diff --git a/src/components/Computer.svelte b/src/components/Computer.svelte
index bc9b167..86a9d97 100644
--- a/src/components/Computer.svelte
+++ b/src/components/Computer.svelte
@@ -98,7 +98,7 @@
 	});
 </script>
 
-<div class="relative transition-all duration-300 delay-200 starting:opacity-0 starting:translate-y-4">
+<div class="relative transition-[translate,opacity] duration-300 delay-200 starting:opacity-0 starting:translate-y-4">
 	<div class="flex justify-center items-center absolute -top-2 right-2 z-0">
 		<div class="w-4 h-4 rounded-full {online ? 'bg-green' : 'bg-red'}"></div>
 		<div class="w-4 h-4 rounded-full absolute animate-duration-2s animate-delay-2s {online ? 'bg-green animate-ping' : 'bg-red'}"></div>
diff --git a/src/components/Music.svelte b/src/components/Music.svelte
index 0494f53..f5eb1e7 100644
--- a/src/components/Music.svelte
+++ b/src/components/Music.svelte
@@ -26,7 +26,7 @@
 	});
 </script>
 
-<div class="relative transition-all duration-300 delay-100 starting:opacity-0 starting:translate-y-4">
+<div class="relative transition-[translate,opacity] duration-300 delay-100 starting:opacity-0 starting:translate-y-4">
 	<div class="flex justify-center items-center absolute -top-2 right-2 z-0">
 		<div class="w-4 h-4 rounded-full {playing ? 'bg-green' : 'bg-red'}"></div>
 		<div class="w-4 h-4 rounded-full absolute animate-duration-2s animate-delay-2s {playing ? 'bg-green animate-ping' : 'bg-red'}"></div>
diff --git a/src/components/Projects.svelte b/src/components/Projects.svelte
index b8f94c7..65c90ba 100644
--- a/src/components/Projects.svelte
+++ b/src/components/Projects.svelte
@@ -133,7 +133,7 @@
 	</div>
 {/snippet}
 
-<div class="grid grid-cols-2 gap-4 max-sm:grid-cols-1 transition-all duration-300 delay-300 starting:opacity-0 starting:translate-y-4">
+<div class="grid grid-cols-2 gap-4 max-sm:grid-cols-1 transition-[translate,opacity] duration-300 delay-300 starting:opacity-0 starting:translate-y-4">
 	{@render projectColumn(leftColumn)}
 	{@render projectColumn(rightColumn)}
 </div>
diff --git a/src/components/ThemeButton.svelte b/src/components/ThemeButton.svelte
new file mode 100644
index 0000000..445fa97
--- /dev/null
+++ b/src/components/ThemeButton.svelte
@@ -0,0 +1,31 @@
+<script lang="ts">
+	let isDarkMode = $state(true);
+
+	function onClick() {
+		const toggle = () => {
+			isDarkMode = !isDarkMode;
+			document.documentElement.dataset.theme = isDarkMode ? "dark" : "light";
+		};
+
+		if (!document.startViewTransition) toggle();
+		document.startViewTransition(toggle);
+	}
+</script>
+
+<button onclick={onClick} aria-label="Toggle dark mode" class="absolute top-8 right-8 cursor-pointer">
+	{#if isDarkMode}
+		<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" class="size-12"
+			><path
+				fill="currentColor"
+				d="M12 1.992a10 10 0 1 0 9.236 13.838c.341-.82-.476-1.644-1.298-1.31a6.5 6.5 0 0 1-6.864-10.787l.077-.08c.551-.63.113-1.653-.758-1.653h-.266l-.068-.006z"
+			/></svg
+		>
+	{:else}
+		<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" class="size-12"
+			><path
+				fill="currentColor"
+				d="M12 19a1 1 0 0 1 .993.883L13 20v1a1 1 0 0 1-1.993.117L11 21v-1a1 1 0 0 1 1-1m6.313-2.09l.094.083l.7.7a1 1 0 0 1-1.32 1.497l-.094-.083l-.7-.7a1 1 0 0 1 1.218-1.567zm-11.306.083a1 1 0 0 1 .083 1.32l-.083.094l-.7.7a1 1 0 0 1-1.497-1.32l.083-.094l.7-.7a1 1 0 0 1 1.414 0M4 11a1 1 0 0 1 .117 1.993L4 13H3a1 1 0 0 1-.117-1.993L3 11zm17 0a1 1 0 0 1 .117 1.993L21 13h-1a1 1 0 0 1-.117-1.993L20 11zM6.213 4.81l.094.083l.7.7a1 1 0 0 1-1.32 1.497l-.094-.083l-.7-.7A1 1 0 0 1 6.11 4.74zm12.894.083a1 1 0 0 1 .083 1.32l-.083.094l-.7.7a1 1 0 0 1-1.497-1.32l.083-.094l.7-.7a1 1 0 0 1 1.414 0M12 2a1 1 0 0 1 .993.883L13 3v1a1 1 0 0 1-1.993.117L11 4V3a1 1 0 0 1 1-1m0 5a5 5 0 1 1-4.995 5.217L7 12l.005-.217A5 5 0 0 1 12 7"
+			/></svg
+		>
+	{/if}
+</button>
diff --git a/src/components/Tools.astro b/src/components/Tools.astro
index 2da30ed..e68e88c 100644
--- a/src/components/Tools.astro
+++ b/src/components/Tools.astro
@@ -16,7 +16,7 @@ import DockerIcon from "../assets/icons/coding/docker.svg";
 import LinuxIcon from "../assets/icons/coding/linux.svg";
 ---
 
-<section class="mb-0! transition-all duration-300 delay-200 starting:opacity-0 starting:translate-y-4">
+<section class="mb-0! transition-[translate,opacity] duration-300 delay-200 starting:opacity-0 starting:translate-y-4">
 	<legend>tools</legend>
 
 	<!-- separator -->
@@ -26,9 +26,7 @@ import LinuxIcon from "../assets/icons/coding/linux.svg";
 		<hr class="grow border-surface0" />
 	</div>
 
-	<div
-		class="flex flex-wrap gap-1 mb-4 *:bg-surface0/50 *:shadow *:border *:border-surface1/50 *:rounded-md *:p-1.5 *:text-sm *:flex *:items-center *:gap-1.5"
-	>
+	<div class="flex flex-wrap gap-1 mb-4 *:bg-surface0/50 *:shadow *:border *:border-surface1/50 *:rounded-md *:p-1.5 *:text-sm *:flex *:items-center *:gap-1.5">
 		<div>
 			<VSCodiumIcon class="size-5" />
 			<span>VSCodium</span>
@@ -46,9 +44,7 @@ import LinuxIcon from "../assets/icons/coding/linux.svg";
 		<hr class="grow border-surface0" />
 	</div>
 
-	<div
-		class="flex flex-wrap gap-1 mb-4 *:bg-surface0/50 *:shadow *:border *:border-surface1/50 *:rounded-md *:p-1.5 *:text-sm *:flex *:items-center *:gap-1.5"
-	>
+	<div class="flex flex-wrap gap-1 mb-4 *:bg-surface0/50 *:shadow *:border *:border-surface1/50 *:rounded-md *:p-1.5 *:text-sm *:flex *:items-center *:gap-1.5">
 		<div>
 			<TypeScriptIcon class="size-5" />
 			<span>TypeScript</span>
@@ -78,9 +74,7 @@ import LinuxIcon from "../assets/icons/coding/linux.svg";
 		<hr class="grow border-surface0" />
 	</div>
 
-	<div
-		class="flex flex-wrap gap-1 mb-4 *:bg-surface0/50 *:shadow *:border *:border-surface1/50 *:rounded-md *:p-1.5 *:text-sm *:flex *:items-center *:gap-1.5"
-	>
+	<div class="flex flex-wrap gap-1 mb-4 *:bg-surface0/50 *:shadow *:border *:border-surface1/50 *:rounded-md *:p-1.5 *:text-sm *:flex *:items-center *:gap-1.5">
 		<div>
 			<SvelteIcon class="size-5" />
 			<span>Svelte</span>
diff --git a/src/layouts/Layout.astro b/src/layouts/Layout.astro
index 759f688..0e6e524 100644
--- a/src/layouts/Layout.astro
+++ b/src/layouts/Layout.astro
@@ -6,6 +6,7 @@ import "../style.css";
 
 import { Image } from "astro:assets";
 
+import ThemeButton from "../components/ThemeButton.svelte";
 import Socials from "../components/Socials.astro";
 import Clock from "../components/Clock.svelte";
 import Online from "../components/Online.svelte";
@@ -15,11 +16,10 @@ import Footer from "../components/Footer.astro";
 
 import KawaiiLogo from "../assets/kawaii.svg";
 import TrafficConeAlt from "../assets/traffic-cone-alt.svg";
-import Lunar from "../assets/lunar.svg";
 import ProfilePicture from "../../public/pfp.webp";
 ---
 
-<html lang="en">
+<html lang="en" data-theme="dark">
 	<head>
 		<meta charset="utf-8" />
 		<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
@@ -71,10 +71,10 @@ import ProfilePicture from "../../public/pfp.webp";
 	</head>
 	<body class="bg-base text-text flex flex-col items-center px-8">
 		<a href="/" aria-label="trafficlunar logo" transition:persist>
-			<KawaiiLogo class="w-full h-48 mt-16 drop-shadow-md transition-transform duration-300 hover:rotate-2 hover:scale-105" />
+			<KawaiiLogo class="w-full h-50 mt-16 pb-1.5 drop-shadow-md transition-transform duration-300 hover:rotate-2 hover:scale-105" />
 		</a>
 
-		<Lunar aria-hidden class="absolute top-8 right-8 size-12 animate-avoid hover:animate-running not-hover:animate-pause" />
+		<ThemeButton client:only />
 
 		<div class="max-w-4xl w-full grid grid-cols-5 gap-4 py-8 max-[60rem]:grid-cols-1">
 			<div class="flex flex-col max-[32rem]:flex-row lg:flex-col items-center gap-6 sm:gap-8 lg:gap-8 justify-center md:justify-start" transition:persist>
@@ -86,7 +86,7 @@ import ProfilePicture from "../../public/pfp.webp";
 						height="160"
 						alt="profile picture"
 						decoding="async"
-						class="rounded-full animate-spin animate-duration-2s hover:animate-running not-hover:animate-pause max-h-40 max-w-40 min-h-40 min-w-40"
+						class="rounded-full drop-shadow-md animate-spin animate-duration-2s hover:animate-running not-hover:animate-pause max-h-40 max-w-40 min-h-40 min-w-40"
 					/>
 				</a>
 
diff --git a/src/pages/buttons.astro b/src/pages/buttons.astro
index df7320a..41a9b22 100644
--- a/src/pages/buttons.astro
+++ b/src/pages/buttons.astro
@@ -5,7 +5,9 @@ import EightyEightyThirtyOne from "../components/88x31.svelte";
 ---
 
 <Layout>
-	<section class="mb-0! transition-all duration-300 delay-100 starting:opacity-0 starting:translate-y-4 text-[0.938rem] [&_img]:w-[88px] [&_img]:h-[31px]">
+	<section
+		class="mb-0! transition-[translate,opacity] duration-300 delay-100 starting:opacity-0 starting:translate-y-4 text-[0.938rem] [&_img]:w-[88px] [&_img]:h-[31px]"
+	>
 		<legend>buttons</legend>
 
 		<p class="mb-1">
diff --git a/src/pages/index.astro b/src/pages/index.astro
index 178e17a..45a566c 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -10,7 +10,7 @@ import LocationIcon from "../assets/icons/location.svg";
 ---
 
 <Layout>
-	<section class="transition-all duration-300 delay-100 starting:opacity-0 starting:translate-y-4 text-[0.938rem]">
+	<section class="transition-[translate,opacity] duration-300 delay-100 starting:opacity-0 starting:translate-y-4 text-[0.938rem]">
 		<legend>about</legend>
 		<p>
 			Hey! I'm <strong class="text-peach">trafficlunar</strong>. I'm a <Age client:only /> year old self-proclaimed full-stack developer.
@@ -45,7 +45,9 @@ import LocationIcon from "../assets/icons/location.svg";
 
 	<Tools />
 
-	<div class="flex items-center gap-4 text-subtext0 text-sm font-medium my-4 transition-all duration-300 delay-250 starting:opacity-0 starting:translate-y-4">
+	<div
+		class="flex items-center gap-4 text-subtext0 text-sm font-medium my-4 transition-[translate,opacity] duration-300 delay-250 starting:opacity-0 starting:translate-y-4"
+	>
 		<hr class="grow border-surface1" />
 		<span>projects</span>
 		<hr class="grow border-surface1" />
diff --git a/src/style.css b/src/style.css
index eaeef3e..7c71b95 100644
--- a/src/style.css
+++ b/src/style.css
@@ -19,6 +19,39 @@
 		}
 	}
 
+	/* Catppuccin Latte */
+	--color-rosewater: #dc8a78;
+	--color-flamingo: #dd7878;
+	--color-pink: #ea76cb;
+	--color-mauve: #8839ef;
+	--color-red: #d20f39;
+	--color-maroon: #e64553;
+	--color-peach: #fe640b;
+	--color-yellow: #df8e1d;
+	--color-green: #40a02b;
+	--color-teal: #179287;
+	--color-sky: #04a5e5;
+	--color-sapphire: #209fb5;
+	--color-blue: #1e66f5;
+	--color-lavender: #7287fd;
+	--color-text: #4c4f69;
+	--color-subtext1: #5c5f77;
+	--color-subtext0: #6c6f85;
+	--color-overlay2: #7c7f93;
+	--color-overlay1: #8c8fa1;
+	--color-overlay0: #9ca0b0;
+	--color-surface2: #acb0be;
+	--color-surface1: #bcc0cc;
+	--color-surface0: #ccd0da;
+	--color-base: #eff1f5;
+	--color-mantle: #e6e9ef;
+	--color-crust: #dce0e8;
+
+	--color-base-darker: #eceef3;
+	--color-peach-darker: #ebcec1;
+}
+
+html[data-theme="dark"] {
 	/* Catppuccin Frappe */
 	--color-rosewater: #f2d5cf;
 	--color-flamingo: #eebebe;
@@ -121,3 +154,21 @@ section legend::after {
 [data-tooltip]:hover::after {
 	@apply opacity-100 scale-100;
 }
+
+/* Theme switching transition */
+::view-transition-new(root) {
+	mask: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 40 40"><circle cx="40" cy="0" r="20" fill="white"/></svg>') right top / 0
+		no-repeat;
+	animation: scale 1s;
+	animation-fill-mode: both;
+}
+
+::view-transition-old(root) {
+	animation: none;
+}
+
+@keyframes scale {
+	to {
+		mask-size: 250vmax;
+	}
+}