This is a template validation test item. Below are three H2 sections to test TOC auto-generation and IntersectionObserver scrollspy.
First section heading
This is the first H2 section. The TOC should auto-generate an entry for this heading. Scrolling should activate the corresponding TOC item via IntersectionObserver.
A second paragraph to add scroll height.
Second section heading
Second H2 section to verify TOC list builds with multiple items. Each H2 gets an auto-generated sec1, sec2, sec3 id for anchor links.
Sub-heading
An H3 to test typography hierarchy. H3s should NOT appear in the TOC.
Third and final section
Last H2 to confirm full TOC build. Conclusion + Sources sections below should render with sage gradient and cream backgrounds respectively.