feed: render poem fenced blocks as verse, not code

src/templates/post/index.tsx

@@ -118,6 +118,22 @@ const StyledContent = styled.div`
     line-height: 2em;
     font-family: Monaco, 'Andale Mono', 'Courier New', Courier, monospace;
   }
+  /* A fenced block tagged with the 'poem' language is verse, not code: drop
+     the code chrome and set it in the serif face, keeping the author's line
+     breaks and blank lines (which read as stanza breaks). */
+  pre:has(> code.language-poem) {
+    background-image: none;
+    border: none;
+    padding: 0;
+    margin: 1.8rem 0;
+    line-height: 1.75;
+  }
+  pre > code.language-poem {
+    font-family: Georgia, 'Times New Roman', serif;
+    font-size: 1.05rem;
+    color: #222222;
+    white-space: pre-wrap;
+  }
 `
 
 interface PostProps {