body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
  line-height: 1.6;
  color: #222;
}

header {
  margin-bottom: 40px;
}

header h1 {
  font-size: 2.4rem;
  margin-bottom: 5px;
}

header p {
  color: #666;
  font-size: 1.1rem;
}

nav {
  margin-top: 15px;
}

nav a {
  margin-right: 18px;
  text-decoration: none;
  font-weight: 600;
  color: #0056b3;
}

nav a:hover {
  text-decoration: underline;
}

section {
  margin-top: 40px;
}

h2 {
  border-bottom: 2px solid #eee;
  padding-bottom: 6px;
}

table {
  border-collapse: collapse;
  margin-top: 10px;
}

table th, table td {
  border-bottom: 1px solid #ddd;
  padding: 8px 12px;
}

footer {
  margin-top: 60px;
  color: #777;
  font-size: 0.9rem;
}