diff --git a/components/SupabaseConnectionTest.tsx b/components/SupabaseConnectionTest.tsx
index 559c5a1..70485ee 100644
--- a/components/SupabaseConnectionTest.tsx
+++ b/components/SupabaseConnectionTest.tsx
@@ -1,7 +1,7 @@
 'use client'
 
 import { useEffect, useState } from 'react'
-import { supabase } from '@/lib/supabase/client'
+import { supabase, isSupabaseConfigured } from '@/lib/supabase/client'
 
 export function SupabaseConnectionTest() {
   const [connectionStatus, setConnectionStatus] = useState<'testing' | 'connected' | 'error'>('testing')
@@ -9,9 +9,15 @@ export function SupabaseConnectionTest() {
 
   useEffect(() => {
     const testConnection = async () => {
+      if (!isSupabaseConfigured) {
+        setConnectionStatus('error')
+        setError('Supabase not configured')
+        return
+      }
+
       try {
         console.log('🔗 Testing Supabase connection...')
-        
+
         // Test basic connection
         const { data, error } = await supabase
           .from('profiles')
diff --git a/contexts/AuthContext.tsx b/contexts/AuthContext.tsx
index 5045e77..cde6284 100644
--- a/contexts/AuthContext.tsx
+++ b/contexts/AuthContext.tsx
@@ -2,6 +2,7 @@
 
 import { createContext, useContext, useEffect, useState, ReactNode } from 'react'
 import { authService } from '@/lib/auth/auth.service'
+import { isSupabaseConfigured } from '@/lib/supabase/client'
 import { AuthContextType, AuthUser, SignInCredentials, SignUpCredentials, UserProfile } from '@/lib/auth/auth.types'
 
 const AuthContext = createContext<AuthContextType | undefined>(undefined)
@@ -19,11 +20,15 @@ export function AuthProvider({ children }: AuthProviderProps) {
     // Check for existing session on mount
     checkUser()
 
-    // Listen for auth state changes
-    const { data: { subscription } } = authService.onAuthStateChange((authUser) => {
-      setUser(authUser)
-      setLoading(false)
-    })
+    // Listen for auth state changes when configured
+    let subscription: any
+    if (isSupabaseConfigured) {
+      const { data } = authService.onAuthStateChange((authUser) => {
+        setUser(authUser)
+        setLoading(false)
+      })
+      subscription = data?.subscription
+    }
 
     return () => {
       subscription?.unsubscribe()
diff --git a/lib/auth/auth.service.ts b/lib/auth/auth.service.ts
index 81c1057..2de9343 100644
--- a/lib/auth/auth.service.ts
+++ b/lib/auth/auth.service.ts
@@ -1,4 +1,4 @@
-import { supabase } from '@/lib/supabase/client'
+import { supabase, isSupabaseConfigured } from '@/lib/supabase/client'
 import { AuthUser, UserProfile, SignInCredentials, SignUpCredentials } from './auth.types'
 import { AuthError, User } from '@supabase/supabase-js'
 
@@ -7,11 +7,15 @@ class AuthService {
    * Transform Supabase user to our AuthUser type
    */
   private async transformUser(user: User): Promise<AuthUser> {
-    const { data: profile } = await supabase
-      .from('profiles')
-      .select('*')
-      .eq('id', user.id)
-      .single()
+    let profile: any = null
+    if (isSupabaseConfigured) {
+      const { data } = await supabase
+        .from('profiles')
+        .select('*')
+        .eq('id', user.id)
+        .single()
+      profile = data
+    }
 
     return {
       id: user.id,
@@ -33,6 +37,9 @@ class AuthService {
    * Get current user session
    */
   async getCurrentUser(): Promise<AuthUser | null> {
+    if (!isSupabaseConfigured) {
+      return null
+    }
     try {
       const { data: { user }, error } = await supabase.auth.getUser()
       
@@ -51,6 +58,9 @@ class AuthService {
    * Sign in with email and password
    */
   async signIn(credentials: SignInCredentials): Promise<AuthUser> {
+    if (!isSupabaseConfigured) {
+      throw new Error('Supabase not configured')
+    }
     try {
       const { data, error } = await supabase.auth.signInWithPassword({
         email: credentials.email,
@@ -76,6 +86,9 @@ class AuthService {
    * Sign up with email and password
    */
   async signUp(credentials: SignUpCredentials): Promise<AuthUser> {
+    if (!isSupabaseConfigured) {
+      throw new Error('Supabase not configured')
+    }
     try {
       const { data, error } = await supabase.auth.signUp({
         email: credentials.email,
@@ -106,6 +119,9 @@ class AuthService {
    * Sign out current user
    */
   async signOut(): Promise<void> {
+    if (!isSupabaseConfigured) {
+      throw new Error('Supabase not configured')
+    }
     try {
       const { error } = await supabase.auth.signOut()
       
@@ -122,6 +138,9 @@ class AuthService {
    * Reset password
    */
   async resetPassword(email: string): Promise<void> {
+    if (!isSupabaseConfigured) {
+      throw new Error('Supabase not configured')
+    }
     try {
       const { error } = await supabase.auth.resetPasswordForEmail(email, {
         redirectTo: `${window.location.origin}/auth/reset-password`
@@ -140,6 +159,9 @@ class AuthService {
    * Update user profile
    */
   async updateProfile(userId: string, updates: Partial<UserProfile>): Promise<UserProfile> {
+    if (!isSupabaseConfigured) {
+      throw new Error('Supabase not configured')
+    }
     try {
       const { data, error } = await supabase
         .from('profiles')
@@ -199,6 +221,9 @@ class AuthService {
    * Listen to auth state changes
    */
   onAuthStateChange(callback: (user: AuthUser | null) => void) {
+    if (!isSupabaseConfigured) {
+      return { data: null }
+    }
     return supabase.auth.onAuthStateChange(async (event, session) => {
       if (session?.user) {
         const authUser = await this.transformUser(session.user)
diff --git a/lib/services/blog.service.ts b/lib/services/blog.service.ts
index d44abfc..ab9ff3a 100644
--- a/lib/services/blog.service.ts
+++ b/lib/services/blog.service.ts
@@ -1,4 +1,4 @@
-import { supabase } from '@/lib/supabase/client'
+import { supabase, isSupabaseConfigured } from '@/lib/supabase/client'
 import { 
   BlogPost, 
   BlogCategory, 
@@ -81,6 +81,10 @@ export class BlogService {
 
   // Get posts with filtering and pagination
   async getPosts(params: BlogSearchParams = {}): Promise<BlogPaginatedResponse> {
+    if (!isSupabaseConfigured) {
+      console.warn('Supabase not configured: returning empty posts')
+      return { posts: [], total: 0, hasMore: false }
+    }
     const {
       status = 'published',
       category,
@@ -163,6 +167,10 @@ export class BlogService {
 
   // Get single post by slug
   async getPostBySlug(slug: string): Promise<BlogPost | null> {
+    if (!isSupabaseConfigured) {
+      console.warn('Supabase not configured: cannot fetch post')
+      return null
+    }
     const { data, error } = await supabase
       .from('blog_posts')
       .select(`
@@ -193,6 +201,10 @@ export class BlogService {
 
   // Get all categories
   async getCategories(): Promise<BlogCategory[]> {
+    if (!isSupabaseConfigured) {
+      console.warn('Supabase not configured: returning empty categories')
+      return []
+    }
     const { data, error } = await supabase
       .from('blog_categories')
       .select('*')
@@ -208,6 +220,10 @@ export class BlogService {
 
   // Search posts
   async searchPosts(query: string, limit = 10): Promise<BlogPost[]> {
+    if (!isSupabaseConfigured) {
+      console.warn('Supabase not configured: returning empty search results')
+      return []
+    }
     const { data, error } = await supabase
       .from('blog_posts')
       .select(`
@@ -254,6 +270,9 @@ export class BlogService {
   }
 
   async incrementViewCount(slug: string): Promise<void> {
+    if (!isSupabaseConfigured) {
+      return
+    }
     const { error } = await supabase.rpc('increment_view_count', { post_slug: slug })
     
     if (error) {
diff --git a/lib/supabase/client.ts b/lib/supabase/client.ts
index 3531385..f32331d 100644
--- a/lib/supabase/client.ts
+++ b/lib/supabase/client.ts
@@ -2,10 +2,16 @@ import { createClient } from '@supabase/supabase-js'
 import { createBrowserClient } from '@supabase/ssr'
 import { Database } from '@/lib/types/supabase.types'
 
-const supabaseUrl = process.env.NEXT_PUBLIC_SUPABASE_URL!
-const supabaseAnonKey = process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!
+const supabaseUrl =
+  process.env.NEXT_PUBLIC_SUPABASE_URL || 'https://example.supabase.co'
+const supabaseAnonKey =
+  process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY || 'public-anon-key'
 
-// Client-side Supabase client
+export const isSupabaseConfigured =
+  !!process.env.NEXT_PUBLIC_SUPABASE_URL &&
+  !!process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY
+
+// Client-side Supabase client (uses placeholder when not configured)
 export const supabase = createBrowserClient<Database>(
   supabaseUrl,
   supabaseAnonKey
@@ -13,5 +19,8 @@ export const supabase = createBrowserClient<Database>(
 
 // Server-side Supabase client (for API routes, etc.)
 export const createServerClient = () => {
-  return createClient<Database>(supabaseUrl, supabaseAnonKey)
-} 
\ No newline at end of file
+  if (!isSupabaseConfigured) {
+    throw new Error('Supabase environment variables are not configured')
+  }
+  return createClient<Database>(supabaseUrl!, supabaseAnonKey!)
+}