diff --git a/frontend/.env.example b/frontend/.env.example
index c77a5dd..fc2ee33 100644
--- a/frontend/.env.example
+++ b/frontend/.env.example
@@ -7,8 +7,14 @@ ZITADEL_CLIENT_SECRET=your-web-app-client-secret
 AUTH_REDIRECT_URI=http://localhost:5173/auth/callback
 AUTH_POST_LOGOUT_URI=http://localhost:5173/
 
-# Secret used to sign the session cookie (any long random string)
+# Secret used to derive the session cookie encryption key (any long random string)
 SESSION_SECRET=change-me-to-a-long-random-string
 
+# Optional session tuning (defaults shown)
+# OIDC_SCOPE=openid profile email offline_access
+# SESSION_TTL_SECONDS=604800
+# SESSION_REFRESH_THRESHOLD_SECONDS=30
+# AUTH_FLOW_TTL_SECONDS=600
+
 # Backend API base URL (used from later parts)
 API_BASE_URL=http://localhost:5111
diff --git a/frontend/src/hooks.server.ts b/frontend/src/hooks.server.ts
index 27c25bf..ca76255 100644
--- a/frontend/src/hooks.server.ts
+++ b/frontend/src/hooks.server.ts
@@ -6,13 +6,12 @@ import {
 	sessionCookieOptions,
 	SESSION_COOKIE
 } from '$lib/server/auth';
-
-const REFRESH_THRESHOLD_SECONDS = 30;
+import { authConfig } from '$lib/server/config';
 
 export const handle: Handle = async ({ event, resolve }) => {
 	let session = await decodeSession(event.cookies.get(SESSION_COOKIE));
 
-	if (session && session.expiresAt - REFRESH_THRESHOLD_SECONDS <= Math.floor(Date.now() / 1000)) {
+	if (session && session.expiresAt - authConfig.refreshThresholdSeconds <= Math.floor(Date.now() / 1000)) {
 		session = await refreshSession(session);
 		if (session) {
 			event.cookies.set(SESSION_COOKIE, await encodeSession(session), sessionCookieOptions(event.url));
diff --git a/frontend/src/lib/server/auth.ts b/frontend/src/lib/server/auth.ts
index 594ba81..0dafe1a 100644
--- a/frontend/src/lib/server/auth.ts
+++ b/frontend/src/lib/server/auth.ts
@@ -1,6 +1,6 @@
 import * as client from 'openid-client';
 import { EncryptJWT, jwtDecrypt } from 'jose';
-import { env } from '$env/dynamic/private';
+import { authConfig } from '$lib/server/config';
 import type { SessionUser } from '$lib/types';
 
 export const SESSION_COOKIE = 'mf_session';
@@ -16,40 +16,27 @@ export interface Session extends SessionUser {
 	expiresAt: number;
 }
 
-export const OIDC_SCOPE = 'openid profile email offline_access';
-
 let configPromise: Promise<client.Configuration> | null = null;
 
 export function getOidcConfig(): Promise<client.Configuration> {
 	configPromise ??= (async () => {
-		const issuer = new URL(env.ZITADEL_ISSUER);
+		const issuer = new URL(authConfig.issuer);
 		const options =
 			issuer.protocol === 'http:' ? { execute: [client.allowInsecureRequests] } : undefined;
 
-		const secret = env.ZITADEL_CLIENT_SECRET;
-		const hasSecret = !!secret && !secret.startsWith('REPLACE_');
-
-		return hasSecret
-			? client.discovery(issuer, env.ZITADEL_CLIENT_ID, secret, undefined, options)
-			: client.discovery(issuer, env.ZITADEL_CLIENT_ID, undefined, client.None(), options);
+		const secret = authConfig.clientSecret;
+		return secret
+			? client.discovery(issuer, authConfig.clientId, secret, undefined, options)
+			: client.discovery(issuer, authConfig.clientId, undefined, client.None(), options);
 	})();
 	return configPromise;
 }
 
-export const authConfig = {
-	get redirectUri() {
-		return env.AUTH_REDIRECT_URI;
-	},
-	get postLogoutUri() {
-		return env.AUTH_POST_LOGOUT_URI;
-	}
-};
-
 let keyPromise: Promise<Uint8Array> | null = null;
 
 function sessionKey(): Promise<Uint8Array> {
 	keyPromise ??= crypto.subtle
-		.digest('SHA-256', new TextEncoder().encode(env.SESSION_SECRET))
+		.digest('SHA-256', new TextEncoder().encode(authConfig.sessionSecret))
 		.then((digest) => new Uint8Array(digest));
 	return keyPromise;
 }
@@ -60,15 +47,16 @@ export function sessionCookieOptions(url: URL) {
 		sameSite: 'lax' as const,
 		secure: url.protocol === 'https:',
 		path: '/',
-		maxAge: 60 * 60 * 24 * 7
+		maxAge: authConfig.sessionTtlSeconds
 	};
 }
 
 export async function encodeSession(session: Session): Promise<string> {
+	const now = Math.floor(Date.now() / 1000);
 	return new EncryptJWT({ ...session })
 		.setProtectedHeader({ alg: 'dir', enc: 'A256GCM' })
-		.setIssuedAt()
-		.setExpirationTime('7d')
+		.setIssuedAt(now)
+		.setExpirationTime(now + authConfig.sessionTtlSeconds)
 		.encrypt(await sessionKey());
 }
 
diff --git a/frontend/src/lib/server/config.ts b/frontend/src/lib/server/config.ts
new file mode 100644
index 0000000..3be521d
--- /dev/null
+++ b/frontend/src/lib/server/config.ts
@@ -0,0 +1,44 @@
+import { env } from '$env/dynamic/private';
+
+const DAY_SECONDS = 60 * 60 * 24;
+const DEFAULT_OIDC_SCOPE = 'openid profile email offline_access';
+
+function positiveInt(value: string | undefined, fallback: number): number {
+	if (value === undefined || value === '') return fallback;
+	const parsed = Number(value);
+	return Number.isInteger(parsed) && parsed > 0 ? parsed : fallback;
+}
+
+export const authConfig = {
+	get issuer() {
+		return env.ZITADEL_ISSUER;
+	},
+	get clientId() {
+		return env.ZITADEL_CLIENT_ID;
+	},
+	get clientSecret(): string | undefined {
+		const secret = env.ZITADEL_CLIENT_SECRET;
+		return secret && !secret.startsWith('REPLACE_') ? secret : undefined;
+	},
+	get scope() {
+		return env.OIDC_SCOPE || DEFAULT_OIDC_SCOPE;
+	},
+	get redirectUri() {
+		return env.AUTH_REDIRECT_URI;
+	},
+	get postLogoutUri() {
+		return env.AUTH_POST_LOGOUT_URI;
+	},
+	get sessionSecret() {
+		return env.SESSION_SECRET;
+	},
+	get sessionTtlSeconds() {
+		return positiveInt(env.SESSION_TTL_SECONDS, 7 * DAY_SECONDS);
+	},
+	get refreshThresholdSeconds() {
+		return positiveInt(env.SESSION_REFRESH_THRESHOLD_SECONDS, 30);
+	},
+	get flowTtlSeconds() {
+		return positiveInt(env.AUTH_FLOW_TTL_SECONDS, 600);
+	}
+};
diff --git a/frontend/src/routes/login/+server.ts b/frontend/src/routes/login/+server.ts
index 050f39f..45632f5 100644
--- a/frontend/src/routes/login/+server.ts
+++ b/frontend/src/routes/login/+server.ts
@@ -3,13 +3,12 @@ import * as client from 'openid-client';
 import type { RequestHandler } from './$types';
 import {
 	getOidcConfig,
-	authConfig,
-	OIDC_SCOPE,
 	STATE_COOKIE,
 	VERIFIER_COOKIE,
 	NONCE_COOKIE,
 	RETURN_COOKIE
 } from '$lib/server/auth';
+import { authConfig } from '$lib/server/config';
 
 export const GET: RequestHandler = async ({ url, cookies }) => {
 	const config = await getOidcConfig();
@@ -24,7 +23,7 @@ export const GET: RequestHandler = async ({ url, cookies }) => {
 
 	const parameters: Record<string, string> = {
 		redirect_uri: authConfig.redirectUri,
-		scope: OIDC_SCOPE,
+		scope: authConfig.scope,
 		code_challenge: codeChallenge,
 		code_challenge_method: 'S256',
 		state,
@@ -39,7 +38,7 @@ export const GET: RequestHandler = async ({ url, cookies }) => {
 		sameSite: 'lax' as const,
 		secure: url.protocol === 'https:',
 		path: '/',
-		maxAge: 600
+		maxAge: authConfig.flowTtlSeconds
 	};
 	cookies.set(VERIFIER_COOKIE, codeVerifier, cookieOptions);
 	cookies.set(STATE_COOKIE, state, cookieOptions);
diff --git a/frontend/src/routes/logout/+server.ts b/frontend/src/routes/logout/+server.ts
index 659863d..4ebf70c 100644
--- a/frontend/src/routes/logout/+server.ts
+++ b/frontend/src/routes/logout/+server.ts
@@ -1,7 +1,8 @@
 import { redirect } from '@sveltejs/kit';
 import * as client from 'openid-client';
 import type { RequestHandler } from './$types';
-import { getOidcConfig, authConfig, decodeSession, SESSION_COOKIE } from '$lib/server/auth';
+import { getOidcConfig, decodeSession, SESSION_COOKIE } from '$lib/server/auth';
+import { authConfig } from '$lib/server/config';
 
 const handleLogout: RequestHandler = async ({ cookies }) => {
 	const session = await decodeSession(cookies.get(SESSION_COOKIE));