Floating Share Rail

<!--
  A vertical share rail that sticks beside the article as it scrolls. It is
  position: sticky, scoped to the flex row - NOT fixed to the window - so it
  never floats over other page sections and never overlaps content at 320px,
  where it sits as a compact 40px column beside the flowing text.
-->
<div class="mx-auto flex w-full max-w-3xl gap-3 sm:gap-5">
  <aside class="sticky top-4 flex h-fit shrink-0 flex-col gap-2" aria-label="Share this article">
    <a href="#" aria-label="Share on X" class="inline-flex h-10 w-10 items-center justify-center rounded-full border border-gray-200 text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 focus-visible:ring-offset-2 focus-visible:ring-offset-white dark:border-gray-800 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-gray-100 dark:focus-visible:ring-blue-400 dark:focus-visible:ring-offset-gray-950">
      <svg viewBox="0 0 24 24" class="h-4 w-4" fill="currentColor" aria-hidden="true"><path d="M18.244 2.25h3.308l-7.227 8.26 8.502 11.24H16.17l-5.214-6.817L4.99 21.75H1.68l7.73-8.835L1.254 2.25H8.08l4.713 6.231zm-1.161 17.52h1.833L7.084 4.126H5.117z"/></svg>
    </a>
    <a href="#" aria-label="Share on LinkedIn" class="inline-flex h-10 w-10 items-center justify-center rounded-full border border-gray-200 text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 focus-visible:ring-offset-2 focus-visible:ring-offset-white dark:border-gray-800 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-gray-100 dark:focus-visible:ring-blue-400 dark:focus-visible:ring-offset-gray-950">
      <svg viewBox="0 0 24 24" class="h-4 w-4" fill="currentColor" aria-hidden="true"><path d="M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85 3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433a2.062 2.062 0 01-2.063-2.065 2.064 2.064 0 112.063 2.065zm1.782 13.019H3.555V9h3.564v11.452zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.225 0z"/></svg>
    </a>
    <a href="#" aria-label="Share on Facebook" class="inline-flex h-10 w-10 items-center justify-center rounded-full border border-gray-200 text-gray-600 transition-colors hover:bg-gray-100 hover:text-gray-900 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-600 focus-visible:ring-offset-2 focus-visible:ring-offset-white dark:border-gray-800 dark:text-gray-400 dark:hover:bg-gray-800 dark:hover:text-gray-100 dark:focus-visible:ring-blue-400 dark:focus-visible:ring-offset-gray-950">
      <svg viewBox="0 0 24 24" class="h-4 w-4" fill="currentColor" aria-hidden="true"><path d="M24 12.073c0-6.627-5.373-12-12-12s-12 5.373-12 12c0 5.99 4.388 10.954 10.125 11.854v-8.385H7.078v-3.47h3.047V9.43c0-3.007 1.792-4.669 4.533-4.669 1.312 0 2.686.235 2.686.235v2.953H15.83c-1.491 0-1.956.925-1.956 1.874v2.25h3.328l-.532 3.47h-2.796v8.385C19.612 23.027 24 18.062 24 12.073z"/></svg>
    </a>
  </aside>
  <article class="prose min-w-0 flex-1 text-sm leading-relaxed text-gray-700 dark:text-gray-300">
    <p>Your article body goes here. As the reader scrolls, the share rail on the left stays pinned within this row.</p>
  </article>
</div>