:root{
  color-scheme:light;--bg:#fff;--surface:#f7f8fc;--surface-2:#eeeff7;--border:#e7e8ef;--text:#222334;--muted:#686b80;--accent:#3536c7;--accent-light:#f0efff;--code-bg:#f7f8fc;--mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--header-height:72px
}
[data-mode=dark]{color-scheme:dark;--bg:#14151b;--surface:#1c1d27;--surface-2:#252634;--border:#2d2e3c;--text:#e9eaf3;--muted:#a2a4b8;--accent:#afa8ff;--accent-light:#292541;--code-bg:#1a1b24}
*{box-sizing:border-box}html{scroll-padding-top:140px}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.75 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}button{color:inherit;background:none;border:0}a,button{transition:color .15s,background .15s,border-color .15s}[hidden]{display:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-80px;left:16px;z-index:100;background:var(--accent);color:var(--bg);padding:12px 20px}.skip-link:focus{top:12px}
.docs-header{height:var(--header-height);display:flex;align-items:center;gap:36px;padding:0 max(32px,calc((100vw - 1440px)/2));border-bottom:1px solid var(--border);background:var(--bg);position:sticky;top:0;z-index:30}
.docs-brand{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:19px;font-weight:650;letter-spacing:-.6px}.brand-lockup{display:flex;flex-direction:column;align-items:flex-start;gap:0;line-height:1}.docs-brand img{flex:none;width:148px;height:auto}.brand-lockup a{display:block;color:inherit;text-decoration:none}.brand-lockup a:hover small{color:var(--accent)}.brand-lockup small{font:10px/1.2 var(--mono);letter-spacing:.03em;color:var(--muted);margin-top:-1px}[data-mode=dark] .docs-brand img{filter:brightness(0) invert(1)}.docs-label{font-size:14px;font-weight:450;color:var(--muted);letter-spacing:0}.brand-divider{font-weight:300;color:var(--border);padding:0 2px;font-size:24px}
.search-form{height:36px;display:flex;align-items:center;gap:10px;width:340px;margin:auto;position:relative;color:var(--muted);padding:0 12px;border:1px solid var(--border);background:var(--surface);border-radius:7px}.search-form>span{font-size:24px;line-height:1}.search-form input{width:100%;min-width:0;border:0;outline:0;background:transparent;color:var(--text);font-size:13px}.search-form input:focus-visible{outline:0}.search-form:focus-within{border-color:var(--accent)}.search-form kbd{font:12px var(--sans);white-space:nowrap;border:1px solid var(--border);border-radius:3px;padding:2px 4px}.header-links{display:flex;gap:24px;align-items:center;font-size:13px;white-space:nowrap}.header-links a:hover{color:var(--accent)}#theme-toggle{font-size:23px;width:32px;height:32px;display:grid;place-items:center;border-radius:5px}#theme-toggle:hover{background:var(--surface-2)}
.docs-subheader{height:48px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0 max(32px,calc((100vw - 1440px)/2));font-size:13px}.docs-subheader>span{display:flex;gap:12px;align-items:center;color:var(--muted)}.docs-subheader strong{font-size:12px;font-weight:500;padding:0 7px;border:1px solid var(--border);border-radius:5px}.docs-subheader>a{color:var(--accent);font-weight:550}
.docs-layout{max-width:1440px;margin:auto;display:grid;grid-template-columns:232px minmax(0,1fr) 180px;gap:56px;padding:0 32px}.docs-sidebar{position:sticky;top:var(--header-height);height:calc(100vh - var(--header-height));padding:32px 0 40px;overflow-y:auto;scrollbar-width:thin}.docs-sidebar section,.mobile-nav section{margin-bottom:24px}.docs-sidebar h2,.mobile-nav h2{font-size:12px;font-weight:650;color:var(--text);margin:0 0 9px;padding-left:12px;letter-spacing:.02em}.docs-sidebar nav a,.mobile-nav nav a{display:block;font-size:13px;color:var(--muted);padding:6px 12px;border-radius:5px;line-height:1.6;margin:2px 0}.docs-sidebar a:hover,.mobile-nav nav a:hover{background:var(--surface);color:var(--text)}.docs-sidebar a[aria-current=page],.mobile-nav a[aria-current=page]{background:var(--accent-light);color:var(--accent);font-weight:550}.sidebar-footer{display:block;font-size:12px;color:var(--muted);margin:32px 12px 0;border-top:1px solid var(--border);padding-top:20px}
.docs-article{padding:43px 0 40px;min-width:0;max-width:800px;width:100%;margin:auto;outline:none}.article-kicker{color:var(--accent);font-size:13px;font-weight:550;margin-bottom:10px}.article-heading{display:flex;gap:20px;align-items:center;justify-content:space-between}.article-heading h1{font-size:34px;line-height:1.25;letter-spacing:-1.2px;font-weight:650;margin:0}.copy-page{font-size:12px;white-space:nowrap;color:var(--muted);padding:6px 9px;border-radius:5px}.copy-page:hover{background:var(--surface)}.article-description{font-size:17px;line-height:1.65;color:var(--muted);margin:16px 0 30px}.article-body{font-size:15px;line-height:1.85}.article-body>p:first-child{margin-top:0}.article-body p{margin:17px 0}.article-body h2{font-size:23px;font-weight:620;letter-spacing:-.6px;line-height:1.4;margin:42px 0 16px;padding-top:3px;scroll-margin-top:100px}.article-body h3{font-size:18px;line-height:1.4;font-weight:600;letter-spacing:-.25px;margin:28px 0 12px}.article-body a:not(.doc-cards a){color:var(--accent);text-decoration:underline;text-underline-offset:4px;text-decoration-color:color-mix(in srgb,var(--accent) 30%,transparent)}.article-body a:hover{text-decoration-color:var(--accent)}.article-body ul,.article-body ol{padding-left:23px;margin:20px 0}.article-body li{padding-left:4px;margin:8px 0}.article-body strong{font-weight:600}.article-body code{font:13px/1.6 var(--mono);color:var(--text);border:1px solid var(--border);background:var(--surface);padding:2px 5px;border-radius:4px;overflow-wrap:anywhere}.article-body pre{background:var(--code-bg);border:1px solid var(--border);border-radius:8px;padding:22px;overflow:auto;position:relative;margin:22px 0;line-height:1.8;max-width:100%;tab-size:4}.article-body pre code{padding:0;border:0;background:none;line-height:1.8;overflow-wrap:normal;font-size:12.5px}.code-frame{border:1px solid var(--border);border-radius:8px;overflow:hidden;margin:22px 0}.code-frame .code-top{display:flex;align-items:center;justify-content:space-between;padding:7px 14px;background:var(--code-bg);border-bottom:1px solid var(--border);font:12px var(--mono);color:var(--muted)}.code-top button{font:12px var(--sans);padding:4px 7px;border-radius:4px}.code-top button:hover{background:var(--surface-2)}.code-frame pre{border:0;border-radius:0;margin:0}.code-keyword{color:var(--accent)}.code-string{color:#247263}.code-comment{color:var(--muted);font-style:italic}[data-mode=dark] .code-string{color:#a2d8b8}
.table-scroll{overflow-x:auto;margin:24px 0;border:1px solid var(--border);border-radius:7px}.article-body table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.65;text-align:left;margin:24px 0}.table-scroll table{margin:0}.article-body th{background:var(--surface);font-weight:600;color:var(--text)}.article-body td,.article-body th{border-bottom:1px solid var(--border);vertical-align:top;padding:11px 13px}.article-body tr:last-child td{border-bottom:0}.article-body table code{font-size:12px;overflow-wrap:anywhere}.article-body blockquote{border-left:3px solid var(--accent);background:var(--surface);margin:24px 0;padding:2px 20px;color:var(--muted)}.article-body hr{border:0;border-top:1px solid var(--border);margin:30px 0}
.docs-toc{position:sticky;top:105px;height:fit-content;padding-top:39px;font-size:12px;color:var(--muted)}.docs-toc nav>p{font-weight:600;color:var(--text);margin:0 0 14px}.docs-toc nav>a{display:block;border-left:1px solid var(--border);padding:5px 0 5px 14px;line-height:1.6}.docs-toc nav>a:hover,.docs-toc nav>a[aria-current=true]{color:var(--accent);border-left-color:var(--accent)}.toc-support{border-top:1px solid var(--border);margin-top:28px;padding-top:20px;display:flex;flex-direction:column;gap:6px}.toc-support a{color:var(--accent)}
.intro-illustration{border:1px solid var(--border);border-radius:10px;margin:28px 0 34px;padding:25px 28px;background:var(--surface)}.diagram-label{font:11px var(--mono);letter-spacing:.1em;color:var(--muted);font-size:12px}.loop-diagram{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:25px 0}.loop-diagram>span{padding:9px 13px;border:1px solid var(--border);border-radius:6px;background:var(--bg);font-size:13px;font-weight:550}.loop-diagram>b{color:var(--muted);font-weight:400}.loop-diagram>.loop-model{background:var(--accent);color:var(--bg);border-color:var(--accent)}[data-mode=dark] .loop-diagram>.loop-model{color:#14151b}.diagram-foundation{display:flex;justify-content:space-between;gap:10px;font-size:12px;color:var(--muted);border-top:1px solid var(--border);padding-top:16px}
.doc-cards{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:26px 0 36px}.doc-cards>a{display:flex;flex-direction:column;gap:9px;border:1px solid var(--border);border-radius:8px;padding:21px;transition:border-color .15s,background .15s}.doc-cards>a:hover{border-color:var(--accent);background:var(--surface)}.doc-cards span{font:12px var(--mono);color:var(--muted)}.doc-cards strong{font-size:15px}.doc-cards p{color:var(--muted);font-size:13px;line-height:1.7;margin:0}
.page-pagination{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:56px 0 32px}.page-pagination>a{border:1px solid var(--border);padding:16px 20px;border-radius:8px;display:flex;flex-direction:column;gap:4px}.page-pagination>a:last-child{text-align:right}.page-pagination>a:hover{border-color:var(--accent);background:var(--surface)}.page-pagination span{font-size:12px;color:var(--muted)}.page-pagination strong{font-size:14px;font-weight:550}.article-footer{display:flex;flex-wrap:wrap;gap:12px 20px;justify-content:space-between;border-top:1px solid var(--border);padding-top:20px;color:var(--muted);font-size:12px}.article-footer a:hover{color:var(--accent)}
.search-results{position:fixed;top:62px;left:50%;transform:translateX(-50%);width:min(620px,calc(100% - 32px));background:var(--bg);border:1px solid var(--border);border-radius:9px;z-index:50;box-shadow:0 12px 40px #10102018;max-height:70vh;overflow:auto;padding:12px}.search-results>p{font-size:12px;color:var(--muted);margin:4px 12px 8px}.search-results a{display:block;padding:12px;border-radius:5px}.search-results a:hover,.search-results a:focus{background:var(--surface);outline-offset:-2px}.search-results strong{display:block;font-size:14px;font-weight:600}.search-results small{font-size:12px;color:var(--muted)}.mobile-nav{display:none}.not-found{max-width:600px;margin:15vh auto;padding:24px}.not-found h1{font-size:36px;line-height:1.2}.not-found a{display:block;color:var(--accent);margin-top:20px}
@media(min-width:1600px){.docs-layout{gap:68px;grid-template-columns:240px minmax(0,1fr) 190px}}
@media(max-width:1200px){.docs-layout{grid-template-columns:210px minmax(0,1fr);gap:44px}.docs-toc{display:none}.docs-header{gap:24px}.search-form{max-width:300px}.header-links{gap:18px}.docs-article{max-width:740px}}
@media(max-width:850px){.docs-header{height:auto;min-height:68px;flex-wrap:wrap;padding:16px 24px;gap:14px}.docs-brand{font-size:18px}.header-links{margin-left:auto}.header-links a:first-child{display:none}.search-form{order:3;width:100%;max-width:none}.docs-subheader{padding:0 24px}.docs-layout{display:block;padding:0 24px}.docs-sidebar{display:none}.docs-article{padding-top:28px}.mobile-nav{display:block;border-bottom:1px solid var(--border)}.mobile-nav summary{display:flex;justify-content:space-between;cursor:pointer;padding:15px 0;font-size:13px;color:var(--muted)}.mobile-nav nav{padding:8px 0 16px;max-height:60vh;overflow:auto;display:grid;grid-template-columns:1fr 1fr;gap:12px}.mobile-nav h2{margin-top:8px}.search-results{top:116px}.article-heading h1{font-size:31px}.article-heading{align-items:flex-start}.copy-page{padding:7px 0}.docs-subheader{height:44px}.article-description{font-size:16px}.docs-toc{display:none}}
@media(max-width:520px){.docs-header{padding:14px 20px;gap:12px}.docs-layout{padding:0 20px}.docs-subheader{padding:0 20px}.header-links{gap:14px}.docs-brand{gap:8px}.docs-brand img{width:142px;height:auto}.docs-brand .brand-divider,.docs-brand .docs-label{display:none}.docs-label{font-size:13px}.article-heading{flex-wrap:wrap;gap:8px}.article-heading h1{font-size:30px}.article-description{margin-top:12px}.article-body{font-size:14px}.article-body h2{font-size:21px}.article-body pre{padding:16px}.doc-cards{grid-template-columns:1fr}.intro-illustration{padding:18px 14px}.loop-diagram{gap:4px}.loop-diagram>span{font-size:12px;padding:7px}.diagram-foundation{flex-wrap:wrap;justify-content:start;gap:8px 20px}.page-pagination{gap:12px}.page-pagination>a{padding:13px}.page-pagination strong{font-size:13px}.article-footer{justify-content:flex-start}.search-form kbd{display:none}.mobile-nav nav{grid-template-columns:1fr 1fr}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto;transition:none}}
@media print{.docs-header,.docs-sidebar,.docs-toc,.mobile-nav,.docs-subheader,.copy-page,.code-top button,.page-pagination,.search-results{display:none}.docs-layout{display:block;max-width:none}.docs-article{max-width:none;padding:0}.article-body pre{white-space:pre-wrap}.article-body h2{break-after:avoid}.article-body pre,.article-body table{break-inside:avoid}}
/* harness map */
.harness-map{display:flex;flex-direction:column;gap:14px}
.map-row{display:flex;flex-wrap:wrap;align-items:stretch;gap:8px;font-size:12px}
.map-row-label{font:11px/1.4 var(--mono);letter-spacing:.09em;text-transform:uppercase;color:var(--muted);flex:0 0 100%;margin-bottom:-2px}
.map-row>a{display:inline-flex;flex-direction:column;gap:1px;padding:6px 11px;border:1px solid var(--border);border-radius:7px;background:var(--bg);font-weight:550;line-height:1.45;transition:border-color .15s,background .15s}
.map-row>a small,.map-node small{font-size:11px;line-height:1.5;color:var(--muted);font-weight:400}
.map-row>a:hover,.map-node:hover{border-color:var(--accent)}
.map-loop{display:flex;align-items:stretch;justify-content:space-between;gap:8px;margin-top:4px}
.map-loop>b{align-self:center;color:var(--muted);font-weight:400;font-size:17px;flex:none}
.map-node{flex:1 1 0;min-width:0;display:flex;flex-direction:column;gap:3px;padding:12px 13px;border:1px solid var(--border);border-radius:8px;background:var(--bg);transition:border-color .15s}
.map-node>a{font-size:14px;font-weight:620;margin-bottom:3px}
.map-node.map-model{background:var(--accent);border-color:var(--accent);color:var(--bg)}
.map-node.map-model small{color:color-mix(in srgb,var(--bg) 80%,transparent)}
[data-mode=dark] .map-node.map-model,[data-mode=dark] .map-node.map-model small{color:#14151b}
.map-loop-note{font-size:12px;color:var(--muted);margin:-2px 0 2px;text-align:center}
.map-around,.map-beneath{border-top:1px solid var(--border);padding-top:14px}
.article-body .intro-illustration.harness-map a{color:inherit;text-decoration:none}
.article-body .intro-illustration.harness-map small a{text-decoration:underline;text-underline-offset:3px;text-decoration-color:color-mix(in srgb,currentColor 35%,transparent)}
.article-body .intro-illustration.harness-map small a:hover{text-decoration-color:currentColor}
@media(max-width:640px){.map-loop{flex-direction:column}.map-loop>b{transform:rotate(90deg);line-height:1;font-size:15px}.harness-map .map-row>a{flex:1 1 calc(50% - 8px)}}
/* harness track */
.harness-map,.hx-track{--on-accent:#fff}[data-mode=dark] .harness-map,[data-mode=dark] .hx-track{--on-accent:#14151b}
.hx-track{display:block;width:100%;height:auto;margin-top:6px;overflow:visible}
.hx-track text{font-family:var(--sans);fill:var(--text)}
.hx-track .t{font-size:13px;font-weight:620}.hx-track .t2{font-size:12px;font-weight:560}
.hx-track .s{font-size:10.5px;fill:var(--muted)}
.hx-track .k{fill:var(--text);font-weight:600}
.hx-track .lab{font-family:var(--mono);font-size:10px;letter-spacing:.09em;fill:var(--muted)}
.hx-track .mono{font-family:var(--mono);font-size:10px;fill:var(--muted);text-anchor:middle}
.hx-track #hx-arrow path{fill:var(--muted)}
.hx-road-ghost{fill:none;stroke:none}
.hx-road,.hx-ramp,.hx-entry{fill:none;stroke:color-mix(in srgb,var(--accent) 22%,var(--border));stroke-width:10;stroke-linecap:round;stroke-linejoin:round}
.hx-ramp{stroke-width:6;stroke-dasharray:1 9}.hx-entry{stroke-width:4;stroke-dasharray:1 7}
.hx-pin circle{fill:var(--bg);stroke:var(--accent);stroke-width:2}
.hx-slab-depth{fill:var(--border)}.hx-slab-top{fill:var(--surface-2);stroke:var(--border)}
.hx-chip rect,.hx-station rect{fill:var(--bg);stroke:var(--border);transition:stroke .15s}
.hx-chip:hover rect,.hx-station:hover rect{stroke:var(--accent)}
.hx-model rect{fill:var(--accent);stroke:var(--accent)}
.hx-model text{fill:var(--on-accent)}.hx-model .s{fill:color-mix(in srgb,var(--on-accent) 80%,transparent)}
.hx-result rect{stroke:color-mix(in srgb,var(--accent) 55%,var(--border))}
.hx-fallback{display:none}
/* durability sequence, same theme as the track */
.hx-track #hx-arrow-pg path{fill:var(--muted)}
.hx-track .halo{paint-order:stroke;stroke:var(--bg);stroke-width:4px;stroke-linejoin:round}
.hx-seq .hx-entry{stroke:var(--border);stroke-width:2;stroke-dasharray:2 6}
.hx-crash path{fill:none;stroke:var(--muted);stroke-width:3;stroke-linecap:round}
.hx-steps{margin:0;padding-left:22px;font-size:14px;line-height:1.7}.hx-steps li{margin:6px 0}
@media(max-width:640px){.hx-track{display:none}.hx-fallback{display:flex;flex-direction:column;gap:14px}}