fixing style

internal/config/config.go

@@ -10,6 +10,12 @@ type Config struct {
 	HTTPAddr, Profile, ContentFile, PostgresURL    string
 	AllowedOrigins, SSOHeader, SSOToken, SSOCookie string
 	GoLoose                                        GoLooseConfig
+
+	// ThemeBaseURL is the go-bananas origin supplying the shared styling contract.
+	// Empty keeps this application's own fallbacks, which is the safe default: the
+	// stylesheet is written as var(--bn-role, <colour>), so a missing contract
+	// degrades to the palette it always had rather than to an unstyled page.
+	ThemeBaseURL string
 }
 
 // GoLooseConfig describes the Go Loose hosted-login integration. Go Tell is
@@ -39,6 +45,7 @@ func Load() Config {
 		SSOHeader:      get("CMS_SSO_HEADER", "X-SSO-Token"),
 		SSOToken:       get("CMS_SSO_TOKEN", ""),
 		SSOCookie:      get("CMS_SSO_COOKIE", ""),
+		ThemeBaseURL:   get("CMS_THEME_BASE_URL", ""),
 		GoLoose: GoLooseConfig{
 			Tenant:       get("GO_LOOSE_TENANT", "tell"),
 			AuthDomain:   get("GO_LOOSE_AUTH_DOMAIN", "auth.dev"),