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.hero{position:relative;min-height:100svh;display:flex;align-items:center;isolation:isolate;overflow:hidden}.hero-media,.hero-grade{position:absolute;inset:0}.hero-media img{width:100%;height:100%;object-fit:cover;object-position:center}.hero-grade{z-index:1;background:linear-gradient(90deg,rgba(2,6,10,.93),rgba(2,6,10,.67) 46%,rgba(2,6,10,.08) 78%),linear-gradient(180deg,rgba(2,6,10,.55),transparent 35%,rgba(2,6,10,.82))}.hero-copy{position:relative;z-index:3;width:min(760px,calc(100vw - 2rem));margin-left:max(1rem,calc((100vw - 1240px)/2));padding:8rem 0 6rem}.kicker{margin:0 0 1rem;color:#ffc875;font-size:.67rem;letter-spacing:.21em;text-transform:uppercase}.si0s-mark{display:block;width:clamp(10rem,20vw,18rem);height:auto;filter:drop-shadow(0 0 1.4rem rgba(255,255,255,.2))}.descriptor{margin:.8rem 0 1.6rem;color:#e6edf3;font-size:.7rem;letter-spacing:.15em;text-transform:uppercase}.hero h1,.section-intro h2,.signal-copy h2,.gateway-copy h2{font-family:Arial,sans-serif;letter-spacing:-.06em;line-height:.91}.hero h1{max-width:10ch;margin:0;font-size:clamp(3.5rem,6.9vw,7.4rem)}.lead{max-width:62ch;color:#d0d8df;font-family:Arial,sans-serif;font-size:clamp(1rem,1.35vw,1.2rem);line-height:1.65}.actions{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.7rem}.actions a{min-height:3.15rem;padding:.8rem 1.15rem;border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;text-decoration:none;font-size:.68rem;letter-spacing:.08em}.actions .primary{border-color:rgba(247,147,26,.65);background:linear-gradient(115deg,#ef7900,#e1b45e);color:#050607}.actions .secondary{background:rgba(3,7,11,.3);backdrop-filter:blur(8px)}.disclosure{max-width:68ch;margin-top:1.2rem;color:#929ea9;font-size:.65rem;line-height:1.65}.disclosure span{margin-right:.5rem;color:var(--blue);text-transform:uppercase;letter-spacing:.08em}.chapter-cue{position:absolute;z-index:3;right:max(1rem,calc((100vw - 1240px)/2));bottom:max(1.4rem,env(safe-area-inset-bottom));display:flex;align-items:center;gap:.75rem;text-decoration:none;color:#d7dfe6;font-size:.63rem;letter-spacing:.11em;text-transform:uppercase}.chapter-cue span{color:var(--orange)}.flow-field{position:absolute;inset:0;z-index:2;pointer-events:none}.flow-field::before{content:"";position:absolute;inset:45% 5% 4%;border:1px solid rgba(115,216,255,.13);border-radius:50%;transform:perspective(750px) rotateX(65deg);box-shadow:0 0 5rem rgba(115,216,255,.08)}.flow-field i{position:absolute;width:.35rem;aspect-ratio:1;border-radius:50%;background:#fff;box-shadow:0 0 .5rem .2rem rgba(115,216,255,.6);animation:pulse 3.8s ease-in-out infinite}.flow-field i:nth-child(1){left:24%;top:67%}.flow-field i:nth-child(2){left:42%;top:57%;animation-delay:.7s}.flow-field i:nth-child(3){left:61%;top:65%;animation-delay:1.4s}.flow-field i:nth-child(4){left:76%;top:48%;animation-delay:2.1s}.flow-field i:nth-child(5){left:88%;top:70%;animation-delay:2.8s}
.relationship{width:min(1240px,calc(100vw - 2rem));margin:auto;padding:clamp(6rem,11vw,10rem) 0}.section-intro{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(2rem,6vw,7rem);align-items:end}.section-intro .kicker{grid-column:1/-1;margin:0}.section-intro h2{max-width:13ch;margin:0;font-size:clamp(3rem,6vw,6.6rem)}.section-intro>p:last-child{max-width:58ch;margin:0;color:var(--muted);font-family:Arial,sans-serif;line-height:1.75}.continuum{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:clamp(4rem,8vw,7rem);background:var(--line)}.continuum::before{content:"";position:absolute;left:12%;right:12%;top:5.2rem;height:1px;background:linear-gradient(90deg,var(--orange),var(--blue),var(--orange));filter:drop-shadow(0 0 .5rem var(--blue))}.continuum article{position:relative;min-height:300px;padding:1.25rem;background:linear-gradient(160deg,#081019,#04080d)}.continuum article>span{color:#7e8a96;font-size:.6rem}.node{position:relative;width:2rem;aspect-ratio:1;margin:2.6rem 0 2.2rem;border:1px solid rgba(115,216,255,.5);border-radius:50%;display:grid;place-items:center;background:#071019;box-shadow:0 0 1.6rem rgba(115,216,255,.16)}.node i{width:.35rem;aspect-ratio:1;border-radius:50%;background:#fff;box-shadow:0 0 .7rem var(--blue)}.continuum article:nth-child(4) .node{border-color:rgba(247,147,26,.7)}.continuum h3{margin:0;font-family:Arial,sans-serif;font-size:clamp(1.5rem,2.5vw,2.4rem);font-weight:500}.continuum p{color:#939faa;font-family:Arial,sans-serif;font-size:.9rem;line-height:1.6}
.signal{width:min(1240px,calc(100vw - 2rem));min-height:760px;margin:auto;padding:clamp(5rem,9vw,9rem) 0;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,8vw,8rem);align-items:center}.signal-visual{position:relative;aspect-ratio:1;display:grid;place-items:center;background:radial-gradient(circle,rgba(115,216,255,.08),transparent 55%)}.core{position:relative;z-index:2;width:26%;aspect-ratio:1;border:1px solid rgba(247,147,26,.55);border-radius:50%;display:grid;place-items:center;background:radial-gradient(circle,rgba(247,147,26,.22),#071019 70%);box-shadow:0 0 3rem rgba(247,147,26,.14)}.core span{font-size:clamp(1rem,2vw,1.7rem);letter-spacing:.16em}.orbit{position:absolute;border:1px solid rgba(115,216,255,.18);border-radius:50%;animation:orbit 20s linear infinite}.orbit::after{content:"";position:absolute;left:50%;top:-.24rem;width:.42rem;aspect-ratio:1;border-radius:50%;background:#fff;box-shadow:0 0 .8rem var(--blue)}.orbit-a{inset:25%}.orbit-b{inset:13%;animation-direction:reverse;animation-duration:27s}.orbit-c{inset:2%;border-color:rgba(247,147,26,.2);animation-duration:34s}.label{position:absolute;color:#8c99a5;font-size:.55rem;letter-spacing:.12em}.label-a{top:15%;left:5%}.label-b{top:47%;right:0}.label-c{bottom:12%;left:12%}.signal-copy h2{max-width:10ch;margin:.4rem 0 2rem;font-size:clamp(3rem,5.5vw,6rem)}.principles{border-top:1px solid var(--line)}.principles article{padding:1.15rem 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:7rem 1fr;gap:1rem}.principles span{color:#ffc875;font-size:.65rem;text-transform:uppercase;letter-spacing:.12em}.principles p{margin:0;color:var(--muted);font-family:Arial,sans-serif;line-height:1.55}
.gateway{position:relative;min-height:88svh;padding:clamp(6rem,10vw,10rem) max(1rem,calc((100vw - 1240px)/2));display:flex;align-items:center;isolation:isolate;overflow:hidden}.gateway picture,.gateway-grade{position:absolute;inset:0}.gateway picture img{width:100%;height:100%;object-fit:cover}.gateway-grade{z-index:1;background:linear-gradient(90deg,rgba(2,6,10,.95),rgba(2,6,10,.65) 52%,rgba(2,6,10,.2)),linear-gradient(0deg,rgba(2,6,10,.85),transparent 55%)}.gateway-copy{position:relative;z-index:2;width:min(720px,100%)}.gateway-copy h2{max-width:12ch;margin:.4rem 0 1.3rem;font-size:clamp(3.2rem,6.2vw,6.7rem)}.gateway-copy>p:not(.kicker){max-width:60ch;color:#d2dae1;font-family:Arial,sans-serif;line-height:1.7}.path{position:absolute;z-index:2;left:max(1rem,calc((100vw - 1240px)/2));right:max(1rem,calc((100vw - 1240px)/2));bottom:2rem;display:flex;align-items:center;justify-content:center;gap:.8rem;color:#a3aeb8;font-size:.59rem;letter-spacing:.08em;text-transform:uppercase}.path i{width:clamp(1rem,5vw,5rem);height:1px;background:linear-gradient(90deg,var(--orange),var(--blue))}footer{min-height:5rem;padding:1.5rem max(1rem,calc((100vw - 1240px)/2));border-top:1px solid var(--line);display:flex;align-items:center;gap:1.4rem;color:#7f8b96;font-size:.62rem}footer span{margin-right:auto}footer a{text-decoration:none;color:#b8c1c9}
@keyframes pulse{50%{transform:scale(1.8);opacity:.45}}@keyframes orbit{to{transform:rotate(360deg)}}
@media(max-width:900px){.site-header nav{display:none}.menu{display:block}.hero-grade{background:linear-gradient(180deg,rgba(2,6,10,.35),rgba(2,6,10,.64) 45%,rgba(2,6,10,.96))}.hero-copy{margin:auto;padding:8rem 1rem 5rem;align-self:end}.chapter-cue{display:none}.section-intro,.signal{grid-template-columns:1fr}.continuum{grid-template-columns:1fr 1fr}.continuum::before{display:none}.signal-visual{width:min(520px,100%);margin:auto}.signal-copy{order:-1}.gateway-grade{background:linear-gradient(180deg,rgba(2,6,10,.4),rgba(2,6,10,.92) 52%,#02060a)}}
@media(max-width:560px){.site-header{inset:max(.65rem,env(safe-area-inset-top)) max(.75rem,env(safe-area-inset-right)) auto max(.75rem,env(safe-area-inset-left))}.brand{width:10.5rem}.hero-copy{width:100%;padding:7rem .85rem max(3.5rem,env(safe-area-inset-bottom))}.hero h1{font-size:clamp(3rem,14vw,4.35rem)}.descriptor{max-width:25ch;line-height:1.5}.actions{display:grid}.actions a{width:100%}.disclosure{font-size:.62rem}.relationship,.signal{width:calc(100vw - 1.5rem)}.section-intro h2,.signal-copy h2{font-size:clamp(2.8rem,13vw,4.4rem)}.continuum{grid-template-columns:1fr}.continuum article{min-height:230px}.node{margin:1.8rem 0}.signal{min-height:auto}.principles article{grid-template-columns:1fr}.gateway{min-height:100svh;padding-left:.85rem;padding-right:.85rem}.path{display:none}footer{flex-wrap:wrap}footer span{width:100%;order:-1}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.flow-field i,.orbit{animation:none}}
.brand{width:auto;display:flex;align-items:center;gap:.5rem}.brand img{height:auto}.brand .brand-shield{width:clamp(1.8rem,2.6vw,2.35rem)}.brand .brand-wordmark{width:clamp(9rem,15vw,13.5rem)}
@media(max-width:560px){.brand{width:auto}.brand .brand-shield{width:1.8rem}.brand .brand-wordmark{width:8.8rem}}
html{overflow-x:clip}html.menu-open{overflow:hidden}.brand{min-height:44px}.menu summary{min-height:44px}
@media(min-width:700px) and (max-width:1180px) and (max-height:820px){.hero-copy{padding:5.4rem 0 2rem}.hero h1{font-size:clamp(3rem,6vw,4.8rem)}.lead{margin:.6rem 0;font-size:.94rem;line-height:1.45}.actions{margin-top:1rem}.disclosure{margin-top:.7rem}.si0s-mark{width:11rem}.descriptor{margin:.5rem 0 .7rem}}

/* Keep the entire SASCOSM-to-SI0S gateway chapter inside the opening viewport. */
.hero{height:100svh;min-height:0}
.hero-copy{width:min(820px,calc(100vw - 2rem));padding:clamp(5.4rem,9svh,7rem) 0 clamp(3.2rem,6svh,5rem)}
.hero h1{max-width:11.5ch;font-size:clamp(3.05rem,min(5.8vw,10svh),6.2rem)}
.lead{margin:.75rem 0;font-size:clamp(.96rem,min(1.3vw,2.3svh),1.15rem);line-height:1.48}
.actions{margin-top:clamp(.75rem,1.8svh,1.35rem)}
.disclosure{margin-top:clamp(.65rem,1.4svh,1rem)}
@media(max-width:900px){.hero-copy{padding:clamp(5.65rem,10.5svh,7rem) 1rem clamp(2rem,4svh,3.5rem)}.hero h1{max-width:11ch;font-size:clamp(3rem,min(8vw,8svh),5.1rem)}}
@media(max-width:560px){.hero-copy{padding:max(4.7rem,calc(env(safe-area-inset-top) + 4.15rem)) .85rem max(1rem,env(safe-area-inset-bottom))}.kicker{margin:0 0 .42rem;font-size:.55rem;line-height:1.3}.si0s-mark{width:clamp(8.3rem,39vw,10.2rem)}.descriptor{max-width:30ch;margin:.45rem 0;font-size:.58rem;line-height:1.35;letter-spacing:.12em}.hero h1{max-width:10.6ch;font-size:clamp(2.65rem,min(12.5vw,6.2svh),3.42rem);line-height:.89}.lead{margin:.55rem 0;font-size:clamp(.82rem,3.65vw,.92rem);line-height:1.4}.actions{gap:.45rem;margin-top:.65rem}.actions a{min-height:2.65rem;padding:.62rem .8rem;font-size:.62rem}.disclosure{margin-top:.58rem;font-size:.58rem;line-height:1.35}}
@media(max-width:560px) and (max-height:740px){.hero-copy{padding-top:max(4.25rem,calc(env(safe-area-inset-top) + 3.85rem))}.si0s-mark{width:7.8rem}.descriptor{margin:.3rem 0;font-size:.52rem}.hero h1{font-size:clamp(2.32rem,11.2vw,2.75rem)}.lead{font-size:.75rem;line-height:1.31}.actions{grid-template-columns:1fr 1fr}.actions a{min-height:2.4rem;padding:.48rem .52rem;text-align:center;font-size:.55rem}.disclosure{font-size:.53rem}}
@media(min-width:901px) and (max-height:900px){.hero-copy{padding:5.3rem 0 2.8rem}.si0s-mark{width:clamp(10rem,15vw,12.5rem)}.descriptor{margin:.5rem 0 .7rem}.hero h1{font-size:clamp(3rem,min(5.4vw,9.1svh),5.2rem)}.lead{line-height:1.42}}

/* Authored public operating horizon. */
.signal{grid-template-columns:minmax(0,1.18fr) minmax(320px,.82fr)}
.signal-visual{aspect-ratio:16/11;display:block;overflow:hidden;border:1px solid rgba(214,224,232,.18);border-radius:1.2rem;background:#04090d;box-shadow:0 2.5rem 7rem rgba(0,0,0,.48)}
.horizon-media,.horizon-grade{position:absolute;inset:0}.horizon-media img{width:100%;height:100%;object-fit:cover}.horizon-grade{background:linear-gradient(180deg,rgba(2,7,11,.12),rgba(2,7,11,.25) 38%,rgba(2,7,11,.95) 90%),linear-gradient(90deg,rgba(2,7,11,.66),transparent 58%)}
.horizon-route{position:absolute;inset:42% 8% auto;height:2px;background:linear-gradient(90deg,#73d8ff,#f7931a 72%,rgba(247,147,26,.12));box-shadow:0 0 1.2rem rgba(115,216,255,.55);transform:rotate(-7deg)}.horizon-route i{position:absolute;top:50%;width:.7rem;aspect-ratio:1;border:1px solid #dff7ff;border-radius:50%;background:#061018;box-shadow:0 0 1.2rem #73d8ff;transform:translate(-50%,-50%);animation:horizon-pulse 4.8s ease-in-out infinite}.horizon-route i:nth-child(1){left:9%}.horizon-route i:nth-child(2){left:52%;animation-delay:1.2s}.horizon-route i:nth-child(3){left:91%;border-color:#ffc36f;box-shadow:0 0 1.2rem #f7931a;animation-delay:2.4s}
.horizon-focus{position:absolute;left:clamp(1rem,4vw,2.4rem);bottom:clamp(5.6rem,12vw,7.4rem);width:min(29rem,62%);display:grid;gap:.4rem;text-shadow:0 .2rem 1rem #000}.horizon-focus span{color:#ffc36f;font-size:.6rem;letter-spacing:.15em;text-transform:uppercase}.horizon-focus strong{font-family:Arial,sans-serif;font-size:clamp(1.4rem,2.8vw,2.5rem);line-height:1.02}.horizon-focus small{max-width:44ch;color:#d4dde5;font-family:Arial,sans-serif;line-height:1.5}
.bitcoin-anchor{position:absolute;right:clamp(1rem,3vw,2rem);top:clamp(1rem,3vw,2rem);display:grid;grid-template-columns:2.8rem auto;grid-template-rows:auto auto;column-gap:.7rem;align-items:center;padding:.65rem .8rem;border:1px solid rgba(247,147,26,.42);border-radius:.75rem;background:rgba(3,8,12,.72);backdrop-filter:blur(12px)}.bitcoin-anchor img{grid-row:1/3;width:2.8rem;height:2.8rem;object-fit:contain}.bitcoin-anchor span{font-size:.57rem;letter-spacing:.1em;text-transform:uppercase}.bitcoin-anchor strong{color:#f7931a;font-size:.58rem}
.horizon-controls{position:absolute;left:1rem;right:1rem;bottom:1rem;display:grid;grid-template-columns:repeat(3,1fr);gap:.45rem}.horizon-controls button{min-height:3.5rem;padding:.65rem .8rem;border:1px solid rgba(255,255,255,.14);border-radius:.6rem;background:rgba(3,8,12,.76);color:#c7d1da;text-align:left;font-size:.62rem;line-height:1.35;cursor:pointer;backdrop-filter:blur(10px)}.horizon-controls button span{display:block;margin-bottom:.25rem;color:#7f8c98;font-size:.52rem}.horizon-controls button[aria-selected="true"]{border-color:rgba(247,147,26,.7);color:#fff;background:linear-gradient(120deg,rgba(247,147,26,.2),rgba(3,8,12,.88))}.horizon-controls button[aria-selected="true"] span{color:#f7931a}
@keyframes horizon-pulse{50%{transform:translate(-50%,-50%) scale(1.65);opacity:.55}}
@media(max-width:900px){.signal{grid-template-columns:1fr}.signal-copy{order:initial}.signal-visual{width:100%;aspect-ratio:4/5}.horizon-focus{width:calc(100% - 2rem);bottom:12.3rem}.horizon-controls{grid-template-columns:1fr}.horizon-controls button{min-height:3rem}.hero-media img{object-position:center 45%}}
@media(max-width:560px){.hero-copy{padding-top:5.2rem}.hero h1{font-size:clamp(2.65rem,12vw,3.35rem)}.signal{padding-top:4rem}.signal-visual{aspect-ratio:3/5}.horizon-focus{bottom:11.7rem}.horizon-focus strong{font-size:1.42rem}.horizon-focus small{font-size:.72rem}.bitcoin-anchor span,.bitcoin-anchor strong{display:none}.bitcoin-anchor{grid-template-columns:2.4rem;padding:.45rem}.bitcoin-anchor img{width:2.4rem;height:2.4rem}.horizon-controls{left:.65rem;right:.65rem;bottom:.65rem}}
@media(prefers-reduced-motion:reduce){.horizon-route i{animation:none}}
.horizon-fallback{position:absolute;right:1rem;bottom:1rem;left:1rem;margin:0;padding:.8rem 1rem;border:1px solid rgba(247,147,26,.42);border-radius:.65rem;background:rgba(3,8,12,.84);color:#d4dde5;font-family:Arial,sans-serif;font-size:.74rem;line-height:1.5;backdrop-filter:blur(10px)}
.no-js .flow-field i,.no-js .horizon-route i{animation:none}
.no-js .horizon-controls{display:none}
.no-js .horizon-focus{bottom:5.7rem}
@media(max-width:560px){.no-js .horizon-focus{bottom:7.2rem}}