diff --git a/src/app.html b/src/app.html
index b5bbbd8..3f1e509 100644
--- a/src/app.html
+++ b/src/app.html
@@ -4,6 +4,16 @@
 <head>
 	<meta charset="utf-8" />
 	<meta name="viewport" content="width=device-width, initial-scale=1" />
+	<script>
+		(function () {
+			const theme = localStorage.getItem('theme');
+			if (theme === 'dark' || (!theme && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+				document.documentElement.classList.add('dark');
+			} else {
+				document.documentElement.classList.remove('dark');
+			}
+		})();
+	</script>
 	%sveltekit.head%
 </head>
 
diff --git a/src/lib/components/ui/topBar/TopBar.svelte b/src/lib/components/ui/topBar/TopBar.svelte
index 2c9a7cc..0e1b2ef 100644
--- a/src/lib/components/ui/topBar/TopBar.svelte
+++ b/src/lib/components/ui/topBar/TopBar.svelte
@@ -1,28 +1,49 @@
 <script lang="ts">
 	import { authClient } from '$lib/auth-client';
 	import { canAccessAdmin } from '$lib/svelte-admin/roles';
+	import { onMount } from 'svelte';
 
 	let { userRoleId = null }: { userRoleId: number | null } = $props();
 	const session = authClient.useSession();
 	let isAdmin = $derived(canAccessAdmin(userRoleId));
+
+	let dark = $state(false);
+
+	onMount(() => {
+		dark = document.documentElement.classList.contains('dark');
+	});
+
+	function toggleTheme() {
+		dark = !dark;
+		if (dark) {
+			document.documentElement.classList.add('dark');
+			localStorage.setItem('theme', 'dark');
+		} else {
+			document.documentElement.classList.remove('dark');
+			localStorage.setItem('theme', 'light');
+		}
+	}
 </script>
 
-<nav class="flex w-full justify-between px-8 py-6">
+<nav class="flex w-full items-center justify-between px-8 py-6">
 	<span><a href="/">Rhema Wave Technologies</a></span>
-	{#if $session.data}
-		<div>
+	<div class="flex items-center gap-4">
+		<button onclick={toggleTheme} class="border px-3 py-1 text-sm">
+			{dark ? 'Light' : 'Dark'}
+		</button>
+		{#if $session.data}
 			{#if isAdmin}
-				<a href="/admin" class="mx-2">Admin Panel</a>
+				<a href="/admin">Admin Panel</a>
 			{/if}
-			<a href="/dashboard" class="mx-2">Dashboard</a>
+			<a href="/dashboard">Dashboard</a>
 			<button
 				onclick={async () => {
 					await authClient.signOut();
 					window.location.href = '/';
 				}}>Log Out</button
 			>
-		</div>
-	{:else}
-		<span><a href="/login">Log In</a> | <a href="/register">Register</a></span>
-	{/if}
+		{:else}
+			<span><a href="/login">Log In</a> | <a href="/register">Register</a></span>
+		{/if}
+	</div>
 </nav>
diff --git a/src/routes/layout.css b/src/routes/layout.css
index b66f9a6..8b7344b 100644
--- a/src/routes/layout.css
+++ b/src/routes/layout.css
@@ -2,64 +2,62 @@
 @plugin '@tailwindcss/forms';
 @plugin '@tailwindcss/typography';
 
+/* Use class-based dark mode instead of prefers-color-scheme */
+@custom-variant dark (&:where(.dark, .dark *));
+
 /* ------------------------------------------------------------------ */
-/*  Wireframe theme — remap all non-gray colors to grayscale           */
+/*  Wireframe base — remap all non-gray colors to grayscale            */
+/*  Use var(--color-gray-N) so dark-mode inversion flows through       */
 /* ------------------------------------------------------------------ */
 @theme {
-  /* blue → gray */
-  --color-blue-50: #f3f4f6;
-  --color-blue-100: #e5e7eb;
-  --color-blue-200: #d1d5db;
-  --color-blue-300: #9ca3af;
-  --color-blue-400: #6b7280;
-  --color-blue-500: #6b7280;
-  --color-blue-600: #4b5563;
-  --color-blue-700: #374151;
-  --color-blue-800: #1f2937;
-  /* green → gray */
-  --color-green-50: #f3f4f6;
-  --color-green-100: #e5e7eb;
-  --color-green-200: #d1d5db;
-  --color-green-300: #9ca3af;
-  --color-green-400: #6b7280;
-  --color-green-500: #6b7280;
-  --color-green-600: #4b5563;
-  --color-green-700: #374151;
-  --color-green-800: #1f2937;
-  /* red → gray */
-  --color-red-50: #f3f4f6;
-  --color-red-100: #e5e7eb;
-  --color-red-200: #d1d5db;
-  --color-red-300: #9ca3af;
-  --color-red-400: #6b7280;
-  --color-red-500: #6b7280;
-  --color-red-600: #4b5563;
-  --color-red-700: #374151;
-  --color-red-800: #1f2937;
-  /* purple → gray */
-  --color-purple-50: #f3f4f6;
-  --color-purple-100: #e5e7eb;
-  --color-purple-200: #d1d5db;
-  --color-purple-300: #9ca3af;
-  --color-purple-400: #6b7280;
-  --color-purple-500: #6b7280;
-  --color-purple-600: #4b5563;
-  --color-purple-700: #374151;
-  --color-purple-800: #1f2937;
-  --color-purple-900: #111827;
-  /* slate → gray */
-  --color-slate-50: #f8fafc;
-  --color-slate-100: #f1f5f9;
-  --color-slate-200: #e2e8f0;
-  --color-slate-300: #cbd5e1;
-  --color-slate-400: #94a3b8;
-  --color-slate-500: #64748b;
-  --color-slate-600: #475569;
-  --color-slate-700: #334155;
-  --color-slate-800: #1e293b;
-  --color-slate-900: #111827;
+  --color-blue-50: var(--color-gray-100);
+  --color-blue-100: var(--color-gray-200);
+  --color-blue-200: var(--color-gray-300);
+  --color-blue-300: var(--color-gray-400);
+  --color-blue-400: var(--color-gray-500);
+  --color-blue-500: var(--color-gray-500);
+  --color-blue-600: var(--color-gray-600);
+  --color-blue-700: var(--color-gray-700);
+  --color-blue-800: var(--color-gray-800);
+  --color-green-50: var(--color-gray-100);
+  --color-green-100: var(--color-gray-200);
+  --color-green-200: var(--color-gray-300);
+  --color-green-300: var(--color-gray-400);
+  --color-green-400: var(--color-gray-500);
+  --color-green-500: var(--color-gray-500);
+  --color-green-600: var(--color-gray-600);
+  --color-green-700: var(--color-gray-700);
+  --color-green-800: var(--color-gray-800);
+  --color-red-50: var(--color-gray-100);
+  --color-red-100: var(--color-gray-200);
+  --color-red-200: var(--color-gray-300);
+  --color-red-300: var(--color-gray-400);
+  --color-red-400: var(--color-gray-500);
+  --color-red-500: var(--color-gray-500);
+  --color-red-600: var(--color-gray-600);
+  --color-red-700: var(--color-gray-700);
+  --color-red-800: var(--color-gray-800);
+  --color-purple-50: var(--color-gray-100);
+  --color-purple-100: var(--color-gray-200);
+  --color-purple-200: var(--color-gray-300);
+  --color-purple-300: var(--color-gray-400);
+  --color-purple-400: var(--color-gray-500);
+  --color-purple-500: var(--color-gray-500);
+  --color-purple-600: var(--color-gray-600);
+  --color-purple-700: var(--color-gray-700);
+  --color-purple-800: var(--color-gray-800);
+  --color-purple-900: var(--color-gray-900);
+  --color-slate-50: var(--color-gray-50);
+  --color-slate-100: var(--color-gray-100);
+  --color-slate-200: var(--color-gray-200);
+  --color-slate-300: var(--color-gray-300);
+  --color-slate-400: var(--color-gray-400);
+  --color-slate-500: var(--color-gray-500);
+  --color-slate-600: var(--color-gray-600);
+  --color-slate-700: var(--color-gray-700);
+  --color-slate-800: var(--color-gray-800);
+  --color-slate-900: var(--color-gray-900);
 
-  /* zero out decorative radii */
   --radius: 0px;
   --radius-sm: 0px;
   --radius-md: 0px;
@@ -68,7 +66,6 @@
   --radius-2xl: 0px;
   --radius-3xl: 0px;
 
-  /* zero out shadows */
   --shadow-sm: 0 0 #0000;
   --shadow: 0 0 #0000;
   --shadow-md: 0 0 #0000;
@@ -77,6 +74,22 @@
   --shadow-2xl: 0 0 #0000;
 }
 
+/* ------------------------------------------------------------------ */
+/*  Dark mode — invert the gray scale                                  */
+/* ------------------------------------------------------------------ */
+.dark {
+  --color-gray-50: #030712;
+  --color-gray-100: #111827;
+  --color-gray-200: #1f2937;
+  --color-gray-300: #374151;
+  --color-gray-400: #4b5563;
+  --color-gray-500: #6b7280;
+  --color-gray-600: #9ca3af;
+  --color-gray-700: #d1d5db;
+  --color-gray-800: #e5e7eb;
+  --color-gray-900: #f9fafb;
+}
+
 /* ------------------------------------------------------------------ */
 /*  Force-disable transitions, animations, and remaining decoration    */
 /* ------------------------------------------------------------------ */