body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 0;
  }
  
  header {
    background-color: #0a1f44; /* azul naval */
    color: white;
    padding: 1.5rem;
    text-align: center;
  }
  
  main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 1rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
  }
  
  #reader {
    width: 100%;
    height: auto;
    margin-bottom: 2rem;
  }
  
  form {
    display: flex;
    flex-direction: column;
  }
  
  label {
    margin-top: 1rem;
    font-weight: bold;
  }
  
  input {
    padding: 0.6rem;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  button {
    margin-top: 2rem;
    padding: 0.8rem;
    background-color: #0a1f44;
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
  }
  
  button:hover {
    background-color: #143166;
  }
  
  #mensagem-sucesso {
    margin-top: 1rem;
    color: green;
    font-weight: bold;
  }