.arc-rail{--arc-rail-toggle:34px;--arc-rail-card-w:clamp(240px, 76vw, 300px);--arc-rail-card-h:260px;--arc-rail-word-step:18ms;--arc-rail-lead:90ms;overscroll-behavior-inline:contain;scrollbar-width:none;touch-action:pan-y;overflow-x:auto}.arc-rail::-webkit-scrollbar{display:none}.arc-rail__track{gap:var(--space-md);padding-inline:max(var(--page-margin), (100% - var(--width-max)) / 2);padding-block:var(--space-2xs);align-items:stretch;margin:0;list-style:none;display:flex}.arc-rail__item{inline-size:var(--arc-rail-card-w);flex:none}.arc-rail__card{--rail-bg:var(--surface-raised);--rail-title:var(--text-strong);--rail-body:var(--text-body);--rail-line:var(--line-strong);--rail-border:var(--line);block-size:100%;min-block-size:var(--arc-rail-card-h);padding:var(--space-md);border:1px solid var(--rail-border);border-radius:var(--radius-card);background:var(--rail-bg);box-shadow:none;transition:background-color var(--dur-fast) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard), box-shadow var(--dur-base) var(--ease-standard), color var(--dur-fast) var(--ease-standard);position:relative}@media (hover:hover) and (pointer:fine){.arc-rail__card:hover{--rail-bg:var(--surface-light);--rail-title:var(--text-inverse-strong);--rail-body:var(--text-inverse-body);--rail-line:var(--line-on-light-strong);--rail-border:var(--line-gold);box-shadow:var(--shadow-glow-gold)}}.arc-rail__card[data-expanded=true],.arc-rail__card:focus-within{--rail-bg:var(--surface-light);--rail-title:var(--text-inverse-strong);--rail-body:var(--text-inverse-body);--rail-line:var(--line-on-light-strong);--rail-border:var(--line-gold);box-shadow:var(--shadow-glow-gold)}.arc-rail__layer{inset:var(--space-md);flex-direction:column;margin:0;display:flex;position:absolute}.arc-rail__browse{justify-content:space-between}.arc-rail__reveal{visibility:hidden;transition:visibility 0s linear var(--dur-base);justify-content:flex-start;padding-block-end:calc(var(--arc-rail-toggle) - var(--space-2xs))}.arc-rail__card[data-expanded=true] .arc-rail__reveal{visibility:visible;transition-delay:0s}.arc-rail__icon{color:var(--rail-title);transition:opacity var(--dur-base) var(--ease-water), transform var(--dur-base) var(--ease-water), color var(--dur-fast) var(--ease-standard);flex:none;display:inline-flex}.arc-rail__card[data-expanded=true] .arc-rail__icon{opacity:0;transform:translateY(-8px)}.arc-rail__title{font-family:var(--font-sans);font-weight:var(--fw-medium);font-size:var(--fs-body);line-height:var(--lh-snug);color:var(--rail-title);transition:color var(--dur-fast) var(--ease-standard);margin:0;padding-inline-end:calc(var(--arc-rail-toggle) + var(--space-2xs))}.arc-rail__body{font-family:var(--font-sans);font-size:var(--fs-body-sm);line-height:var(--lh-relaxed);color:var(--rail-body);transition:color var(--dur-fast) var(--ease-standard);margin:0}.arc-rail__word{transition:opacity var(--dur-base) var(--ease-water), transform var(--dur-base) var(--ease-water);display:inline-block}.arc-rail__word+.arc-rail__word{margin-inline-start:.26em}.arc-rail__browse .arc-rail__word{opacity:1;transition-delay:calc(var(--i) * var(--arc-rail-word-step));transform:none}.arc-rail__card[data-expanded=true] .arc-rail__browse .arc-rail__word{opacity:0;transform:translateY(-4px)}.arc-rail__reveal .arc-rail__word{opacity:0;transition-delay:0s;transform:translateY(5px)}.arc-rail__card[data-expanded=true] .arc-rail__reveal .arc-rail__word{opacity:1;transition-delay:calc(var(--arc-rail-lead) + var(--i) * var(--arc-rail-word-step));transform:none}.arc-rail__toggle{inline-size:var(--arc-rail-toggle);block-size:var(--arc-rail-toggle);border:1px solid var(--rail-line);border-radius:var(--radius-pill);color:var(--rail-title);cursor:pointer;transition:transform var(--dur-base) var(--ease-standard), border-color var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard);background:0 0;justify-content:center;align-items:center;padding:0;display:inline-flex;position:absolute;inset-block-end:var(--space-md);inset-inline-end:var(--space-md)}.arc-rail__card[data-expanded=true] .arc-rail__toggle{transform:rotate(180deg)}.arc-rail-shell{position:relative}.arc-rail__nav{justify-content:flex-end;gap:var(--space-xs);width:100%;max-width:var(--width-max);padding-inline:var(--page-margin);margin-block-end:var(--space-sm);margin-inline:auto;display:flex}.arc-rail__arrow{border-radius:var(--radius-circle);border:1px solid var(--line);background:var(--surface-raised);width:44px;height:44px;color:var(--text-strong);cursor:pointer;transition:border-color var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard), background var(--dur-fast) var(--ease-standard);justify-content:center;align-items:center;display:inline-flex}.arc-rail__arrow:hover,.arc-rail__arrow:focus-visible{border-color:var(--accent);color:var(--accent)}