diff --git a/web/index.html b/web/index.html
index fabb2eee..357b910d 100644
--- a/web/index.html
+++ b/web/index.html
@@ -41,11 +41,30 @@
             (function () {
                 var lightColor = '#ffffff'
                 var darkColor = '#1c1c1e'
+                var oledColor = '#000000'
+                var themeBackgrounds = {
+                    notion: { light: '#fafafa', dark: '#191919' },
+                    one: { light: '#fbfbff', dark: '#1f2433' },
+                    proof: { light: '#f8f7f2', dark: '#18231f' },
+                    raycast: { light: '#ffffff', dark: '#201617' },
+                    'rose-pine': { light: '#fffaf3', dark: '#191724' },
+                    solarized: { light: '#fdf6e3', dark: '#002b36' },
+                    vercel: { light: '#ffffff', dark: '#000000' },
+                    'vs-code-plus': { light: '#ffffff', dark: '#1e1e1e' },
+                    xcode: { light: '#f7f9ff', dark: '#1f2024' },
+                    linear: { light: '#f7f7fb', dark: '#08090d' },
+                    lobster: { light: '#fff7f4', dark: '#161821' },
+                    material: { light: '#fffbfe', dark: '#1c1b1f' },
+                    matrix: { light: '#f5fff7', dark: '#030806' },
+                    monokai: { light: '#f8f7ef', dark: '#272822' },
+                    'night-owl': { light: '#fbfdff', dark: '#011627' },
+                    nord: { light: '#eceff4', dark: '#2e3440' },
+                }
 
                 function getInitialScheme() {
                     try {
                         var appearance = localStorage.getItem('hapi-appearance')
-                        if (appearance === 'dark' || appearance === 'light') return appearance
+                        if (appearance === 'dark' || appearance === 'light' || appearance === 'oled') return appearance
                     } catch (error) {
                         // Ignore storage errors.
                     }
@@ -56,8 +75,20 @@
                 }
 
                 var scheme = getInitialScheme()
-                var color = scheme === 'dark' ? darkColor : lightColor
+                var colorTheme = 'default'
+                try {
+                    var storedColorTheme = localStorage.getItem('hapi-color-theme')
+                    if (storedColorTheme && themeBackgrounds[storedColorTheme]) colorTheme = storedColorTheme
+                } catch (error) {
+                    // Ignore storage errors.
+                }
+                var paletteScheme = scheme === 'light' ? 'light' : 'dark'
+                var color = colorTheme === 'default'
+                    ? (scheme === 'oled' ? oledColor : (scheme === 'dark' ? darkColor : lightColor))
+                    : themeBackgrounds[colorTheme][paletteScheme]
                 document.documentElement.setAttribute('data-theme', scheme)
+                document.documentElement.setAttribute('data-color-theme', colorTheme)
+                document.documentElement.style.backgroundColor = color
                 document.querySelector('meta[name="theme-color"]').setAttribute('content', color)
             })()
         </script>
@@ -65,6 +96,8 @@
         <style>
             html { background: #fff }
             html[data-theme="dark"] { background: #1c1c1e; color-scheme: dark }
+            html[data-theme="oled"] { background: #000; color-scheme: dark }
+            html[data-color-theme]:not([data-color-theme="default"]) { background: inherit }
         </style>
 
         <title>HAPI</title>
diff --git a/web/src/hooks/useColorTheme.test.ts b/web/src/hooks/useColorTheme.test.ts
new file mode 100644
index 00000000..682ee1f5
--- /dev/null
+++ b/web/src/hooks/useColorTheme.test.ts
@@ -0,0 +1,75 @@
+import { act, renderHook } from '@testing-library/react'
+import { beforeEach, describe, expect, it } from 'vitest'
+import {
+    applyColorTheme,
+    getColorThemeStorageKey,
+    getStoredColorTheme,
+    parseColorTheme,
+    useColorTheme,
+} from './useColorTheme'
+
+const THEME_VARS = ['--app-bg', '--app-fg', '--app-link', '--app-button', '--app-secondary-bg', '--app-chat-user-chip-bg']
+
+describe('useColorTheme', () => {
+    beforeEach(() => {
+        localStorage.clear()
+        document.documentElement.removeAttribute('data-color-theme')
+        document.documentElement.setAttribute('data-theme', 'light')
+        for (const name of THEME_VARS) document.documentElement.style.removeProperty(name)
+    })
+
+    it('parses invalid or missing stored values as default', () => {
+        expect(parseColorTheme(null)).toBe('default')
+        expect(parseColorTheme('unknown')).toBe('default')
+        expect(parseColorTheme('notion')).toBe('notion')
+    })
+
+    it('reads the stored color theme preference', () => {
+        localStorage.setItem(getColorThemeStorageKey(), 'rose-pine')
+        expect(getStoredColorTheme()).toBe('rose-pine')
+    })
+
+    it('applies a preset palette to the document css variables', () => {
+        applyColorTheme('one', 'light')
+        expect(document.documentElement).toHaveAttribute('data-color-theme', 'one')
+        expect(document.documentElement.style.getPropertyValue('--app-bg')).toBe('#fbfbff')
+        expect(document.documentElement.style.getPropertyValue('--app-link')).toBe('#526fff')
+    })
+
+    it('removes palette css variables when reset to default', () => {
+        applyColorTheme('one', 'dark')
+        applyColorTheme('default', 'dark')
+
+        expect(document.documentElement).toHaveAttribute('data-color-theme', 'default')
+        expect(document.documentElement.style.getPropertyValue('--app-bg')).toBe('')
+        expect(document.documentElement.style.getPropertyValue('--app-link')).toBe('')
+    })
+
+    it('persists non-default selections and removes the key for default', () => {
+        const { result } = renderHook(() => useColorTheme())
+
+        act(() => result.current.setColorTheme('night-owl'))
+        expect(localStorage.getItem(getColorThemeStorageKey())).toBe('night-owl')
+        expect(document.documentElement.style.getPropertyValue('--app-bg')).toBe('#fbfdff')
+
+        act(() => result.current.setColorTheme('default'))
+        expect(localStorage.getItem(getColorThemeStorageKey())).toBeNull()
+        expect(document.documentElement.style.getPropertyValue('--app-bg')).toBe('')
+    })
+
+    it('uses the current dark scheme when applying from the hook', () => {
+        document.documentElement.setAttribute('data-theme', 'dark')
+        const { result } = renderHook(() => useColorTheme())
+
+        act(() => result.current.setColorTheme('notion'))
+        expect(document.documentElement.style.getPropertyValue('--app-bg')).toBe('#191919')
+        expect(document.documentElement.style.getPropertyValue('--app-fg')).toBe('#d9d9d8')
+    })
+
+    it('uses dark palette contrast values for OLED', () => {
+        applyColorTheme('one', 'oled')
+
+        expect(document.documentElement.style.getPropertyValue('--app-bg')).toBe('#1f2433')
+        expect(document.documentElement.style.getPropertyValue('--app-chat-user-chip-bg')).toBe('rgba(123, 140, 255, 0.24)')
+    })
+})
diff --git a/web/src/hooks/useColorTheme.ts b/web/src/hooks/useColorTheme.ts
new file mode 100644
index 00000000..b79432b8
--- /dev/null
+++ b/web/src/hooks/useColorTheme.ts
@@ -0,0 +1,382 @@
+import { useCallback, useEffect, useState } from 'react'
+import type { ThemeColorKeyId } from './useThemeColors'
+
+export type ColorScheme = 'light' | 'dark' | 'oled'
+export type ColorThemePreset =
+    | 'default'
+    | 'notion'
+    | 'one'
+    | 'proof'
+    | 'raycast'
+    | 'rose-pine'
+    | 'solarized'
+    | 'vercel'
+    | 'vs-code-plus'
+    | 'xcode'
+    | 'linear'
+    | 'lobster'
+    | 'material'
+    | 'matrix'
+    | 'monokai'
+    | 'night-owl'
+    | 'nord'
+
+export type ColorThemeOption = {
+    value: ColorThemePreset
+    labelKey: string
+    preview: {
+        light: string
+        dark: string
+        accent: string
+    }
+}
+
+type ThemePalette = {
+    accent: string
+    background: string
+    foreground: string
+    hint: string
+    secondary: string
+    dialog: string
+    surface: string
+    surfaceHover: string
+    code: string
+    border: string
+    subtle: string
+    buttonText: string
+}
+
+const COLOR_THEME_KEY = 'hapi-color-theme'
+
+const COLOR_THEME_OPTIONS: ReadonlyArray<ColorThemeOption> = [
+    { value: 'default', labelKey: 'settings.display.colorTheme.default', preview: { light: '#ffffff', dark: '#1c1c1e', accent: '#111827' } },
+    { value: 'notion', labelKey: 'settings.display.colorTheme.notion', preview: { light: '#fafafa', dark: '#191919', accent: '#3183d8' } },
+    { value: 'one', labelKey: 'settings.display.colorTheme.one', preview: { light: '#fbfbff', dark: '#1f2433', accent: '#526fff' } },
+    { value: 'proof', labelKey: 'settings.display.colorTheme.proof', preview: { light: '#f8f7f2', dark: '#18231f', accent: '#2f7d5b' } },
+    { value: 'raycast', labelKey: 'settings.display.colorTheme.raycast', preview: { light: '#ffffff', dark: '#201617', accent: '#ff5555' } },
+    { value: 'rose-pine', labelKey: 'settings.display.colorTheme.rosePine', preview: { light: '#fffaf3', dark: '#191724', accent: '#c65f7b' } },
+    { value: 'solarized', labelKey: 'settings.display.colorTheme.solarized', preview: { light: '#fdf6e3', dark: '#002b36', accent: '#b58900' } },
+    { value: 'vercel', labelKey: 'settings.display.colorTheme.vercel', preview: { light: '#ffffff', dark: '#000000', accent: '#0070f3' } },
+    { value: 'vs-code-plus', labelKey: 'settings.display.colorTheme.vsCodePlus', preview: { light: '#ffffff', dark: '#1e1e1e', accent: '#007acc' } },
+    { value: 'xcode', labelKey: 'settings.display.colorTheme.xcode', preview: { light: '#f7f9ff', dark: '#1f2024', accent: '#0a84ff' } },
+    { value: 'linear', labelKey: 'settings.display.colorTheme.linear', preview: { light: '#f7f7fb', dark: '#08090d', accent: '#5e6ad2' } },
+    { value: 'lobster', labelKey: 'settings.display.colorTheme.lobster', preview: { light: '#fff7f4', dark: '#161821', accent: '#ff5b6e' } },
+    { value: 'material', labelKey: 'settings.display.colorTheme.material', preview: { light: '#fffbfe', dark: '#1c1b1f', accent: '#6750a4' } },
+    { value: 'matrix', labelKey: 'settings.display.colorTheme.matrix', preview: { light: '#f5fff7', dark: '#030806', accent: '#00ff66' } },
+    { value: 'monokai', labelKey: 'settings.display.colorTheme.monokai', preview: { light: '#f8f7ef', dark: '#272822', accent: '#a6e22e' } },
+    { value: 'night-owl', labelKey: 'settings.display.colorTheme.nightOwl', preview: { light: '#fbfdff', dark: '#011627', accent: '#82aaff' } },
+    { value: 'nord', labelKey: 'settings.display.colorTheme.nord', preview: { light: '#eceff4', dark: '#2e3440', accent: '#88c0d0' } },
+]
+
+const PALETTES: Record<Exclude<ColorThemePreset, 'default'>, Record<'light' | 'dark', ThemePalette>> = {
+    notion: {
+        light: palette('#3183d8', '#fafafa', '#37352f', '#787774', '#f1f1ef'),
+        dark: palette('#3183d8', '#191919', '#d9d9d8', '#9b9a97', '#252525'),
+    },
+    one: {
+        light: palette('#526fff', '#fbfbff', '#383a42', '#696c77', '#f0f2ff'),
+        dark: palette('#7b8cff', '#1f2433', '#d8dee9', '#aab2c0', '#2c3245'),
+    },
+    proof: {
+        light: palette('#2f7d5b', '#f8f7f2', '#26352f', '#64706b', '#eef1ea'),
+        dark: palette('#7fc8a6', '#18231f', '#d9e4dc', '#9dafaa', '#23332d'),
+    },
+    raycast: {
+        light: palette('#ff4d4d', '#ffffff', '#2b2b31', '#72727a', '#fff0f0'),
+        dark: palette('#ff6363', '#201617', '#f3eded', '#c9bfc0', '#321f21'),
+    },
+    'rose-pine': {
+        light: palette('#d7827e', '#fffaf3', '#575279', '#797593', '#f2e9e1'),
+        dark: palette('#ebbcba', '#191724', '#e0def4', '#908caa', '#26233a'),
+    },
+    solarized: {
+        light: palette('#b58900', '#fdf6e3', '#586e75', '#839496', '#eee8d5'),
+        dark: palette('#268bd2', '#002b36', '#93a1a1', '#839496', '#073642'),
+    },
+    vercel: {
+        light: palette('#0070f3', '#ffffff', '#111111', '#666666', '#f5f5f5'),
+        dark: palette('#3291ff', '#000000', '#ededed', '#a1a1a1', '#111111'),
+    },
+    'vs-code-plus': {
+        light: palette('#007acc', '#ffffff', '#24292f', '#6e7781', '#f3f6f8'),
+        dark: palette('#3794ff', '#1e1e1e', '#d4d4d4', '#9cdcfe', '#252526'),
+    },
+    xcode: {
+        light: palette('#0a84ff', '#f7f9ff', '#1f2328', '#59636e', '#eef4ff'),
+        dark: palette('#409cff', '#1f2024', '#eef2ff', '#a9b0bd', '#2a2c33'),
+    },
+    linear: {
+        light: palette('#5e6ad2', '#f7f7fb', '#25262f', '#70717d', '#eeeeF8'),
+        dark: palette('#8a91f6', '#08090d', '#f7f8ff', '#a6a8b5', '#151722'),
+    },
+    lobster: {
+        light: palette('#e84d68', '#fff7f4', '#33262b', '#7d636a', '#ffe9e2'),
+        dark: palette('#ff5b6e', '#161821', '#f5d7dc', '#be9ca5', '#242333'),
+    },
+    material: {
+        light: palette('#6750a4', '#fffbfe', '#1c1b1f', '#6f6a73', '#f2edf7'),
+        dark: palette('#d0bcff', '#1c1b1f', '#e6e1e5', '#cac4cf', '#2b2930'),
+    },
+    matrix: {
+        light: palette('#10883a', '#f5fff7', '#102016', '#55735f', '#e8f8ec'),
+        dark: palette('#00ff66', '#030806', '#d8ffe4', '#6aff9b', '#07150d'),
+    },
+    monokai: {
+        light: palette('#7a8f00', '#f8f7ef', '#3b3a32', '#747065', '#efeee4'),
+        dark: palette('#a6e22e', '#272822', '#f8f8f2', '#cfcfc2', '#33342d'),
+    },
+    'night-owl': {
+        light: palette('#4876d9', '#fbfdff', '#25354a', '#60708a', '#eef6ff'),
+        dark: palette('#82aaff', '#011627', '#d6deeb', '#7fdbca', '#0b2942'),
+    },
+    nord: {
+        light: palette('#5e81ac', '#eceff4', '#2e3440', '#667085', '#e5e9f0'),
+        dark: palette('#88c0d0', '#2e3440', '#eceff4', '#d8dee9', '#3b4252'),
+    },
+}
+
+function palette(accent: string, background: string, foreground: string, hint: string, secondary: string): ThemePalette {
+    const isDark = relativeLuminance(background) < 0.5
+    return {
+        accent,
+        background,
+        foreground,
+        hint,
+        secondary,
+        dialog: isDark ? mix(background, '#ffffff', 0.05) : mix(background, '#000000', 0.015),
+        surface: isDark ? mix(background, '#ffffff', 0.09) : mix(background, '#000000', 0.035),
+        surfaceHover: isDark ? mix(background, '#ffffff', 0.14) : mix(background, '#000000', 0.065),
+        code: isDark ? mix(background, '#ffffff', 0.11) : mix(background, '#000000', 0.045),
+        border: withAlpha(isDark ? '#ffffff' : '#0f172a', isDark ? 0.11 : 0.10),
+        subtle: withAlpha(isDark ? '#ffffff' : '#0f172a', isDark ? 0.06 : 0.045),
+        buttonText: readableText(accent),
+    }
+}
+
+function isBrowser(): boolean {
+    return typeof window !== 'undefined' && typeof document !== 'undefined'
+}
+
+function safeGetItem(key: string): string | null {
+    if (!isBrowser()) return null
+    try {
+        return localStorage.getItem(key)
+    } catch {
+        return null
+    }
+}
+
+function safeSetItem(key: string, value: string): void {
+    if (!isBrowser()) return
+    try {
+        localStorage.setItem(key, value)
+    } catch {
+        // Ignore storage errors
+    }
+}
+
+function safeRemoveItem(key: string): void {
+    if (!isBrowser()) return
+    try {
+        localStorage.removeItem(key)
+    } catch {
+        // Ignore storage errors
+    }
+}
+
+export function parseColorTheme(raw: string | null): ColorThemePreset {
+    return COLOR_THEME_OPTIONS.some((option) => option.value === raw) ? raw as ColorThemePreset : 'default'
+}
+
+export function getStoredColorTheme(): ColorThemePreset {
+    return parseColorTheme(safeGetItem(COLOR_THEME_KEY))
+}
+
+export function getColorThemeOptions(): ReadonlyArray<ColorThemeOption> {
+    return COLOR_THEME_OPTIONS
+}
+
+export function getColorThemePreview(theme: ColorThemePreset): ColorThemeOption['preview'] {
+    return COLOR_THEME_OPTIONS.find((option) => option.value === theme)?.preview ?? COLOR_THEME_OPTIONS[0]!.preview
+}
+
+export function getColorThemeStorageKey(): string {
+    return COLOR_THEME_KEY
+}
+
+export function getColorThemeBackground(theme: ColorThemePreset, scheme: ColorScheme): string | null {
+    return theme === 'default' ? null : PALETTES[theme][toPaletteScheme(scheme)].background
+}
+
+export function getColorThemePickerValue(theme: ColorThemePreset, scheme: ColorScheme, id: ThemeColorKeyId): string | null {
+    if (theme === 'default') return null
+    const palette = PALETTES[theme][toPaletteScheme(scheme)]
+    const values: Record<ThemeColorKeyId, string> = {
+        background: palette.background,
+        surface: palette.secondary,
+        text: palette.foreground,
+        hint: palette.hint,
+        accent: palette.accent,
+        border: compositeOnBackground(palette.border, palette.background),
+        userBubble: palette.surface,
+    }
+    return values[id]
+}
+
+export function applyColorTheme(theme: ColorThemePreset = getStoredColorTheme(), scheme: ColorScheme): void {
+    if (!isBrowser()) return
+
+    const root = document.documentElement
+    root.setAttribute('data-color-theme', theme)
+
+    if (theme === 'default') {
+        removeThemeProperties(root)
+        return
+    }
+
+    const values = PALETTES[theme][toPaletteScheme(scheme)]
+    const properties: Record<string, string> = {
+        '--app-bg': values.background,
+        '--app-fg': values.foreground,
+        '--app-hint': values.hint,
+        '--app-link': values.accent,
+        '--app-button': values.accent,
+        '--app-button-text': values.buttonText,
+        '--app-banner-bg': values.accent,
+        '--app-banner-text': values.buttonText,
+        '--app-secondary-bg': values.secondary,
+        '--app-dialog-bg': values.dialog,
+        '--app-chat-user-bg': values.surface,
+        '--app-chat-user-fg': values.foreground,
+        '--app-chat-user-chip-bg': withAlpha(values.accent, toPaletteScheme(scheme) === 'dark' ? 0.24 : 0.15),
+        '--app-chat-user-chip-fg': values.accent,
+        '--app-tool-card-bg': values.surface,
+        '--app-tool-card-hover-bg': values.surfaceHover,
+        '--app-tool-card-accent': values.hint,
+        '--app-tool-card-muted-action-fg': withAlpha(values.hint, 0.72),
+        '--app-tool-card-subtitle': values.hint,
+        '--app-code-header-bg': values.surfaceHover,
+        '--app-code-header-fg': values.hint,
+        '--app-code-bg': values.code,
+        '--app-inline-code-bg': values.code,
+        '--app-inline-code-fg': values.foreground,
+        '--app-md-quote-bg': values.surface,
+        '--app-md-quote-border': withAlpha(values.accent, 0.35),
+        '--app-md-quote-fg': values.foreground,
+        '--app-md-table-bg': values.surface,
+        '--app-md-table-head-bg': values.surfaceHover,
+        '--app-reasoning-bg': values.surface,
+        '--app-border': values.border,
+        '--app-divider': values.border,
+        '--app-subtle-bg': values.subtle,
+        '--app-scrollbar-thumb': withAlpha(values.hint, 0.38),
+        '--app-scrollbar-thumb-hover': withAlpha(values.hint, 0.56),
+    }
+
+    for (const [key, value] of Object.entries(properties)) {
+        root.style.setProperty(key, value)
+    }
+}
+
+function removeThemeProperties(root: HTMLElement): void {
+    const properties = [
+        '--app-bg', '--app-fg', '--app-hint', '--app-link', '--app-button', '--app-button-text', '--app-banner-bg', '--app-banner-text',
+        '--app-secondary-bg', '--app-dialog-bg', '--app-chat-user-bg', '--app-chat-user-fg', '--app-chat-user-chip-bg',
+        '--app-chat-user-chip-fg', '--app-tool-card-bg', '--app-tool-card-hover-bg', '--app-tool-card-accent',
+        '--app-tool-card-muted-action-fg', '--app-tool-card-subtitle', '--app-code-header-bg', '--app-code-header-fg', '--app-code-bg',
+        '--app-inline-code-bg', '--app-inline-code-fg', '--app-md-quote-bg', '--app-md-quote-border', '--app-md-quote-fg', '--app-md-table-bg',
+        '--app-md-table-head-bg', '--app-reasoning-bg', '--app-border', '--app-divider', '--app-subtle-bg', '--app-scrollbar-thumb', '--app-scrollbar-thumb-hover',
+    ]
+    for (const property of properties) root.style.removeProperty(property)
+}
+
+
+function getDocumentColorScheme(): ColorScheme {
+    if (!isBrowser()) return 'light'
+    const theme = document.documentElement.getAttribute('data-theme')
+    return theme === 'dark' || theme === 'oled' ? theme : 'light'
+}
+
+function toPaletteScheme(scheme: ColorScheme): 'light' | 'dark' {
+    return scheme === 'light' ? 'light' : 'dark'
+}
+
+export function useColorTheme(): { colorTheme: ColorThemePreset; setColorTheme: (theme: ColorThemePreset) => void } {
+    const [colorTheme, setColorThemeState] = useState<ColorThemePreset>(getStoredColorTheme)
+
+    useEffect(() => {
+        if (!isBrowser()) return
+        const onStorage = (event: StorageEvent) => {
+            if (event.key !== COLOR_THEME_KEY) return
+            const nextTheme = parseColorTheme(event.newValue)
+            setColorThemeState(nextTheme)
+            applyColorTheme(nextTheme, getDocumentColorScheme())
+            window.dispatchEvent(new CustomEvent('hapi-color-theme-change', { detail: nextTheme }))
+        }
+        window.addEventListener('storage', onStorage)
+        return () => window.removeEventListener('storage', onStorage)
+    }, [])
+
+    const setColorTheme = useCallback((theme: ColorThemePreset) => {
+        setColorThemeState(theme)
+        applyColorTheme(theme, getDocumentColorScheme())
+        if (theme === 'default') {
+            safeRemoveItem(COLOR_THEME_KEY)
+        } else {
+            safeSetItem(COLOR_THEME_KEY, theme)
+        }
+        window.dispatchEvent(new CustomEvent('hapi-color-theme-change', { detail: theme }))
+    }, [])
+
+    return { colorTheme, setColorTheme }
+}
+
+function mix(a: string, b: string, weight: number): string {
+    const ca = parseHex(a)
+    const cb = parseHex(b)
+    const channel = (x: number, y: number) => Math.round(x * (1 - weight) + y * weight)
+    return toHex(channel(ca.r, cb.r), channel(ca.g, cb.g), channel(ca.b, cb.b))
+}
+
+function withAlpha(hex: string, alpha: number): string {
+    const color = parseHex(hex)
+    return `rgba(${color.r}, ${color.g}, ${color.b}, ${alpha})`
+}
+
+function compositeOnBackground(rgba: string, background: string): string {
+    const match = /^rgba\((\d+), (\d+), (\d+), ([\d.]+)\)$/.exec(rgba)
+    if (!match) return rgba
+    const base = parseHex(background)
+    const alpha = Number(match[4])
+    const blend = (foreground: number, behind: number) => Math.round(foreground * alpha + behind * (1 - alpha))
+    return toHex(blend(Number(match[1]), base.r), blend(Number(match[2]), base.g), blend(Number(match[3]), base.b))
+}
+
+function readableText(hex: string): string {
+    return relativeLuminance(hex) > 0.45 ? '#111827' : '#ffffff'
+}
+
+function relativeLuminance(hex: string): number {
+    const { r, g, b } = parseHex(hex)
+    const convert = (value: number) => {
+        const next = value / 255
+        return next <= 0.03928 ? next / 12.92 : ((next + 0.055) / 1.055) ** 2.4
+    }
+    return 0.2126 * convert(r) + 0.7152 * convert(g) + 0.0722 * convert(b)
+}
+
+function parseHex(hex: string): { r: number; g: number; b: number } {
+    const clean = hex.replace('#', '')
+    const value = clean.length === 3
+        ? clean.split('').map((char) => `${char}${char}`).join('')
+        : clean
+    return {
+        r: parseInt(value.slice(0, 2), 16),
+        g: parseInt(value.slice(2, 4), 16),
+        b: parseInt(value.slice(4, 6), 16),
+    }
+}
+
+function toHex(r: number, g: number, b: number): string {
+    return `#${[r, g, b].map((value) => value.toString(16).padStart(2, '0')).join('')}`
+}
diff --git a/web/src/hooks/useTheme.test.ts b/web/src/hooks/useTheme.test.ts
index 150b4baa..8a1699a9 100644
--- a/web/src/hooks/useTheme.test.ts
+++ b/web/src/hooks/useTheme.test.ts
@@ -26,6 +26,33 @@ describe('useTheme', () => {
         expect(meta?.hasAttribute('media')).toBe(false)
     })
 
+
+
+
+
+    it('clears the boot-time inline html background when runtime theme initializes', () => {
+        document.documentElement.style.backgroundColor = '#fbfbff'
+        localStorage.setItem('hapi-color-theme', 'one')
+
+        initializeTheme()
+
+        expect(document.documentElement.style.backgroundColor).toBe('')
+        expect(document.documentElement.style.getPropertyValue('--app-bg')).toBe('#fbfbff')
+    })
+
+    it('updates browser theme color after a cross-tab color theme change', () => {
+        localStorage.setItem('hapi-color-theme', 'one')
+        initializeTheme()
+        expect(document.querySelector<HTMLMetaElement>('meta[name="theme-color"]')?.content).toBe('#fbfbff')
+
+        localStorage.setItem('hapi-color-theme', 'notion')
+        act(() => {
+            window.dispatchEvent(new StorageEvent('storage', { key: 'hapi-color-theme', newValue: 'notion' }))
+        })
+
+        expect(document.querySelector<HTMLMetaElement>('meta[name="theme-color"]')?.content).toBe('#fafafa')
+    })
+
     it('updates the browser theme color when appearance changes', () => {
         const { result } = renderHook(() => useAppearance())
 
diff --git a/web/src/hooks/useTheme.ts b/web/src/hooks/useTheme.ts
index de619189..ba5e68cc 100644
--- a/web/src/hooks/useTheme.ts
+++ b/web/src/hooks/useTheme.ts
@@ -1,7 +1,6 @@
 import { useCallback, useEffect, useState, useSyncExternalStore } from 'react'
 import { getTelegramWebApp } from './useTelegram'
-
-type ColorScheme = 'light' | 'dark' | 'oled'
+import { applyColorTheme, getColorThemeBackground, getColorThemeStorageKey, getStoredColorTheme, type ColorScheme } from './useColorTheme'
 
 export type AppearancePreference = 'system' | 'dark' | 'light' | 'oled'
 
@@ -93,7 +92,7 @@ function applyBrowserThemeColor(scheme: ColorScheme): void {
         document.head.appendChild(meta)
     }
 
-    meta.content = THEME_COLORS[scheme]
+    meta.content = getColorThemeBackground(getStoredColorTheme(), scheme) ?? THEME_COLORS[scheme]
     meta.removeAttribute('media')
 }
 
@@ -102,7 +101,9 @@ export function getThemeColor(scheme: ColorScheme): string {
 }
 
 function applyTheme(scheme: ColorScheme): void {
+    document.documentElement.style.removeProperty('background-color')
     document.documentElement.setAttribute('data-theme', scheme)
+    applyColorTheme(getStoredColorTheme(), scheme)
     applyBrowserThemeColor(scheme)
 }
 
@@ -128,9 +129,9 @@ function getSnapshot(): ColorScheme {
     return currentScheme
 }
 
-function updateScheme(): void {
+function updateScheme(force = false): void {
     const newScheme = getColorScheme()
-    if (newScheme !== currentScheme) {
+    if (force || newScheme !== currentScheme) {
         currentScheme = newScheme
         applyTheme(newScheme)
         listeners.forEach((cb) => cb())
@@ -190,18 +191,20 @@ export function initializeTheme(): void {
         const tg = getTelegramWebApp()
         if (tg?.onEvent) {
             // Telegram theme changes
-            tg.onEvent('themeChanged', updateScheme)
+            tg.onEvent('themeChanged', () => updateScheme())
         } else if (typeof window !== 'undefined' && window.matchMedia) {
             // Browser system preference changes
             const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)')
-            mediaQuery.addEventListener('change', updateScheme)
+            mediaQuery.addEventListener('change', () => updateScheme())
         }
 
         // Cross-tab appearance sync: update theme when another tab changes localStorage
         if (typeof window !== 'undefined') {
             window.addEventListener('storage', (event: StorageEvent) => {
                 if (event.key === APPEARANCE_KEY) updateScheme()
+                if (event.key === getColorThemeStorageKey()) updateScheme(true)
             })
+            window.addEventListener('hapi-color-theme-change', () => updateScheme(true))
         }
     }
 }
diff --git a/web/src/hooks/useThemeColors.test.ts b/web/src/hooks/useThemeColors.test.ts
index 54931127..5ce0c508 100644
--- a/web/src/hooks/useThemeColors.test.ts
+++ b/web/src/hooks/useThemeColors.test.ts
@@ -78,6 +78,53 @@ describe('useThemeColors', () => {
         expect(localStorage.getItem('hapi-theme-colors')).toBeNull()
     })
 
+
+
+    it('preserves color theme preset variables when no custom colors are stored', () => {
+        localStorage.setItem('hapi-color-theme', 'one')
+        setScheme('light')
+
+        applyThemeColors()
+
+        expect(document.documentElement.style.getPropertyValue('--app-bg').trim()).toBe('#fbfbff')
+        expect(document.documentElement.style.getPropertyValue('--app-link').trim()).toBe('#526fff')
+    })
+
+    it('layers custom colors over color theme presets', () => {
+        localStorage.setItem('hapi-color-theme', 'one')
+        localStorage.setItem('hapi-theme-colors', JSON.stringify({ light: { background: '#123456' } }))
+        setScheme('light')
+
+        applyThemeColors()
+
+        expect(document.documentElement.style.getPropertyValue('--app-bg').trim()).toBe('#123456')
+        expect(document.documentElement.style.getPropertyValue('--app-link').trim()).toBe('#526fff')
+    })
+
+    it('uses the active color theme as the custom color picker baseline', () => {
+        localStorage.setItem('hapi-color-theme', 'one')
+        setScheme('light')
+        const { result } = renderHook(() => useThemeColors())
+
+        expect(result.current.getPickerValue('background')).toBe('#fbfbff')
+        expect(result.current.getPickerValue('accent')).toBe('#526fff')
+    })
+
+
+
+    it('reapplies color theme preset changes from cross-tab storage events without Settings mounted', () => {
+        localStorage.setItem('hapi-color-theme', 'one')
+        setScheme('light')
+        initializeThemeColors()
+        expect(document.documentElement.style.getPropertyValue('--app-bg').trim()).toBe('#fbfbff')
+
+        localStorage.setItem('hapi-color-theme', 'notion')
+        window.dispatchEvent(new StorageEvent('storage', { key: 'hapi-color-theme', newValue: 'notion' }))
+
+        expect(document.documentElement.style.getPropertyValue('--app-bg').trim()).toBe('#fafafa')
+        expect(document.documentElement.style.getPropertyValue('--app-link').trim()).toBe('#3183d8')
+    })
+
     it('reapplies stored colors for the active appearance during initialization', () => {
         localStorage.setItem('hapi-theme-colors', JSON.stringify({ oled: { background: '#0b0b0b' } }))
         setScheme('oled')
diff --git a/web/src/hooks/useThemeColors.ts b/web/src/hooks/useThemeColors.ts
index 826bc856..34f8be34 100644
--- a/web/src/hooks/useThemeColors.ts
+++ b/web/src/hooks/useThemeColors.ts
@@ -1,4 +1,5 @@
 import { useCallback, useEffect, useState } from 'react'
+import { applyColorTheme, getColorThemePickerValue, getColorThemeStorageKey, getStoredColorTheme, type ColorScheme } from './useColorTheme'
 
 /**
  * Per-appearance "key color" customization.
@@ -243,24 +244,24 @@ export function applyThemeColors(): void {
     if (!isBrowser()) return
 
     const scheme = getThemeScheme()
+    applyColorTheme(getStoredColorTheme(), scheme as ColorScheme)
+
     const overrides = getStoredThemeColors()[scheme] ?? {}
     const rootStyle = document.documentElement.style
 
     for (const key of THEME_COLOR_KEYS) {
         const override = overrides[key.id]
         const hex = override && isHexColor(override) ? override : null
+        if (!hex) continue
 
         for (const cssVar of key.targets) {
-            if (hex) rootStyle.setProperty(cssVar, hex)
-            else rootStyle.removeProperty(cssVar)
+            rootStyle.setProperty(cssVar, hex)
         }
 
-        if (key.derivedTargets) {
-            const derived = hex && key.derive ? key.derive(hex, scheme) : {}
+        if (key.derivedTargets && key.derive) {
+            const derived = key.derive(hex, scheme)
             for (const cssVar of key.derivedTargets) {
-                const value = derived[cssVar]
-                if (value) rootStyle.setProperty(cssVar, value)
-                else rootStyle.removeProperty(cssVar)
+                rootStyle.setProperty(cssVar, derived[cssVar]!)
             }
         }
     }
@@ -268,7 +269,7 @@ export function applyThemeColors(): void {
 
 export function getThemeColorPickerValue(scheme: ThemeScheme, id: ThemeColorKeyId): string {
     const override = getStoredThemeColors()[scheme]?.[id]
-    return override ?? DEFAULT_HEX[scheme][id]
+    return override ?? getColorThemePickerValue(getStoredColorTheme(), scheme, id) ?? DEFAULT_HEX[scheme][id]
 }
 
 export function initializeThemeColors(): void {
@@ -280,8 +281,9 @@ export function initializeThemeColors(): void {
     initialized = true
 
     window.addEventListener('storage', (event: StorageEvent) => {
-        if (event.key === STORAGE_KEY) applyThemeColors()
+        if (event.key === STORAGE_KEY || event.key === getColorThemeStorageKey()) applyThemeColors()
     })
+    window.addEventListener('hapi-color-theme-change', applyThemeColors)
 
     const themeObserver = new MutationObserver(() => {
         applyThemeColors()
@@ -323,13 +325,16 @@ export function useThemeColors(): {
         })
 
         const onStorage = (event: StorageEvent) => {
-            if (event.key === STORAGE_KEY) refresh()
+            if (event.key === STORAGE_KEY || event.key === getColorThemeStorageKey()) refresh()
         }
+        const onColorThemeChange = () => refresh()
         window.addEventListener('storage', onStorage)
+        window.addEventListener('hapi-color-theme-change', onColorThemeChange)
 
         return () => {
             themeObserver.disconnect()
             window.removeEventListener('storage', onStorage)
+            window.removeEventListener('hapi-color-theme-change', onColorThemeChange)
         }
     }, [])
 
@@ -374,7 +379,7 @@ export function useThemeColors(): {
     }, [])
 
     const getPickerValue = useCallback(
-        (id: ThemeColorKeyId) => overrides[id] ?? DEFAULT_HEX[scheme][id],
+        (id: ThemeColorKeyId) => overrides[id] ?? getColorThemePickerValue(getStoredColorTheme(), scheme, id) ?? DEFAULT_HEX[scheme][id],
         [overrides, scheme],
     )
 
diff --git a/web/src/lib/locales/en.ts b/web/src/lib/locales/en.ts
index 3b7c30a0..9a79e191 100644
--- a/web/src/lib/locales/en.ts
+++ b/web/src/lib/locales/en.ts
@@ -563,6 +563,24 @@ export default {
   'settings.display.appearance.dark': 'Dark',
   'settings.display.appearance.oled': 'OLED Black',
   'settings.display.appearance.light': 'Light',
+  'settings.display.colorTheme': 'Color theme',
+  'settings.display.colorTheme.default': 'Default',
+  'settings.display.colorTheme.notion': 'Notion',
+  'settings.display.colorTheme.one': 'One',
+  'settings.display.colorTheme.proof': 'Proof',
+  'settings.display.colorTheme.raycast': 'Raycast',
+  'settings.display.colorTheme.rosePine': 'Rose Pine',
+  'settings.display.colorTheme.solarized': 'Solarized',
+  'settings.display.colorTheme.vercel': 'Vercel',
+  'settings.display.colorTheme.vsCodePlus': 'VS Code Plus',
+  'settings.display.colorTheme.xcode': 'Xcode',
+  'settings.display.colorTheme.linear': 'Linear',
+  'settings.display.colorTheme.lobster': 'Lobster',
+  'settings.display.colorTheme.material': 'Material',
+  'settings.display.colorTheme.matrix': 'Matrix',
+  'settings.display.colorTheme.monokai': 'Monokai',
+  'settings.display.colorTheme.nightOwl': 'Night Owl',
+  'settings.display.colorTheme.nord': 'Nord',
   'settings.display.themeColors.title': 'Custom colors',
   'settings.display.themeColors.description': 'Applies to the current appearance. Switch appearance to customize each one separately.',
   'settings.display.themeColors.reset': 'Reset',
diff --git a/web/src/lib/locales/zh-CN.ts b/web/src/lib/locales/zh-CN.ts
index ef1cb15f..b25e9036 100644
--- a/web/src/lib/locales/zh-CN.ts
+++ b/web/src/lib/locales/zh-CN.ts
@@ -567,6 +567,24 @@ export default {
   'settings.display.appearance.dark': '深色',
   'settings.display.appearance.oled': 'OLED 纯黑',
   'settings.display.appearance.light': '浅色',
+  'settings.display.colorTheme': '颜色主题',
+  'settings.display.colorTheme.default': '默认',
+  'settings.display.colorTheme.notion': 'Notion',
+  'settings.display.colorTheme.one': 'One',
+  'settings.display.colorTheme.proof': 'Proof',
+  'settings.display.colorTheme.raycast': 'Raycast',
+  'settings.display.colorTheme.rosePine': 'Rose Pine',
+  'settings.display.colorTheme.solarized': 'Solarized',
+  'settings.display.colorTheme.vercel': 'Vercel',
+  'settings.display.colorTheme.vsCodePlus': 'VS Code Plus',
+  'settings.display.colorTheme.xcode': 'Xcode',
+  'settings.display.colorTheme.linear': 'Linear',
+  'settings.display.colorTheme.lobster': 'Lobster',
+  'settings.display.colorTheme.material': 'Material',
+  'settings.display.colorTheme.matrix': 'Matrix',
+  'settings.display.colorTheme.monokai': 'Monokai',
+  'settings.display.colorTheme.nightOwl': 'Night Owl',
+  'settings.display.colorTheme.nord': 'Nord',
   'settings.display.themeColors.title': '自定义配色',
   'settings.display.themeColors.description': '应用于当前外观。切换外观可分别自定义每种配色。',
   'settings.display.themeColors.reset': '重置',
diff --git a/web/src/routes/settings/display.tsx b/web/src/routes/settings/display.tsx
index ffc5c427..e6183c5e 100644
--- a/web/src/routes/settings/display.tsx
+++ b/web/src/routes/settings/display.tsx
@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react'
 import { useTranslation } from '@/lib/use-translation'
 import { getAppearanceOptions, useAppearance } from '@/hooks/useTheme'
+import { getColorThemeOptions, getColorThemePreview, useColorTheme, type ColorThemePreset } from '@/hooks/useColorTheme'
 import { getFontScaleOptions, useFontScale } from '@/hooks/useFontScale'
 import { getTerminalFontSizeOptions, useTerminalFontSize } from '@/hooks/useTerminalFontSize'
 import { getSessionListStatusModeOptions, useSessionListStatusMode } from '@/hooks/useSessionListStatusMode'
@@ -17,6 +18,46 @@ function PlusIcon() {
     return <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" className="h-4 w-4" aria-hidden="true"><path d="M12 5v14M5 12h14" /></svg>
 }
 
+function ColorThemePicker() {
+    const { t } = useTranslation()
+    const { colorTheme, setColorTheme } = useColorTheme()
+
+    return (
+        <fieldset className="px-3 py-3">
+            <legend className="mb-2 text-[var(--app-fg)]">{t('settings.display.colorTheme')}</legend>
+            <div role="radiogroup" aria-label={t('settings.display.colorTheme')} className="grid grid-cols-2 gap-2 sm:grid-cols-4">
+                {getColorThemeOptions().map((option) => (
+                    <ColorThemeOption
+                        key={option.value}
+                        theme={option.value}
+                        label={t(option.labelKey)}
+                        selected={colorTheme === option.value}
+                        onSelect={setColorTheme}
+                    />
+                ))}
+            </div>
+        </fieldset>
+    )
+}
+
+function ColorThemeOption(props: { theme: ColorThemePreset; label: string; selected: boolean; onSelect: (theme: ColorThemePreset) => void }) {
+    const preview = getColorThemePreview(props.theme)
+    return (
+        <label
+            className={`flex min-w-0 items-center gap-2 rounded-lg border px-2 py-2 text-left text-sm transition-colors ${props.selected
+                ? 'border-[var(--app-link)] bg-[var(--app-subtle-bg)] text-[var(--app-link)]'
+                : 'border-[var(--app-border)] text-[var(--app-fg)] hover:bg-[var(--app-subtle-bg)]'}`}
+        >
+            <input type="radio" name="color-theme" value={props.theme} checked={props.selected} onChange={() => props.onSelect(props.theme)} className="sr-only" />
+            <span className="relative h-7 w-7 shrink-0 overflow-hidden rounded-md border border-[var(--app-border)]" style={{ backgroundColor: preview.light }} aria-hidden="true">
+                <span className="absolute inset-y-0 right-0 w-1/2" style={{ backgroundColor: preview.dark }} />
+                <span className="absolute inset-x-1 bottom-1 h-1 rounded-full" style={{ backgroundColor: preview.accent }} />
+            </span>
+            <span className="min-w-0 truncate font-medium">{props.label}</span>
+        </label>
+    )
+}
+
 function SessionPreviewLimitControl() {
     const { t } = useTranslation()
     const { sessionPreviewLimit, setSessionPreviewLimit } = useSessionPreviewLimit()
@@ -105,6 +146,7 @@ export default function SettingsDisplayPage() {
                     options={getAppearanceOptions().map((option) => ({ value: option.value, label: t(option.labelKey) }))}
                     onChange={setAppearance}
                 />
+                <ColorThemePicker />
                 <ThemeColorControls />
             </SettingsSection>
 
diff --git a/web/src/routes/settings/index.test.tsx b/web/src/routes/settings/index.test.tsx
index e1698b67..ff66266f 100644
--- a/web/src/routes/settings/index.test.tsx
+++ b/web/src/routes/settings/index.test.tsx
@@ -10,15 +10,27 @@ import SettingsVoicePage from './voice'
 import SettingsVoiceVoicesPage from './voice-voices'
 import SettingsVoiceAdvancedPage from './voice-advanced'
 
-const { navigate, setAppearance, setFontScale, setTerminalFontSize, setComposerEnterBehavior, setVoice } = vi.hoisted(() => ({
+const { navigate, setAppearance, setColorTheme, setFontScale, setTerminalFontSize, setComposerEnterBehavior, setVoice } = vi.hoisted(() => ({
     navigate: vi.fn(),
     setAppearance: vi.fn(),
+    setColorTheme: vi.fn(),
     setFontScale: vi.fn(),
     setTerminalFontSize: vi.fn(),
     setComposerEnterBehavior: vi.fn(),
     setVoice: vi.fn(),
 }))
 
+vi.mock('@/hooks/useColorTheme', () => ({
+    useColorTheme: () => ({ colorTheme: 'default', setColorTheme }),
+    getColorThemeOptions: () => [
+        { value: 'default', labelKey: 'settings.display.colorTheme.default' },
+        { value: 'nord', labelKey: 'settings.display.colorTheme.nord' },
+    ],
+    getColorThemePreview: (theme: string) => theme === 'nord'
+        ? { light: '#eceff4', dark: '#2e3440', accent: '#88c0d0' }
+        : { light: '#ffffff', dark: '#1c1c1e', accent: '#111827' },
+}))
+
 vi.mock('@tanstack/react-router', () => ({
     useNavigate: () => navigate,
 }))
@@ -172,6 +184,8 @@ describe('responsive settings pages', () => {
     it('renders compact display controls without dropdown popovers', () => {
         renderPage(<SettingsDisplayPage />)
         expect(screen.getByRole('radio', { name: 'OLED Black' })).toBeInTheDocument()
+        fireEvent.click(screen.getByRole('radio', { name: 'Nord' }))
+        expect(setColorTheme).toHaveBeenCalledWith('nord')
         expect(screen.getByRole('radio', { name: '120%' })).toBeInTheDocument()
         expect(screen.getByRole('spinbutton', { name: 'Sessions Before Folding' })).toHaveValue(8)
         expect(screen.queryByRole('listbox')).not.toBeInTheDocument()