/* Small marks at the page edge; labels appear only when someone explores them. */
.nexus-section-rail{position:fixed;z-index:35;right:4px;top:50%;transform:translateY(-50%);display:grid;gap:2px}
.nexus-section-rail a{position:relative;display:flex;align-items:center;justify-content:center;width:32px;height:clamp(20px,3.4vh,32px);color:var(--muted);text-decoration:none;border-radius:3px}
.nexus-section-rail a::after{content:'';width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.42;transition:width .18s,height .18s,opacity .18s}
.nexus-section-rail a[aria-current]::after{width:18px;height:3px;border-radius:1px;opacity:1;background:var(--accent)}
.nexus-section-rail a:hover::after,.nexus-section-rail a:focus-visible::after{opacity:1;background:var(--accent)}
.nexus-section-rail a:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.nexus-section-rail span{position:absolute;right:38px;top:50%;transform:translate(4px,-50%);padding:3px 7px;background:var(--bg);color:var(--ink);font-size:12px;font-weight:500;line-height:1.5;white-space:nowrap;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .16s,transform .16s}
.nexus-section-rail a:hover span,.nexus-section-rail a:focus-visible span{opacity:1;visibility:visible;transform:translate(0,-50%)}
.nexus-mobile-shortcuts{display:none}
body:has(dialog[open]) .nexus-section-rail{visibility:hidden}
@media(max-width:760px){
 .nexus-section-rail{display:none}
 .nav-shell #main-nav.is-open{grid-template-columns:repeat(2,minmax(0,1fr));max-height:calc(100dvh - 110px);overflow-y:auto;overscroll-behavior-y:auto}
 .nav-shell #main-nav a{min-height:44px;padding:10px 12px;display:flex;align-items:center;font-size:13px}
 .nexus-mobile-shortcuts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-column:1/-1;margin-top:8px;padding-top:12px;border-top:1px solid var(--line)}
 .nexus-mobile-shortcuts>span{grid-column:1/-1;font-size:10px;letter-spacing:.1em;color:var(--muted);padding:0 12px 6px}
 .nav-shell #main-nav a[aria-current]{color:var(--accent);font-weight:650}
 .nav-shell #main-nav a:focus-visible{outline:2px solid var(--accent);outline-offset:-2px;border-radius:4px}
}
@media(prefers-reduced-motion:reduce){.nexus-section-rail a::after,.nexus-section-rail span{transition:none}}