.pdf-preview-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 2rem;
  margin-top: 4rem;
}

.thumbnail-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.thumbnail-column img {
  width: 100px;
  height: 140px;
  object-fit: cover;
  border-radius: 6px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color 0.3s, transform 0.3s;
}

.thumbnail-column img:hover {
  border-color: #0077b6;
  transform: scale(1.05);
}

.main-preview {
  flex-grow: 1;
  max-width: 700px;
  position: relative;
}

.main-preview img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
  transition: opacity 0.3s;
}

.action-buttons {
  margin-top: 2rem;
  text-align: center;
}

.btn-primary {
  background-color: #0077b6;
  border: none;
}

.btn-outline-secondary {
  border: 1px solid #0077b6;
  color: #0077b6;
}

.btn-outline-secondary:hover {
  background-color: #0077b6;
  color: white;
}