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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.scene-image{transition:none!important;transform:none!important;will-change:auto}.scroll-line:after{animation:none}.action{transition:none}.action:hover{transform:none}}

/* Readable text and controls at every viewport. */
.chapter-copy,.intro-content .chapter-copy{font-size:16px}.signs p,.field-note>div p{font-size:16px}.signs>span{font-size:12px}.action,.next-text,.field-note>div a,.header-actions,.call-link,.exit-link{font-size:14px}.field-note summary small{font-size:11px}.field-note summary{font-size:24px}.eyebrow{font-size:12px;letter-spacing:1.9px}.intro-hint{font-size:12px}.concept-note{font-size:12px}.rail-number,.rail-name{font-size:14px}.rail-label{font-size:10px}.journey-progress,.journey-progress>span:first-child{font-size:14px}.motion-toggle{font-size:14px}.journey-end a{font-size:16px}.scene-caption>span{font-size:12px}
@media(max-width:1100px){.field-note{right:11%;width:230px}.field-note>div{width:260px}.field-note summary{font-size:23px}}
@media(max-width:800px){.field-note{right:auto;width:100%;max-width:450px}.field-note>div{width:100%;max-width:430px}.chapter-rail{display:none}.journey-progress{gap:10px}.progress-divider{display:none}.motion-toggle{padding:0 8px}.concept-note{max-width:80%;font-size:12px}}
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@media(max-width:350px){.call-link{font-size:14px}.wordmark{font-size:17px}.wordmark span{font-size:5.5px}.header-actions{gap:9px}.exit-link{width:33px}.motion-toggle{padding:0 4px}.control-actions{gap:5px}.chapter{padding-left:6%;padding-right:6%}.intro-hint{font-size:10px}}

@media(min-width:801px) and (max-width:1100px){.chapter:not(.chapter--surface){display:block}.field-note,.journey-end{position:relative;top:auto;right:auto;margin-top:36px;text-align:left;width:100%;max-width:430px}.field-note>div{margin-left:0;width:100%}.journey-end{display:flex;gap:24px;align-items:center}.journey-end p{margin:0}.scene-caption{display:none}}

/* Six home systems, one continuous journey. */
.scene-image--treatment{background-image:url('/underground-treatment.webp');background-position:60% center}.scene-image--heating{background-image:url('/underground-heating.webp');background-position:60% center}.scene-image--leaks{background-image:url('/underground-leaks.webp');background-position:60% center}.chapter--treatment{--fallback-image:url('/underground-treatment.webp')}.chapter--heating{--fallback-image:url('/underground-heating.webp')}.chapter--leaks{--fallback-image:url('/underground-leaks.webp')}.chapter-rail{gap:5px}.rail-label{display:none}.rail-track{height:42px;margin-top:12px}.field-note summary>span:last-child{max-width:235px}.field-note summary{line-height:1.3}.journey-progress #chapter-title{max-width:260px;line-height:1.3}
@media(max-width:1100px){.chapter:not(.chapter--surface){display:block}.field-note{position:relative;top:auto;right:auto;margin-top:36px;text-align:left;width:100%;max-width:430px}.field-note>div{margin-left:0;width:100%}.field-note summary>span:last-child{max-width:none}}
@media(max-width:800px){.scene-image--treatment,.scene-image--heating,.scene-image--leaks{background-position:64% center}.journey-progress #chapter-title{max-width:180px;font-size:14px}.field-note{margin-top:30px}}
@media(max-height:650px) and (min-width:801px){.chapter-rail{gap:0}.rail-track{display:none}.chapter-rail>a{min-height:40px}}

/* Each system has its own light and camera language. No simulated readings. */
body{--scene-glow:#987246;--scene-accent:#e7b27c}body[data-chapter="well"]{--scene-glow:#22608b;--scene-accent:#aadbe7}body[data-chapter="treatment"]{--scene-glow:#367c68;--scene-accent:#c5e0b7}body[data-chapter="heating"]{--scene-glow:#a23c16;--scene-accent:#ffc18e}body[data-chapter="leaks"]{--scene-glow:#244761;--scene-accent:#c4d5de}body[data-chapter="sewer"]{--scene-glow:#80613c;--scene-accent:#e7c496}body[data-chapter="excavation"]{--scene-glow:#b48237;--scene-accent:#f0cb91}
.scene-stage:after{content:'';position:absolute;inset:0;pointer-events:none;background:radial-gradient(ellipse at 82% 38%,var(--scene-glow),transparent 63%);mix-blend-mode:screen;opacity:.24;transition:background 1s}.enhanced h1 em,.enhanced h2 em{color:var(--scene-accent);transition:color .7s}.scene-image{--camera-from:1.045;--camera-to:1.10;--pan-x:-.6%;animation:field-camera 20s ease-in-out infinite alternate;animation-play-state:paused}.scene-image.is-active{animation-play-state:running}.scene-image--surface{--camera-from:1.13;--camera-to:1.20;--pan-x:1%}.scene-image--well{--camera-from:1.09;--camera-to:1.045;--pan-x:-1%}.scene-image--treatment{--pan-x:.8%}.scene-image--heating{--camera-from:1.04;--camera-to:1.12;--pan-x:1%}.scene-image--leaks{--camera-from:1.11;--camera-to:1.045;--pan-x:-1%}.scene-image--excavation{--camera-from:1.10;--camera-to:1.04;--pan-x:.8%}@keyframes field-camera{from{transform:scale(var(--camera-from)) translate(0,var(--drift))}to{transform:scale(var(--camera-to)) translate(var(--pan-x),var(--drift))}}
.clue-picker{margin-top:28px;max-width:525px;border-top:1px solid #d5ad753b;padding-top:18px}.clue-picker>span{font-size:10px;letter-spacing:2px;color:#d5af7b}.clue-picker>div{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px 15px;margin-top:6px}.clue-picker a{display:flex;align-items:center;font-size:14px;line-height:1.4;padding:8px 0;border-bottom:1px solid #d5ad7530;color:#dce1d2}.clue-picker a:hover{color:#ffdbab;border-color:#ffdbab}.chapter--surface{padding-bottom:165px}.field-note[open] .hotspot{box-shadow:0 0 0 8px #e7b88614,0 0 0 17px #e7b88608,0 0 35px #e7b88618}.scene-word{letter-spacing:.015em;opacity:.85}.motion-off .scene-image{animation:none}.motion-off .scene-stage:after,.motion-off h1 em,.motion-off h2 em{transition:none}
@media(max-width:480px){.clue-picker>div{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:20px}.clue-picker{margin-top:22px}.clue-picker a{font-size:14px}.chapter--surface{padding-bottom:180px}.intro-hint{font-size:12px;flex-wrap:wrap}.chapter--surface .concept-note{bottom:115px}}
@media(prefers-reduced-motion:reduce){.scene-image{animation:none!important}.scene-stage:after,.enhanced h1 em,.enhanced h2 em{transition:none}}

/* The inspection beam follows the visitor through the hidden-leak scene. */
body[data-chapter="leaks"] .scene-stage:before{content:'';position:absolute;inset:0;z-index:2;background:radial-gradient(circle 240px at var(--beam-x,75%) var(--beam-y,48%),transparent 10%,#03100e22 55%,#03100e99 100%);pointer-events:none}.motion-off .scene-stage:before{background:none!important}@media(prefers-reduced-motion:reduce){.scene-stage:before{background:none!important}}