diff --git a/web/vite.config.ts b/web/vite.config.ts
index 647f1559..d1c5cddd 100644
--- a/web/vite.config.ts
+++ b/web/vite.config.ts
@@ -155,7 +155,10 @@ export default defineConfig({
                 }
             },
             injectManifest: {
-                globPatterns: ['**/*.{js,css,html,ico,png,svg,woff,woff2}']
+                globPatterns: ['**/*.{js,css,html,ico,png,svg,woff,woff2}'],
+                // The app's main chunk exceeds workbox's 2MiB default precache
+                // cap; raising the limit keeps the SPA fully precached offline.
+                maximumFileSizeToCacheInBytes: 4 * 1024 * 1024,
             },
             devOptions: {
                 enabled: true,