body {
  font-family: system-ui, sans-serif;
  background: #f5f5f7;
  margin: 0;
  padding: 2rem;
}
.container {
  max-width: 800px;
  margin: 0 auto;
  background: #fff;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}
h1 { margin-top: 0; }
#generate-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
#generate-form label { display: flex; flex-direction: column; font-size: 0.9rem; color: #333; }
#generate-form input, #generate-form select {
  padding: 0.5rem;
  margin-top: 0.25rem;
  border: 1px solid #ccc;
  border-radius: 6px;
}
#submit-btn {
  grid-column: span 2;
  padding: 0.7rem;
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
#submit-btn:disabled { opacity: 0.6; cursor: not-allowed; }
#status { margin: 1rem 0; font-weight: 600; }
.question-card {
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.question-card ul { padding-left: 1.2rem; }
.correct { color: #16a34a; font-weight: 600; }
.explanation { color: #555; font-size: 0.9rem; margin-top: 0.5rem; }