Both used field-sizing:content with only max-w-full, which doesn't reliably clamp a long single-line value and could push the header row wider than its container. Add an explicit sm:max-w-xl ceiling on both. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WzyfRyA7h5rs5SCAahLAWd