.bz-chapter-rail{position:fixed;left:clamp(20px, 1.6vw, 36px);top:50%;z-index:50;transform:translateY(-50%) rotate(180deg);writing-mode:vertical-rl;font-family:var(--font-d);font-size:12px;font-weight:600;letter-spacing:.4em;text-transform:uppercase;color:var(--bz-or,#B89D64);pointer-events:none;opacity:0;transition:opacity 360ms cubic-bezier(.3,0,0,1)}.bz-chapter-rail.is-visible{opacity:1}body.bz-prevhub .bz-chapter-rail{color:var(--ph-amber,#C4821A)}@media (max-width:960px){.bz-chapter-rail{display:none}}