diff --git a/.github/workflows/fix-index-html-once.yml b/.github/workflows/fix-index-html-once.yml
new file mode 100644
index 0000000..f672818
--- /dev/null
+++ b/.github/workflows/fix-index-html-once.yml
@@ -0,0 +1,35 @@
+name: Caterium One-Time HTML Repair
+on:
+  push:
+    branches: ["fix/html-integrity-v1774"]
+permissions:
+  contents: write
+concurrency:
+  group: caterium-html-repair-v1774
+  cancel-in-progress: false
+jobs:
+  repair:
+    if: ${{ !contains(github.event.head_commit.message, '[html-repair]') }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: fix/html-integrity-v1774
+          fetch-depth: 0
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+      - run: node scripts/fix-index-html-once.mjs
+      - name: Commit repaired index
+        shell: bash
+        run: |
+          set -euo pipefail
+          if git diff --quiet -- public/index.html; then
+            echo "No index change required"
+            exit 0
+          fi
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git add public/index.html
+          git commit -m "fix: close mobile style block [html-repair]"
+          git push origin HEAD:fix/html-integrity-v1774