theme redux

2026-02-05 01:07:22 -05:00
parent 6950deaa88
commit ea9ab4d3f9
25 changed files with 1339 additions and 131 deletions
--- a/src/components/Layout.tsx
+++ b/src/components/Layout.tsx
@@ -1,5 +1,7 @@
 import type { JSX } from "solid-js"
-import type { ThemeColors, LayerBackgrounds } from "../types/settings"
+import type { ThemeColors } from "../types/settings"
+import type { ColorValue } from "../types/theme-schema"
+import { resolveColorReference } from "../utils/theme-css"
 import { LayerIndicator } from "./LayerIndicator"

 type LayerConfig = {
@@ -17,6 +19,7 @@ type LayoutProps = {

 export function Layout(props: LayoutProps) {
  const theme = props.theme
+  const toColor = (value?: ColorValue) => (value ? resolveColorReference(value) : undefined)

  // Get layer configuration based on depth
  const getLayerConfig = (depth: number): LayerConfig => {
@@ -26,10 +29,10 @@ export function Layout(props: LayoutProps) {

    const backgrounds = theme.layerBackgrounds
    const depthMap: Record<number, LayerConfig> = {
-      0: { depth: 0, background: backgrounds.layer0 },
-      1: { depth: 1, background: backgrounds.layer1 },
-      2: { depth: 2, background: backgrounds.layer2 },
-      3: { depth: 3, background: backgrounds.layer3 },
+      0: { depth: 0, background: resolveColorReference(backgrounds.layer0) },
+      1: { depth: 1, background: resolveColorReference(backgrounds.layer1) },
+      2: { depth: 2, background: resolveColorReference(backgrounds.layer2) },
+      3: { depth: 3, background: resolveColorReference(backgrounds.layer3) },
    }

    return depthMap[depth] || { depth: 0, background: "transparent" }
@@ -43,14 +46,14 @@ export function Layout(props: LayoutProps) {
      flexDirection="column"
      width="100%"
      height="100%"
-      backgroundColor={theme?.background}
+      backgroundColor={toColor(theme?.background)}
    >
      {/* Header */}
      {props.header ? (
        <box
          style={{
            height: 4,
-            backgroundColor: theme?.surface,
+            backgroundColor: toColor(theme?.surface),
          }}
        >
          <box style={{ padding: 1 }}>
@@ -80,7 +83,7 @@ export function Layout(props: LayoutProps) {
        <box
          style={{
            height: 2,
-            backgroundColor: theme?.surface,
+            backgroundColor: toColor(theme?.surface),
          }}
        >
          <box style={{ padding: 1 }}>
@@ -96,7 +99,7 @@ export function Layout(props: LayoutProps) {
        <box
          style={{
            height: 1,
-            backgroundColor: theme?.surface,
+            backgroundColor: toColor(theme?.surface),
          }}
        >
          <box style={{ padding: 1 }}>
--- a/src/constants/themes.ts
+++ b/src/constants/themes.ts
@@ -1,16 +1,20 @@
-import type { ThemeColors, ThemeName } from "../types/settings"
-import { BASE_THEME_COLORS, BASE_LAYER_BACKGROUND, THEMES_DESKTOP } from "../types/desktop-theme"
+import type { ThemeColors, ThemeDefinition, ThemeName } from "../types/settings"
+import { BASE_THEME_COLORS, BASE_LAYER_BACKGROUND } from "../types/desktop-theme"
+import catppuccin from "../themes/catppuccin.json" with { type: "json" }
+import gruvbox from "../themes/gruvbox.json" with { type: "json" }
+import tokyo from "../themes/tokyo.json" with { type: "json" }
+import nord from "../themes/nord.json" with { type: "json" }
+import opencode from "../themes/opencode.json" with { type: "json" }

 export const DEFAULT_THEME: ThemeColors = {
  ...BASE_THEME_COLORS,
  layerBackgrounds: BASE_LAYER_BACKGROUND,
 }

-export const THEMES: Record<ThemeName, ThemeColors> = {
-  system: DEFAULT_THEME,
-  catppuccin: THEMES_DESKTOP.variants.find((v) => v.name === "catppuccin")!.colors,
-  gruvbox: THEMES_DESKTOP.variants.find((v) => v.name === "gruvbox")!.colors,
-  tokyo: THEMES_DESKTOP.variants.find((v) => v.name === "tokyo")!.colors,
-  nord: THEMES_DESKTOP.variants.find((v) => v.name === "nord")!.colors,
-  custom: DEFAULT_THEME,
+export const THEME_JSON: Record<string, ThemeDefinition> = {
+  opencode: opencode as ThemeDefinition,
+  catppuccin: catppuccin as ThemeDefinition,
+  gruvbox: gruvbox as ThemeDefinition,
+  tokyo: tokyo as ThemeDefinition,
+  nord: nord as ThemeDefinition,
 }
--- a/src/context/ThemeContext.test.ts
+++ b/src/context/ThemeContext.test.ts
@@ -0,0 +1,8 @@
+import { describe, expect, it } from "bun:test"
+import { ThemeProvider } from "./ThemeContext"
+
+describe("ThemeContext", () => {
+  it("exports provider", () => {
+    expect(typeof ThemeProvider).toBe("function")
+  })
+})
--- a/src/context/ThemeContext.tsx
+++ b/src/context/ThemeContext.tsx
@@ -1,67 +1,101 @@
-import { createContext, useContext, createSignal, createEffect, onCleanup } from "solid-js"
-import type { ThemeColors, ThemeName } from "../types/settings"
+import { createContext, createEffect, createMemo, createSignal, useContext } from "solid-js"
+import { createStore, produce } from "solid-js/store"
+import { useRenderer } from "@opentui/solid"
+import type { ThemeName } from "../types/settings"
+import type { ThemeJson } from "../types/theme-schema"
 import { useAppStore } from "../stores/app"
-import { applyTheme, setThemeAttribute, getSystemThemeMode } from "../utils/theme"
+import { THEME_JSON } from "../constants/themes"
+import { resolveTheme } from "../utils/theme-resolver"
+import { generateSyntax, generateSubtleSyntax } from "../utils/syntax-highlighter"
+import { generateSystemTheme } from "../utils/system-theme"
+import { getCustomThemes } from "../utils/custom-themes"
+import { setThemeAttribute } from "../utils/theme"
+import type { RGBA } from "@opentui/core"

-type ThemeContextType = {
-  themeName: () => ThemeName
-  setThemeName: (theme: ThemeName) => void
-  resolvedTheme: () => ThemeColors
-  isSystemTheme: () => boolean
-  currentMode: () => "dark" | "light"
+type ThemeContextValue = {
+  theme: Record<string, unknown>
+  selected: () => string
+  all: () => Record<string, ThemeJson>
+  syntax: () => unknown
+  subtleSyntax: () => unknown
+  mode: () => "dark" | "light"
+  setMode: (mode: "dark" | "light") => void
+  set: (theme: string) => void
+  ready: () => boolean
 }

-const ThemeContext = createContext<ThemeContextType>()
+const ThemeContext = createContext<ThemeContextValue>()

 export function ThemeProvider({ children }: { children: any }) {
  const appStore = useAppStore()
-  const [themeName, setThemeName] = createSignal<ThemeName>(appStore.state().settings.theme)
-  const [resolvedTheme, setResolvedTheme] = createSignal<ThemeColors>(appStore.resolveTheme())
-  const [currentMode, setCurrentMode] = createSignal<"dark" | "light">(getSystemThemeMode())
-
-  const isSystemTheme = () => themeName() === "system"
-
-  // Update theme when appStore theme changes
-  createEffect(() => {
-    const currentTheme = appStore.state().settings.theme
-    setThemeName(currentTheme)
-    setResolvedTheme(appStore.resolveTheme())
-
-    // Apply theme to CSS variables
-    if (currentTheme === "system") {
-      const mode = getSystemThemeMode()
-      setCurrentMode(mode)
-      applyTheme(resolvedTheme())
-    } else {
-      setCurrentMode("dark") // All themes are dark by default
-    }
-
-    setThemeAttribute(currentTheme === "system" ? "system" : currentTheme)
+  const renderer = useRenderer()
+  const [ready, setReady] = createSignal(false)
+  const [store, setStore] = createStore({
+    themes: { ...THEME_JSON } as Record<string, ThemeJson>,
+    mode: "dark" as "dark" | "light",
+    active: appStore.state().settings.theme as ThemeName,
  })

-  // Handle system theme changes
-  createEffect(() => {
-    if (isSystemTheme()) {
-      const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)")
-      const handler = () => {
-        const newMode = getSystemThemeMode()
-        setCurrentMode(newMode)
-        setResolvedTheme(appStore.resolveTheme())
-      }
-
-      mediaQuery.addEventListener("change", handler)
-
-      onCleanup(() => {
-        mediaQuery.removeEventListener("change", handler)
+  const init = () => {
+    getCustomThemes()
+      .then((custom) => {
+        setStore(
+          produce((draft) => {
+            Object.assign(draft.themes, custom)
          })
-    }
-  })
-
-  return (
-    <ThemeContext.Provider value={{ themeName, setThemeName, resolvedTheme, isSystemTheme, currentMode }}>
-      {children}
-    </ThemeContext.Provider>
        )
+      })
+      .finally(() => setReady(true))
+  }
+
+  init()
+
+  createEffect(() => {
+    setStore("active", appStore.state().settings.theme)
+    setThemeAttribute(appStore.state().settings.theme)
+  })
+
+  createEffect(() => {
+    if (store.active !== "system") return
+    renderer
+      .getPalette({ size: 16 })
+      .then((colors) => {
+        setStore(
+          produce((draft) => {
+            draft.themes.system = generateSystemTheme(colors, store.mode)
+          })
+        )
+      })
+      .catch(() => {})
+  })
+
+  const values = createMemo(() => {
+    const theme = store.themes[store.active] ?? store.themes.opencode
+    return resolveTheme(theme, store.mode)
+  })
+
+  const syntax = createMemo(() => generateSyntax(values() as unknown as Record<string, RGBA>))
+  const subtleSyntax = createMemo(() =>
+    generateSubtleSyntax(values() as unknown as Record<string, RGBA> & { thinkingOpacity?: number })
+  )
+
+  const context: ThemeContextValue = {
+    theme: new Proxy(values(), {
+      get(_target, prop) {
+        return values()[prop as keyof typeof values]
+      },
+    }),
+    selected: () => store.active,
+    all: () => store.themes,
+    syntax,
+    subtleSyntax,
+    mode: () => store.mode,
+    setMode: (mode) => setStore("mode", mode),
+    set: (theme) => appStore.setTheme(theme as ThemeName),
+    ready,
+  }
+
+  return <ThemeContext.Provider value={context}>{children}</ThemeContext.Provider>
 }

 export function useTheme() {
--- a/src/stores/app.ts
+++ b/src/stores/app.ts
@@ -1,6 +1,8 @@
 import { createSignal } from "solid-js"
-import { DEFAULT_THEME, THEMES } from "../constants/themes"
-import type { AppSettings, AppState, ThemeColors, ThemeName, UserPreferences } from "../types/settings"
+import { DEFAULT_THEME, THEME_JSON } from "../constants/themes"
+import type { AppSettings, AppState, ThemeColors, ThemeName, ThemeMode, UserPreferences } from "../types/settings"
+import { resolveTheme } from "../utils/theme-resolver"
+import type { ThemeJson } from "../types/theme-schema"

 const STORAGE_KEY = "podtui_app_state"

@@ -83,10 +85,13 @@ export function createAppStore() {
    updateSettings({ theme })
  }

-  const resolveTheme = (): ThemeColors => {
+  const resolveThemeColors = (): ThemeColors => {
    const theme = state().settings.theme
    if (theme === "custom") return state().customTheme
-    return THEMES[theme] ?? DEFAULT_THEME
+    if (theme === "system") return DEFAULT_THEME
+    const json = THEME_JSON[theme]
+    if (!json) return DEFAULT_THEME
+    return resolveTheme(json as ThemeJson, "dark" as ThemeMode) as unknown as ThemeColors
  }

  return {
@@ -95,7 +100,7 @@ export function createAppStore() {
    updatePreferences,
    updateCustomTheme,
    setTheme,
-    resolveTheme,
+    resolveTheme: resolveThemeColors,
  }
 }

--- a/src/themes/catppuccin.json
+++ b/src/themes/catppuccin.json
@@ -0,0 +1,74 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "defs": {
+    "background": "transparent",
+    "surface": "#1e1e2e",
+    "primary": "#89b4fa",
+    "secondary": "#cba6f7",
+    "accent": "#f9e2af",
+    "text": "#cdd6f4",
+    "muted": "#7f849c",
+    "warning": "#fab387",
+    "error": "#f38ba8",
+    "success": "#a6e3a1",
+    "layer0": "transparent",
+    "layer1": "#181825",
+    "layer2": "#11111b",
+    "layer3": "#0a0a0f"
+  },
+  "theme": {
+    "primary": "primary",
+    "secondary": "secondary",
+    "accent": "accent",
+    "error": "error",
+    "warning": "warning",
+    "success": "success",
+    "info": "secondary",
+    "text": "text",
+    "textMuted": "muted",
+    "selectedListItemText": "background",
+    "background": "background",
+    "backgroundPanel": "surface",
+    "backgroundElement": "layer1",
+    "backgroundMenu": "layer1",
+    "border": "muted",
+    "borderActive": "primary",
+    "borderSubtle": "muted",
+    "diffAdded": "success",
+    "diffRemoved": "error",
+    "diffContext": "muted",
+    "diffHunkHeader": "muted",
+    "diffHighlightAdded": "success",
+    "diffHighlightRemoved": "error",
+    "diffAddedBg": "layer2",
+    "diffRemovedBg": "layer3",
+    "diffContextBg": "layer1",
+    "diffLineNumber": "muted",
+    "diffAddedLineNumberBg": "layer2",
+    "diffRemovedLineNumberBg": "layer3",
+    "markdownText": "text",
+    "markdownHeading": "accent",
+    "markdownLink": "primary",
+    "markdownLinkText": "secondary",
+    "markdownCode": "success",
+    "markdownBlockQuote": "warning",
+    "markdownEmph": "warning",
+    "markdownStrong": "accent",
+    "markdownHorizontalRule": "muted",
+    "markdownListItem": "primary",
+    "markdownListEnumeration": "secondary",
+    "markdownImage": "primary",
+    "markdownImageText": "secondary",
+    "markdownCodeBlock": "text",
+    "syntaxComment": "muted",
+    "syntaxKeyword": "accent",
+    "syntaxFunction": "primary",
+    "syntaxVariable": "secondary",
+    "syntaxString": "success",
+    "syntaxNumber": "warning",
+    "syntaxType": "accent",
+    "syntaxOperator": "secondary",
+    "syntaxPunctuation": "text",
+    "thinkingOpacity": 0.6
+  }
+}
--- a/src/themes/gruvbox.json
+++ b/src/themes/gruvbox.json
@@ -0,0 +1,74 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "defs": {
+    "background": "transparent",
+    "surface": "#282828",
+    "primary": "#fabd2f",
+    "secondary": "#83a598",
+    "accent": "#fe8019",
+    "text": "#ebdbb2",
+    "muted": "#928374",
+    "warning": "#fabd2f",
+    "error": "#fb4934",
+    "success": "#b8bb26",
+    "layer0": "transparent",
+    "layer1": "#32302a",
+    "layer2": "#1d2021",
+    "layer3": "#0d0c0c"
+  },
+  "theme": {
+    "primary": "primary",
+    "secondary": "secondary",
+    "accent": "accent",
+    "error": "error",
+    "warning": "warning",
+    "success": "success",
+    "info": "secondary",
+    "text": "text",
+    "textMuted": "muted",
+    "selectedListItemText": "background",
+    "background": "background",
+    "backgroundPanel": "surface",
+    "backgroundElement": "layer1",
+    "backgroundMenu": "layer1",
+    "border": "muted",
+    "borderActive": "primary",
+    "borderSubtle": "muted",
+    "diffAdded": "success",
+    "diffRemoved": "error",
+    "diffContext": "muted",
+    "diffHunkHeader": "muted",
+    "diffHighlightAdded": "success",
+    "diffHighlightRemoved": "error",
+    "diffAddedBg": "layer2",
+    "diffRemovedBg": "layer3",
+    "diffContextBg": "layer1",
+    "diffLineNumber": "muted",
+    "diffAddedLineNumberBg": "layer2",
+    "diffRemovedLineNumberBg": "layer3",
+    "markdownText": "text",
+    "markdownHeading": "accent",
+    "markdownLink": "primary",
+    "markdownLinkText": "secondary",
+    "markdownCode": "success",
+    "markdownBlockQuote": "warning",
+    "markdownEmph": "warning",
+    "markdownStrong": "accent",
+    "markdownHorizontalRule": "muted",
+    "markdownListItem": "primary",
+    "markdownListEnumeration": "secondary",
+    "markdownImage": "primary",
+    "markdownImageText": "secondary",
+    "markdownCodeBlock": "text",
+    "syntaxComment": "muted",
+    "syntaxKeyword": "accent",
+    "syntaxFunction": "primary",
+    "syntaxVariable": "secondary",
+    "syntaxString": "success",
+    "syntaxNumber": "warning",
+    "syntaxType": "accent",
+    "syntaxOperator": "secondary",
+    "syntaxPunctuation": "text",
+    "thinkingOpacity": 0.6
+  }
+}
--- a/src/themes/nord.json
+++ b/src/themes/nord.json
@@ -0,0 +1,74 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "defs": {
+    "background": "transparent",
+    "surface": "#2e3440",
+    "primary": "#88c0d0",
+    "secondary": "#81a1c1",
+    "accent": "#ebcb8b",
+    "text": "#eceff4",
+    "muted": "#4c566a",
+    "warning": "#ebcb8b",
+    "error": "#bf616a",
+    "success": "#a3be8c",
+    "layer0": "transparent",
+    "layer1": "#3b4252",
+    "layer2": "#242933",
+    "layer3": "#1a1c23"
+  },
+  "theme": {
+    "primary": "primary",
+    "secondary": "secondary",
+    "accent": "accent",
+    "error": "error",
+    "warning": "warning",
+    "success": "success",
+    "info": "secondary",
+    "text": "text",
+    "textMuted": "muted",
+    "selectedListItemText": "background",
+    "background": "background",
+    "backgroundPanel": "surface",
+    "backgroundElement": "layer1",
+    "backgroundMenu": "layer1",
+    "border": "muted",
+    "borderActive": "primary",
+    "borderSubtle": "muted",
+    "diffAdded": "success",
+    "diffRemoved": "error",
+    "diffContext": "muted",
+    "diffHunkHeader": "muted",
+    "diffHighlightAdded": "success",
+    "diffHighlightRemoved": "error",
+    "diffAddedBg": "layer2",
+    "diffRemovedBg": "layer3",
+    "diffContextBg": "layer1",
+    "diffLineNumber": "muted",
+    "diffAddedLineNumberBg": "layer2",
+    "diffRemovedLineNumberBg": "layer3",
+    "markdownText": "text",
+    "markdownHeading": "accent",
+    "markdownLink": "primary",
+    "markdownLinkText": "secondary",
+    "markdownCode": "success",
+    "markdownBlockQuote": "warning",
+    "markdownEmph": "warning",
+    "markdownStrong": "accent",
+    "markdownHorizontalRule": "muted",
+    "markdownListItem": "primary",
+    "markdownListEnumeration": "secondary",
+    "markdownImage": "primary",
+    "markdownImageText": "secondary",
+    "markdownCodeBlock": "text",
+    "syntaxComment": "muted",
+    "syntaxKeyword": "accent",
+    "syntaxFunction": "primary",
+    "syntaxVariable": "secondary",
+    "syntaxString": "success",
+    "syntaxNumber": "warning",
+    "syntaxType": "accent",
+    "syntaxOperator": "secondary",
+    "syntaxPunctuation": "text",
+    "thinkingOpacity": 0.6
+  }
+}
--- a/src/themes/opencode.json
+++ b/src/themes/opencode.json
@@ -0,0 +1,245 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "defs": {
+    "darkStep1": "#0a0a0a",
+    "darkStep2": "#141414",
+    "darkStep3": "#1e1e1e",
+    "darkStep4": "#282828",
+    "darkStep5": "#323232",
+    "darkStep6": "#3c3c3c",
+    "darkStep7": "#484848",
+    "darkStep8": "#606060",
+    "darkStep9": "#fab283",
+    "darkStep10": "#ffc09f",
+    "darkStep11": "#808080",
+    "darkStep12": "#eeeeee",
+    "darkSecondary": "#5c9cf5",
+    "darkAccent": "#9d7cd8",
+    "darkRed": "#e06c75",
+    "darkOrange": "#f5a742",
+    "darkGreen": "#7fd88f",
+    "darkCyan": "#56b6c2",
+    "darkYellow": "#e5c07b",
+    "lightStep1": "#ffffff",
+    "lightStep2": "#fafafa",
+    "lightStep3": "#f5f5f5",
+    "lightStep4": "#ebebeb",
+    "lightStep5": "#e1e1e1",
+    "lightStep6": "#d4d4d4",
+    "lightStep7": "#b8b8b8",
+    "lightStep8": "#a0a0a0",
+    "lightStep9": "#3b7dd8",
+    "lightStep10": "#2968c3",
+    "lightStep11": "#8a8a8a",
+    "lightStep12": "#1a1a1a",
+    "lightSecondary": "#7b5bb6",
+    "lightAccent": "#d68c27",
+    "lightRed": "#d1383d",
+    "lightOrange": "#d68c27",
+    "lightGreen": "#3d9a57",
+    "lightCyan": "#318795",
+    "lightYellow": "#b0851f"
+  },
+  "theme": {
+    "primary": {
+      "dark": "darkStep9",
+      "light": "lightStep9"
+    },
+    "secondary": {
+      "dark": "darkSecondary",
+      "light": "lightSecondary"
+    },
+    "accent": {
+      "dark": "darkAccent",
+      "light": "lightAccent"
+    },
+    "error": {
+      "dark": "darkRed",
+      "light": "lightRed"
+    },
+    "warning": {
+      "dark": "darkOrange",
+      "light": "lightOrange"
+    },
+    "success": {
+      "dark": "darkGreen",
+      "light": "lightGreen"
+    },
+    "info": {
+      "dark": "darkCyan",
+      "light": "lightCyan"
+    },
+    "text": {
+      "dark": "darkStep12",
+      "light": "lightStep12"
+    },
+    "textMuted": {
+      "dark": "darkStep11",
+      "light": "lightStep11"
+    },
+    "background": {
+      "dark": "darkStep1",
+      "light": "lightStep1"
+    },
+    "backgroundPanel": {
+      "dark": "darkStep2",
+      "light": "lightStep2"
+    },
+    "backgroundElement": {
+      "dark": "darkStep3",
+      "light": "lightStep3"
+    },
+    "border": {
+      "dark": "darkStep7",
+      "light": "lightStep7"
+    },
+    "borderActive": {
+      "dark": "darkStep8",
+      "light": "lightStep8"
+    },
+    "borderSubtle": {
+      "dark": "darkStep6",
+      "light": "lightStep6"
+    },
+    "diffAdded": {
+      "dark": "#4fd6be",
+      "light": "#1e725c"
+    },
+    "diffRemoved": {
+      "dark": "#c53b53",
+      "light": "#c53b53"
+    },
+    "diffContext": {
+      "dark": "#828bb8",
+      "light": "#7086b5"
+    },
+    "diffHunkHeader": {
+      "dark": "#828bb8",
+      "light": "#7086b5"
+    },
+    "diffHighlightAdded": {
+      "dark": "#b8db87",
+      "light": "#4db380"
+    },
+    "diffHighlightRemoved": {
+      "dark": "#e26a75",
+      "light": "#f52a65"
+    },
+    "diffAddedBg": {
+      "dark": "#20303b",
+      "light": "#d5e5d5"
+    },
+    "diffRemovedBg": {
+      "dark": "#37222c",
+      "light": "#f7d8db"
+    },
+    "diffContextBg": {
+      "dark": "darkStep2",
+      "light": "lightStep2"
+    },
+    "diffLineNumber": {
+      "dark": "darkStep3",
+      "light": "lightStep3"
+    },
+    "diffAddedLineNumberBg": {
+      "dark": "#1b2b34",
+      "light": "#c5d5c5"
+    },
+    "diffRemovedLineNumberBg": {
+      "dark": "#2d1f26",
+      "light": "#e7c8cb"
+    },
+    "markdownText": {
+      "dark": "darkStep12",
+      "light": "lightStep12"
+    },
+    "markdownHeading": {
+      "dark": "darkAccent",
+      "light": "lightAccent"
+    },
+    "markdownLink": {
+      "dark": "darkStep9",
+      "light": "lightStep9"
+    },
+    "markdownLinkText": {
+      "dark": "darkCyan",
+      "light": "lightCyan"
+    },
+    "markdownCode": {
+      "dark": "darkGreen",
+      "light": "lightGreen"
+    },
+    "markdownBlockQuote": {
+      "dark": "darkYellow",
+      "light": "lightYellow"
+    },
+    "markdownEmph": {
+      "dark": "darkYellow",
+      "light": "lightYellow"
+    },
+    "markdownStrong": {
+      "dark": "darkOrange",
+      "light": "lightOrange"
+    },
+    "markdownHorizontalRule": {
+      "dark": "darkStep11",
+      "light": "lightStep11"
+    },
+    "markdownListItem": {
+      "dark": "darkStep9",
+      "light": "lightStep9"
+    },
+    "markdownListEnumeration": {
+      "dark": "darkCyan",
+      "light": "lightCyan"
+    },
+    "markdownImage": {
+      "dark": "darkStep9",
+      "light": "lightStep9"
+    },
+    "markdownImageText": {
+      "dark": "darkCyan",
+      "light": "lightCyan"
+    },
+    "markdownCodeBlock": {
+      "dark": "darkStep12",
+      "light": "lightStep12"
+    },
+    "syntaxComment": {
+      "dark": "darkStep11",
+      "light": "lightStep11"
+    },
+    "syntaxKeyword": {
+      "dark": "darkAccent",
+      "light": "lightAccent"
+    },
+    "syntaxFunction": {
+      "dark": "darkStep9",
+      "light": "lightStep9"
+    },
+    "syntaxVariable": {
+      "dark": "darkRed",
+      "light": "lightRed"
+    },
+    "syntaxString": {
+      "dark": "darkGreen",
+      "light": "lightGreen"
+    },
+    "syntaxNumber": {
+      "dark": "darkOrange",
+      "light": "lightOrange"
+    },
+    "syntaxType": {
+      "dark": "darkYellow",
+      "light": "lightYellow"
+    },
+    "syntaxOperator": {
+      "dark": "darkCyan",
+      "light": "lightCyan"
+    },
+    "syntaxPunctuation": {
+      "dark": "darkStep12",
+      "light": "lightStep12"
+    }
+  }
+}
--- a/src/themes/schema.json
+++ b/src/themes/schema.json
@@ -0,0 +1,59 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "defs": {},
+  "theme": {
+    "primary": "#000000",
+    "secondary": "#000000",
+    "accent": "#000000",
+    "error": "#000000",
+    "warning": "#000000",
+    "success": "#000000",
+    "info": "#000000",
+    "text": "#000000",
+    "textMuted": "#000000",
+    "selectedListItemText": "#000000",
+    "background": "#000000",
+    "backgroundPanel": "#000000",
+    "backgroundElement": "#000000",
+    "backgroundMenu": "#000000",
+    "border": "#000000",
+    "borderActive": "#000000",
+    "borderSubtle": "#000000",
+    "diffAdded": "#000000",
+    "diffRemoved": "#000000",
+    "diffContext": "#000000",
+    "diffHunkHeader": "#000000",
+    "diffHighlightAdded": "#000000",
+    "diffHighlightRemoved": "#000000",
+    "diffAddedBg": "#000000",
+    "diffRemovedBg": "#000000",
+    "diffContextBg": "#000000",
+    "diffLineNumber": "#000000",
+    "diffAddedLineNumberBg": "#000000",
+    "diffRemovedLineNumberBg": "#000000",
+    "markdownText": "#000000",
+    "markdownHeading": "#000000",
+    "markdownLink": "#000000",
+    "markdownLinkText": "#000000",
+    "markdownCode": "#000000",
+    "markdownBlockQuote": "#000000",
+    "markdownEmph": "#000000",
+    "markdownStrong": "#000000",
+    "markdownHorizontalRule": "#000000",
+    "markdownListItem": "#000000",
+    "markdownListEnumeration": "#000000",
+    "markdownImage": "#000000",
+    "markdownImageText": "#000000",
+    "markdownCodeBlock": "#000000",
+    "syntaxComment": "#000000",
+    "syntaxKeyword": "#000000",
+    "syntaxFunction": "#000000",
+    "syntaxVariable": "#000000",
+    "syntaxString": "#000000",
+    "syntaxNumber": "#000000",
+    "syntaxType": "#000000",
+    "syntaxOperator": "#000000",
+    "syntaxPunctuation": "#000000",
+    "thinkingOpacity": 0.6
+  }
+}
--- a/src/themes/tokyo.json
+++ b/src/themes/tokyo.json
@@ -0,0 +1,74 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "defs": {
+    "background": "transparent",
+    "surface": "#1a1b26",
+    "primary": "#7aa2f7",
+    "secondary": "#bb9af7",
+    "accent": "#e0af68",
+    "text": "#c0caf5",
+    "muted": "#565f89",
+    "warning": "#e0af68",
+    "error": "#f7768e",
+    "success": "#9ece6a",
+    "layer0": "transparent",
+    "layer1": "#16161e",
+    "layer2": "#0f0f15",
+    "layer3": "#08080b"
+  },
+  "theme": {
+    "primary": "primary",
+    "secondary": "secondary",
+    "accent": "accent",
+    "error": "error",
+    "warning": "warning",
+    "success": "success",
+    "info": "secondary",
+    "text": "text",
+    "textMuted": "muted",
+    "selectedListItemText": "background",
+    "background": "background",
+    "backgroundPanel": "surface",
+    "backgroundElement": "layer1",
+    "backgroundMenu": "layer1",
+    "border": "muted",
+    "borderActive": "primary",
+    "borderSubtle": "muted",
+    "diffAdded": "success",
+    "diffRemoved": "error",
+    "diffContext": "muted",
+    "diffHunkHeader": "muted",
+    "diffHighlightAdded": "success",
+    "diffHighlightRemoved": "error",
+    "diffAddedBg": "layer2",
+    "diffRemovedBg": "layer3",
+    "diffContextBg": "layer1",
+    "diffLineNumber": "muted",
+    "diffAddedLineNumberBg": "layer2",
+    "diffRemovedLineNumberBg": "layer3",
+    "markdownText": "text",
+    "markdownHeading": "accent",
+    "markdownLink": "primary",
+    "markdownLinkText": "secondary",
+    "markdownCode": "success",
+    "markdownBlockQuote": "warning",
+    "markdownEmph": "warning",
+    "markdownStrong": "accent",
+    "markdownHorizontalRule": "muted",
+    "markdownListItem": "primary",
+    "markdownListEnumeration": "secondary",
+    "markdownImage": "primary",
+    "markdownImageText": "secondary",
+    "markdownCodeBlock": "text",
+    "syntaxComment": "muted",
+    "syntaxKeyword": "accent",
+    "syntaxFunction": "primary",
+    "syntaxVariable": "secondary",
+    "syntaxString": "success",
+    "syntaxNumber": "warning",
+    "syntaxType": "accent",
+    "syntaxOperator": "secondary",
+    "syntaxPunctuation": "text",
+    "thinkingOpacity": 0.6
+  }
+}
--- a/src/types/desktop-theme.ts
+++ b/src/types/desktop-theme.ts
@@ -1,10 +1,12 @@
 import type {
  DesktopTheme,
  ThemeColors,
+  ThemeDefinition,
  ThemeName,
  ThemeToken,
  ThemeVariant,
 } from "../types/settings"
+import type { ColorValue } from "./theme-schema"

 // Base theme colors
 export const BASE_THEME_COLORS: ThemeColors = {
@@ -150,3 +152,9 @@ export function getDefaultTheme(): ThemeVariant {
    (variant) => variant.name === THEMES_DESKTOP.defaultVariant
  )!
 }
+
+export type ThemeJsonFile = ThemeDefinition
+
+export function isColorReference(value: ColorValue): value is string {
+  return typeof value === "string" && !value.startsWith("#")
+}
--- a/src/types/settings.ts
+++ b/src/types/settings.ts
@@ -1,23 +1,26 @@
+import type { RGBA } from "@opentui/core"
+import type { ColorValue, ThemeJson, Variant } from "./theme-schema"
+
 export type ThemeName = "system" | "catppuccin" | "gruvbox" | "tokyo" | "nord" | "custom"

 export type LayerBackgrounds = {
-  layer0: string
-  layer1: string
-  layer2: string
-  layer3: string
+  layer0: ColorValue
+  layer1: ColorValue
+  layer2: ColorValue
+  layer3: ColorValue
 }

 export type ThemeColors = {
-  background: string
-  surface: string
-  primary: string
-  secondary: string
-  accent: string
-  text: string
-  muted: string
-  warning: string
-  error: string
-  success: string
+  background: ColorValue
+  surface: ColorValue
+  primary: ColorValue
+  secondary: ColorValue
+  accent: ColorValue
+  text: ColorValue
+  muted: ColorValue
+  warning: ColorValue
+  error: ColorValue
+  success: ColorValue
  layerBackgrounds?: LayerBackgrounds
 }

@@ -30,8 +33,10 @@ export type ThemeToken = {
  [key: string]: string
 }

-export type ResolvedTheme = ThemeColors & {
-  layerBackgrounds: LayerBackgrounds
+export type ResolvedTheme = Record<string, RGBA> & {
+  layerBackgrounds: Record<string, RGBA>
+  _hasSelectedListItemText: boolean
+  thinkingOpacity: number
 }

 export type DesktopTheme = {
@@ -58,3 +63,7 @@ export type AppState = {
  preferences: UserPreferences
  customTheme: ThemeColors
 }
+
+export type ThemeMode = "dark" | "light"
+export type ThemeVariantValue = Variant
+export type ThemeDefinition = ThemeJson
--- a/src/types/theme-schema.ts
+++ b/src/types/theme-schema.ts
@@ -0,0 +1,26 @@
+import type { RGBA } from "@opentui/core"
+
+export type HexColor = `#${string}`
+export type RefName = string
+
+export type Variant = {
+  dark: HexColor | RefName
+  light: HexColor | RefName
+}
+
+export type ColorValue = HexColor | RefName | Variant | RGBA | number
+
+export type ThemeJson = {
+  $schema?: string
+  defs?: Record<string, HexColor | RefName>
+  theme: Record<string, ColorValue> & {
+    selectedListItemText?: ColorValue
+    backgroundMenu?: ColorValue
+    thinkingOpacity?: number
+  }
+}
+
+export type ThemeColors = Record<string, RGBA> & {
+  _hasSelectedListItemText: boolean
+  thinkingOpacity: number
+}
--- a/src/utils/ansi-to-rgba.ts
+++ b/src/utils/ansi-to-rgba.ts
@@ -0,0 +1,41 @@
+import { RGBA } from "@opentui/core"
+
+export function ansiToRgba(code: number) {
+  if (code < 16) {
+    const ansi = [
+      "#000000",
+      "#800000",
+      "#008000",
+      "#808000",
+      "#000080",
+      "#800080",
+      "#008080",
+      "#c0c0c0",
+      "#808080",
+      "#ff0000",
+      "#00ff00",
+      "#ffff00",
+      "#0000ff",
+      "#ff00ff",
+      "#00ffff",
+      "#ffffff",
+    ]
+    return RGBA.fromHex(ansi[code] ?? "#000000")
+  }
+
+  if (code < 232) {
+    const index = code - 16
+    const b = index % 6
+    const g = Math.floor(index / 6) % 6
+    const r = Math.floor(index / 36)
+    const value = (x: number) => (x === 0 ? 0 : x * 40 + 55)
+    return RGBA.fromInts(value(r), value(g), value(b))
+  }
+
+  if (code < 256) {
+    const gray = (code - 232) * 10 + 8
+    return RGBA.fromInts(gray, gray, gray)
+  }
+
+  return RGBA.fromInts(0, 0, 0)
+}
--- a/src/utils/color-generation.ts
+++ b/src/utils/color-generation.ts
@@ -0,0 +1,67 @@
+import { RGBA } from "@opentui/core"
+
+export function tint(base: RGBA, overlay: RGBA, alpha: number) {
+  const r = base.r + (overlay.r - base.r) * alpha
+  const g = base.g + (overlay.g - base.g) * alpha
+  const b = base.b + (overlay.b - base.b) * alpha
+  return RGBA.fromInts(Math.round(r * 255), Math.round(g * 255), Math.round(b * 255))
+}
+
+export function generateGrayScale(bg: RGBA, isDark: boolean) {
+  const grays: Record<number, RGBA> = {}
+  const bgR = bg.r * 255
+  const bgG = bg.g * 255
+  const bgB = bg.b * 255
+  const luminance = 0.299 * bgR + 0.587 * bgG + 0.114 * bgB
+
+  for (let i = 1; i <= 12; i++) {
+    const factor = i / 12.0
+
+    if (isDark) {
+      if (luminance < 10) {
+        const gray = Math.floor(factor * 0.4 * 255)
+        grays[i] = RGBA.fromInts(gray, gray, gray)
+      } else {
+        const newLum = luminance + (255 - luminance) * factor * 0.4
+        const ratio = newLum / luminance
+        grays[i] = RGBA.fromInts(
+          Math.min(bgR * ratio, 255),
+          Math.min(bgG * ratio, 255),
+          Math.min(bgB * ratio, 255)
+        )
+      }
+    } else {
+      if (luminance > 245) {
+        const gray = Math.floor(255 - factor * 0.4 * 255)
+        grays[i] = RGBA.fromInts(gray, gray, gray)
+      } else {
+        const newLum = luminance * (1 - factor * 0.4)
+        const ratio = newLum / luminance
+        grays[i] = RGBA.fromInts(
+          Math.max(bgR * ratio, 0),
+          Math.max(bgG * ratio, 0),
+          Math.max(bgB * ratio, 0)
+        )
+      }
+    }
+  }
+
+  return grays
+}
+
+export function generateMutedTextColor(bg: RGBA, isDark: boolean) {
+  const bgR = bg.r * 255
+  const bgG = bg.g * 255
+  const bgB = bg.b * 255
+  const bgLum = 0.299 * bgR + 0.587 * bgG + 0.114 * bgB
+
+  if (isDark) {
+    if (bgLum < 10) return RGBA.fromInts(180, 180, 180)
+    const gray = Math.min(Math.floor(160 + bgLum * 0.3), 200)
+    return RGBA.fromInts(gray, gray, gray)
+  }
+
+  if (bgLum > 245) return RGBA.fromInts(75, 75, 75)
+  const gray = Math.max(Math.floor(100 - (255 - bgLum) * 0.2), 60)
+  return RGBA.fromInts(gray, gray, gray)
+}
--- a/src/utils/custom-themes.ts
+++ b/src/utils/custom-themes.ts
@@ -0,0 +1,23 @@
+import path from "path"
+import type { ThemeJson } from "../types/theme-schema"
+import { validateTheme } from "./theme-loader"
+
+export async function getCustomThemes() {
+  const dirs = [
+    path.join(process.env.HOME ?? "", ".config/podtui/themes"),
+    path.resolve(process.cwd(), ".podtui/themes"),
+    path.resolve(process.cwd(), "themes"),
+  ]
+
+  const result: Record<string, ThemeJson> = {}
+  for (const dir of dirs) {
+    const glob = new Bun.Glob("*.json")
+    for await (const item of glob.scan({ absolute: true, followSymlinks: true, cwd: dir })) {
+      const name = path.basename(item, ".json")
+      const json = (await Bun.file(item).json()) as ThemeJson
+      validateTheme(json, item)
+      result[name] = json
+    }
+  }
+  return result
+}
--- a/src/utils/syntax-highlighter.ts
+++ b/src/utils/syntax-highlighter.ts
@@ -0,0 +1,29 @@
+import { RGBA, SyntaxStyle } from "@opentui/core"
+import { getSyntaxRules } from "./syntax-rules"
+
+export function generateSyntax(theme: Record<string, RGBA>) {
+  return SyntaxStyle.fromTheme(getSyntaxRules(theme))
+}
+
+export function generateSubtleSyntax(theme: Record<string, RGBA> & { thinkingOpacity?: number }) {
+  const rules = getSyntaxRules(theme)
+  const opacity = theme.thinkingOpacity ?? 0.6
+  return SyntaxStyle.fromTheme(
+    rules.map((rule) => {
+      if (!rule.style.foreground) return rule
+      const fg = rule.style.foreground
+      return {
+        ...rule,
+        style: {
+          ...rule.style,
+          foreground: RGBA.fromInts(
+            Math.round(fg.r * 255),
+            Math.round(fg.g * 255),
+            Math.round(fg.b * 255),
+            Math.round(opacity * 255)
+          ),
+        },
+      }
+    })
+  )
+}
--- a/src/utils/syntax-rules.ts
+++ b/src/utils/syntax-rules.ts
@@ -0,0 +1,40 @@
+import type { RGBA } from "@opentui/core"
+
+export type SyntaxRule = {
+  scope: string[]
+  style: {
+    foreground?: RGBA
+    background?: RGBA
+    bold?: boolean
+    italic?: boolean
+    underline?: boolean
+  }
+}
+
+export function getSyntaxRules(theme: Record<string, RGBA>): SyntaxRule[] {
+  return [
+    { scope: ["default"], style: { foreground: theme.text } },
+    { scope: ["comment", "comment.documentation"], style: { foreground: theme.syntaxComment, italic: true } },
+    { scope: ["string", "symbol", "character.special"], style: { foreground: theme.syntaxString } },
+    { scope: ["number", "boolean", "constant"], style: { foreground: theme.syntaxNumber } },
+    { scope: ["keyword.return", "keyword.conditional", "keyword.repeat", "keyword.coroutine"], style: { foreground: theme.syntaxKeyword, italic: true } },
+    { scope: ["keyword.type", "type.definition", "class"], style: { foreground: theme.syntaxType, bold: true } },
+    { scope: ["keyword.function", "function", "function.method"], style: { foreground: theme.syntaxFunction } },
+    { scope: ["keyword", "keyword.import", "keyword.export"], style: { foreground: theme.syntaxKeyword, italic: true } },
+    { scope: ["operator", "keyword.operator", "punctuation", "punctuation.delimiter"], style: { foreground: theme.syntaxOperator } },
+    { scope: ["variable", "variable.parameter", "property"], style: { foreground: theme.syntaxVariable } },
+    { scope: ["type", "module", "namespace"], style: { foreground: theme.syntaxType } },
+    { scope: ["punctuation.bracket"], style: { foreground: theme.syntaxPunctuation } },
+    { scope: ["markup.heading", "markup.heading.1", "markup.heading.2", "markup.heading.3", "markup.heading.4", "markup.heading.5", "markup.heading.6"], style: { foreground: theme.markdownHeading, bold: true } },
+    { scope: ["markup.bold", "markup.strong"], style: { foreground: theme.markdownStrong, bold: true } },
+    { scope: ["markup.italic"], style: { foreground: theme.markdownEmph, italic: true } },
+    { scope: ["markup.list"], style: { foreground: theme.markdownListItem } },
+    { scope: ["markup.quote"], style: { foreground: theme.markdownBlockQuote, italic: true } },
+    { scope: ["markup.raw", "markup.raw.block"], style: { foreground: theme.markdownCode } },
+    { scope: ["markup.link", "markup.link.url", "string.special.url"], style: { foreground: theme.markdownLink, underline: true } },
+    { scope: ["markup.link.label", "label"], style: { foreground: theme.markdownLinkText, underline: true } },
+    { scope: ["diff.plus"], style: { foreground: theme.diffAdded, background: theme.diffAddedBg } },
+    { scope: ["diff.minus"], style: { foreground: theme.diffRemoved, background: theme.diffRemovedBg } },
+    { scope: ["diff.delta"], style: { foreground: theme.diffContext, background: theme.diffContextBg } },
+  ]
+}
--- a/src/utils/system-theme.ts
+++ b/src/utils/system-theme.ts
@@ -0,0 +1,110 @@
+import { RGBA, type TerminalColors } from "@opentui/core"
+import { ansiToRgba } from "./ansi-to-rgba"
+import { generateGrayScale, generateMutedTextColor, tint } from "./color-generation"
+import type { ThemeJson } from "../types/theme-schema"
+
+let cached: TerminalColors | null = null
+
+export function clearPaletteCache() {
+  cached = null
+}
+
+export function detectSystemTheme(colors: TerminalColors) {
+  const bg = RGBA.fromHex(colors.defaultBackground ?? colors.palette[0] ?? "#000000")
+  const luminance = 0.299 * bg.r + 0.587 * bg.g + 0.114 * bg.b
+  const mode = luminance > 0.5 ? "light" : "dark"
+  return { mode, background: bg }
+}
+
+export function generateSystemTheme(colors: TerminalColors, mode: "dark" | "light"): ThemeJson {
+  cached = colors
+  const bg = RGBA.fromHex(colors.defaultBackground ?? colors.palette[0] ?? "#000000")
+  const fg = RGBA.fromHex(colors.defaultForeground ?? colors.palette[7] ?? "#ffffff")
+  const transparent = RGBA.fromInts(0, 0, 0, 0)
+  const isDark = mode === "dark"
+
+  const col = (i: number) => {
+    const value = colors.palette[i]
+    if (value) return RGBA.fromHex(value)
+    return ansiToRgba(i)
+  }
+
+  const grays = generateGrayScale(bg, isDark)
+  const textMuted = generateMutedTextColor(bg, isDark)
+
+  const ansi = {
+    black: col(0),
+    red: col(1),
+    green: col(2),
+    yellow: col(3),
+    blue: col(4),
+    magenta: col(5),
+    cyan: col(6),
+    white: col(7),
+    redBright: col(9),
+    greenBright: col(10),
+  }
+
+  const diffAlpha = isDark ? 0.22 : 0.14
+  const diffAddedBg = tint(bg, ansi.green, diffAlpha)
+  const diffRemovedBg = tint(bg, ansi.red, diffAlpha)
+  const diffAddedLineNumberBg = tint(grays[3], ansi.green, diffAlpha)
+  const diffRemovedLineNumberBg = tint(grays[3], ansi.red, diffAlpha)
+
+  return {
+    theme: {
+      primary: ansi.cyan,
+      secondary: ansi.magenta,
+      accent: ansi.cyan,
+      error: ansi.red,
+      warning: ansi.yellow,
+      success: ansi.green,
+      info: ansi.cyan,
+      text: fg,
+      textMuted,
+      selectedListItemText: bg,
+      background: transparent,
+      backgroundPanel: grays[2],
+      backgroundElement: grays[3],
+      backgroundMenu: grays[3],
+      borderSubtle: grays[6],
+      border: grays[7],
+      borderActive: grays[8],
+      diffAdded: ansi.green,
+      diffRemoved: ansi.red,
+      diffContext: grays[7],
+      diffHunkHeader: grays[7],
+      diffHighlightAdded: ansi.greenBright,
+      diffHighlightRemoved: ansi.redBright,
+      diffAddedBg,
+      diffRemovedBg,
+      diffContextBg: grays[1],
+      diffLineNumber: grays[6],
+      diffAddedLineNumberBg,
+      diffRemovedLineNumberBg,
+      markdownText: fg,
+      markdownHeading: fg,
+      markdownLink: ansi.blue,
+      markdownLinkText: ansi.cyan,
+      markdownCode: ansi.green,
+      markdownBlockQuote: ansi.yellow,
+      markdownEmph: ansi.yellow,
+      markdownStrong: fg,
+      markdownHorizontalRule: grays[7],
+      markdownListItem: ansi.blue,
+      markdownListEnumeration: ansi.cyan,
+      markdownImage: ansi.blue,
+      markdownImageText: ansi.cyan,
+      markdownCodeBlock: fg,
+      syntaxComment: textMuted,
+      syntaxKeyword: ansi.magenta,
+      syntaxFunction: ansi.blue,
+      syntaxVariable: fg,
+      syntaxString: ansi.green,
+      syntaxNumber: ansi.yellow,
+      syntaxType: ansi.cyan,
+      syntaxOperator: ansi.cyan,
+      syntaxPunctuation: fg,
+    },
+  }
+}
--- a/src/utils/theme-css.ts
+++ b/src/utils/theme-css.ts
@@ -0,0 +1,36 @@
+import { RGBA } from "@opentui/core"
+import type { ColorValue } from "../types/theme-schema"
+
+const toCss = (value: ColorValue | RGBA) => {
+  if (value instanceof RGBA) {
+    const r = Math.round(value.r * 255)
+    const g = Math.round(value.g * 255)
+    const b = Math.round(value.b * 255)
+    return `rgba(${r}, ${g}, ${b}, ${value.a})`
+  }
+  if (typeof value === "number") return `var(--ansi-${value})`
+  if (typeof value === "string") return value
+  return value.dark
+}
+
+export function applyThemeToCSS(theme: Record<string, RGBA | ColorValue>) {
+  const root = document.documentElement
+  for (const [key, value] of Object.entries(theme)) {
+    if (key === "layerBackgrounds" && typeof value === "object") {
+      const layers = value as Record<string, RGBA | ColorValue>
+      for (const [layer, color] of Object.entries(layers)) {
+        root.style.setProperty(`--color-${layer}`, toCss(color))
+      }
+    } else {
+      root.style.setProperty(`--color-${key}`, toCss(value as ColorValue | RGBA))
+    }
+  }
+}
+
+export function setThemeAttribute(themeName: string) {
+  document.documentElement.setAttribute("data-theme", themeName)
+}
+
+export function resolveColorReference(value: ColorValue) {
+  return toCss(value)
+}
--- a/src/utils/theme-loader.ts
+++ b/src/utils/theme-loader.ts
@@ -0,0 +1,49 @@
+import path from "path"
+import type { ThemeJson } from "../types/theme-schema"
+import { THEME_JSON } from "../constants/themes"
+
+export async function loadTheme(name: string) {
+  if (THEME_JSON[name]) return THEME_JSON[name]
+  const file = path.resolve(process.cwd(), "themes", `${name}.json`)
+  return loadThemeFromPath(file)
+}
+
+export async function loadThemeFromPath(file: string) {
+  const json = (await Bun.file(file).json()) as ThemeJson
+  validateTheme(json, file)
+  return json
+}
+
+export async function getAllThemes() {
+  return { ...THEME_JSON, ...(await getCustomThemes()) }
+}
+
+export async function getCustomThemes() {
+  const dirs = [
+    path.join(process.env.HOME ?? "", ".config/podtui/themes"),
+    path.resolve(process.cwd(), ".podtui/themes"),
+    path.resolve(process.cwd(), "themes"),
+  ]
+
+  const result: Record<string, ThemeJson> = {}
+  for (const dir of dirs) {
+    const glob = new Bun.Glob("*.json")
+    for await (const item of glob.scan({ absolute: true, followSymlinks: true, cwd: dir })) {
+      const name = path.basename(item, ".json")
+      const json = (await Bun.file(item).json()) as ThemeJson
+      validateTheme(json, item)
+      result[name] = json
+    }
+  }
+  return result
+}
+
+export function validateTheme(theme: ThemeJson, source?: string) {
+  if (!theme || typeof theme !== "object") {
+    throw new Error(`Invalid theme${source ? ` (${source})` : ""}`)
+  }
+  if (!theme.theme || typeof theme.theme !== "object") {
+    throw new Error(`Theme missing 'theme' object${source ? ` (${source})` : ""}`)
+  }
+  return true
+}
--- a/src/utils/theme-resolver.ts
+++ b/src/utils/theme-resolver.ts
@@ -0,0 +1,46 @@
+import { RGBA } from "@opentui/core"
+import type { ColorValue, ThemeJson } from "../types/theme-schema"
+import { ansiToRgba } from "./ansi-to-rgba"
+
+export type ThemeMode = "dark" | "light"
+
+export function resolveTheme(theme: ThemeJson, mode: ThemeMode) {
+  const defs = theme.defs ?? {}
+
+  function resolveColor(value: ColorValue): RGBA {
+    if (value instanceof RGBA) return value
+    if (typeof value === "number") return ansiToRgba(value)
+    if (typeof value === "string") {
+      if (value === "transparent" || value === "none") return RGBA.fromInts(0, 0, 0, 0)
+      if (value.startsWith("#")) return RGBA.fromHex(value)
+      if (defs[value] != null) return resolveColor(defs[value])
+      const ref = theme.theme[value]
+      if (ref != null) return resolveColor(ref)
+      throw new Error(`Color reference "${value}" not found in defs or theme`)
+    }
+    return resolveColor(value[mode])
+  }
+
+  const resolved = Object.fromEntries(
+    Object.entries(theme.theme)
+      .filter(([key]) => key !== "selectedListItemText" && key !== "backgroundMenu" && key !== "thinkingOpacity")
+      .map(([key, value]) => [key, resolveColor(value)])
+  ) as Record<string, RGBA>
+
+  const hasSelected = theme.theme.selectedListItemText !== undefined
+  resolved.selectedListItemText = hasSelected
+    ? resolveColor(theme.theme.selectedListItemText!)
+    : resolved.background
+
+  resolved.backgroundMenu = theme.theme.backgroundMenu
+    ? resolveColor(theme.theme.backgroundMenu)
+    : resolved.backgroundElement
+
+  const thinkingOpacity = theme.theme.thinkingOpacity ?? 0.6
+
+  return {
+    ...resolved,
+    _hasSelectedListItemText: hasSelected,
+    thinkingOpacity,
+  }
+}
--- a/src/utils/theme.test.ts
+++ b/src/utils/theme.test.ts
@@ -0,0 +1,71 @@
+import { describe, expect, it } from "bun:test"
+import { ansiToRgba } from "./ansi-to-rgba"
+import { resolveTheme } from "./theme-resolver"
+import type { ThemeJson } from "../types/theme-schema"
+
+describe("theme utils", () => {
+  it("converts ansi codes", () => {
+    const color = ansiToRgba(1)
+    expect(color).toBeTruthy()
+  })
+
+  it("resolves simple theme", () => {
+    const json: ThemeJson = {
+      theme: {
+        primary: "#ffffff",
+        secondary: "#000000",
+        accent: "#000000",
+        error: "#000000",
+        warning: "#000000",
+        success: "#000000",
+        info: "#000000",
+        text: "#000000",
+        textMuted: "#000000",
+        background: "#000000",
+        backgroundPanel: "#000000",
+        backgroundElement: "#000000",
+        border: "#000000",
+        borderActive: "#000000",
+        borderSubtle: "#000000",
+        diffAdded: "#000000",
+        diffRemoved: "#000000",
+        diffContext: "#000000",
+        diffHunkHeader: "#000000",
+        diffHighlightAdded: "#000000",
+        diffHighlightRemoved: "#000000",
+        diffAddedBg: "#000000",
+        diffRemovedBg: "#000000",
+        diffContextBg: "#000000",
+        diffLineNumber: "#000000",
+        diffAddedLineNumberBg: "#000000",
+        diffRemovedLineNumberBg: "#000000",
+        markdownText: "#000000",
+        markdownHeading: "#000000",
+        markdownLink: "#000000",
+        markdownLinkText: "#000000",
+        markdownCode: "#000000",
+        markdownBlockQuote: "#000000",
+        markdownEmph: "#000000",
+        markdownStrong: "#000000",
+        markdownHorizontalRule: "#000000",
+        markdownListItem: "#000000",
+        markdownListEnumeration: "#000000",
+        markdownImage: "#000000",
+        markdownImageText: "#000000",
+        markdownCodeBlock: "#000000",
+        syntaxComment: "#000000",
+        syntaxKeyword: "#000000",
+        syntaxFunction: "#000000",
+        syntaxVariable: "#000000",
+        syntaxString: "#000000",
+        syntaxNumber: "#000000",
+        syntaxType: "#000000",
+        syntaxOperator: "#000000",
+        syntaxPunctuation: "#000000",
+      },
+    }
+
+    const resolved = resolveTheme(json, "dark") as unknown as { primary: unknown }
+    expect(resolved.primary).toBeTruthy()
+  })
+})
--- a/src/utils/theme.ts
+++ b/src/utils/theme.ts
@@ -3,44 +3,42 @@
 * Handles dynamic theme switching by updating CSS custom properties
 */

-export function applyTheme(theme: {
-  background: string
-  surface: string
-  primary: string
-  secondary: string
-  accent: string
-  text: string
-  muted: string
-  warning: string
-  error: string
-  success: string
-  layerBackgrounds?: {
-    layer0: string
-    layer1: string
-    layer2: string
-    layer3: string
+import { RGBA } from "@opentui/core"
+import type { ThemeColors } from "../types/settings"
+import type { ColorValue } from "../types/theme-schema"
+
+const toCss = (value: ColorValue | RGBA) => {
+  if (value instanceof RGBA) {
+    const r = Math.round(value.r * 255)
+    const g = Math.round(value.g * 255)
+    const b = Math.round(value.b * 255)
+    return `rgba(${r}, ${g}, ${b}, ${value.a})`
  }
-}) {
+  if (typeof value === "number") return `var(--ansi-${value})`
+  if (typeof value === "string") return value
+  return value.dark
+}
+
+export function applyTheme(theme: ThemeColors | Record<string, RGBA>) {
+  if (typeof document === "undefined") return
  const root = document.documentElement
+  root.style.setProperty("--color-background", toCss(theme.background as ColorValue))
+  root.style.setProperty("--color-surface", toCss(theme.surface as ColorValue))
+  root.style.setProperty("--color-primary", toCss(theme.primary as ColorValue))
+  root.style.setProperty("--color-secondary", toCss(theme.secondary as ColorValue))
+  root.style.setProperty("--color-accent", toCss(theme.accent as ColorValue))
+  root.style.setProperty("--color-text", toCss(theme.text as ColorValue))
+  root.style.setProperty("--color-muted", toCss(theme.muted as ColorValue))
+  root.style.setProperty("--color-warning", toCss(theme.warning as ColorValue))
+  root.style.setProperty("--color-error", toCss(theme.error as ColorValue))
+  root.style.setProperty("--color-success", toCss(theme.success as ColorValue))

-  // Apply base theme colors
-  root.style.setProperty("--color-background", theme.background)
-  root.style.setProperty("--color-surface", theme.surface)
-  root.style.setProperty("--color-primary", theme.primary)
-  root.style.setProperty("--color-secondary", theme.secondary)
-  root.style.setProperty("--color-accent", theme.accent)
-  root.style.setProperty("--color-text", theme.text)
-  root.style.setProperty("--color-muted", theme.muted)
-  root.style.setProperty("--color-warning", theme.warning)
-  root.style.setProperty("--color-error", theme.error)
-  root.style.setProperty("--color-success", theme.success)
-
-  // Apply layer backgrounds if available
-  if (theme.layerBackgrounds) {
-    root.style.setProperty("--color-layer0", theme.layerBackgrounds.layer0)
-    root.style.setProperty("--color-layer1", theme.layerBackgrounds.layer1)
-    root.style.setProperty("--color-layer2", theme.layerBackgrounds.layer2)
-    root.style.setProperty("--color-layer3", theme.layerBackgrounds.layer3)
+  const layers = theme.layerBackgrounds as Record<string, ColorValue> | undefined
+  if (layers) {
+    root.style.setProperty("--color-layer0", toCss(layers.layer0))
+    root.style.setProperty("--color-layer1", toCss(layers.layer1))
+    root.style.setProperty("--color-layer2", toCss(layers.layer2))
+    root.style.setProperty("--color-layer3", toCss(layers.layer3))
  }
 }

@@ -58,6 +56,7 @@ export function getSystemThemeMode(): "dark" | "light" {
 * Apply CSS variable data-theme attribute
 */
 export function setThemeAttribute(themeName: string) {
+  if (typeof document === "undefined") return
  const root = document.documentElement
  root.setAttribute("data-theme", themeName)
 }