* {
    box-sizing: border-box;
  }
  
  body {
    font-family: sans-serif;
    background: #f0f2f5;
    margin: 0;
    padding: 20px;
  }
  
  .board {
    display: flex;
    gap: 20px;
  }
  
  .column {
    background: #fff;
    border-radius: 10px;
    padding: 10px;
    width: 30%;
    min-height: 300px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
  }
  
  .column h2 {
    text-align: center;
    margin-bottom: 10px;
  }
  
  .task {
    background: #3498db;
    color: white;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 10px;
    cursor: grab;
  }
  
  .task.dragging {
    opacity: 0.5;
  }
  
  .column.over {
    background-color: #e0e0e0;
  }