body {
  margin: 0;
  padding: 20px;
  font-family: Arial, sans-serif;
}

.container {
  display: flex;
  gap: 20px;
  height: calc(100vh - 40px);
}

.left-panel {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: #f5f5f5;
  border-radius: 8px;
}

.right-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.markdown-preview {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
}

.preview-controls {
  padding: 10px 0;
}

input[type="text"] {
  width: 100%;
  padding: 8px;
  margin-bottom: 10px;
}

button {
  padding: 8px 16px;
  margin: 5px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

button:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.toc-section {
  margin: 20px 0;
}

.generation-controls {
  margin: 20px 0;
}

.status-section {
  margin: 20px 0;
}

#apiStatus {
  padding: 10px;
  margin-top: 10px;
  border-radius: 4px;
}

#apiStatus.loading {
  background: #fff3cd;
  color: #856404;
}

#apiStatus.error {
  background: #f8d7da;
  color: #721c24;
}

.chapter-item {
  margin: 10px 0;
}

.subchapter-item {
  margin: 5px 0 5px 20px;
}

.editable {
  padding: 5px;
  border: 1px solid transparent;
}

.editable:hover {
  border: 1px solid #ddd;
  background: white;
}

.book-entry {
  padding: 10px;
  margin: 10px 0;
  background: white;
  border-radius: 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.book-info {
  flex-grow: 1;
}

.book-title {
  font-weight: bold;
}

.book-stats {
  font-size: 0.9em;
  color: #777;
}

.book-controls {
  display: flex;
  gap: 10px;
}

.library-sort-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}