.designer-container {
    display: grid;
    grid-template-columns: 200px 1fr 300px;
    height: calc(100vh - 80px);
}

.toolbox {
    background: #f5f5f5;
    padding: 10px;
    border-right: 1px solid #ddd;
}

.toolbox-item {
    width: 100%;
    margin-bottom: 5px;
}

.canvas-container {
    background: #fafafa;
}

.properties-panel {
    padding: 10px;
    border-left: 1px solid #ddd;
    background: #fff;
}