Default: Tokyo Night (Night variant)

Canonical palette. Source-of-truth lives in src-tauri/src/modules/theme/palette.rs (TBD in Phase 1). Everything else reads from there.

Token	Hex	Use
bg	#1a1b26	window/pane background
bg-alt	#16161e	sidebar, popover
fg	#a9b1d6	default text
fg-dim	#787c99	secondary text, comments
accent	#7aa2f7	primary accent (blue), cursor
cyan	#7dcfff	strings, links
green	#9ece6a	success, additions
red	#f7768e	error, deletions
yellow	#e0af68	warning
purple	#bb9af7	keywords, special
selection	#283457	selection background

ANSI palette must match Tokyo Night Night (see Ghostty's built-in theme).

Rules

1. No hardcoded colors in components. Always reference theme tokens via CSS custom properties (var(--nyx-accent)) or a typed theme object.
2. Theme is emitted, not computed. Rust emits the palette to the frontend on theme change; frontend listens and updates CSS vars.
3. Sister tools read from us. Theme API exports JSON/TOML fragments for fzf, bat, lazygit, btop, starship (or our prompt). User picks once, theme propagates everywhere.

Theme API shape (draft)

struct Theme {
    name: String,
    palette: Palette,
    ansi: [Color; 16],
}

#[tauri::command] fn theme_get() -> Theme
#[tauri::command] fn theme_set(name: String)
#[tauri::command] fn theme_export(target: ExportTarget) -> String

Targets: fzf, bat, lazygit, btop, delta, starship, kitty-conf (compat).

Frontend

:root {
  --nyx-bg: #1a1b26;
  --nyx-fg: #a9b1d6;
  --nyx-accent: #7aa2f7;
  /* ... */
}

CSS vars set on :root by a useTheme() hook listening to the Rust event. Components only use vars.

xterm.js terminal theme

term.options.theme = {
  background: cssVar('--nyx-bg'),
  foreground: cssVar('--nyx-fg'),
  cursor: cssVar('--nyx-accent'),
  selectionBackground: cssVar('--nyx-selection'),
  // ... 16 ANSI colors from theme.ansi
};

Re-apply on theme change.

Transparency / aesthetic

Default opacity: 0.95. Unfocused-split opacity: 0.9 (dim inactive panes, Ghostty pattern). CSS-driven, GPU-accelerated.

What we do NOT support (yet)

• Live theme reload from the OS (light/dark). Phase 2.
• User-authored themes. Phase 1.5+ via Settings UI.
• Per-pane themes. Probably never — clutter.