.audience{display:flex;border:1px solid var(--line);border-radius:7px;padding:3px;gap:2px;white-space:nowrap}.audience a{padding:8px 11px;font-size:11px;color:var(--muted);border-radius:4px}.audience a[aria-current=page]{background:#224138;color:var(--mint)}.engineer-intro{padding:65px 0 42px;display:grid;grid-template-columns:1.5fr 1fr;gap:70px;align-items:end}.engineer-intro h1{font-size:clamp(42px,5vw,74px)}.engineer-intro .lead{font-size:20px;margin:25px 0 0}.engineer-principle{border-left:2px solid var(--mint);padding:5px 0 5px 25px}.engineer-principle>.mono{font-size:10px;color:var(--mint);letter-spacing:.1em}.engineer-principle>p{font-size:21px;line-height:1.5;margin:18px 0;color:var(--text);letter-spacing:-.02em}.control-map{border:1px solid var(--line);border-radius:14px;padding:28px 35px;background:radial-gradient(ellipse at 50% 50%,#16313a,transparent 65%),#0d1822;margin-bottom:55px}.map-top{display:flex;flex-direction:column;gap:8px;text-align:center}.map-label,.map-side>span,.map-engine>span{font:10px monospace;letter-spacing:.09em;color:var(--mint)}.map-top>strong{font-size:18px;font-weight:500}.map-top>span:not(.map-label){font:10px monospace;color:var(--muted)}.map-top b{color:var(--mint);font-weight:400}.map-middle{display:grid;grid-template-columns:1fr 1.5fr 1fr;gap:40px;align-items:center;margin-top:4px}.map-side{border:1px solid #3b5667;padding:22px;border-radius:10px;position:relative;text-align:center}.map-side:after{content:'↔';position:absolute;right:-30px;top:45%;color:var(--blue)}.map-side.store-node:after{right:auto;left:-30px}.map-side strong{display:block;font-size:25px;font-weight:500;margin-top:12px}.map-side p{font-size:12px;margin:10px 0}.map-side small{font-size:10px}.map-engine{border:1px solid #76efce70;padding:26px 20px;text-align:center;border-radius:12px;box-shadow:0 0 35px #76efce09;background:#11302780}.map-engine strong{display:block;font-size:20px;margin:14px 0;font-weight:500}.map-engine p{font-size:12px}.map-engine button,.map-bottom button,.authority-flow button{border:0;padding:0;color:var(--mint);font-size:11px;text-decoration:underline dotted;text-underline-offset:5px}.map-bottom{border:1px dashed #bfa4f480;border-radius:10px;padding:20px 25px;margin:25px 0 20px;display:flex;align-items:center;justify-content:space-between;gap:25px;background:#c2a5f906}.map-bottom .map-label{display:block;color:var(--purple);margin-bottom:10px}.map-bottom strong{font-size:16px;font-weight:500}.map-bottom p{font-size:12px;margin:8px 0 0}.map-bottom button{flex-shrink:0;color:var(--purple)}.mechanism-tabs{display:flex;gap:8px;flex-wrap:wrap}.mechanism-tabs button{font-size:12px;background:#111e2a;padding:12px 17px}.mechanism-tabs button[aria-pressed=true]{background:#16392f;color:var(--mint)}.mechanism-heading{display:flex;justify-content:space-between;gap:30px;align-items:center;padding:30px 0}.mechanism-heading>div:first-child{max-width:750px}.mechanism-heading h3{font-size:30px}.mechanism-heading p{font-size:14px;margin:15px 0 0}.mechanism-heading .eyebrow{font-size:10px;margin-bottom:10px}.term-list{display:flex;flex-wrap:wrap;gap:10px;max-width:320px;justify-content:flex-end}.term-list button{border:1px dashed #526a75;padding:8px 11px;font:11px monospace;color:var(--blue)}.trace-layout{display:grid;grid-template-columns:1fr 1.55fr;border:1px solid var(--line);border-radius:12px;overflow:hidden}.trace-column{padding:25px;background:#0c1822}.trace-caption{font:9px monospace;color:var(--muted);letter-spacing:.1em}.trace-column #trace-steps{display:flex;flex-direction:column;gap:22px;margin-top:22px}.trace-step{position:relative;text-align:left;display:grid;grid-template-columns:27px 1fr;gap:6px 10px;background:#13222e;border:1px solid #2d4655;padding:16px}.trace-step:not(:last-child):after{content:'↓';position:absolute;bottom:-21px;left:26px;color:#5a778a}.trace-step>span{grid-row:span 2;font:11px monospace;color:var(--mint);padding-top:3px}.trace-step strong{font-size:13px;font-weight:500;line-height:1.5}.trace-step small{font:9px monospace;color:var(--blue)}.trace-step[aria-pressed=true]{border-color:var(--mint);background:#15372f}.trace-detail{padding:30px 35px;background:linear-gradient(130deg,#152634,#111b27);border-left:1px solid var(--line)}.trace-meta{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:20px}.trace-meta>.mono{font-size:10px;color:var(--muted)}.trace-detail h3{font-size:28px}.trace-detail>p{font-size:14px;margin:15px 0 22px}.trace-detail dt{font:9px monospace;letter-spacing:.1em;color:var(--mint);margin:18px 0 6px}.trace-detail dd{font-size:13px;line-height:1.7;color:#becdd6;margin:0}.code-caption{font:9px/1.6 monospace;color:var(--blue);margin:25px 0 9px}.trace-detail pre{margin:0;background:#08121b;border:1px solid #2b4051;padding:20px;border-radius:8px;overflow:auto;color:#b4deef;font:12px/1.85 monospace;white-space:pre-wrap;overflow-wrap:anywhere}.code-sources{font:10px/1.8 monospace;color:var(--muted);margin:18px 0 20px;overflow-wrap:anywhere}.code-sources span{display:block}.mechanism-invariant{display:flex;align-items:baseline;gap:25px;padding:20px 24px;border:1px solid #76efce30;background:#76efce06;border-radius:8px;margin-top:15px}.mechanism-invariant>span{font:10px monospace;color:var(--mint)}.mechanism-invariant p{font-size:13px;margin:0}.authority-flow{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.authority-flow>div{border-top:2px solid var(--mint);background:var(--panel);padding:24px;border-radius:0 0 9px 9px}.authority-flow>div>span{display:block;font:10px monospace;color:var(--mint);margin-bottom:16px}.authority-flow strong{font-size:19px;font-weight:500;line-height:1.4;display:block}.authority-flow p{font-size:13px;margin:13px 0 17px}.gate-directory-heading{margin:45px 0 23px;display:flex;gap:40px;align-items:start}.gate-directory-heading h3{font-size:24px;min-width:260px}.gate-directory-heading p{font-size:13px;margin:0}.human-row{border-top:1px solid var(--line)}.human-row:last-child{border-bottom:1px solid var(--line)}.human-row summary{display:grid;grid-template-columns:190px 1fr 25px;gap:25px;align-items:center;padding:21px 5px}.human-row summary>strong{font-size:14px;font-weight:550}.human-row summary>span{font:11px/1.8 monospace;color:var(--blue);overflow-wrap:anywhere}.human-row summary>b{font-weight:400;color:var(--mint)}.human-row[open] summary>b{transform:rotate(45deg)}.human-body{display:grid;grid-template-columns:1fr 1fr;gap:18px 35px;padding:0 30px 23px 215px}.human-body p{font-size:13px;margin:0}.human-body p>strong{display:block;font:10px monospace;color:var(--mint);margin-bottom:9px}.human-body small{grid-column:1/-1;font:10px/1.6 monospace;overflow-wrap:anywhere}.authority-caveats{display:grid;grid-template-columns:1fr 1fr;gap:35px;margin-top:35px}.authority-caveats article{border-left:1px solid var(--line);padding-left:22px}.authority-caveats h3{font-size:24px}.authority-caveats p{font-size:13px;margin:15px 0}.authority-caveats small{font-size:10px}.lab-section{background:linear-gradient(130deg,#142230,#0d1820)}.decision-lab{display:grid;grid-template-columns:1.6fr 1fr;gap:35px}.lab-controls{display:flex;gap:8px;flex-wrap:wrap}.lab-controls button{background:#142d35;font-size:12px}.lab-controls #lab-change{border-color:#c49d6a;color:var(--amber)}.lab-controls #lab-reset{background:transparent}.lab-hint{font-size:12px;margin:17px 0}.lab-log{height:260px;overflow:auto;background:#080f17;border:1px solid var(--line);border-radius:10px;padding:20px;font:12px/1.7 monospace;color:#b7cbdc}.lab-log>div{padding:9px 0;border-bottom:1px solid #1a2c37}.lab-log>div[data-type=refused]{color:var(--red)}.lab-log>div[data-type=ok]{color:var(--mint)}.lab-state{background:#0d1721;padding:10px 25px 20px;border:1px solid var(--line);border-radius:10px}.lab-state>div{padding:17px 0;border-bottom:1px solid var(--line)}.lab-state span{font:9px monospace;letter-spacing:.06em;color:var(--muted);display:block;margin-bottom:8px}.lab-state strong{font:14px monospace;color:var(--blue)}.lab-state p{font-size:12px;margin:20px 0 0}.lab-section>.wrap>.source-note{margin:22px 0 0}.engineering-sources>p{max-width:900px;font-size:14px;margin:23px 0}.engineering-sources .source-grid{padding-bottom:0}.engineering-sources small{font:10px/1.8 monospace;overflow-wrap:anywhere}dialog{background:#12212e;color:var(--text);border:1px solid #53716e;border-radius:14px;max-width:560px;width:calc(100% - 36px);padding:35px;box-shadow:0 25px 130px #0009}dialog::backdrop{background:#030b14bb;backdrop-filter:blur(5px)}#concept-close{position:absolute;right:16px;top:14px;border:0;font-size:26px;padding:4px 8px}dialog .eyebrow{font-size:10px;padding-right:35px}dialog h2{font-size:32px}#concept-definition{font-size:15px;margin:22px 0}.concept-impact{border-left:2px solid var(--mint);padding:13px 18px;background:#76efce07}.concept-impact>span{font:10px monospace;color:var(--mint)}.concept-impact>p{font-size:14px;margin:10px 0 0}dialog .source-note{margin:22px 0 0}.engineering-link{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:20px 24px;margin-bottom:35px;border:1px solid #81b7ff60;border-radius:10px;background:#81b7ff08}.engineering-link strong{font-size:15px;font-weight:500;color:var(--text)}.engineering-link span{font-size:12px;color:var(--blue)}.inspector .mechanic-link{font-size:11px;margin-top:15px;display:block;color:var(--mint)}
@media(max-width:1050px){.engineering .topbar nav{gap:15px}.engineer-intro{gap:35px}.map-middle{gap:30px}.map-side:after{right:-24px}.map-side.store-node:after{left:-24px}.trace-layout{grid-template-columns:1fr 1.4fr}.trace-detail{padding:25px}.trace-column{padding:20px}.term-list{max-width:230px}.human-body{padding-left:5px}}
@media(max-width:800px){.engineer-intro{grid-template-columns:1fr;padding-top:40px;gap:30px}.engineer-intro h1{font-size:52px}.engineer-principle>p{font-size:19px}.control-map{padding:25px 18px}.map-middle{grid-template-columns:1fr;gap:25px}.map-engine{grid-row:1}.map-side:after,.map-side.store-node:after{content:'↕';left:50%;top:-22px;right:auto}.map-bottom{display:block;padding:20px}.map-bottom button{margin-top:18px}.mechanism-heading{display:block}.term-list{max-width:unset;justify-content:start;margin-top:20px}.trace-layout{grid-template-columns:1fr}.trace-column #trace-steps{display:grid;grid-template-columns:1fr 1fr;gap:9px}.trace-step{padding:12px;grid-template-columns:18px 1fr;gap:5px}.trace-step strong{font-size:11px}.trace-step small{font-size:8px}.trace-step:not(:last-child):after{display:none}.trace-detail{border-left:0;border-top:1px solid var(--line)}.trace-detail pre{font-size:11px;padding:15px}.mechanism-invariant{display:block}.mechanism-invariant p{margin-top:10px}.authority-flow{grid-template-columns:1fr;gap:16px}.gate-directory-heading{display:block}.gate-directory-heading p{margin-top:15px}.human-row summary{grid-template-columns:1fr 24px;gap:8px 20px}.human-row summary>strong{grid-column:1}.human-row summary>span{grid-column:1}.human-row summary>b{grid-column:2;grid-row:1/3}.human-body{grid-template-columns:1fr;padding:0 5px 22px;gap:15px}.authority-caveats,.decision-lab{grid-template-columns:1fr}.engineering-link{display:block}.engineering-link span{display:block;margin-top:10px}.engineering .topbar .brand{font-size:14px}.audience a{padding:7px 9px;font-size:10px}.mechanism-tabs button{padding:10px 13px;font-size:11px}.engineer-intro .eyebrow{font-size:9px}.engineering-sources h2{font-size:33px}}

.engineer-nav{color:var(--blue);font-size:12px;white-space:nowrap}.engine-detail .mechanic-link{color:var(--blue);font-size:12px}.engineering-link{margin-top:0}.engineering-link:hover{border-color:var(--mint)}@media(max-width:450px){.engineer-nav{font-size:10px}.topbar:has(.engineer-nav){gap:9px}.topbar:has(.engineer-nav) .quiet{padding:9px;font-size:10px}}

/* Mechanism selector: a distinct control surface for the trace below. */
.mechanism-tabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(158px,1fr));gap:11px;max-width:1040px;margin:0 auto;padding:14px;border:1px solid #4a5966;border-radius:16px;background:linear-gradient(135deg,#101b26,#0b141d);box-shadow:inset 0 1px #ffffff08,0 18px 40px #00000020}.mechanism-tabs button{min-height:68px;display:flex;align-items:center;justify-content:center;text-align:center;border:1px solid #3a4c5b;border-radius:10px;padding:14px 17px;background:linear-gradient(145deg,#162533,#0e1923);color:#c9d4dc;font-size:15px;font-weight:600;letter-spacing:.01em;box-shadow:inset 0 1px #ffffff06;transition:background .18s ease,border-color .18s ease,color .18s ease,box-shadow .18s ease,transform .18s ease}.mechanism-tabs button:hover{border-color:#d8874b;color:#ffe0c5;background:linear-gradient(145deg,#38251a,#1b2023);transform:translateY(-1px)}.mechanism-tabs button[aria-pressed=true]{border-color:#ff9a5a;color:#ffe3cf;background:linear-gradient(145deg,#6b321e,#2e211f);box-shadow:0 0 0 1px #ffb07755,0 0 30px #f56f2d7a,inset 0 1px #ffd4b84a;text-shadow:0 0 16px #ffbd91aa}.mechanism-tabs button:focus-visible{outline-color:#ffad75;outline-offset:4px}@media(min-width:1101px){.mechanism-tabs{grid-template-columns:repeat(7,minmax(0,1fr))}}@media(max-width:800px){.mechanism-tabs{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;padding:10px}.mechanism-tabs button{min-height:58px;padding:11px 10px;font-size:12px}}@media(max-width:460px){.mechanism-tabs{grid-template-columns:1fr}.mechanism-tabs button{min-height:54px}}
.trace-column .trace-next-section{display:flex;align-items:center;justify-content:center;gap:14px;width:100%;margin:26px 0 0;padding:15px 18px;border:1px solid #ff9a5a;border-radius:10px;background:linear-gradient(135deg,#7a3820,#35211d);color:#ffe4d2;font-size:14px;font-weight:650;letter-spacing:.01em;box-shadow:0 0 0 1px #ffb07755,0 0 32px #f56f2d75,inset 0 1px #ffd4b84a;transition:transform .18s ease,box-shadow .18s ease,background .18s ease}.trace-column .trace-next-section:hover{transform:translateY(-2px);background:linear-gradient(135deg,#914324,#41231d);box-shadow:0 0 0 1px #ffc09375,0 0 42px #ff773b9c,inset 0 1px #ffe1ce73}.trace-column .trace-next-section b{font-size:20px;line-height:1;font-weight:500}.trace-column .trace-next-section:focus-visible{outline:2px solid #ffcfad;outline-offset:5px}