:root{--bg:#f3f3ef;--ink:#20211d;--muted:#70716b;--line:#d4d5ce;--accent:#d3ff5b;--blue:#476b90;--carbon:#41463c;--energy:#a09547}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7;font-size:16px}button,a{touch-action:manipulation}button{font:inherit;color:inherit;cursor:pointer}a{color:inherit;text-underline-offset:4px}button:focus-visible,a:focus-visible,summary:focus-visible,[role=button]:focus-visible{outline:3px solid #5f7b1a;outline-offset:4px}header{height:83px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:0 4%;border-bottom:1px solid var(--line)}.wordmark{text-decoration:none;font-size:25px;letter-spacing:-1.5px;font-weight:800}.wordmark span{font-weight:300;color:#86877d}.header-label{font-size:14px}.plain{border:0;background:none;font-size:14px}.plain span{margin-left:15px}main{padding:0 4%}.title-row{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;padding:35px 0 29px}.eyebrow{font-family:monospace;font-size:12px;letter-spacing:1.4px;margin:0 0 12px;color:var(--muted)}h1{font-size:clamp(30px,3.6vw,52px);font-weight:500;line-height:1.25;letter-spacing:-2px;margin:0}.intro{font-size:14px;color:var(--muted);margin:0 0 3px;line-height:1.9}.plant-shell{border:1px solid var(--line);background:#fafaf7;position:relative}.toolbar{padding:13px 18px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:10px}.filters,.view-controls{display:flex;align-items:center;gap:5px}.filters>span{font-size:12px;color:var(--muted);margin-right:10px}.filters button{font-size:14px;background:none;border:1px solid transparent;padding:6px 12px;border-radius:2px}.filters button[aria-pressed=true]{background:var(--ink);color:var(--accent)}.view-controls button{border:0;background:none;min-width:32px;height:32px;font-size:18px}.view-controls #fit{font-size:13px;padding:0 8px}.view-controls span{font-size:12px;min-width:40px;text-align:center}.viewport{overflow:auto;width:100%;max-height:80vh;scrollbar-width:thin;scrollbar-color:#b2b5a8 transparent;background:radial-gradient(circle,#d7dad1 .7px,transparent .8px) 0 0/22px 22px}#plant{display:block;width:100%;min-width:860px;height:auto;min-height:540px}#plant text{font-family:Arial,"PingFang SC",sans-serif}.map-footer{font-size:12px;color:var(--muted);display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;padding:11px 18px;border-top:1px solid var(--line)}.map-footer i{display:inline-block;width:7px;height:7px;background:var(--ink);margin-right:8px}.orientation{display:grid;grid-template-columns:repeat(3,1fr);gap:45px;padding:32px 0 42px}.orientation>div+div{border-left:1px solid var(--line);padding-left:35px}.section-no{font:12px monospace;color:var(--muted)}.orientation h2{font-size:21px;font-weight:500;letter-spacing:-.5px;margin:9px 0}.orientation p{font-size:14px;color:var(--muted);margin:0;max-width:370px}footer{border-top:1px solid var(--line);padding:20px 0 30px;font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:20px}.unit{cursor:pointer;outline:none}.unit .hit{fill:transparent;stroke:transparent;stroke-width:1.5}.unit:hover .hit{fill:#e8ebdf88;stroke:#bbc2ad}.unit.selected .hit{fill:#d3ff5b44;stroke:#879958}.unit:focus-visible .hit{stroke:#5f7b1a;stroke-width:3}.unit text{pointer-events:none}.unit .device{transition:transform .2s}.unit:hover .device{transform:translateY(-3px)}.unit-title{font-size:18px;font-weight:500}.unit-code{font-size:12px;fill:#767b6e;letter-spacing:1px}.unit-sub{font-size:13px;fill:#72796d}.pipe{fill:none;stroke:#727a69;stroke-width:2;stroke-linejoin:round}.pipe.hydrogen{stroke:#6686a1}.pipe.energy{stroke:#a09547;stroke-dasharray:5 6;stroke-width:1.5}.pipe.recycle{stroke:#8c937e;stroke-dasharray:6 6;stroke-width:1.5}.flow{fill:none;stroke:#333d2e;stroke-width:3;stroke-dasharray:4 35;animation:flow 5s linear infinite;pointer-events:none}.flow.hydrogen{stroke:#426684}.flow.energy{stroke:#8d873f;stroke-width:2}.paused .flow{animation-play-state:paused}.pipe-label{font-size:14px;fill:#686f5e;paint-order:stroke;stroke:#fafaf7;stroke-width:6px;stroke-linejoin:round}.zone-label{font-size:12px;letter-spacing:2px;fill:#9b9f93}.dim{opacity:.13}.inspector{position:fixed;right:0;top:0;bottom:0;z-index:5;width:min(430px,100vw);background:#f8f8f3;border-left:1px solid #b9bdae;box-shadow:-25px 0 80px #1b21141a;overflow:auto;padding:24px 28px}.inspector[hidden]{display:none}.panel-top{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:25px;font:12px monospace}.panel-top button,.dialog-top button{border:0;background:none;font-size:28px;line-height:1.2;width:36px;height:36px}.inspector h2{font-size:30px;line-height:1.45;font-weight:500;letter-spacing:-1px;margin:0 0 15px}.inspector #detailLead{font-size:15px;color:var(--muted)}.io{display:grid;grid-template-columns:1fr 1fr;gap:15px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:22px 0}.io small{font-size:12px;color:var(--muted)}.io p{font-size:14px;margin:5px 0 0}.inside-heading{display:flex;align-items:center;justify-content:space-between}.inside-heading h3{font-size:17px;font-weight:500}.inside-heading span{font:12px monospace;color:var(--muted)}.step-tabs{display:flex;gap:7px;margin-bottom:20px}.step-tabs button{height:5px;flex:1;padding:0;border:0;background:#dce0d2}.step-tabs button[aria-current=step]{background:#20211d}.step-body h3{font-size:20px;font-weight:500;margin:0 0 10px}.step-body p{font-size:16px;line-height:1.9}.fact{background:var(--accent);padding:14px 16px;font-size:15px;margin:20px 0}.step-controls,.route-walk{display:flex;justify-content:space-between;gap:15px;margin:20px 0}.step-controls button,.route-walk button{font-size:14px;padding:9px 12px;background:transparent;border:1px solid #bec3b1}.step-controls button:last-child{background:var(--ink);color:#fff;border-color:var(--ink)}button:disabled{opacity:.35;cursor:default}details{border-top:1px solid var(--line);font-size:14px}summary{cursor:pointer;padding:17px 0;font-size:15px}details p{margin:0 0 18px;color:#626a58}.route-walk{padding-top:16px;border-top:1px solid var(--line)}dialog{background:#f8f8f3;color:var(--ink);max-width:720px;width:90vw;max-height:85vh;overflow:auto;border:1px solid #b9bdae;padding:28px 35px}dialog::backdrop{background:#1b201aaa;backdrop-filter:blur(4px)}.dialog-top{display:flex;align-items:center;justify-content:space-between}.dialog-top h2{font-size:26px;font-weight:500}.skip{position:absolute;left:20px;top:-100px;background:#fff;z-index:10;padding:10px}.skip:focus{top:5px}@keyframes flow{to{stroke-dashoffset:-156}}@media(prefers-reduced-motion:reduce){.flow{animation:none}.unit .device{transition:none}}@media(min-width:1100px){body.detail-open .plant-shell{margin-right:330px}body.detail-open #plant{min-width:860px}body.detail-open .toolbar{flex-wrap:wrap}}@media(max-width:850px){header{height:70px}.header-label{display:none}.wordmark{font-size:21px}.title-row{display:block;padding:25px 0}.intro{margin-top:18px}.toolbar{flex-wrap:wrap;padding:10px}.filters{flex-wrap:wrap}.filters button{font-size:13px;padding:5px 9px}.view-controls{margin-left:auto}.viewport{max-height:70vh}#plant{min-width:960px}.orientation{grid-template-columns:1fr;gap:22px}.orientation>div+div{border:0;border-top:1px solid var(--line);padding:20px 0 0}.orientation p{max-width:none}.map-footer span:last-child{display:none}.inspector{width:min(430px,95vw)}footer{display:block}footer span{display:block}.title-row h1{letter-spacing:-1px}}
/* Industrial revision: steel, monochrome, and dedicated routing corridors. */
:root{--bg:#f1f2ef;--ink:#171a17;--muted:#737770;--line:#cdd0c9;--accent:#d3ff5b;--blue:#536a74;--carbon:#363d37;--energy:#8d935b}
body{background:var(--bg)}header{background:#171a17;color:#f3f4ed;height:76px;border:0}.wordmark{letter-spacing:-1.4px}.wordmark span{color:var(--accent)}.header-label{font-family:monospace;font-size:12px;letter-spacing:1.5px}.plain span{color:var(--accent)}.title-row{padding:28px 0}.title-row h1{font-weight:600;font-size:clamp(30px,3.2vw,47px)}.eyebrow{letter-spacing:2px}.plant-shell{background:#fff;border-color:#bfc4b9}.toolbar{background:#eaede6;padding:11px 18px}.filters button{border-radius:0}.viewport{background:#fff;max-height:88vh}#plant{min-width:1250px;min-height:700px}.map-footer{background:#f7f8f4}.loop-control{display:flex;align-items:center;gap:6px;font-size:13px;border-right:1px solid #c6cbc0;margin-right:8px;padding-right:12px;white-space:nowrap}.loop-control input{accent-color:#242b20;width:15px;height:15px}.unit-title{font-size:20px;font-weight:600;fill:#222821;letter-spacing:-.5px}.unit-sub{font-size:15px;fill:#737a70}.unit-code{font-size:13px;fill:#757c70;letter-spacing:1.2px}.unit .hit{fill:transparent;stroke:transparent}.unit:hover .hit{fill:#e5ebdf44;stroke:#c6cebd}.unit.selected .hit{fill:#d3ff5b15;stroke:#96a67a}.unit .device{transition:filter .2s}.unit:hover .device{transform:none;filter:contrast(1.08)}.pipe{stroke:#737d70;stroke-width:2.2}.pipe.hydrogen{stroke:#6a8490}.pipe.energy{stroke:#9c9f6c;stroke-width:1.8}.flow{stroke:#3a4637;stroke-width:3;stroke-dasharray:5 75;animation-duration:8s}.flow.hydrogen{stroke:#496c7a}.pipe-label{font-size:16px;fill:#5b6658;stroke:#fff;stroke-width:9px}.zone-label{font-size:13px;fill:#909789;letter-spacing:2px}.hidden-stream{display:none}.dim{opacity:.16}.inspector{background:#fafbf7;box-shadow:-15px 0 60px #11180e1c}.panel-top{font-size:13px}.fact{background:#e7f3cb;border-left:3px solid #81965b}.orientation{gap:35px}.orientation h2{font-weight:600}.step-controls button,.route-walk button{border-radius:0}.unit img{pointer-events:none}@media(min-width:1100px){body.detail-open .plant-shell{margin-right:0}body.detail-open #plant{min-width:1250px}body.detail-open .toolbar{flex-wrap:nowrap}.inspector{width:410px}body.detail-open .viewport{padding-right:0}}@media(max-width:900px){.toolbar{align-items:flex-start;gap:10px}.view-controls{flex-wrap:wrap}.viewport{max-height:74vh}#plant{min-width:1200px}.loop-control{font-size:12px}.inspector{width:min(410px,95vw)}.map-footer{font-size:12px}.title-row{padding:23px 0}.header-label{display:none}}

.process-explanation{font-size:15px;fill:#364b2b;font-weight:500;paint-order:stroke;stroke:#fff;stroke-width:5px}.pipe.core{stroke:#6d8653;stroke-width:2}.flow.core{stroke:#6d8653}

.energy-clearance{fill:none;stroke:#fff;stroke-width:7;stroke-linejoin:round}.pipe.energy{stroke:#8a854a;stroke-width:2;stroke-dasharray:7 5}.pipe.energy.heat{stroke:#b77548}.flow.energy.heat{stroke:#b77548}