body {
  margin: 0;
  padding: 20px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f8f9fa;
  color: #333;
}

.container {
  display: flex;
  gap: 20px;
  height: calc(100vh - 40px);
  max-width: 1400px;
  margin: 0 auto;
}

.left-panel {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.right-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  background: #fff;
}

.markdown-preview {
  flex: 1;
  overflow-y: auto;
  padding: 30px;
  background: white;
  border-radius: 0 0 10px 10px;
}

.preview-controls {
  padding: 15px;
  background: #f8f9fa;
  border-radius: 10px 10px 0 0;
  display: flex;
  justify-content: flex-end;
}

h1 {
  color: #2c3e50;
  border-bottom: 2px solid #ecf0f1;
  padding-bottom: 10px;
  margin-top: 0;
}

h2 {
  color: #34495e;
  margin-top: 25px;
}

.input-group {
  margin-bottom: 10px;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
  color: #555;
}

.title-inputs {
  display: flex;
  gap: 15px;
  margin-bottom: 10px;
}

.title-inputs .input-group {
  flex: 1;
}

input[type="text"] {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 16px;
  transition: border-color 0.3s;
}

input[type="text"]:focus {
  border-color: #007bff;
  outline: none;
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

button {
  padding: 10px 18px;
  margin: 5px 5px 5px 0;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background 0.2s;
}

button:hover {
  background: #0069d9;
}

button:disabled {
  background: #bbd6f6;
  cursor: not-allowed;
}

.delete-btn {
  background-color: #dc3545;
}

.delete-btn:hover {
  background-color: #c82333;
}

.toc-section {
  margin: 25px 0;
}

.toc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

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

.progress-stats {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-weight: 500;
}

.progress-bar-container {
  height: 8px;
  background-color: #e9ecef;
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background-color: #28a745;
  transition: width 0.3s ease;
}

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

#apiStatus {
  padding: 10px;
  margin-top: 10px;
  border-radius: 6px;
  font-weight: 500;
}

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

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

.chapter-item {
  margin: 15px 0;
  padding: 10px;
  background: #f8f9fa;
  border-radius: 6px;
}

.subchapter-item {
  margin: 8px 0 8px 20px;
  padding: 8px;
  background: #ffffff;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.editable {
  padding: 8px;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: all 0.2s;
}

.editable:hover {
  border: 1px solid #007bff;
  background: white;
  cursor: pointer;
}

.book-entry {
  padding: 15px;
  margin: 15px 0;
  background: white;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  transition: transform 0.2s;
}

.book-entry:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

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

.book-title {
  font-weight: bold;
  font-size: 18px;
  color: #2c3e50;
  margin-bottom: 4px;
}

.book-subtitle {
  color: #7f8c8d;
  font-size: 14px;
  margin-bottom: 8px;
}

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

.book-progress {
  margin-bottom: 5px;
}

.progress-bar-mini-container {
  height: 6px;
  background-color: #e9ecef;
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 5px;
  width: 100%;
}

.progress-bar-mini {
  height: 100%;
  background-color: #28a745;
  transition: width 0.3s ease;
}

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

.library-sort-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.title-suggestions-container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 15px;
}

.title-suggestion-card {
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 12px;
  cursor: pointer;
  background: white;
  flex: 1;
  min-width: 200px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: all 0.2s;
}

.title-suggestion-card:hover {
  border-color: #007bff;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.title-main {
  font-weight: bold;
  font-size: 16px;
  margin-bottom: 5px;
  color: #2c3e50;
}

.title-subtitle {
  font-size: 14px;
  color: #7f8c8d;
}

.markdown-preview h1 {
  font-size: 2.5em;
  border-bottom: 2px solid #eaecef;
  padding-bottom: 0.3em;
  margin-top: 0;
}

.markdown-preview h2 {
  font-size: 1.8em;
  border-bottom: 1px solid #eaecef;
  padding-bottom: 0.3em;
}

.markdown-preview h3 {
  font-size: 1.5em;
}

.markdown-preview p {
  line-height: 1.6;
  margin: 1em 0;
}

.markdown-preview blockquote {
  border-left: 4px solid #dfe2e5;
  padding-left: 1em;
  color: #6a737d;
  margin: 1em 0;
}

.markdown-preview code {
  background-color: rgba(27,31,35,.05);
  border-radius: 3px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 85%;
  margin: 0;
  padding: 0.2em 0.4em;
}

.markdown-preview pre {
  background-color: #f6f8fa;
  border-radius: 3px;
  font-size: 85%;
  line-height: 1.45;
  overflow: auto;
  padding: 16px;
}

.markdown-preview ul, 
.markdown-preview ol {
  padding-left: 2em;
}

.markdown-preview a {
  color: #0366d6;
  text-decoration: none;
}

.markdown-preview a:hover {
  text-decoration: underline;
}

#previewTitle {
  text-align: center;
  margin-bottom: 30px;
}

#previewTitle h1 {
  margin-bottom: 5px;
  border-bottom: none;
}

#previewTitle h2 {
  font-weight: normal;
  color: #5a6268;
  font-size: 1.3em;
  margin-top: 0;
  border-bottom: none;
}

.toc-link {
  display: block;
  color: #333;
  text-decoration: none;
  padding: 8px;
  border-radius: 4px;
  transition: all 0.2s;
}

.toc-link:hover {
  background-color: #f1f1f1;
  color: #007bff;
}

.chapter-link {
  font-weight: 600;
}

.subchapter-link {
  font-size: 0.95em;
  padding-left: 12px;
}

.back-to-toc {
  display: inline-block;
  margin-left: 10px;
  font-size: 0.8em;
  color: #007bff;
  text-decoration: none;
}

.toggle-mode-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
  font-weight: 500;
}

.edit-mode {
  background-color: #007bff;
  color: white;
}

.view-mode {
  background-color: #28a745;
  color: white;
}

#tocEditor.edit-mode .toc-link {
  cursor: text;
}

#tocEditor.view-mode .toc-link {
  cursor: pointer;
}