diff --git a/.vscode/settings.json b/.vscode/settings.json
index f813c91..b255cc8 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,7 +1,11 @@
 {
-	"[javascript][javascriptreact][typescript][typescriptreact][css][scss][html][json][jsonc][yaml]": {
+	"[javascript][javascriptreact][typescript][typescriptreact][css][scss][postcss][html][json][jsonc][yaml]": {
 		"editor.defaultFormatter": "biomejs.biome"
 	},
+	"editor.codeActionsOnSave": {
+		"quickFix.biome": "explicit",
+		"source.organizeImports.biome": "explicit"
+	},
 	"tailwindCSS.experimental.classRegex": [
 		["cva\\(([^)]*)\\)", "[\"'`]([^\"'`]*).*?[\"'`]"],
 		["cx\\(([^)]*)\\)", "(?:'|\"|`)([^']*)(?:'|\"|`)"]
diff --git a/app/components/Background.tsx b/app/components/Background.tsx
index ca03988..e840790 100644
--- a/app/components/Background.tsx
+++ b/app/components/Background.tsx
@@ -1,7 +1,8 @@
 import type { ReactNode } from "react";
-import { useId } from "react";
+import { useEffect, useId, useRef } from "react";
 
 import { cva } from "class-variance-authority";
+import { useReducedMotion } from "~/hooks/useMedia";
 import { cn } from "~/libs/utils";
 import { useTheme } from "./Theme";
 
@@ -35,12 +36,26 @@ export function Background({
 }: BackgroundProps): ReactNode {
 	const id = useId();
 	const theme = useTheme();
+	const isReducedMotion = useReducedMotion();
+
+	const svgRef = useRef<SVGSVGElement>(null);
+	useEffect(() => {
+		const $svg = svgRef.current;
+		if (!$svg) return;
+
+		if (isReducedMotion) {
+			$svg.pauseAnimations();
+		} else {
+			$svg.unpauseAnimations();
+		}
+	}, [isReducedMotion]);
 
 	return (
 		<svg
 			xmlns="http://www.w3.org/2000/svg"
 			role="presentation"
 			className={cn("-z-50 absolute inset-0 h-full w-full", className)}
+			ref={svgRef}
 			{...props}
 		>
 			<defs>
diff --git a/app/components/BottomNav.tsx b/app/components/BottomNav.tsx
index 36068ec..49cc8fd 100644
--- a/app/components/BottomNav.tsx
+++ b/app/components/BottomNav.tsx
@@ -50,7 +50,9 @@ export function BottomNav({ path, className }: BottomNavProps): ReactNode {
 									link.href === path && "-translate-y-1 -rotate-2",
 								)}
 							>
-								<Link to={link.href}>{link.label}</Link>
+								<Link to={link.href} viewTransition>
+									{link.label}
+								</Link>
 							</NavigationMenu.Link>
 						</NavigationMenu.Item>
 					))}
diff --git a/app/hooks/useMedia.ts b/app/hooks/useMedia.ts
new file mode 100644
index 0000000..a5a232d
--- /dev/null
+++ b/app/hooks/useMedia.ts
@@ -0,0 +1,22 @@
+import { useSyncExternalStore } from "react";
+
+export function useMedia(query: string, defaultState: boolean): boolean {
+	return useSyncExternalStore(
+		(callback) => {
+			const media = window.matchMedia(query);
+
+			media.addEventListener("change", callback);
+			return () => {
+				media.removeEventListener("change", callback);
+			};
+		},
+		() => {
+			return window.matchMedia(query).matches;
+		},
+		() => defaultState,
+	);
+}
+
+export function useReducedMotion(): boolean {
+	return useMedia("(prefers-reduced-motion: reduce)", false);
+}
diff --git a/app/routes/_auth.edit.tsx b/app/routes/_auth.edit.tsx
index 504e6b3..4c4b5ca 100644
--- a/app/routes/_auth.edit.tsx
+++ b/app/routes/_auth.edit.tsx
@@ -1,5 +1,9 @@
 import type { ReactNode } from "react";
 
 export default function Page(): ReactNode {
-	return <h1>キャラ編集</h1>;
+	return (
+		<main style={{ viewTransitionName: "main" }}>
+			<h1>キャラ編集</h1>
+		</main>
+	);
 }
diff --git a/app/routes/_auth.guide.tsx b/app/routes/_auth.guide.tsx
index ae04653..c41073f 100644
--- a/app/routes/_auth.guide.tsx
+++ b/app/routes/_auth.guide.tsx
@@ -1,5 +1,9 @@
 import type { ReactNode } from "react";
 
 export default function Page(): ReactNode {
-	return <h1>遊び方</h1>;
+	return (
+		<main style={{ viewTransitionName: "main" }}>
+			<h1>遊び方</h1>
+		</main>
+	);
 }
diff --git a/app/routes/_auth.play.tsx b/app/routes/_auth.play.tsx
index ba45c81..b9d4a1f 100644
--- a/app/routes/_auth.play.tsx
+++ b/app/routes/_auth.play.tsx
@@ -11,7 +11,7 @@ export default function Page() {
 
 	if (!session) return null;
 	return (
-		<div className="p-4 font-sans">
+		<div className="p-4 font-sans" style={{ viewTransitionName: "main" }}>
 			<h1 className="text-3xl">QR code</h1>
 			<ul className="mt-4 list-disc space-y-2 pl-6">
 				<QRCode url={session.user.id} size={512} />
diff --git a/app/routes/_index/route.tsx b/app/routes/_index/route.tsx
index 6b4ea25..33f7307 100644
--- a/app/routes/_index/route.tsx
+++ b/app/routes/_index/route.tsx
@@ -18,7 +18,10 @@ export default function Page() {
 	};
 
 	return (
-		<main className="grid h-dvh w-dvw grid-rows-2">
+		<main
+			className="grid h-dvh w-dvw grid-rows-2"
+			style={{ viewTransitionName: "main" }}
+		>
 			<h1 className="p-4 text-center text-4xl">Game</h1>
 			<div className="mx-auto flex max-w-96 flex-col gap-2 p-4">
 				{myProfile ? (
diff --git a/app/tailwind.css b/app/tailwind.css
index b5c61c9..dc4568c 100644
--- a/app/tailwind.css
+++ b/app/tailwind.css
@@ -1,3 +1,31 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
+
+/** 「視差効果を減らす」が有効な場合に、アニメーションやトランジションを無効化する */
+@media (prefers-reduced-motion: reduce) {
+	html:focus-within {
+		scroll-behavior: auto;
+	}
+	*,
+	*::before,
+	*::after {
+		animation-duration: 0.01ms !important;
+		animation-iteration-count: 1 !important;
+		transition-duration: 0.01ms !important;
+		scroll-behavior: auto !important;
+	}
+
+	::view-transition-group(*),
+	::view-transition-old(*),
+	::view-transition-new(*) {
+		animation: none !important;
+	}
+}
+
+::view-transition-old(root) {
+	animation: none;
+}
+::view-transition-new(root) {
+	animation: none;
+}