main {
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  flex-wrap: wrap;
  gap: 20px;
}

.tool {
  width: 880px;
}

.ad-right {
  width: 300px;
  position: sticky;
  top: 0;
  align-self: flex-start;
  margin-top: 30px;
}

/* 移动端适配：屏幕宽度小于等于768px时，改为纵向布局 */
@media (max-width: 768px) {
  main {
    flex-direction: column;
  }

  .tool,
  .ad-right {
    width: 100%;
  }
  .ad-right {
    position: static;
  }
}