diff --git a/CHANGELOG.md b/CHANGELOG.md
index d503ee4988..4a7b117be3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,7 @@ All notable changes to this project will be documented in this file. Take a look
 #### Navigator
 
 * [#121](https://github.com/readium/swift-toolkit/issues/121) HTML `<audio>` and `<video>` elements are now paused when the resource moves off-screen in the EPUB navigator, rather than continuing to play in the background.
+* Fixed the PDF navigator's content being inset by the surrounding safe area (e.g. the navigation bar) on iOS 27.
 
 #### LCP
 
diff --git a/Sources/Navigator/PDF/PDFDocumentView.swift b/Sources/Navigator/PDF/PDFDocumentView.swift
index 1661184e6c..e02a9507ea 100644
--- a/Sources/Navigator/PDF/PDFDocumentView.swift
+++ b/Sources/Navigator/PDF/PDFDocumentView.swift
@@ -57,6 +57,18 @@ public final class PDFDocumentView: PDFView {
         documentViewDelegate?.pdfDocumentView(self, didGoTo: destination)
     }
 
+    /// Since iOS 27, PDFKit lays out the pages inside the view's bounds inset
+    /// by its `safeAreaInsets`, instead of the full bounds. In paginated mode
+    /// this is not routed through the scroll view's `contentInset` at all, so
+    /// neither `contentInsetAdjustmentBehavior` nor zeroing `contentInset` has
+    /// any effect on it.
+    ///
+    /// We report our own insets instead, so that PDFKit lays out the content
+    /// exactly where we want it.
+    override public var safeAreaInsets: UIEdgeInsets {
+        contentInset
+    }
+
     override public func safeAreaInsetsDidChange() {
         super.safeAreaInsetsDidChange()
         updateContentInset()
diff --git a/TestApp/Sources/AppDelegate.swift b/TestApp/Sources/AppDelegate.swift
index 03ac3459d2..93166a9da1 100644
--- a/TestApp/Sources/AppDelegate.swift
+++ b/TestApp/Sources/AppDelegate.swift
@@ -4,71 +4,25 @@
 //  available in the top-level LICENSE file of the project.
 //
 
-import Combine
-import ReadiumShared
 import UIKit
 
 @main
 class AppDelegate: UIResponder, UIApplicationDelegate {
-    var window: UIWindow?
-
-    private var app: AppModule!
-    private var subscriptions = Set<AnyCancellable>()
+    private(set) static var app: AppModule!
 
     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
-        app = try! AppModule()
-
-        func makeItem(title: String, image: String) -> UITabBarItem {
-            UITabBarItem(
-                title: NSLocalizedString(title, comment: "Library tab title"),
-                image: UIImage(named: image),
-                tag: 0
-            )
-        }
-
-        // Library
-        let libraryViewController = app.library.rootViewController
-        libraryViewController.tabBarItem = makeItem(title: "bookshelf_tab", image: "bookshelf")
-
-        // OPDS Feeds
-        let opdsViewController = app.opds.rootViewController
-        opdsViewController.tabBarItem = makeItem(title: "catalogs_tab", image: "catalogs")
-
-        // About
-        let aboutViewController = app.aboutViewController
-        aboutViewController.tabBarItem = makeItem(title: "about_tab", image: "about")
-
-        let tabBarController = UITabBarController()
-        tabBarController.viewControllers = [
-            libraryViewController,
-            opdsViewController,
-            aboutViewController,
-        ]
-
-        window = UIWindow(frame: UIScreen.main.bounds)
-        window?.rootViewController = tabBarController
-        window?.makeKeyAndVisible()
-
+        Self.app = try! AppModule()
         return true
     }
 
-    func application(_ application: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
-        guard let url = url.anyURL.absoluteURL, let vc = window?.rootViewController else {
-            return false
-        }
-
-        Task {
-            do {
-                try await app.library.importPublication(from: url, progress: { _ in })
-            } catch {
-                guard let error = error as? UserErrorConvertible else {
-                    print(error)
-                    return
-                }
-                vc.alert(error)
-            }
-        }
-
-        return true
+    func application(
+        _ application: UIApplication,
+        configurationForConnecting connectingSceneSession: UISceneSession,
+        options: UIScene.ConnectionOptions
+    ) -> UISceneConfiguration {
+        UISceneConfiguration(
+            name: "Default Configuration",
+            sessionRole: connectingSceneSession.role
+        )
     }
 }
diff --git a/TestApp/Sources/Info.plist b/TestApp/Sources/Info.plist
index 1f0835111d..66b0535729 100644
--- a/TestApp/Sources/Info.plist
+++ b/TestApp/Sources/Info.plist
@@ -216,30 +216,30 @@
 				<string>org.readium.lcpa</string>
 			</array>
 		</dict>
-        <dict>
-            <key>CFBundleTypeName</key>
-            <string>Zipped Audiobook</string>
-            <key>CFBundleTypeRole</key>
-            <string>Viewer</string>
-            <key>LSHandlerRank</key>
-            <string>Alternate</string>
-            <key>LSItemContentTypes</key>
-            <array>
-                <string>org.readium.zab</string>
-            </array>
-        </dict>
-        <dict>
-            <key>CFBundleTypeName</key>
-            <string>Audiobook</string>
-            <key>CFBundleTypeRole</key>
-            <string>Viewer</string>
-            <key>LSHandlerRank</key>
-            <string>Alternate</string>
-            <key>LSItemContentTypes</key>
-            <array>
-                <string>public.audio</string>
-            </array>
-        </dict>
+		<dict>
+			<key>CFBundleTypeName</key>
+			<string>Zipped Audiobook</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>LSHandlerRank</key>
+			<string>Alternate</string>
+			<key>LSItemContentTypes</key>
+			<array>
+				<string>org.readium.zab</string>
+			</array>
+		</dict>
+		<dict>
+			<key>CFBundleTypeName</key>
+			<string>Audiobook</string>
+			<key>CFBundleTypeRole</key>
+			<string>Viewer</string>
+			<key>LSHandlerRank</key>
+			<string>Alternate</string>
+			<key>LSItemContentTypes</key>
+			<array>
+				<string>public.audio</string>
+			</array>
+		</dict>
 	</array>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
@@ -264,6 +264,23 @@
 		<key>NSAllowsArbitraryLoads</key>
 		<true/>
 	</dict>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>audio</string>
diff --git a/TestApp/Sources/Reader/Common/Preferences/UserPreferences.swift b/TestApp/Sources/Reader/Common/Preferences/UserPreferences.swift
index 2d78d080b2..4af7ec6f1b 100644
--- a/TestApp/Sources/Reader/Common/Preferences/UserPreferences.swift
+++ b/TestApp/Sources/Reader/Common/Preferences/UserPreferences.swift
@@ -760,7 +760,7 @@ struct UserPreferences<
             isActive: isActive,
             onClear: onClear
         ) {
-            HStack {
+            HStack(spacing: 4) {
                 Stepper(title,
                         onIncrement: onIncrement,
                         onDecrement: onDecrement)
@@ -835,7 +835,7 @@ struct UserPreferences<
         onClear: @escaping () -> Void,
         content: @escaping () -> V
     ) -> some View {
-        HStack {
+        HStack(spacing: 8) {
             content()
                 .foregroundColor(isActive ? nil : .gray)
 
diff --git a/TestApp/Sources/Reader/Common/ReaderViewController.swift b/TestApp/Sources/Reader/Common/ReaderViewController.swift
index e6213af835..7d5f322f80 100644
--- a/TestApp/Sources/Reader/Common/ReaderViewController.swift
+++ b/TestApp/Sources/Reader/Common/ReaderViewController.swift
@@ -56,9 +56,14 @@ class ReaderViewController<N: Navigator>: UIViewController,
     override func viewDidLoad() {
         super.viewDidLoad()
 
+        navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(systemName: "xmark"), style: .plain, target: self, action: #selector(close))
         navigationItem.rightBarButtonItems = makeNavigationBarButtons()
     }
 
+    @objc private func close() {
+        dismiss(animated: true)
+    }
+
     override func viewWillAppear(_ animated: Bool) {
         super.viewWillAppear(animated)
 
diff --git a/TestApp/Sources/Reader/ReaderModule.swift b/TestApp/Sources/Reader/ReaderModule.swift
index 078cf44801..9b5460260f 100644
--- a/TestApp/Sources/Reader/ReaderModule.swift
+++ b/TestApp/Sources/Reader/ReaderModule.swift
@@ -60,11 +60,9 @@ final class ReaderModule: ReaderModuleAPI {
             }
 
             @MainActor func present(_ viewController: UIViewController) {
-                let backItem = UIBarButtonItem()
-                backItem.title = ""
-                viewController.navigationItem.backBarButtonItem = backItem
-                viewController.hidesBottomBarWhenPushed = true
-                navigationController.pushViewController(viewController, animated: true)
+                let host = UINavigationController(rootViewController: viewController)
+                host.modalPresentationStyle = .fullScreen
+                navigationController.present(host, animated: true)
             }
 
             guard let module = self.formatModules.first(where: { $0.supports(publication) }) else {
diff --git a/TestApp/Sources/SceneDelegate.swift b/TestApp/Sources/SceneDelegate.swift
new file mode 100644
index 0000000000..aa5db30f83
--- /dev/null
+++ b/TestApp/Sources/SceneDelegate.swift
@@ -0,0 +1,89 @@
+//
+//  Copyright 2026 Readium Foundation. All rights reserved.
+//  Use of this source code is governed by the BSD-style license
+//  available in the top-level LICENSE file of the project.
+//
+
+import ReadiumShared
+import UIKit
+
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+    var window: UIWindow?
+
+    private var app: AppModule {
+        AppDelegate.app
+    }
+
+    func scene(
+        _ scene: UIScene,
+        willConnectTo session: UISceneSession,
+        options connectionOptions: UIScene.ConnectionOptions
+    ) {
+        guard let windowScene = scene as? UIWindowScene else {
+            return
+        }
+
+        func makeItem(title: String, image: String) -> UITabBarItem {
+            UITabBarItem(
+                title: NSLocalizedString(title, comment: "Library tab title"),
+                image: UIImage(named: image),
+                tag: 0
+            )
+        }
+
+        // Library
+        let libraryViewController = app.library.rootViewController
+        libraryViewController.tabBarItem = makeItem(title: "bookshelf_tab", image: "bookshelf")
+
+        // OPDS Feeds
+        let opdsViewController = app.opds.rootViewController
+        opdsViewController.tabBarItem = makeItem(title: "catalogs_tab", image: "catalogs")
+
+        // About
+        let aboutViewController = app.aboutViewController
+        aboutViewController.tabBarItem = makeItem(title: "about_tab", image: "about")
+
+        let tabBarController = UITabBarController()
+        tabBarController.viewControllers = [
+            libraryViewController,
+            opdsViewController,
+            aboutViewController,
+        ]
+
+        let window = UIWindow(windowScene: windowScene)
+        window.rootViewController = tabBarController
+        window.makeKeyAndVisible()
+        self.window = window
+
+        // The scene can be launched by opening a publication, in which case
+        // the URLs are delivered here instead of `scene(_:openURLContexts:)`.
+        importPublications(from: connectionOptions.urlContexts)
+    }
+
+    func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
+        importPublications(from: URLContexts)
+    }
+
+    private func importPublications(from contexts: Set<UIOpenURLContext>) {
+        for context in contexts {
+            guard let url = context.url.anyURL.absoluteURL else {
+                continue
+            }
+
+            Task {
+                do {
+                    try await app.library.importPublication(from: url, progress: { _ in })
+                } catch {
+                    guard
+                        let error = error as? UserErrorConvertible,
+                        let vc = window?.rootViewController
+                    else {
+                        print(error)
+                        return
+                    }
+                    vc.alert(error)
+                }
+            }
+        }
+    }
+}