/* 图片显示优化：独占一段的图片按块级居中，限制高度，避免竖版长图刷屏 */
.post-content p > img:only-child,
.post-content li > p > img:only-child {
  display: block;
  width: auto;
  max-width: 100%;
  max-height: 460px;
  margin: 1.2em auto;
  border-radius: 6px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
  background: #f7f7f7;
}

/* 列表项里的图片跟随缩进，不要顶到最左边 */
.post-content li > p > img:only-child {
  margin-left: 0;
}

/* 点击放大（靠浏览器原生行为兜底时至少给个手势提示） */
.post-content p > img:only-child {
  cursor: zoom-in;
}

/* lightbox */
.img-lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.85);
  cursor: zoom-out;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.img-lightbox.active { display: flex; }
.img-lightbox img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 4px;
}