diff --git a/apps/admin/src/pages/SystemSettingsPage.tsx b/apps/admin/src/pages/SystemSettingsPage.tsx
index 6cc7672..63c1418 100644
--- a/apps/admin/src/pages/SystemSettingsPage.tsx
+++ b/apps/admin/src/pages/SystemSettingsPage.tsx
@@ -2,6 +2,27 @@ import { useState, useEffect } from 'react'
 import { API_BASE, type StoreSettings } from '@homaroma/types'
 import { Save, Loader2, Landmark, Truck } from 'lucide-react'
 
+const defaultThemeTokens = {
+  brandPrimary: '#FF6B6B',
+  brandPrimaryHover: '#FF4500',
+  brandAccent: '#FFF200',
+  brandWarm: '#FFA07A',
+  brandCool: '#E0FFFF',
+  brandSuccess: '#98FB98',
+  brandSoft: '#D8BFD8',
+  surfacePage: '#FFF0F5',
+  surfaceNavRest: '#F9F8F5',
+  surfaceCard: '#FFFFFF',
+  textMain: '#333333',
+  mutedText: '#666666',
+  linePrimary: '#00B900',
+  linePrimaryHover: '#009900',
+  fontBody: 'system-ui, sans-serif',
+  fontDisplay: 'system-ui, sans-serif',
+  shadowCard: '0 10px 25px rgba(0,0,0,0.05)',
+  shadowCardHover: '0 20px 40px rgba(0,0,0,0.1)',
+}
+
 export default function SystemSettingsPage() {
   const [loading, setLoading] = useState(true)
   const [saving, setSaving] = useState(false)
@@ -9,6 +30,7 @@ export default function SystemSettingsPage() {
   // Form State
   const [brandName, setBrandName] = useState('')
   const [logoUrl, setLogoUrl] = useState('')
+  const [themePreset, setThemePreset] = useState('default')
   const [shippingFee, setShippingFee] = useState<string>('')
   const [bankName, setBankName] = useState('')
   const [bankAccountName, setBankAccountName] = useState('')
@@ -26,6 +48,7 @@ export default function SystemSettingsPage() {
   
   const [footerSupportHeading, setFooterSupportHeading] = useState('')
   const [footerCopyrightText, setFooterCopyrightText] = useState('')
+  const [themeTokens, setThemeTokens] = useState<Record<string, string>>(defaultThemeTokens)
 
   useEffect(() => {
     fetch(`${API_BASE}/settings`)
@@ -33,6 +56,7 @@ export default function SystemSettingsPage() {
       .then((data: StoreSettings) => {
         setBrandName(data.brandName || 'HomAroma')
         setLogoUrl(data.logoUrl || '')
+        setThemePreset(data.themePreset || 'default')
         setShippingFee(data.shippingFee.toString())
         setBankName(data.bankName || '')
         setBankAccountName(data.bankAccountName || '')
@@ -48,6 +72,10 @@ export default function SystemSettingsPage() {
         setNewsletterButtonText(data.newsletterButtonText || '')
         setFooterSupportHeading(data.footerSupportHeading || '')
         setFooterCopyrightText(data.footerCopyrightText || '')
+        setThemeTokens({
+          ...defaultThemeTokens,
+          ...(data.themeTokens && typeof data.themeTokens === 'object' ? data.themeTokens : {}),
+        })
       })
       .catch(console.error)
       .finally(() => setLoading(false))
@@ -64,6 +92,8 @@ export default function SystemSettingsPage() {
         body: JSON.stringify({
           brandName,
           logoUrl,
+          themePreset,
+          themeTokens,
           shippingFee: parseFloat(shippingFee) || 0,
           bankName,
           bankAccountName,
@@ -244,6 +274,20 @@ export default function SystemSettingsPage() {
               )}
             </div>
 
+            <div className="space-y-2">
+              <label className="text-xs uppercase font-bold tracking-widest text-slate-400">Theme Preset</label>
+              <select
+                value={themePreset}
+                onChange={e => setThemePreset(e.target.value)}
+                className="admin-input w-full max-w-sm bg-slate-900 border-white/10"
+              >
+                <option value="default">Default</option>
+                <option value="warm">Warm</option>
+                <option value="minimal">Minimal</option>
+              </select>
+              <p className="text-[10px] text-slate-400">Theme preset helps websites choose a starting palette before custom tokens are applied.</p>
+            </div>
+
             <div className="space-y-2">
               <label className="text-xs uppercase font-bold tracking-widest text-slate-400">Footer Description</label>
               <textarea 
@@ -312,6 +356,59 @@ export default function SystemSettingsPage() {
           </div>
         </div>
 
+        {/* Theme Settings */}
+        <div className="admin-card p-8 space-y-6">
+          <div className="flex items-center gap-3 border-b border-white/10 pb-4">
+            <div className="p-2 bg-cyan-glow/10 rounded-lg">
+              <span className="text-xl">🎨</span>
+            </div>
+            <h2 className="text-lg font-bold uppercase tracking-widest text-white">Theme Tokens</h2>
+          </div>
+
+          <div className="grid gap-6 md:grid-cols-2">
+            {[
+              ['brandPrimary', 'Brand Primary'],
+              ['brandPrimaryHover', 'Brand Primary Hover'],
+              ['brandAccent', 'Brand Accent'],
+              ['surfacePage', 'Surface Page'],
+              ['surfaceCard', 'Surface Card'],
+              ['textMain', 'Text Main'],
+              ['mutedText', 'Muted Text'],
+              ['linePrimary', 'Line Primary'],
+              ['linePrimaryHover', 'Line Primary Hover'],
+            ].map(([key, label]) => (
+              <div key={key} className="space-y-2">
+                <label className="text-xs uppercase font-bold tracking-widest text-slate-400">{label}</label>
+                <input
+                  type="color"
+                  value={themeTokens[key] || ''}
+                  onChange={e => setThemeTokens((current) => ({ ...current, [key]: e.target.value }))}
+                  className="h-12 w-full max-w-sm rounded-xl border border-white/10 bg-slate-900 p-1"
+                />
+              </div>
+            ))}
+          </div>
+
+          <div className="grid gap-6 md:grid-cols-2">
+            {[
+              ['fontBody', 'Font Body'],
+              ['fontDisplay', 'Font Display'],
+              ['shadowCard', 'Shadow Card'],
+              ['shadowCardHover', 'Shadow Card Hover'],
+            ].map(([key, label]) => (
+              <div key={key} className="space-y-2">
+                <label className="text-xs uppercase font-bold tracking-widest text-slate-400">{label}</label>
+                <input
+                  type="text"
+                  value={themeTokens[key] || ''}
+                  onChange={e => setThemeTokens((current) => ({ ...current, [key]: e.target.value }))}
+                  className="admin-input w-full"
+                />
+              </div>
+            ))}
+          </div>
+        </div>
+
         {/* Newsletter Settings */}
         <div className="admin-card p-8 space-y-6">
           <div className="flex items-center gap-3 border-b border-white/10 pb-4">
diff --git a/apps/backend/prisma/migrations/20260622000000_add_theme_settings/migration.sql b/apps/backend/prisma/migrations/20260622000000_add_theme_settings/migration.sql
new file mode 100644
index 0000000..9684d82
--- /dev/null
+++ b/apps/backend/prisma/migrations/20260622000000_add_theme_settings/migration.sql
@@ -0,0 +1,6 @@
+-- Add theme support to singleton store settings.
+ALTER TABLE "StoreSettings"
+ADD COLUMN "themePreset" TEXT NOT NULL DEFAULT 'default';
+
+ALTER TABLE "StoreSettings"
+ADD COLUMN "themeTokens" JSONB;
diff --git a/apps/backend/prisma/schema.prisma b/apps/backend/prisma/schema.prisma
index 9450d6b..dce2c83 100644
--- a/apps/backend/prisma/schema.prisma
+++ b/apps/backend/prisma/schema.prisma
@@ -209,6 +209,8 @@ model StoreSettings {
   id                    Int                        @id @default(1)
   brandName             String                     @default("HomAroma")
   logoUrl               String?
+  themePreset           String                     @default("default")
+  themeTokens           Json?
   shippingFee           Float                      @default(35)
   bankName              String                     @default("KASIKORNBANK (KBANK)")
   bankAccountName       String                     @default("HomAroma Co., Ltd.")
diff --git a/apps/backend/src/routes/settings.ts b/apps/backend/src/routes/settings.ts
index cb6cb9f..ea8ea1f 100644
--- a/apps/backend/src/routes/settings.ts
+++ b/apps/backend/src/routes/settings.ts
@@ -46,6 +46,8 @@ export const settingsRoute = new Elysia({ prefix: "/settings" })
       bankAccountNumber: t.String(),
       pointsEarnRate: t.Number(),
       logoUrl: t.Optional(t.String()),
+      themePreset: t.Optional(t.String()),
+      themeTokens: t.Optional(t.Any()),
       facebookUrl: t.Optional(t.String()),
       instagramUrl: t.Optional(t.String()),
       tiktokUrl: t.Optional(t.String()),
diff --git a/apps/website/src/app/[lang]/layout.tsx b/apps/website/src/app/[lang]/layout.tsx
index d4bb9fb..235cfb3 100644
--- a/apps/website/src/app/[lang]/layout.tsx
+++ b/apps/website/src/app/[lang]/layout.tsx
@@ -8,6 +8,7 @@ import { API_BASE } from '@/lib/api';
 import type { MegaMenuPayload } from '@/components/navigation/menuTypes';
 import type { MenuItem, StoreSettings } from '@homaroma/types';
 import { isSupportedLocale } from '@/lib/locales';
+import type { CSSProperties } from 'react';
 
 export const metadata: Metadata = {
   title: 'HomAroma',
@@ -75,6 +76,41 @@ async function getStoreSettings(lang: string): Promise<StoreSettings | null> {
   }
 }
 
+function buildThemeStyle(settings: StoreSettings | null): CSSProperties | undefined {
+  const tokens = settings?.themeTokens
+  if (!tokens || typeof tokens !== 'object') return undefined
+
+  const style: Record<string, string> = {}
+  const vars: Array<[string, string | undefined]> = [
+    ['--color-brand-primary', tokens.brandPrimary],
+    ['--color-brand-primary-hover', tokens.brandPrimaryHover],
+    ['--color-brand-accent', tokens.brandAccent],
+    ['--color-brand-warm', tokens.brandWarm],
+    ['--color-brand-cool', tokens.brandCool],
+    ['--color-brand-success', tokens.brandSuccess],
+    ['--color-brand-soft', tokens.brandSoft],
+    ['--color-surface-page', tokens.surfacePage],
+    ['--color-surface-nav-rest', tokens.surfaceNavRest],
+    ['--color-surface-card', tokens.surfaceCard],
+    ['--color-text-main', tokens.textMain],
+    ['--color-muted-text', tokens.mutedText],
+    ['--color-line-primary', tokens.linePrimary],
+    ['--color-line-primary-hover', tokens.linePrimaryHover],
+    ['--font-body', tokens.fontBody],
+    ['--font-display', tokens.fontDisplay],
+    ['--shadow-card', tokens.shadowCard],
+    ['--shadow-card-hover', tokens.shadowCardHover],
+  ]
+
+  for (const [key, value] of vars) {
+    if (typeof value === 'string' && value.trim()) {
+      style[key] = value
+    }
+  }
+
+  return Object.keys(style).length > 0 ? (style as CSSProperties) : undefined
+}
+
 export default async function RootLayout({
   children,
   params,
@@ -95,9 +131,11 @@ export default async function RootLayout({
     getStoreSettings(lang),
   ]);
 
+  const themeStyle = buildThemeStyle(settings)
+
   return (
     <html lang={lang} className="scroll-smooth">
-      <body className="min-h-screen bg-surface-page text-text-main font-sans antialiased">
+      <body className="min-h-screen bg-surface-page text-text-main font-sans antialiased" style={themeStyle}>
         <ClientProviders>
           <Navbar categories={categories} initialMenu={initialMenu} settings={settings} />
           <main className="global-main">
diff --git a/packages/types/index.ts b/packages/types/index.ts
index 46a7b75..bf14697 100644
--- a/packages/types/index.ts
+++ b/packages/types/index.ts
@@ -121,6 +121,8 @@ export interface StoreSettings {
   id: number
   brandName: string
   logoUrl?: string | null
+  themePreset?: string | null
+  themeTokens?: Record<string, string> | null
   shippingFee: number
   bankName: string
   bankAccountName: string