/* 在线抠图 */
/* 原图 / 抠图后并排看的台面：透明格子底衬在图片后面，透明 PNG 也看得出边界 */
.ct-stage{display:flex;align-items:center;justify-content:center;min-height:10rem;padding:.75rem;
  border:1px solid #eef1f5;border-radius:.6rem;
  background:linear-gradient(45deg,#f1f3f5 25%,transparent 25%,transparent 75%,#f1f3f5 75%),
             linear-gradient(45deg,#f1f3f5 25%,#fff 25%,#fff 75%,#f1f3f5 75%);
  background-size:16px 16px;background-position:0 0,8px 8px}
.ct-stage img{display:block;max-width:100%;max-height:22rem;border-radius:.375rem}
/* 「高级选项」折叠区：默认收起，点一下展开两个排查用的开关 */
.ct-adv summary{cursor:pointer;color:#6c757d;font-size:.875rem}
.ct-adv summary:hover{color:var(--site-primary)}
.ct-adv[open] summary{margin-bottom:.25rem}
.ct-adv .form-check-label{font-size:.875rem;color:#6c757d}
@media (max-width:575.98px){
  .ct-stage{min-height:8rem}
  .ct-stage img{max-height:16rem}
}