diff --git a/.env.example b/.env.example
index 738916e..4309a7b 100644
--- a/.env.example
+++ b/.env.example
@@ -42,3 +42,6 @@ FRONTEND_URL=http://localhost:5174
 
 # Frontend (Vite — must be prefixed with VITE_)
 VITE_PANEL_URL=https://panel.corrosionmgmt.com
+
+# Hostnames that serve the marketing site (comma-separated); all other hosts get the panel
+VITE_MARKETING_HOSTS=corrosionmgmt.com,www.corrosionmgmt.com
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index a1ac312..bcc9535 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -14,9 +14,15 @@ declare module 'vue-router' {
 
 // ---------------------------------------------------------------------------
 // Domain detection — runs once at module load
+// Env-driven so www./staging hosts route correctly; an exact-match literal
+// here once meant any non-canonical marketing host silently got the panel.
 // ---------------------------------------------------------------------------
 const hostname = typeof window !== 'undefined' ? window.location.hostname : ''
-const isMarketingDomain = hostname === 'corrosionmgmt.com'
+const marketingHosts = (import.meta.env.VITE_MARKETING_HOSTS ?? 'corrosionmgmt.com,www.corrosionmgmt.com')
+  .split(',')
+  .map((h: string) => h.trim().toLowerCase())
+  .filter(Boolean)
+const isMarketingDomain = marketingHosts.includes(hostname.toLowerCase())
 
 // ---------------------------------------------------------------------------
 // Marketing page children — shared between both domain route sets