* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
  }
  
  body {
    background-color: #f5f5f5;
    padding: 20px;
  }
  
  .container {
    max-width: 400px;
    background: white;
    padding: 30px;
    margin: auto;
    border-radius: 10px;
    box-shadow: 0 5px 10px rgba(0,0,0,0.1);
  }
  
  h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
  }
  
  .input-group {
    display: flex;
    margin-bottom: 20px;
  }
  
  #taskInput {
    flex: 1;
    padding: 10px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 6px 0 0 6px;
  }
  
  button {
    padding: 10px 20px;
    border: none;
    background: #28a745;
    color: white;
    font-weight: bold;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
  }
  
  button:hover {
    background: #218838;
  }
  
  ul {
    list-style: none;
  }
  
  li {
    padding: 10px;
    background: #eee;
    margin-bottom: 10px;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  li.completed {
    text-decoration: line-through;
    color: gray;
  }
  
  .delete-btn {
    background: #dc3545;
    border: none;
    color: white;
    padding: 6px 10px;
    border-radius: 4px;
    cursor: pointer;
  }
  
  .delete-btn:hover {
    background: #c82333;
  }