diff --git a/.npmrc b/.npmrc
deleted file mode 100644
index cb15887..0000000
--- a/.npmrc
+++ /dev/null
@@ -1 +0,0 @@
-public-hoist-pattern[]=*@nextui-org/*
\ No newline at end of file
diff --git a/.prettierrc b/.prettierrc
deleted file mode 100644
index a3c4bea..0000000
--- a/.prettierrc
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "trailingComma": "es5",
-  "tabWidth": 2,
-  "semi": false,
-  "singleQuote": true,
-  "jsxSingleQuote": true
-}
diff --git a/biome.json b/biome.json
index c054f53..1e3c390 100644
--- a/biome.json
+++ b/biome.json
@@ -1,16 +1,17 @@
 {
 	"$schema": "https://biomejs.dev/schemas/2.0.0/schema.json",
 	"vcs": {
-		"enabled": false,
+		"enabled": true,
 		"clientKind": "git",
-		"useIgnoreFile": false
+		"useIgnoreFile": true
 	},
 	"files": {
 		"ignoreUnknown": false
 	},
 	"formatter": {
 		"enabled": true,
-		"indentStyle": "tab"
+		"indentStyle": "tab",
+		"lineWidth": 80
 	},
 	"linter": {
 		"enabled": true,
diff --git a/postcss.config.js b/postcss.config.mjs
similarity index 72%
rename from postcss.config.js
rename to postcss.config.mjs
index c148a5e..c42f31c 100644
--- a/postcss.config.js
+++ b/postcss.config.mjs
@@ -4,4 +4,4 @@ const config = {
 	},
 };
 
-module.exports = config;
+export default config;
diff --git a/src/app/api/erettsegi/route.ts b/src/app/api/erettsegi/route.ts
new file mode 100644
index 0000000..629da99
--- /dev/null
+++ b/src/app/api/erettsegi/route.ts
@@ -0,0 +1,120 @@
+import { type NextRequest, NextResponse } from "next/server";
+import { subjects } from "@/utils/subjects";
+
+export async function GET(req: NextRequest) {
+	try {
+		const { searchParams } = req.nextUrl;
+		const vizsgatargy = searchParams.get("vizsgatargy");
+		const ev = searchParams.get("ev");
+		const idoszak = searchParams.get("idoszak");
+		const szint = searchParams.get("szint");
+
+		if (!vizsgatargy || !ev || !idoszak || !szint) {
+			const missingParams = [];
+			if (!vizsgatargy) missingParams.push("vizsgatargy");
+			if (!ev) missingParams.push("ev");
+			if (!idoszak) missingParams.push("idoszak");
+			if (!szint) missingParams.push("szint");
+
+			return NextResponse.json(
+				{ error: `Hiányzó paraméterek: ${missingParams.join(", ")}` },
+				{ status: 400 },
+			);
+		}
+
+		if (parseInt(ev, 10) <= 2012) {
+			return NextResponse.json({ error: "Érvénytelen év" }, { status: 400 });
+		}
+
+		const validSubjects = subjects.map((subject) => subject.value);
+		if (!validSubjects.includes(vizsgatargy)) {
+			return NextResponse.json(
+				{ error: "Érvénytelen vizsgatárgy" },
+				{ status: 400 },
+			);
+		}
+
+		let honap: string;
+		switch (idoszak) {
+			case "osz":
+				honap = "okt";
+				break;
+			case "tavasz":
+				honap = "maj";
+				break;
+			default:
+				return NextResponse.json(
+					{ error: "Érvénytelen időszak" },
+					{ status: 400 },
+				);
+		}
+
+		let prefix: string;
+		switch (szint) {
+			case "emelt":
+				prefix = `e_${vizsgatargy}`;
+				break;
+			case "kozep":
+				prefix = `k_${vizsgatargy}`;
+				break;
+			default:
+				return NextResponse.json(
+					{ error: "Érvénytelen szint" },
+					{ status: 400 },
+				);
+		}
+
+		const protocol =
+			req.headers.get("x-forwarded-proto") === "https" ? "https" : "http";
+		const host = req.headers.get("host");
+		const baseUrl = `https://dload-oktatas.educatio.hu/erettsegi/feladatok_${ev}${idoszak}_${szint}/`;
+		const proxiedUrl = `${protocol}://${host}/api/proxy?link=${encodeURI(baseUrl)}`;
+
+		const shortev = ev.slice(-2);
+		const feladat = "fl";
+		const utmutato = "ut";
+		const forras = "for";
+		const megoldas = "meg";
+
+		let flPdfUrl: string | undefined,
+			utPdfUrl: string | undefined,
+			flZipUrl: string | undefined,
+			utZipUrl: string | undefined,
+			flMp3Url: string | undefined;
+
+		switch (vizsgatargy) {
+			case "inf":
+			case "infoism":
+			case "digkult":
+				flZipUrl = `${baseUrl}${prefix}${forras}_${shortev}${honap}_${feladat}.zip`;
+				flPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${feladat}.pdf`;
+				utZipUrl = `${baseUrl}${prefix}${megoldas}_${shortev}${honap}_${utmutato}.zip`;
+				utPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${utmutato}.pdf`;
+				break;
+			case "angol":
+			case "nemet":
+				flPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${feladat}.pdf`;
+				utPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${utmutato}.pdf`;
+				flMp3Url = `${baseUrl}${prefix}_${shortev}${honap}_${feladat}.mp3`;
+				break;
+			default:
+				flPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${feladat}.pdf`;
+				utPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${utmutato}.pdf`;
+				break;
+		}
+
+		return NextResponse.json(
+			{ flPdfUrl, utPdfUrl, flZipUrl, utZipUrl, flMp3Url },
+			{
+				status: 200,
+				headers: { "Cache-Control": "s-maxage=31536000" },
+			},
+		);
+	} catch (e: unknown) {
+		console.error("An unexpected error occurred in the API route:", e);
+		return NextResponse.json(
+			{ error: "Internal Server Error" },
+			{ status: 500 },
+		);
+	}
+}
diff --git a/src/app/api/proxy/route.ts b/src/app/api/proxy/route.ts
new file mode 100644
index 0000000..e73df09
--- /dev/null
+++ b/src/app/api/proxy/route.ts
@@ -0,0 +1,79 @@
+import { type NextRequest, NextResponse } from "next/server";
+import { Agent, fetch } from "undici";
+
+const insecureAgent = new Agent({
+	connect: {
+		rejectUnauthorized: false,
+	},
+});
+
+export async function GET(req: NextRequest) {
+	try {
+		const { searchParams } = req.nextUrl;
+		const link = searchParams.get("link");
+
+		if (!link) {
+			return NextResponse.json(
+				{ error: "Hiányzó paraméter: link" },
+				{ status: 400 },
+			);
+		}
+
+		let url: URL;
+		try {
+			url = new URL(link);
+		} catch (_error) {
+			return NextResponse.json(
+				{ error: "Érvénytelen link formátum" },
+				{ status: 400 },
+			);
+		}
+
+		if (url.hostname !== "dload-oktatas.educatio.hu") {
+			return NextResponse.json({ error: "Érvénytelen link" }, { status: 400 });
+		}
+
+		const externalResponse = await fetch(link, {
+			method: "GET",
+			dispatcher: insecureAgent,
+		});
+
+		if (!externalResponse.ok) {
+			return NextResponse.json(
+				{ error: "Hiba történt a külső forrás lekérése során." },
+				{ status: externalResponse.status },
+			);
+		}
+
+		const body = await externalResponse.arrayBuffer();
+
+		const contentType = externalResponse.headers.get("content-type");
+		const headers = new Headers();
+		headers.set("Cache-Control", "s-maxage=31536000, stale-while-revalidate");
+
+		if (contentType) {
+			headers.set("Content-Type", contentType);
+			if (contentType === "application/pdf") {
+				const filename = url.pathname.split("/").pop() ?? "document.pdf";
+				headers.set("Content-Disposition", `inline; filename="${filename}"`);
+			}
+		}
+
+		return new Response(body, {
+			status: 200,
+			headers: headers,
+		});
+	} catch (e: unknown) {
+		console.error("Proxy Error:", e);
+		if (e instanceof Error) {
+			return NextResponse.json(
+				{ error: "Internal Server Error", message: e.message },
+				{ status: 500 },
+			);
+		}
+		return NextResponse.json(
+			{ error: "An unexpected internal error occurred" },
+			{ status: 500 },
+		);
+	}
+}
diff --git a/src/app/api/validate/route.ts b/src/app/api/validate/route.ts
new file mode 100644
index 0000000..6dd450c
--- /dev/null
+++ b/src/app/api/validate/route.ts
@@ -0,0 +1,73 @@
+import { type NextRequest, NextResponse } from "next/server";
+import { Agent, fetch } from "undici";
+
+const insecureAgent = new Agent({
+	connect: {
+		rejectUnauthorized: false,
+	},
+});
+
+const ALLOWED_HOSTS = [
+	"localhost:3000",
+	"erettsegi.albert.lol",
+	"dload-oktatas.educatio.hu",
+];
+
+export async function GET(req: NextRequest) {
+	try {
+		const { searchParams } = req.nextUrl;
+		const link = searchParams.get("link");
+
+		if (!link) {
+			return NextResponse.json(
+				{ error: "Hiányzó paraméter: link" },
+				{ status: 400 },
+			);
+		}
+
+		let url: URL;
+		try {
+			url = new URL(link);
+		} catch (_error) {
+			return NextResponse.json(
+				{ error: "Érvénytelen link formátum" },
+				{ status: 400 },
+			);
+		}
+
+		if (!ALLOWED_HOSTS.includes(url.host)) {
+			return NextResponse.json({ error: "Érvénytelen link" }, { status: 400 });
+		}
+
+		const response = await fetch(link, {
+			method: "HEAD",
+			dispatcher: insecureAgent,
+		});
+
+		return NextResponse.json({ status: response.status }, { status: 200 });
+	} catch (e: unknown) {
+		console.error("Validation Error:", e);
+
+		if (e instanceof Error) {
+			const cause = e.cause as { code?: unknown } | undefined;
+			return NextResponse.json(
+				{
+					error: "Internal Server Error",
+					message: e.message,
+					cause: cause?.code ? String(cause.code) : undefined,
+					stack: process.env.NODE_ENV === "development" ? e.stack : undefined,
+				},
+				{ status: 500 },
+			);
+		}
+
+		return NextResponse.json(
+			{
+				error: "Internal Server Error",
+				message: "An unexpected error occurred",
+				details: String(e),
+			},
+			{ status: 500 },
+		);
+	}
+}
diff --git a/src/app/layout.tsx b/src/app/layout.tsx
new file mode 100644
index 0000000..658f29e
--- /dev/null
+++ b/src/app/layout.tsx
@@ -0,0 +1,52 @@
+import type { Metadata, Viewport } from "next";
+import Script from "next/script";
+import { Providers } from "@/app/providers";
+import { Inter } from "next/font/google";
+import "@/styles/globals.css";
+
+const inter = Inter({
+	subsets: ["latin"],
+	variable: "--font-inter",
+});
+
+export const metadata: Metadata = {
+	metadataBase: new URL("https://erettsegi.albert.lol"),
+	title: "Érettségi kereső",
+	description: "Egyszerű keresés és letöltés az érettségi feladatsorokhoz. 🏫",
+	icons: {
+		icon: "/favicon.ico",
+	},
+	openGraph: {
+		title: "Érettségi kereső",
+		description:
+			"Egyszerű keresés és letöltés az érettségi feladatsorokhoz. 🏫",
+		url: "https://erettsegi.albert.lol",
+		images: "/logo.png",
+	},
+};
+
+export const viewport: Viewport = {
+	themeColor: "#121212",
+	width: "device-width",
+	initialScale: 1,
+	maximumScale: 1,
+};
+
+export default function RootLayout({
+	children,
+}: Readonly<{
+	children: React.ReactNode;
+}>) {
+	return (
+		<html lang="hu" suppressHydrationWarning>
+			<Script
+				defer
+				src="https://analytics.albert.lol/script.js"
+				data-website-id="7b196f47-39c9-4b8e-8dfd-b6e707282eea"
+			/>
+			<body className={`${inter.variable} antialiased font-sans`}>
+				<Providers>{children}</Providers>
+			</body>
+		</html>
+	);
+}
diff --git a/src/pages/404.tsx b/src/app/not-found.tsx
similarity index 75%
rename from src/pages/404.tsx
rename to src/app/not-found.tsx
index 6736ed5..e58e4fa 100644
--- a/src/pages/404.tsx
+++ b/src/app/not-found.tsx
@@ -1,14 +1,10 @@
+"use client";
+
 import { Button } from "@heroui/button";
-import { useRouter } from "next/router";
 import { Footer } from "@/components/Footer";
+import Link from "next/link";
 
-export default function ErrorPage() {
-	const router = useRouter();
-
-	const handleBack = () => {
-		router.push("/");
-	};
-
+export default function NotFound() {
 	return (
 		<>
 			<main className="dark:bg-[#121212] text-foreground bg-background py-5">
@@ -22,9 +18,9 @@ export default function ErrorPage() {
 								<div className="text-2xl font-semibold text-gray-600">
 									<p className="mt-2">Az keresett oldal nem található.</p>
 									<p className="mt-8 text-center">
-										<Button color="primary" onPress={handleBack}>
-											Vissza
-										</Button>
+										<Link href="/">
+											<Button color="primary">Vissza</Button>
+										</Link>
 									</p>
 								</div>
 							</div>
diff --git a/src/pages/index.tsx b/src/app/page.tsx
similarity index 99%
rename from src/pages/index.tsx
rename to src/app/page.tsx
index f80b27d..a5bf412 100644
--- a/src/pages/index.tsx
+++ b/src/app/page.tsx
@@ -1,3 +1,5 @@
+"use client";
+
 import { ButtonGroup, Divider } from "@heroui/react";
 import { useEffect } from "react";
 import { Mp3Button, PdfButton, ZipButton } from "@/components/Buttons";
diff --git a/src/app/providers.tsx b/src/app/providers.tsx
new file mode 100644
index 0000000..0df5afd
--- /dev/null
+++ b/src/app/providers.tsx
@@ -0,0 +1,14 @@
+"use client";
+
+import { HeroUIProvider } from "@heroui/react";
+import { ThemeProvider } from "next-themes";
+
+export function Providers({ children }: { children: React.ReactNode }) {
+	return (
+		<HeroUIProvider>
+			<ThemeProvider attribute="class" defaultTheme="dark" enableSystem={true}>
+				{children}
+			</ThemeProvider>
+		</HeroUIProvider>
+	);
+}
diff --git a/src/components/Buttons.tsx b/src/components/Buttons.tsx
index 8390db7..79d1154 100644
--- a/src/components/Buttons.tsx
+++ b/src/components/Buttons.tsx
@@ -1,3 +1,5 @@
+"use client";
+
 import { Button } from "@heroui/react";
 import React, { useCallback, useEffect, useState } from "react";
 import type { ButtonProps } from "@/utils/props";
diff --git a/src/components/Footer.tsx b/src/components/Footer.tsx
index d94bdab..c931017 100644
--- a/src/components/Footer.tsx
+++ b/src/components/Footer.tsx
@@ -1,3 +1,5 @@
+"use client";
+
 import { Source } from "@/components/Source";
 import { ThemeSwitcher } from "@/components/ThemeSwitcher";
 
diff --git a/src/components/Selectors.tsx b/src/components/Selectors.tsx
index be9fed9..b1a2f77 100644
--- a/src/components/Selectors.tsx
+++ b/src/components/Selectors.tsx
@@ -1,3 +1,5 @@
+"use client";
+
 import { Select, SelectItem } from "@heroui/react";
 import type { SelectorProps } from "@/utils/props";
 import type { ChangeEvent } from "react";
diff --git a/src/components/Source.tsx b/src/components/Source.tsx
index 11fbe82..2e219a2 100644
--- a/src/components/Source.tsx
+++ b/src/components/Source.tsx
@@ -1,3 +1,5 @@
+"use client";
+
 import { Button } from "@heroui/button";
 import { VscGithubInverted } from "react-icons/vsc";
 
diff --git a/src/components/ThemeSwitcher.tsx b/src/components/ThemeSwitcher.tsx
index 9939646..6e25394 100644
--- a/src/components/ThemeSwitcher.tsx
+++ b/src/components/ThemeSwitcher.tsx
@@ -1,3 +1,5 @@
+"use client";
+
 import { Button } from "@heroui/button";
 import { useTheme } from "next-themes";
 import { VscColorMode } from "react-icons/vsc";
diff --git a/src/hooks/useState.ts b/src/hooks/useState.ts
index fcd417f..aacaff9 100644
--- a/src/hooks/useState.ts
+++ b/src/hooks/useState.ts
@@ -1,3 +1,5 @@
+"use client";
+
 import { useState } from "react";
 import useYears from "@/hooks/useYears";
 
diff --git a/src/hooks/useYears.tsx b/src/hooks/useYears.tsx
index ab3442f..5161ab7 100644
--- a/src/hooks/useYears.tsx
+++ b/src/hooks/useYears.tsx
@@ -1,3 +1,5 @@
+"use client";
+
 import { useEffect } from "react";
 
 export default function useYears(
diff --git a/src/pages/_app.tsx b/src/pages/_app.tsx
deleted file mode 100644
index a5bffda..0000000
--- a/src/pages/_app.tsx
+++ /dev/null
@@ -1,30 +0,0 @@
-import { HeroUIProvider } from "@heroui/react";
-import type { AppProps } from "next/app";
-import { Inter } from "next/font/google";
-import Head from "next/head";
-import { ThemeProvider as NextThemesProvider } from "next-themes";
-import "@/styles/globals.css";
-
-const inter = Inter({
-	subsets: ["latin"],
-	variable: "--font-inter",
-});
-
-export default function App({ Component, pageProps }: AppProps) {
-	return (
-		<>
-			<Head>
-				<title>Érettségi kereső</title>
-			</Head>
-			<HeroUIProvider className={`${inter.variable} font-sans`}>
-				<NextThemesProvider
-					attribute="class"
-					defaultTheme="dark"
-					enableSystem={true}
-				>
-					<Component {...pageProps} />
-				</NextThemesProvider>
-			</HeroUIProvider>
-		</>
-	);
-}
diff --git a/src/pages/_document.tsx b/src/pages/_document.tsx
deleted file mode 100644
index 99a6a23..0000000
--- a/src/pages/_document.tsx
+++ /dev/null
@@ -1,35 +0,0 @@
-import { Head, Html, Main, NextScript } from "next/document";
-
-export default function Document() {
-	return (
-		<Html lang="hu">
-			<Head>
-				<meta name="theme-color" content="#121212" />
-				<meta name="title" content="Érettségi kereső" />
-				<meta name="og:title" content="Érettségi kereső" />
-				<meta property="og:url" content="https://erettsegi.albert.lol" />
-				<meta
-					name="description"
-					content="Egyszerű keresés és letöltés az érettségi feladatsorokhoz. 🏫"
-				/>
-				<meta
-					name="og:description"
-					content="Egyszerű keresés és letöltés az érettségi feladatsorokhoz. 🏫"
-				/>
-				<script
-					defer
-					src="https://analytics.albert.lol/script.js"
-					data-website-id="7b196f47-39c9-4b8e-8dfd-b6e707282eea"
-				></script>
-				<link rel="icon" href="/favicon.ico" />
-				<meta property="image" content="/logo.png" />
-				<meta property="og:image" content="/logo.png" />
-				<meta name="author" content="albert" />
-			</Head>
-			<body>
-				<Main />
-				<NextScript />
-			</body>
-		</Html>
-	);
-}
diff --git a/src/pages/api/erettsegi.ts b/src/pages/api/erettsegi.ts
deleted file mode 100644
index 7dd35d8..0000000
--- a/src/pages/api/erettsegi.ts
+++ /dev/null
@@ -1,122 +0,0 @@
-import type { NextApiRequest, NextApiResponse } from "next";
-import { subjects } from "@/utils/subjects";
-
-export default function handler(req: NextApiRequest, res: NextApiResponse) {
-	try {
-		const { vizsgatargy, ev, idoszak, szint } = req.query as {
-			vizsgatargy: string;
-			ev: string;
-			idoszak: string;
-			szint: string;
-		};
-
-		const secure = req.headers["x-forwarded-proto"] === "https";
-		const protocol = secure ? "https" : "http";
-		const address = req.headers.host;
-
-		const baseUrl = `https://dload-oktatas.educatio.hu/erettsegi/feladatok_${ev}${idoszak}_${szint}/`;
-		const proxiedUrl = `${protocol}://${address}/api/proxy?link=${encodeURI(
-			baseUrl,
-		)}`;
-
-		const missingParams = [];
-		if (!ev) missingParams.push("ev");
-		if (!szint) missingParams.push("szint");
-		if (!idoszak) missingParams.push("idoszak");
-		if (!vizsgatargy) missingParams.push("vizsgatargy");
-
-		if (missingParams.length > 0) {
-			return res
-				.status(400)
-				.json({ error: `Hiányzó paraméterek: ${missingParams.join(", ")}` });
-		}
-
-		if (ev <= "2012") {
-			return res.status(400).json({ error: "Érvénytelen év" });
-		}
-
-		const validSubjects = subjects.map((subject) => subject.value);
-		if (!vizsgatargy || !validSubjects.includes(vizsgatargy)) {
-			return res.status(400).json({ error: "Érvénytelen vizsgatárgy" });
-		}
-
-		let honap: string;
-		switch (idoszak) {
-			case "osz":
-				honap = "okt";
-				break;
-			case "tavasz":
-				honap = "maj";
-				break;
-			default:
-				return res.status(400).json({ error: "Érvénytelen időszak" });
-		}
-
-		let prefix: string;
-		switch (szint) {
-			case "emelt":
-				prefix = `e_${vizsgatargy}`;
-				break;
-			case "kozep":
-				prefix = `k_${vizsgatargy}`;
-				break;
-			default:
-				return res.status(400).json({ error: "Érvénytelen szint" });
-		}
-
-		const feladat = "fl";
-		const utmutato = "ut";
-		const forras = "for";
-		const megoldas = "meg";
-		const shortev = ev.slice(-2);
-
-		let flPdfUrl: string | undefined,
-			utPdfUrl: string | undefined,
-			flZipUrl: string | undefined,
-			utZipUrl: string | undefined,
-			flMp3Url: string | undefined;
-		switch (vizsgatargy) {
-			case "inf":
-			case "infoism":
-			case "digkult":
-				flZipUrl = `${baseUrl}${prefix}${forras}_${shortev}${honap}_${feladat}.zip`;
-				flPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${feladat}.pdf`;
-				utZipUrl = `${baseUrl}${prefix}${megoldas}_${shortev}${honap}_${utmutato}.zip`;
-				utPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${utmutato}.pdf`;
-				break;
-			case "angol":
-			case "nemet":
-				flPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${feladat}.pdf`;
-				utPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${utmutato}.pdf`;
-				flMp3Url = `${baseUrl}${prefix}_${shortev}${honap}_${feladat}.mp3`;
-				break;
-			default:
-				flPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${feladat}.pdf`;
-				utPdfUrl = `${proxiedUrl}${prefix}_${shortev}${honap}_${utmutato}.pdf`;
-				break;
-		}
-
-		res.setHeader("Cache-Control", "s-maxage=31536000");
-		res.status(200).json({ flPdfUrl, utPdfUrl, flZipUrl, utZipUrl, flMp3Url });
-	} catch (e: unknown) {
-		if (e instanceof Error) {
-			let causeCode: string | undefined;
-			if (e.cause && typeof e.cause === "object" && "code" in e.cause) {
-				causeCode = String((e.cause as { code: unknown }).code);
-			}
-
-			res.status(500).json({
-				error: "Internal Server Error",
-				message: e.message,
-				cause: causeCode,
-				stack: process.env.NODE_ENV === "development" ? e.stack : undefined,
-			});
-		} else {
-			res.status(500).json({
-				error: "Internal Server Error",
-				message: "An unexpected error occurred",
-				details: String(e),
-			});
-		}
-	}
-}
diff --git a/src/pages/api/proxy.ts b/src/pages/api/proxy.ts
deleted file mode 100644
index f7c5bfe..0000000
--- a/src/pages/api/proxy.ts
+++ /dev/null
@@ -1,77 +0,0 @@
-import type { NextApiRequest, NextApiResponse } from "next";
-import { Agent, fetch } from "undici";
-
-const insecureAgent = new Agent({
-	connect: {
-		rejectUnauthorized: false,
-	},
-});
-
-export default async function handler(
-	req: NextApiRequest,
-	res: NextApiResponse,
-) {
-	const { link } = req.query as { link: string };
-	let missingParam: string | null = null;
-	if (!link) {
-		missingParam = "link";
-	}
-
-	if (missingParam) {
-		return res
-			.status(400)
-			.json({ error: `Hiányzó paraméter: ${missingParam}` });
-	}
-
-	const domain = link.split("/")[2];
-	if (domain !== "dload-oktatas.educatio.hu") {
-		return res.status(400).json({ error: "Érvénytelen link" });
-	}
-
-	try {
-		res.setHeader("Cache-Control", "s-maxage=31536000");
-
-		const response = await fetch(link, {
-			method: "GET",
-			dispatcher: insecureAgent,
-		});
-
-		const contentType = response.headers.get("content-type");
-
-		if (contentType === "application/pdf") {
-			const filename = link.split("/").pop() ?? "document.pdf";
-			res.setHeader("Content-Type", contentType);
-			res.setHeader("Content-Disposition", `inline; filename="${filename}"`);
-		}
-
-		if (response.ok) {
-			const arrayBuffer: ArrayBuffer = await response.arrayBuffer();
-			const buffer: Buffer = Buffer.from(arrayBuffer);
-			res.send(buffer);
-		} else {
-			res
-				.status(response.status)
-				.json({ error: "Hiba történt a lekérés során." });
-		}
-	} catch (e: unknown) {
-		if (e instanceof Error) {
-			let causeCode: string | undefined;
-			if (e.cause && typeof e.cause === "object" && "code" in e.cause) {
-				causeCode = String((e.cause as { code: unknown }).code);
-			}
-
-			res.status(500).json({
-				error: "Internal Server Error",
-				message: e.message,
-				cause: causeCode,
-				stack: process.env.NODE_ENV === "development" ? e.stack : undefined,
-			});
-		} else {
-			res.status(500).json({
-				error: "Internal Server Error",
-				message: "An unexpected error occurred",
-				details: String(e),
-			});
-		}
-	}
-}
diff --git a/src/pages/api/validate.ts b/src/pages/api/validate.ts
deleted file mode 100644
index 41b98bf..0000000
--- a/src/pages/api/validate.ts
+++ /dev/null
@@ -1,70 +0,0 @@
-import type { NextApiRequest, NextApiResponse } from "next";
-import { Agent, fetch } from "undici";
-
-const insecureAgent = new Agent({
-	connect: {
-		rejectUnauthorized: false,
-	},
-});
-
-export default async function handler(
-	req: NextApiRequest,
-	res: NextApiResponse,
-) {
-	const { link } = req.query as { link: string };
-	let missingParam: string | null = null;
-
-	if (!link) {
-		missingParam = "link";
-	}
-
-	if (missingParam) {
-		return res
-			.status(400)
-			.json({ error: `Hiányzó paraméter: ${missingParam}` });
-	}
-
-	const domain = link.split("/")[2];
-	if (
-		domain !== "localhost:3000" &&
-		domain !== "erettsegi.albert.lol" &&
-		domain !== "dload-oktatas.educatio.hu"
-	) {
-		return res.status(400).json({ error: "Érvénytelen link" });
-	}
-
-	try {
-		const { protocol, host } = new URL(link);
-		if (!protocol || !host) {
-			return res.status(400).json({ error: "Érvénytelen link" });
-		}
-
-		const response = await fetch(link, {
-			method: "HEAD",
-			dispatcher: insecureAgent,
-		});
-
-		const status = response.status;
-		res.status(200).json({ status });
-	} catch (e: unknown) {
-		if (e instanceof Error) {
-			let causeCode: string | undefined;
-			if (e.cause && typeof e.cause === "object" && "code" in e.cause) {
-				causeCode = String((e.cause as { code: unknown }).code);
-			}
-
-			res.status(500).json({
-				error: "Internal Server Error",
-				message: e.message,
-				cause: causeCode,
-				stack: process.env.NODE_ENV === "development" ? e.stack : undefined,
-			});
-		} else {
-			res.status(500).json({
-				error: "Internal Server Error",
-				message: "An unexpected error occurred",
-				details: String(e),
-			});
-		}
-	}
-}
diff --git a/tsconfig.json b/tsconfig.json
index 4c01a40..c284e92 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,27 +1,36 @@
 {
 	"compilerOptions": {
-		/* Base Options: */
-		"esModuleInterop": true,
-		"skipLibCheck": true,
-		"target": "es2022",
+		/* Basic Options */
+		"target": "esnext",
+		"lib": ["dom", "dom.iterable", "esnext"],
 		"allowJs": true,
-		"resolveJsonModule": true,
-		"moduleDetection": "force",
-		"isolatedModules": true,
+		"skipLibCheck": true,
+		"jsx": "preserve",
+		"incremental": true,
+		"plugins": [
+			{
+				"name": "next"
+			}
+		],
 
 		/* Strictness */
 		"strict": true,
+		"noUnusedLocals": true,
+		"noUnusedParameters": true,
+		"noFallthroughCasesInSwitch": true,
 		"noUncheckedIndexedAccess": true,
-		"checkJs": true,
 
-		/* Bundled projects */
-		"lib": ["dom", "dom.iterable", "ES2022"],
+		/* Module Resolution */
+		"module": "esnext",
+		"moduleResolution": "bundler",
+		"resolveJsonModule": true,
+		"isolatedModules": true,
+		"verbatimModuleSyntax": true,
+
+		/* Code Style */
+		"forceConsistentCasingInFileNames": true,
 		"noEmit": true,
-		"module": "ESNext",
-		"moduleResolution": "Bundler",
-		"jsx": "preserve",
-		"plugins": [{ "name": "next" }],
-		"incremental": true,
+		"esModuleInterop": true,
 
 		/* Path Aliases */
 		"baseUrl": ".",
@@ -29,16 +38,6 @@
 			"@/*": ["./src/*"]
 		}
 	},
-	"include": [
-		".eslintrc.cjs",
-		"next-env.d.ts",
-		"**/*.ts",
-		"**/*.tsx",
-		"**/*.cjs",
-		"**/*.js",
-		".next/types/**/*.ts",
-		"next.config.mjs",
-		"postcss.config.mjs"
-	],
+	"include": ["next-env.d.ts", "**/*.ts", "**/*.tsx", ".next/types/**/*.ts"],
 	"exclude": ["node_modules"]
 }