/* Main App Screen */
    #appScreen {
        display: none;
    }
    
    .app-header {
        background: white;
        padding: 15px 30px;
        box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .app-header h1 {
        color: #333;
        font-size: 24px;
    }
    
    .header-actions {
        display: flex;
        gap: 10px;
        align-items: center;
    }