:root{--orange:#e67e22;--tower:#737a80;--tower-dark:#343a3f;--deck:#c8c6bf;--deck-light:#ebe8df;--asphalt:#171b1e;--ink:#121517;--sky:#cbd7dc;--blue:#b9ebff;--max:1240px;--mono:Consolas,"Courier New",monospace;--sans:"Microsoft YaHei","PingFang SC","Segoe UI",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:140px}body{margin:0;background:var(--deck);color:var(--ink);font:16px/1.7 var(--sans);overflow-x:hidden}body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:-2;background:linear-gradient(rgba(255,255,255,.15),rgba(0,0,0,.03)),repeating-linear-gradient(90deg,transparent 0 119px,rgba(25,30,33,.04) 120px),repeating-linear-gradient(0deg,transparent 0 47px,rgba(25,30,33,.035) 48px)}
a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.wrap{width:min(var(--max),calc(100% - 48px));margin:auto}
.header{position:sticky;top:0;z-index:100;height:64px;color:#fff;background:rgba(49,55,60,.96);border-bottom:4px solid var(--orange)}.nav{height:100%;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:10px;font-weight:900}.brand img{width:32px;height:32px;object-fit:contain;background:#fff;border:2px solid #111}.official{font:800 10px var(--mono);letter-spacing:.1em;background:var(--blue);color:#101820;border:1px solid #000;padding:3px 7px}.navlinks{margin-left:auto;display:flex;align-items:center;gap:27px;font-size:14px}.navlinks>a:not(.btn):hover{color:#ffd0a3}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 22px;border:2px solid #111;background:#fff;color:#111;font-weight:900;box-shadow:4px 4px 0 #111;transition:.18s}.btn:hover{transform:translate(-1px,-1px);box-shadow:6px 6px 0 #111}.btn.outline{background:transparent;box-shadow:none}.btn.orange{background:var(--orange);color:#111}.btn.dark{background:#15191b;color:#fff}.menu{display:none;border:1px solid #fff;background:transparent;color:#fff;padding:7px 10px}
.hero{position:relative;padding:84px 0 100px;overflow:hidden;background:linear-gradient(#c9d6da 0 42%,#b6bec0 42% 44%,#a9a8a2 44%)}.hero::before,.hero::after{content:"";position:absolute;top:0;width:7px;height:100%;background:var(--tower);border:2px solid #24292c}.hero::before{left:8%}.hero::after{right:8%}.cable{position:absolute;inset:0;pointer-events:none}.cable::before{content:"";position:absolute;left:-4%;right:-4%;top:-130px;height:360px;border:5px solid var(--orange);border-color:transparent transparent var(--orange);border-radius:0 0 50% 50%}.hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}.status{display:inline-flex;gap:8px;align-items:center;padding:5px 12px;background:#e7e7e2;border:1px solid #1c2022;font:800 12px var(--mono)}.status i{width:8px;height:8px;border-radius:50%;background:#59a858;box-shadow:0 0 0 3px #bfe1b9}.hero h1{font-size:clamp(40px,5vw,62px);line-height:1.05;font-weight:900;letter-spacing:-.04em;margin:20px 0}.ice{color:#164e63;text-shadow:1px 1px 0 var(--blue)}.lead{max-width:650px;color:#343a3d;font-size:17px}.actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}.console{background:#111619;color:#d8e0e2;border:4px solid #30363a;box-shadow:12px 12px 0 rgba(29,34,37,.32)}.console-head{height:45px;border-bottom:1px solid #5e676c;display:flex;align-items:center;gap:7px;padding:0 15px;font:700 12px var(--mono)}.dot{width:10px;height:10px;border-radius:50%;background:#d56045}.dot:nth-child(2){background:#e6b13e}.dot:nth-child(3){background:#5aa266}.console-head b{margin-left:8px}.console-media{position:relative;aspect-ratio:16/10;overflow:hidden}.console-media img{width:100%;height:100%;object-fit:cover;filter:grayscale(.25) contrast(1.05)}.console-media::after{content:"BRIDGE NODE // R1";position:absolute;bottom:14px;left:14px;background:#111619;border-left:4px solid var(--orange);padding:6px 10px;font:700 11px var(--mono)}.console-foot{display:flex;justify-content:space-between;padding:12px 15px;border-top:1px solid #5e676c;font:12px var(--mono)}.console-foot b{color:#91d37d}
.anchorbar{position:sticky;top:64px;z-index:90;background:rgba(62,68,72,.96);color:#fff;border-bottom:4px solid var(--orange)}.anchor-inner{height:72px;display:grid;grid-template-columns:240px 1fr;align-items:center;gap:24px}.anchor-title{font-weight:900;border-left:6px solid var(--orange);padding-left:14px}.anchors{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.anchors a{position:relative;text-align:center;border:1px solid #92999d;padding:7px 9px;font-size:13px;background:#484f53}.anchors a::before{content:"";position:absolute;top:-22px;left:50%;height:20px;border-left:2px solid var(--orange)}.anchors a:hover{background:var(--orange);color:#111}
.section{padding:88px 0;border-bottom:3px solid #4b5053;scroll-margin-top:140px}.head{display:flex;justify-content:space-between;align-items:end;gap:32px;margin-bottom:38px}.eyebrow{font:800 12px var(--mono);letter-spacing:.18em;color:#8d3f08}.section h2{font-size:clamp(29px,4vw,43px);line-height:1.15;margin:7px 0;font-weight:900}.note{max-width:500px;color:#4e5457}.spec-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:3px solid #1d2225;border-left:3px solid #1d2225}.spec{min-height:260px;padding:25px;background:#d6d4cd;border-right:3px solid #1d2225;border-bottom:3px solid #1d2225;transition:.2s}.spec:hover{transform:translateY(-2px);background:#e5e2d9;box-shadow:inset 0 0 0 3px var(--orange)}.spec small{font:800 11px var(--mono);color:#a64709}.spec h3{font-size:22px;margin:44px 0 10px}.spec p{color:#4d5356;font-size:14px}
.dark{background:#080a0e;color:#e7e8e5;border-color:#000}.dark .note{color:#9da5a8}.dark .eyebrow{color:#f0984c}.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.scene{min-height:220px;padding:23px;border:1px solid #596064;background:#101418}.scene-icon{width:42px;height:42px;display:grid;place-items:center;border:2px solid var(--orange);font:800 17px var(--mono);margin-bottom:30px}.scene h3{color:#fff}.scene p{color:#9ca4a8;font-size:14px}
.rack{border-top:3px solid #1c2124}.rack-row{display:grid;grid-template-columns:260px 1fr 240px;min-height:112px;align-items:center;border-bottom:3px solid #1c2124;background:#d5d3cc}.rack-row.featured{border-left:4px solid var(--blue)}.rack-row>div{padding:20px 24px}.model strong{display:block;font-size:20px}.model small,.rack-spec{color:#52585a}.rack-action{height:100%;border-left:1px solid #777d80;display:flex;align-items:center;justify-content:space-between}.rack-action b{font:900 19px var(--mono)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}.image-frame{position:relative;padding:12px;background:#b8b6b0;border:3px solid #262b2e;box-shadow:10px 10px 0 #72777a}.image-frame::before{content:"";position:absolute;left:50%;top:-33px;height:30px;border-left:3px solid var(--orange)}.image-frame img{width:100%;aspect-ratio:16/10;object-fit:cover;filter:saturate(.8)}.steps{display:grid;border-top:2px solid #22272a;counter-reset:n}.step{display:grid;grid-template-columns:65px 1fr;gap:15px;padding:19px 0;border-bottom:1px solid #5d6265}.step::before{counter-increment:n;content:"0" counter(n);font:900 21px var(--mono);color:#a4490b}.step h3,.step p{margin:0}.step p{font-size:14px;color:#555b5e}.channel{display:flex;align-items:center;justify-content:space-between;padding:17px 0;border-bottom:1px solid #555b5e}.channel b{font-size:18px}.channel span{font:700 12px var(--mono)}
.metrics{display:grid;grid-template-columns:repeat(4,1fr);border:3px solid #1c2124;background:#dedbd3}.metric{text-align:center;padding:28px 10px;border-right:1px solid #4f5558}.metric:last-child{border:0}.metric b{display:block;font:900 40px var(--mono)}.metric span{font-size:13px;color:#52585b}.banner{margin-top:24px;background:#30363a;color:#fff;border-left:7px solid var(--orange);padding:24px 28px;display:flex;justify-content:space-between;align-items:center;gap:26px}.terminal{background:#0e1215;color:#dce2e5;border:3px solid #2d3337;box-shadow:9px 9px 0 #7a7e7e}.termbar{padding:11px 15px;border-bottom:1px solid #60686b;font:12px var(--mono)}pre{margin:0;padding:22px;overflow:auto;color:inherit;font:13px/1.8 var(--mono);white-space:pre}.explain{display:grid;gap:18px}.explain article{border-left:5px solid var(--orange);padding-left:20px}.explain h3,.explain p{margin:0}.explain p{color:#51575a}
.faq{max-width:740px;margin:auto;border-top:3px solid #1d2225}details{border-bottom:2px solid #454b4e;background:#d6d4cd}summary{list-style:none;position:relative;padding:20px 52px 20px 18px;cursor:pointer;font-weight:900}summary::-webkit-details-marker{display:none}summary::after{content:"+";position:absolute;right:18px;top:13px;font:300 29px var(--mono);transition:.2s}details[open] summary::after{transform:rotate(45deg)}details p{padding:0 18px 20px;margin:0;color:#505659}
.news{border-top:3px solid #1d2225}.news-item{display:grid;grid-template-columns:140px 1fr 100px;gap:20px;align-items:center;padding:21px 10px;border-bottom:1px solid #4f5558}.news-item time{font:700 12px var(--mono)}.news-item h3,.news-item p{margin:0}.news-item p{font-size:14px;color:#53595c}.news-item a{text-align:right;font-weight:900}.extra{display:none}.news.expanded .extra{display:grid}.more{margin-top:22px;padding:9px 17px;border:2px solid #22272a;background:transparent;font-weight:900;cursor:pointer}
.footer{background:#06070a;color:#aeb4b6;padding:68px 0 24px;border-top:5px solid var(--orange)}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:42px}.footer h3,.footer h4{color:#fff}.footer p{max-width:430px;color:#7e878b}.footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}.footer a:hover{color:#ffc18b}.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:44px;padding-top:20px;border-top:1px solid #363b3e;font-size:12px;color:#71797d}
/* web page: bridge control lane */
.web-layout{display:grid;grid-template-columns:90px 1fr;min-height:100vh}.lane-markers{background:#373d41;border-right:5px solid var(--orange);color:#fff;padding-top:40px}.lane-markers span{display:block;writing-mode:vertical-rl;margin:0 auto 45px;font:800 12px var(--mono);letter-spacing:.15em}.web-main{padding:60px clamp(20px,5vw,72px) 90px}.web-intro{display:grid;grid-template-columns:1fr 420px;gap:48px;align-items:end}.web-intro h1{font-size:clamp(42px,7vw,78px);line-height:.95;margin:16px 0}.prompt{background:#dcd9d1;border:3px solid #24292c;padding:20px;box-shadow:9px 9px 0 #74797b}.prompt label{display:block;font:800 11px var(--mono);margin-bottom:8px}.prompt textarea{width:100%;min-height:100px;background:#efede7;border:2px solid #33383b;padding:12px;resize:vertical}.prompt-actions{display:flex;gap:10px;margin-top:10px}.answer{margin-top:44px;background:#d8d5cd;border:3px solid #252a2d;padding:30px;box-shadow:10px 10px 0 #777b7d}.answer-meta{display:flex;justify-content:space-between;border-bottom:1px solid #5f6567;padding-bottom:12px;font:12px var(--mono)}.answer-body{max-width:820px;padding-top:22px}.web-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.web-card{padding:22px;border:2px solid #292e31;background:#d8d5cd;border-top:6px solid var(--orange)}
/* help page: bridge maintenance manual */
.help-hero{padding:72px 0 48px;background:linear-gradient(135deg,#cbd1d2,#abaeac)}.help-title{display:grid;grid-template-columns:1fr 320px;gap:50px;align-items:end}.help-title h1{font-size:clamp(42px,7vw,80px);line-height:.95;margin:15px 0}.stamp{border:5px double #33383b;padding:22px;text-align:center;font:800 13px var(--mono);transform:rotate(1deg);background:#d7d5ce}.search{display:flex;max-width:780px;margin-top:38px;border:3px solid #282d30}.search input{flex:1;background:#e3e0d8;border:0;padding:14px 17px;outline:0}.search button{border:0;background:#2e3438;color:#fff;padding:0 23px;font-weight:900}.help-layout{display:grid;grid-template-columns:250px 1fr;gap:44px;padding:60px 0 90px}.toc{position:sticky;top:90px;align-self:start;background:#aaaca8;border:3px solid #292e31;padding:19px}.toc strong,.toc a{display:block}.toc strong{margin-bottom:12px}.toc a{padding:8px 0;border-bottom:1px solid #686d6f}.article{padding:34px 0;border-top:3px solid #252a2d;scroll-margin-top:90px}.article h2{font-size:31px}.article-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.box{padding:20px;border:2px solid #2c3134;background:#d9d6cf}.api-table{width:100%;border-collapse:collapse}.api-table th,.api-table td{border:1px solid #303538;padding:12px;text-align:left}.api-table th{background:#81878a;color:#fff}.search-hidden{display:none!important}
@media(max-width:980px){.spec-grid{grid-template-columns:repeat(2,1fr)}.scenes{grid-template-columns:repeat(2,1fr)}.rack-row{grid-template-columns:210px 1fr}.rack-action{grid-column:1/-1;border-left:0;border-top:1px solid #777d80}.split{gap:36px}.footer-grid{grid-template-columns:1.5fr 1fr 1fr}.footer-brand{grid-column:1/-1}.web-intro{grid-template-columns:1fr}.web-cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.wrap{width:min(100% - 28px,var(--max))}.menu{display:block}.navlinks{display:none;position:absolute;top:64px;left:0;right:0;background:#343a3f;padding:18px;flex-direction:column;align-items:stretch;border-bottom:4px solid var(--orange)}.navlinks.open{display:flex}.hero{padding:55px 0}.hero-grid,.split{grid-template-columns:1fr}.anchor-inner{height:auto;grid-template-columns:1fr;padding:12px 0}.anchors{grid-template-columns:repeat(4,minmax(138px,1fr));overflow:auto;padding-top:21px}.section{padding:64px 0}.head{display:block}.spec-grid,.scenes{grid-template-columns:1fr}.rack-row{grid-template-columns:1fr}.rack-action{grid-column:auto}.metrics{grid-template-columns:repeat(2,1fr)}.metric:nth-child(2){border-right:0}.metric:nth-child(-n+2){border-bottom:1px solid #4f5558}.banner{align-items:flex-start;flex-direction:column}.news-item,.news.expanded .extra{grid-template-columns:1fr;gap:7px}.news-item a{text-align:left}.footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}.footer-bottom{flex-direction:column}.web-layout{display:block}.lane-markers{display:none}.web-main{padding:40px 15px 70px}.web-cards{grid-template-columns:1fr}.help-title,.help-layout,.article-grid{grid-template-columns:1fr}.toc{position:relative;top:0}.search{display:grid;grid-template-columns:1fr}.search button{min-height:48px}}
@media print{.header,.anchorbar,.actions,.more,.search,.toc,.footer,.lane-markers{display:none!important}body{background:#fff}.hero-grid,.split,.help-layout,.web-intro{display:block}.dark{background:#fff;color:#000}.section,.article{padding:25px 0}.spec-grid,.scenes,.web-cards{grid-template-columns:1fr}.console,.terminal{background:#fff;color:#000;box-shadow:none}.web-layout{display:block}.web-main{padding:0}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}