:root{
  --bg:#f7f9fc;
  --surface:#fff;
  --surface-soft:#eef4ff;
  --text:#172033;
  --muted:#62708a;
  --line:#dfe6ef;
  --blue:#2563eb;
  --blue-dark:#1d4ed8;
  --green:#16a34a;
  --amber:#b7791f;
  --shadow:0 14px 38px rgba(37,55,92,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}
a{color:inherit;text-decoration:none}
button{font:inherit}
.shell{width:min(1160px,calc(100% - 36px));margin:0 auto}
.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}
.nav-row{min-height:66px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;flex-shrink:0}
.site-logo{width:260px;max-width:44vw;height:auto;display:block}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.main-nav a{padding:8px 12px;border-radius:9px;color:#40506b;font-size:14px;font-weight:750}
.main-nav a:hover,.main-nav a.active{background:var(--surface-soft);color:var(--blue)}
.mobile-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:9px;padding:7px 11px;font-weight:800}
.hero{padding:70px 0 54px;background:linear-gradient(180deg,#fff,#f7f9fc)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:54px;align-items:center}
.breadcrumb{display:inline-block;margin-bottom:16px;color:var(--blue);font-size:13px;font-weight:800}
.eyebrow{display:block;color:var(--blue);font-size:13px;font-weight:850;text-transform:uppercase;letter-spacing:.09em}
h1{margin:12px 0 18px;font-size:clamp(44px,6vw,70px);line-height:1.03;letter-spacing:-.052em}
h2{margin:6px 0 10px;font-size:clamp(30px,4vw,40px);line-height:1.1;letter-spacing:-.035em}
h3{line-height:1.25}
.lead,.section-copy{color:var(--muted)}
.lead{max-width:720px;font-size:19px}
.button,.controls button,.diagram-head button,#resetChecklist,.copy{border:1px solid var(--line);border-radius:10px;background:#fff;color:#34415b;font-weight:800;cursor:pointer}
.button{display:inline-flex;margin-top:20px;padding:12px 18px}
.button.primary,.controls .primary{background:var(--blue);border-color:var(--blue);color:#fff}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:26px}
.hero-card strong{font-size:18px}
.hero-card ol{margin:16px 0 0;padding-left:22px;color:var(--muted)}
.article-meta{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px;color:var(--muted);font-weight:700}
.article-meta span{padding:8px 10px;border:1px solid var(--line);border-radius:999px;background:#fff}
.article-shell{padding:24px 0 60px}
.article-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px;align-items:start}
.article-nav{position:sticky;top:94px}
.article-nav-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;box-shadow:var(--shadow)}
.article-nav-card h2{font-size:18px;margin:0 0 12px}
.article-nav-card nav{display:grid;gap:6px}
.article-nav-link{display:block;padding:8px 10px;border-radius:10px;color:#43526b;font-weight:700}
.article-nav-link:hover,.article-nav-link.active{background:var(--surface-soft);color:var(--blue)}
.article-body{display:grid;gap:18px}
.article-block{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow)}
.article-block h2{margin-top:0}
.article-inner{padding:24px;border-radius:16px;background:#f8fbff;border:1px solid var(--line)}
.callout{padding:14px 16px;border-radius:12px;border:1px solid var(--line);margin-top:16px;font-weight:700}
.callout.note{background:#f4f8ff;border-color:#dce8ff;color:#2f4b8c}
.callout.warning{background:#fff8e7;border-color:#f1d894;color:#7a5610}
.check-list{margin:14px 0 0;padding-left:20px;color:var(--muted)}
.check-list li{margin-bottom:8px}
.section{padding:66px 0}
.section-soft{background:#f0f5fb;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-dark{background:#111b2e;color:#f5f8fc}
.section-dark .eyebrow{color:#86a9ff}
.section-title{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:24px}
.controls{display:flex;flex-wrap:wrap;gap:8px}
.controls button,.diagram-head button,#resetChecklist{padding:10px 13px}
.diagram-card{overflow:hidden;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.diagram-head{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:17px 20px;border-bottom:1px solid var(--line)}
.diagram-head div{display:grid;gap:3px}
.diagram-head span{color:var(--muted);font-size:14px}
svg{display:block;width:100%;height:auto;background:#fbfcfe}
.switch>rect{fill:#fff;stroke:#ccd6e4;stroke-width:2;filter:drop-shadow(0 5px 7px rgba(37,55,92,.10))}
.swname{font-size:20px;font-weight:850;fill:var(--text)}
.swsub{font-size:14px;fill:var(--muted)}
.port rect{stroke-width:2}
.port text{font-size:18px;font-weight:900;text-anchor:middle;pointer-events:none}
.port1 rect{fill:#eaf2ff;stroke:#2563eb}
.port1 text{fill:#1d4ed8}
.port2 rect{fill:#ecfdf3;stroke:#16a34a}
.port2 text{fill:#15803d}
.port.highlight rect{stroke-width:5;filter:drop-shadow(0 0 8px rgba(37,99,235,.32))}
.hardware rect{fill:#f3f5f8;stroke:#d6dde7}
.hardware text{font-size:13px;font-weight:800;fill:#78869a}
.label{font-size:13px;font-weight:900;letter-spacing:.08em;fill:#526079}
.legend{font-size:13px;font-weight:800}
.legend.p1{fill:#2563eb}
.legend.p2{fill:#16a34a}
.cable{fill:none;stroke:#a8b5c5;stroke-width:8;stroke-linecap:round;opacity:.22;transition:.25s ease;stroke-dasharray:14 9}
.cable.active{opacity:1;stroke:#2563eb;filter:drop-shadow(0 0 5px rgba(37,99,235,.3));animation:flow 1.1s linear infinite}
.return-cable.active{stroke:#16a34a}
@keyframes flow{to{stroke-dashoffset:-23}}
.cable-labels text{font-size:11px;font-weight:850;fill:#6f7d91}
.connection-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
.connection-strip button{display:flex;align-items:center;gap:10px;min-height:68px;padding:12px;border:0;border-right:1px solid var(--line);background:#fff;color:#4c5a70;text-align:left;cursor:pointer}
.connection-strip button:last-child{border-right:0}
.connection-strip b{width:30px;height:30px;display:grid;place-items:center;border-radius:50%;background:#edf2f8}
.connection-strip button.active{background:#edf4ff;color:var(--blue)}
.connection-strip button.active b{background:var(--blue);color:#fff}
.step-details{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-top:18px}
.step-detail-card,.step-command-card,.expected,.step-warning{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}
.step-detail-card h3,.step-command-card h3{margin:0 0 8px;font-size:17px}
.step-command-card{grid-column:1/-1}
.command-heading{display:flex;justify-content:space-between;gap:12px;align-items:center}
.expected{grid-column:1/-1;background:#effaf4;border-color:#c8ead6;color:#17633b}
.step-warning{grid-column:1/-1;background:#fff8e7;border-color:#f1d894;color:#7a5610}
.note{color:var(--muted);font-size:13px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:22px}
.feature-card{padding:23px;background:#fff;border:1px solid var(--line);border-radius:15px;box-shadow:0 6px 20px rgba(37,55,92,.06)}
.feature-card p{color:var(--muted)}
.pill{display:inline-flex;padding:5px 8px;border-radius:999px;font-size:11px;font-weight:900}
.pill.blue{background:#eaf2ff;color:#1d4ed8}
.pill.green{background:#ecfdf3;color:#15803d}
.cable-demo{display:flex;align-items:center;gap:10px;margin:18px 0}
.cable-demo span{padding:8px 10px;border:1px solid var(--line);border-radius:8px;font:750 12px ui-monospace,SFMono-Regular,Menlo,monospace}
.cable-demo i{flex:1;height:5px;border-radius:999px;background:var(--blue)}
.cable-demo.power i{background:var(--green)}
.command-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:22px}
.command-card{position:relative;padding:20px;border:1px solid rgba(255,255,255,.12);border-radius:14px;background:#17243a}
.command-card.compact{margin-top:18px}
.command-card h3{margin-top:0}
.command-card p{color:#aebbd0}
pre{overflow:auto;margin:12px 0;padding:15px;border-radius:10px;background:#08111f;color:#dbeafe;font:700 13px/1.65 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.copy{padding:8px 11px}
.progress{height:10px;margin-top:22px;border-radius:999px;background:#dfe6ef;overflow:hidden}
#progressBar{height:100%;width:0;background:linear-gradient(90deg,var(--blue),#4f8cff);transition:width .25s ease}
#progressText{color:var(--muted);font-weight:700}
.deployment-checklist{display:grid;gap:12px}
.deployment-task{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.deployment-task summary{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:17px 18px;cursor:pointer;font-weight:850}
.deployment-task summary label{display:flex;align-items:center;gap:8px;color:var(--green);font-size:13px;white-space:nowrap}
.deployment-task summary input{width:18px;height:18px}
.task-body{padding:0 18px 18px;color:var(--muted)}
.task-body h3{color:var(--text)}
.task-body strong{color:var(--text)}
.task-body pre{background:#0c1727}
.footer{min-height:80px;display:flex;justify-content:space-between;align-items:center;gap:20px;color:#718098;font-size:13px}
footer{background:#fff;border-top:1px solid var(--line)}
#toast{position:fixed;right:18px;bottom:18px;z-index:50;padding:10px 14px;border-radius:9px;background:#172033;color:#fff;font-weight:800;opacity:0;transform:translateY(10px);pointer-events:none;transition:.2s ease}
#toast.show{opacity:1;transform:translateY(0)}
.article-nav-mobile{display:none;margin-bottom:16px}
.article-nav-mobile details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;box-shadow:var(--shadow)}
.article-nav-mobile summary{font-weight:800;cursor:pointer}
.article-nav-links{display:grid;gap:8px;margin-top:10px}
.article-nav-links a{display:block;padding:8px 10px;border-radius:10px;color:#43526b;font-weight:700}
.article-nav-links a:hover{background:var(--surface-soft);color:var(--blue)}
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .article-layout{grid-template-columns:1fr}
  .article-nav{display:none}
  .article-nav-mobile{display:block}
  .connection-strip{grid-template-columns:1fr 1fr}
  .connection-strip button:nth-child(2){border-right:0}
  .command-grid{grid-template-columns:1fr}
}
@media(max-width:680px){
  .shell{width:min(100% - 24px,1160px)}
  .main-nav{display:none}
  .mobile-toggle{display:block}
  .main-nav.open{display:flex;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:12px 18px;flex-direction:column;align-items:stretch}
  .section-title,.diagram-head{flex-direction:column;align-items:flex-start}
  .two-col,.step-details{grid-template-columns:1fr}
  .step-command-card,.expected,.step-warning{grid-column:auto}
  .connection-strip{grid-template-columns:1fr}
  .connection-strip button{border-right:0;border-bottom:1px solid var(--line)}
  .deployment-task summary{align-items:flex-start;flex-direction:column}
}