diff --git a/internal/services/project.go b/internal/services/project.go
index 3d67188..d5f3421 100644
--- a/internal/services/project.go
+++ b/internal/services/project.go
@@ -21,6 +21,7 @@ var (
 	ErrProjectCodeExists       = errors.New("project code and variant already exist")
 	ErrCannotDeleteMainVariant = errors.New("cannot delete main variant")
 	ErrReservedMainVariant     = errors.New("variant name 'main' is reserved")
+	ErrCannotRenameMainVariant = errors.New("cannot rename main variant")
 )
 
 type ProjectService struct {
@@ -108,7 +109,12 @@ func (s *ProjectService) Update(projectUUID, ownerUsername string, req *UpdatePr
 		localProject.Code = code
 	}
 	if req.Variant != nil {
-		localProject.Variant = strings.TrimSpace(*req.Variant)
+		newVariant := strings.TrimSpace(*req.Variant)
+		// Block renaming of the main variant (empty Variant) — there must always be a main.
+		if strings.TrimSpace(localProject.Variant) == "" && newVariant != "" {
+			return nil, ErrCannotRenameMainVariant
+		}
+		localProject.Variant = newVariant
 		if err := validateProjectVariantName(localProject.Variant); err != nil {
 			return nil, err
 		}
diff --git a/web/templates/index.html b/web/templates/index.html
index 7a9c025..0434dc6 100644
--- a/web/templates/index.html
+++ b/web/templates/index.html
@@ -477,6 +477,7 @@ function updateConfigBreadcrumbs() {
     configEl.textContent = truncateBreadcrumbSpecName(fullConfigName);
     configEl.title = fullConfigName;
     versionEl.textContent = 'main';
+    document.title = code + ' / ' + variant + ' / ' + fullConfigName + ' — QuoteForge';
     const configNameLinkEl = document.getElementById('breadcrumb-config-name-link');
     if (configNameLinkEl && configUUID) {
         configNameLinkEl.href = '/configs/' + configUUID + '/revisions';
diff --git a/web/templates/project_detail.html b/web/templates/project_detail.html
index b59b457..b060214 100644
--- a/web/templates/project_detail.html
+++ b/web/templates/project_detail.html
@@ -363,6 +363,7 @@ function renderVariantSelect() {
         if (item.uuid === projectUUID) {
             option.className += ' font-semibold text-gray-900';
             label.textContent = variantLabel;
+            document.title = (project && project.code ? project.code : '—') + ' / ' + variantLabel + ' — QuoteForge';
         }
         option.textContent = variantLabel;
         option.onclick = function() {