:root {
  font-family: system-ui, sans-serif;
  line-height: 1.45;
}
body {
  max-width: 760px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.card {
  border: 1px solid #ddd;
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}
label, input, button {
  display: block;
}
input {
  margin: 0.5rem 0 1rem;
  padding: 0.65rem;
  width: 100%;
  box-sizing: border-box;
}
button {
  margin: 0.5rem 0;
  padding: 0.7rem 1rem;
  cursor: pointer;
}
pre {
  background: #111;
  color: #eee;
  padding: 1rem;
  border-radius: 12px;
  overflow: auto;
  min-height: 180px;
}
code {
  background: #f3f3f3;
  padding: 0.15rem 0.35rem;
  border-radius: 6px;
}
.muted {
  color: #555;
}