.topic-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  margin-bottom: 12px;
  border-radius: 12px;
  background: rgba(255,255,255,0.2);
  color: #fff;
  font-weight: 800;
  font-size: 13px;
}

.run-btn {
  background: linear-gradient(135deg, #3776ab, #0f4c81);
  box-shadow: 0 4px 14px rgba(55, 118, 171, 0.3);
}

pre.output {
  color: #9fffb0;
}