/* 以页面内的自定义进度轨替代浏览器原生滚动条，避免其占用布局宽度。 */
html{scrollbar-width:none;-ms-overflow-style:none}
html::-webkit-scrollbar,body::-webkit-scrollbar{width:0;height:0;display:none}

.bc-scroll-indicator{position:fixed;top:96px;right:8px;bottom:18px;z-index:90;width:3px;
  overflow:hidden;background:rgba(255,255,255,.1);pointer-events:none;opacity:.52;
  transition:opacity .2s ease}
.bc-scroll-indicator.is-scrolling{opacity:1}
.bc-scroll-indicator__thumb{position:absolute;top:0;right:0;width:100%;min-height:28px;
  background:var(--gold,#fde533);transform:translate3d(0,0,0);will-change:transform,height}
@media(max-width:900px){.bc-scroll-indicator{top:88px;right:5px;bottom:12px;width:2px}.bc-scroll-indicator__thumb{min-height:22px}}
@media(prefers-reduced-motion:reduce){.bc-scroll-indicator{transition:none}.bc-scroll-indicator__thumb{will-change:auto}}