body {
  font-family: 'Inter', sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}
header, footer {
  background: #2c5364;
  color: white;
  text-align: center;
  padding: 1em;
}
nav {
  background: #203a43;
  padding: 0.5em;
  text-align: center;
}
nav a {
  margin: 0 15px;
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}
nav a:hover {
  text-decoration: underline;
}
main {
  max-width: 900px;
  margin: 2em auto;
  padding: 20px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}