body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #beb9b9;
    gap: 2rem;
  }
  
  .mode-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    opacity: 0;
  }
  
  .mode-label {
    position: absolute;
    top: 20px;
    right: 45px;
    font-size: 20px;
    color: #fffefe;
    cursor: pointer;
  }
  
  .calculator {
    width: 320px;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.1);
    background-color: #ffffff;
    transition: background-color 0.3s ease;
  }
  
  .calculator.dark {
    background-color: #333333;
  }
  
  h2 {
    font-size: 24px;
    color: #333333;
    margin-bottom: 20px;
  }
  
  h2.dark {
    color: #ffffff;
  }
  
  .input-group {
    margin-bottom: 20px;
  }
  
  .input-group label {
    display: block;
    font-size: 14px;
    color: #666666;
    margin-bottom: 5px;
  }
  
  .input-group input {
    width: calc(100% - 20px);
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #cccccc;
    font-size: 16px;
  }
  
  .button {
    width: 100%;
    padding: 12px;
    background-color: #007bff;
    color: #ffffff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  .button:hover {
    background-color: #0056b3;
  }
  
  .result {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #cccccc;
  }
  
  .result p {
    font-size: 16px;
    color: #333333;
    margin-bottom: 10px;
  }
  
  .result p.dark {
    color: #ffffff;
  }
  
  .result span {
    font-weight: bold;
    color: #007bff;
  }
  
  .result span.dark {
    color: #ffffff;
  }
  .dark-mode .calculator {
    background-color: #222222;
  }
  
  .dark-mode h2 {
    color: #ffffff;
  }
  
  .dark-mode .input-group label {
    color: #cccccc;
  }
  
  .dark-mode .button {
    background-color: #0056b3;
  }
  
  .dark-mode .result p {
    color: #ffffff;
  }
  
  .dark-mode .result span {
    color: #ffffff;
  }
  body.dark-mode {
    background-color: #302f2f;
  }