Sponsor strip centred under the masthead, new wording

css/site.css

@@ -872,39 +872,27 @@ html.js [data-rv].rv-in { opacity: 1; transform: none; }
   color: var(--muted);
 }
 
-/* ---------- sponsor line: one line under the wordmark inside the masthead, one in the footer ---------- */
-.mast-brand { display: flex; flex-direction: column; width: max-content; max-width: 100%; }
-.masthead .nav, .masthead .nav-cta { align-self: end; }
-
-.sponsor { padding-top: 9px; }
+/* ---------- sponsor strip: one centred line under the masthead, one in the footer ---------- */
+.sponsor { border-bottom: 1px solid var(--rule); }
 .sponsor p {
-  margin: 0;
-  padding: 0;
+  max-width: var(--max);
+  margin: 0 auto;
+  padding: 10px var(--pad) 11px;
   text-align: center;
   font-size: var(--step-sm);
-  line-height: 1.3;
+  line-height: 1.35;
   color: var(--muted);
 }
-.sponsor-label {
-  font-size: var(--step-xs);
-  letter-spacing: 0.14em;
-  text-transform: uppercase;
-  font-weight: 600;
-  color: var(--oak);
-}
 .sponsor a {
   color: var(--ink);
   text-decoration-color: var(--oak);
   text-underline-offset: 3px;
-  white-space: nowrap;
 }
 .sponsor a:hover { color: var(--navy); }
-.sponsor-note { opacity: 0.72; }
 .sponsor-foot {
   margin: 10px 0 0;
   font-size: var(--step-sm);
   color: rgba(246, 236, 218, 0.72);
 }
-.sponsor-foot .sponsor-label { margin-right: 6px; color: var(--sand); }
 .sponsor-foot a { color: rgba(246, 236, 218, 0.92); text-decoration-color: var(--oak); text-underline-offset: 3px; }
 .sponsor-foot a:hover { color: var(--sand); }