:root{--ink:#0b2026;--stone:#f3f0e7;--paper:#fbfaf6;--slate:#536469;--line:#cad2cf;--lime:#c7f63b;--teal:#007a76;--cool:#98ddd9;--heat:#ffad94;--display:'IBM Plex Sans Condensed','Arial Narrow',sans-serif;--body:'IBM Plex Sans',Arial,sans-serif;--mono:'IBM Plex Mono',monospace;--max:1180px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--stone);color:var(--ink);font-family:var(--body);font-size:1rem;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button,summary{cursor:pointer}img{display:block;max-width:100%;height:auto}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:var(--display);font-weight:600;line-height:1.08;letter-spacing:-.025em}h2{font-size:clamp(2.5rem,4.25vw,3.6rem)}h3{font-size:1.75rem}a,button,input,summary{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid #ba871f;outline-offset:5px}section[id],div[id],details[id]{scroll-margin-top:170px}[hidden]{display:none!important}.container{width:min(calc(100% - 80px),var(--max));margin-inline:auto}.eyebrow{font:500 .75rem/1.5 var(--mono);letter-spacing:.11em;text-transform:uppercase}.section{padding:100px 0}.section-heading{display:grid;grid-template-columns:1.05fr .95fr;gap:80px;align-items:end;margin-bottom:46px}.section-heading h2{margin-top:18px}.section-heading>p{color:var(--slate);font-size:1.06rem;max-width:510px}.text-link{display:inline-flex;align-items:center;gap:16px;font-size:.875rem;font-weight:600;border-bottom:1px solid currentColor;padding-bottom:4px}.text-link:hover{color:var(--teal)}.text-link .arrow{font-size:1.25rem;line-height:1}.skip-link{position:fixed;top:12px;left:12px;z-index:100;background:var(--lime);padding:12px 18px;transform:translateY(-160%)}.skip-link:focus{transform:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:52px;padding:13px 22px;font-size:.875rem;font-weight:600}.btn-primary{background:var(--teal);color:#fff}.btn-primary:hover{background:#006763}.btn-lime{background:var(--lime);color:var(--ink)}.btn-lime:hover{background:#d5fa63}

/* The existing site navigation remains shared with Home and Assessment. */
.site-header{position:sticky;top:0;z-index:50;height:84px;background:rgba(243,240,231,.97);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.nav-shell{height:100%;display:flex;align-items:center;gap:34px}.brand{display:flex;align-items:center;gap:9px;white-space:nowrap}.brand__mark{width:34px;height:34px;flex:0 0 34px}.brand__wordmark{width:clamp(100px,9.2vw,112px);height:auto;flex:none}.main-nav{display:flex;align-items:center;gap:28px;margin-left:auto}.main-nav a{position:relative;display:inline-flex;align-items:center;min-height:84px;font-size:.8125rem;font-weight:500;white-space:nowrap;color:var(--slate)}.main-nav a:after{content:'';position:absolute;bottom:-1px;left:0;right:100%;height:2px;background:var(--teal)}.main-nav a:hover,.main-nav a[aria-current=page]{color:var(--ink)}.main-nav a:hover:after,.main-nav a[aria-current=page]:after{right:0}.nav-actions{display:flex;align-items:center;gap:12px}.nav-cta{min-height:44px;white-space:nowrap;padding-inline:17px}.nav-mobile-cta{display:none!important}.nav-toggle{display:none;border:1px solid var(--line);width:44px;height:44px;background:transparent}.nav-toggle span{display:block;width:18px;height:2px;margin:4px auto;background:var(--ink)}

/* An engineering introduction, with an original manufacturer image. */
.hero-intro{background:var(--ink);color:var(--paper)}.breadcrumb{display:flex;align-items:center;gap:12px;padding-top:26px;font-size:.75rem;color:#b0c0c1}.breadcrumb a:hover{color:var(--lime)}.breadcrumb [aria-hidden]{color:#627c80}.hero{padding:46px 0 62px}.hero-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:62px;align-items:center}.hero .eyebrow{color:#a3c0c1}.hero h1{font-size:clamp(3rem,5.6vw,4.7rem);line-height:1.02;margin-top:23px;max-width:640px}.hero h1 span{color:var(--lime)}.hero-copy>p{max-width:560px;color:#c3cfce;margin-top:24px;font-size:1.0625rem;line-height:1.7}.hero-actions{display:flex;align-items:center;gap:28px;flex-wrap:wrap;margin-top:30px}.hero-actions .text-link:hover{color:var(--lime)}.specimen{margin:0;align-self:stretch;display:flex;flex-direction:column;justify-content:center;border-left:1px solid #31484c;padding-left:36px}.specimen-label{display:flex;justify-content:space-between;gap:16px;color:#a0b9bb;font:500 .75rem/1.5 var(--mono);letter-spacing:.06em;text-transform:uppercase}.specimen img{width:100%;aspect-ratio:1.5;object-fit:contain;margin:12px 0 18px}.specimen figcaption{border-top:1px solid #31484c;padding-top:16px;display:flex;align-items:start;gap:18px}.specimen figcaption span:first-child{width:28px;height:28px;display:grid;place-items:center;border:1px solid #6d8385;font:.75rem var(--mono);flex:0 0 28px}.specimen strong{font-size:.9375rem;font-weight:500;display:block}.specimen small{color:#a1b6b8;font-size:.75rem;display:block;margin-top:3px}.section-nav{position:sticky;top:84px;z-index:40;background:var(--stone);border-bottom:1px solid var(--line)}.section-nav .container{display:flex;align-items:stretch;justify-content:space-between;gap:24px}.section-nav a{display:flex;align-items:center;gap:12px;min-height:66px;font-size:.875rem;white-space:nowrap}.section-nav a:hover{color:var(--teal)}.section-nav a span{font:.75rem var(--mono);color:var(--teal)}

/* Both room demands are shown together; the loop setting changes the mechanism. */
.operating{background:var(--paper)}.operating .section-heading{grid-template-columns:1fr 1fr}.operating .eyebrow{color:var(--teal)}.operating-intro{margin-top:22px;color:var(--slate);max-width:460px}.logic-board{background:var(--ink);color:#fff;border:1px solid #31484c;padding:32px 38px 28px}.logic-toolbar{display:flex;justify-content:space-between;align-items:center;gap:30px}.logic-toolbar>div .eyebrow{color:#b2c3c3}.logic-toolbar>div p{margin-top:5px;font-size:.875rem;color:#b8c8c8}.loop-selector{border:0;padding:0;margin:0;display:flex;gap:0;flex-shrink:0}.loop-selector legend{font-size:.75rem;color:#b8c8c8;margin-bottom:7px}.loop-option{position:relative;display:block}.loop-option input{position:absolute;inset:0;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}.loop-option span{display:block;padding:11px 18px;border:1px solid #647d7f;font-size:.875rem}.loop-option+.loop-option span{border-left:0}.loop-option input:checked+span{background:var(--lime);border-color:var(--lime);color:var(--ink);font-weight:600}.loop-option input:focus-visible+span{outline:3px solid #fff;outline-offset:4px}.loop-selector:disabled .loop-option input{cursor:default}.loop-selector:disabled .loop-option span{opacity:.72}.loop-header{display:flex;align-items:center;justify-content:center;gap:14px;padding:30px 0 26px;font-size:.875rem}.loop-indicator{width:8px;height:8px;background:var(--cool);border-radius:50%}.logic-board[data-loop=hot] .loop-indicator{background:var(--heat)}.distribution{position:relative;margin:0 19%;height:29px;border-top:2px solid #829496;border-inline:2px solid #829496}.distribution:before{content:'';position:absolute;left:50%;top:-13px;height:11px;border-left:2px solid #829496}.distribution:after{content:'';position:absolute;top:7px;left:8px;right:8px;height:20px;border-top:1px solid #829496;border-inline:1px solid #829496}.rooms{display:grid;grid-template-columns:1fr 1fr;gap:24px}.room{padding:25px 26px 23px;background:#17343b;border-top:3px solid var(--cool);position:relative}.room--heat{border-top-color:var(--heat)}.room-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.room-head>span{font:.75rem var(--mono);letter-spacing:.08em;color:#b2c3c4}.demand{font-size:.875rem;font-weight:600;color:var(--cool)}.room--heat .demand{color:var(--heat)}.room h3{font-size:2rem;margin-top:22px}.room p{font-size:.9375rem;color:#c3cfce;margin-top:12px;min-height:72px}.room-footer{margin-top:22px;border-top:1px solid #3a5358;padding-top:13px;display:flex;align-items:center;gap:9px;font-size:.75rem;color:#bfcece}.room-footer span:first-child{width:5px;height:5px;background:currentColor}.logic-caption{display:flex;justify-content:space-between;gap:32px;padding-top:23px;color:#bbcecd;font-size:.8125rem}.logic-caption strong{color:var(--lime);font-weight:500}.logic-footnote{display:flex;justify-content:space-between;gap:40px;margin-top:20px;align-items:start}.logic-footnote p{font-size:.8125rem;color:var(--slate);max-width:780px}.logic-footnote a{white-space:nowrap;font-size:.8125rem;color:var(--teal);text-decoration:underline;text-underline-offset:4px}.noscript-note{color:#b8c8c8;font-size:.875rem;margin-top:16px}

/* Retained infrastructure has the visual emphasis; design decisions stay compact. */
.scope{background:var(--stone)}.scope-statement{display:grid;grid-template-columns:1.15fr .85fr;gap:90px;align-items:end}.scope .eyebrow{color:var(--teal)}.scope h2{margin-top:18px}.scope h2 span{display:block;color:var(--teal);margin-top:6px}.scope-statement>p{color:var(--slate);font-size:1.0625rem}.retention{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line);margin:42px 0 64px}.retention-item{padding:26px 28px 27px 0}.retention-item+.retention-item{border-left:1px solid var(--line);padding-left:28px}.retention-item .eyebrow{font-size:.75rem}.retention-item h3{font-size:1.55rem;margin-top:13px}.retention-item p{color:var(--slate);font-size:.875rem;margin-top:10px;max-width:300px}.scope-workspace{display:grid;grid-template-columns:.8fr 1.2fr;gap:80px}.scope-intro h3{font-size:2.2rem;margin-bottom:18px}.scope-intro p{color:var(--slate);font-size:.9375rem;max-width:340px}.scope-intro .scope-rule{margin-top:26px;padding-left:17px;border-left:3px solid var(--teal);font-size:.875rem}.scope-rule strong{display:block;color:var(--ink);font-weight:600}.scope-rule span{display:block;margin-top:5px}.scope-details{border-top:1px solid var(--line)}.scope-details details{border-bottom:1px solid var(--line)}.scope-details summary{list-style:none;display:flex;align-items:center;gap:20px;min-height:78px;padding:18px 0;font-size:1rem;font-weight:500}.scope-details summary::-webkit-details-marker{display:none}.scope-details summary .detail-number{font:.75rem var(--mono);color:var(--teal)}.scope-details summary:after{content:'+';margin-left:auto;font:400 1.7rem var(--body);line-height:1;color:var(--teal)}.scope-details details[open] summary:after{content:'−'}.scope-details summary:hover{color:var(--teal)}.detail-copy{padding:0 30px 24px 40px;color:var(--slate);font-size:.9375rem}.detail-copy ul{padding-left:18px;margin:0}.detail-copy li+li{margin-top:8px}.detail-output{margin-top:17px;padding-top:14px;border-top:1px solid var(--line);font-size:.8125rem}.detail-output strong{color:var(--ink)}

/* Four coordinated layers, presented as one continuous package. */
.package{background:var(--ink);color:#fff}.package .eyebrow{color:var(--lime)}.package .section-heading{grid-template-columns:1.05fr .95fr}.package .section-heading>p{color:#c3cfce}.package-chain{display:grid;grid-template-columns:repeat(4,1fr);margin-top:58px;border-top:1px solid #586d70}.package-stage{position:relative;padding:35px 25px 5px 0}.package-stage+.package-stage{padding-left:25px;border-left:1px solid #314a4f}.package-stage:before{content:'';position:absolute;left:0;top:-5px;width:9px;height:9px;background:var(--lime)}.package-stage+.package-stage:before{left:25px}.package-stage .eyebrow{min-height:36px;font-size:.75rem;color:#a8bfc0}.package-stage h3{font-size:1.8rem;margin-top:17px}.package-stage p{font-size:.9375rem;color:#b5c8c9;margin-top:14px}.package-coordination{margin-top:55px;padding-top:28px;border-top:1px solid #314a4f;display:grid;grid-template-columns:.7fr 1.3fr;gap:64px}.package-coordination h3{font-size:1.5rem}.package-coordination>div{display:grid;grid-template-columns:1fr 1fr;gap:18px 32px}.package-coordination p{font-size:.875rem;color:#b5c8c9}.package-coordination strong{display:block;color:#fff;font-weight:500;margin-bottom:5px}.package-note{font-size:.8125rem;color:#a8bfc0;border-left:2px solid #829496;padding-left:15px;margin-top:28px;max-width:980px}

.resources{background:var(--paper)}.resources .eyebrow{color:var(--teal)}.resources-list{border-top:1px solid var(--line)}.resource-row{display:grid;grid-template-columns:120px 1fr auto;gap:30px;align-items:center;padding:27px 0;border-bottom:1px solid var(--line)}.resource-type{font:500 .75rem/1.6 var(--mono);letter-spacing:.04em;color:var(--slate);text-transform:uppercase}.resource-type span{display:block;color:var(--teal);font-size:.75rem;margin-bottom:2px}.resource-row h3{font-size:1.5rem}.resource-row p{font-size:.875rem;color:var(--slate);margin-top:6px;max-width:690px}.resource-row>a{font-size:.875rem;font-weight:500;white-space:nowrap;display:flex;align-items:center;gap:17px;min-height:44px}.resource-row>a:hover{color:var(--teal)}.resource-row>a span{font-size:1.25rem}.model-resources{border-bottom:1px solid var(--line)}.model-resources summary{display:flex;align-items:center;gap:12px;list-style:none;padding:25px 0;font-size:.9375rem;font-weight:500}.model-resources summary::-webkit-details-marker{display:none}.model-resources summary:after{content:'+';margin-left:auto;font-size:1.5rem;color:var(--teal)}.model-resources[open] summary:after{content:'−'}.model-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;padding-bottom:28px}.model-links a{display:block;border-left:2px solid var(--line);padding:4px 0 4px 18px;font-weight:500;font-size:.9375rem}.model-links a:hover{border-color:var(--teal);color:var(--teal)}.model-links span{display:block;font-size:.8125rem;color:var(--slate);font-weight:400;margin-top:7px}.resource-note{font-size:.8125rem;color:var(--slate);margin-top:22px;max-width:900px}

.next-step{background:var(--stone);padding:78px 0 84px;border-top:1px solid var(--line)}.next-layout{display:grid;grid-template-columns:1fr .8fr;gap:100px;align-items:start}.next-step h2{margin-top:18px}.next-step p{color:var(--slate);max-width:580px;margin-top:22px;font-size:1rem}.next-step .btn{margin-top:28px}.bring-list{margin:0;padding:0;list-style:none;border-top:1px solid var(--line)}.bring-list li{padding:17px 0;border-bottom:1px solid var(--line);font-size:.9375rem;display:flex;gap:18px}.bring-list li span{font:.75rem var(--mono);padding-top:5px;color:var(--teal)}.next-aside>.eyebrow{margin-bottom:17px;color:var(--teal)}.next-aside>p{font-size:.8125rem;margin-top:17px}.site-footer{background:var(--ink);color:#fff;padding:48px 0 28px}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:60px}.footer-brand .brand{filter:brightness(0) invert(1);width:max-content}.footer-brand p{max-width:340px;color:#a8bfc0;font-size:.875rem;margin-top:18px}.footer-col{display:flex;flex-direction:column;align-items:start;gap:10px;font-size:.875rem}.footer-col strong{font:.75rem var(--mono);letter-spacing:.08em;color:#c7f63b;text-transform:uppercase;margin-bottom:4px}.footer-col a{color:#bdcece}.footer-col a:hover{color:#fff}.footer-bottom{border-top:1px solid #314a4f;margin-top:36px;padding-top:20px;display:flex;justify-content:space-between;gap:24px;color:#a8bfc0;font-size:.75rem}

@media(min-width:1500px){.hero h1{font-size:4.7rem}}
@media(max-width:1100px){.main-nav{gap:18px}.nav-shell{gap:24px}.section-heading,.scope-statement{gap:48px}.hero-layout{gap:40px}.specimen{padding-left:26px}.hero h1{font-size:4rem}.scope-workspace{gap:50px}.next-layout{gap:60px}}
@media(max-width:980px){.container{width:calc(100% - 48px)}.main-nav{display:none;position:absolute;top:84px;left:0;right:0;background:var(--stone);padding:12px 24px 22px;flex-direction:column;align-items:stretch;gap:0;border-bottom:1px solid var(--line)}.main-nav.open{display:flex}.main-nav a{min-height:48px;padding:12px 0;border-bottom:1px solid var(--line);font-size:.9375rem}.main-nav a:after{display:none}.main-nav .nav-mobile-cta{display:inline-flex!important;color:#fff;min-height:48px;margin-top:14px;padding:12px 18px}.nav-actions{margin-left:auto}.nav-actions>.nav-cta{display:none}.nav-toggle{display:block}.hero-layout{grid-template-columns:1.1fr .9fr;gap:28px}.hero h1{font-size:3.55rem}.hero-copy>p{font-size:1rem}.specimen{padding-left:24px}.hero-actions{gap:20px}.section-nav .container{gap:20px}.section-nav a{font-size:.8125rem;gap:8px}.logic-board{padding:28px}.scope-workspace{grid-template-columns:.7fr 1.3fr;gap:40px}.package-stage{padding-right:18px}.package-stage+.package-stage{padding-left:18px}.package-stage h3{font-size:1.55rem}.package-stage+.package-stage:before{left:18px}.package-coordination{gap:40px}.footer-grid{gap:40px}.resource-row{grid-template-columns:100px 1fr auto;gap:20px}}
@media(max-width:760px){.section{padding:72px 0}.hero{padding:35px 0 45px}.hero-layout{grid-template-columns:1fr;gap:35px}.hero h1{font-size:clamp(3.2rem,9vw,4.5rem);max-width:640px}.hero-copy>p{max-width:600px}.specimen{border-left:0;border-top:1px solid #31484c;padding:25px 0 0;display:grid;grid-template-columns:1fr 1fr;align-items:center;column-gap:22px}.specimen-label{grid-column:1/-1}.specimen img{margin:8px 0 0;max-height:200px}.specimen figcaption{border:0;padding:0}.section-nav .container{overflow:auto;justify-content:start;scrollbar-width:thin;gap:28px}.section-nav a{min-height:60px}.section-heading,.operating .section-heading,.package .section-heading,.scope-statement{grid-template-columns:1fr;gap:22px}.section-heading{margin-bottom:32px}.section-heading>p{max-width:600px}.logic-toolbar{align-items:start}.loop-selector{flex-wrap:nowrap}.logic-board{padding:25px 24px}.loop-option span{padding:10px 13px}.logic-toolbar>div p{max-width:200px}.room{padding:20px}.room-head{align-items:start;flex-direction:column;gap:5px}.room h3{font-size:1.75rem;margin-top:18px}.room p{min-height:116px}.logic-caption{flex-direction:column;gap:5px}.logic-footnote{flex-direction:column;gap:14px}.scope-workspace{grid-template-columns:1fr;gap:35px}.scope-intro p{max-width:580px}.scope-intro .scope-rule{margin-top:19px}.retention{margin:32px 0 42px}.retention-item{padding-right:16px}.retention-item+.retention-item{padding-left:16px}.retention-item h3{font-size:1.35rem}.package-chain{grid-template-columns:1fr 1fr;margin-top:42px}.package-stage{padding:30px 25px 28px 0}.package-stage:nth-child(3){border-left:0;border-top:1px solid #586d70;padding-left:0}.package-stage:nth-child(4){border-top:1px solid #586d70}.package-stage:nth-child(3):before{left:0}.package-stage h3{font-size:1.8rem}.package-coordination{grid-template-columns:1fr;gap:23px;margin-top:17px}.resource-row{grid-template-columns:85px 1fr;gap:10px 18px}.resource-row>a{grid-column:2;width:max-content}.model-links{gap:18px}.next-step{padding:65px 0}.next-layout{grid-template-columns:1fr;gap:38px}.footer-grid{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}.footer-brand p{max-width:450px}.footer-bottom{flex-direction:column;gap:12px}}
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