* { box-sizing: border-box }
body {
  max-width: 1100px;
  margin: auto;
  padding: 1rem;
  font: 14px system-ui, sans-serif;
  color: #222;
}
header, .row {
  display: flex;
  gap: .5rem;
  align-items: center;
}
header { justify-content: space-between }
main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
section {
  border: 1px solid #ccc;
  padding: 1rem;
}
textarea, input {
  width: 100%;
  margin: .25rem 0;
  padding: .5rem;
}
button, .button {
  display: inline-block;
  padding: .5rem .75rem;
  border: 1px solid #999;
  background: #eee;
  cursor: pointer;
}
pre {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  max-height: 500px;
  overflow: auto;
}
.agent {
  border-bottom: 1px solid #ddd;
  padding: .5rem 0;
}
.error { color: #b00 }
@media (max-width: 750px) {
  main { grid-template-columns: 1fr }
}