body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 0;
  padding: 20px;
  background: #d9f5c0;
  min-height: 100vh;
}
.container {
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  max-width: none;
  width: calc(100% - 40px);
}
.header {
  margin-bottom: 20px;
}
.main-content {
  display: flex;
  gap: 20px;
  flex: 1;
}
.left-column {
  flex: 1;
  min-width: 200px;
}
.right-column {
  flex: 1;
  min-width: 0;
}
h1 {
  color: #2c3e50;
  margin: 0;
}
.upload-area {
  border: 2px dashed #ccc;
  border-radius: 4px;
  padding: 20px;
  text-align: center;
  margin-bottom: 20px;
  cursor: pointer;
}
.upload-area.dragover {
  border-color: #2980b9;
  background: #ecf0f1;
}
.chapters-list {
  margin-top: 20px;
}
.chapter-item:not(:last-child) {
  padding: 1px;
  border-bottom: 1px solid #eee;
}
.chapter-item:hover {
  background: #f8f9fa;
}
.token-count {
  margin-left: auto;
  color: #666;
}
#actions {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  visibility: hidden;
}
button {
  background: #2980b9;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
}
button:hover {
  background: #3498db;
}
button:disabled {
  background: #bdc3c7;
  cursor: not-allowed;
}
#output {
  margin-top: 20px;
  padding: 10px;
  border: 1px solid #eee;
  border-radius: 4px;
  white-space: pre-wrap;
  display: none;
  max-height: 600px;
  overflow-y: auto;
}
.loading {
  display: none;
  text-align: center;
  margin: 20px 0;
}
.chapter-list {
  list-style: none;
  padding: 0;
  margin: 0;
  line-height: 1.6;
}
.chapter-list .sublist {
  margin: 0.2em 0 0.2em 1.5em;
}
.chapter-item {
  margin: 0;
}
.chapter-row {
  display: flex;
  align-items: center;
}
.collapse-button {
  padding: 0;
  width: 20px;
  height: 20px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.8em;
  color: #666;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 10px;
}
.collapse-button:hover {
  color: #000;
}
.collapse-spacer {
  width: 30px;
}
.chapter-row label {
  cursor: pointer;
  margin-left: 0.5em;
}
input[data-is-section="true"] + label {
  font-weight: 600;
}
.toc-checkbox {
  margin: 0;
  cursor: pointer;
}
#selectAllButton {
  background: #34495e;
  font-size: 0.9em;
  padding: 8px 16px;
}
#selectAllButton:hover {
  background: #2c3e50;
}
#tokenCount {
  margin: 10px 0;
  padding: 5px;
  font-weight: bold;
  color: #333;
}

.format-options {
  margin: 10px 0;
  padding: 10px;
  background: #f8f9fa;
  border-radius: 4px;
  border: 1px solid #e9ecef;
}

.format-options label {
  margin-right: 15px;
  cursor: pointer;
  font-size: 0.9em;
}

.format-options input[type="radio"] {
  margin-right: 5px;
}