site: fix mobile nav overflow + center navbar logo cursor

- nav-cta: shrink + wrap the github url under 800px so the long
  URL no longer forces the viewport wider than the screen (the
  full links + url stopped fitting around ~795px, e.g. iPad portrait)
- brand mark: sit the block cursor on the baseline instead of the
  line-box center so it lines up with the "lc" glyphs (scoped to
  the nav so hero/footer cursors are unchanged)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: itayinbarr

site/site.css

@@ -174,6 +174,13 @@ a { color: inherit; text-decoration: none; }
   display: inline-flex;
   align-items: center;
 }
+/* optically center the block cursor against the "lc" glyphs:
+   sit it on the baseline rather than the line-box center, which
+   has empty descender space that drags the default centering low */
+.nav .brand .mark .cursor {
+  height: 0.74em;
+  transform: translateY(-0.07em);
+}
 .nav .brand-name {
   font-size: 14px;
   color: var(--ink-60);
@@ -1083,8 +1090,23 @@ body.show-grid::after {
   .install-grid { grid-template-columns: 1fr; }
   .comm-grid { grid-template-columns: 1fr; }
 }
-@media (max-width: 760px) {
+/* nav collapses a touch earlier than the content grids: the full
+   links + full github url stop fitting on one row just under ~800px */
+@media (max-width: 800px) {
   .nav-links { display: none; }
+  /* let the github cta shrink + wrap inside the remaining width
+     instead of forcing the page wider than the viewport */
+  .nav { gap: 16px; }
+  .nav-cta {
+    min-width: 0;
+    font-size: 12px;
+    padding: 7px 11px;
+    line-height: 1.4;
+    text-align: right;
+  }
+  .nav-cta > span:first-child { overflow-wrap: anywhere; }
+}
+@media (max-width: 760px) {
   .bench-row { grid-template-columns: 1fr; }
   .bench-num { text-align: left; min-width: 0; }
   .feat-grid, .prin-grid { grid-template-columns: 1fr; }