body {
  font-family: system-ui, sans-serif;
  background: #f8fafc;
  margin: 0;
  padding: 0;
}
.container {
  max-width: 500px;
  margin: 40px auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
  padding: 2rem 2.5rem 2.5rem 2.5rem;
}
h1 {
  text-align: center;
  margin-bottom: 1.5rem;
}
#setup, #practice, #done {
  margin-top: 1.5rem;
}
label {
  display: block;
  margin-bottom: 0.5rem;
}
input[type="number"], input[type="text"] {
  width: 100%;
  padding: 0.5rem;
  margin-bottom: 1rem;
  font-size: 1rem;
  border: 1px solid #d1d5db;
  border-radius: 4px;
  box-sizing: border-box;
}
button {
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 0.5rem 1.2rem;
  font-size: 1rem;
  cursor: pointer;
  margin-bottom: 1rem;
}
button:hover {
  background: #1d4ed8;
}
#command-prompt {
  font-family: monospace;
  background: #f1f5f9;
  padding: 0.7rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  font-size: 1.05rem;
}
#feedback {
  font-size: 1.1rem;
  margin-top: 0.5rem;
  min-height: 1.5em;
}
#done h2 {
  text-align: center;
  color: #16a34a;
}