diff --git a/cmd/sojuboy/main.go b/cmd/sojuboy/main.go
index 51a55cd..7c14f98 100644
--- a/cmd/sojuboy/main.go
+++ b/cmd/sojuboy/main.go
@@ -122,6 +122,7 @@ func main() {
 		Commit:            commit,
 		BuiltAt:           builtAt,
 		StartedAt:         time.Now(),
+		KnownChannels:     cfg.Channels,
 	}
 	go func() {
 		if err := api.Start(ctx); err != nil && err != http.ErrServerClosed {
diff --git a/internal/httpapi/server.go b/internal/httpapi/server.go
index 05004d9..801ad33 100644
--- a/internal/httpapi/server.go
+++ b/internal/httpapi/server.go
@@ -40,6 +40,8 @@ type Server struct {
 	Commit    string
 	BuiltAt   string
 	StartedAt time.Time
+	// Optional seed list from config for /api/channels when DB is empty
+	KnownChannels []string
 }
 
 func (s *Server) Start(ctx context.Context) error {
@@ -217,6 +219,10 @@ func (s *Server) handleUI(w http.ResponseWriter, r *http.Request) {
     body { padding: 1rem; }
     pre { max-height: 50vh; overflow: auto; }
     .row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
+    @media (max-width: 768px) {
+      .grid { grid-template-columns: 1fr !important; }
+      pre { max-height: 40vh; }
+    }
   </style>
   <script>
     const st={token: localStorage.getItem('token')||''};
@@ -328,6 +334,9 @@ func (s *Server) handleChannels(w http.ResponseWriter, r *http.Request) {
 		_, _ = w.Write([]byte("store error"))
 		return
 	}
+	if len(chs) == 0 && len(s.KnownChannels) > 0 {
+		chs = append(chs, s.KnownChannels...)
+	}
 	w.Header().Set("Content-Type", "application/json")
 	_ = json.NewEncoder(w).Encode(chs)
 }