diff --git a/tools/build_static.py b/tools/build_static.py
index 3888cdf..89cb1c6 100644
--- a/tools/build_static.py
+++ b/tools/build_static.py
@@ -70,18 +70,20 @@ def _write_redirects(out: Path, seg: str) -> None:
 
 def _write_headers(out: Path, seg: str) -> None:
     # The app shell must NOT be browser-cached — otherwise a deploy is invisible to
-    # returning visitors for hours (Pages' default is max-age=14400). The HTML entry
-    # points get `no-store` (never stored → a guaranteed-fresh index every visit):
-    # `no-cache` (revalidate) was not enough — Safari served a STALE index from its
-    # disk/bfcache, which then loaded the OLD versioned JS and broke the page. A fresh
-    # index is the linchpin: it carries the content-hashed asset URLs (see
-    # _version_assets), so once the HTML is fresh the JS/CSS are too. The rest of the
-    # app path stays `no-cache`. Media is on R2 (immutable + content-hash), unaffected.
-    # Cloudflare Pages `_headers` syntax; later rules win for the same header.
-    html_pages = ("", "index.html", "credits.html", "about.html")  # "" = the /seg/ root
-    blocks = [f"/{seg}/*\n  Cache-Control: no-cache\n"]
-    blocks += [f"/{seg}/{p}\n  Cache-Control: no-store\n" for p in html_pages]
-    (out / "_headers").write_text("".join(blocks))
+    # returning visitors for hours (Pages' default is max-age=14400). `no-store`
+    # (never stored → a guaranteed-fresh fetch every visit) for the whole app path:
+    # `no-cache` (revalidate) was NOT enough — Safari served a STALE index from its
+    # disk/bfcache, loaded the OLD versioned JS, and broke the page (black, silent).
+    # A per-HTML no-store override didn't stick (Pages let the `/seg/*` rule win), so
+    # we no-store the whole path. The app shell is tiny (~150 KB); the media is on R2
+    # (immutable + content-hash, a separate domain) and is unaffected. The content-
+    # hashed asset URLs (see _version_assets) remain as belt-and-suspenders for the
+    # case where Pages caches .js/.css at the edge by type and ignores _headers.
+    # Cloudflare Pages `_headers` syntax.
+    (out / "_headers").write_text(
+        f"/{seg}/*\n"
+        "  Cache-Control: no-store\n"
+    )
 
 
 def _version_assets(app_dir: Path) -> None: