diff --git a/sites/mainweb/app/(portal)/providers.tsx b/sites/mainweb/app/(portal)/providers.tsx
index b3557549..89a60197 100644
--- a/sites/mainweb/app/(portal)/providers.tsx
+++ b/sites/mainweb/app/(portal)/providers.tsx
@@ -4,17 +4,39 @@ import type { ReactNode } from "react";
 import { SessionProvider } from "next-auth/react";
 import { QueryClientProvider } from "@tanstack/react-query";
 import { httpBatchLink } from "@trpc/client";
-import { useState } from "react";
+import { useEffect, useState } from "react";
 import superjson from "superjson";
 import { trpc } from "@/lib/trpc";
 import { createAppQueryClient } from "@/lib/query-client";
 import { ThemeProvider as NextThemesProvider } from "next-themes";
 
+// next-themes writes the portal theme onto <html> (a `light` or `dark` class
+// and an inline color-scheme) and leaves it there when the portal unmounts. A
+// client-side move back to a marketing page, such as the browser's back button,
+// then kept the portal's light ramp on the dark site until a reload. Clearing
+// it on unmount hands those pages back their own dark default.
+function ClearThemeOnLeave() {
+  useEffect(
+    () => () => {
+      const root = document.documentElement;
+      root.classList.remove("light", "dark");
+      root.style.removeProperty("color-scheme");
+    },
+    [],
+  );
+  return null;
+}
+
 function AppThemeProvider({
   children,
   ...props
 }: React.ComponentProps<typeof NextThemesProvider> & { children: ReactNode }) {
-  return <NextThemesProvider {...props}>{children}</NextThemesProvider>;
+  return (
+    <NextThemesProvider {...props}>
+      <ClearThemeOnLeave />
+      {children}
+    </NextThemesProvider>
+  );
 }
 
 export function Providers({ children }: { children: React.ReactNode }) {
diff --git a/sites/mainweb/proxy.ts b/sites/mainweb/proxy.ts
index e2a954ab..dc261890 100644
--- a/sites/mainweb/proxy.ts
+++ b/sites/mainweb/proxy.ts
@@ -42,11 +42,17 @@ const PRIVATE_PREFIXES = [
   "/scan",
 ];
 
+/** Exact paths only: a prefix would catch a dynamic page added under one. */
+const STATIC_PAGES = new Set(["/", "/bootcamp", "/status", "/team"]);
+
 function getCacheControl(pathname: string): string {
   if (PRIVATE_PREFIXES.some((prefix) => pathname.startsWith(prefix))) {
     return "private, no-store, must-revalidate";
   }
-  if (pathname === "/") {
+  // Prerendered pages that read no cookie and revalidate every five minutes.
+  // `public` lets App Hosting's CDN serve them from an edge near the visitor;
+  // they fell through to no-store below, so every visit went to Cloud Run.
+  if (STATIC_PAGES.has(pathname)) {
     return "public, max-age=300, must-revalidate";
   }
   // Must match next.config.mjs: this runs after it and would overwrite its day