/* Optional reading layers; approved theme, snowfall and hero remain unchanged. */
.nav__links a[aria-current="location"],#mobileNav a[aria-current="location"]{color:var(--gold);text-decoration:underline;text-underline-offset:7px;text-decoration-thickness:1px}
.service-choice{border-top:1px solid var(--line);scroll-margin-top:90px}
.service-choice:last-child{border-bottom:1px solid var(--line)}
.service-choice>summary{display:flex;align-items:center;justify-content:space-between;gap:25px;list-style:none;padding:31px 0;cursor:pointer}
.service-choice summary::-webkit-details-marker,.service-deep summary::-webkit-details-marker,.domain-advanced summary::-webkit-details-marker,.case-details summary::-webkit-details-marker{display:none}
.service-choice>summary>span:first-child{display:grid;gap:7px}
.service-choice>summary small{font-size:9px;color:var(--muted2);letter-spacing:.1em}
.service-choice>summary strong{font-size:clamp(22px,2.8vw,33px);font-weight:500;line-height:1.6;letter-spacing:-.035em}
.service-choice>summary>span:first-child>span{font-size:12px;color:var(--muted);line-height:1.9}
.service-choice-open{display:flex;gap:22px;align-items:center;white-space:nowrap;color:var(--gold);font-size:11px}
.service-choice-open i{font-size:22px;font-style:normal;font-weight:300;display:inline-block}
.service-choice[open]>.business-hub{border:0;padding-top:7px;padding-bottom:38px}
.service-choice[open]>summary .service-choice-open i{transform:rotate(45deg)}
.service-deep,.domain-advanced,.case-details{border-top:1px solid var(--line)}
.service-deep>summary,.domain-advanced>summary,.case-details>summary{display:flex;align-items:center;justify-content:space-between;gap:20px;list-style:none;cursor:pointer;font-size:12px;line-height:1.9;padding:17px 0;color:var(--muted)}
.domain-advanced>summary{padding:17px}
.service-deep[open]>summary,.domain-advanced[open]>summary,.case-details[open]>summary{color:var(--gold)}
.service-deep[open]>summary>span:last-child,.domain-advanced[open]>summary>span:last-child,.case-details[open]>summary>span:last-child{transform:rotate(45deg)}
.service-deep .business-deliverables{margin-top:12px}
.service-demo{position:relative;top:auto;box-shadow:none}
.domain-primer{padding:23px 20px;min-width:0}
.domain-primer>p,.software-primer>p{font-size:16px;line-height:1.9;font-weight:400;max-width:540px}
.software-primer svg{display:block;width:100%;height:auto;margin:30px 0 22px;overflow:visible}
.software-primer svg path{fill:none;stroke:var(--muted);stroke-width:1.4}
.software-primer svg .primer-route{stroke:var(--line);stroke-dasharray:3 5}
.software-primer svg rect{fill:var(--bg);stroke:var(--line);stroke-width:1}
.software-primer svg text{fill:var(--muted);font-size:14px;font-family:inherit}
.software-primer svg [data-primer-token]{fill:var(--gold)}
.software-primer svg [data-active="true"] rect{stroke:var(--gold)}
.software-primer svg [data-active="true"] text{fill:var(--gold)}
.software-primer small{display:block;font-size:10px;color:var(--muted2);line-height:1.9}
#projectShowcase .case-origin{font-size:10px}
#projectShowcase .case-details{margin-top:18px}
#projectShowcase .case-details>summary{padding:19px 0}
#projectShowcase .case-details .case-application{margin-top:0}
#projectShowcase [data-case-interface]{min-width:0}
summary:focus-visible{outline:2px solid var(--gold);outline-offset:5px}
/* Discrete chapter position: seven stops, independent of chapter length. */
html{--rail-safe-right:env(safe-area-inset-right,0px)}
#pageRail{position:fixed;right:max(4px,var(--rail-safe-right));top:80px;bottom:56px;margin-block:auto;width:64px;height:calc(34px + var(--rail-step)*9);z-index:90;color:var(--muted);font-size:10px;--rail-progress:0;--rail-step:clamp(24px,calc((100svh - 170px)/9),44px)}
#pageRail[hidden],#pageRail [hidden]{display:none!important}
#pageRail [data-rail-status]{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;gap:2px;height:34px;margin:0;text-align:center;line-height:1.4}
#pageRail [data-rail-current]{color:var(--ink);font-size:9px;white-space:nowrap}
#pageRail [data-rail-index]{color:var(--muted2);font-size:9px;font-variant-numeric:tabular-nums;white-space:nowrap}
#pageRail [data-rail-panel]{position:relative;display:flex;flex-direction:column;align-items:center}
#pageRail .rail-chapters{position:relative}
#pageRail ol{list-style:none;margin:0;padding:0;width:44px}
#pageRail li{margin:0;padding:0}
#pageRail a{position:relative;display:flex;align-items:center;justify-content:center;width:44px;height:var(--rail-step);min-height:24px;text-decoration:none;color:var(--muted);border-radius:3px}
#pageRail a:hover,#pageRail a[aria-current="location"]{color:var(--gold)}
#pageRail a:focus-visible{outline:2px solid var(--gold);outline-offset:1px}
#pageRail [data-rail-jump]{font-size:17px;background:var(--bg)}
#pageRail [data-rail-chapter] i{width:6px;height:6px;box-sizing:border-box;border:1px solid var(--muted2);border-radius:50%;background:var(--bg);z-index:1}
#pageRail [data-rail-chapter][aria-current="location"] i{border-color:var(--gold);background:var(--gold);box-shadow:0 0 0 3px #ffcc6618}
#pageRail .rail-label{position:absolute;right:calc(100% + 5px);padding:6px 9px;background:#1f2430f5;border:1px solid var(--line);border-radius:3px;white-space:nowrap;opacity:0;visibility:hidden;pointer-events:none;color:var(--ink);line-height:1.6}
#pageRail a:hover .rail-label,#pageRail a:focus-visible .rail-label{opacity:1;visibility:visible}
#pageRail [data-rail-progress]{position:absolute;top:calc(var(--rail-step)/2);left:calc(50% - .5px);width:1px;height:calc(var(--rail-step)*6);background:var(--line);pointer-events:none}
#pageRail [data-rail-progress]::after{content:"";position:absolute;inset:0;background:var(--gold);transform:scaleY(var(--rail-progress));transform-origin:top}
/* Reserve the reading gutter without changing the hero's canvas or scroll geometry. */
@media(max-width:1360px), (max-height:600px){
 html.js{--rail-gutter:64px}
 html.js #main{width:calc(100% - var(--rail-gutter) - var(--rail-safe-right))}
 html.js .hero__copy{max-width:calc(100% - var(--rail-gutter) - var(--rail-safe-right) - 20px)}
 html.js .field-hub{right:calc(var(--rail-gutter) + var(--rail-safe-right) + 4px)}
 html.js .hero__rail,html.js .hero__bottom{right:calc(var(--rail-gutter) + var(--rail-safe-right) + 4px)}
}
@media(max-width:760px){
 #pageRail{top:72px;--rail-step:clamp(24px,calc((100svh - 162px)/9),44px)}
 html.js .hero__copy{width:calc(88% - var(--rail-gutter) - var(--rail-safe-right))}
 html.js .hero__actions{flex-wrap:wrap;gap:12px 20px}
}
@media(max-height:600px) and (min-width:761px){html.js .hero{min-height:0}}
@media(max-width:385px) and (max-height:700px){
 html.js[lang=en] .hero__actions{font-size:10px;gap:10px;margin-top:14px}
 html.js[lang=en] .hero__actions a{display:inline-flex;align-items:center;min-height:44px}
 html.js[lang=en] .hero__primary{padding-inline:8px}
}
/* Short landscape keeps every chapter exposed in two columns. */
@media(max-height:380px){
 html.js{--rail-gutter:92px}
 #pageRail{width:88px;height:178px;--rail-step:24px}
 #pageRail ol{display:grid;grid-template-columns:repeat(2,44px);width:88px}
 #pageRail [data-rail-progress]{display:none}
}
@media(max-width:540px){.service-choice>summary{gap:14px;padding:23px 0;align-items:flex-start}.service-choice>summary strong{font-size:23px}.service-choice-open{font-size:10px;gap:9px;padding-top:24px}.service-choice-open>span{display:none}.service-choice>summary>span:first-child>span{font-size:12px}.domain-primer{padding:20px 14px}.domain-primer>p,.software-primer>p{font-size:15px}.software-primer svg{margin:25px 0}.software-primer svg text{font-size:17px}.service-choice[open]>.business-hub{padding-top:0}}