* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f2f2f2;
  color: #333;
}

header {
  background-image: url("res/aviao.jpg");
  background-size: cover;
  background-position: center;
  padding: 3.75rem 1.25rem; 
  text-align: center;
  color: white;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

header h1 {
  font-size: 2.5em;
  margin-bottom: 0.625rem;
  text-shadow: 2px 2px 4px #000;
}

header p {
  max-width: 43.75rem; 
  margin: auto;
  font-size: 1.1em;
  background-color: rgba(0, 0, 0, 0.5);
  padding: 1rem; 
  border-radius: 0.625rem; 
}

main {
  padding: 1.875rem 1.25rem;
  display: flex;
  justify-content: center;
}

fieldset {
  border: none;
  background-color: white;
  padding: 1.875rem;
  border-radius: 0.9375rem; 
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 31.25rem; 
}

div {
  margin-bottom: 1.25rem; 
}

label {
  color: #003366;
}

input[type="text"],
input[type="email"],
input[type="password"] {
  width: 100%;
  padding: 0.625rem;
  border-radius: 0.5rem; 
  font-size: 1em;
}

button {
  background-color: #003366;
  color: white;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1em;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #003366;
  transform: scale(1.1);
}

footer {
  text-align: center;
  padding: 1.25rem; 
  color: #777;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 2em;
  }

  header p {
    font-size: 1em;
    padding: 0.625rem;
  }

  main {
    padding: 1.25rem 0.625rem;
  }

  fieldset {
    padding: 1.25rem;
  }

  input,
  button {
    font-size: 0.95em;
  }
}

@media (max-width: 480px) {
  header {
    padding: 2.5rem 1rem;
  }

  header h1 {
    font-size: 1.6em;
  }

  header p {
    font-size: 0.95em;
  }

  button {
    width: 100%;
  }
}