/* Keep the original header space; reveal the same header when scrolling up. */
.header-scroll-enabled .site-header{position:sticky;top:0;z-index:40;background:var(--paper);isolation:isolate;transform:translateY(0);transition:transform .24s ease,visibility .24s;will-change:transform}
.header-scroll-enabled .site-header::before{content:"";position:absolute;top:0;bottom:-1px;left:calc((100vw - 100%) / -2);right:calc((100vw - 100%) / -2);background:var(--paper);border-bottom:1px solid var(--line);z-index:-1}
.header-scroll-enabled .site-header.header-scroll-initial{transform:translateY(calc(-1 * var(--header-scroll-y,0px)));transition:none}
.header-scroll-enabled .site-header.header-scroll-hidden{transform:translateY(-100%);visibility:hidden;pointer-events:none}
.header-scroll-enabled #search-panel{position:fixed;top:var(--site-header-height,112px);left:50%;transform:translateX(-50%);z-index:39;margin:0;background:var(--paper);padding:16px 0;border-bottom:1px solid var(--line)}
@media(prefers-reduced-motion:reduce){.header-scroll-enabled .site-header{transition:none}}