/* Reset some default styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f2f2f2;
    color: #333;
    display: flex;
    justify-content: center;
    padding: 40px;
  }
  
  .container {
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
  }
  
  h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #4a4a4a;
  }
  
  .balance {
    text-align: center;
    margin: 20px 0;
  }
  
  .summary {
    display: flex;
    justify-content: space-between;
    margin: 20px 0;
    background-color: #fafafa;
    padding: 10px 20px;
    border-radius: 8px;
    box-shadow: inset 0 0 5px rgba(0,0,0,0.05);
  }
  
  .summary div {
    text-align: center;
  }
  
  .plus {
    color: #2ecc71;
    font-weight: bold;
  }
  
  .minus {
    color: #e74c3c;
    font-weight: bold;
  }
  
  .list {
    list-style-type: none;
    margin-bottom: 30px;
    max-height: 200px;
    overflow-y: auto;
  }
  
  .list li {
    background-color: #fefefe;
    padding: 10px;
    margin: 10px 0;
    border-right: 5px solid;
    display: flex;
    justify-content: space-between;
    border-radius: 6px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.05);
  }
  
  .list li.plus {
    border-color: #2ecc71;
  }
  
  .list li.minus {
    border-color: #e74c3c;
  }
  
  form {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  form input[type="text"],
  form input[type="number"] {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 1rem;
  }
  
  form button {
    padding: 10px;
    background-color: #4a90e2;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s ease;
  }
  
  form button:hover {
    background-color: #357abd;
  }