diff --git a/src/components/blocks/navBar.astro b/src/components/blocks/navBar.astro
index 344984f..677cec8 100644
--- a/src/components/blocks/navBar.astro
+++ b/src/components/blocks/navBar.astro
@@ -1,10 +1,11 @@
 ---
 import VerticalNav from "./verticalNav.astro";
 import SearchModal from "../ui/SearchModal.astro";
+import ThemeToggle from "../ui/ThemeToggle.astro";
 ---
 
 <div
-	class="w-full backdrop-blur fixed top-0 text-white bg-secondary/75 z-[60] text-lg py-3 h-[var(--header-height)]"
+	class="site-nav w-full backdrop-blur fixed top-0 z-[60] text-lg py-3 h-[var(--header-height)]"
 	data-pagefind-ignore
 >
 	<div
@@ -21,7 +22,7 @@ import SearchModal from "../ui/SearchModal.astro";
 		<!-- Vertical Navbar -->
 		<aside
 			id="vertical-navbar"
-			class="sidebar fixed block overflow-y-auto duration-300 z-[60] lg:hidden bg-[#151515] py-8 px-8 h-[calc(100vh-var(--header-height))] top-[--header-height] left-0 w-full"
+			class="sidebar fixed block overflow-y-auto duration-300 z-[60] lg:hidden py-8 px-8 h-[calc(100vh-var(--header-height))] top-[--header-height] left-0 w-full"
 			transition:persist="vertical-nav-from-left"
 		>
 			<VerticalNav showHome={true} />
@@ -47,29 +48,32 @@ import SearchModal from "../ui/SearchModal.astro";
 			transition:name="navbar"
 		>
 			<a
-				class="no-target-blank hover:text-black hover:bg-white rounded-md transition-colors duration-300 px-2 py-1 text-white hover:no-underline"
+				class="no-target-blank nav-link rounded-md transition-colors duration-300 px-2 py-1 hover:no-underline"
 				href="/get-started/introduction">Get started</a
 			>
 			<a
-				class="no-target-blank hover:text-black hover:bg-white rounded-md transition-colors duration-300 px-2 py-1 text-white hover:no-underline"
+				class="no-target-blank nav-link rounded-md transition-colors duration-300 px-2 py-1 hover:no-underline"
 				href="/guide/general-tips">Guide</a
 			>
 			<a
-				class="no-target-blank hover:text-black hover:bg-white rounded-md transition-colors duration-300 px-2 py-1 text-white hover:no-underline"
+				class="no-target-blank nav-link rounded-md transition-colors duration-300 px-2 py-1 hover:no-underline"
 				href="/games">Games</a
 			>
 			<a
-				class="no-target-blank hover:text-black hover:bg-white rounded-md transition-colors duration-300 px-2 py-1 text-white hover:no-underline"
+				class="no-target-blank nav-link rounded-md transition-colors duration-300 px-2 py-1 hover:no-underline"
 				href="/groups">Groups</a
 			>
 			<a
-				class="no-target-blank hover:text-black hover:bg-white rounded-md transition-colors duration-300 px-2 py-1 text-white hover:no-underline"
+				class="no-target-blank nav-link rounded-md transition-colors duration-300 px-2 py-1 hover:no-underline"
 				href="/credits">Credits</a
 			>
 		</div>
 		<!-- Search bar -->
-		<div class="hidden lg:flex lg:flex-1 justify-end relative">
+		<div class="flex lg:flex-1 justify-end items-center gap-3 relative">
+			<div class="hidden lg:block">
 			<SearchModal id="searchModal" open="Open modal" />
+			</div>
+			<ThemeToggle />
 		</div>
 	</div>
 </div>
@@ -99,6 +103,34 @@ import SearchModal from "../ui/SearchModal.astro";
 		);
 	}
 
+	.site-nav {
+		background: var(--nav-background);
+		color: var(--text-color);
+		border-bottom: 1px solid color-mix(in srgb, var(--border-color) 55%, transparent);
+	}
+
+	.site-nav .sidebar {
+		background: var(--sidebar-background);
+	}
+
+	.site-nav a {
+		color: var(--text-color);
+	}
+
+	.site-nav .nav-link:hover {
+		background: var(--control-hover);
+	}
+
+	html[data-theme="light"] {
+		--pagefind-ui-primary: #171717;
+		--pagefind-ui-text: #171717;
+		--pagefind-ui-background: #ffffff;
+		--pagefind-ui-border: #cbd5e1;
+		--pagefind-ui-tag: #171717;
+		--foreground: #171717;
+		--background: #171717;
+	}
+
 	.hamburger-menu {
 		--x-width: calc(var(--hamburger-height) * 1.41421356237);
 
diff --git a/src/components/ui/HeroTitle.astro b/src/components/ui/HeroTitle.astro
index f0b298d..fb96cce 100644
--- a/src/components/ui/HeroTitle.astro
+++ b/src/components/ui/HeroTitle.astro
@@ -1,6 +1,6 @@
 <div class="flex flex-col">
 	<div class="text-center text-4xl lg:text-6xl font-bold">
-		<span class="text-slate-200">Getting started with</span>
+		<span class="text-[var(--text-color)]">Getting started with</span>
 		<div
 			id="coworking-streams"
 			class="text-transparent animate-gradient py-1 lg:py-3 bg-[length:300%]"
diff --git a/src/components/ui/SearchModal.astro b/src/components/ui/SearchModal.astro
index 0286e4e..f5e5657 100644
--- a/src/components/ui/SearchModal.astro
+++ b/src/components/ui/SearchModal.astro
@@ -15,7 +15,7 @@ const { id } = Astro.props;
 
 <button
 	onclick={`window.${id}.showModal()`}
-	class="text-sm flex bg-[#101010] w-60 px-2 py-2 border border-gray-600 border-solid text-left rounded-lg group"
+	class="search-trigger text-sm flex w-60 px-2 py-2 border border-solid text-left rounded-lg group"
 >
 	<svg
 		xmlns="http://www.w3.org/2000/svg"
@@ -33,7 +33,7 @@ const { id } = Astro.props;
 
 <dialog
 	id=`${id}`
-	class="fixed left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 bg-[#202020] border-2 border-solid border-[#505050] text-white rounded-lg w-4/5 lg:w-1/2 h-5/6 px-10 py-10 animate-fadeIn"
+	class="search-dialog fixed left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 border-2 border-solid rounded-lg w-4/5 lg:w-1/2 h-5/6 px-10 py-10 animate-fadeIn"
 >
 	<form method="dialog">
 		<button class="absolute top-3 right-3"
@@ -52,3 +52,17 @@ const { id } = Astro.props;
 	</form>
 	<div id=`${id}-search` class="mt-2"></div>
 </dialog>
+
+<style>
+	.search-trigger {
+		background: var(--control-background);
+		border-color: var(--border-color);
+		color: var(--text-color);
+	}
+
+	.search-dialog {
+		background: var(--surface-color);
+		border-color: var(--border-color);
+		color: var(--text-color);
+	}
+</style>
diff --git a/src/components/ui/ThemeToggle.astro b/src/components/ui/ThemeToggle.astro
new file mode 100644
index 0000000..0c58071
--- /dev/null
+++ b/src/components/ui/ThemeToggle.astro
@@ -0,0 +1,115 @@
+<button
+	type="button"
+	class="theme-toggle"
+	aria-label="Switch to light theme"
+	title="Switch to light theme"
+>
+	<svg
+		class="sun-icon"
+		xmlns="http://www.w3.org/2000/svg"
+		viewBox="0 0 24 24"
+		fill="none"
+		stroke="currentColor"
+		stroke-width="2"
+		stroke-linecap="round"
+		stroke-linejoin="round"
+		aria-hidden="true"
+	>
+		<circle cx="12" cy="12" r="4"></circle>
+		<path d="M12 2v2M12 20v2M4.93 4.93l1.42 1.42M17.66 17.66l1.41 1.41M2 12h2M20 12h2M4.93 19.07l1.42-1.42M17.66 6.34l1.41-1.41"></path>
+	</svg>
+	<svg
+		class="moon-icon"
+		xmlns="http://www.w3.org/2000/svg"
+		viewBox="0 0 24 24"
+		fill="none"
+		stroke="currentColor"
+		stroke-width="2"
+		stroke-linecap="round"
+		stroke-linejoin="round"
+		aria-hidden="true"
+	>
+		<path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79Z"></path>
+	</svg>
+</button>
+
+<script is:inline>
+	(() => {
+		const updateThemeToggle = () => {
+			const button = document.querySelector(".theme-toggle");
+			if (!button) return;
+
+			const isDark = document.documentElement.dataset.theme === "dark";
+			const nextTheme = isDark ? "light" : "dark";
+			button.setAttribute("aria-label", `Switch to ${nextTheme} theme`);
+			button.setAttribute("title", `Switch to ${nextTheme} theme`);
+		};
+
+		if (!window.__themeToggleReady) {
+			document.addEventListener("click", (event) => {
+				const button = event.target.closest(".theme-toggle");
+				if (!button) return;
+
+				const theme =
+					document.documentElement.dataset.theme === "dark"
+						? "light"
+						: "dark";
+				document.documentElement.dataset.theme = theme;
+				document.documentElement.style.colorScheme = theme;
+				localStorage.setItem("theme", theme);
+				updateThemeToggle();
+			});
+			window.__themeToggleReady = true;
+		}
+
+		document.addEventListener("astro:page-load", updateThemeToggle);
+		updateThemeToggle();
+	})();
+</script>
+
+<style>
+	.theme-toggle {
+		display: grid;
+		width: 2.25rem;
+		height: 2.25rem;
+		flex: 0 0 auto;
+		place-items: center;
+		border: 1px solid var(--border-color);
+		border-radius: 0.5rem;
+		background: var(--control-background);
+		color: var(--text-color);
+		cursor: pointer;
+		transition:
+			background-color 150ms ease,
+			border-color 150ms ease,
+			transform 150ms ease;
+	}
+
+	.theme-toggle:hover {
+		background: var(--control-hover);
+	}
+
+	.theme-toggle:active {
+		transform: scale(0.94);
+	}
+
+	.theme-toggle:focus-visible {
+		outline: 2px solid #3f84d8;
+		outline-offset: 2px;
+	}
+
+	.theme-toggle svg {
+		width: 1.25rem;
+		height: 1.25rem;
+		grid-area: 1 / 1;
+	}
+
+	.sun-icon,
+	:global(html[data-theme="light"]) .moon-icon {
+		display: none;
+	}
+
+	:global(html[data-theme="light"]) .sun-icon {
+		display: block;
+	}
+</style>
diff --git a/src/components/ui/card-hover-effect.tsx b/src/components/ui/card-hover-effect.tsx
index 52551d0..46c895b 100644
--- a/src/components/ui/card-hover-effect.tsx
+++ b/src/components/ui/card-hover-effect.tsx
@@ -67,7 +67,7 @@ export const Card = ({
     return (
         <div
             className={cn(
-                "relative z-20 h-full w-full overflow-hidden rounded-2xl border border-transparent bg-[#232323] p-4 group-hover:border-slate-700 dark:border-white/[0.2]",
+                "relative z-20 h-full w-full overflow-hidden rounded-2xl border border-[var(--card-border)] bg-[var(--card-background)] p-4 shadow-sm group-hover:border-[var(--card-border-hover)]",
                 className,
             )}
         >
@@ -87,7 +87,7 @@ export const CardTitle = ({
     return (
         <h4
             className={cn(
-                "mt-4 font-bold tracking-wide text-zinc-100 text-xl",
+                "mt-4 font-bold tracking-wide text-[var(--text-color)] text-xl",
                 className,
             )}
         >
@@ -105,7 +105,7 @@ export const CardDescription = ({
     return (
         <p
             className={cn(
-                "mt-5 text-sm leading-relaxed tracking-wide text-zinc-400",
+                "mt-5 text-sm leading-relaxed tracking-wide text-[var(--muted-text)]",
                 className,
             )}
         >
diff --git a/src/layouts/Layout.astro b/src/layouts/Layout.astro
index 053f844..8d8c976 100644
--- a/src/layouts/Layout.astro
+++ b/src/layouts/Layout.astro
@@ -11,7 +11,7 @@ const { title, description } = Astro.props;
 ---
 
 <!doctype html>
-<html lang="en">
+<html lang="en" data-theme="dark">
 	<head>
 		<meta charset="UTF-8" />
 		<meta name="description" content={description} />
@@ -48,6 +48,34 @@ const { title, description } = Astro.props;
 
 		<link rel="icon" type="image/x-icon" href="/favicon.ico" />
 		<link href="/pagefind/pagefind-ui.css" rel="stylesheet" />
+		<script is:inline>
+			(() => {
+				const applyTheme = (root) => {
+					const savedTheme = localStorage.getItem("theme");
+					const theme =
+						savedTheme === "light" || savedTheme === "dark"
+							? savedTheme
+							: window.matchMedia("(prefers-color-scheme: dark)")
+									.matches
+								? "dark"
+								: "light";
+					root.dataset.theme = theme;
+					root.style.colorScheme = theme;
+				};
+
+				applyTheme(document.documentElement);
+
+				if (!window.__themePersistenceReady) {
+					document.addEventListener("astro:before-swap", (event) => {
+						applyTheme(event.newDocument.documentElement);
+					});
+					document.addEventListener("astro:after-swap", () => {
+						applyTheme(document.documentElement);
+					});
+					window.__themePersistenceReady = true;
+				}
+			})();
+		</script>
 		<script src="/pagefind/pagefind-ui.js" is:inline></script>
 		<script is:inline src="/_vercel/insights/script.js"></script>
 		<ClientRouter />
@@ -74,8 +102,8 @@ const { title, description } = Astro.props;
 
 			html {
 				font-family: system-ui, sans-serif;
-				background-color: #171717;
-				color: rgb(255 255 255);
+				background-color: var(--background-color);
+				color: var(--text-color);
 			}
 
 			html,
diff --git a/src/styles/global.css b/src/styles/global.css
index 27624d8..7d6a21a 100644
--- a/src/styles/global.css
+++ b/src/styles/global.css
@@ -1,5 +1,55 @@
 @import "tailwindcss";
 
+:root,
+html[data-theme="dark"] {
+    --background-color: #171717;
+    --surface-color: #202020;
+    --nav-background: rgb(23 23 23 / 0.82);
+    --sidebar-background: #151515;
+    --control-background: #101010;
+    --control-hover: #2f2f2f;
+    --text-color: #ffffff;
+    --muted-text: #9ca3af;
+    --border-color: #505050;
+    --card-background: #232323;
+    --card-border: rgb(255 255 255 / 0.2);
+    --card-border-hover: #334155;
+}
+
+html[data-theme="light"] {
+    --background-color: #f8fafc;
+    --surface-color: #ffffff;
+    --nav-background: rgb(255 255 255 / 0.86);
+    --sidebar-background: #f8fafc;
+    --control-background: #ffffff;
+    --control-hover: #e2e8f0;
+    --text-color: #171717;
+    --muted-text: #4b5563;
+    --border-color: #cbd5e1;
+    --card-background: #ffffff;
+    --card-border: #cbd5e1;
+    --card-border-hover: #94a3b8;
+}
+
+html,
+body {
+    transition:
+        background-color 180ms ease,
+        color 180ms ease;
+}
+
+html[data-theme="light"] .text-white {
+    color: var(--text-color);
+}
+
+html[data-theme="light"] .text-gray-400 {
+    color: var(--muted-text);
+}
+
+html[data-theme="light"] .guide-content code {
+    background-color: #e2e8f0;
+}
+
 @theme {
     --color-primary: #fafafa;
     --color-secondary: #171717;