body {
  font-family: 'Roboto', Arial, sans-serif;
  margin: 0;
  background: #f7f7f7;
  color: #333;
}

nav {
  text-align: center;
  background: #004a8f;
  padding: 12px 0;
  margin-bottom: 20px;
}

nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #fff;
  font-weight: 500;
}

.banner {
  background: linear-gradient(135deg, #004a8f 0%, #0074d9 100%);
  color: #fff;
  padding: 60px 20px;
  text-align: center;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
  text-align: center;
}

h1, h2 {
  font-weight: 700;
}

img {
  max-width: 100%;
  height: auto;
  border: 1px solid #ccc;
}

pre {
  background: #eee;
  padding: 10px;
  overflow-x: auto;
  text-align: left;
  white-space: pre-wrap;
  word-break: break-word;
}

ul, ol {
  text-align: left;
  display: inline-block;
}

.dica {
  background: #fff3cd;
  border-left: 5px solid #ff9800;
  padding: 15px;
  margin: 20px 0;
  text-align: left;
  display: inline-block;
}