Refine blog post single view and author styling

website/src/css/customTheme.scss

@@ -754,6 +754,43 @@ html[data-theme="dark"] .homepage {
 
 /* Blog */
 
+// Compact multi-author blog grid: two columns (one on the smallest screens),
+// capped to a narrow width on desktop rather than spanning the content.
+.col--6[class*="authorCol"] {
+  --ifm-avatar-intro-margin: 0.7rem;
+
+  flex: 0 0 50%;
+
+  @media (max-width: 768px) {
+    flex: 0 0 100%;
+  }
+
+  [class*="authorImage"] {
+    --ifm-avatar-photo-size: 1.75rem;
+  }
+
+  [class*="authorName"] {
+    font-size: 0.9rem;
+  }
+
+  [class*="authorTitle"] {
+    font-size: 0.75rem;
+
+    // Don't truncate long titles.
+    display: block;
+    overflow: visible;
+    line-clamp: none;
+    -webkit-line-clamp: none;
+  }
+}
+
+// Cap the grid on desktop only; tablet keeps the full-width two columns.
+@media (min-width: 997px) {
+  .row:has(> [class*="authorCol"]) {
+    max-width: 560px;
+  }
+}
+
 .avatar__name {
   font-weight: 600;
   display: inline-flex;

website/src/theme/BlogLayout/index.tsx

@@ -9,30 +9,52 @@ import type {Props} from '@theme/BlogLayout';
 
 import React from 'react';
 import clsx from 'clsx';
+import {useLocation} from '@docusaurus/router';
 import Layout from '@theme/Layout';
 import BlogSidebar from '@theme/BlogSidebar';
 import DocsSecondaryNav from '@site/src/components/DocsSecondaryNav';
 
+import styles from './styles.module.css';
+
+// Individual posts live under a dated path; the index, pagination, tags,
+// archive and authors routes are the list-style pages that keep the sidebar.
+function useIsBlogPost() {
+  const {pathname} = useLocation();
+  return (
+    pathname !== '/blog' &&
+    pathname !== '/blog/' &&
+    !pathname.startsWith('/blog/page/') &&
+    !pathname.startsWith('/blog/tags') &&
+    !pathname.startsWith('/blog/archive') &&
+    !pathname.startsWith('/blog/authors')
+  );
+}
+
 // Ejected from @docusaurus/theme-classic to render the shared secondary nav
 // full-width below the main navbar, above the blog content.
 export default function BlogLayout(props: Props) {
   const {sidebar, toc, children, ...layoutProps} = props;
-  const hasSidebar = sidebar && sidebar.items.length > 0;
+  const isBlogPost = useIsBlogPost();
+  // Individual posts drop the recent-posts sidebar and center their content.
+  const showSidebar = !isBlogPost && sidebar && sidebar.items.length > 0;
+
+  let mainClassName;
+  if (isBlogPost) {
+    mainClassName = clsx('col', styles.blogPostMain);
+  } else if (showSidebar) {
+    mainClassName = clsx('col', 'col--7');
+  } else {
+    mainClassName = clsx('col', 'col--9', 'col--offset-1');
+  }
 
   return (
     <Layout {...layoutProps}>
       <DocsSecondaryNav />
       <div className="container margin-vert--lg">
         <div className="row">
-          <BlogSidebar sidebar={sidebar} />
-          <main
-            className={clsx('col', {
-              'col--7': hasSidebar,
-              'col--9 col--offset-1': !hasSidebar,
-            })}>
-            {children}
-          </main>
-          {toc && <div className="col col--2">{toc}</div>}
+          {showSidebar && <BlogSidebar sidebar={sidebar} />}
+          <main className={mainClassName}>{children}</main>
+          {toc && <div className={clsx('col', styles.tocColumn)}>{toc}</div>}
         </div>
       </div>
     </Layout>

website/src/theme/BlogLayout/styles.module.css

@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+.blogPostMain {
+  max-width: 800px;
+  padding-block: 24px;
+  margin-inline: auto;
+}
+
+@media (min-width: 997px) {
+  .tocColumn {
+    flex: 0 0 200px;
+    max-width: 200px;
+  }
+}