body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f9f9f9;
  color: #333;
}

.container {
  max-width: 1000px;
  margin: 40px auto;
  padding: 20px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

h2 {
  text-align: center;
  color: #003399;
  margin-bottom: 10px;
}

p {
  text-align: center;
  margin-bottom: 30px;
  font-size: 16px;
}

.filter-form {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}

.filter-form select,
.filter-form button {
  padding: 8px 12px;
  font-size: 16px;
  border-radius: 5px;
  border: 1px solid #ccc;
}

.filter-form button {
  background-color: #007bff;
  color: white;
  border: none;
  cursor: pointer;
  transition: background 0.3s;
}

.filter-form button:hover {
  background-color: #0056b3;
}

.pdf-viewer iframe {
  width: 100%;
  height: 400px;
  border: none;
  max-width: 100%;
}

.pdf-viewer {
  width: 100%;
  overflow: auto;
  margin-top: 20px;
}

.pdf-viewer iframe {
  width: 100%;
  height: 500px;
  max-width: 100%;
  border: 1px solid #ccc;
}