:root{--ink:#171a20;--body:#393c41;--muted:#6e7075;--line:#e2e3e3;--ash:#f4f4f4;--white:#fff;--blue:#e82127;--danger:#b3261e;--header:56px;--ease:cubic-bezier(.5,0,0,.75)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header) + 16px);background:var(--white)}
body{margin:0;background:var(--white);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;font-size:14px;line-height:20px;overflow-x:hidden}
a{color:inherit}a,button{-webkit-tap-highlight-color:transparent}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
.skip-link{position:fixed;left:16px;top:10px;z-index:200;transform:translateY(-150%);padding:9px 13px;border-radius:4px;background:var(--ink);color:#fff;text-decoration:none;font-weight:600}.skip-link:focus{transform:none}
.wrap{width:min(1180px,calc(100% - 48px));margin:0 auto}
.site-header{position:fixed;inset:0 0 auto;z-index:80;height:var(--header);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 clamp(24px,3vw,44px);background:rgba(255,255,255,.92);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(226,227,227,.55)}
.brand{justify-self:start;display:inline-flex;align-items:center;min-height:40px;text-decoration:none;font-size:13px;font-weight:600;letter-spacing:.20em;white-space:nowrap}.brand-mark{width:28px;height:28px;margin-right:9px;border-radius:4px;display:grid;place-items:center;background:var(--ink);color:#fff;font-size:12px;letter-spacing:0}
.site-nav,.header-actions{display:flex;align-items:center;gap:2px}.header-actions{justify-self:end}.site-nav a,.header-actions a{min-height:40px;padding:4px 13px;border-radius:4px;display:inline-flex;align-items:center;text-decoration:none;font-weight:500;transition:background-color .25s var(--ease),color .25s var(--ease)}.site-nav a:hover,.header-actions a:hover{background:rgba(23,26,32,.08);color:var(--blue)}.header-actions .current{color:var(--blue)}
.mobile-menu-toggle{display:none;min-width:64px;height:42px;border:0;border-radius:4px;background:var(--ash);color:var(--ink);font:inherit;font-weight:600;cursor:pointer}.mobile-menu-sheet{display:none}
main{padding-top:var(--header)}
.eyebrow{margin:0 0 14px;color:var(--muted);font-weight:600}.hero{min-height:calc(88vh - var(--header));padding:clamp(72px,10vw,132px) 0 82px;display:flex;align-items:center}.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.65fr);gap:clamp(56px,9vw,124px);align-items:end}
h1,h2,h3,p{margin-top:0}h1{margin-bottom:0;max-width:760px;font-size:clamp(48px,6.4vw,82px);line-height:.98;font-weight:520;letter-spacing:-.045em}h2{margin-bottom:0;font-size:clamp(31px,4vw,48px);line-height:1.08;font-weight:520;letter-spacing:-.03em}h3{margin-bottom:0;font-size:17px;line-height:23px;font-weight:600}.hero-deck{margin:24px 0 0;max-width:670px;color:var(--body);font-size:18px;line-height:27px}.copy{margin:16px 0 0;max-width:720px;color:var(--body);font-size:15px;line-height:23px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.button{min-width:176px;min-height:42px;padding:0 22px;border-radius:4px;display:inline-flex;align-items:center;justify-content:center;text-decoration:none;font-weight:600;transition:background-color .25s var(--ease),color .25s var(--ease)}.button.primary{background:var(--blue);color:#fff}.button.primary:hover{background:#345fc7}.button.secondary{background:var(--ash);color:var(--body)}.button.secondary:hover{background:#e9e9e9}.button.outline{border:1px solid var(--line);background:#fff}.button.outline:hover{background:var(--ash)}
.pass{color:var(--blue)}
.result-card{padding:26px;border:1px solid var(--line);border-radius:8px;background:#fff}.result-card strong{display:block;margin-top:7px;font-size:28px;line-height:34px;font-weight:520}.result-card p{margin:9px 0 0;color:var(--body)}.result-card .safety{margin-top:22px;padding-top:20px;border-top:1px solid var(--line)}.result-card .fail{color:var(--danger)}.result-card .pass{color:var(--blue)}
.metrics{padding:34px 0;background:var(--ash)}.metric-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:42px}.metric span{display:block;color:var(--muted);font-size:12px;line-height:18px;font-weight:600}.metric strong{display:block;margin-top:5px;font-size:22px;line-height:28px;font-weight:520}
.section{padding:clamp(72px,9vw,116px) 0}.section.ash{background:var(--ash)}.section.dark{background:var(--ink);color:#fff}.section.dark .eyebrow,.section.dark .copy{color:#b7b9bd}.section-head{display:grid;grid-template-columns:minmax(180px,.38fr) minmax(0,1fr);gap:56px;align-items:start;margin-bottom:48px}
.goal-grid,.boundary-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,.65fr);gap:clamp(48px,8vw,104px);align-items:center}.goal-points{display:grid;gap:0;border-top:1px solid var(--line)}.goal-point{padding:17px 0;border-bottom:1px solid var(--line)}.goal-point strong{display:block;font-weight:600}.goal-point span{display:block;margin-top:5px;color:var(--muted)}
.threshold-card{padding:26px;border:1px solid var(--line);border-radius:8px;background:#fff}.threshold-card strong{display:block;font-size:28px;line-height:34px;font-weight:520}.threshold-card p{margin:8px 0 0;color:var(--body)}.threshold-chart{position:relative;height:72px;margin-top:25px;padding-top:26px}.threshold-track{height:6px;border-radius:999px;background:#e5e6e7;overflow:hidden}.threshold-fill{width:81.17%;height:100%;background:var(--danger)}.threshold-limit,.threshold-result{position:absolute;top:15px;width:2px;height:31px;background:var(--ink)}.threshold-limit{left:75%}.threshold-result{left:81.17%;background:var(--danger)}.threshold-limit:after,.threshold-result:after{position:absolute;top:35px;white-space:nowrap;font-size:11px;color:var(--muted)}.threshold-limit:after{content:"max 2.25×";right:6px}.threshold-result:after{content:"result 2.435×";left:6px;color:var(--danger)}.threshold-foot{margin-top:18px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;line-height:18px}
.phase12-threshold .threshold-fill{width:74.345%;background:var(--blue)}.phase12-threshold .threshold-result{left:74.345%;background:var(--blue)}.phase12-threshold .threshold-result:after{content:"final 2.23035×";color:var(--blue)}
.three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:42px}.card{padding:20px;border:1px solid var(--line);border-radius:8px;background:var(--white)}.card p{margin:10px 0 0;color:var(--body)}.card .tag{display:block;margin-top:18px;color:var(--muted);font-size:12px}.section.dark .card{border-color:#42454b;background:rgba(255,255,255,.03)}.section.dark .card p{color:#d0d2d6}
#homeModelRail{overflow:hidden}.rail-head{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:26px}.text-link{color:var(--muted);text-decoration:none}.text-link:hover{color:var(--ink)}.rail-scroll{overflow-x:auto;padding:4px 0 16px;scrollbar-width:thin}.home-rail-grid{display:grid;grid-template-columns:repeat(14,minmax(82px,1fr));min-width:1180px}.home-rail-step{position:relative;min-height:88px;padding:18px 8px 8px;border-top:1px solid var(--line);text-align:center;text-decoration:none;color:var(--body);font-weight:600}.home-rail-step:before{content:"";position:absolute;top:-4px;left:50%;width:7px;height:7px;border-radius:50%;background:#b8babc;transform:translateX(-50%)}.home-rail-step small{display:block;margin-top:4px;color:var(--muted);font-size:11px;font-weight:400}.home-rail-step:hover{background:#fafafa}.home-rail-step.active{color:var(--blue)}.home-rail-step.active:before{background:var(--blue)}
.evidence-list{display:grid;grid-template-columns:1fr 1fr;gap:0 36px;border-top:1px solid var(--line)}.evidence-item{padding:18px 0;border-bottom:1px solid var(--line)}.evidence-item span{display:block;color:var(--muted)}.evidence-item strong{display:block;margin-top:5px;font-size:17px;line-height:22px;font-weight:600}.provenance{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px;border-top:1px solid var(--line);padding-top:22px}.provenance span{display:block;color:var(--muted);font-size:12px}.provenance strong,.provenance code{display:block;margin-top:6px;color:var(--ink);font-size:13px;line-height:19px;overflow-wrap:anywhere}.provenance code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-weight:400}
.footer{min-height:72px;padding:20px clamp(24px,3vw,44px);border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:24px;color:var(--muted);font-size:12px}.footer p{margin:0}.footer-links{display:flex;gap:20px}.footer a{text-decoration:none}.footer a:hover{color:var(--blue)}
@media(max-width:980px){.site-header{grid-template-columns:1fr auto}.site-nav,.header-actions{display:none}.mobile-menu-toggle{display:inline-flex;align-items:center;justify-content:center;justify-self:end}.mobile-menu-sheet{position:fixed;inset:0;z-index:100;padding:18px;background:#fff;display:flex;flex-direction:column;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-8px);transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s}.mobile-menu-sheet.open{opacity:1;visibility:visible;pointer-events:auto;transform:none}.mobile-menu-head{height:42px;display:flex;align-items:center;justify-content:space-between}.mobile-menu-close{min-width:64px;height:42px;border:0;border-radius:4px;background:var(--ash);font:inherit;font-weight:600}.mobile-menu-links{margin:auto 0;display:grid;gap:2px}.mobile-menu-links a{min-height:48px;display:flex;align-items:center;text-decoration:none;font-size:28px;line-height:34px;font-weight:520}.mobile-menu-meta{display:grid;grid-template-columns:1fr 1fr;gap:8px}.mobile-menu-meta a{min-height:44px;border-radius:4px;background:var(--ash);display:flex;align-items:center;justify-content:center;text-decoration:none;font-weight:600}body.menu-open{overflow:hidden}.hero{min-height:auto}.hero-grid,.section-head,.goal-grid,.boundary-grid{grid-template-columns:1fr;gap:38px}.metric-grid{grid-template-columns:1fr 1fr}.three{grid-template-columns:1fr;gap:28px}.provenance{grid-template-columns:1fr 1fr}}
@media(max-width:600px){:root{--header:52px}.site-header{height:52px;padding-inline:16px}.brand{font-size:11px}.brand-mark{width:26px;height:26px}.wrap{width:calc(100% - 36px)}.hero{padding:58px 0 54px}h1{font-size:46px}.hero-deck{font-size:16px;line-height:24px}.actions{display:grid;grid-template-columns:1fr}.button{width:100%;min-width:0}.metrics{padding:28px 0}.metric-grid{grid-template-columns:1fr;gap:28px}.section{padding:60px 0}.section-head{gap:14px;margin-bottom:32px}.evidence-list{grid-template-columns:1fr}.provenance{grid-template-columns:1fr}.threshold-card,.card{padding:18px}.threshold-limit:after{right:3px}.threshold-result:after{left:3px}.footer{align-items:flex-start;flex-direction:column}.footer-links{flex-wrap:wrap}.mobile-menu-meta{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button,.site-nav a,.header-actions a,.mobile-menu-sheet{transition:none}}