* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  width: 800px;
  height: 500px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

.pane {
  width: 50%;
  height: 100%;
  overflow: auto;
}

.input-pane {
  border-right: 1px solid #e1e4e8;
}

#markdown-input {
  width: 100%;
  height: 100%;
  padding: 16px;
  border: none;
  resize: none;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 14px;
  line-height: 1.5;
  background-color: #f6f8fa;
}

#markdown-input:focus {
  outline: none;
}

.preview-pane {
  padding: 16px;
  background-color: #ffffff;
}

.markdown-body {
  font-size: 14px;
  line-height: 1.5;
}

.toolbar {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 0 12px;
  background-color: #f6f8fa;
  border-top: 1px solid #e1e4e8;
}

.toolbar button {
  padding: 6px 12px;
  border: 1px solid #e1e4e8;
  border-radius: 6px;
  background-color: #ffffff;
  font-size: 12px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.toolbar button:hover {
  background-color: #f3f4f6;
}