fixed cooperate play

src/states/MenuState.h

@@ -19,6 +19,9 @@ public:
     void showHelpPanel(bool show);
     // Show or hide the inline ABOUT panel (menu-style)
     void showAboutPanel(bool show);
+
+    // Show or hide the inline COOPERATE setup panel (2P vs AI).
+    void showCoopSetupPanel(bool show);
     
 private:
     int selectedButton = 0; // 0=PLAY,1=COOPERATE,2=CHALLENGE,3=LEVEL,4=OPTIONS,5=HELP,6=ABOUT,7=EXIT
@@ -94,4 +97,14 @@ private:
     double aboutTransition = 0.0; // 0..1
     double aboutTransitionDurationMs = 360.0;
     int aboutDirection = 1; // 1 show, -1 hide
+
+    // Coop setup panel (inline HUD like Exit/Help)
+    bool coopSetupVisible = false;
+    bool coopSetupAnimating = false;
+    double coopSetupTransition = 0.0; // 0..1
+    double coopSetupTransitionDurationMs = 320.0;
+    int coopSetupDirection = 1; // 1 show, -1 hide
+    int coopSetupSelected = 0; // 0 = 2 players, 1 = AI
+    SDL_FRect coopSetupBtnRects[2]{};
+    bool coopSetupRectsValid = false;
 };