small changes to .sky-field styling

src/static_src/scss/_sky.scss

@@ -243,7 +243,11 @@ html.sky-open .sky-modal-wrap {
             // while leaving the placeholder copy clearly readable
             // (0.85 × 0.54 ≈ 0.46, parity w. birth-place's ~0.54).
             opacity: 0.85;
+            &:focus {
+                border-color: rgba(var(--secUser), 0.75);
+                box-shadow: 0 0 0.75rem rgba(var(--secUser), 0.5);
                 color: inherit;
+            }
             cursor: default;
         }
     }