.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1rem;
  margin: 1rem 0 1.5rem 0;
}
.course-card {
  border: 1px solid #d6d6d6;
  border-radius: 10px;
  padding: 1rem;
  background: #fafafa;
}
.assistant-box {
  border: 1px solid #cfcfcf;
  border-radius: 12px;
  padding: 1rem;
  background: #f8f8f8;
  margin: 1rem 0;
}
.assistant-box textarea {
  width: 100%;
  box-sizing: border-box;
  margin: 0.5rem 0;
  padding: 0.75rem;
  border: 1px solid #bbb;
  border-radius: 8px;
  font-family: inherit;
}
.assistant-box button {
  padding: 0.55rem 1rem;
  border-radius: 8px;
  border: 1px solid #333;
  background: #222;
  color: white;
  cursor: pointer;
}
.assistant-answer {
  margin-top: 1rem;
  padding: 1rem;
  border-left: 4px solid #444;
  background: white;
}