for f in *.html; do
  # Only process files that contain the related-box div
  if grep -q '<div class="related-box">' "$f"; then

    # If the Player Guides link is missing, insert it before </div>
    if ! grep -q '<a href="/player-guides/">📖 Player Guides</a>' "$f"; then
      sed -i '/<div class="related-box">/,/<\/div>/ {
        /<\/div>/ i\        <a href="/player-guides/">📖 Player Guides</a>
      }' "$f"
      echo "Updated: $f"
    else
      echo "Already present: $f"
    fi

  fi
done