body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #222;
}

header {
  background: #1d3557;
  color: white;
  padding: 40px;
  text-align: center;
}

main {
  padding: 20px;
}

.card {
  background: white;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

a {
  color: #1d3557;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}
nav {
  background: #1d3557;
  padding: 15px;
}

nav a {
  color: white;
  text-decoration: none;
  margin-right: 20px;
  font-weight: bold;
}

nav a:hover {
  color: #a8dadc;
}