:root{color-scheme:light;--filter-body:#25453b;--filter-edge:#152c25;--on-forest:#fff;--body-text:#4e5c4e;--soft:#eef1e8;--line-soft:#e5e7dc;--line-strong:#b9c9bb;--marker:#7d8c75;--draft-rule:#b9a376;--tag-text:#6d4f1d;--tag-bg:#f3ead3;--tag-line:#e0cf9f;--note-bg:#eef4f3;--note-line:#cadeda;--pipe-idle:#56625b;--open-text:#1f6b3a;--closed-text:#9a2f20;--sea-text:#3d4b80;--sea-soft:#dbe4f5;--pipe-cabin:#254e40;--pipe-fire:#333b35;--grid-dot:#e6e9df;--moon-display:block;--sun-display:none;--paper:#f7f6f0;--white:#fffef9;--ink:#203c34;--muted:#626b62;--line:#d9ddd2;--forest:#254e40;--green:#456c59;--water:#397b8b;--rust:#a84935;--amber:#876326;--pale:#edf0e5;--selected:#e4eee2;--font:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
    *{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.55}button{font:inherit}a{color:var(--forest);text-underline-offset:4px}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible{outline:3px solid var(--water);outline-offset:4px}[hidden]{display:none!important}.wrap{max-width:1304px;margin:0 auto;padding:0 44px}.masthead{display:flex;justify-content:space-between;align-items:center;padding-top:25px;padding-bottom:24px;border-bottom:1px solid var(--line);font-size:13px}.brand{display:flex;align-items:center;gap:12px;font-weight:750;letter-spacing:2.2px;text-transform:uppercase}.brand-mark{width:26px;height:26px}.masthead nav{display:flex;gap:25px}.masthead a{text-decoration:none}.hero{display:grid;grid-template-columns:1fr 310px;gap:40px;align-items:end;padding:53px 0 36px}.eyebrow{font-size:11px;font-weight:750;letter-spacing:1.8px;text-transform:uppercase;color:var(--green);margin:0 0 13px}h1{font:400 clamp(38px,5vw,62px)/1.06 Georgia,"Times New Roman",serif;letter-spacing:-1.8px;margin:0 0 18px}h2{font:400 30px/1.2 Georgia,"Times New Roman",serif;letter-spacing:-.6px;margin:0}h3{font-size:18px;line-height:1.35;margin:0 0 12px}p{margin:0 0 14px}.intro{font-size:17px;color:var(--muted);max-width:650px;margin:0}.draft{border-left:2px solid var(--draft-rule);padding:2px 0 2px 19px}.draft strong{font-size:12px;text-transform:uppercase;letter-spacing:1.2px}.draft p{font-size:13px;color:var(--muted);margin:7px 0 0}.system{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:20px 0 21px;margin-bottom:42px}.system-label{font-size:11px;letter-spacing:1.5px;text-transform:uppercase;font-weight:700;margin-bottom:16px;color:var(--muted)}.flow{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:28px}.flow li{position:relative;display:flex;gap:13px;align-items:center}.flow li:not(:last-child)::after{content:'→';position:absolute;right:-16px;color:var(--marker);font-size:22px}.step{width:35px;height:35px;border-radius:50%;border:1px solid var(--line-strong);display:grid;place-items:center;font:400 16px Georgia,serif;flex-shrink:0}.flow strong{font-size:15px;font-weight:650;display:block}.flow small{display:block;color:var(--muted);font-size:12px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:24px;margin-bottom:20px}.section-head p{margin:8px 0 0;color:var(--muted);font-size:14px}.key{display:flex;flex-wrap:wrap;gap:17px;font-size:11px;color:var(--muted);padding-bottom:3px}.key span{display:flex;gap:7px;align-items:center}.key i{width:22px;height:0;border-top:3px solid var(--forest)}.key .junction{width:8px;height:8px;background:var(--forest);border:0;border-radius:50%}.key .valve{width:12px;height:12px;border:2px solid var(--rust);transform:rotate(45deg)}.diagram-layout{display:grid;grid-template-columns:minmax(0,1fr) 274px;align-items:start;gap:22px}.diagram-layout>div{min-width:0}.map-frame{background:var(--white);border:1px solid var(--line);border-radius:12px;overflow:hidden}.map-scroll{overflow-x:auto;overscroll-behavior-x:contain;padding:6px 8px 0;scrollbar-color:var(--line-strong) transparent}.manifold{display:block;width:100%;min-width:800px;height:auto}.manifold text{font-family:var(--font);fill:var(--ink);font-size:17px}.manifold .small{font-size:16px;fill:var(--muted)}.manifold .mini{font-size:16px;fill:var(--muted)}.manifold .pipe{stroke:var(--forest);stroke-width:7;fill:none;stroke-linecap:round;stroke-linejoin:round}.manifold .external{stroke-width:5}.manifold .node{fill:var(--forest)}.manifold .port{fill:var(--white);stroke:var(--forest);stroke-width:3}.manifold .valve-shape{fill:var(--white);stroke:var(--rust);stroke-width:2.5}.manifold .valve-label{fill:var(--rust);font-size:16px;font-weight:600}.manifold .lane{fill:transparent;stroke:none;transition:fill .18s}.manifold [data-branch].is-selected .lane{fill:var(--selected)}.manifold .id-circle{fill:var(--white);stroke:var(--line-strong);stroke-width:1.5}.manifold .id-letter{fill:var(--forest);font-size:19px;font-weight:650;text-anchor:middle}.manifold [data-branch].is-selected .id-circle{fill:var(--forest);stroke:var(--forest)}.manifold [data-branch].is-selected .id-letter{fill:var(--on-forest)}.map-note{padding:9px 20px 17px;font-size:12px;color:var(--muted);margin:0}.selection{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:22px}.selection .eyebrow{font-size:10px;margin-bottom:12px}.detail-id{display:flex;align-items:center;gap:10px;font-size:12px;font-weight:650;letter-spacing:1px;text-transform:uppercase;color:var(--green);margin-bottom:12px}.detail-dot{height:25px;width:25px;border-radius:50%;display:grid;place-items:center;background:var(--forest);color:var(--on-forest);letter-spacing:0}.selection h3{font:400 25px/1.14 Georgia,serif;margin-bottom:14px}.selection p{font-size:13px;line-height:1.6;color:var(--body-text)}.selection dl{margin:18px 0 0;border-top:1px solid var(--line-strong);padding-top:14px}.selection dt{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--muted);font-weight:700;margin-top:12px}.selection dd{font-size:13px;margin:4px 0 0}.selection .unknown{color:var(--tag-text)}.questions{display:grid;grid-template-columns:1fr 1.4fr;gap:60px;border-top:1px solid var(--line);padding:32px 0 41px}.questions p{font-size:14px;color:var(--muted);margin:12px 0 0;max-width:370px}.questions ol{padding-left:22px;margin:1px 0 0}.questions li{font-size:14px;padding:0 0 13px 5px;color:var(--body-text)}.questions li::marker{font-family:Georgia,serif;color:var(--marker)}.questions strong{color:var(--ink);font-weight:600}.footer{display:flex;gap:30px;justify-content:space-between;border-top:1px solid var(--line);padding:22px 0 29px;font-size:11px;color:var(--muted)}.mobile-hint{display:none}.no-script{padding:14px 18px;background:var(--tag-bg);color:var(--tag-text);font-size:13px}
    @media(min-width:1450px){.wrap{max-width:1390px}.diagram-layout{grid-template-columns:minmax(0,1fr) 295px}}
    @media(max-width:1180px){.wrap{padding:0 28px}.diagram-layout{grid-template-columns:minmax(0,1fr)}.selection{display:grid;grid-template-columns:190px 1fr;gap:0 25px}.selection .detail-body{grid-column:2}.selection dl{display:grid;grid-template-columns:105px 1fr;gap:10px;margin-top:14px}.selection dt,.selection dd{margin:0}.section-head{align-items:start}.key{max-width:240px;justify-content:flex-end;gap:10px 15px}}
    @media(max-width:720px){.wrap{padding:0 20px}.masthead{padding-top:20px;padding-bottom:18px}.masthead nav{gap:16px;font-size:12px}.brand{font-size:12px}.hero{grid-template-columns:1fr;gap:24px;padding-top:34px;padding-bottom:26px}h1{font-size:43px}.intro{font-size:15px}.draft{max-width:440px}.flow{grid-template-columns:1fr 1fr;gap:21px 24px}.flow li:nth-child(2)::after{display:none}.system{margin-bottom:30px}.system-label{font-size:10px}.flow strong{font-size:14px}.flow small{font-size:11px}.section-head{display:block}.key{justify-content:flex-start;max-width:none;margin-top:15px;font-size:10px;gap:12px}.section-head h2{font-size:28px}.mobile-hint{display:block;margin:5px 0 0;font-size:11px;color:var(--muted)}.selection{display:block;padding:20px}.selection .detail-body{min-height:170px}.selection h3{font-size:26px}.selection p{font-size:14px}.selection dl{display:grid;grid-template-columns:95px 1fr}.questions{grid-template-columns:1fr;gap:24px;padding-top:27px}.questions h2{font-size:28px}.questions p{max-width:none}.footer{display:block}.footer span{display:block;margin-bottom:8px}}
    @media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
    @media print{.wrap{max-width:none;padding:0}.masthead nav{display:none}.hero{padding-top:25px}body{background:white}.diagram-layout{display:block}.selection{margin-top:15px;break-inside:avoid}.map-scroll{overflow:visible}.manifold{min-width:0}.footer{padding-bottom:0}}

    /* Walkthrough 01 additions. */
    .flow{grid-template-columns:repeat(5,minmax(0,1fr));gap:24px}.flow strong{font-size:14px}.flow small{font-size:11px}.flow .step{width:29px;height:29px}.flow li{gap:10px}
    .route-note{font-size:12px;color:var(--ink);background:var(--note-bg);margin:0;padding:14px 20px;border-top:1px solid var(--note-line)}.upstream{border-top:1px solid var(--line);padding-top:32px;margin-bottom:44px}.upstream-grid{display:grid;grid-template-columns:300px 1fr;gap:34px}.upstream figure{margin:0}.upstream img{width:100%;height:375px;object-fit:cover;object-position:center 38%;border-radius:10px;display:block}.upstream figcaption{font-size:11px;color:var(--muted);margin-top:10px}.upstream-notes{display:grid;gap:19px}.upstream-notes article+article{border-top:1px solid var(--line);padding-top:17px}.upstream-notes h3{font-size:16px;margin:0 0 7px}.upstream-notes p{font-size:14px;color:var(--muted);margin:0}.upstream-notes .evidence-time{font-size:11px;letter-spacing:.7px;color:var(--green);font-weight:650;margin-bottom:6px}
    @media(max-width:1180px){.flow{gap:21px}.flow li{gap:7px}.flow strong{font-size:12px}.flow .step{width:25px;height:25px}}
    @media(max-width:720px){.flow{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 24px}.flow strong{font-size:14px}.flow li:nth-child(2n)::after{display:none}.flow .step{width:29px;height:29px}.upstream-grid{grid-template-columns:minmax(0,1fr);gap:23px}.upstream img{height:330px;object-position:center 48%}.upstream-notes{gap:21px}}
    @media(max-width:360px){.flow strong{font-size:13px}}

    /* Walkthrough 02 additions. */

    /* Eight-walkthrough synthesis. */
    .masthead{gap:18px;flex-wrap:wrap}.masthead nav{flex-wrap:wrap;gap:13px 22px}.tank-system,.maintenance{border-top:1px solid var(--line);padding:31px 0 36px}.tank-system{margin-top:44px}.tank-svg{display:block;width:100%;min-width:760px}.tank-svg text{font-family:var(--font);fill:var(--ink)}.tank-scroll{overflow-x:auto;background:var(--white);border:1px solid var(--line);border-radius:12px;padding:14px}.tank-footnote{font-size:12px;color:var(--muted);margin:12px 0 0}.fact-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:23px}.fact-grid h3{font-size:15px}.fact-grid p{font-size:13px;color:var(--muted);margin:0}.source-link{font-size:12px}.context-note{background:var(--pale);border-left:3px solid var(--marker);padding:13px 17px;font-size:13px;color:var(--body-text);margin:20px 0 0}.maintenance-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:25px}.maintenance-grid article{border-top:1px solid var(--line);padding-top:19px}.maintenance-grid p{font-size:14px;color:var(--muted)}.evidence-batch{border-top:1px solid var(--line);padding:30px 0}.evidence-batch>p{font-size:13px;color:var(--muted);margin:12px 0 20px}.clip-record{border-bottom:1px solid var(--line);padding:12px 0}.clip-record summary{cursor:pointer;display:list-item;font-size:14px;font-weight:600}.clip-record summary small{font-size:12px;color:var(--muted);font-weight:400}.clip-record ul{padding-left:22px;font-size:13px;color:var(--muted);max-width:880px}.clip-record li{margin-bottom:10px}.clip-record b{color:var(--ink)}.reference-pair{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:23px}.reference-pair figure{margin:0}.reference-pair img{width:100%;max-height:300px;object-fit:cover;border-radius:9px;display:block}.reference-pair figcaption{font-size:12px;color:var(--muted);margin-top:9px}
    @media(max-width:720px){.masthead nav{gap:12px;font-size:12px}.fact-grid,.maintenance-grid{grid-template-columns:minmax(0,1fr);gap:21px}.tank-scroll{padding:7px}.reference-pair{grid-template-columns:minmax(0,1fr)}.tank-system h2,.maintenance h2{font-size:28px}}

    /* Remaining media review. */
    .field-section{border-top:1px solid var(--line);padding:32px 0 38px}.field-section .section-head p{max-width:850px}.field-section .subhead{font:400 23px/1.2 Georgia,serif;margin:28px 0 14px}.photo-gallery{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.photo-gallery figure{margin:0}.photo-gallery button{display:block;border:1px solid var(--line);padding:0;width:100%;border-radius:9px;overflow:hidden;background:var(--white);cursor:zoom-in}.photo-gallery img{display:block;width:100%;height:245px;object-fit:cover}.photo-gallery figcaption{font-size:12px;color:var(--muted);margin:10px 0 0}.photo-gallery b{display:block;color:var(--ink);margin-bottom:4px}.photo-gallery small{display:block;margin-top:6px}.document-label{font-size:11px;text-transform:uppercase;letter-spacing:1px;color:var(--amber);font-weight:650}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:23px}.field-grid h3{font-size:16px}.field-grid p{font-size:14px;color:var(--muted)}.field-grid figure{margin:0}.field-grid img{width:100%;height:290px;object-fit:cover;border-radius:9px}.field-grid figcaption{font-size:12px;color:var(--muted);margin-top:9px}.photo-dialog{border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--ink);padding:20px;max-width:min(900px,95vw);max-height:92vh;overflow:auto}.photo-dialog::backdrop{background:#142a22c9}.photo-dialog header{display:flex;align-items:start;gap:20px;justify-content:space-between;margin-bottom:15px}.photo-dialog h2{font-size:24px}.photo-dialog button{border:1px solid var(--green);border-radius:5px;padding:8px 15px;background:var(--white);color:var(--ink);cursor:pointer}.photo-dialog img{width:100%;height:auto;display:block}.photo-dialog p{font-size:13px;color:var(--muted);margin-top:12px}
    @media(max-width:720px){.photo-gallery{grid-template-columns:1fr 1fr}.photo-gallery img{height:220px}.field-grid{grid-template-columns:minmax(0,1fr)}.photo-dialog{padding:15px}.photo-dialog h2{font-size:21px}.field-section h2{font-size:28px}.masthead nav{gap:10px 16px}}

    .manifold-photo{position:relative;container-type:inline-size}.manifold-photo>img{display:block;width:100%;height:auto}.photo-open{position:absolute;inset:0;width:100%;height:100%;border:0;background:transparent;cursor:zoom-in}.photo-open span{position:absolute;right:14px;top:14px;background:var(--white);color:var(--forest);padding:9px 13px;border:1px solid var(--forest);border-radius:6px;font-size:13px;box-shadow:0 2px 9px #0002}.photo-open:focus-visible{outline-offset:-5px}.manifold-photo .photo-marker{position:absolute;transform:translate(-50%,-50%);display:grid;place-items:center;width:clamp(24px,4.3cqw,44px);height:clamp(24px,4.3cqw,44px);padding:0;border:2px solid #254e40;border-radius:50%;background:#fffef9;color:#254e40;font-size:clamp(13px,2.3cqw,20px);font-weight:750;cursor:pointer;box-shadow:0 1px 5px #0004;z-index:1;clip-path:circle(50%)}.manifold-photo .photo-marker.is-selected{background:#f7df8d}.manifold-photo .photo-marker:hover{background:#f7df8d}.manifold-photo .photo-marker:focus-visible{outline:0;box-shadow:inset 0 0 0 3px var(--water);border-color:var(--ink)}.photo-selection{background:var(--soft);border:1px solid var(--line);border-radius:9px;padding:18px;margin-bottom:23px}.photo-selection h3{font:400 23px/1.15 Georgia,serif;margin-bottom:12px}.photo-selection p{font-size:13px;line-height:1.6;color:var(--muted);margin:0 0 12px}.photo-selection p:last-child{margin-bottom:0}.manifold-dialog{width:min(1280px,96vw);max-width:96vw}.manifold-dialog header{position:sticky;top:-20px;background:var(--paper);z-index:3;padding:12px 0}.manifold-dialog header p{margin:6px 0 0}.photo-actions{display:flex;gap:8px;flex-shrink:0}.expanded-photo-layout{display:grid;grid-template-columns:minmax(0,1fr) 265px;gap:20px;align-items:start}.expanded-photo-scroll{overflow:auto;border-radius:9px;background:#243c2d;max-height:70vh}.expanded-photo-scroll:focus-visible{outline:3px solid var(--water);outline-offset:3px}.manifold-dialog .photo-marker{padding:0;border-radius:50%}.manifold-dialog .photo-selection{margin:0}.manifold-dialog .photo-marker[aria-pressed=true]{background:#f7df8d}
    @media(max-width:1100px){.expanded-photo-layout{grid-template-columns:minmax(0,1fr)}}
    @media(max-width:720px){.expanded-photo-layout{grid-template-columns:minmax(0,1fr)}.manifold-dialog header{top:-15px;align-items:center;flex-wrap:wrap;gap:12px}.manifold-dialog h2{font-size:23px}.manifold-dialog .photo-actions{width:100%;justify-content:space-between}.photo-open span{font-size:12px;right:9px;top:9px;padding:7px 10px}}
  
/* Page navigation and direct manipulation. */
html{scroll-behavior:smooth}section,[id^="clip-"]{scroll-margin-top:24px}.masthead .brand{text-decoration:none;color:var(--forest)}.masthead nav a{padding:8px 0}.masthead nav a[aria-current="page"]{font-weight:750;border-bottom:2px solid var(--forest)}.section-nav{display:flex;gap:10px 22px;flex-wrap:wrap;padding:14px 0;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}.section-nav a{text-decoration:none;padding:5px 0}/* Hover draws a thin line where the active bar sits, instead of a text underline, so the two never stack or sit at different heights. */
.section-nav a:hover{box-shadow:inset 0 -1px 0 currentColor}.section-nav span{padding:5px 0;text-transform:uppercase;font-size:10px;letter-spacing:1px;align-self:center}.fire-gallery{grid-template-columns:repeat(4,minmax(0,1fr))}.fire-gallery img{height:320px}.record-layout{display:grid;grid-template-columns:minmax(0,380px) minmax(0,1fr);gap:32px}.record-gallery{grid-template-columns:minmax(0,1fr)}.record-gallery img{height:430px;object-fit:contain;background:var(--pale)}.further-reading{display:grid;grid-template-columns:1fr 1fr;gap:24px;border-top:1px solid var(--line);padding:28px 0 38px}.further-reading a{display:block;border:1px solid var(--line);border-radius:9px;padding:22px;text-decoration:none;font-size:14px;color:var(--muted)}.further-reading span{display:block;font:400 25px Georgia,serif;color:var(--forest);margin-bottom:10px}.expanded-photo-scroll.is-zoomed{cursor:grab;overscroll-behavior:contain}.expanded-photo-scroll.is-dragging{cursor:grabbing}.expanded-photo-scroll img{user-select:none;-webkit-user-drag:none}.expanded-photo-scroll.is-dragging *{cursor:grabbing!important;user-select:none}.expanded-photo-scroll{scroll-behavior:auto}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media(max-width:720px){.section-nav{gap:6px 17px}.fire-gallery{grid-template-columns:1fr}.fire-gallery img{height:330px;object-fit:contain}.record-layout,.further-reading{grid-template-columns:minmax(0,1fr)}.record-gallery img{height:400px}}

/* Source images sit with the equipment and explanation they document. */
.context-photo{margin:20px 0 0;min-width:0}.context-photo button{display:block;width:100%;padding:0;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--white);cursor:zoom-in}.context-photo img{display:block;width:100%;height:310px;object-fit:cover;border-radius:0}.context-photo figcaption{font-size:12px;line-height:1.5;color:var(--muted);margin:10px 0 0}.context-photo figcaption b{display:block;color:var(--ink);margin-bottom:4px}.context-photo small{display:block;margin-top:6px}.field-evidence-list{margin-top:27px}.field-evidence{display:grid;grid-template-columns:minmax(0,300px) minmax(0,1fr);gap:32px;align-items:center;margin-top:25px;padding-top:25px;border-top:1px solid var(--line)}.field-evidence-list .field-evidence:first-child{margin-top:0;padding-top:0;border-top:0}.field-evidence .context-photo{margin:0}.field-evidence .context-photo img{height:355px}.field-evidence h3{font-size:18px}.field-evidence p{font-size:14px;color:var(--muted)}.field-evidence p:last-child{margin-bottom:0}.fire-storage .context-photo img{height:auto}.fire-storage .fact-grid{grid-template-columns:minmax(0,1fr);margin:0;gap:23px}.upstream .context-photo{margin:0}.upstream .context-photo img{height:375px}
@media(max-width:720px){.field-evidence{grid-template-columns:minmax(0,1fr);gap:20px;align-items:start;margin-top:28px;padding-top:28px}.field-evidence>div{grid-row:1}.field-evidence .context-photo img{height:360px}.context-photo img{height:300px}.upstream .context-photo img{height:330px}.fire-storage>.fact-grid{grid-row:auto}.context-photo button:focus-visible{outline-offset:3px}}
/* Clarity revision: plain names, colour-coded fill and supply, route valve states, one picker, reading order. */
:root{--fill:#2c7a93;--fill-text:#1f6278;--supply:#a8671d;--supply-text:#86500f;--open:#2f8a4f;--closed:#b23b2a;--hidden-pipe:#8d948d;--sea:#4f5f99}
.section-nav{position:sticky;top:0;z-index:20;background:var(--paper)}
.section-nav a.is-active,.section-nav a.is-active:hover{color:var(--ink);font-weight:700;box-shadow:inset 0 -2px 0 var(--forest)}
section,[id^="clip-"]{scroll-margin-top:64px}
.tag{display:inline-block;font-size:10px;font-weight:750;letter-spacing:.8px;text-transform:uppercase;color:var(--tag-text);background:var(--tag-bg);border:1px solid var(--tag-line);border-radius:4px;padding:0 6px;line-height:17px;vertical-align:1px;margin-right:5px}
.unconfirmed{font-size:13px;color:var(--muted)}
.src{display:inline-block;font-size:11px;line-height:1.5;color:var(--green);border:1px solid var(--line-strong);border-radius:999px;padding:1px 9px;text-decoration:none;white-space:nowrap;background:var(--white);vertical-align:1px}
.src::before{content:'▶';font-size:7px;margin-right:6px;vertical-align:2px}
.src:hover{border-color:var(--green)}
.sources{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 0}
.chip{font-weight:650;border-bottom:2px solid}
.chip.fill{color:var(--fill-text);border-color:var(--fill)}
.chip.supply{color:var(--supply-text);border-color:var(--supply)}
.flow .step.fill{border:2px solid var(--fill);color:var(--fill-text)}
.flow .step.supply{border:2px solid var(--supply);color:var(--supply-text)}
.tasks{padding:2px 0 42px}
.task-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.task-card{background:var(--white);border:1px solid var(--line);border-radius:10px;padding:20px 22px;display:flex;flex-direction:column}
.task-card h3{font-size:17px}
.task-card p,.task-card li{font-size:14px;color:var(--body-text)}
.task-card ol{padding-left:20px;margin:0 0 14px}
.task-card li{margin-bottom:4px}
.task-card b{color:var(--ink)}
.task-foot{margin-top:auto;padding-top:12px;display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between}
.task-show{border:1px solid var(--forest);background:var(--forest);color:var(--on-forest);border-radius:6px;padding:8px 14px;font-size:13px;font-weight:600;cursor:pointer;min-height:40px}
.task-show:hover{background:var(--ink)}
.map-toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:12px 20px;border-bottom:1px solid var(--line-soft)}
.view-toggle{display:inline-flex;border:1px solid var(--line-strong);border-radius:7px;overflow:hidden;flex-shrink:0}
.view-toggle button{border:0;background:var(--white);color:var(--forest);padding:7px 18px;font-size:13px;font-weight:600;cursor:pointer;min-height:38px}
.view-toggle button+button{border-left:1px solid var(--line-strong)}
.view-toggle button[aria-pressed=true]{background:var(--forest);color:var(--on-forest)}


.route-note{background:var(--note-bg);border-top:0;border-bottom:1px solid var(--note-line);padding:12px 20px;font-size:13px;color:var(--ink)}
.route-path{margin:0 0 8px;font-weight:550}
.valve-states{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px 16px;align-items:center}
.valve-states li{display:flex;align-items:center;gap:6px}
.valve-states b{font-size:10px;text-transform:uppercase;letter-spacing:.8px;padding:1px 7px;border-radius:4px;color:#fff}
.valve-states .is-open b{background:var(--open)}
.valve-states .is-closed b{background:var(--closed)}
.manifold text{font-size:19px}
.manifold .small{font-size:17px}
.manifold .mini{font-size:16px}
.manifold .header-label{font-size:19px;font-weight:650}
.manifold .header-label.fill{fill:var(--fill-text)}
.manifold .header-label.supply{fill:var(--supply-text)}
.manifold .pipe.fill{stroke:var(--fill)}
.manifold .pipe.supply{stroke:var(--supply)}
.manifold .pipe.tank{stroke:var(--pipe-idle)}


.manifold .ports circle{fill:var(--white);stroke:var(--ink);stroke-width:3}
.manifold .filter-body{fill:var(--filter-body);stroke:var(--filter-edge);stroke-width:2}


.manifold .valve use{fill:var(--white);stroke:var(--ink);stroke-width:2.5}
.manifold .valve-label{fill:var(--ink);font-size:17px;font-weight:650}
.manifold .valve-state{font-size:14px;font-weight:650}
.manifold .pipework,.manifold .valve{transition:opacity .2s}
.manifold.has-route .pipework{opacity:.28}
.manifold.has-route .valve{opacity:.35}
.manifold.has-route .valve.is-open,.manifold.has-route .valve.is-closed,.manifold.has-route .valve.is-unknown{opacity:1}
.manifold .valve.is-open use{fill:var(--open);stroke:#1f5f35}
.manifold .valve.is-open text{fill:var(--open-text)}
.manifold .valve.is-closed use{fill:var(--closed);stroke:#7c2317}
.manifold .valve.is-closed text{fill:var(--closed-text)}
.manifold .valve.is-unknown use{fill:#f1f2ed;stroke:#6f776f;stroke-dasharray:4 3}
.manifold .valve.is-unknown text{fill:#5b635c}
.manifold .route-line{fill:none;stroke-width:13;stroke-linecap:round;stroke-linejoin:round}
.manifold .route-line.fill{stroke:var(--fill)}
.manifold .route-line.supply{stroke:var(--supply)}
.manifold .route-flow{fill:none;stroke:#fff;stroke-width:3;stroke-dasharray:2 16;stroke-linecap:round;opacity:.55;animation:water-flow .9s linear infinite}
@keyframes water-flow{to{stroke-dashoffset:-18}}
.map-view[data-view-panel=photo]{padding:12px 12px 0}
.map-view .manifold-photo{border-radius:8px;overflow:hidden}

.photo-lanes{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.photo-lanes line{stroke:#f7df8d;stroke-width:26;stroke-linecap:round;opacity:0;transition:opacity .2s}
.photo-lanes line.is-selected{opacity:.5}
.valve-pin{position:absolute;transform:translate(-50%,-50%);width:clamp(16px,3.2cqw,32px);aspect-ratio:1;border-radius:50%;border:3px solid #f7df8d;box-shadow:0 0 0 1px #0007,inset 0 0 0 1px #0007;pointer-events:none;z-index:1}
.valve-pin span{position:absolute;left:70%;bottom:70%;background:#f7df8d;color:#203c34;font-size:clamp(10px,1.7cqw,15px);font-weight:750;line-height:1;padding:3px 5px;border-radius:4px;box-shadow:0 1px 3px #0006;white-space:nowrap}
.valve-pin.is-open{border-color:#6fd08f}
.valve-pin.is-open span{background:var(--open);color:#fff}
.valve-pin.is-closed{border-color:#f08a78}
.valve-pin.is-closed span{background:var(--closed);color:#fff}
.valve-pin.is-unknown{border-color:#e4e6e0;border-style:dashed}
.valve-pin.is-unknown span{background:#e4e6e0}
.valve-pin.is-unknown span::after{content:' ?'}
.map-foot{border-top:1px solid var(--line-soft);padding:12px 20px 14px}
.map-foot .key{display:flex;flex-wrap:wrap;justify-content:flex-start;max-width:none;gap:8px 18px;font-size:12px;color:var(--muted);padding:0;margin:0}
.map-foot .route-key{margin-top:8px}
.key-title{font-weight:700;color:var(--ink);font-size:10px;text-transform:uppercase;letter-spacing:.8px}
.map-foot .key i{flex-shrink:0;display:inline-block}
.key .line{width:24px;height:0;border-top:5px solid}
.key .line.fill{border-color:var(--fill)}
.key .line.supply{border-color:var(--supply)}


.key .port{width:12px;height:12px;border-radius:50%;border:2.5px solid var(--ink);background:var(--white)}

.key .route-swatch{width:28px;height:9px;border-radius:5px;background:linear-gradient(90deg,var(--fill) 50%,var(--supply) 50%)}
.valve-icon{width:13px;height:15px;flex-shrink:0;fill:var(--white);stroke:var(--ink);stroke-width:2.5}
.valve-icon.is-open{fill:var(--open);stroke:#1f5f35}
.valve-icon.is-closed{fill:var(--closed);stroke:#7c2317}
.valve-icon.is-unknown{fill:#f1f2ed;stroke:#6f776f;stroke-dasharray:4 3}
.map-foot .map-note{padding:10px 0 0}
.selection dd.sources{display:flex;flex-wrap:wrap;gap:5px}
.selection .unknown{color:var(--tag-text)}
.tank-figure{background:var(--white);border:1px solid var(--line);border-radius:12px;padding:14px}
.tank-figure .tank-svg{min-width:0}
.tank-svg text{font-size:16px}
.tank-svg .svg-caption{font-size:14px;font-weight:650;fill:var(--muted);letter-spacing:.4px}
.tank-svg .muted{fill:var(--muted);font-size:14px}
.tank path,.tank ellipse{fill:#edf0e5;stroke:#456c59;stroke-width:2;transition:fill .15s}
.tank-svg a{cursor:pointer}
.tank-svg a:hover path,.tank-svg a:hover ellipse,.tank-svg a:focus-visible path,.tank-svg a:focus-visible ellipse{stroke:#c9a93a;stroke-width:4}
.tank-svg a:focus{outline:none}
.tank-svg .tank-no{font:400 30px Georgia,serif;text-anchor:middle}

.tank-svg .tank-chip{font-size:14px;text-anchor:middle;fill:var(--green);font-weight:650;text-decoration:underline}
.tank-svg .flow-fill{fill:none;stroke:var(--fill);stroke-width:4}
.tank-svg .flow-supply{fill:none;stroke:var(--supply);stroke-width:4}
.tank-svg .flow-drain{fill:none;stroke:#7d857e;stroke-width:4;stroke-dasharray:8 6}
.tank-svg .flow-label{font-size:14px;text-anchor:middle;fill:var(--muted)}
.tank-svg .supply-text{fill:var(--supply-text);font-weight:650}
.tank-tall{display:none;max-width:380px;margin:0 auto}
.fire-svg text{font-size:17px}
.fire-svg .muted{font-size:15px}
.fire-svg .svg-caption{font-size:15px}
.fire-box rect{fill:var(--pale);stroke:var(--line-strong)}
.fire-svg .flow-fresh path,.fire-svg .flow-sea path{fill:none;stroke-width:4}
.fire-svg .flow-fresh path{stroke:var(--fill)}
.fire-svg .flow-sea path{stroke:var(--sea)}
.fire-svg .selector{fill:var(--sea-soft);stroke:var(--sea);stroke-width:2.5}
.fire-svg .sea-text{fill:var(--sea-text);font-weight:650;font-size:16px}
@media(max-width:1000px){.task-grid{grid-template-columns:minmax(0,1fr)}
.tank-wide{display:none}
.tank-tall{display:block}
}
@media(max-width:720px){.section-nav{flex-wrap:nowrap;overflow-x:auto;white-space:nowrap;scrollbar-width:none;gap:20px;margin:0 -20px;padding:10px 20px}
.section-nav::-webkit-scrollbar{display:none}
.section-nav span{display:none}
.map-toolbar{padding:10px 14px;flex-wrap:wrap}

.route-note{padding:12px 14px}
.map-foot{padding:12px 14px}
.tank-figure{padding:10px}
}
@media(prefers-reduced-motion:reduce){.manifold .route-flow{animation:none;display:none}
}
@media print{.section-nav,.view-toggle,.task-show{display:none}
.section-nav{position:static}
.map-view[hidden]{display:block!important}
}
/* Manifold settings: fill tank, supply tank, and inlet. */
.arrangement{display:flex;flex-wrap:wrap;gap:10px 22px;align-items:center;padding:12px 20px;border-bottom:1px solid var(--line-soft);font-size:14px}
.arrangement label{display:flex;align-items:center;gap:8px;color:var(--muted);font-weight:600}
.arrangement select{font:inherit;font-weight:650;color:var(--ink);background:var(--white) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23456c59' stroke-width='1.6'/%3E%3C/svg%3E") no-repeat right 10px center;border:1px solid var(--line-strong);border-left-width:4px;border-radius:6px;padding:7px 30px 7px 10px;min-height:38px;appearance:none;cursor:pointer}
.arrangement .fill select{border-left-color:var(--fill)}
.arrangement .supply select{border-left-color:var(--supply)}
.arrangement .inlet select{border-left-color:var(--forest)}
.arrangement select:disabled{opacity:.45;cursor:not-allowed}
.arrangement select:focus-visible{outline:3px solid var(--water);outline-offset:2px}
.arrangement .reset{margin-left:0;border:0;background:none;padding:6px 0;color:var(--green);text-decoration:underline;text-underline-offset:3px;font-size:13px;cursor:pointer}
.route-note .route-path{margin:0 0 4px}
.route-warn{margin:6px 0 4px;color:var(--supply-text);font-weight:600}
.valve-states{margin-top:8px}
.valve-states .recorded{font-size:12px;color:var(--muted)}
.valve-pin.is-current{box-shadow:0 0 0 2px #f7df8d,0 0 0 3px #0007}
@media(max-width:720px){.arrangement{padding:12px 14px;flex-direction:column;align-items:stretch;gap:10px}
.arrangement label{justify-content:space-between}
.arrangement select{flex:1;max-width:230px}
.arrangement .reset{margin-left:0;text-align:left}
}
/* A selected section is outlined in the same yellow as the selected photo marker, so it never reads as water or a valve state. */
.manifold [data-branch].is-selected .lane{fill:#f7df8d2e;stroke:#c9a93a;stroke-width:2.5;stroke-dasharray:7 6}
/* Tank colours sampled from the walkthrough video: tank 1 dark green, tank 2 black, tanks 3 and 4 pale sage. */
.tank.t1 path{fill:#1f6a66;stroke:#0e4643}
.tank.t1 ellipse{fill:#2a7a75;stroke:#0e4643}
.tank.t2 path{fill:#2f3332;stroke:#141716}
.tank.t2 ellipse{fill:#414645;stroke:#141716}
.tank.t3 path,.tank.t4 path{fill:#b9cdc7;stroke:#5f7d76}
.tank.t3 ellipse,.tank.t4 ellipse{fill:#cddcd8;stroke:#5f7d76}
.tank.t1 .tank-no,.tank.t2 .tank-no{fill:#fff}
.tank-tall .tank.t1 .tank-chip,.tank-tall .tank.t2 .tank-chip{fill:#e3efe9}
/* Dialog close: an X with a delayed "Close" tooltip. */






.photo-actions{align-items:center}
/* Show water flow switch. */
.flow-toggle{margin-left:auto;font-size:14px;display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:600;cursor:pointer}
.flow-toggle input{appearance:none;flex-shrink:0;width:36px;height:21px;margin:0;border-radius:999px;background:var(--line-strong);position:relative;cursor:pointer;transition:background .15s}
.flow-toggle input::after{content:'';position:absolute;top:2.5px;left:2.5px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 2px #0003;transition:transform .15s}
.flow-toggle input:checked{background:var(--forest)}
.flow-toggle input:checked::after{transform:translateX(15px)}
.flow-toggle input:focus-visible{outline:3px solid var(--water);outline-offset:2px}
/* Sections are selected directly on the diagram. */
.manifold [data-branch],.manifold .valve[data-valve]{cursor:pointer}
.manifold .pipework,.manifold .routes,.manifold .labels,.manifold .tank-labels{pointer-events:none}
.manifold [data-branch]:hover .lane{fill:#f7df8d1f}
.manifold [data-branch]:hover .id-circle{stroke:#c9a93a;stroke-width:2.5}
.manifold g[data-branch][role=button]:focus{outline:none}
.manifold g[data-branch][role=button]:focus-visible .id-circle{stroke:var(--water);stroke-width:4}
@media(max-width:1180px){.selection{display:block}
.selection .detail-body{min-height:0}
}
/* The details panel sits under the diagram at every width, so showing or hiding it never shifts the diagram sideways. */
.diagram-layout{grid-template-columns:minmax(0,1fr)}
.selection dl{display:grid;grid-template-columns:105px 1fr;gap:10px}
.selection dt,.selection dd{margin:0}
@media(max-width:720px){.selection dl{grid-template-columns:95px 1fr}
}
/* The details panel opens only while a section is selected: beside the diagram on wide screens, sliding open by width, and below it otherwise. */
.selection:not(.is-open){display:none}
@media(min-width:960px){.diagram-layout{display:flex;align-items:flex-start;gap:0}
.manifold{min-width:0}
.diagram-layout>div:first-child{flex:1 1 auto;min-width:0}
.selection,.selection:not(.is-open){display:block;flex:0 0 auto;width:0;margin-left:0;padding:22px 0;border-width:0;opacity:0;overflow:hidden;transition:width .32s ease,margin-left .32s ease,padding .32s ease,opacity .22s ease,border-width .32s}
.selection.is-open{width:310px;margin-left:22px;padding:22px;border-width:1px;opacity:1}
.selection{position:sticky;top:64px;max-height:calc(100vh - 80px);overflow-x:hidden;overflow-y:auto}
.selection>*{width:264px}
.selection dl{display:block}
.selection dt{margin-top:12px}
.selection dd{margin:4px 0 0}
}
/* Every enlarged photo zooms and pans the same way. */
.expanded-photo-scroll:not(.is-zoomed){cursor:zoom-in}
.photo-dialog .photo-dialog-scroll img{width:auto;max-width:100%;max-height:70vh;margin:0 auto}
.photo-dialog .photo-dialog-scroll.is-zoomed img{max-width:none;max-height:none}
.zoom-hint{font-size:12px;color:var(--muted);margin:8px 0 0}
/* Dialog header: title, Zoom and X share one 30px line; the X shows a background only on hover or focus. */
.photo-dialog header{align-items:flex-start}
.photo-dialog h2{line-height:30px}
.photo-dialog .photo-actions{gap:6px}



/* Dialog icon buttons (zoom out, zoom in, close) share one look and a delayed tooltip. */
.photo-dialog .icon-button{position:relative;flex-shrink:0;width:30px;height:30px;padding:0;display:grid;place-items:center;border:1px solid transparent;border-radius:50%;background:transparent;color:var(--ink);cursor:pointer}
.photo-dialog .icon-button:hover:not(:disabled),.photo-dialog .icon-button:focus-visible{border-color:var(--line);background:var(--pale)}
.photo-dialog .icon-button:disabled{opacity:.35;cursor:default}
.icon-button svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.icon-button::after{content:attr(aria-label);position:absolute;top:calc(100% + 6px);right:0;background:var(--ink);color:var(--paper);font-size:12px;line-height:1;padding:6px 8px;border-radius:4px;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .15s;z-index:5}
.icon-button:hover:not(:disabled)::after{opacity:1;transition-delay:1s}
.icon-button:focus-visible::after{opacity:1}
.photo-dialog .photo-dialog-scroll.is-zoomed img,.expanded-photo-scroll.is-zoomed .manifold-photo{max-width:none;max-height:none}
#photo-dialog-caption small{display:block;margin-top:4px;font-size:12px}

/* No-water checklist and ideas list */
.no-water{border-top:1px solid var(--line);padding:30px 0 36px}
.checklist{margin:0;padding-left:24px;max-width:820px;display:grid;gap:12px}
ul.checklist{padding-left:20px}
.checklist li{font-size:14px;color:var(--body-text);padding-left:6px}
.checklist li::marker{font-family:Georgia,serif;color:var(--marker)}
.checklist b{color:var(--ink);font-weight:600}
.checklist .unconfirmed{font-size:inherit}
/* Tank labels that follow the manifold settings */
.tank-svg .tank-status{font-size:14px;font-weight:700;text-anchor:middle;letter-spacing:.2px}
.tank-svg .tank-status .fill{fill:var(--fill-text)}
.tank-svg .tank-status .supply{fill:var(--supply-text)}
/* Valves in the details panel */
.valve-list{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.valve-list li{font-size:13px;color:var(--body-text)}
.valve-list b{color:var(--ink);margin-right:2px}
.valve-badge{display:inline-block;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;padding:0 7px;border-radius:4px;color:#fff;line-height:17px;vertical-align:1px}
.valve-badge.is-open{background:var(--open)}
.valve-badge.is-closed{background:var(--closed)}
.photo-selection .valve-list{margin-top:4px}
/* Drains and upkeep: the photo article spans both rows */
@media(min-width:721px){.maintenance-grid{grid-template-rows:auto 1fr}.maintenance-grid>article:first-child{grid-row:span 2}}
.upstream-notes{align-content:start}
/* Fire start card, shown in full */
.start-card{margin-top:28px;border-top:1px solid var(--line);padding-top:20px;max-width:720px}
.start-card h3{font:400 23px/1.2 Georgia,serif}
.start-card ol{padding-left:23px;margin:12px 0}
.start-card li{font-size:14px;margin-bottom:5px}
/* Records: the posted sheet as text */
.record-text h3{font-size:16px;margin:0 0 6px}
.record-text h3:not(:first-child){margin-top:22px}
.record-text p{font-size:14px;color:var(--muted);margin:0 0 8px}
@media(max-width:1000px){.fire-gallery{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:720px){.fire-gallery{grid-template-columns:1fr}}
/* Valve pins select their section instead of zooming the photo. */
.valve-pin{pointer-events:auto;cursor:pointer}
.expanded-photo-scroll{overscroll-behavior:contain}
/* Route strip: full-height figures centre in the circles (Georgia's old-style 3 and 4 drop below the line), and the arrows sit in the middle of the gaps. */
.flow .step{font:600 15px/1 var(--font);font-variant-numeric:lining-nums tabular-nums}
.flow li:not(:last-child)::after{right:-12px;transform:translateX(50%);font-size:18px}
.nowrap{white-space:nowrap}
/* Photo letters sit just below the front pipe, on the line of their lane: each is anchored where the lane meets the pipe's lower edge and pushed out along the lane (--ux, --uy) by its own radius. */
.manifold-photo .photo-marker{transform:translate(calc(-50% + var(--ux,0) * 72%),calc(-50% + var(--uy,0) * 72%))}

/* Dark theme. It follows the system setting unless the header toggle (or a host page) sets data-theme on the root element.
   Only tokens change here; the real tank colours and everything drawn over the photo stay the same in both themes. */
@media(prefers-color-scheme:dark){:root:not([data-theme="light"]){color-scheme:dark;--paper:#121815;--white:#1a221e;--ink:#e3ebe4;--muted:#a3ada4;--line:#2e3a33;--forest:#9fd0b4;--on-forest:#10201a;--green:#8fbfa4;--water:#6fb6c8;--rust:#e08a74;--amber:#d9b36a;--pale:#232d27;--selected:#243029;--fill-text:#7cc3d8;--supply-text:#e0a55a;--body-text:#c3ccc4;--soft:#1e2823;--line-soft:#29342e;--line-strong:#46554c;--marker:#8a9a8d;--draft-rule:#8a7a52;--tag-text:#e8cf95;--tag-bg:#3a3120;--tag-line:#5e4f2c;--note-bg:#1b2a2c;--note-line:#2b4043;--pipe-idle:#8a968d;--open-text:#7fd49c;--closed-text:#f09a88;--sea-text:#aab6e8;--sea-soft:#2a3350;--pipe-cabin:#6f9f86;--pipe-fire:#8c948e;--grid-dot:#223029;--moon-display:none;--sun-display:block;--sea:#8391d4;--filter-body:#3f6357;--filter-edge:#86ad9e}}
:root[data-theme="dark"]{color-scheme:dark;--paper:#121815;--white:#1a221e;--ink:#e3ebe4;--muted:#a3ada4;--line:#2e3a33;--forest:#9fd0b4;--on-forest:#10201a;--green:#8fbfa4;--water:#6fb6c8;--rust:#e08a74;--amber:#d9b36a;--pale:#232d27;--selected:#243029;--fill-text:#7cc3d8;--supply-text:#e0a55a;--body-text:#c3ccc4;--soft:#1e2823;--line-soft:#29342e;--line-strong:#46554c;--marker:#8a9a8d;--draft-rule:#8a7a52;--tag-text:#e8cf95;--tag-bg:#3a3120;--tag-line:#5e4f2c;--note-bg:#1b2a2c;--note-line:#2b4043;--pipe-idle:#8a968d;--open-text:#7fd49c;--closed-text:#f09a88;--sea-text:#aab6e8;--sea-soft:#2a3350;--pipe-cabin:#6f9f86;--pipe-fire:#8c948e;--grid-dot:#223029;--moon-display:none;--sun-display:block;--sea:#8391d4;--filter-body:#3f6357;--filter-edge:#86ad9e}
/* Pale tanks keep dark labels in either theme. */
.tank.t3 .tank-no,.tank.t4 .tank-no{fill:#203c34}
.tank-tall .tank.t3 .tank-chip,.tank-tall .tank.t4 .tank-chip{fill:#2f5a47}
/* Inline diagram colours that follow the theme. */
.manifold .grid-dot{fill:var(--grid-dot)}
.manifold .side-fitting{fill:var(--white)}
.branch-svg .cabin-pipe{stroke:var(--pipe-cabin)}
.branch-svg .stripe{stroke:#fffef9}
.branch-svg .box{fill:var(--pale);stroke:var(--line-strong)}
.branch-svg .fire-pipe{stroke:var(--pipe-fire)}
/* Light/dark toggle in the header. */
.masthead-end{display:flex;align-items:center;gap:22px}
.theme-toggle{position:relative;display:grid;place-items:center;width:32px;height:32px;padding:0;border:1px solid transparent;border-radius:50%;background:transparent;color:var(--ink);cursor:pointer}
.theme-toggle:hover{border-color:var(--line-strong);background:var(--white)}
.theme-toggle svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round}
/* The header tooltip sits above the sticky section nav. */
.theme-toggle::after{z-index:30}
.theme-toggle .moon{display:var(--moon-display)}
.theme-toggle .sun{display:var(--sun-display)}
@media print{.theme-toggle{display:none}}
#f-arrow-sea path{fill:var(--sea)}
/* Photos of the storage tanks and the level monitor. */
.tank-photos{grid-template-columns:repeat(3,minmax(0,1fr));margin-top:28px}
@media(max-width:720px){.tank-photos{grid-template-columns:minmax(0,1fr)}}
/* Logo: Astra's Shore Pine mark (the simplified "micro icon" version) and a serif wordmark, as in the nav lockup.
   The mark is an alpha mask, so it takes the theme's forest colour in light and dark mode. */
.masthead .brand{gap:10px;font:400 22px/1 Georgia,"Times New Roman",serif;letter-spacing:0;text-transform:none}
.masthead .brand-mark{width:44px;height:34px;flex-shrink:0;background:currentColor;-webkit-mask:url("data:image/png;base64,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fCWrWuxCeLp8UOkcp8ijFHu1huUbXbUzi5tgC8r45rIQCl82E1Ob4S5tft5i5Ic1OpyxPUZHGn+vDYActq6PirN3t8sFTik/kbK6yITx93AhUx5mgXoyqG4Uft4+xXP6+1ZRci8noM0Zl1WhvHZiU4/cT+DxERW5ogNRHH4W9k6B0DzNr4NHmuY6m0FGk7nDOlN7ah6DKVAKwaYDbYRCPEhz0A4wS13sVaiKizHbSA8FbwXy9IuJTLKN7LM1CzlAVwxaJXSzeVnejPN3azlikrtQBkUVOqVyKa/B1Ez5d2XP0I0aW5C+0z1T/z1ct347n6Ss9LWOHqWxnNQvaXASADVJnSMqrleinyGgPQnoD/ojyUTkHUKg2tG3uF3mcNtXkP1cAjoLiyolmOrBFTW6DfP0LOv2VBlGM7nrIkFvDMuLmuPoDZvLCPSXVeMirnZ6bP/KlBCeeMcav/44g61R87EHTFQoT4al50gs8imNdPgX/agAuYI2K24ByTqwFHPH5TWWqvidQI0EqOq8BDji3xPwD/VEdvHgk+sIsi6PRMBVkPfvyeUPkjDhnquzBcNWFlzZarzMNcnAPfZMuYd3A3TLQOQbmJTGW/VM+O1e/8PXzFF6H9BqR6RDnPIZuos+8CzLdQRZYiTH38A0znF2E2+YaeUeDqhgqfC7M16lxMH8DshGeJmB0DEJRMPRgayve93AzLC9G7J14d5r9HKsf2PUTmUIfI/aNUpvfcRxd22NFslgLy0SAlaWzdIwYYr0jnG4luNXT6/FFo8PRM8MlS5NR3Uqj9NRlfM19rjcc8XcRn4fQfKNVjBVINnlT3vXqcR0CrjlHUaabzczC3H5LKPIoHoTnuh2/3ED7D/QZlTwARl+bwAcwFGU+wthKhMo7r8OmeXrIENxOCSjd8l062OzrABZmZBOPDNIp8A/FoIq1ZQIqPUfd/J2mENRLmRbcHqNW32w3vXURyBkwVD2/JekBWLyJlYpjdh5xzzgz8NqDPbkQ153s52Y9pp7XaHc5Kne+npXoiYK10jWmBUTiyezlAaPXKZDz0RIOBmwlkvdBmN8CZFhk/z0JwQynwLgGVkCMtyCCJGkzs1pUZ7bJWwqVnbFZan4eK0XFTOpzlgOlqItNO6kZpiFugsofJT8l7OC9Xk1l0eKNUd+hM5onj5l31y1bgghZxcfWi3o4MhNEBCqqtpLqoUJ9rH+eviVIxk2bTEvMyPv/o5iJHiLcr0mfZ79Og4y6YbvVH5znXY1qBy7SWrvL6JXBcY6S13CnPbi7Q6AHzZe6A6dmYoTePJVCgvBNAyRJF8BD8SA0yvoIU1WkwofMoU/FWEMOriGpRgng1aceCE8jwPFollLVBmBep0Pqyf5dKrdxF+I6FMn6qz7TTXEb0nQ8foOQAq1aZMftkG8iZ32+KeB13DIF2ln8fx7cGJrOPTJde9JPhmynIbPpiJ/i3Q0GjaPJdhxyfLuEKJENSvRLIGpCo+vu/SSkiHfe+GKki/Y4tZHzCu02mYRLc7vhOhPK9Ut3cGjd3ZyU7I3Coj9gE+Bwe2qsX9VsAwYvQzjaYeAW9fzZpj9kOs94h4eISh0MrMXGbwf7uBqd1roSLlNY69x0yjdeXtDD4fIDLTlRR4ieFB3GS9eJpw+rrNiFVn6bfuCNI2UGYPa3V0hTWbVKZaaaugVY+LHVoFJvo0y7htB5BQHAx3IlrQb/o+IG3gNvbUsIS8XbnuW822bQEVxvY4/+V6jb/OFyPDTEx32SZVM85TW1CWto02UIA4XEiVbMA2oMgYu8D6K5AROeboJimvxVI8yO0VSriedz/b7bMfAeB4Qapbp2PU2RnqZ9RkJsnOMDdFE+WgUJ/975g/9VsPgLfKSvVjcCDoGZ+BE21i1TPg/WVP/smJ86YjXv4zGwsl7AhNifxcm7WkFFGRHRABOkpmzDIbFsAU3cg/EZtp/s4uDuNIH+KKFSjzV0paHFLmFhSDVyPabWxau/BHbxSwsaKQgyA2XvUmf0kTI7I5pWcredQWy/ka/D7NPrbgYCVdqxBMhVRqvsbzwNHZe1lvBhUPc1lFQvnkondlJeyq+XjuOYsjkmLs9LHjCwaNPLx8+CAxkhzFWV8bZTPqc9KuMTddkRmTpe71+1B4OgvXYMMnfFdQpa0PkZClt0c2nIMcJWluq3+agkXL5iJfX6+sekz2jRam9kdEtZwFcXfEVOvBFgDgZMles2gZJthZtHAdYaExW1FabxX0JK3f5YKISlkdpNG0hlGQ1jqxzZN+L4E7RWH5/KZySzM43cRUaWccD2JpKYpl9VJz93iNK1k+DS0zphUlzQ3CjCroT9HQpLWnYWfAGwz3toiQORumq7Q5gmt675XwnKbfEyeqxZzr/u5VcKiPfbzOh2NlmybmS/FzrReYB2hpAWBukLrKVKZPKitXFpQp2W/VjZjTapFmdi8hiL5YvodlyIqVTD3ODdCArDNKAK0lI4+HiKVhQR0VLgmp7XSVJl4LbUdIDNmHFdWqst7Sy0AGS/ErmUvWrx3o1SI1wV03AnINvGN52dpwdt1ANUQmToeWWnJWZ7gPJHm0VpjioyY5dLfXgQAi0mTJdsmDC5LnGp90SMSNpH2wmlfCeEKTWseLTgOvWsem9VgUX1/BQKc1lvNk+qphtO+7mlz2jrJWb9cwqaFfgm7Y9zlUgbwf+tUiXLmJ6rJhiOe85pB+vclBCSeK9ZBUWcCtCnYzN9SDaA5Q20QvQIOtZb16prTn8T/tNtHu1Gehg/GC0HZWHDWaKUIcxd3gl8c1t/asLRadLmE8xZSEb817Qlokm2SNdfOcJoVJDwdkLc54Li011CXvztTKv10T0mYkOZacV7OJUtRpQ9s9eZfDUt0vtJApt+tNe86XuA78B+vASenazu+lrSbbw3vZGsxDWHg0sI9aySwBaJ+DpOjqR6dwrKH587Xv3cC2LRx42b4bS9jP24vnoEu42i3Rif5+cZIcsc3D8g1wOtvuhv0Ct9cXc5jQne0AFgcbR2NKHFMqpeds9axQdACOrLoeqmMTtLOlvke06MNB1oS/A7ix24CWF+Az8ZjuXMeItYAM0IabFjGT/Pz+XYFMte2dqOJEbarYPoX1nEZ2hOoNA8wA9eREs46Ne6qJNXr9gw7mqgIk6gly1qZujdM5u4A3Szn+7R+azeQs8skXDF2vcOdWSdzwfn+cgxgubMZ3MWqeI1IG1Cix6DDhD8olTSUdvfoDIwtHaAl2qwBYHHjwO4SznywdjF3gBuvVJYhx92AodHjr0F6PggiVoGnrVQ6Pnt/j+ZUP05X2tDSG+3h00mC2iy6Tqqn4ZiJy0t1F3MckNUSXijLtLT6ndpK/zCCmLMIaEnk2SDALGK8Aid4UPyjj0oRJshqs4akekEAVxSYj8EczQP9MdsxPT0A+iFSqbxYjqj1qwDeGtKahQi/q1GgcWeSNZuwlh7F92rH067kTiQgiwEwSw53424tRTjbpRrRGhOevrWqWdvZ2j/nkVO9pYQVEVGsezcurq46dhv5ZDmpvWhByaOFa42nLEr1arZDEqa+RhAU7J2ALD7AzD86hjTQRHKEtXKHtiioaoc/Q0Nx9JkiE8TH2OMAb3v4bXmpXqNoIoN0SxHPDXC2cPwoXICDHfI22WpQEnNhfobprm6UVR92nkcJ19M/CYdal6P7CKLMC+CrvRcAnE8abJ6ELfRbwV+zpHpOokeGt2LxAztui3o1yj6OQJbkOx2/y8Cl5OlnpXpViLjD/puVMjnvdtEyiCJtyNp6cGfflspknDb4bHMknKG1ALTHGgkrZAvSmhxnOcJ3y5MmsxEFPs2bgEsqwzXuINNYmGRguSArEh0xTGy/XdgR0haHOf7YVjCd80H8PkMgKzZw3HEB5gY2BrJXQT73kE/JywSmZhq4rDpCaYFHHTZ9skHlu7guP8ULFWTInGoAchkyDBZ9bithI4lqkufJzJcaPP64JpOrQgYpaNH2uUWe885LHM+IKc1dEo7+tqFleamf+2uljMS4uKwthoia0LTTZ6B95wBgWyBYuYYc/mKTgI/rl/FKbvY+5fxOgNuxMCKzMW2J2ja62y+ScPZWrdr4yQBTMxe2SHSEAU1LpffADbM1ftfhIIqbBdhwgwDjdYAslfZSIP8RyA+lUvSo5vONEo42mJZELVekamS2UqoLASdDc42QTPTCMl2QIZOqedAdoBXmQL5MVEhpkkHGwUReqoftjhJpreZdZ6+eieOdVpEn9whqQ8ZzOIn5OrxQKwHmk2ZNlGkMu0FOx++cj5toX/iWox4tNjIBkJVqZA18RDOvwMaLailJfKhjNjfb6lqe53kJIp5RqU4alyfRPE70okZpMi7D0ejRVgqbA82gA9r6KCodaUKrxpmPUaqTITCtOyjVjTDPgvvrcgIBDgZSmwvA2kBcDuLEDHpSJJMNsrgXczhCM5Q9F9DW8hkDyI6WsDJVzdA9Eo4mGHXAPtKkBquVkvItq+yOVM/QMSvgdHz4Es91S9Nv2WSBZumL99DdMyTVCxS4pnGiZq8Radb/KTogG8Dnnka6y1JfV0o4/2K4yeMakdoVtHET675VN8xX02WbvyCV5uTjJEyms/9stWjpTQ1g7Qid9a7pJV6JF0MyYQ6qECHFJiTqAvj263JiOY9kHT/Hupv0czpT/yD8fl1U4AlywEsSf6ljnwbKR/B1+QgOzxVO/A/BhG+gYCCHzIUm07Wq5RCpXmnD51dP+TYPSWVOocRlsX2lyc1opGa+z7ckcdEBZs4hZNfgs1q7tQ24sZudfdZrGvE57+UmUk+1fDNe6iZLSfQMUR0Kuj9KZcGGC3GzLMZvSjv+9ZQ69/MQIr8MoK3G3W6LIfVB+utIX43XTdaTuPsdgNjJHPSIrU7RT/vrpeN1H9fTd9g+zPl/N37/CgQ25mQPkQb3zSUbdW4Yjgwz9D0DnnNgv30diXs+WNbR79ObYxXooxfBpa3F9zwHK6Q5V62w3ZPcgP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center/contain no-repeat}
@media(max-width:720px){.masthead .brand{font-size:19px}.masthead .brand-mark{width:38px;height:29px}}
/* Enlarged photos use as much of the window as they can. --fit-w is the width at which the 4:3 manifold photo fits both the window's width
   and height (150px covers the dialog's padding and header). Wide windows keep the details panel beside the photo (265px + gap); taller
   windows move it underneath (about 200px) so the photo gets the full width. The dialog shrinks to fit, so there are no bars beside the photo. */
.manifold-dialog{--fit-w:min(calc(96vw - 325px),calc((94vh - 150px) * 4 / 3));width:fit-content;max-width:96vw;max-height:94vh}
.manifold-dialog .expanded-photo-layout{grid-template-columns:var(--fit-w) 265px}
.manifold-dialog .expanded-photo-scroll{width:var(--fit-w);max-height:calc(94vh - 150px)}
.manifold-dialog .expanded-photo-scroll:not(.is-zoomed) .manifold-photo{width:var(--fit-w)}
@media(max-aspect-ratio:4/3){
.manifold-dialog{--fit-w:min(calc(96vw - 40px),calc((94vh - 350px) * 4 / 3))}
.manifold-dialog .expanded-photo-layout{grid-template-columns:var(--fit-w)}
.manifold-dialog .expanded-photo-scroll{max-height:calc(94vh - 350px)}
}
.photo-dialog:not(.manifold-dialog){max-width:96vw}
.photo-dialog .photo-dialog-scroll{max-height:calc(92vh - 170px)}
.photo-dialog .photo-dialog-scroll:not(.is-zoomed) img{max-height:calc(92vh - 170px)}

/* Keep the shared navigation readable with the 3D View page. */
.masthead nav{flex-wrap:wrap;gap:8px 20px}
@media(max-width:650px){.masthead nav{gap:6px 14px}}

/* Reported tank capacities, with room for uncertainty on narrow screens. */
.tank-capacities{margin:0 0 28px;scroll-margin-top:64px}
.capacity-table{width:100%;max-width:820px;border-collapse:collapse;font-size:14px;text-align:left}
.capacity-table th,.capacity-table td{padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:top}
.capacity-table thead{background:var(--pale)}
.capacity-table tbody th{font-weight:600}
@media(max-width:420px){.capacity-table{font-size:12px}.capacity-table th,.capacity-table td{padding:9px 5px}}

.capacity-table caption{text-align:left;font-weight:600;color:var(--ink);padding-bottom:10px}
.written-reference{max-width:820px;font-size:14px;color:var(--body-text);scroll-margin-top:64px}
.src.written-source::before{display:none}