Draw the header's outward links so they look like what they are

Two faults in the first cut, both only visible in a browser: the hairline
before "More apps" was a border-left on a pill-shaped link, so it came out
as a crescent; and `nav.site a` is more specific than `.button`, so the
App Store button wore the navigation's grey text instead of its own.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BHqBkVbnKPqL7qKAQethGK

Author: ikunin

appsite/assets/style.css

@@ -153,20 +153,35 @@ nav.site a[aria-current="page"] {
   background: rgba(255, 255, 255, 0.09);
 }
 
-/* The two links that leave this site: the other apps, and the App Store. Set
-   off from the pages of this site by a rule, so the nav does not read as one
-   undifferentiated row of seven. */
-nav.site .away, nav.site .button {
-  margin-left: 0.35rem;
-  border-left: 1px solid var(--line);
-  padding-left: 0.85rem;
+/* The two links that leave this site: the other apps, and the App Store. A
+   hairline sets them off, so the header does not read as one undifferentiated
+   row of seven. It is drawn as a pseudo-element rather than a border, because
+   these pills are pill-shaped and a border-left comes out as a crescent. */
+nav.site .away {
+  position: relative;
+  margin-left: 0.75rem;
+}
+
+nav.site .away::before {
+  content: "";
+  position: absolute;
+  left: -0.45rem;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 1px;
+  height: 1.15rem;
+  background: var(--line);
 }
 
+/* `nav.site a` is more specific than `.button`, so the header's button has to
+   name its own colours or it comes out in the navigation's grey. */
 nav.site .button {
-  border-left: 0;
-  padding-left: 1rem;
+  color: var(--accent-ink);
+  margin-left: 0.5rem;
 }
 
+nav.site .button:hover { color: var(--accent-ink); background: var(--accent); }
+
 /* The header's own size of button: the page's call to action is in the hero,
    and this one must not shout over it. */
 .button.small {