fixes

libs/ui/src/lib/landing/LandingPage.tsx

@@ -234,7 +234,18 @@ function Header({
               </Button>
             ) : (
               <>
-                <Button component={Link} to={primaryHref} variant="subtle" size="sm" visibleFrom="xs">
+                {/* Login is the secondary action next to Sign Up when both
+                    exist (portal) — but when there's no signup (backoffice,
+                    enableSignup: false), it's the only action, so it takes
+                    the filled/primary treatment instead of reading like a
+                    leftover half of a pair. */}
+                <Button
+                  component={Link}
+                  to={primaryHref}
+                  variant={signupHref ? 'subtle' : 'filled'}
+                  size="sm"
+                  visibleFrom="xs"
+                >
                   {t('landing.auth.login')}
                 </Button>
                 {signupHref && (