.chapter-progress-bar{width:100%;height:2px;z-index:calc(var(--z-navbar) + 1);background:0 0;position:fixed;top:0;left:0}.chapter-progress-fill{background:var(--accent-gold);height:100%;transition:width .4s var(--ease-out)}.chapter-rail{display:none}@media (min-width:993px){.chapter-progress-bar{display:none}.chapter-rail{--rail-content-edge:calc(max(0px, (100vw - 1400px) / 2) + clamp(1.25rem, .5rem + 3vw, 4rem));--rail-left:clamp(.5rem, calc(var(--rail-content-edge) - 2rem), 2rem);left:var(--rail-left);z-index:var(--z-navbar);display:block;position:fixed;top:50%;transform:translateY(-50%)}.chapter-rail ol{flex-direction:column;gap:1rem;list-style:none;display:flex}.chapter-rail a{font-family:var(--font-heading);font-size:var(--step--1);letter-spacing:1px;color:var(--text-muted);opacity:.4;transition:opacity .3s var(--ease-out), color .3s var(--ease-out);align-items:center;gap:.75rem;min-height:0;font-weight:800;display:flex}.chapter-rail li.active a{opacity:1;color:var(--accent-gold)}.chapter-rail .rail-label{--rail-available:calc(var(--rail-content-edge) - var(--rail-left) - 2.5rem);white-space:nowrap;text-overflow:ellipsis;max-width:0;transition:max-width .4s var(--ease-out);overflow:hidden}}@media (min-width:1700px){.chapter-rail li.active .rail-label,.chapter-rail a:hover .rail-label,.chapter-rail a:focus-visible .rail-label{max-width:min(var(--rail-available), 14rem)}}
.chapter{padding-block:var(--space-section);scroll-margin-top:6rem}.chapter-badge{font-family:var(--font-heading);font-size:var(--step--1);letter-spacing:2px;text-transform:uppercase;color:var(--accent-gold);margin-bottom:var(--space-item);flex-wrap:wrap;align-items:center;gap:.5rem;font-weight:800;display:flex}.chapter-badge-sep{opacity:.5}.chapter-title{font-size:var(--step-5);letter-spacing:-2px;margin-bottom:var(--space-block);max-width:20ch;font-weight:900;line-height:.95}