body {
  font-family: Arial, sans-serif;
  margin: 0;
  line-height: 1.5;
  background: #f4f4f4;
  color: #222;
}

header, main, footer {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

header h1 {
  margin: 0 0 10px 0;
}

nav {
  background: #222;
  padding: 10px;
  border-radius: 8px;
}

nav a {
  margin-right: 12px;
  text-decoration: none;
  color: white;
  padding: 6px 10px;
  border-radius: 6px;
}

nav a:hover {
  background: #444;
  text-decoration: none;
}

main {
  background: white;
  border: 1px solid #ddd;
  border-radius: 10px;
  margin-top: 16px;
}

footer {
  color: #666;
  font-size: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  border: 1px solid #ddd;
  padding: 8px;
}

th {
  background: #f0f0f0;
}