.chapter-rail{--rail-step:26px;left:var(--rail-x,var(--grid-margin,24px));top:var(--rail-y,22dvh);z-index:var(--layer-chrome);color:var(--rail-color,currentColor);transition:color var(--dur-ui) var(--ease-out);position:fixed}.chapter-rail__ticks{margin:0;padding:0;list-style:none;display:grid}.chapter-rail__tick{width:44px;height:var(--rail-step);color:inherit;align-items:center;margin-left:-10px;padding-left:10px;display:flex}.chapter-rail__tick:before{content:"";opacity:.55;transform-origin:0;width:8px;height:1px;transition:transform .45s var(--ease-out), opacity var(--dur-ui) var(--ease-out);background:currentColor}.chapter-rail__tick[aria-current=true]:before{opacity:1;transform:scaleX(2.75)}.chapter-rail__tick:focus-visible{outline-offset:-2px;outline:2px solid}@media (hover:hover) and (pointer:fine){.chapter-rail__tick:hover:before{opacity:1;transform:scaleX(1.75)}}.chapter-rail__current{height:var(--rail-step);white-space:nowrap;translate:0 calc(var(--rail-index,0) * var(--rail-step));transition:translate .52s var(--ease-out-expo);align-items:center;margin:0;display:flex;position:absolute;top:0;left:34px;overflow:hidden}.chapter-rail__name{display:block}.chapter-rail__count{margin:14px 0 0}@media (prefers-reduced-motion:reduce){.chapter-rail__current,.chapter-rail__tick:before{transition:none}}@media (max-width:719px){.chapter-rail{top:var(--rail-mobile-top,auto);bottom:var(--rail-mobile-bottom,18px);left:var(--grid-margin,16px);align-items:baseline;gap:10px;display:flex}.chapter-rail__ticks{display:none}.chapter-rail__current{height:auto;position:static;translate:none}.chapter-rail__count{margin:0}}.hairline-grid{z-index:var(--layer-chrome);pointer-events:none;color:var(--hairline-color,currentColor);contain:strict;transition:color var(--dur-ui) var(--ease-out);position:fixed;inset:0}.hairline-grid--absolute{position:absolute}.hairline-grid.is-hidden{visibility:hidden}.hairline-grid__v,.hairline-grid__h{opacity:var(--hairline-opacity,.4);background:currentColor;position:absolute}.hairline-grid__v{width:1px;top:0;bottom:0}.hairline-grid__h{height:1px;left:0;right:0}.hairline-grid__marker{width:var(--marker-size,11px);height:var(--marker-size,11px);position:absolute;translate:-50% -50%}.hairline-grid__marker--star{clip-path:polygon(50% 0,58% 42%,100% 50%,58% 58%,50% 100%,42% 58%,0 50%,42% 42%);background:currentColor}.hairline-grid__marker--cross:before,.hairline-grid__marker--cross:after{content:"";background:currentColor;position:absolute}.hairline-grid__marker--cross:before{height:1px;top:calc(50% - .5px);left:0;right:0}.hairline-grid__marker--cross:after{width:1px;top:0;bottom:0;left:calc(50% - .5px)}@media (max-width:719px){.hairline-grid{--marker-size:9px}}