diff --git a/apps/spa/src/components/ThemeInjector.tsx b/apps/spa/src/components/ThemeInjector.tsx
index ef9256b..7793c40 100644
--- a/apps/spa/src/components/ThemeInjector.tsx
+++ b/apps/spa/src/components/ThemeInjector.tsx
@@ -1,9 +1,12 @@
 import { useEffect } from 'react'
+import { useTranslation } from 'react-i18next'
 import { API_BASE } from '@homaroma/types'
 
 export default function ThemeInjector() {
+  const { i18n } = useTranslation()
+
   useEffect(() => {
-    const lang = localStorage.getItem('app_lang') || 'en'
+    const lang = i18n.language || localStorage.getItem('app_lang') || 'en'
     
     fetch(`${API_BASE}/settings?lang=${lang}`)
       .then(res => res.ok ? res.json() : null)
@@ -11,6 +14,52 @@ export default function ThemeInjector() {
         if (!settings) return
         const root = document.documentElement
 
+        // --- Global SEO & Document Title ---
+        const pageTitle = settings.defaultSeoTitle || settings.brandName
+        if (pageTitle) {
+          document.title = pageTitle
+        }
+
+        if (settings.defaultSeoDescription) {
+          let metaDesc = document.querySelector('meta[name="description"]')
+          if (!metaDesc) {
+            metaDesc = document.createElement('meta')
+            metaDesc.setAttribute('name', 'description')
+            document.head.appendChild(metaDesc)
+          }
+          metaDesc.setAttribute('content', settings.defaultSeoDescription)
+        }
+
+        if (pageTitle) {
+          let ogTitle = document.querySelector('meta[property="og:title"]')
+          if (!ogTitle) {
+            ogTitle = document.createElement('meta')
+            ogTitle.setAttribute('property', 'og:title')
+            document.head.appendChild(ogTitle)
+          }
+          ogTitle.setAttribute('content', pageTitle)
+        }
+
+        if (settings.defaultSeoDescription) {
+          let ogDesc = document.querySelector('meta[property="og:description"]')
+          if (!ogDesc) {
+            ogDesc = document.createElement('meta')
+            ogDesc.setAttribute('property', 'og:description')
+            document.head.appendChild(ogDesc)
+          }
+          ogDesc.setAttribute('content', settings.defaultSeoDescription)
+        }
+
+        if (settings.defaultOgImage) {
+          let ogImg = document.querySelector('meta[property="og:image"]')
+          if (!ogImg) {
+            ogImg = document.createElement('meta')
+            ogImg.setAttribute('property', 'og:image')
+            document.head.appendChild(ogImg)
+          }
+          ogImg.setAttribute('content', settings.defaultOgImage)
+        }
+
         // --- Theme tokens ---
         const tokens = settings?.themeTokens
         if (tokens && typeof tokens === 'object') {
@@ -48,8 +97,8 @@ export default function ThemeInjector() {
         root.style.setProperty('--scroll-reveal-style', style)
         root.style.setProperty('--scroll-reveal-duration', `${duration}ms`)
       })
-      .catch(err => console.error('Failed to inject theme in SPA:', err))
-  }, [])
+      .catch(err => console.error('Failed to inject theme/SEO in SPA:', err))
+  }, [i18n.language])
 
   return null
 }
diff --git a/apps/website/src/app/[lang]/layout.tsx b/apps/website/src/app/[lang]/layout.tsx
index a4e74c3..e8029b2 100644
--- a/apps/website/src/app/[lang]/layout.tsx
+++ b/apps/website/src/app/[lang]/layout.tsx
@@ -12,20 +12,21 @@ import type { CSSProperties } from 'react';
 export async function generateMetadata({ params }: { params: Promise<{ lang: string }> }): Promise<Metadata> {
   const { lang } = await params;
   const settings = await getStoreSettings(lang);
-  const brandName = settings?.brandName || '';
+  const brandName = settings?.brandName || 'HomAroma';
+  const defaultTitle = settings?.defaultSeoTitle || brandName;
   const description = settings?.defaultSeoDescription || settings?.footerDescription || 'Pure Origins, Artisan Craft, Zero Compromise';
   const ogImage = settings?.defaultOgImage;
 
   return {
     title: {
       template: `%s | ${brandName}`,
-      default: brandName,
+      default: defaultTitle,
     },
     description,
     metadataBase: new URL(process.env.NEXT_PUBLIC_SITE_URL || 'http://localhost:3000'),
     openGraph: ogImage
       ? {
-          title: brandName,
+          title: defaultTitle,
           description,
           images: [ogImage],
         }
diff --git a/apps/website/src/app/[lang]/page.tsx b/apps/website/src/app/[lang]/page.tsx
index da2ef93..1c76299 100644
--- a/apps/website/src/app/[lang]/page.tsx
+++ b/apps/website/src/app/[lang]/page.tsx
@@ -15,10 +15,11 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
     getStoreSettings(lang),
   ])
 
-  const title = page?.seoTitle || page?.title || undefined
+  const title = page?.seoTitle || settings?.defaultSeoTitle || (page?.title && page.title !== 'Home' && page.title !== 'หน้าแรก' ? page.title : undefined) || settings?.brandName || undefined
   const description =
     page?.seoDescription ||
     settings?.defaultSeoDescription ||
+    settings?.footerDescription ||
     (settings?.brandName ? `${settings.brandName} - Pure Origins, Artisan Craft` : 'Pure Origins, Artisan Craft')
   const ogImage = page?.ogImageUrl || settings?.defaultOgImage
 
@@ -29,7 +30,7 @@ export async function generateMetadata({ params }: Props): Promise<Metadata> {
     lang,
     openGraph: ogImage
       ? {
-          title: page?.seoTitle || page?.title || settings?.brandName || undefined,
+          title,
           description,
           images: [ogImage],
         }