diff --git a/apps/hackathon/src/app/auth/login/page.tsx b/apps/hackathon/src/app/auth/login/page.tsx
index e7db94d..4d6bfdd 100644
--- a/apps/hackathon/src/app/auth/login/page.tsx
+++ b/apps/hackathon/src/app/auth/login/page.tsx
@@ -9,6 +9,7 @@ import { GithubOutlined } from '@ant-design/icons';
 import { useNavigate, Link } from 'react-router';
 import { toast } from 'sonner';
 import { Icon } from '@iconify/react';
+import { ThemeToggle } from '../../../components/theme-toggle';
 
 export default function LoginPage() {
   // console.log('[LoginPage] Rendering...');
@@ -114,28 +115,31 @@ export default function LoginPage() {
   };
 
   return (
-    <div className="flex justify-center items-center min-h-screen bg-gray-50 p-4">
-      <div className="bg-white w-full max-w-md p-8 rounded-2xl shadow-lg border border-gray-200">
-        <button
-          onClick={() => navigate('/')}
-          className="cursor-pointer text-primary-500 hover:text-primary-600 text-base font-sans flex items-center mb-6"
-        >
-          <Icon icon="ic:baseline-chevron-left" width="24" height="24" />
-          Back to Homepage
-        </button>
+    <div className="flex justify-center items-center min-h-screen bg-gray-50 dark:bg-neutral-950 p-4">
+      <div className="bg-white dark:bg-neutral-900 w-full max-w-md p-8 rounded-2xl shadow-lg border border-gray-200 dark:border-neutral-700">
+        <div className="flex items-center justify-between mb-6">
+          <button
+            onClick={() => navigate('/')}
+            className="cursor-pointer text-primary-500 hover:text-primary-600 dark:text-primary-400 dark:hover:text-primary-300 text-base font-sans flex items-center"
+          >
+            <Icon icon="ic:baseline-chevron-left" width="24" height="24" />
+            Back to Homepage
+          </button>
+          <ThemeToggle />
+        </div>
 
         <div className="text-center mb-8">
-          <h2 className="text-3xl font-bold text-gray-900 mb-2">
+          <h2 className="text-3xl font-bold text-gray-900 dark:text-white mb-2">
             Welcome Back
           </h2>
-          <p className="text-gray-600 font-sans">
+          <p className="text-gray-600 dark:text-neutral-400 font-sans">
             Sign in to join or create your hackathon team
           </p>
         </div>
 
         {error && (
-          <div className="mb-6 p-3 bg-red-50 border border-red-200 rounded-lg">
-            <p className="text-red-600 text-sm">{error}</p>
+          <div className="mb-6 p-3 bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-lg">
+            <p className="text-red-600 dark:text-red-400 text-sm">{error}</p>
           </div>
         )}
 
@@ -143,7 +147,7 @@ export default function LoginPage() {
           <div>
             <label
               htmlFor="email"
-              className="block text-sm font-medium text-gray-700 mb-1"
+              className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-1"
             >
               Email
             </label>
@@ -154,7 +158,7 @@ export default function LoginPage() {
               onChange={(e) => setEmail(e.target.value)}
               placeholder="your@email.com"
               disabled={isEmailLoading}
-              className="w-full px-4 py-2.5 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent disabled:bg-gray-100 disabled:cursor-not-allowed"
+              className="w-full px-4 py-2.5 border border-gray-300 dark:border-neutral-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500 disabled:bg-gray-100 dark:disabled:bg-neutral-700 disabled:cursor-not-allowed"
               required
             />
           </div>
@@ -163,13 +167,13 @@ export default function LoginPage() {
             <div className="flex items-center justify-between mb-1">
               <label
                 htmlFor="password"
-                className="block text-sm font-medium text-gray-700"
+                className="block text-sm font-medium text-gray-700 dark:text-neutral-300"
               >
                 Password
               </label>
               <Link
                 to="/auth/forgot-password"
-                className="text-sm text-primary-600 hover:text-primary-700"
+                className="text-sm text-primary-600 dark:text-primary-400 hover:text-primary-700 dark:hover:text-primary-300"
               >
                 Forgot password?
               </Link>
@@ -181,7 +185,7 @@ export default function LoginPage() {
               onChange={(e) => setPassword(e.target.value)}
               placeholder="••••••••"
               disabled={isEmailLoading}
-              className="w-full px-4 py-2.5 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent disabled:bg-gray-100 disabled:cursor-not-allowed"
+              className="w-full px-4 py-2.5 border border-gray-300 dark:border-neutral-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500 disabled:bg-gray-100 dark:disabled:bg-neutral-700 disabled:cursor-not-allowed"
               required
             />
           </div>
@@ -189,23 +193,23 @@ export default function LoginPage() {
           <button
             type="submit"
             disabled={isEmailLoading}
-            className="w-full py-3 bg-primary-600 text-white rounded-lg font-semibold hover:bg-primary-700 focus:outline-none focus:ring-2 focus:ring-primary-500 focus:ring-offset-2 disabled:bg-gray-400 disabled:cursor-not-allowed transition-colors cursor-pointer"
+            className="w-full py-3 bg-primary-600 text-white rounded-lg font-semibold hover:bg-primary-700 focus:outline-none focus:ring-2 focus:ring-primary-500 focus:ring-offset-2 dark:focus:ring-offset-neutral-900 disabled:bg-gray-400 dark:disabled:bg-neutral-600 disabled:cursor-not-allowed transition-colors cursor-pointer"
           >
             {isEmailLoading ? 'Signing in...' : 'Sign in with Email'}
           </button>
         </form>
 
         <div className="my-6 flex items-center">
-          <div className="flex-1 border-t border-gray-300"></div>
-          <span className="px-4 text-sm text-gray-500">OR</span>
-          <div className="flex-1 border-t border-gray-300"></div>
+          <div className="flex-1 border-t border-gray-300 dark:border-neutral-600"></div>
+          <span className="px-4 text-sm text-gray-500 dark:text-neutral-400">OR</span>
+          <div className="flex-1 border-t border-gray-300 dark:border-neutral-600"></div>
         </div>
 
         <button
           onClick={handleGithubLogin}
           disabled={isGithubLoading}
           type="button"
-          className="w-full py-3 flex items-center justify-center gap-2 bg-gray-100 border border-gray-300 rounded-lg font-semibold hover:bg-gray-200 focus:outline-none focus:ring-2 focus:ring-gray-400 focus:ring-offset-2 disabled:bg-gray-100 disabled:cursor-not-allowed transition-colors cursor-pointer"
+          className="w-full py-3 flex items-center justify-center gap-2 bg-gray-100 dark:bg-neutral-800 border border-gray-300 dark:border-neutral-600 rounded-lg font-semibold text-gray-900 dark:text-white hover:bg-gray-200 dark:hover:bg-neutral-700 focus:outline-none focus:ring-2 focus:ring-gray-400 focus:ring-offset-2 dark:focus:ring-offset-neutral-900 disabled:bg-gray-100 dark:disabled:bg-neutral-800 disabled:cursor-not-allowed transition-colors cursor-pointer"
         >
           <GithubOutlined className="text-xl" />
           <span>
@@ -214,11 +218,11 @@ export default function LoginPage() {
         </button>
 
         <div className="mt-6 text-center">
-          <p className="text-gray-600 text-sm">
+          <p className="text-gray-600 dark:text-neutral-400 text-sm">
             Don't have an account?{' '}
             <a
               href="/auth/signup"
-              className="text-primary-600 hover:text-primary-700 font-semibold"
+              className="text-primary-600 dark:text-primary-400 hover:text-primary-700 dark:hover:text-primary-300 font-semibold"
             >
               Sign up
             </a>
@@ -226,7 +230,7 @@ export default function LoginPage() {
         </div>
 
         <div className="mt-6 text-center">
-          <p className="text-gray-500 text-xs">
+          <p className="text-gray-500 dark:text-neutral-500 text-xs">
             By signing in, you agree to our Terms of Service and Privacy Policy
           </p>
         </div>
diff --git a/apps/hackathon/src/app/auth/signup/page.tsx b/apps/hackathon/src/app/auth/signup/page.tsx
index 7712acb..0b4bdc2 100644
--- a/apps/hackathon/src/app/auth/signup/page.tsx
+++ b/apps/hackathon/src/app/auth/signup/page.tsx
@@ -9,6 +9,7 @@ import { GithubOutlined } from '@ant-design/icons';
 import { useNavigate } from 'react-router';
 import { toast } from 'sonner';
 import { Icon } from '@iconify/react';
+import { ThemeToggle } from '../../../components/theme-toggle';
 
 export default function SignupPage() {
   const navigate = useNavigate();
@@ -137,26 +138,29 @@ export default function SignupPage() {
   };
 
   return (
-    <div className="flex justify-center items-center min-h-screen bg-gray-50 p-4">
-      <div className="bg-white w-full max-w-md p-8 rounded-2xl shadow-lg border border-gray-200">
-        <button
-          onClick={() => navigate('/')}
-          className="cursor-pointer text-primary-500 hover:text-primary-600 text-base font-sans flex items-center mb-6"
-        >
-          <Icon icon="ic:baseline-chevron-left" width="24" height="24" />
-          Back to Homepage
-        </button>
+    <div className="flex justify-center items-center min-h-screen bg-gray-50 dark:bg-neutral-950 p-4">
+      <div className="bg-white dark:bg-neutral-900 w-full max-w-md p-8 rounded-2xl shadow-lg border border-gray-200 dark:border-neutral-700">
+        <div className="flex items-center justify-between mb-6">
+          <button
+            onClick={() => navigate('/')}
+            className="cursor-pointer text-primary-500 hover:text-primary-600 dark:text-primary-400 dark:hover:text-primary-300 text-base font-sans flex items-center"
+          >
+            <Icon icon="ic:baseline-chevron-left" width="24" height="24" />
+            Back to Homepage
+          </button>
+          <ThemeToggle />
+        </div>
 
         <div className="text-center mb-8">
-          <h2 className="text-3xl font-bold text-gray-900 mb-2">
+          <h2 className="text-3xl font-bold text-gray-900 dark:text-white mb-2">
             Create Account
           </h2>
-          <p className="text-gray-600">Join the hackathon community</p>
+          <p className="text-gray-600 dark:text-neutral-400">Join the hackathon community</p>
         </div>
 
         {error && (
-          <div className="mb-6 p-3 bg-red-50 border border-red-200 rounded-lg">
-            <p className="text-red-600 text-sm">{error}</p>
+          <div className="mb-6 p-3 bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-lg">
+            <p className="text-red-600 dark:text-red-400 text-sm">{error}</p>
           </div>
         )}
 
@@ -164,7 +168,7 @@ export default function SignupPage() {
           <div>
             <label
               htmlFor="fullname"
-              className="block text-sm font-medium text-gray-700 mb-1"
+              className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-1"
             >
               Full Name
             </label>
@@ -175,7 +179,7 @@ export default function SignupPage() {
               onChange={(e) => setFullname(e.target.value)}
               placeholder="John Doe"
               disabled={isEmailLoading}
-              className="w-full px-4 py-2.5 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent disabled:bg-gray-100 disabled:cursor-not-allowed"
+              className="w-full px-4 py-2.5 border border-gray-300 dark:border-neutral-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500 disabled:bg-gray-100 dark:disabled:bg-neutral-700 disabled:cursor-not-allowed"
               required
             />
           </div>
@@ -183,7 +187,7 @@ export default function SignupPage() {
           <div>
             <label
               htmlFor="email"
-              className="block text-sm font-medium text-gray-700 mb-1"
+              className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-1"
             >
               Email
             </label>
@@ -194,7 +198,7 @@ export default function SignupPage() {
               onChange={(e) => setEmail(e.target.value)}
               placeholder="your@email.com"
               disabled={isEmailLoading}
-              className="w-full px-4 py-2.5 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent disabled:bg-gray-100 disabled:cursor-not-allowed"
+              className="w-full px-4 py-2.5 border border-gray-300 dark:border-neutral-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500 disabled:bg-gray-100 dark:disabled:bg-neutral-700 disabled:cursor-not-allowed"
               required
             />
           </div>
@@ -202,7 +206,7 @@ export default function SignupPage() {
           <div>
             <label
               htmlFor="password"
-              className="block text-sm font-medium text-gray-700 mb-1"
+              className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-1"
             >
               Password
             </label>
@@ -213,7 +217,7 @@ export default function SignupPage() {
               onChange={(e) => setPassword(e.target.value)}
               placeholder="••••••••"
               disabled={isEmailLoading}
-              className="w-full px-4 py-2.5 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent disabled:bg-gray-100 disabled:cursor-not-allowed"
+              className="w-full px-4 py-2.5 border border-gray-300 dark:border-neutral-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500 disabled:bg-gray-100 dark:disabled:bg-neutral-700 disabled:cursor-not-allowed"
               required
             />
           </div>
@@ -221,7 +225,7 @@ export default function SignupPage() {
           <div>
             <label
               htmlFor="confirmPassword"
-              className="block text-sm font-medium text-gray-700 mb-1"
+              className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-1"
             >
               Confirm Password
             </label>
@@ -232,7 +236,7 @@ export default function SignupPage() {
               onChange={(e) => setConfirmPassword(e.target.value)}
               placeholder="••••••••"
               disabled={isEmailLoading}
-              className="w-full px-4 py-2.5 border border-gray-300 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent disabled:bg-gray-100 disabled:cursor-not-allowed"
+              className="w-full px-4 py-2.5 border border-gray-300 dark:border-neutral-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-primary-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500 disabled:bg-gray-100 dark:disabled:bg-neutral-700 disabled:cursor-not-allowed"
               required
             />
           </div>
@@ -240,23 +244,23 @@ export default function SignupPage() {
           <button
             type="submit"
             disabled={isEmailLoading}
-            className="w-full py-3 bg-primary-600 text-white rounded-lg font-semibold hover:bg-primary-700 focus:outline-none focus:ring-2 focus:ring-primary-500 focus:ring-offset-2 disabled:bg-gray-400 disabled:cursor-not-allowed transition-colors cursor-pointer"
+            className="w-full py-3 bg-primary-600 text-white rounded-lg font-semibold hover:bg-primary-700 focus:outline-none focus:ring-2 focus:ring-primary-500 focus:ring-offset-2 dark:focus:ring-offset-neutral-900 disabled:bg-gray-400 dark:disabled:bg-neutral-600 disabled:cursor-not-allowed transition-colors cursor-pointer"
           >
             {isEmailLoading ? 'Creating account...' : 'Create Account'}
           </button>
         </form>
 
         <div className="my-6 flex items-center">
-          <div className="flex-1 border-t border-gray-300"></div>
-          <span className="px-4 text-sm text-gray-500">OR</span>
-          <div className="flex-1 border-t border-gray-300"></div>
+          <div className="flex-1 border-t border-gray-300 dark:border-neutral-600"></div>
+          <span className="px-4 text-sm text-gray-500 dark:text-neutral-400">OR</span>
+          <div className="flex-1 border-t border-gray-300 dark:border-neutral-600"></div>
         </div>
 
         <button
           onClick={handleGithubLogin}
           disabled={isGithubLoading}
           type="button"
-          className="w-full py-3 flex items-center justify-center gap-2 bg-gray-100 border border-gray-300 rounded-lg font-semibold hover:bg-gray-200 focus:outline-none focus:ring-2 focus:ring-gray-400 focus:ring-offset-2 disabled:bg-gray-100 disabled:cursor-not-allowed transition-colors cursor-pointer"
+          className="w-full py-3 flex items-center justify-center gap-2 bg-gray-100 dark:bg-neutral-800 border border-gray-300 dark:border-neutral-600 rounded-lg font-semibold text-gray-900 dark:text-white hover:bg-gray-200 dark:hover:bg-neutral-700 focus:outline-none focus:ring-2 focus:ring-gray-400 focus:ring-offset-2 dark:focus:ring-offset-neutral-900 disabled:bg-gray-100 dark:disabled:bg-neutral-800 disabled:cursor-not-allowed transition-colors cursor-pointer"
         >
           <GithubOutlined className="text-xl" />
           <span>
@@ -265,11 +269,11 @@ export default function SignupPage() {
         </button>
 
         <div className="mt-6 text-center">
-          <p className="text-gray-600 text-sm">
+          <p className="text-gray-600 dark:text-neutral-400 text-sm">
             Already have an account?{' '}
             <a
               href="/auth/login"
-              className="text-primary-600 hover:text-primary-700 font-semibold"
+              className="text-primary-600 dark:text-primary-400 hover:text-primary-700 dark:hover:text-primary-300 font-semibold"
             >
               Sign in
             </a>
@@ -277,7 +281,7 @@ export default function SignupPage() {
         </div>
 
         <div className="mt-6 text-center">
-          <p className="text-gray-500 text-xs">
+          <p className="text-gray-500 dark:text-neutral-500 text-xs">
             By signing up, you agree to our Terms of Service and Privacy Policy
           </p>
         </div>
diff --git a/apps/hackathon/src/app/dashboard/layout.tsx b/apps/hackathon/src/app/dashboard/layout.tsx
index 057050a..f8f3525 100644
--- a/apps/hackathon/src/app/dashboard/layout.tsx
+++ b/apps/hackathon/src/app/dashboard/layout.tsx
@@ -6,21 +6,21 @@ const DashboardLayout: FC = (): ReactElement => {
   const [sidebarOpen, setSidebarOpen] = useState(false);
 
   return (
-    <div className="flex min-h-screen bg-gray-50">
+    <div className="flex min-h-screen bg-gray-50 dark:bg-neutral-950">
       <Sidebar isOpen={sidebarOpen} onClose={() => setSidebarOpen(false)} />
 
       <div className="flex-1 flex flex-col overflow-auto">
         {/* Mobile Header with Hamburger */}
-        <div className="lg:hidden bg-white border-b px-4 py-3 flex items-center">
+        <div className="lg:hidden bg-white dark:bg-neutral-900 border-b dark:border-neutral-700 px-4 py-3 flex items-center">
           <button
             onClick={() => setSidebarOpen(true)}
-            className="p-2 rounded-lg hover:bg-gray-100 transition-colors"
+            className="p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-neutral-800 transition-colors"
           >
-            <svg className="w-6 h-6 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <svg className="w-6 h-6 text-gray-600 dark:text-neutral-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
             </svg>
           </button>
-          <h1 className="ml-3 text-lg font-bold text-gray-900">🏆 Hackathon</h1>
+          <h1 className="ml-3 text-lg font-bold text-gray-900 dark:text-white">Hackathon</h1>
         </div>
 
         <main className="flex-1 overflow-auto">
diff --git a/apps/hackathon/src/app/dashboard/page.tsx b/apps/hackathon/src/app/dashboard/page.tsx
index 85d9edd..dfea38d 100644
--- a/apps/hackathon/src/app/dashboard/page.tsx
+++ b/apps/hackathon/src/app/dashboard/page.tsx
@@ -42,25 +42,25 @@ const DashboardPage: FC = (): ReactElement => {
   return (
     <div className="p-8">
       <div className="mb-8">
-        <h1 className="text-3xl font-bold text-gray-900">
+        <h1 className="text-3xl font-bold text-gray-900 dark:text-white">
           Welcome, {user?.fullname || user?.email?.split('@')[0] || 'User'}!
         </h1>
         {user?.location && (
-          <p className="text-gray-600 mt-1">Location: {user.location}</p>
+          <p className="text-gray-600 dark:text-neutral-400 mt-1">Location: {user.location}</p>
         )}
       </div>
 
       {invitations.length > 0 && (
-        <div className="mb-8 bg-blue-50 border border-blue-200 rounded-lg p-6">
-          <h2 className="text-xl font-bold text-gray-900 mb-4">
+        <div className="mb-8 bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 rounded-lg p-6">
+          <h2 className="text-xl font-bold text-gray-900 dark:text-white mb-4">
             Team Invitations ({invitations.length})
           </h2>
           <div className="space-y-3">
             {invitations.map((invitation) => (
-              <div key={invitation.id} className="bg-white p-4 rounded-lg shadow-sm flex items-center justify-between">
+              <div key={invitation.id} className="bg-white dark:bg-neutral-800 p-4 rounded-lg shadow-sm flex items-center justify-between">
                 <div>
-                  <p className="font-medium text-gray-900">{invitation.team.name}</p>
-                  <p className="text-sm text-gray-600">Invited by {invitation.inviter.fullname}</p>
+                  <p className="font-medium text-gray-900 dark:text-white">{invitation.team.name}</p>
+                  <p className="text-sm text-gray-600 dark:text-neutral-400">Invited by {invitation.inviter.fullname}</p>
                 </div>
                 <div className="flex space-x-2">
                   <Button size="sm" onClick={() => handleAcceptInvitation(invitation.id)}>Accept</Button>
@@ -74,53 +74,53 @@ const DashboardPage: FC = (): ReactElement => {
 
       {myTeams.length > 0 ? (
         <div className="mb-6 md:mb-8">
-          <h2 className="text-xl md:text-2xl font-bold text-gray-900 mb-3 md:mb-4">My Team</h2>
+          <h2 className="text-xl md:text-2xl font-bold text-gray-900 dark:text-white mb-3 md:mb-4">My Team</h2>
           <div className="grid gap-4 md:gap-6 md:grid-cols-2 lg:grid-cols-3">
             {myTeams.map((team) => (
-              <Link key={team.id} to={'/teams/' + team.id} className="bg-white rounded-lg shadow-md overflow-hidden hover:shadow-lg transition-shadow">
+              <Link key={team.id} to={'/teams/' + team.id} className="bg-white dark:bg-neutral-800 rounded-lg shadow-md overflow-hidden hover:shadow-lg transition-shadow">
                 {team.banner && <img src={team.banner} alt={team.name} className="w-full h-32 object-cover" />}
                 <div className="p-4 md:p-6">
                   <div className="flex items-center space-x-3 mb-2 md:mb-3">
                     {team.logo && <img src={team.logo} alt={team.name} className="w-10 h-10 md:w-12 md:h-12 rounded-full object-cover" />}
                     <div>
-                      <h3 className="text-base md:text-lg font-bold text-gray-900">{team.name}</h3>
-                      <p className="text-xs md:text-sm text-gray-600">City: {team.city}</p>
+                      <h3 className="text-base md:text-lg font-bold text-gray-900 dark:text-white">{team.name}</h3>
+                      <p className="text-xs md:text-sm text-gray-600 dark:text-neutral-400">City: {team.city}</p>
                     </div>
                   </div>
-                  <p className="text-gray-600 text-xs md:text-sm line-clamp-2">{team.description}</p>
+                  <p className="text-gray-600 dark:text-neutral-400 text-xs md:text-sm line-clamp-2">{team.description}</p>
                 </div>
               </Link>
             ))}
           </div>
         </div>
       ) : (
-        <div className="mb-6 md:mb-8 bg-white rounded-lg shadow-md p-6 md:p-8">
+        <div className="mb-6 md:mb-8 bg-white dark:bg-neutral-800 rounded-lg shadow-md p-6 md:p-8">
           <div className="text-center">
             <div className="text-3xl md:text-4xl mb-2 md:mb-3">👋</div>
-            <h2 className="text-xl md:text-2xl font-bold text-gray-900 mb-1 md:mb-2">You are not in a team yet</h2>
-            <p className="text-sm md:text-base text-gray-600">Use the sidebar to browse teams or create your own</p>
+            <h2 className="text-xl md:text-2xl font-bold text-gray-900 dark:text-white mb-1 md:mb-2">You are not in a team yet</h2>
+            <p className="text-sm md:text-base text-gray-600 dark:text-neutral-400">Use the sidebar to browse teams or create your own</p>
           </div>
         </div>
       )}
 
-      <div className="mt-8 bg-gradient-to-br from-blue-50 to-indigo-50 rounded-xl shadow-lg">
+      <div className="mt-8 bg-gradient-to-br from-blue-50 to-indigo-50 dark:from-neutral-800 dark:to-neutral-900 rounded-xl shadow-lg">
         <div className="bg-gradient-to-r from-blue-600 to-indigo-600 h-24 rounded-t-xl"></div>
         <div className="px-4 md:px-8 pb-4 md:pb-8">
           <div className="flex flex-col md:flex-row md:items-start -mt-12 mb-4 md:mb-6">
             <div className="flex flex-col md:flex-row items-start">
               {user?.avatar ? (
-                <img src={user.avatar} alt={user.fullname || 'User'} className="w-20 h-20 md:w-24 md:h-24 rounded-full border-4 border-white shadow-lg object-cover" />
+                <img src={user.avatar} alt={user.fullname || 'User'} className="w-20 h-20 md:w-24 md:h-24 rounded-full border-4 border-white dark:border-neutral-700 shadow-lg object-cover" />
               ) : (
-                <div className="w-20 h-20 md:w-24 md:h-24 rounded-full border-4 border-white shadow-lg bg-gray-200 flex items-center justify-center">
-                  <span className="text-gray-400 text-3xl md:text-4xl">User</span>
+                <div className="w-20 h-20 md:w-24 md:h-24 rounded-full border-4 border-white dark:border-neutral-700 shadow-lg bg-gray-200 dark:bg-neutral-700 flex items-center justify-center">
+                  <span className="text-gray-400 dark:text-neutral-500 text-3xl md:text-4xl">User</span>
                 </div>
               )}
               <div className="md:ml-6 mt-4 md:mt-14">
-                <h2 className="text-xl md:text-2xl font-bold text-gray-900">{user?.fullname || user?.email?.split('@')[0] || 'Unnamed User'}</h2>
+                <h2 className="text-xl md:text-2xl font-bold text-gray-900 dark:text-white">{user?.fullname || user?.email?.split('@')[0] || 'Unnamed User'}</h2>
                 {user?.location ? (
-                  <p className="text-gray-600 flex items-center mt-1 text-sm md:text-base">{user.location}</p>
+                  <p className="text-gray-600 dark:text-neutral-400 flex items-center mt-1 text-sm md:text-base">{user.location}</p>
                 ) : (
-                  <Link to="/onboarding/user" className="text-blue-600 hover:text-blue-700 text-xs md:text-sm mt-1 inline-block">Complete your profile</Link>
+                  <Link to="/onboarding/user" className="text-blue-600 dark:text-blue-400 hover:text-blue-700 dark:hover:text-blue-300 text-xs md:text-sm mt-1 inline-block">Complete your profile</Link>
                 )}
               </div>
             </div>
@@ -130,20 +130,20 @@ const DashboardPage: FC = (): ReactElement => {
           </div>
           <div className="space-y-4 md:space-y-6">
             {user?.bio && (
-              <div className="bg-white rounded-lg p-4 shadow-sm">
-                <h3 className="text-sm font-semibold text-gray-700 uppercase tracking-wide mb-2">About</h3>
-                <p className="text-gray-800 leading-relaxed">{user.bio}</p>
+              <div className="bg-white dark:bg-neutral-800 rounded-lg p-4 shadow-sm">
+                <h3 className="text-sm font-semibold text-gray-700 dark:text-neutral-300 uppercase tracking-wide mb-2">About</h3>
+                <p className="text-gray-800 dark:text-neutral-200 leading-relaxed">{user.bio}</p>
               </div>
             )}
-            <div className="bg-white rounded-lg p-4 shadow-sm">
-              <h3 className="text-sm font-semibold text-gray-700 uppercase tracking-wide mb-3">Contact</h3>
-              <div className="flex items-center text-gray-700">
-                <span className="text-gray-900">{user?.email}</span>
+            <div className="bg-white dark:bg-neutral-800 rounded-lg p-4 shadow-sm">
+              <h3 className="text-sm font-semibold text-gray-700 dark:text-neutral-300 uppercase tracking-wide mb-3">Contact</h3>
+              <div className="flex items-center text-gray-700 dark:text-neutral-300">
+                <span className="text-gray-900 dark:text-white">{user?.email}</span>
               </div>
             </div>
             {user?.skills && user.skills.length > 0 && (
-              <div className="bg-white rounded-lg p-4 shadow-sm">
-                <h3 className="text-sm font-semibold text-gray-700 uppercase tracking-wide mb-3">Skills</h3>
+              <div className="bg-white dark:bg-neutral-800 rounded-lg p-4 shadow-sm">
+                <h3 className="text-sm font-semibold text-gray-700 dark:text-neutral-300 uppercase tracking-wide mb-3">Skills</h3>
                 <div className="flex flex-wrap gap-3">
                   {user.skills.map((skill: string) => (
                     <span key={skill} className="inline-flex items-center px-4 py-2 bg-blue-600 text-white rounded-lg text-sm font-medium shadow-sm hover:bg-blue-700 transition-colors">{skill}</span>
diff --git a/apps/hackathon/src/app/layout.tsx b/apps/hackathon/src/app/layout.tsx
index cbd1151..24da90e 100644
--- a/apps/hackathon/src/app/layout.tsx
+++ b/apps/hackathon/src/app/layout.tsx
@@ -107,10 +107,10 @@ export default function RootLayout() {
   // Show loading state while checking auth
   if (isChecking) {
     return (
-      <div className="flex justify-center items-center min-h-screen bg-gray-50">
+      <div className="flex justify-center items-center min-h-screen bg-gray-50 dark:bg-neutral-950">
         <div className="text-center">
           <div className="inline-block animate-spin rounded-full h-12 w-12 border-b-2 border-primary-600 mb-4"></div>
-          <p className="text-gray-600">Loading...</p>
+          <p className="text-gray-600 dark:text-neutral-400">Loading...</p>
         </div>
       </div>
     );
diff --git a/apps/hackathon/src/app/page.tsx b/apps/hackathon/src/app/page.tsx
index 0199742..8ca9255 100644
--- a/apps/hackathon/src/app/page.tsx
+++ b/apps/hackathon/src/app/page.tsx
@@ -2,6 +2,7 @@ import { useNavigate } from 'react-router';
 import { useState } from 'react';
 import { Button } from '@imphnen-frontend-service/ui/atoms';
 import { Icon } from '@iconify/react';
+import { ThemeToggle } from '../components/theme-toggle';
 
 export default function HomePage() {
   const navigate = useNavigate();
@@ -62,13 +63,13 @@ export default function HomePage() {
   ];
 
   return (
-    <div className="min-h-screen bg-white">
+    <div className="min-h-screen bg-white dark:bg-neutral-950">
       {/* Navigation */}
       <div id="#top" className="hidden"></div>
-      <nav className="border-b border-gray-200 bg-white sticky top-0 z-50">
+      <nav className="border-b border-gray-200 dark:border-neutral-800 bg-white dark:bg-neutral-900 sticky top-0 z-50">
         <div className="flex items-center justify-between max-w-7xl mx-auto px-4 md:px-8 py-4">
           <div className="flex items-center gap-2">
-            <span className="text-lg md:text-xl font-bold">IMPHNEN</span>
+            <span className="text-lg md:text-xl font-bold dark:text-white">IMPHNEN</span>
             <a
               href="#top"
               className="text-lg md:text-xl font-bold text-primary-500 hover:cursor-pointer"
@@ -80,22 +81,23 @@ export default function HomePage() {
           <div className="hidden md:flex text-label1 items-center gap-4 lg:gap-8">
             <a
               href="#timeline"
-              className="text-gray-600 hover:text-gray-900 transition-colors"
+              className="text-gray-600 dark:text-neutral-400 hover:text-gray-900 dark:hover:text-white transition-colors"
             >
               Timeline
             </a>
             <a
               href="#hadiah"
-              className="text-gray-600 hover:text-gray-900 transition-colors"
+              className="text-gray-600 dark:text-neutral-400 hover:text-gray-900 dark:hover:text-white transition-colors"
             >
               Hadiah
             </a>
             <a
               href="#faq"
-              className="text-gray-600 hover:text-gray-900 transition-colors"
+              className="text-gray-600 dark:text-neutral-400 hover:text-gray-900 dark:hover:text-white transition-colors"
             >
               FAQ
             </a>
+            <ThemeToggle />
             <Button
               onClick={() => navigate('/auth/login')}
               size="sm"
@@ -113,47 +115,50 @@ export default function HomePage() {
             </Button>
           </div>
           {/* Mobile Menu Button */}
-          <button
-            onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
-            className="md:hidden p-2 cursor-pointer"
-          >
-            <svg
-              className="w-6 h-6"
-              fill="none"
-              stroke="currentColor"
-              viewBox="0 0 24 24"
+          <div className="flex items-center gap-2 md:hidden">
+            <ThemeToggle />
+            <button
+              onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
+              className="p-2 cursor-pointer text-gray-900 dark:text-white"
             >
-              <path
-                strokeLinecap="round"
-                strokeLinejoin="round"
-                strokeWidth={2}
-                d="M4 6h16M4 12h16M4 18h16"
-              />
-            </svg>
-          </button>
+              <svg
+                className="w-6 h-6"
+                fill="none"
+                stroke="currentColor"
+                viewBox="0 0 24 24"
+              >
+                <path
+                  strokeLinecap="round"
+                  strokeLinejoin="round"
+                  strokeWidth={2}
+                  d="M4 6h16M4 12h16M4 18h16"
+                />
+              </svg>
+            </button>
+          </div>
         </div>
       </nav>
 
       {/* Mobile Menu */}
       {mobileMenuOpen && (
-        <div className="md:hidden border-b border-gray-200 bg-white">
+        <div className="md:hidden border-b border-gray-200 dark:border-neutral-800 bg-white dark:bg-neutral-900">
           <div className="flex flex-col items-start gap-4 px-4 py-4">
             <a
               href="#timeline"
-              className="ms-3 text-gray-600 hover:text-gray-900"
+              className="ms-3 text-gray-600 dark:text-neutral-400 hover:text-gray-900 dark:hover:text-white"
             >
               Timeline
             </a>
             <a
               href="#hadiah"
-              className="ms-3 text-gray-600 hover:text-gray-900"
+              className="ms-3 text-gray-600 dark:text-neutral-400 hover:text-gray-900 dark:hover:text-white"
             >
               Hadiah
             </a>
-            <a href="#faq" className="ms-3 text-gray-600 hover:text-gray-900">
+            <a href="#faq" className="ms-3 text-gray-600 dark:text-neutral-400 hover:text-gray-900 dark:hover:text-white">
               FAQ
             </a>
-            <a href="#masuk" className="ms-3 text-gray-600 hover:text-gray-900">
+            <a href="#masuk" className="ms-3 text-gray-600 dark:text-neutral-400 hover:text-gray-900 dark:hover:text-white">
               Masuk
             </a>
             <button
@@ -177,7 +182,7 @@ export default function HomePage() {
             className="absolute bottom-1/3 -right-20 w-100 h-100 rounded-full bg-linear-to-r from-blue-400/20 to-primary/20 blur-3xl"
             style={{ transform: 'translate(0px, 0px)', opacity: 1 }}
           ></div>
-          <div className="absolute inset-0 bg-[linear-gradient(rgba(59,130,246,0.05)_1px,transparent_1px),linear-gradient(to_right,rgba(59,130,246,0.05)_1px,transparent_1px)] bg-size-[40px_40px]"></div>
+          <div className="absolute inset-0 bg-[linear-gradient(rgba(59,130,246,0.05)_1px,transparent_1px),linear-gradient(to_right,rgba(59,130,246,0.05)_1px,transparent_1px)] dark:bg-[linear-gradient(rgba(59,130,246,0.1)_1px,transparent_1px),linear-gradient(to_right,rgba(59,130,246,0.1)_1px,transparent_1px)] bg-size-[40px_40px]"></div>
         </div>
         <div className="mx-auto container px-4 relative flex flex-col items-center">
           {/* Logos */}
@@ -189,19 +194,19 @@ export default function HomePage() {
                 className="h-12 md:h-16"
               />
             </div>
-            <span className="text-3xl md:text-5xl font-bold text-gray-400">
+            <span className="text-3xl md:text-5xl font-bold text-gray-400 dark:text-neutral-500">
               ×
             </span>
             <div className="flex items-center">
               <img
                 src="images/sponsors/kolosal-logo_rlxbck.svg"
                 alt="Kolosal.ai"
-                className="h-8 md:h-12"
+                className="h-8 md:h-12 dark:invert"
               />
             </div>
           </div>
           {/* Title */}
-          <h1 className="text-h1 font-bold text-gray-900 mb-4 text-center">
+          <h1 className="text-h1 font-bold text-gray-900 dark:text-white mb-4 text-center">
             Hackathon
           </h1>
           {/* Subtitle */}
@@ -209,12 +214,12 @@ export default function HomePage() {
             "Inovasi AI: Mendorong Usaha Lokal dengan AI Inklusif"
           </p>
           {/* Description */}
-          <p className="text-p3 text-gray-600 max-w-lg md:max-w-xl text-center mb-8 md:mb-12 px-4 font-sans">
+          <p className="text-p3 text-gray-600 dark:text-neutral-400 max-w-lg md:max-w-xl text-center mb-8 md:mb-12 px-4 font-sans">
             Kompetisi pengembangan teknologi untuk menciptakan solusi inovatif
             yang menghadirkan dampak nyata
           </p>
           {/* Status */}
-          <div className="flex items-center gap-4 md:gap-8 mb-10 md:mb-16 text-base text-gray-600">
+          <div className="flex items-center gap-4 md:gap-8 mb-10 md:mb-16 text-base text-gray-600 dark:text-neutral-400">
             <div className="flex items-center gap-2 md:gap-3">
               <Icon icon="streamline-plump:web" width="16" height="16" />
               <span>Online</span>
@@ -236,7 +241,7 @@ export default function HomePage() {
               href="https://chat.whatsapp.com/BlxrYh9uSC37d7VPhJslGL"
               target="_blank"
               rel="noopener noreferrer"
-              className="inline-flex items-center justify-center px-4 py-2.5 border-2 border-gray-300 hover:border-gray-400 transition-colors text-center bg-transparent hover:text-gray-900 hover:bg-gray-50 text-base text-gray-600 rounded-lg font-bai-jamjuree font-semibold"
+              className="inline-flex items-center justify-center px-4 py-2.5 border-2 border-gray-300 dark:border-neutral-600 hover:border-gray-400 dark:hover:border-neutral-500 transition-colors text-center bg-transparent hover:text-gray-900 dark:hover:text-white hover:bg-gray-50 dark:hover:bg-neutral-800 text-base text-gray-600 dark:text-neutral-400 rounded-lg font-bai-jamjuree font-semibold"
             >
               Gabung Grup WA Hackathon
             </a>
@@ -244,7 +249,7 @@ export default function HomePage() {
           {/* Scroll indicator */}
           <div className="mt-12 md:mt-20">
             <svg
-              className="w-6 h-6 text-gray-400 animate-bounce"
+              className="w-6 h-6 text-gray-400 dark:text-neutral-500 animate-bounce"
               fill="none"
               stroke="currentColor"
               viewBox="0 0 24 24"
@@ -261,17 +266,17 @@ export default function HomePage() {
       </section>
 
       {/* About Section */}
-      <section className="py-16 md:py-24 px-4 md:px-8 bg-white">
+      <section className="py-16 md:py-24 px-4 md:px-8 bg-white dark:bg-neutral-950">
         <div className="max-w-4xl mx-auto text-center">
-          <h2 className="text-3xl md:text-5xl font-bold mb-10">
+          <h2 className="text-3xl md:text-5xl font-bold mb-10 dark:text-white">
             Tentang <span className="text-primary-500">Hackathon</span>
           </h2>
-          <p className="font-sans text-lg md:text-xl text-left md:text-center text-gray-600 mb-6">
-            <span className="font-semibold text-gray-900">Hackathon</span>{' '}
+          <p className="font-sans text-lg md:text-xl text-left md:text-center text-gray-600 dark:text-neutral-400 mb-6">
+            <span className="font-semibold text-gray-900 dark:text-white">Hackathon</span>{' '}
             adalah kompetisi pengembangan teknologi yang mengajak talenta muda
             untuk berkolaborasi dalam menciptakan solusi inovatif.
           </p>
-          <p className="font-sans text-lg md:text-xl text-left md:text-center text-gray-600">
+          <p className="font-sans text-lg md:text-xl text-left md:text-center text-gray-600 dark:text-neutral-400">
             IMPHNEN bersama Kolosal.ai mengadakan Hackathon dengan tema lomba{' '}
             <span className="font-semibold text-primary-500">
               "Inovasi AI: Mendorong Usaha Lokal dengan AI Inklusif"
@@ -282,10 +287,10 @@ export default function HomePage() {
       </section>
 
       {/* Prizes Section */}
-      <section id="hadiah" className="py-16 md:py-24 px-4 md:px-8 bg-gray-50">
+      <section id="hadiah" className="py-16 md:py-24 px-4 md:px-8 bg-gray-50 dark:bg-neutral-900">
         <div className="max-w-lg md:max-w-6xl mx-auto">
           <div className="text-center mb-12">
-            <h2 className="text-3xl md:text-5xl font-bold mb-4 font-bai-jamjuree">
+            <h2 className="text-3xl md:text-5xl font-bold mb-4 font-bai-jamjuree dark:text-white">
               Hadiah <span className="text-primary-500">Menarik</span>
             </h2>
             <p className="text-xl md:text-2xl text-primary-500 font-semibold font-sans">
@@ -295,67 +300,67 @@ export default function HomePage() {
 
           <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6">
             {/* Prize 1 */}
-            <div className="bg-white rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 hover:border-primary-500 transition-colors">
+            <div className="bg-white dark:bg-neutral-800 rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 dark:border-neutral-700 hover:border-primary-500 dark:hover:border-primary-500 transition-colors">
               <div className="flex justify-center mb-4">
-                <div className="w-16 h-16 bg-primary-100 rounded-full flex items-center justify-center">
+                <div className="w-16 h-16 bg-primary-100 dark:bg-primary-900/30 rounded-full flex items-center justify-center">
                   <Icon
                     icon="ic:round-star"
                     className="h-8 w-8 text-primary-500"
                   />
                 </div>
               </div>
-              <h3 className="text-xl font-bold text-center mb-2">Juara 1</h3>
+              <h3 className="text-xl font-bold text-center mb-2 dark:text-white">Juara 1</h3>
               <p className="text-2xl font-bold text-primary-500 text-center font-sans">
                 Rp6.000.000
               </p>
             </div>
 
             {/* Prize 2 */}
-            <div className="bg-white rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 hover:border-gray-500 transition-colors">
+            <div className="bg-white dark:bg-neutral-800 rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 dark:border-neutral-700 hover:border-gray-500 dark:hover:border-neutral-500 transition-colors">
               <div className="flex justify-center mb-4">
-                <div className="w-16 h-16 bg-gray-100 rounded-full flex items-center justify-center">
+                <div className="w-16 h-16 bg-gray-100 dark:bg-neutral-700 rounded-full flex items-center justify-center">
                   <Icon
                     icon="ic:round-star"
-                    className="h-8 w-8 text-gray-600"
+                    className="h-8 w-8 text-gray-600 dark:text-neutral-400"
                   />
                 </div>
               </div>
-              <h3 className="text-xl font-bold text-center mb-2">Juara 2</h3>
+              <h3 className="text-xl font-bold text-center mb-2 dark:text-white">Juara 2</h3>
               <p className="text-2xl font-bold text-primary-500 text-center font-sans">
                 Rp4.000.000
               </p>
             </div>
 
             {/* Prize 3 */}
-            <div className="bg-white rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 hover:border-orange-300 transition-colors">
+            <div className="bg-white dark:bg-neutral-800 rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 dark:border-neutral-700 hover:border-orange-300 dark:hover:border-orange-500 transition-colors">
               <div className="flex justify-center mb-4">
-                <div className="w-16 h-16 bg-orange-100 rounded-full flex items-center justify-center">
+                <div className="w-16 h-16 bg-orange-100 dark:bg-orange-900/30 rounded-full flex items-center justify-center">
                   <Icon
                     icon="ic:round-star"
-                    className="h-8 w-8 text-orange-600"
+                    className="h-8 w-8 text-orange-600 dark:text-orange-500"
                   />
                 </div>
               </div>
-              <h3 className="text-xl font-bold text-center mb-2">Juara 3</h3>
-              <p className="text-2xl font-bold text-orange-600 text-center font-sans">
+              <h3 className="text-xl font-bold text-center mb-2 dark:text-white">Juara 3</h3>
+              <p className="text-2xl font-bold text-orange-600 dark:text-orange-500 text-center font-sans">
                 Rp2.500.000
               </p>
             </div>
 
             {/* Special Prize */}
-            <div className="bg-white rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 hover:border-purple-300 transition-colors">
+            <div className="bg-white dark:bg-neutral-800 rounded-xl px-4 py-8 shadow-lg border-2 border-gray-300 dark:border-neutral-700 hover:border-purple-300 dark:hover:border-purple-500 transition-colors">
               <div className="flex justify-center mb-4">
-                <div className="w-16 h-16 bg-purple-100 rounded-full flex items-center justify-center">
+                <div className="w-16 h-16 bg-purple-100 dark:bg-purple-900/30 rounded-full flex items-center justify-center">
                   <Icon
                     icon="ic:round-star"
-                    className="h-8 w-8 text-purple-600"
+                    className="h-8 w-8 text-purple-600 dark:text-purple-500"
                   />
                 </div>
               </div>
-              <h3 className="text-xl font-bold text-center mb-2">
+              <h3 className="text-xl font-bold text-center mb-2 dark:text-white">
                 Juara Kategori Lainnya
               </h3>
-              <p className="text-2xl font-bold text-purple-600 text-center font-sans">
+              <p className="text-2xl font-bold text-purple-600 dark:text-purple-500 text-center font-sans">
                 Rp2.000.000
               </p>
             </div>
@@ -364,13 +369,13 @@ export default function HomePage() {
       </section>
 
       {/* Timeline Section */}
-      <section id="timeline" className="py-16 md:py-24 px-4 md:px-8 bg-white">
+      <section id="timeline" className="py-16 md:py-24 px-4 md:px-8 bg-white dark:bg-neutral-950">
         <div className="max-w-4xl mx-auto font-sans">
           <div className="text-center mb-12 font-bai-jamjuree">
-            <h2 className="text-3xl md:text-5xl font-bold mb-4">
+            <h2 className="text-3xl md:text-5xl font-bold mb-4 dark:text-white">
               Timeline <span className="text-primary-500">Acara</span>
             </h2>
-            <p className="text-lg text-gray-600">
+            <p className="text-lg text-gray-600 dark:text-neutral-400">
               Jadwal lengkap pelaksanaan hackathon
             </p>
           </div>
@@ -380,14 +385,14 @@ export default function HomePage() {
             <div className="flex gap-6">
               <div className="flex flex-col items-center">
                 <div className="w-4 h-4 bg-primary-500 rounded-full"></div>
-                <div className="w-0.5 h-full bg-gray-300"></div>
+                <div className="w-0.5 h-full bg-gray-300 dark:bg-neutral-700"></div>
               </div>
               <div className="flex-1 pb-8">
                 <p className="text-primary-500 font-semibold mb-2">
                   30 November 2025
                 </p>
-                <h3 className="text-xl font-bold mb-2">Penutupan Registrasi</h3>
-                <p className="text-gray-600">
+                <h3 className="text-xl font-bold mb-2 dark:text-white">Penutupan Registrasi</h3>
+                <p className="text-gray-600 dark:text-neutral-400">
                   Batas akhir pendaftaran peserta hackathon.
                 </p>
               </div>
@@ -397,14 +402,14 @@ export default function HomePage() {
             <div className="flex gap-6">
               <div className="flex flex-col items-center">
                 <div className="w-4 h-4 bg-primary-500 rounded-full"></div>
-                <div className="w-0.5 h-full bg-gray-300"></div>
+                <div className="w-0.5 h-full bg-gray-300 dark:bg-neutral-700"></div>
               </div>
               <div className="flex-1 pb-8">
                 <p className="text-primary-500 font-semibold mb-2">
                   30 November 2025
                 </p>
-                <h3 className="text-xl font-bold mb-2">Technical Meeting</h3>
-                <p className="text-gray-600">
+                <h3 className="text-xl font-bold mb-2 dark:text-white">Technical Meeting</h3>
+                <p className="text-gray-600 dark:text-neutral-400">
                   Akan diadakan technical meeting terkait lomba melalui Google
                   Meet. Stay tune di grup WA Hackathon.
                 </p>
@@ -415,14 +420,14 @@ export default function HomePage() {
             <div className="flex gap-6">
               <div className="flex flex-col items-center">
                 <div className="w-4 h-4 bg-primary-500 rounded-full"></div>
-                <div className="w-0.5 h-full bg-gray-300"></div>
+                <div className="w-0.5 h-full bg-gray-300 dark:bg-neutral-700"></div>
               </div>
               <div className="flex-1 pb-8">
                 <p className="text-primary-500 font-semibold mb-2">
                   1 - 7 Desember 2025
                 </p>
-                <h3 className="text-xl font-bold mb-2">Tahap Penyisihan</h3>
-                <p className="text-gray-600">
+                <h3 className="text-xl font-bold mb-2 dark:text-white">Tahap Penyisihan</h3>
+                <p className="text-gray-600 dark:text-neutral-400">
                   Peserta mengerjakan tantangan yang diberikan.
                 </p>
               </div>
@@ -432,14 +437,14 @@ export default function HomePage() {
             <div className="flex gap-6">
               <div className="flex flex-col items-center">
                 <div className="w-4 h-4 bg-primary-500 rounded-full"></div>
-                <div className="w-0.5 h-full bg-gray-300"></div>
+                <div className="w-0.5 h-full bg-gray-300 dark:bg-neutral-700"></div>
               </div>
               <div className="flex-1 pb-8">
                 <p className="text-primary-500 font-semibold mb-2">
                   8 - 14 Desember 2025
                 </p>
-                <h3 className="text-xl font-bold mb-2">Penilaian & Webinar</h3>
-                <p className="text-gray-600">
+                <h3 className="text-xl font-bold mb-2 dark:text-white">Penilaian & Webinar</h3>
+                <p className="text-gray-600 dark:text-neutral-400">
                   Proses penilaian oleh juri dan sesi webinar.
                 </p>
               </div>
@@ -454,8 +459,8 @@ export default function HomePage() {
                 <p className="text-primary-500 font-semibold mb-2">
                   15 Desember 2025
                 </p>
-                <h3 className="text-xl font-bold mb-2">Pengumuman & Final</h3>
-                <p className="text-gray-600">
+                <h3 className="text-xl font-bold mb-2 dark:text-white">Pengumuman & Final</h3>
+                <p className="text-gray-600 dark:text-neutral-400">
                   Presentasi final dan pengumuman pemenang.
                 </p>
               </div>
@@ -465,47 +470,44 @@ export default function HomePage() {
       </section>
 
       {/* Judges Section */}
-      <section className="py-16 md:py-24 px-4 md:px-8 bg-gray-50 font-sans">
+      <section className="py-16 md:py-24 px-4 md:px-8 bg-gray-50 dark:bg-neutral-900 font-sans">
         <div className="md:max-w-6xl mx-auto">
           <div className="text-center mb-12 font-bai-jamjuree">
-            <h2 className="text-3xl md:text-5xl font-bold mb-4">
+            <h2 className="text-3xl md:text-5xl font-bold mb-4 dark:text-white">
               Dewan <span className="text-primary-500">Juri</span>
             </h2>
-            <p className="text-lg text-gray-600">
+            <p className="text-lg text-gray-600 dark:text-neutral-400">
               Perwakilan dari IMPHNEN dan Kolosal.ai yang akan menilai karya
             </p>
           </div>
 
           <div className="w-full max-w-md md:max-w-4xl mx-auto grid grid-cols-1 md:grid-cols-3 gap-8">
             {/* Judge 1 */}
-            <div className="flex flex-col justify-between bg-white rounded-xl px-4 py-8 shadow-lg text-center">
-              {/* <div className="w-24 h-24 bg-gray-200 rounded-full mx-auto mb-4"></div> */}
-              <h3 className="text-p3 font-bold mb-1">
+            <div className="flex flex-col justify-between bg-white dark:bg-neutral-800 rounded-xl px-4 py-8 shadow-lg text-center">
+              <h3 className="text-p3 font-bold mb-1 dark:text-white">
                 Alifais Farrel Ramdhani
               </h3>
               <div>
                 <p className="text-primary-500 font-semibold mb-1">CTO</p>
-                <p className="text-gray-600">Kolosal.ai</p>
+                <p className="text-gray-600 dark:text-neutral-400">Kolosal.ai</p>
               </div>
             </div>
 
             {/* Judge 2 */}
-            <div className="flex flex-col justify-between bg-white rounded-xl px-4 py-8 shadow-lg text-center">
-              {/* <div className="w-24 h-24 bg-gray-200 rounded-full mx-auto mb-4"></div> */}
-              <h3 className="text-p3 font-bold mb-1">Anka Tama</h3>
+            <div className="flex flex-col justify-between bg-white dark:bg-neutral-800 rounded-xl px-4 py-8 shadow-lg text-center">
+              <h3 className="text-p3 font-bold mb-1 dark:text-white">Anka Tama</h3>
               <div>
                 <p className="text-primary-500 font-semibold mb-1">Admin</p>
-                <p className="text-gray-600">IMPHNEN</p>
+                <p className="text-gray-600 dark:text-neutral-400">IMPHNEN</p>
               </div>
             </div>
 
             {/* Judge 3 */}
-            <div className="flex flex-col justify-between bg-white rounded-xl px-4 py-8 shadow-lg text-center">
-              {/* <div className="w-24 h-24 bg-gray-200 rounded-full mx-auto mb-4"></div> */}
-              <h3 className="text-p3 font-bold mb-1">Hafid Nur</h3>
+            <div className="flex flex-col justify-between bg-white dark:bg-neutral-800 rounded-xl px-4 py-8 shadow-lg text-center">
+              <h3 className="text-p3 font-bold mb-1 dark:text-white">Hafid Nur</h3>
               <div>
                 <p className="text-primary-500 font-semibold mb-1">Moderator</p>
-                <p className="text-gray-600">IMPHNEN</p>
+                <p className="text-gray-600 dark:text-neutral-400">IMPHNEN</p>
               </div>
             </div>
           </div>
@@ -513,25 +515,25 @@ export default function HomePage() {
       </section>
 
       {/* FAQ Section */}
-      <section id="faq" className="py-16 md:py-24 px-4 md:px-8 bg-white">
+      <section id="faq" className="py-16 md:py-24 px-4 md:px-8 bg-white dark:bg-neutral-950">
         <div className="max-w-4xl mx-auto">
           <div className="text-center mb-12">
             <h2 className="text-3xl md:text-5xl font-bold mb-4 text-primary-500">
               FAQ
             </h2>
-            <p className="text-lg text-gray-600">
+            <p className="text-lg text-gray-600 dark:text-neutral-400">
               Pertanyaan yang Sering Diajukan
             </p>
           </div>
 
           <div className="space-y-4 font-sans">
             {faqs.map((faq, index) => (
-              <div key={index} className="border border-gray-200 rounded-lg">
+              <div key={index} className="border border-gray-200 dark:border-neutral-700 rounded-lg">
                 <button
                   onClick={() => setOpenFaq(openFaq === index ? null : index)}
-                  className="w-full px-6 py-4 flex items-center justify-between text-left hover:bg-gray-50 transition-colors cursor-pointer"
+                  className="w-full px-6 py-4 flex items-center justify-between text-left hover:bg-gray-50 dark:hover:bg-neutral-800 transition-colors cursor-pointer"
                 >
-                  <span className="font-semibold text-gray-900">
+                  <span className="font-semibold text-gray-900 dark:text-white">
                     {faq.question}
                   </span>
                   <svg
@@ -551,7 +553,7 @@ export default function HomePage() {
                   </svg>
                 </button>
                 {openFaq === index && (
-                  <div className="px-6 pb-4 text-gray-600">{faq.answer}</div>
+                  <div className="px-6 pb-4 text-gray-600 dark:text-neutral-400">{faq.answer}</div>
                 )}
               </div>
             ))}
@@ -560,12 +562,12 @@ export default function HomePage() {
       </section>
 
       {/* Sponsors Section */}
-      <section className="py-20 md:py-28 px-4 md:px-8 bg-gray-50">
+      <section className="py-20 md:py-28 px-4 md:px-8 bg-gray-50 dark:bg-neutral-900">
         <div className="max-w-6xl mx-auto text-center">
-          <h2 className="text-3xl md:text-5xl font-bold mb-4">
+          <h2 className="text-3xl md:text-5xl font-bold mb-4 dark:text-white">
             Sponsor & <span className="text-primary-500">Partner</span>
           </h2>
-          <p className="text-lg text-gray-600 mb-8">
+          <p className="text-lg text-gray-600 dark:text-neutral-400 mb-8">
             Acara ini sepenuhnya disponsori oleh
           </p>
 
@@ -574,12 +576,12 @@ export default function HomePage() {
               href="https://kolosal.ai"
               target="_blank"
               rel="noopener noreferrer"
-              className="bg-white rounded-xl p-8 shadow-lg inline-block border-2 border-transparent hover:border-gray-500 transition-colors"
+              className="bg-white dark:bg-neutral-800 rounded-xl p-8 shadow-lg inline-block border-2 border-transparent hover:border-gray-500 dark:hover:border-neutral-500 transition-colors"
             >
               <img
                 src="images/sponsors/kolosal-logo_rlxbck.svg"
                 alt="Kolosal.ai"
-                className="h-12 md:h-16"
+                className="h-12 md:h-16 dark:invert"
               />
             </a>
           </div>
@@ -589,13 +591,13 @@ export default function HomePage() {
       {/* CTA Section */}
       <section
         id="masuk"
-        className="py-20 md:py-28 px-4 md:px-8 bg-linear-to-b from-white to-blue-50"
+        className="py-20 md:py-28 px-4 md:px-8 bg-linear-to-b from-white to-blue-50 dark:from-neutral-950 dark:to-neutral-900"
       >
         <div className="max-w-4xl mx-auto text-center font-sans">
-          <h2 className="text-3xl md:text-5xl font-bold mb-6 font-bai-jamjuree">
+          <h2 className="text-3xl md:text-5xl font-bold mb-6 font-bai-jamjuree dark:text-white">
             Segera Daftarkan <span className="text-primary-500">Timmu!</span>
           </h2>
-          <p className="text-lg md:text-xl text-left md:text-center text-gray-600 mb-8">
+          <p className="text-lg md:text-xl text-left md:text-center text-gray-600 dark:text-neutral-400 mb-8">
             Jangan lewatkan kesempatan emas untuk bersaing dengan developer
             terbaik,
             <br className="hidden md:block" /> belajar dari para ahli, dan
@@ -613,13 +615,13 @@ export default function HomePage() {
               href="https://chat.whatsapp.com/BlxrYh9uSC37d7VPhJslGL"
               target="_blank"
               rel="noopener noreferrer"
-              className="px-8 py-3 bg-white text-gray-900 text-lg rounded-lg border-2 border-gray-300 hover:border-gray-400 transition-colors font-semibold"
+              className="px-8 py-3 bg-white dark:bg-neutral-800 text-gray-900 dark:text-white text-lg rounded-lg border-2 border-gray-300 dark:border-neutral-600 hover:border-gray-400 dark:hover:border-neutral-500 transition-colors font-semibold"
             >
               Gabung Grup WA Hackathon
             </a>
           </div>
 
-          <p className="text-sm text-gray-500 mt-6">
+          <p className="text-sm text-gray-500 dark:text-neutral-500 mt-6">
             Pendaftaran ditutup pada{' '}
             <span className="text-primary-500 font-semibold">
               30 November 2025
diff --git a/apps/hackathon/src/app/profile/page.tsx b/apps/hackathon/src/app/profile/page.tsx
index 0163665..5d1c195 100644
--- a/apps/hackathon/src/app/profile/page.tsx
+++ b/apps/hackathon/src/app/profile/page.tsx
@@ -128,14 +128,14 @@ const ProfilePage: FC = (): ReactElement => {
   const isLoading = isUpdating || isUploading;
 
   return (
-    <div className="flex flex-col justify-center items-center min-h-screen bg-gray-50 px-4 py-8">
-      <div className="bg-white w-full max-w-md p-8 rounded-xl shadow-lg">
+    <div className="flex flex-col justify-center items-center min-h-screen bg-gray-50 dark:bg-neutral-950 px-4 py-8">
+      <div className="bg-white dark:bg-neutral-900 w-full max-w-md p-8 rounded-xl shadow-lg">
         <div className="mb-6">
           <div className="flex items-center justify-between mb-2">
-            <h1 className="text-2xl font-bold text-gray-900">Edit Profile</h1>
+            <h1 className="text-2xl font-bold text-gray-900 dark:text-white">Edit Profile</h1>
             <Link
               to="/dashboard"
-              className="text-gray-500 hover:text-gray-700"
+              className="text-gray-500 dark:text-neutral-400 hover:text-gray-700 dark:hover:text-neutral-200"
             >
               <svg
                 className="w-6 h-6"
@@ -152,7 +152,7 @@ const ProfilePage: FC = (): ReactElement => {
               </svg>
             </Link>
           </div>
-          <p className="text-gray-600">Update your photo and name</p>
+          <p className="text-gray-600 dark:text-neutral-400">Update your photo and name</p>
         </div>
 
         <form onSubmit={onSubmit} className="space-y-6">
@@ -163,11 +163,11 @@ const ProfilePage: FC = (): ReactElement => {
                 <img
                   src={avatarPreview}
                   alt="Avatar preview"
-                  className="w-32 h-32 rounded-full object-cover border-4 border-gray-200 group-hover:border-blue-400 transition-colors"
+                  className="w-32 h-32 rounded-full object-cover border-4 border-gray-200 dark:border-neutral-700 group-hover:border-blue-400 dark:group-hover:border-blue-500 transition-colors"
                 />
               ) : (
-                <div className="w-32 h-32 rounded-full bg-gray-200 flex items-center justify-center group-hover:bg-gray-300 transition-colors">
-                  <span className="text-gray-400 text-4xl">👤</span>
+                <div className="w-32 h-32 rounded-full bg-gray-200 dark:bg-neutral-700 flex items-center justify-center group-hover:bg-gray-300 dark:group-hover:bg-neutral-600 transition-colors">
+                  <span className="text-gray-400 dark:text-neutral-500 text-4xl">👤</span>
                 </div>
               )}
               {/* Camera overlay */}
@@ -204,7 +204,7 @@ const ProfilePage: FC = (): ReactElement => {
                 />
               </label>
             </div>
-            <p className="text-xs text-gray-500 text-center">
+            <p className="text-xs text-gray-500 dark:text-neutral-400 text-center">
               Click the camera icon to change your photo
               <br />
               Format: JPG, PNG. Max 5MB
@@ -221,7 +221,7 @@ const ProfilePage: FC = (): ReactElement => {
 
           {/* City */}
           <div className="space-y-2">
-            <label className="block text-sm font-medium text-gray-700">
+            <label className="block text-sm font-medium text-gray-700 dark:text-neutral-300">
               City
             </label>
             <Controller
@@ -240,7 +240,7 @@ const ProfilePage: FC = (): ReactElement => {
 
           {/* Role/Skills */}
           <div className="space-y-2">
-            <label className="block text-sm font-medium text-gray-700">
+            <label className="block text-sm font-medium text-gray-700 dark:text-neutral-300">
               Role / Skills
             </label>
             <Controller
@@ -263,9 +263,9 @@ const ProfilePage: FC = (): ReactElement => {
                               : (field.value || []).filter((v) => v !== role);
                             field.onChange(newValue);
                           }}
-                          className="rounded border-gray-300 text-blue-600 focus:ring-blue-500"
+                          className="rounded border-gray-300 dark:border-neutral-600 text-blue-600 focus:ring-blue-500 dark:bg-neutral-800"
                         />
-                        <span className="text-sm">{role}</span>
+                        <span className="text-sm dark:text-neutral-300">{role}</span>
                       </label>
                     ))}
                   </div>
@@ -276,8 +276,8 @@ const ProfilePage: FC = (): ReactElement => {
 
           {/* Bio */}
           <div className="space-y-2">
-            <label className="block text-sm font-medium text-gray-700">
-              Bio <span className="text-gray-400">(Optional)</span>
+            <label className="block text-sm font-medium text-gray-700 dark:text-neutral-300">
+              Bio <span className="text-gray-400 dark:text-neutral-500">(Optional)</span>
             </label>
             <Controller
               control={form.control}
diff --git a/apps/hackathon/src/app/teams/[teamId]/layout.tsx b/apps/hackathon/src/app/teams/[teamId]/layout.tsx
index 070436d..79342a3 100644
--- a/apps/hackathon/src/app/teams/[teamId]/layout.tsx
+++ b/apps/hackathon/src/app/teams/[teamId]/layout.tsx
@@ -6,21 +6,21 @@ const TeamDetailLayout: FC = (): ReactElement => {
   const [sidebarOpen, setSidebarOpen] = useState(false);
 
   return (
-    <div className="flex min-h-screen bg-gray-50">
+    <div className="flex min-h-screen bg-gray-50 dark:bg-neutral-950">
       <Sidebar isOpen={sidebarOpen} onClose={() => setSidebarOpen(false)} />
 
       <div className="flex-1 flex flex-col overflow-auto">
         {/* Mobile Header with Hamburger */}
-        <div className="lg:hidden bg-white border-b px-4 py-3 flex items-center">
+        <div className="lg:hidden bg-white dark:bg-neutral-900 border-b dark:border-neutral-700 px-4 py-3 flex items-center">
           <button
             onClick={() => setSidebarOpen(true)}
-            className="p-2 rounded-lg hover:bg-gray-100 transition-colors"
+            className="p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-neutral-800 transition-colors"
           >
-            <svg className="w-6 h-6 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <svg className="w-6 h-6 text-gray-600 dark:text-neutral-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
             </svg>
           </button>
-          <h1 className="ml-3 text-lg font-bold text-gray-900">🏆 Hackathon</h1>
+          <h1 className="ml-3 text-lg font-bold text-gray-900 dark:text-white">Hackathon</h1>
         </div>
 
         <main className="flex-1 overflow-auto">
diff --git a/apps/hackathon/src/app/teams/[teamId]/page.tsx b/apps/hackathon/src/app/teams/[teamId]/page.tsx
index 4383796..fb9f035 100644
--- a/apps/hackathon/src/app/teams/[teamId]/page.tsx
+++ b/apps/hackathon/src/app/teams/[teamId]/page.tsx
@@ -60,7 +60,7 @@ const TeamDashboardPage: FC = (): ReactElement => {
   if (isLoadingTeam || isLoadingMembers) {
     return (
       <div className="flex items-center justify-center min-h-screen">
-        <div className="text-gray-600">Loading team...</div>
+        <div className="text-gray-600 dark:text-neutral-400">Loading team...</div>
       </div>
     );
   }
@@ -68,16 +68,16 @@ const TeamDashboardPage: FC = (): ReactElement => {
   if (!team) {
     return (
       <div className="flex flex-col items-center justify-center min-h-screen">
-        <h2 className="text-2xl font-bold text-gray-900 mb-4">Team not found</h2>
+        <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-4">Team not found</h2>
         <Button onClick={() => navigate('/dashboard')}>Back to Dashboard</Button>
       </div>
     );
   }
 
   return (
-    <div className="min-h-screen bg-gray-50">
+    <div className="min-h-screen bg-gray-50 dark:bg-neutral-950">
       {/* Header with Banner */}
-      <div className="bg-white border-b">
+      <div className="bg-white dark:bg-neutral-900 border-b dark:border-neutral-700">
         {team.banner && (
           <div className="w-full h-32 md:h-48 overflow-hidden">
             <img
@@ -98,13 +98,13 @@ const TeamDashboardPage: FC = (): ReactElement => {
                 />
               )}
               <div>
-                <h1 className="text-xl md:text-3xl font-bold text-gray-900 line-clamp-2">{team.name}</h1>
-                <p className="text-sm md:text-base text-gray-600 mt-1 line-clamp-1">📍 {team.city}</p>
+                <h1 className="text-xl md:text-3xl font-bold text-gray-900 dark:text-white line-clamp-2">{team.name}</h1>
+                <p className="text-sm md:text-base text-gray-600 dark:text-neutral-400 mt-1 line-clamp-1">📍 {team.city}</p>
                 <div className="flex flex-wrap items-center gap-2 md:space-x-4 mt-2">
-                  <span className="text-sm text-gray-500">
+                  <span className="text-sm text-gray-500 dark:text-neutral-400">
                     {members.length} {members.length === 1 ? 'Member' : 'Members'}
                   </span>
-                  <span className="text-sm text-gray-500">
+                  <span className="text-sm text-gray-500 dark:text-neutral-400">
                     {team.visibility === 'public' ? '🌐 Public' : '🔒 Private'}
                   </span>
                   {isLeader && (
@@ -124,15 +124,15 @@ const TeamDashboardPage: FC = (): ReactElement => {
           {/* Main Content */}
           <div className="lg:col-span-2 space-y-4 md:space-y-6">
             {/* Team Description */}
-            <div className="bg-white rounded-lg shadow-md p-4 md:p-6">
-              <h2 className="text-lg md:text-xl font-bold text-gray-900 mb-3 md:mb-4">About Team</h2>
-              <p className="text-gray-700 whitespace-pre-wrap">{team.description}</p>
+            <div className="bg-white dark:bg-neutral-800 rounded-lg shadow-md p-4 md:p-6">
+              <h2 className="text-lg md:text-xl font-bold text-gray-900 dark:text-white mb-3 md:mb-4">About Team</h2>
+              <p className="text-gray-700 dark:text-neutral-300 whitespace-pre-wrap">{team.description}</p>
             </div>
 
             {/* Team Actions - Only for Leader */}
             {isLeader && (
-              <div className="bg-white rounded-lg shadow-md p-4 md:p-6">
-                <h2 className="text-lg md:text-xl font-bold text-gray-900 mb-3 md:mb-4">Team Management</h2>
+              <div className="bg-white dark:bg-neutral-800 rounded-lg shadow-md p-4 md:p-6">
+                <h2 className="text-lg md:text-xl font-bold text-gray-900 dark:text-white mb-3 md:mb-4">Team Management</h2>
                 <div className="grid gap-3 sm:grid-cols-2">
                   <Button
                     className="w-full"
@@ -176,7 +176,7 @@ const TeamDashboardPage: FC = (): ReactElement => {
                   </Link>
                 </div>
                 {!canInvite && members.length >= MAX_TEAM_MEMBERS && (
-                  <p className="text-sm text-gray-600 mt-3 text-center">
+                  <p className="text-sm text-gray-600 dark:text-neutral-400 mt-3 text-center">
                     Maximum team size reached ({MAX_TEAM_MEMBERS} members)
                   </p>
                 )}
@@ -185,8 +185,8 @@ const TeamDashboardPage: FC = (): ReactElement => {
 
             {/* Quick Actions for Members (non-leaders) */}
             {!isLeader && isMember && (
-              <div className="bg-white rounded-lg shadow-md p-4 md:p-6">
-                <h2 className="text-lg md:text-xl font-bold text-gray-900 mb-3 md:mb-4">Quick Actions</h2>
+              <div className="bg-white dark:bg-neutral-800 rounded-lg shadow-md p-4 md:p-6">
+                <h2 className="text-lg md:text-xl font-bold text-gray-900 dark:text-white mb-3 md:mb-4">Quick Actions</h2>
                 <div className="grid gap-3 sm:grid-cols-2">
                   <Link to={`/teams/${teamId}/chat`}>
                     <Button className="w-full" variant="secondary">
@@ -206,12 +206,12 @@ const TeamDashboardPage: FC = (): ReactElement => {
 
             {/* Submission Status - Only show to members */}
             {team.has_submission && isMember && (
-              <div className="bg-green-50 border border-green-200 rounded-lg p-4 md:p-6">
+              <div className="bg-green-50 dark:bg-green-900/20 border border-green-200 dark:border-green-800 rounded-lg p-4 md:p-6">
                 <div className="flex items-center space-x-3">
                   <span className="text-3xl">✅</span>
                   <div>
-                    <h3 className="font-bold text-green-900">Project Submitted</h3>
-                    <p className="text-green-700 text-sm">
+                    <h3 className="font-bold text-green-900 dark:text-green-400">Project Submitted</h3>
+                    <p className="text-green-700 dark:text-green-300 text-sm">
                       Your team has successfully submitted a project
                     </p>
                   </div>
@@ -228,12 +228,12 @@ const TeamDashboardPage: FC = (): ReactElement => {
           {/* Sidebar */}
           <div className="space-y-4 md:space-y-6">
             {/* Team Leader */}
-            <div className="bg-white rounded-lg shadow-md p-4 md:p-6">
-              <h3 className="text-base md:text-lg font-bold text-gray-900 mb-3 md:mb-4">Team Leader</h3>
+            <div className="bg-white dark:bg-neutral-800 rounded-lg shadow-md p-4 md:p-6">
+              <h3 className="text-base md:text-lg font-bold text-gray-900 dark:text-white mb-3 md:mb-4">Team Leader</h3>
               {team.leader && (
                 <button
                   onClick={() => navigate(`/users/${team.leader.id}`)}
-                  className="w-full flex items-center space-x-3 hover:bg-gray-100 rounded-lg p-2 transition-colors text-left cursor-pointer"
+                  className="w-full flex items-center space-x-3 hover:bg-gray-100 dark:hover:bg-neutral-700 rounded-lg p-2 transition-colors text-left cursor-pointer"
                 >
                   {team.leader.avatar ? (
                     <img
@@ -242,21 +242,21 @@ const TeamDashboardPage: FC = (): ReactElement => {
                       className="w-12 h-12 rounded-full object-cover"
                     />
                   ) : (
-                    <div className="w-12 h-12 rounded-full bg-gray-200 flex items-center justify-center">
-                      <span className="text-gray-500">👤</span>
+                    <div className="w-12 h-12 rounded-full bg-gray-200 dark:bg-neutral-700 flex items-center justify-center">
+                      <span className="text-gray-500 dark:text-neutral-400">👤</span>
                     </div>
                   )}
                   <div>
-                    <p className="font-medium text-gray-900">{team.leader.fullname}</p>
-                    <p className="text-sm text-gray-600">{team.leader.email}</p>
+                    <p className="font-medium text-gray-900 dark:text-white">{team.leader.fullname}</p>
+                    <p className="text-sm text-gray-600 dark:text-neutral-400">{team.leader.email}</p>
                   </div>
                 </button>
               )}
             </div>
 
             {/* Team Members */}
-            <div className="bg-white rounded-lg shadow-md p-4 md:p-6">
-              <h3 className="text-base md:text-lg font-bold text-gray-900 mb-3 md:mb-4">
+            <div className="bg-white dark:bg-neutral-800 rounded-lg shadow-md p-4 md:p-6">
+              <h3 className="text-base md:text-lg font-bold text-gray-900 dark:text-white mb-3 md:mb-4">
                 Members ({members.length})
               </h3>
               <div className="space-y-3">
@@ -264,7 +264,7 @@ const TeamDashboardPage: FC = (): ReactElement => {
                   <button
                     key={member.id}
                     onClick={() => navigate(`/users/${member.user.id}`)}
-                    className="w-full flex items-center space-x-3 hover:bg-gray-100 rounded-lg p-2 transition-colors text-left cursor-pointer"
+                    className="w-full flex items-center space-x-3 hover:bg-gray-100 dark:hover:bg-neutral-700 rounded-lg p-2 transition-colors text-left cursor-pointer"
                   >
                     {member.user.avatar ? (
                       <img
@@ -273,15 +273,15 @@ const TeamDashboardPage: FC = (): ReactElement => {
                         className="w-10 h-10 rounded-full object-cover"
                       />
                     ) : (
-                      <div className="w-10 h-10 rounded-full bg-gray-200 flex items-center justify-center">
-                        <span className="text-gray-500 text-sm">👤</span>
+                      <div className="w-10 h-10 rounded-full bg-gray-200 dark:bg-neutral-700 flex items-center justify-center">
+                        <span className="text-gray-500 dark:text-neutral-400 text-sm">👤</span>
                       </div>
                     )}
                     <div className="flex-1 min-w-0">
-                      <p className="font-medium text-gray-900 truncate">
+                      <p className="font-medium text-gray-900 dark:text-white truncate">
                         {member.user.fullname}
                       </p>
-                      <p className="text-xs text-gray-500">
+                      <p className="text-xs text-gray-500 dark:text-neutral-400">
                         {member.role === ETeamMemberRole.LEADER ? 'Leader' : 'Member'}
                       </p>
                     </div>
@@ -295,22 +295,22 @@ const TeamDashboardPage: FC = (): ReactElement => {
 
       {/* Invite Member Modal */}
       {showInviteModal && (
-        <div className="fixed inset-0 bg-black/20 backdrop-blur-sm flex items-center justify-center z-50 p-4">
-          <div className="bg-white rounded-lg shadow-xl max-w-md w-full p-6">
-            <h2 className="text-2xl font-bold text-gray-900 mb-4">
+        <div className="fixed inset-0 bg-black/20 dark:bg-black/50 backdrop-blur-sm flex items-center justify-center z-50 p-4">
+          <div className="bg-white dark:bg-neutral-900 rounded-lg shadow-xl max-w-md w-full p-6">
+            <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-4">
               Invite Team Member
             </h2>
-            <p className="text-gray-600 mb-4">
+            <p className="text-gray-600 dark:text-neutral-400 mb-4">
               Send an invitation to join your team. The invited member will see the invitation on their dashboard after logging in.
             </p>
-            <div className="bg-yellow-50 border border-yellow-200 rounded-lg p-3 mb-6">
-              <p className="text-sm text-yellow-800">
+            <div className="bg-yellow-50 dark:bg-yellow-900/20 border border-yellow-200 dark:border-yellow-800 rounded-lg p-3 mb-6">
+              <p className="text-sm text-yellow-800 dark:text-yellow-300">
                 <strong>Important:</strong> The email you enter must match the GitHub email address the member uses to sign in.
               </p>
             </div>
             <form onSubmit={handleInviteMember} className="space-y-4">
               <div>
-                <label htmlFor="invite-email" className="block text-sm font-medium text-gray-700 mb-2">
+                <label htmlFor="invite-email" className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-2">
                   Email Address
                 </label>
                 <input
@@ -319,10 +319,10 @@ const TeamDashboardPage: FC = (): ReactElement => {
                   value={inviteEmail}
                   onChange={(e) => setInviteEmail(e.target.value)}
                   placeholder="Enter email address..."
-                  className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
+                  className="w-full px-3 py-2 border border-gray-300 dark:border-neutral-600 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500"
                   required
                 />
-                <p className="text-sm text-gray-500 mt-1">
+                <p className="text-sm text-gray-500 dark:text-neutral-400 mt-1">
                   Current members: {members.length}/{MAX_TEAM_MEMBERS}
                 </p>
               </div>
@@ -353,15 +353,15 @@ const TeamDashboardPage: FC = (): ReactElement => {
 
       {/* Join Requests Modal */}
       {showJoinRequestsModal && (
-        <div className="fixed inset-0 bg-black/30 backdrop-blur-sm flex items-center justify-center z-50 p-4">
-          <div className="bg-white rounded-lg shadow-xl max-w-2xl w-full p-6 max-h-[80vh] overflow-y-auto">
+        <div className="fixed inset-0 bg-black/30 dark:bg-black/50 backdrop-blur-sm flex items-center justify-center z-50 p-4">
+          <div className="bg-white dark:bg-neutral-900 rounded-lg shadow-xl max-w-2xl w-full p-6 max-h-[80vh] overflow-y-auto">
             <div className="flex items-center justify-between mb-6">
-              <h2 className="text-2xl font-bold text-gray-900">
+              <h2 className="text-2xl font-bold text-gray-900 dark:text-white">
                 Join Requests ({pendingJoinRequests.length})
               </h2>
               <button
                 onClick={() => setShowJoinRequestsModal(false)}
-                className="text-gray-400 hover:text-gray-600 text-2xl"
+                className="text-gray-400 dark:text-neutral-500 hover:text-gray-600 dark:hover:text-neutral-300 text-2xl"
               >
                 ✕
               </button>
@@ -369,15 +369,15 @@ const TeamDashboardPage: FC = (): ReactElement => {
 
             {pendingJoinRequests.length === 0 ? (
               <div className="text-center py-12">
-                <p className="text-gray-600 text-lg">No pending join requests</p>
-                <p className="text-gray-500 text-sm mt-2">
+                <p className="text-gray-600 dark:text-neutral-400 text-lg">No pending join requests</p>
+                <p className="text-gray-500 dark:text-neutral-500 text-sm mt-2">
                   When users request to join your team, they'll appear here
                 </p>
               </div>
             ) : (
               <div className="space-y-4">
                 {pendingJoinRequests.map((request: any) => (
-                  <div key={request.id} className="border border-gray-200 rounded-lg p-4 hover:shadow-md transition-shadow">
+                  <div key={request.id} className="border border-gray-200 dark:border-neutral-700 rounded-lg p-4 hover:shadow-md transition-shadow">
                     <div className="flex items-start justify-between">
                       <div className="flex items-start space-x-3 flex-1">
                         {request.user?.avatar ? (
@@ -387,25 +387,25 @@ const TeamDashboardPage: FC = (): ReactElement => {
                             className="w-12 h-12 rounded-full object-cover"
                           />
                         ) : (
-                          <div className="w-12 h-12 rounded-full bg-gray-200 flex items-center justify-center shrink-0">
-                            <span className="text-gray-500 text-xl">👤</span>
+                          <div className="w-12 h-12 rounded-full bg-gray-200 dark:bg-neutral-700 flex items-center justify-center shrink-0">
+                            <span className="text-gray-500 dark:text-neutral-400 text-xl">👤</span>
                           </div>
                         )}
                         <div className="flex-1">
-                          <p className="font-semibold text-gray-900">
+                          <p className="font-semibold text-gray-900 dark:text-white">
                             {request.user?.fullname || 'Unknown User'}
                           </p>
-                          <p className="text-sm text-gray-600">
+                          <p className="text-sm text-gray-600 dark:text-neutral-400">
                             {request.user?.email}
                           </p>
                           {request.message && (
-                            <div className="mt-2 bg-gray-50 rounded-lg p-3">
-                              <p className="text-sm text-gray-700">
+                            <div className="mt-2 bg-gray-50 dark:bg-neutral-800 rounded-lg p-3">
+                              <p className="text-sm text-gray-700 dark:text-neutral-300">
                                 <strong>Message:</strong> {request.message}
                               </p>
                             </div>
                           )}
-                          <p className="text-xs text-gray-500 mt-2">
+                          <p className="text-xs text-gray-500 dark:text-neutral-500 mt-2">
                             Requested {new Date(request.created_at).toLocaleDateString()}
                           </p>
                         </div>
@@ -429,8 +429,8 @@ const TeamDashboardPage: FC = (): ReactElement => {
                       </div>
                     </div>
                     {members.length >= MAX_TEAM_MEMBERS && (
-                      <div className="mt-3 bg-yellow-50 border border-yellow-200 rounded-lg p-2">
-                        <p className="text-xs text-yellow-800">
+                      <div className="mt-3 bg-yellow-50 dark:bg-yellow-900/20 border border-yellow-200 dark:border-yellow-800 rounded-lg p-2">
+                        <p className="text-xs text-yellow-800 dark:text-yellow-300">
                           Team is full ({MAX_TEAM_MEMBERS}/{MAX_TEAM_MEMBERS} members). Remove a member before accepting new requests.
                         </p>
                       </div>
diff --git a/apps/hackathon/src/app/teams/browse/page.tsx b/apps/hackathon/src/app/teams/browse/page.tsx
index f04c954..6dc61c8 100644
--- a/apps/hackathon/src/app/teams/browse/page.tsx
+++ b/apps/hackathon/src/app/teams/browse/page.tsx
@@ -63,14 +63,14 @@ const BrowseTeamsPage: FC = (): ReactElement => {
   });
 
   return (
-    <div className="min-h-screen bg-gray-50">
+    <div className="min-h-screen bg-gray-50 dark:bg-neutral-950">
       {/* Header */}
-      <div className="bg-white border-b">
+      <div className="bg-white dark:bg-neutral-900 border-b dark:border-neutral-700">
         <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-6">
           <div className="flex items-center justify-between">
             <div>
-              <h1 className="text-3xl font-bold text-gray-900">Browse Teams</h1>
-              <p className="text-gray-600 mt-1">Find and join teams looking for members</p>
+              <h1 className="text-3xl font-bold text-gray-900 dark:text-white">Browse Teams</h1>
+              <p className="text-gray-600 dark:text-neutral-400 mt-1">Find and join teams looking for members</p>
             </div>
             <Link to="/dashboard" className="hidden md:block">
               <Button variant="secondary">Back to Dashboard</Button>
@@ -81,10 +81,10 @@ const BrowseTeamsPage: FC = (): ReactElement => {
 
       {/* Filters */}
       <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-6">
-        <div className="bg-white p-6 rounded-lg shadow-sm mb-6">
+        <div className="bg-white dark:bg-neutral-900 p-6 rounded-lg shadow-sm mb-6">
           <div className="grid gap-4 md:grid-cols-2">
             <div>
-              <label className="block text-sm font-medium text-gray-700 mb-2">
+              <label className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-2">
                 Search Teams
               </label>
               <input
@@ -92,11 +92,11 @@ const BrowseTeamsPage: FC = (): ReactElement => {
                 placeholder="Search by team name..."
                 value={searchTerm}
                 onChange={(e) => setSearchTerm(e.target.value)}
-                className="w-full h-[42px] px-3 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
+                className="w-full h-[42px] px-3 border border-gray-300 dark:border-neutral-600 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500"
               />
             </div>
             <div>
-              <label className="block text-sm font-medium text-gray-700 mb-2">
+              <label className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-2">
                 Filter by City
               </label>
               <CitySelect
@@ -111,17 +111,17 @@ const BrowseTeamsPage: FC = (): ReactElement => {
         {/* Teams List */}
         {isLoading ? (
           <div className="text-center py-12">
-            <p className="text-gray-600">Loading teams...</p>
+            <p className="text-gray-600 dark:text-neutral-400">Loading teams...</p>
           </div>
         ) : teams.length === 0 ? (
-          <div className="bg-white rounded-lg shadow-sm p-12 text-center">
-            <p className="text-gray-600 text-lg">No teams found</p>
-            <p className="text-gray-500 mt-2">Try adjusting your filters</p>
+          <div className="bg-white dark:bg-neutral-900 rounded-lg shadow-sm p-12 text-center">
+            <p className="text-gray-600 dark:text-neutral-400 text-lg">No teams found</p>
+            <p className="text-gray-500 dark:text-neutral-500 mt-2">Try adjusting your filters</p>
           </div>
         ) : (
           <div className="grid gap-6 md:grid-cols-2 lg:grid-cols-3">
             {teams.map((team) => (
-              <div key={team.id} className="bg-white rounded-lg shadow-md overflow-hidden hover:shadow-lg transition-shadow flex flex-col">
+              <div key={team.id} className="bg-white dark:bg-neutral-800 rounded-lg shadow-md overflow-hidden hover:shadow-lg transition-shadow flex flex-col">
                 <img
                   src={team.banner || '/images/banner-imphnen.png'}
                   alt={team.name}
@@ -136,19 +136,19 @@ const BrowseTeamsPage: FC = (): ReactElement => {
                         className="w-12 h-12 rounded-full object-cover"
                       />
                     ) : (
-                      <div className="w-12 h-12 rounded-full bg-gray-200 flex items-center justify-center">
-                        <span className="text-gray-500 text-xl">👥</span>
+                      <div className="w-12 h-12 rounded-full bg-gray-200 dark:bg-neutral-700 flex items-center justify-center">
+                        <span className="text-gray-500 dark:text-neutral-400 text-xl">👥</span>
                       </div>
                     )}
                     <div className="flex-1 min-w-0">
-                      <h3 className="text-lg font-bold text-gray-900 line-clamp-2">{team.name}</h3>
-                      <div className="text-sm text-gray-600 flex gap-2">
+                      <h3 className="text-lg font-bold text-gray-900 dark:text-white line-clamp-2">{team.name}</h3>
+                      <div className="text-sm text-gray-600 dark:text-neutral-400 flex gap-2">
                         <p className="truncate flex-1 min-w-0">📍 {team.city}</p>
                         <p className="whitespace-nowrap shrink-0">👥 {team.members?.length || 0} members</p>
                       </div>
                     </div>
                   </div>
-                  <p className="text-gray-600 text-sm mb-4 line-clamp-3">
+                  <p className="text-gray-600 dark:text-neutral-400 text-sm mb-4 line-clamp-3">
                     {team.description}
                   </p>
                   <div className="space-y-3 mt-auto">
@@ -189,23 +189,23 @@ const BrowseTeamsPage: FC = (): ReactElement => {
 
       {/* Join Request Modal */}
       {showJoinModal && (
-        <div className="fixed inset-0 bg-black/30 backdrop-blur-sm flex items-center justify-center z-50 p-4">
-          <div className="bg-white rounded-lg shadow-xl max-w-md w-full p-6">
-            <h2 className="text-2xl font-bold text-gray-900 mb-4">
+        <div className="fixed inset-0 bg-black/30 dark:bg-black/50 backdrop-blur-sm flex items-center justify-center z-50 p-4">
+          <div className="bg-white dark:bg-neutral-900 rounded-lg shadow-xl max-w-md w-full p-6">
+            <h2 className="text-2xl font-bold text-gray-900 dark:text-white mb-4">
               Request to Join Team
             </h2>
-            <p className="text-gray-600 mb-6">
+            <p className="text-gray-600 dark:text-neutral-400 mb-6">
               Send a message to the team leader explaining why you want to join
             </p>
             <form onSubmit={onSubmit} className="space-y-4">
               <div>
-                <label className="block text-sm font-medium text-gray-700 mb-2">
+                <label className="block text-sm font-medium text-gray-700 dark:text-neutral-300 mb-2">
                   Your Message
                 </label>
                 <textarea
                   {...form.register('message')}
                   rows={4}
-                  className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
+                  className="w-full px-3 py-2 border border-gray-300 dark:border-neutral-600 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500"
                   placeholder="Tell the team leader why you want to join their team..."
                 />
                 {form.formState.errors.message && (
diff --git a/apps/hackathon/src/app/teams/layout.tsx b/apps/hackathon/src/app/teams/layout.tsx
index 182d6ad..778dd9b 100644
--- a/apps/hackathon/src/app/teams/layout.tsx
+++ b/apps/hackathon/src/app/teams/layout.tsx
@@ -6,21 +6,21 @@ const TeamsLayout: FC = (): ReactElement => {
   const [sidebarOpen, setSidebarOpen] = useState(false);
 
   return (
-    <div className="flex min-h-screen bg-gray-50">
+    <div className="flex min-h-screen bg-gray-50 dark:bg-neutral-950">
       <Sidebar isOpen={sidebarOpen} onClose={() => setSidebarOpen(false)} />
 
       <div className="flex-1 flex flex-col overflow-auto">
         {/* Mobile Header with Hamburger */}
-        <div className="lg:hidden bg-white border-b px-4 py-3 flex items-center">
+        <div className="lg:hidden bg-white dark:bg-neutral-900 border-b dark:border-neutral-700 px-4 py-3 flex items-center">
           <button
             onClick={() => setSidebarOpen(true)}
-            className="p-2 rounded-lg hover:bg-gray-100 transition-colors"
+            className="p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-neutral-800 transition-colors"
           >
-            <svg className="w-6 h-6 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <svg className="w-6 h-6 text-gray-600 dark:text-neutral-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
             </svg>
           </button>
-          <h1 className="ml-3 text-lg font-bold text-gray-900">🏆 Hackathon</h1>
+          <h1 className="ml-3 text-lg font-bold text-gray-900 dark:text-white">Hackathon</h1>
         </div>
 
         <main className="flex-1 overflow-auto">
diff --git a/apps/hackathon/src/app/users/[userId]/layout.tsx b/apps/hackathon/src/app/users/[userId]/layout.tsx
index 6ffa5f1..d9dd3cd 100644
--- a/apps/hackathon/src/app/users/[userId]/layout.tsx
+++ b/apps/hackathon/src/app/users/[userId]/layout.tsx
@@ -6,21 +6,21 @@ const UserDetailLayout: FC = (): ReactElement => {
   const [sidebarOpen, setSidebarOpen] = useState(false);
 
   return (
-    <div className="flex min-h-screen bg-gray-50">
+    <div className="flex min-h-screen bg-gray-50 dark:bg-neutral-950">
       <Sidebar isOpen={sidebarOpen} onClose={() => setSidebarOpen(false)} />
 
       <div className="flex-1 flex flex-col overflow-auto">
         {/* Mobile Header with Hamburger */}
-        <div className="lg:hidden bg-white border-b px-4 py-3 flex items-center">
+        <div className="lg:hidden bg-white dark:bg-neutral-900 border-b dark:border-neutral-700 px-4 py-3 flex items-center">
           <button
             onClick={() => setSidebarOpen(true)}
-            className="p-2 rounded-lg hover:bg-gray-100 transition-colors"
+            className="p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-neutral-800 transition-colors"
           >
-            <svg className="w-6 h-6 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <svg className="w-6 h-6 text-gray-600 dark:text-neutral-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
             </svg>
           </button>
-          <h1 className="ml-3 text-lg font-bold text-gray-900">🏆 Hackathon</h1>
+          <h1 className="ml-3 text-lg font-bold text-gray-900 dark:text-white">Hackathon</h1>
         </div>
 
         <main className="flex-1 overflow-auto">
diff --git a/apps/hackathon/src/components/city-select.tsx b/apps/hackathon/src/components/city-select.tsx
index a7dc901..2d90804 100644
--- a/apps/hackathon/src/components/city-select.tsx
+++ b/apps/hackathon/src/components/city-select.tsx
@@ -70,15 +70,15 @@ export const CitySelect: FC<CitySelectProps> = ({
           }}
           onClick={handleInputClick}
           placeholder={placeholder}
-          className={`w-full h-[42px] px-3 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent ${
-            error ? 'border-red-500' : 'border-gray-300'
+          className={`w-full h-[42px] px-3 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent bg-white dark:bg-neutral-800 text-gray-900 dark:text-white placeholder:text-gray-400 dark:placeholder:text-neutral-500 ${
+            error ? 'border-red-500' : 'border-gray-300 dark:border-neutral-600'
           }`}
         />
         {value && !isOpen && (
           <button
             type="button"
             onClick={handleClearSelection}
-            className="absolute right-3 top-1/2 -translate-y-1/2 text-gray-400 hover:text-gray-600"
+            className="absolute right-3 top-1/2 -translate-y-1/2 text-gray-400 dark:text-neutral-500 hover:text-gray-600 dark:hover:text-neutral-300"
           >
             ✕
           </button>
@@ -88,15 +88,15 @@ export const CitySelect: FC<CitySelectProps> = ({
       {error && <p className="text-sm text-red-500 mt-1">{error}</p>}
 
       {isOpen && (
-        <div className="absolute z-50 w-full mt-1 bg-white border border-gray-300 rounded-lg shadow-lg max-h-60 overflow-y-auto">
+        <div className="absolute z-50 w-full mt-1 bg-white dark:bg-neutral-800 border border-gray-300 dark:border-neutral-600 rounded-lg shadow-lg max-h-60 overflow-y-auto">
           {filteredCities.length > 0 ? (
             <ul className="py-1">
               {filteredCities.map((city) => (
                 <li
                   key={city}
                   onClick={() => handleSelectCity(city)}
-                  className={`px-3 py-2 cursor-pointer hover:bg-blue-50 ${
-                    value === city ? 'bg-blue-100 text-blue-700' : ''
+                  className={`px-3 py-2 cursor-pointer hover:bg-blue-50 dark:hover:bg-blue-900/30 ${
+                    value === city ? 'bg-blue-100 dark:bg-blue-900/40 text-blue-700 dark:text-blue-400' : 'text-gray-900 dark:text-neutral-200'
                   }`}
                 >
                   {city}
@@ -104,7 +104,7 @@ export const CitySelect: FC<CitySelectProps> = ({
               ))}
             </ul>
           ) : (
-            <div className="px-3 py-2 text-gray-500 text-sm">
+            <div className="px-3 py-2 text-gray-500 dark:text-neutral-400 text-sm">
               No cities found
             </div>
           )}
diff --git a/apps/hackathon/src/components/sidebar.tsx b/apps/hackathon/src/components/sidebar.tsx
index 7f38df9..6e16455 100644
--- a/apps/hackathon/src/components/sidebar.tsx
+++ b/apps/hackathon/src/components/sidebar.tsx
@@ -1,8 +1,9 @@
-import { FC, useState, useEffect } from 'react';
+import { FC, useEffect } from 'react';
 import { Link, useLocation } from 'react-router';
 import { useMyTeams, useAuthStore, supabase } from '@imphnen-frontend-service/service';
 import { useNavigate } from 'react-router';
 import { toast } from 'sonner';
+import { useTheme } from './theme-provider';
 
 interface NavItem {
   name: string;
@@ -21,6 +22,7 @@ export const Sidebar: FC<SidebarProps> = ({ isOpen = true, onClose }) => {
   const navigate = useNavigate();
   const { session, clearSession } = useAuthStore();
   const { data: teamsData } = useMyTeams();
+  const { theme, setTheme, resolvedTheme } = useTheme();
 
   const user = session?.user;
   const myTeams = teamsData?.data || [];
@@ -91,17 +93,51 @@ export const Sidebar: FC<SidebarProps> = ({ isOpen = true, onClose }) => {
     },
   ];
 
+  const cycleTheme = () => {
+    if (theme === 'light') setTheme('dark');
+    else if (theme === 'dark') setTheme('system');
+    else setTheme('light');
+  };
+
+  const getThemeIcon = () => {
+    if (theme === 'system') {
+      return (
+        <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9.75 17L9 20l-1 1h8l-1-1-.75-3M3 13h18M5 17h14a2 2 0 002-2V5a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z" />
+        </svg>
+      );
+    }
+    if (resolvedTheme === 'dark') {
+      return (
+        <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z" />
+        </svg>
+      );
+    }
+    return (
+      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z" />
+      </svg>
+    );
+  };
+
+  const getThemeLabel = () => {
+    if (theme === 'system') return 'System';
+    if (theme === 'dark') return 'Dark';
+    return 'Light';
+  };
+
   const sidebarContent = (
-    <div className="w-64 bg-white border-r min-h-screen flex flex-col">
+    <div className="w-64 bg-white dark:bg-neutral-900 border-r dark:border-neutral-700 min-h-screen flex flex-col">
       {/* Logo / Brand with Close Button */}
-      <div className="p-6 border-b flex items-center justify-between">
-        <h1 className="text-xl font-bold text-gray-900">🏆 Hackathon</h1>
+      <div className="p-6 border-b dark:border-neutral-700 flex items-center justify-between">
+        <h1 className="text-xl font-bold text-gray-900 dark:text-white">Hackathon</h1>
         {onClose && (
           <button
             onClick={onClose}
-            className="lg:hidden p-2 rounded-lg hover:bg-gray-100 transition-colors"
+            className="lg:hidden p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-neutral-800 transition-colors"
           >
-            <svg className="w-5 h-5 text-gray-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <svg className="w-5 h-5 text-gray-500 dark:text-neutral-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
             </svg>
           </button>
@@ -109,7 +145,7 @@ export const Sidebar: FC<SidebarProps> = ({ isOpen = true, onClose }) => {
       </div>
 
       {/* User Info */}
-      <div className="p-4 border-b">
+      <div className="p-4 border-b dark:border-neutral-700">
         <div className="flex items-center space-x-3">
           {user?.avatar ? (
             <img
@@ -118,15 +154,15 @@ export const Sidebar: FC<SidebarProps> = ({ isOpen = true, onClose }) => {
               className="w-10 h-10 rounded-full object-cover"
             />
           ) : (
-            <div className="w-10 h-10 rounded-full bg-gray-200 flex items-center justify-center">
-              <span className="text-gray-500 text-lg">👤</span>
+            <div className="w-10 h-10 rounded-full bg-gray-200 dark:bg-neutral-700 flex items-center justify-center">
+              <span className="text-gray-500 dark:text-neutral-400 text-lg">👤</span>
             </div>
           )}
           <div className="flex-1 min-w-0">
-            <p className="text-sm font-medium text-gray-900 truncate">
+            <p className="text-sm font-medium text-gray-900 dark:text-white truncate">
               {user?.fullname || user?.email?.split('@')[0] || 'User'}
             </p>
-            <p className="text-xs text-gray-500 truncate">{user?.email}</p>
+            <p className="text-xs text-gray-500 dark:text-neutral-400 truncate">{user?.email}</p>
           </div>
         </div>
       </div>
@@ -144,8 +180,8 @@ export const Sidebar: FC<SidebarProps> = ({ isOpen = true, onClose }) => {
                     to={item.path}
                     className={`flex items-center space-x-3 px-4 py-3 rounded-lg transition-colors ${
                       isActive
-                        ? 'bg-blue-50 text-blue-700 font-medium'
-                        : 'text-gray-700 hover:bg-gray-100'
+                        ? 'bg-blue-50 dark:bg-blue-900/30 text-blue-700 dark:text-blue-400 font-medium'
+                        : 'text-gray-700 dark:text-neutral-300 hover:bg-gray-100 dark:hover:bg-neutral-800'
                     }`}
                   >
                     {item.icon}
@@ -157,11 +193,18 @@ export const Sidebar: FC<SidebarProps> = ({ isOpen = true, onClose }) => {
         </ul>
       </nav>
 
-      {/* Logout Button */}
-      <div className="p-4 border-t">
+      {/* Theme Toggle & Logout */}
+      <div className="p-4 border-t dark:border-neutral-700 space-y-2">
+        <button
+          onClick={cycleTheme}
+          className="flex items-center space-x-3 px-4 py-3 w-full rounded-lg text-gray-700 dark:text-neutral-300 hover:bg-gray-100 dark:hover:bg-neutral-800 transition-colors"
+        >
+          {getThemeIcon()}
+          <span>{getThemeLabel()}</span>
+        </button>
         <button
           onClick={handleLogout}
-          className="flex items-center space-x-3 px-4 py-3 w-full rounded-lg text-red-600 hover:bg-red-50 transition-colors"
+          className="flex items-center space-x-3 px-4 py-3 w-full rounded-lg text-red-600 dark:text-red-400 hover:bg-red-50 dark:hover:bg-red-900/20 transition-colors"
         >
           <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
             <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 16l4-4m0 0l-4-4m4 4H7m6 4v1a3 3 0 01-3 3H6a3 3 0 01-3-3V7a3 3 0 013-3h4a3 3 0 013 3v1" />
diff --git a/apps/hackathon/src/components/theme-provider.tsx b/apps/hackathon/src/components/theme-provider.tsx
new file mode 100644
index 0000000..a0deecc
--- /dev/null
+++ b/apps/hackathon/src/components/theme-provider.tsx
@@ -0,0 +1,100 @@
+import { createContext, useContext, useEffect, useState, FC, ReactNode } from 'react';
+
+type Theme = 'light' | 'dark' | 'system';
+
+interface ThemeContextType {
+  theme: Theme;
+  setTheme: (theme: Theme) => void;
+  resolvedTheme: 'light' | 'dark';
+}
+
+const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
+
+const STORAGE_KEY = 'hackathon-theme';
+
+function getSystemTheme(): 'light' | 'dark' {
+  if (typeof window !== 'undefined') {
+    return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
+  }
+  return 'light';
+}
+
+interface ThemeProviderProps {
+  children: ReactNode;
+  defaultTheme?: Theme;
+}
+
+export const ThemeProvider: FC<ThemeProviderProps> = ({ children, defaultTheme = 'system' }) => {
+  const [theme, setThemeState] = useState<Theme>(() => {
+    if (typeof window !== 'undefined') {
+      const stored = localStorage.getItem(STORAGE_KEY) as Theme | null;
+      return stored || defaultTheme;
+    }
+    return defaultTheme;
+  });
+
+  const [resolvedTheme, setResolvedTheme] = useState<'light' | 'dark'>(() => {
+    if (theme === 'system') {
+      return getSystemTheme();
+    }
+    return theme;
+  });
+
+  const setTheme = (newTheme: Theme) => {
+    setThemeState(newTheme);
+    localStorage.setItem(STORAGE_KEY, newTheme);
+  };
+
+  useEffect(() => {
+    const root = document.documentElement;
+
+    // Calculate the resolved theme
+    const resolved = theme === 'system' ? getSystemTheme() : theme;
+    setResolvedTheme(resolved);
+
+    // Apply dark class to root
+    if (resolved === 'dark') {
+      root.classList.add('dark');
+    } else {
+      root.classList.remove('dark');
+    }
+  }, [theme]);
+
+  // Listen for system theme changes
+  useEffect(() => {
+    if (theme !== 'system') return;
+
+    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
+
+    const handleChange = (e: MediaQueryListEvent) => {
+      const newTheme = e.matches ? 'dark' : 'light';
+      setResolvedTheme(newTheme);
+
+      const root = document.documentElement;
+      if (newTheme === 'dark') {
+        root.classList.add('dark');
+      } else {
+        root.classList.remove('dark');
+      }
+    };
+
+    mediaQuery.addEventListener('change', handleChange);
+    return () => mediaQuery.removeEventListener('change', handleChange);
+  }, [theme]);
+
+  return (
+    <ThemeContext.Provider value={{ theme, setTheme, resolvedTheme }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+};
+
+export function useTheme() {
+  const context = useContext(ThemeContext);
+  if (context === undefined) {
+    throw new Error('useTheme must be used within a ThemeProvider');
+  }
+  return context;
+}
+
+export default ThemeProvider;
diff --git a/apps/hackathon/src/components/theme-toggle.tsx b/apps/hackathon/src/components/theme-toggle.tsx
new file mode 100644
index 0000000..41965c6
--- /dev/null
+++ b/apps/hackathon/src/components/theme-toggle.tsx
@@ -0,0 +1,63 @@
+import { FC } from 'react';
+import { useTheme } from './theme-provider';
+
+interface ThemeToggleProps {
+  className?: string;
+}
+
+// Sun icon for light mode
+const SunIcon = () => (
+  <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z" />
+  </svg>
+);
+
+// Moon icon for dark mode
+const MoonIcon = () => (
+  <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z" />
+  </svg>
+);
+
+// System icon (monitor)
+const SystemIcon = () => (
+  <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9.75 17L9 20l-1 1h8l-1-1-.75-3M3 13h18M5 17h14a2 2 0 002-2V5a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z" />
+  </svg>
+);
+
+export const ThemeToggle: FC<ThemeToggleProps> = ({ className = '' }) => {
+  const { theme, setTheme, resolvedTheme } = useTheme();
+
+  const cycleTheme = () => {
+    if (theme === 'light') setTheme('dark');
+    else if (theme === 'dark') setTheme('system');
+    else setTheme('light');
+  };
+
+  const getThemeLabel = () => {
+    if (theme === 'system') return 'System';
+    return theme === 'dark' ? 'Dark' : 'Light';
+  };
+
+  const renderIcon = () => {
+    if (theme === 'system') {
+      return <SystemIcon />;
+    }
+    return resolvedTheme === 'dark' ? <MoonIcon /> : <SunIcon />;
+  };
+
+  return (
+    <button
+      type="button"
+      onClick={cycleTheme}
+      className={`p-2 rounded-lg hover:bg-gray-100 dark:hover:bg-neutral-800 transition-colors cursor-pointer text-gray-600 dark:text-neutral-400 ${className}`}
+      title={`Theme: ${getThemeLabel()}`}
+      aria-label={`Current theme: ${getThemeLabel()}. Click to change.`}
+    >
+      {renderIcon()}
+    </button>
+  );
+};
+
+export default ThemeToggle;
diff --git a/apps/hackathon/src/index.css b/apps/hackathon/src/index.css
index 8b9a7b4..8272c15 100644
--- a/apps/hackathon/src/index.css
+++ b/apps/hackathon/src/index.css
@@ -2,6 +2,9 @@
 @import 'tailwindcss';
 @source "../../../libs/ui/**/*.{ts,tsx}";
 
+/* Enable class-based dark mode (using .dark class on html element) */
+@custom-variant dark (&:where(.dark, .dark *));
+
 @theme {
   --color-primary-50: #f0f8ff;
   --color-primary-100: #e1f0fd;
@@ -108,6 +111,14 @@
     border-color: var(--color-neutral-200, currentColor);
   }
 
+  .dark *,
+  .dark ::after,
+  .dark ::before,
+  .dark ::backdrop,
+  .dark ::file-selector-button {
+    border-color: var(--color-neutral-700, currentColor);
+  }
+
   /* Custom scrollbar */
   ::-webkit-scrollbar {
     width: 6px;
@@ -118,19 +129,41 @@
     background: var(--color-neutral-50);
   }
 
+  .dark ::-webkit-scrollbar-track {
+    background: var(--color-neutral-900);
+  }
+
   ::-webkit-scrollbar-thumb {
     background: #cccccc;
     border-radius: 3px;
   }
 
+  .dark ::-webkit-scrollbar-thumb {
+    background: var(--color-neutral-600);
+  }
+
   ::-webkit-scrollbar-thumb:hover {
     background: var(--color-neutral-300);
   }
 
+  .dark ::-webkit-scrollbar-thumb:hover {
+    background: var(--color-neutral-500);
+  }
+
   html {
     font-family: 'Bai Jamjuree', sans-serif;
     font-weight: 400;
     font-size: 16px;
     line-height: 1.2;
   }
+
+  /* Dark mode base styles */
+  .dark {
+    color-scheme: dark;
+  }
+
+  .dark body {
+    background-color: var(--color-neutral-950);
+    color: var(--color-neutral-100);
+  }
 }
diff --git a/apps/hackathon/src/main.tsx b/apps/hackathon/src/main.tsx
index 0d7eaf2..cf245f4 100644
--- a/apps/hackathon/src/main.tsx
+++ b/apps/hackathon/src/main.tsx
@@ -9,6 +9,7 @@ import {
   QueryProvider,
 } from '@imphnen-frontend-service/utils';
 import { Toaster } from 'sonner';
+import { ThemeProvider } from './components/theme-provider';
 import './index.css';
 
 const files = import.meta.glob('./app/**/*(page|layout).tsx');
@@ -36,11 +37,13 @@ if (!rootElement) throw new Error('Failed to find the root element');
 
 createRoot(rootElement).render(
   <StrictMode>
-    <QueryProvider>
-      <ModalLoginProvider>
-        <Toaster position="top-right" />
-        <RouterProvider router={router} />
-      </ModalLoginProvider>
-    </QueryProvider>
+    <ThemeProvider defaultTheme="system">
+      <QueryProvider>
+        <ModalLoginProvider>
+          <Toaster position="top-right" richColors />
+          <RouterProvider router={router} />
+        </ModalLoginProvider>
+      </QueryProvider>
+    </ThemeProvider>
   </StrictMode>
 );