fix(styles): remove stray top margin on Callout leading headings

[ted-palmer]

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Claude finished @ted-palmer's task in 1m 33s —— View job

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Code Review — PR #370

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Reviewed the single change to style.css (+7/-0). This is a clean, low-risk styling fix. ✅

Summary

Adds a scoped rule so a heading placed as the first child inside a Callout no longer keeps a stray top margin on the deployed build:

.callout .prose > :first-child {
  margin-top: 0;
}

What's good

• Scoped and specific. Adding .callout bumps specificity above the generic .prose > :first-child reset the comment mentions, so margin-top: 0 should reliably win inside callouts without affecting prose elsewhere.
• Well-commented. The comment explains why the rule exists (the prose first-child reset losing inside the callout on the deployed build), which is exactly the kind of context that prevents a future "is this still needed?" deletion.
• Applies uniformly to all callout variants (<Tip>, <Warning>, <Info>, <Note>), which is consistent behavior.

Minor observations (non-blocking)

• No trailing newline at end of style.css (\ No newline at end of file). This is pre-existing — not introduced by this PR — so nothing to fix here, but worth cleaning up whenever the file is next touched.
• Indentation. The new block is indented 2 spaces like its neighbors, but this file mixes column-0 and 2-space top-level rules throughout, so it matches the surrounding (inconsistent) style. No change needed.

No correctness or specificity issues found. Change looks good to merge — and it's already been approved.