body {
  font-family: "Segoe UI", Arial, sans-serif;
  background-color: #f7f9fb;
  color: #222;
  margin: 0;
  padding: 20px;
}

h1 {
  text-align: center;
  color: #1e3a8a;
  margin-bottom: 20px;
}

.nav-buttons {
  text-align: center;
  margin-bottom: 20px;
}

button {
  background-color: #2563eb;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  cursor: pointer;
  font-size: 15px;
  margin: 5px;
  transition: background-color 0.3s;
}

button:hover {
  background-color: #1d4ed8;
}

.section {
  background: white;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.1);
  padding: 20px;
  margin: 10px auto;
  max-width: 900px;
}

.hidden {
  display: none;
}