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/* Section controls: explicit jumping for pointer, touch and keyboard users. */
.chapter-nav{position:fixed;right:22px;bottom:20px;z-index:15;display:flex;align-items:center;gap:0;background:#121016f5;border:1px solid #51435f;border-radius:4px;box-shadow:0 6px 28px #0006;backdrop-filter:blur(12px)}.chapter-nav button{width:46px;height:46px;background:transparent;color:var(--text);border:0;font-size:20px;cursor:pointer}.chapter-nav button:hover:not(:disabled){background:#352942;color:var(--accent)}.chapter-nav button:disabled{opacity:.3;cursor:default}.chapter-nav button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.chapter-nav>span{font:11px Consolas,monospace;letter-spacing:1px;color:var(--muted);padding-inline:10px}.footer{padding-bottom:95px}
@media(max-width:700px){.chapter-nav{right:12px;bottom:12px}.chapter-nav button{width:44px;height:44px}.chapter-nav>span{font-size:10px;padding-inline:7px}.footer{padding-bottom:90px}}

/* Named section rail, with a compact mobile section picker. */
.section-rail{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:12;width:148px;display:flex;flex-direction:column;gap:2px;padding:18px 10px;background:#0c0b10e8;border:1px solid #302a3c;border-radius:6px;backdrop-filter:blur(16px)}.rail-heading{font:9px Consolas,monospace;letter-spacing:1.8px;color:var(--muted);padding:0 10px 14px}.section-rail a{min-height:44px;display:flex;align-items:center;gap:11px;padding:8px 9px;color:#aaa5b7;font-size:12px;line-height:1.4;border-left:2px solid transparent;transition:background .25s,color .25s,border-color .25s}.section-rail a>span:first-child{font:10px Consolas,monospace;color:#887d99}.section-rail a:hover{background:#231c30;color:#eee7fa}.section-rail a[aria-current]{border-left-color:var(--accent);background:#211a2d;color:#f2eafa}.section-rail a[aria-current]>span:first-child{color:var(--accent)}.chapter-nav .section-toggle{width:auto;min-width:130px;padding:0 14px;font:12px Arial,sans-serif;display:none}.section-rail a:focus-visible{outline-offset:-3px}
@media(min-width:1200px){main .wrap,.footer.wrap{width:calc(100% - 270px);max-width:1250px;margin-left:max(44px,calc((100vw - 1510px)/2));margin-right:auto}.header.wrap{width:calc(100% - 88px)}.chapter-nav{right:18px;width:148px;justify-content:space-between}.chapter-nav>span{padding-inline:0}.hero-content{padding-top:45px}}
@media(max-width:1199px){.section-rail{display:none;top:auto;bottom:82px;right:18px;transform:none;width:240px;max-height:calc(100dvh - 210px);overflow-y:auto;padding:18px 12px;box-shadow:0 12px 60px #0009}.section-rail.is-open{display:flex}.section-rail a{font-size:14px;gap:18px;min-height:46px}.rail-heading{font-size:10px}.chapter-nav .section-toggle{display:block}.chapter-nav>span{display:none}.chapter-nav{right:18px}.chapter-nav .section-toggle[aria-expanded=true]{background:#30223f;color:#e0ccff}}
@media(max-width:700px){.section-rail{right:12px;bottom:72px;max-height:calc(100dvh - 190px)}.chapter-nav{right:12px}.chapter-nav .section-toggle{min-width:140px}.contact-context{padding-bottom:15px}}
@media(prefers-reduced-motion:reduce){.section-rail a{transition:none}}

/* Floating right-hand section index: quiet labels and illuminated markers. */
@media(min-width:0px){
 .section-rail,.section-rail.is-open{display:flex;top:50%;bottom:auto;transform:translateY(-50%);max-height:calc(100dvh - 160px);overflow:visible}
 .section-rail{right:24px;width:150px;padding:12px 0;background:transparent;border:0;border-radius:0;box-shadow:none;backdrop-filter:none;gap:5px;isolation:isolate}
 .section-rail:before{content:'';position:absolute;inset:-18px -20px;z-index:-1;background:radial-gradient(ellipse,#090a0de8 25%,#090a0d99 55%,transparent 75%);pointer-events:none}
 .section-rail .rail-heading{display:none}
 .section-rail a{position:relative;justify-content:flex-end;flex-direction:row-reverse;gap:16px;min-height:44px;padding:8px 0;border:0;color:#96909f;font-size:11px;letter-spacing:.3px;background:transparent;border-radius:0;transition:color .3s,transform .3s}
 .section-rail a>span:first-child{font-size:0;display:block;flex:0 0 5px;width:5px;height:5px;border:1px solid #84758f;border-radius:50%;position:relative;transition:background .3s,border-color .3s,box-shadow .3s}
 .section-rail a:not(:last-child)>span:first-child:after{content:'';position:absolute;top:12px;left:1px;width:1px;height:28px;background:#51455e70}
 .section-rail a:hover{background:transparent;color:#eee6fb;transform:translateX(-3px)}
 .section-rail a[aria-current]{border:0;background:transparent;color:#e2cdff}
 .section-rail a[aria-current]>span:first-child{background:#d2adff;border-color:#d2adff;box-shadow:0 0 0 4px #b790f519,0 0 15px #c39aff99}
 .section-rail a[aria-current]>span:last-child{text-shadow:0 0 20px #b38ae74d}
 .section-rail a:focus-visible{outline-offset:4px;border-radius:3px}
 .chapter-nav{display:none}
}
@media(max-width:1199px){
 .section-rail{right:12px;width:125px;pointer-events:none;gap:0}
 .section-rail:before{display:none}
 .section-rail a{pointer-events:auto;min-height:44px;gap:12px;font-size:10px;width:44px;margin-left:auto;overflow:visible}
 .section-rail a>span:last-child{position:absolute;right:24px;white-space:nowrap;opacity:0;transform:translateX(5px);padding:3px 7px;background:#0b0a10eb;border-radius:3px;transition:opacity .25s,transform .25s;pointer-events:none}
 .section-rail a[aria-current]>span:last-child,.section-rail a:hover>span:last-child,.section-rail a:focus-visible>span:last-child{opacity:1;transform:translateX(0)}
 .section-rail a:not(:last-child)>span:first-child:after{height:23px}
 .section-rail a:hover{transform:none}
}
@media(prefers-reduced-motion:reduce){.section-rail a,.section-rail a>span:first-child{transition:none}}
.section-rail a[aria-current]:after{display:none}