:root{
    --primary-color: black;
    --second-color: white;
    --third-color: crimson;

    --font-family:'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: var(--font-family);
    background-color: var(--primary-color);
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    flex-direction: column;
  }
  
  .container {
    background-color: var(--second-color);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 100%;
    text-align: center;
  }
  
  h1 {
    font-size: 24px;
    color: var(--third-color);
    margin-bottom: 20px;
  }
  
  /* Estilo para el formulario */
  form {
    margin-bottom: 20px;
  }
  
  input[type="number"] {
    width: 100%;
    padding: 10px;
    font-size: 16px;
    border: 1px solid var(--primary-color);
    border-radius: 5px;
    margin-bottom: 10px;
    transition: border-color 0.3s;
  }
  
  input[type="number"]:focus {
    border-color: var(--third-color);
    outline: none;
  }
  
  button {
    background-color: var(--third-color);
    color: white;
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  
  button:hover {
    background-color: var(--primary-color);
  }
  
  /* Mensajes */
  #mensaje {
    margin-top: 20px;
    font-size: 18px;
    font-weight: bold;
    color: var(--third-color);
  }
  

  @media (max-width: 600px) {
    h1 {
      font-size: 20px;
    }
  
    input[type="number"] {
      font-size: 14px;
      padding: 8px;
    }
  
    button {
      font-size: 14px;
      padding: 8px 16px;
    }
  
    #mensaje {
      font-size: 16px;
    }
  }