.doc-spine{--spine-measure:var(--measure,min(640px,100%));--spine-gap:32px;position:absolute;top:0;bottom:0;left:calc(50% - var(--spine-measure) / 2 - var(--spine-gap));width:1px;background:rgba(33,29,25,.16);pointer-events:none}.doc-spine--box{--spine-measure:min(900px,100%)}.air :is(.mdx-col,.faq):has(>.doc-spine){position:relative}.doc-spine-ink{position:absolute;top:0;left:0;width:100%;height:0;background:var(--ink-deep);opacity:0}.doc-spine[data-live="1"] .doc-spine-ink{opacity:1}.doc-spine-station{position:absolute;left:-2px;display:block;width:5px;height:5px;border-radius:2px;background:var(--ink-deep)}@media (max-width:899px){.doc-spine{display:none}}@media (max-width:1099px){.doc-spine--box{display:none}}@media (prefers-reduced-motion:reduce){.doc-spine-ink{height:100%;opacity:1}}