.teach {
  margin-top: var(--s-3);
  border: 1px solid var(--hairline);
  border-radius: var(--r-control);
  background: var(--panel);
}
.teach > summary {
  cursor: pointer;
  padding: 10px 14px;
  color: var(--text-dim);
  font-size: 0.9rem;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.teach > summary::-webkit-details-marker {
  display: none;
}
.teach > summary::before {
  content: '?';
  display: inline-grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  flex: none;
}
.teach[open] > summary {
  color: var(--text);
}
.teach__body {
  padding: 0 14px 14px 40px;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.6;
}
.teach__body strong {
  color: var(--text);
  font-weight: 600;
}