body {
  margin: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  font-family: sans-serif;
}

#toolbar {
  display: flex;
  padding: 5px;
  gap: 5px;
  background: #333;
  color: #fff;
}

#editor-container {
  flex: 1;
  display: flex;
  height: calc(100% - 40px); /* toolbar height approx */
}

#editor,
#output {
  flex: 1; /* Each takes 50% dynamically */
  height: 100%;
}

#editor {
  border-right: 1px solid #ccc;
}

#output {
  border-left: 1px solid #ccc;
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.line-highlight {
  background-color: rgba(255, 255, 0, 0.3);
}