@charset "UTF-8";
:root{--ink:#132330;--muted:#596773;--paper:#f5f7f8;--line:#d9e0e4;--dark:#101b25;--light:#d6ed91;--accent:#bcdb74;--orange:#e1a578;--mono:Consolas,"Courier New",monospace;--sans:"Segoe UI",Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.55 var(--sans)}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-underline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #397fc0;outline-offset:5px}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:500;line-height:1.1}h1{font-size:clamp(2.6rem,4.4vw,4.8rem);letter-spacing:-.052em}h1 em{font-family:Georgia,serif;font-weight:400}h2{font-size:clamp(1.75rem,2.5vw,2.7rem);letter-spacing:-.035em}h3{font-size:1.6rem;letter-spacing:-.025em}.shell{width:min(1280px,calc(100% - 96px));margin:auto}.header{display:flex;align-items:center;justify-content:space-between;padding:27px 0;border-bottom:1px solid var(--line);gap:32px}.brand{display:flex;align-items:center;gap:24px;text-decoration:none}.brand-number{font-size:3.3rem;line-height:1;font-weight:650;letter-spacing:-.07em;text-decoration:none}.brand-unit{font:12px var(--mono);letter-spacing:0;margin-left:6px}.brand-caption{font-size:12px;letter-spacing:.14em;line-height:1.45;padding-left:24px;border-left:1px solid var(--line)}nav{display:flex;gap:28px;font-size:14px}nav a{text-decoration:none}nav a:hover{text-decoration:underline}.intro{display:flex;justify-content:space-between;align-items:flex-end;padding:54px 0 42px;gap:32px}.eyebrow{font:12px/1.5 var(--mono);letter-spacing:.08em;margin-bottom:18px}.intro-note{font-size:15px;color:var(--muted);padding-bottom:7px}.intro-note a{display:block;margin-top:18px;font-size:14px}.observatory{background:var(--dark);color:#fff;padding:34px 40px 30px;border-radius:4px}.panel-top{display:flex;justify-content:space-between;gap:25px;align-items:flex-start}.panel-top .eyebrow{color:#a8b5bf;margin-bottom:10px}.panel-top h2{font-size:1.65rem;letter-spacing:-.02em}.tag{border:1px solid #45525d;border-radius:40px;padding:6px 13px;font-size:12px;color:#c3cdd5}.energy-reading{display:flex;align-items:center;justify-content:space-between;padding:22px 0 23px;gap:24px}.energy-reading output{font:500 clamp(4rem,7vw,6.5rem)/1 var(--sans);letter-spacing:-.075em;color:var(--light);font-variant-numeric:tabular-nums}.energy-reading output span{font-size:.45em;letter-spacing:-.04em;color:#91a477;margin-left:8px}.energy-reading p{font-size:13px;color:#a9b5bf;margin-top:8px}.equation{font:17px var(--mono);color:#aebdc9}.equation span{color:#fff}.scale-labels{display:flex;justify-content:space-between;font-size:13px;color:#b8c4cd;gap:20px;margin-bottom:8px}.scale-labels>:last-child{text-align:right}.eroi-range{display:block;width:100%;appearance:none;-webkit-appearance:none;height:16px;margin:18px 0;background:linear-gradient(90deg,#d6ed91 0%,#bacc89 35%,#e0c384 70%,#d69277 100%);border-radius:0;cursor:ew-resize}.eroi-range::-webkit-slider-thumb{appearance:none;width:8px;height:36px;background:#fff;border:3px solid var(--dark);outline:1px solid #fff;border-radius:0;box-shadow:0 0 0 5px #101b2533}.eroi-range::-moz-range-thumb{width:6px;height:32px;background:#fff;border:2px solid var(--dark);border-radius:0}.scale-ticks{position:relative;height:26px;color:#b8c4cd;font:13px var(--mono)}.scale-ticks span{position:absolute;left:var(--x);transform:translateX(-50%)}.scale-ticks span:first-child{transform:none}.scale-ticks span:last-child{transform:translateX(-100%)}.energy-bottom{display:flex;align-items:center;justify-content:space-between;gap:70px;border-top:1px solid #33414e;margin-top:14px;padding-top:20px}.energy-bars{flex:1;max-width:760px}.bar-caption{display:flex;justify-content:space-between;gap:16px;font-size:13px;margin-bottom:10px}.bar-caption strong{font-size:16px;margin-left:6px;font-weight:500}.bar-caption i{display:inline-block;width:8px;height:8px;margin-right:8px}.legend-net{background:var(--light)}.legend-cost{background:var(--orange)}.balance-bar{height:5px;background:var(--orange)}#net-bar{height:100%;display:block;width:95%;background:var(--light)}.small{font-size:13px;color:var(--muted)}.energy-bars .small{margin-top:8px;color:#a9b5bf}.panel-link{font-size:14px;white-space:nowrap;color:var(--light)}.section-space{margin-top:76px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:30px}.section-heading .eyebrow{color:var(--muted);margin-bottom:12px}.year-picker{display:grid;grid-template-columns:1fr auto;gap:4px 15px;font-size:14px;color:var(--muted);width:220px}.year-picker output{font:30px/1 var(--mono);letter-spacing:-.06em;color:var(--ink)}.year-picker input{grid-column:1/-1;width:100%;accent-color:var(--ink);margin-top:10px}.timeline{display:grid;grid-template-columns:repeat(5,1fr);margin:38px 0 0}.timeline button{appearance:none;border:0;border-top:2px solid var(--line);background:none;text-align:left;padding:16px 12px 18px 0;color:var(--muted);font:22px/1.3 var(--mono)}.timeline button span{display:block;font:13px var(--sans);margin-top:6px}.timeline button[aria-pressed=true]{border-color:var(--ink);color:var(--ink);font-weight:700}.timeline button:hover{background:#eaf0f3}.phase{display:grid;grid-template-columns:1fr 1fr;gap:80px;background:#e8eef1;padding:32px 36px}.phase h3{font-size:2rem;margin-bottom:17px}.phase p:not(.eyebrow){color:#4e606d;font-size:16px}.phase-actions p{border-bottom:1px solid #cbd6dc;padding:16px 0}.phase-actions p:first-child{padding-top:0}.phase-actions p:last-child{border:0;padding-bottom:0}.phase-actions span{display:block;font:12px var(--mono);letter-spacing:.07em;color:#667884;margin-bottom:6px}.phase-actions strong{font-size:16px;line-height:1.4;color:var(--ink);font-weight:500}.branch-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:36px 0 18px}.branch-heading h3{font-size:1.25rem}.branch-heading>span{font-size:13px;color:var(--muted)}.branches{display:grid;grid-template-columns:1fr 1fr;gap:0 36px}.branch{border-top:1px solid var(--line);padding:19px 0}.branch>summary{display:flex;align-items:center;gap:15px;cursor:pointer;list-style:none;font-size:18px}.branch>summary::-webkit-details-marker{display:none}.branch-code{font:13px var(--mono);color:var(--muted)}.branch>summary::after{content:"+";margin-left:auto;font:25px var(--mono);font-weight:400}.branch[open]>summary::after{content:"−"}.branch-content{padding:18px 0 0 36px;font-size:15px;color:var(--muted)}.branch-content>p{margin-bottom:16px}.branch-step{border-left:2px solid #bacbd3;padding:0 0 18px 18px}.branch-step h4{color:var(--ink);font-size:16px;margin:0 0 6px;font-weight:600}.branch-step p+p{margin-top:7px}.branch-step b{font-weight:500;color:var(--ink)}.branch details{margin-top:10px;font-size:14px}.branch details summary{cursor:pointer;color:var(--ink)}.branch details p{padding-top:8px}.section-lead{color:var(--muted);margin:18px 0 28px}.text-button{border:0;background:none;font-size:14px;color:var(--muted);padding:8px 0;text-align:right}.scenario-layout{display:grid;grid-template-columns:1.1fr 1fr;gap:56px}.quiz label{display:flex;gap:20px;padding:0 0 24px}.question-number{font:13px var(--mono);color:var(--muted);padding-top:4px}.quiz label>span:last-child{flex:1;font-size:16px}.quiz select{display:block;width:100%;min-height:48px;border:1px solid #c7d1d7;background:#fff;color:var(--ink);padding:10px 30px 10px 12px;font-size:15px;border-radius:2px;margin-top:10px}.result{position:relative;background:#e8eef1;padding:26px 30px;min-height:280px;overflow:hidden;border-top:3px solid #839aa9}.result .eyebrow{margin-bottom:30px;font-size:12px}.result h3{font-size:2rem;max-width:340px;position:relative}.result>p:not(.eyebrow){font-size:15px;max-width:350px;position:relative;margin-top:16px}.result #result-next{font-size:14px;margin-top:15px;border-top:1px solid #becbd1;padding-top:12px;position:relative}.result #result-next:empty{display:none}#result-index{position:absolute;top:10px;right:22px;font:130px/1 var(--sans);opacity:.07}.result[data-state=green]{background:#e9f0d9;border-color:#809a45}.result[data-state=amber]{background:#f0e9d9;border-color:#ae8944}.result[data-state=red]{background:#f3e6df;border-color:#b17760}.presets{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:22px}.presets button{border:1px solid var(--line);background:transparent;text-align:left;padding:18px}.presets button:hover,.presets button[aria-pressed=true]{border-color:#778d9b;background:#ecf0f2}.presets span{display:block;font-size:15px}.presets small{display:block;color:var(--muted);font-size:12px;margin-top:7px}.identity{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:45px 0;display:grid;grid-template-columns:1fr 1.15fr;align-items:center;gap:80px}.identity-mark{font:500 clamp(6rem,13vw,12rem)/1 var(--sans);letter-spacing:-.08em}.identity-mark span{font:14px var(--mono);letter-spacing:0;margin-left:10px}.identity h2{font-size:2rem;margin-bottom:18px}.identity p:not(.eyebrow){font-size:16px;color:var(--muted);max-width:520px}.identity .fusion{font-family:var(--mono);color:var(--ink)!important;margin:18px 0}.identity a{font-size:13px}.method details{padding:20px 0;border-bottom:1px solid var(--line)}.method .section-heading{margin-bottom:26px}.method summary{font-size:17px;cursor:pointer}.detail-copy{max-width:850px;padding:18px 0 0 22px;color:var(--muted);font-size:16px}.detail-copy p+p{margin-top:14px}.detail-copy a{color:var(--ink)}.detail-copy ul{padding-left:18px}.detail-copy li{margin-bottom:12px}.footer{margin-top:64px;padding:28px 0 34px;display:flex;align-items:center;gap:25px;border-top:1px solid var(--line)}.footer .brand-number{font-size:2.3rem}.footer p{font-size:13px}.footer p span{color:var(--muted);font-size:12px}.footer>a:last-child{font-size:13px;margin-left:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:absolute;top:-100px;left:20px;padding:12px;background:white;z-index:100}.skip:focus{top:12px}
@media(min-width:1550px){.shell{max-width:1340px}.intro{padding-top:64px;padding-bottom:50px}}
@media(max-width:1000px){.shell{width:calc(100% - 48px)}nav{gap:18px}.brand-caption{display:none}.intro-note{max-width:210px}.observatory{padding:28px}.energy-bottom{gap:30px}.phase{gap:35px}.scenario-layout{gap:30px}.identity{gap:35px}.equation{font-size:15px}.tag{font-size:12px}.presets button{padding:13px}.intro{padding-top:42px}}
@media(max-width:680px){body{font-size:16px}.shell{width:calc(100% - 36px)}.header{padding:18px 0;gap:20px;flex-wrap:wrap}.brand-number{font-size:2.5rem}.brand-unit{font-size:12px}.header nav{gap:20px;width:100%;overflow:auto;white-space:nowrap;font-size:13px;padding-bottom:2px}.intro{padding:32px 0 26px;display:block}.intro .eyebrow{font-size:12px;letter-spacing:.025em}.intro h1{font-size:2.65rem;letter-spacing:-.05em}.intro-note{display:flex;justify-content:space-between;max-width:none;align-items:center;margin-top:21px;font-size:13px;gap:10px}.intro-note a{margin:0;font-size:12px;white-space:nowrap}.observatory{padding:23px 20px}.panel-top h2{font-size:1.35rem}.panel-top .eyebrow{font-size:12px}.tag{display:none}.energy-reading{padding:24px 0;align-items:flex-end}.energy-reading output{font-size:4.6rem}.energy-reading p{font-size:12px}.equation{font-size:12px;max-width:125px;line-height:1.8}.equation span{display:block}.scale-labels{font-size:12px;gap:25px}.scale-labels>:last-child{max-width:150px}.scale-ticks{font-size:12px}.energy-bottom{display:block;margin-top:9px}.bar-caption{font-size:12px;gap:8px}.bar-caption strong{font-size:14px;margin-left:2px}.bar-caption i{margin-right:4px;width:6px;height:6px}.energy-bars .small{font-size:12px}.panel-link{display:inline-block;margin-top:17px;font-size:13px}.section-space{margin-top:48px}.section-heading{align-items:flex-start;flex-wrap:wrap;gap:20px}.section-heading h2{font-size:1.85rem}.year-picker{width:100%;grid-template-columns:auto 1fr auto;align-items:center}.year-picker output{grid-column:3;grid-row:1;font-size:26px}.year-picker input{grid-column:2;grid-row:1;margin:0}.eyebrow{font-size:12px}.timeline{margin-top:24px}.timeline button{font-size:16px;padding:12px 4px 14px 0}.timeline button span{font-size:12px;line-height:1.3;overflow-wrap:anywhere}.phase{grid-template-columns:1fr;padding:24px;gap:24px}.phase h3{font-size:1.8rem}.phase .eyebrow{margin-bottom:12px}.phase p:not(.eyebrow){font-size:15px}.phase-actions strong{font-size:15px}.branch-heading{align-items:flex-start}.branch-heading>span{display:none}.branches{grid-template-columns:1fr}.branch{padding:17px 0}.branch>summary{font-size:17px}.branch-content{padding-left:28px}.scenario-layout{grid-template-columns:1fr;gap:8px}.text-button{font-size:13px}.section-lead{font-size:15px}.quiz label{gap:12px}.quiz select{font-size:14px}.result{min-height:255px}.result h3{font-size:1.8rem}.presets{grid-template-columns:1fr;gap:9px}.presets button{padding:14px 18px}.presets small{margin-top:3px}.identity{grid-template-columns:1fr;padding:30px 0;gap:28px}.identity-mark{font-size:7.5rem}.identity h2{font-size:1.7rem}.identity .fusion{font-size:14px}.method summary{font-size:16px}.detail-copy{font-size:15px;padding-left:0}.method .section-heading{margin-bottom:13px}.footer{margin-top:42px;gap:16px}.footer>a:last-child{font-size:12px}.footer p{font-size:12px}.footer p span{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

.branch .leaf{border-top:1px solid var(--line);padding:13px 0;margin:0}.branch .leaf:first-child{border-top:0;padding-top:0}.branch .leaf summary{font-size:15px;font-weight:500;line-height:1.45}.branch .leaf p{font-size:14px;line-height:1.6}.branch .leaf b{font-weight:600;color:var(--ink)}.branch .leaf .leaf-period{font:12px var(--mono);color:#657a87;padding-top:14px}.branch-sources{font-size:12px;line-height:1.8;padding-top:18px}.branch-sources a{color:#3e6075}.branches>.branch:last-child{grid-column:1/-1}

.branch .leaf p{font-size:16px}.detail-copy{font-size:16px}.branch .leaf .leaf-period{font-size:12px}@media(max-width:680px){.header nav{font-size:14px;gap:16px}.intro-note{font-size:14px}.phase p:not(.eyebrow){font-size:16px}.quiz select{font-size:16px}.detail-copy{font-size:16px}.branch .leaf summary{font-size:16px}}