*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--ink:#07090c;--ink-2:#10141a;--paper:#f1f2ee;--paper-2:#fbfbf8;--line:rgba(7,9,12,.15);--line-dark:rgba(255,255,255,.14);--text:#111318;--muted:#5e6269;--dim:#8a8f97;--blue:#2457e6;--blue-soft:rgba(36,87,230,.09);--signal:#63f2c6;--orange:#ff6238;--white:#fff}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{font-family:'Inter',sans-serif;background:var(--paper);color:var(--text);overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit}
nav{position:fixed;inset:0 0 auto;z-index:100;height:64px;padding:0 40px;display:flex;align-items:center;justify-content:space-between;background:rgba(7,9,12,.96);border-bottom:1px solid var(--line-dark);backdrop-filter:blur(18px)}
.nav-logo{display:flex;align-items:center;text-decoration:none}.nav-links{display:flex;align-items:center;gap:28px;list-style:none}.nav-links a{color:rgba(255,255,255,.64);text-decoration:none;font-size:12px;font-weight:500;letter-spacing:.07em;text-transform:uppercase;transition:color .2s}.nav-links a:hover,.nav-links a.active{color:#fff}.nav-cta{display:flex;gap:10px}.btn-outline,.btn-solid,.btn-blue{display:inline-flex;align-items:center;justify-content:center;font-size:11px;font-weight:750;letter-spacing:.09em;text-transform:uppercase;text-decoration:none;transition:.2s}.btn-outline{padding:8px 16px;border:1px solid rgba(255,255,255,.3);color:#fff}.btn-solid{padding:8px 18px;background:#fff;color:#111}.btn-blue{padding:14px 24px;background:var(--blue);color:#fff}.btn-outline:hover{background:rgba(255,255,255,.08)}.btn-solid:hover{background:#ddd}.btn-blue:hover{background:#1946c6}

.hero{min-height:min(900px,94vh);padding-top:64px;display:grid;grid-template-columns:minmax(0,1.04fr) minmax(430px,.96fr);background:var(--ink);color:#fff;border-bottom:1px solid var(--line-dark)}
.hero-copy{position:relative;padding:clamp(76px,8vw,132px) clamp(36px,6.8vw,108px) 64px;display:flex;flex-direction:column;justify-content:center;border-right:1px solid var(--line-dark);overflow:hidden}
.hero-copy::before{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.036) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.036) 1px,transparent 1px);background-size:48px 48px;mask-image:radial-gradient(ellipse 90% 75% at 50% 43%,#000 20%,transparent 82%);pointer-events:none}
.hero-copy::after{content:'';position:absolute;left:9%;right:9%;top:51%;height:1px;background:linear-gradient(90deg,transparent,var(--signal),transparent);opacity:.42;box-shadow:0 0 18px rgba(99,242,198,.5)}
.hero-copy>*{position:relative;z-index:1}.hero-kicker{display:flex;align-items:center;gap:12px;margin-bottom:30px;font-family:'Share Tech Mono',monospace;font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:rgba(255,255,255,.56)}.hero-kicker::before{content:'';width:28px;height:1px;background:var(--signal);box-shadow:0 0 8px var(--signal)}
.hero h1{max-width:780px;margin-bottom:30px;font-size:clamp(54px,6.4vw,102px);font-weight:850;line-height:.91;letter-spacing:-.064em}.hero h1 span{display:block;color:rgba(255,255,255,.39)}
.hero-deck{max-width:650px;font-size:clamp(17px,1.35vw,22px);line-height:1.62;color:rgba(255,255,255,.68)}.hero-meta{margin-top:48px;padding-top:20px;border-top:1px solid var(--line-dark);display:flex;justify-content:space-between;gap:24px;font-family:'Share Tech Mono',monospace;font-size:10px;color:rgba(255,255,255,.44);letter-spacing:.12em;text-transform:uppercase}
.hero-visual{position:relative;min-height:560px;overflow:hidden;background:#050608}.hero-visual img{width:100%;height:100%;object-fit:cover}.hero-visual::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,9,12,.35),transparent 42%),linear-gradient(0deg,rgba(7,9,12,.76),transparent 52%)}
.visual-label{position:absolute;z-index:2;top:28px;right:28px;padding:9px 12px;border:1px solid rgba(255,255,255,.19);background:rgba(7,9,12,.68);font-family:'Share Tech Mono',monospace;font-size:8px;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.62);backdrop-filter:blur(10px)}
.visual-readout{position:absolute;z-index:2;left:28px;right:28px;bottom:27px;display:grid;grid-template-columns:repeat(2,1fr);background:rgba(7,9,12,.84);backdrop-filter:blur(12px);border:1px solid rgba(255,255,255,.17);border-top:2px solid var(--signal)}.readout{padding:17px 18px;border-right:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark)}.readout:nth-child(2n){border-right:0}.readout:nth-last-child(-n+2){border-bottom:0}.readout-label{font-family:'Share Tech Mono',monospace;font-size:8px;color:rgba(255,255,255,.45);letter-spacing:.14em;text-transform:uppercase}.readout-value{margin-top:6px;font-family:'Share Tech Mono',monospace;font-size:15px;font-weight:700;color:#fff}

.metric-strip{background:var(--paper-2);border-bottom:1px solid var(--line)}.metric-inner{max-width:1440px;margin:auto;display:grid;grid-template-columns:repeat(4,1fr)}.metric{min-height:150px;padding:27px 29px;border-right:1px solid var(--line)}.metric:last-child{border-right:0}.metric-value{font-family:'Share Tech Mono',monospace;font-size:24px;color:var(--blue);margin-bottom:17px}.metric-title{font-size:14px;font-weight:800}.metric-copy{margin-top:7px;font-size:11px;line-height:1.55;color:var(--dim)}

.guide-shell{max-width:1440px;margin:auto;display:grid;grid-template-columns:224px minmax(0,840px) minmax(190px,1fr);border-left:1px solid var(--line);border-right:1px solid var(--line)}
.toc{position:sticky;top:64px;align-self:start;height:calc(100vh - 64px);padding:50px 25px;border-right:1px solid var(--line);overflow-y:auto}.toc-label,.rail-label{margin-bottom:18px;font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}.toc a{display:block;padding:9px 0;color:var(--muted);text-decoration:none;font-size:11.5px;line-height:1.42;border-bottom:1px solid rgba(0,0,0,.07);transition:.15s}.toc a:hover,.toc a.active{color:var(--blue);padding-left:5px}
.article{padding:72px clamp(34px,5vw,74px) 116px}.back{display:inline-flex;margin-bottom:50px;color:var(--muted);text-decoration:none;font-size:12px;font-weight:650;letter-spacing:.04em;text-transform:uppercase}.back:hover{color:var(--blue)}
.section{margin-bottom:86px;scroll-margin-top:96px}.section-mark{display:flex;align-items:center;gap:12px;margin-bottom:20px;font-family:'Share Tech Mono',monospace;font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue)}.section-mark::after{content:'';flex:1;height:1px;background:var(--line)}
.section h2{max-width:735px;margin-bottom:25px;font-size:clamp(34px,4vw,57px);line-height:1.02;letter-spacing:-.045em;font-weight:830}.section h3{margin:32px 0 12px;font-size:20px;line-height:1.3;letter-spacing:-.02em}.section p{margin-bottom:19px;font-size:16px;line-height:1.82;color:var(--muted)}.section .lead{font-size:clamp(20px,2vw,27px);line-height:1.52;color:var(--text);font-weight:520;letter-spacing:-.018em}.section strong{color:var(--text)}
.quote{margin:43px 0;padding:34px 0;border-top:2px solid var(--text);border-bottom:1px solid var(--line);font-size:clamp(27px,3.4vw,46px);line-height:1.14;letter-spacing:-.04em;font-weight:780}.quote em{font-style:normal;color:var(--blue)}

.decision-grid{margin:34px 0;display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);background:var(--paper-2)}.decision{padding:28px}.decision+ .decision{border-left:1px solid var(--line)}.decision-label{font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim);margin-bottom:17px}.decision-title{font-size:20px;font-weight:800;margin-bottom:13px}.decision:first-child .decision-title{color:var(--blue)}.decision-row{padding:10px 0;border-top:1px solid var(--line);font-size:12.5px;line-height:1.55;color:var(--muted)}
.system{margin:34px 0;background:var(--ink);color:#fff;border:1px solid var(--ink)}.system-head{display:flex;justify-content:space-between;gap:20px;padding:17px 21px;border-bottom:1px solid var(--line-dark);font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.15em;text-transform:uppercase;color:rgba(255,255,255,.45)}.system-head span:last-child{color:var(--signal)}.system-row{display:grid;grid-template-columns:118px 1fr 92px;border-bottom:1px solid var(--line-dark)}.system-row:last-child{border-bottom:0}.system-row>div{padding:17px 19px;border-right:1px solid var(--line-dark);font-size:12px;line-height:1.55;color:rgba(255,255,255,.62)}.system-row>div:last-child{border-right:0}.system-id{font-family:'Share Tech Mono',monospace;color:#fff!important}.system-state{font-family:'Share Tech Mono',monospace;color:var(--signal)!important;text-align:right;text-transform:uppercase}

.formula-grid{margin:34px 0;display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}.formula-card{padding:26px;background:var(--paper-2)}.formula-label{font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.13em;text-transform:uppercase;color:var(--dim)}.formula-value{margin:14px 0 9px;font-family:'Share Tech Mono',monospace;font-size:clamp(21px,2.6vw,31px);color:var(--text)}.formula-copy{font-size:12px!important;line-height:1.62!important;margin:0!important}.callout{margin:30px 0;padding:23px 25px;border:1px solid var(--line);border-left:4px solid var(--blue);background:var(--paper-2);font-size:13px;line-height:1.7;color:var(--muted)}.callout strong{display:block;margin-bottom:5px;color:var(--text)}.callout.warn{border-left-color:var(--orange)}

.rule-list{margin:34px 0;border-top:1px solid var(--line)}.rule{display:grid;grid-template-columns:64px 1fr;gap:22px;padding:25px 0;border-bottom:1px solid var(--line)}.rule-num{font-family:'Share Tech Mono',monospace;font-size:13px;color:var(--blue)}.rule-title{font-size:17px;font-weight:800;margin-bottom:7px}.rule-copy{font-size:13.5px;line-height:1.68;color:var(--muted)}.rule-formula{display:inline-block;margin-top:10px;padding:5px 8px;background:var(--blue-soft);color:var(--blue);font-family:'Share Tech Mono',monospace;font-size:10px;letter-spacing:.06em}
.figure{margin:40px 0;background:#0c0f14;border:1px solid rgba(0,0,0,.2)}.figure img{display:block;width:100%;height:auto;max-height:560px;object-fit:contain;background:#0c0f14}.figure.light img{background:#fff}.figcap{display:grid;grid-template-columns:110px 1fr;gap:22px;padding:17px 20px;border-top:1px solid var(--line-dark);font-size:11px;line-height:1.65;color:rgba(255,255,255,.58)}.figcap strong{font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.13em;text-transform:uppercase;color:var(--signal)}

.profile-table{margin:32px 0;border:1px solid var(--line);background:var(--paper-2);overflow-x:auto}.profile-table table{width:100%;min-width:680px;border-collapse:collapse}.profile-table th{padding:13px 15px;background:var(--ink);color:#fff;text-align:left;font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.12em;text-transform:uppercase}.profile-table td{padding:15px;border-top:1px solid var(--line);border-right:1px solid var(--line);font-size:12px;line-height:1.55;color:var(--muted);vertical-align:top}.profile-table td:last-child{border-right:0}.profile-table td:first-child{font-weight:800;color:var(--text)}
.tolerance-band{margin:32px 0;display:grid;grid-template-columns:1fr 1fr 1fr;border:1px solid var(--line);background:var(--paper-2)}.tol{padding:26px;border-right:1px solid var(--line)}.tol:last-child{border-right:0}.tol-value{font-family:'Share Tech Mono',monospace;font-size:25px;color:var(--blue)}.tol-label{margin-top:13px;font-size:13px;font-weight:800}.tol-copy{margin-top:7px;font-size:11px;line-height:1.55;color:var(--dim)}

.checklist{margin:34px 0;border:1px solid var(--line);background:var(--paper-2)}.check-head{padding:21px 23px;background:var(--ink);color:#fff}.check-meta{display:flex;justify-content:space-between;gap:20px;align-items:center;font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.13em;text-transform:uppercase;color:rgba(255,255,255,.55)}.check-count{color:var(--signal)}.check-track{height:2px;margin-top:15px;background:rgba(255,255,255,.14)}.check-progress{height:100%;width:0;background:var(--signal);box-shadow:0 0 10px rgba(99,242,198,.55);transition:width .25s}.check-item{display:grid;grid-template-columns:44px 1fr;cursor:pointer;border-top:1px solid var(--line)}.check-item input{position:absolute;opacity:0;pointer-events:none}.check-box{display:flex;align-items:center;justify-content:center;border-right:1px solid var(--line);font-family:'Share Tech Mono',monospace;color:var(--dim)}.check-copy{padding:18px 20px}.check-title{font-size:13px;font-weight:800}.check-detail{margin-top:5px;font-size:11.5px;line-height:1.55;color:var(--dim)}.check-item:has(input:checked){background:rgba(36,87,230,.055)}.check-item:has(input:checked) .check-box{color:#fff;background:var(--blue)}.check-item:has(input:checked) .check-title{text-decoration:line-through;text-decoration-color:rgba(17,19,24,.35)}.check-item:focus-within{outline:2px solid var(--blue);outline-offset:-2px}

.sources{margin-top:58px;padding-top:27px;border-top:1px solid var(--line)}.sources-title{font-family:'Share Tech Mono',monospace;font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);margin-bottom:14px}.source-link{display:block;padding:10px 0;border-bottom:1px solid rgba(0,0,0,.07);color:var(--muted);font-size:12px;line-height:1.5;text-decoration:none}.source-link:hover{color:var(--blue)}
.cta{margin-top:70px;padding:44px;background:var(--ink);color:#fff}.cta-label{font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.17em;text-transform:uppercase;color:var(--signal);margin-bottom:17px}.cta h3{max-width:590px;margin:0 0 13px;font-size:31px;line-height:1.12}.cta p{max-width:620px;color:rgba(255,255,255,.6);font-size:14px;line-height:1.7}.cta .btn-blue{margin-top:12px}
.rail{padding:72px 26px;border-left:1px solid var(--line)}.rail-card{position:sticky;top:98px}.rail-statement{padding-top:17px;border-top:2px solid var(--text);font-size:18px;line-height:1.48;font-weight:750;letter-spacing:-.02em}.rail-detail{margin-top:21px;padding-top:17px;border-top:1px solid var(--line);font-family:'Share Tech Mono',monospace;font-size:9px;letter-spacing:.1em;line-height:1.8;text-transform:uppercase;color:var(--dim)}

@media(max-width:1120px){.guide-shell{grid-template-columns:205px minmax(0,1fr)}.rail{display:none}}
@media(max-width:900px){nav{padding:0 20px}.nav-links{display:none}.hero{grid-template-columns:1fr;min-height:auto}.hero-copy{min-height:640px;border-right:0;border-bottom:1px solid var(--line-dark)}.hero-visual{min-height:480px}.guide-shell{display:block;border:0}.toc{display:none}.article{padding:60px 24px 90px}.metric-inner{grid-template-columns:1fr 1fr}.metric:nth-child(2){border-right:0}.metric{border-bottom:1px solid var(--line)}}
@media(max-width:680px){.nav-cta .btn-outline{display:none}.hero-copy{min-height:590px;padding:82px 24px 48px}.hero h1{font-size:clamp(50px,15.5vw,74px)}.hero-meta{flex-direction:column;gap:8px}.hero-visual{min-height:390px}.visual-readout{left:16px;right:16px;bottom:16px}.decision-grid,.formula-grid,.tolerance-band{grid-template-columns:1fr}.decision+.decision{border-left:0;border-top:1px solid var(--line)}.formula-card{border-top:1px solid var(--line)}.tol{border-right:0;border-bottom:1px solid var(--line)}.tol:last-child{border-bottom:0}.system{overflow-x:auto}.system-row{min-width:590px}.figcap{grid-template-columns:1fr;gap:6px}.cta{padding:34px 25px}.section{margin-bottom:70px}.rule{grid-template-columns:48px 1fr;gap:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.check-progress{transition:none}}