body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f5f6fa;
  color: #2f3640;
}
h1 {
  font-size: 1.5rem;
}
header {
  background: #b7c8f5;
  color: white;
  padding: 20px;
  text-align: center;
}

nav {
  background: #40739e;
  padding: 10px;
  text-align: center;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 15px;
  font-weight: bold;
}

main {
  max-width: 1000px;
  margin: 30px auto;
  padding: 20px;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

th, td {
  border: 1px solid #ddd;
  padding: 10px;
}

th {
  background: #f1f2f6;
}

footer {
  margin-top: 40px;
  background: #273c75;
  color: white;
  text-align: center;
  padding: 15px;
  font-size: 14px;
}