body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #fff;
  color: #333;
  line-height: 1.6;
}

header {
  background-color: #0b5fff;
  color: white;
  padding: 16px;
  text-align: center;
}

header h1 {
  margin: 0;
}

nav a {
  color: white;
  margin: 0 10px;
  text-decoration: none;
}

main {
  max-width: 900px;
  margin: 20px auto;
  padding: 0 16px;
}

h2 {
  color: #0b2540;
}

footer {
  text-align: center;
  padding: 16px;
  background: #f6f7fb;
}

footer p {
  margin: 0;
}

.warning {
  border-left: 4px solid #b00;
  background: #fff0f0;
  padding: 12px;
  margin-top: 20px;
}