@font-face{font-family:Saira;font-weight:500;font-display:swap;src:url(/fonts/saira-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:Saira;font-weight:600;font-display:swap;src:url(/fonts/saira-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:Saira;font-weight:700;font-display:swap;src:url(/fonts/saira-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-weight:400;font-display:swap;src:url(/fonts/ibm-plex-sans-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-weight:500;font-display:swap;src:url(/fonts/ibm-plex-sans-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-weight:600;font-display:swap;src:url(/fonts/ibm-plex-sans-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-weight:400;font-display:swap;src:url(/fonts/ibm-plex-mono-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Mono";font-weight:500;font-display:swap;src:url(/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2")}

:root{
  --ink:#000;--paper:#f3f2ee;--line:#2a2a2a;--line-soft:#1b1b1b;
  --text:#ececec;--muted:#a3a3a3;--orange:#f28a00;--orange-ink:#b86400;
  --head:Saira,"Segoe UI",system-ui,sans-serif;
  --body:"IBM Plex Sans","Segoe UI",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--ink);color:var(--text);font:400 17px/1.62 var(--body)}
img,svg{max-width:100%}
a{color:var(--text);text-decoration-color:var(--orange);text-underline-offset:3px;text-decoration-thickness:1.5px}
a:hover{color:var(--orange)}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:8px;background:var(--orange);color:#000;padding:8px 14px;z-index:99;font-family:var(--head);font-weight:600}
.skip:focus{left:8px}

/* header */
.top{position:sticky;top:0;z-index:20;background:rgba(0,0,0,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:28px;height:68px}
.brand img{height:30px;width:auto;display:block}
.nav{display:flex;gap:26px;margin-left:auto;align-items:center}
.nav a{font:500 15px var(--body);color:var(--muted);text-decoration:none;padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--text)}
.nav a[aria-current=page]{color:var(--text);border-bottom-color:var(--orange)}
.btn{display:inline-block;font:600 16px/1 var(--head);letter-spacing:.01em;padding:14px 22px;border-radius:2px;text-decoration:none;border:1.5px solid var(--orange);background:var(--orange);color:#000;cursor:pointer}
.btn:hover{background:#ffa21f;border-color:#ffa21f;color:#000}
.btn.ghost{background:transparent;color:var(--text);border-color:#5a5a5a}
.btn.ghost:hover{border-color:var(--text);color:var(--text);background:transparent}
.nav .btn{padding:10px 16px;font-size:15px;color:#000;border-bottom:1.5px solid var(--orange)}
.menu{display:none;margin-left:auto;background:none;border:1.5px solid #5a5a5a;color:var(--text);font:600 15px var(--head);padding:9px 14px;border-radius:2px}

/* hero */
.hero{padding:72px 0 80px;border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.02fr);gap:60px;align-items:center}
h1,h2,h3{font-family:var(--head);margin:0;color:#fff}
h1{font-weight:700;font-size:clamp(2.4rem,4.6vw,3.7rem);line-height:1.04;letter-spacing:-.01em;text-wrap:balance}
h2{text-wrap:balance}
.hero p.lead{font-size:1.2rem;color:#d4d4d4;max-width:34em;margin:24px 0 32px}
.actions{display:flex;gap:14px;flex-wrap:wrap}
.facts{list-style:none;margin:34px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px 26px;color:var(--muted);font-size:15px}
.facts li{padding-left:18px;position:relative}
.facts li:before{content:"";position:absolute;left:0;top:.62em;width:8px;height:8px;background:var(--orange)}

/* paper sheet */
.sheet{background:var(--paper);color:#111;border-radius:3px}
.sheet svg{display:block;width:100%;height:auto}
.sheet figcaption{display:grid;grid-template-columns:1fr auto;border-top:1.5px solid #111;font:500 13px/1.4 var(--mono);color:#111}
.sheet figcaption span{padding:10px 14px}
.sheet figcaption span+span{border-left:1.5px solid #111}
.flow{stroke-dasharray:7 9;animation:flow 1.1s linear infinite}
.flow.slow{animation-duration:1.7s}
@keyframes flow{to{stroke-dashoffset:-32}}
@media (prefers-reduced-motion:reduce){.flow{animation:none}}

/* sections */
section{padding:84px 0;border-bottom:1px solid var(--line)}
section.tight{padding:56px 0}
h2{font-weight:600;font-size:clamp(1.8rem,3.2vw,2.5rem);line-height:1.1;letter-spacing:-.005em;max-width:20em}
h3{font-weight:600;font-size:1.25rem;line-height:1.25}
.intro{color:var(--muted);max-width:38em;margin:16px 0 0;font-size:1.08rem}
.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:64px;align-items:start}
.split.rev{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.stack>*+*{margin-top:20px}

/* equipment strip */
.strip{padding:0;border-bottom:1px solid var(--line)}
.strip .wrap{display:grid;grid-template-columns:repeat(5,1fr)}
.strip .wrap>div{padding:22px 20px 22px 0;border-right:1px solid var(--line);margin-right:20px}
.strip .wrap>div:last-child{border-right:0;margin-right:0}
.strip b{display:block;font:600 1rem var(--head);color:#fff}
.strip span{font-size:14px;color:var(--muted)}

/* steps */
.steps{list-style:none;margin:36px 0 0;padding:0;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding:0 0 30px 64px}
.steps li:before{content:counter(s);position:absolute;left:0;top:-4px;font:700 2.2rem/1 var(--head);color:var(--orange);width:44px}
.steps li:after{content:"";position:absolute;left:14px;top:40px;bottom:6px;width:1px;background:var(--line)}
.steps li:last-child:after{display:none}
.steps h3{margin-bottom:4px}
.steps p{margin:0;color:var(--muted)}

/* data tables */
.tbl{width:100%;border-collapse:collapse;font-size:15.5px}
.tbl th{font:600 14px var(--head);text-align:left;color:#fff;padding:12px 14px;border-bottom:1.5px solid #fff;white-space:nowrap}
.tbl td{padding:14px;border-bottom:1px solid var(--line);vertical-align:top;color:#d6d6d6}
.tbl td:first-child{color:#fff}
.tbl code,.mono{font-family:var(--mono);font-size:.92em}
.diff td.chg{color:var(--orange);font-weight:500}
.diff th.r,.diff td.r{text-align:right;font-family:var(--mono);white-space:nowrap}
.panel{border:1px solid var(--line);padding:6px 6px 2px;position:sticky;top:96px}
@media (max-width:980px){.panel{position:static}}
.panel .cap{font:500 13px var(--mono);color:var(--muted);padding:10px 14px 4px}
.scroll{overflow-x:auto}

/* status */
.st{white-space:nowrap;font-size:14.5px;color:#d6d6d6}
.st:before{content:"";display:inline-block;width:10px;height:10px;margin-right:9px;vertical-align:-1px;border:1.5px solid #fff;background:#fff}
.st.test:before{border-color:var(--orange);background:transparent}
.st.draft:before{border:1.5px dashed var(--orange);background:transparent}
.st.plan:before{border:1.5px dashed #6b6b6b;background:transparent}
.legend{display:flex;gap:22px;flex-wrap:wrap;margin:0 0 18px;font-size:14px;color:var(--muted)}

/* keep list */
.rules{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;margin-top:40px;border-top:1px solid var(--line)}
.rules div{padding:26px 32px 26px 0;border-bottom:1px solid var(--line)}
.rules div:nth-child(odd){border-right:1px solid var(--line);margin-right:32px}
.rules h3{margin-bottom:6px}
.rules p{margin:0;color:var(--muted)}

/* faq */
details{border-bottom:1px solid var(--line)}
details:first-of-type{border-top:1px solid var(--line)}
summary{cursor:pointer;list-style:none;padding:20px 40px 20px 0;font:600 1.1rem var(--head);color:#fff;position:relative}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";position:absolute;right:6px;top:15px;font:500 1.7rem var(--head);color:var(--orange)}
details[open] summary:after{content:"\2212"}
details .a{padding:0 0 22px;color:#cfcfcf;max-width:46em}
details .a p{margin:0 0 .8em}

/* prose pages */
.page{padding-top:64px;padding-bottom:96px}
.page h1{font-size:clamp(2.2rem,4.4vw,3.2rem);margin-bottom:12px}
.page .intro{margin-bottom:12px}
.prose{max-width:46em}
.prose h2{font-size:1.5rem;margin:44px 0 10px;max-width:none}
.prose h3{margin:28px 0 6px}
.prose p,.prose li{color:#d4d4d4}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin:.35em 0}
.draft-note{border-left:3px solid var(--orange);padding:10px 16px;margin:24px 0;background:#0d0d0d;color:#d9d9d9;font-size:15px;max-width:46em}
.guide{display:grid;grid-template-columns:minmax(0,1fr);gap:0}
.guide h2{font-size:1.5rem;margin:48px 0 8px;max-width:none}
.kv{display:grid;grid-template-columns:11em 1fr;gap:8px 20px;margin:14px 0;font-size:16px}
.kv dt{color:var(--muted)}.kv dd{margin:0;color:#e6e6e6}

/* forms */
form.f{display:grid;gap:18px;max-width:560px}
.f label{display:block;font:600 14px var(--head);color:#fff;margin-bottom:6px}
.f input,.f select,.f textarea{width:100%;background:#000;color:#fff;border:1.5px solid #4a4a4a;border-radius:2px;padding:12px 14px;font:400 16px var(--body)}
.f textarea{min-height:150px;resize:vertical}
.f input:focus,.f select:focus,.f textarea:focus{border-color:var(--orange);outline:none}
.f .hint{font-size:13.5px;color:var(--muted);margin-top:5px}
.f .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.hp{position:absolute;left:-9999px}
.msg{padding:14px 16px;border:1px solid var(--line);font-size:15.5px;display:none}
.msg.show{display:block}.msg.ok{border-color:#fff}.msg.err{border-color:var(--orange)}

/* footer */
footer{padding:56px 0 40px}
.block{display:grid;grid-template-columns:2fr 1.2fr 1.2fr 1.2fr;border:1.5px solid #5a5a5a}
.block>div{padding:20px 22px}
.block>div+div{border-left:1.5px solid #5a5a5a}
.block h4{margin:0 0 10px;font:600 14px var(--head);color:#fff}
.block ul{list-style:none;margin:0;padding:0}.block li{margin:5px 0;font-size:15px}
.block a{color:var(--muted);text-decoration:none}.block a:hover{color:var(--orange)}
.block img{height:34px;width:auto}
.block p{margin:12px 0 0;font-size:14.5px;color:var(--muted)}
.fine{margin-top:22px;font-size:13.5px;color:#8a8a8a;max-width:70em}
.fine a{color:#b5b5b5}

@media (max-width:980px){
  .hero .wrap,.split,.split.rev{grid-template-columns:minmax(0,1fr);gap:44px}
  .strip .wrap{grid-template-columns:repeat(2,1fr)}
  .strip .wrap>div{border-right:0;margin:0;padding:16px 12px 16px 0;border-bottom:1px solid var(--line-soft)}
  .block{grid-template-columns:1fr 1fr}.block>div:nth-child(3){border-left:0}.block>div:nth-child(n+3){border-top:1.5px solid #5a5a5a}
  .rules{grid-template-columns:1fr}.rules div:nth-child(odd){border-right:0;margin-right:0}
}
@media (max-width:780px){
  .menu{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:68px;background:#000;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 18px}
  .nav.open{display:flex}
  .nav a{padding:14px 0;border-bottom:1px solid var(--line-soft);font-size:17px}
  .nav .btn{margin-top:14px;text-align:center;padding:14px}
  .top .wrap{height:62px}.nav{top:62px}
  .hero{padding:44px 0 56px}section{padding:60px 0}
  .f .row{grid-template-columns:1fr}
  .kv{grid-template-columns:1fr;gap:2px}.kv dd{margin-bottom:10px}
}
@media (max-width:520px){
  body{font-size:16.5px}.wrap{padding:0 18px}
  .block{grid-template-columns:1fr}.block>div+div{border-left:0;border-top:1.5px solid #5a5a5a}
  .strip .wrap{grid-template-columns:1fr}
  .actions .btn{flex:1 1 100%;text-align:center}
}

@media (max-width:700px){
  .mods thead{display:none}
  .mods,.mods tbody,.mods tr,.mods td{display:block;width:100%}
  .mods tr{padding:16px 0;border-bottom:1px solid var(--line)}
  .mods td{border:0;padding:2px 0}
  .mods td:first-child{font:600 1.15rem var(--head)}
  .mods td:last-child{padding-top:6px}
  .diff th,.diff td{padding:12px 8px}
}
.mhit{border-top:1px solid var(--line,#333);padding:12px 0}.mhit p{margin:6px 0 0;font-size:.92rem;opacity:.85}.mhit mark{background:#ffd23f;color:#000;padding:0 2px}
.mh{font-size:1.05rem}.mk{display:block;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;opacity:.65;margin-bottom:2px}.mhit ul{margin:6px 0 6px 1.1em;font-size:.92rem}