body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f7f7f7;
}

header {
  background-color: #333;
  color: white;
  padding: 1rem;
}

header h1 {
  margin: 0;
}

nav a {
  color: white;
  margin-right: 1rem;
  text-decoration: none;
}

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

main {
  padding: 1.5rem;
}

.pdf-list {
  list-style: none;
  padding: 0;
}

.pdf-item {
  background-color: white;
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.pdf-item h2 {
  margin-top: 0;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #eee;
  margin-top: 2rem;
}