 // Show user info
        function showUserInfo() {
            if (currentUser) {
                const username = currentUser.username || currentUser.signInMethod || 'U';
                document.getElementById('userAvatar').textContent = username.charAt(0).toUpperCase();
                
                // Update wallet info display
                if (currentUser.address) {
                    document.getElementById('walletAddress').textContent = 
                        currentUser.address.substring(