@font-face{font-family:BookHeading;src:local('Georgia');font-display:swap}
:root{--ink:#263f33;--muted:#637363;--paper:#faf8ef;--line:#d6d7c7;--gold:#b38d4c;--blue:#366c82}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#eceee3;background-image:linear-gradient(#435a3c06 1px,transparent 1px),linear-gradient(90deg,#435a3c06 1px,transparent 1px);background-size:24px 24px;font:16px/1.65 Arial,sans-serif}a{color:inherit;text-underline-offset:4px}button{font:inherit;cursor:pointer}button:disabled{opacity:.4;cursor:default}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--blue);outline-offset:5px}button,a{-webkit-tap-highlight-color:transparent}.skip{position:absolute;top:-100px;left:12px;z-index:9;background:white;padding:10px}.skip:focus{top:12px}.case-header,.case-footer{max-width:1240px;margin:auto;padding:24px 32px;display:flex;justify-content:space-between;align-items:center;gap:20px}.case-header{border-bottom:1px solid 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p{font-size:14px;line-height:1.7;margin:15px 0}.page-copy .intro{font-size:17px;line-height:1.55}.source-link{display:inline-block;font-size:11px;line-height:1.5;margin:5px 13px 4px 0;color:var(--muted);border-bottom:1px solid #a9b59d;text-decoration:none}.source-link:hover{color:var(--ink)}.facts{display:flex;gap:27px;margin:28px 0}.facts b{display:block;font:36px/1.2 Georgia,serif}.facts span{font-size:11px;color:var(--muted)}.margin-note{border-left:2px solid var(--gold);padding-left:16px;color:#746347;font-style:italic}.hero-drawing svg{width:100%;height:auto;max-height:420px;display:block;overflow:visible}.figure-note{font-size:11px;line-height:1.6;color:var(--muted);margin:22px 0 10px}.folio{position:absolute;bottom:17px;right:25px;font-size:8px;letter-spacing:1.7px;color:#87917e}.callout{border-left:3px solid var(--gold);background:#efeddf;padding:13px 17px;margin:22px 0;font-size:14px}.diagram-caption{margin:0 0 24px;color:var(--muted)}.bore-comparison{display:flex;gap:45px;justify-content:space-around;max-width:380px;margin:auto;width:100%}.bore-column{flex:1;max-width:70px;text-align:center;font-size:11px}.bore-column strong{display:block;margin-bottom:14px}.bore-column>span{display:block;margin-top:9px}.bore-track{height:310px;position:relative;outline:1px solid #766a51;background:#e0c899}.stratum{position:absolute;width:100%}.soil-1{background:#586547}.soil-2{background:repeating-linear-gradient(135deg,#a58b6b 0 10px,#9b805f 10px 11px)}.soil-3{background:repeating-linear-gradient(135deg,#c1a58c 0 12px,#b5957d 12px 13px)}.soil-4{background-color:#e0c899;background-image:radial-gradient(#8d784e 1px,transparent 1px);background-size:9px 9px}.water-mark{position:absolute;left:-9px;right:-9px;border-top:2px dashed var(--blue);z-index:1}.water-mark span{position:absolute;top:-23px;right:-10px;font-size:10px;background:#f7fbfc;border:1px solid #9cb8c0;border-radius:3px;padding:0 3px;color:#235166}.legend{display:grid;grid-template-columns:1fr 1fr;gap:8px 14px;font-size:10px;margin-top:25px}.legend span{display:flex;gap:7px;align-items:center}.legend i{width:13px;height:13px;flex-shrink:0;border:1px solid #887a60}.bore-tabs{display:none;gap:8px;margin-bottom:22px}.enhanced .bore-tabs{display:flex}.bore-tabs button{background:transparent;color:var(--ink);border:1px solid #a8b49d;padding:10px 16px;font-size:12px}.bore-tabs [aria-pressed=true]{background:var(--ink);color:var(--paper)}.bore-detail h3{font:26px Georgia,serif;margin:0 0 14px}.water-note{font-size:12px;color:var(--blue);background:#e6eef0;padding:10px 12px}table{width:100%;border-collapse:collapse;font-size:13px}th,td{text-align:left;padding:12px 6px;border-bottom:1px solid var(--line)}th{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}td:first-child{white-space:nowrap;width:90px}.water-scene{padding:25px 10px;text-align:center;border-top:2px solid #708166;background:linear-gradient(#fbfaf400 0 27%,#e5eff0 27%,#ccdee0 100%);position:relative}.water-scene .diagram-caption{font-size:9px}.water-depth{padding:35px 0 20px}.water-depth span{font:68px/1.15 Georgia,serif;color:#386879;display:block}.water-depth b{font-size:14px;font-weight:400;color:#386879}.water-ripple{height:2px;margin:0 20px;background:repeating-linear-gradient(90deg,#719da8 0 10px,transparent 10px 15px)}.water-scene>p{font-size:12px;color:#456c73;margin-top:23px}.water-readings{display:flex;justify-content:space-around;gap:10px;font-size:10px;color:#456c73;margin-top:28px}.water-readings b{display:block;font-size:18px}.lab-card{margin:12px 0 24px;border-bottom:1px solid var(--line);padding:20px 0}.lab-card>span{font-size:12px}.lab-card strong{display:block;font:60px/1.2 Georgia,serif;margin:16px 0}.lab-card small{font:16px Arial,sans-serif}.lab-bar{height:9px;width:var(--bar);background:#6d8061}.lab-card:nth-of-type(3) .lab-bar{background:#ac997a}.result-list{padding-left:20px;font-size:14px;line-height:1.8}.case-actions{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:24px}.case-actions>a:last-child{font-size:12px}.case-button{display:inline-block;background:var(--ink);color:var(--paper);padding:13px 18px;text-decoration:none;font-size:13px}.report-stack{padding:30px 20px;transform:rotate(3deg)}.report-paper{box-shadow:7px 7px 0 #e2e3d6,8px 8px 0 #bfc5b6,15px 15px 0 #ebecdf,16px 16px 0 #bfc5b6;border:1px solid #9da58e;padding:30px 25px;background:#f5f3e8;min-height:330px}.report-paper>span{font-size:8px;letter-spacing:2px}.report-paper h3{font:38px/1.15 Georgia,serif;margin:40px 0}.report-paper p{font-size:11px;line-height:1.9}.report-paper>b{font-size:12px}.report-lines{height:33px;background:repeating-linear-gradient(transparent 0 9px,#c7cdbd 9px 10px)}.book-controls{max-width:1180px;margin:24px auto 38px;padding:0 8px;display:flex;align-items:center;justify-content:space-between;gap:10px}.book-controls button{border:1px solid #a3b098;padding:12px 26px;background:#f8f8f0;color:var(--ink);font-size:13px;min-width:115px}.book-controls button:last-child{background:var(--ink);color:var(--paper)}#book-progress{font-size:12px;color:var(--muted)}.case-context{max-width:900px;margin:45px auto;padding:0 25px;font-size:13px;color:var(--muted)}.case-context h2{font-size:16px;color:var(--ink)}.case-context a{font-size:12px}.case-footer{border-top:1px solid #bdc6b7;font-size:12px;flex-wrap:wrap}.enhanced .book-page{margin-bottom:0}.book-page.arriving{animation:page-in .45s ease both}.book-page.arriving .bore-track{animation:reveal .9s ease both}.book-page.arriving .lab-bar{animation:grow .7s ease both;transform-origin:left}.book-page.arriving .hero-drawing{animation:page-in .8s ease both}@keyframes page-in{from{opacity:.2;transform:translateY(9px) rotateY(-2deg)}to{opacity:1;transform:none}}@keyframes reveal{from{clip-path:inset(0 0 100% 0)}to{clip-path:inset(0)}}@keyframes grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}#source-dialog{width:min(1050px,96vw);max-height:94dvh;padding:20px;background:var(--paper);border:1px solid #acb49e;color:var(--ink)}#source-dialog::backdrop{background:#15251dcc}.source-head{display:flex;align-items:center;justify-content:space-between;gap:15px;position:sticky;top:-20px;background:var(--paper);padding:12px 0}.source-head h2{font-size:15px;margin:0}.source-head button{border:1px solid #a7b49b;padding:8px 14px;background:white;font-size:13px}#source-image{display:block;width:100%;height:auto}#source-direct{font-size:13px}
@media(max-width:900px){.book{margin:0 18px}.page-copy,.page-visual{padding:30px 28px 42px}.facts{gap:20px}.bore-comparison{gap:35px}.book-controls{margin-inline:18px}.chapter-nav a{padding:10px 6px}.chapter-nav span{margin-right:5px}}
@media(max-width:650px){.case-header{padding:18px 20px}.case-brand{font-size:21px}.case-header>a:last-child{font-size:11px}.book-intro{margin-top:28px}.book-intro>p:last-child{max-width:280px;margin-inline:auto}.chapter-nav{overflow-x:auto;justify-content:flex-start;padding:0 18px;gap:12px;scrollbar-width:thin}.chapter-nav a{padding:12px 2px;flex-shrink:0}.book{margin:0 12px}.book-page{display:block;border-radius:3px 8px 8px 3px;min-height:0}.page-copy,.page-visual{padding:28px 24px 38px}.page-copy{background:none}.page-copy h2{font-size:32px;margin-top:16px}.page-visual{border-left:0;border-top:1px dashed #bec5b2;min-height:340px}.hero-drawing svg{max-height:320px}.page-copy .intro{font-size:16px}.page-copy p{font-size:14px}.facts{justify-content:space-between;gap:12px}.facts b{font-size:32px}.book-controls{position:sticky;bottom:0;z-index:4;background:#eceee3f5;margin:12px 0 25px;padding:12px 14px;border-top:1px solid #c5cebb}.book-controls button{padding:10px 16px;min-width:95px}#book-progress{font-size:11px}.bore-comparison{max-width:300px;gap:45px}.bore-track{height:280px}.legend{max-width:350px}.case-context{margin-top:25px}.case-footer{padding:20px}.report-stack{max-width:340px;margin:auto;width:100%}.water-depth span{font-size:58px}.source-head h2{font-size:12px}.source-head button{white-space:nowrap;font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{.book-page[hidden],.bore-detail[hidden]{display:block!important}.book-page{break-before:page;box-shadow:none}.chapter-nav,.book-controls,.bore-tabs,.source-link{display:none!important}.page-copy,.page-visual{padding:20px}.case-header{position:static}}

@media(max-width:650px){.source-link{display:inline-flex;align-items:center;min-height:44px;font-size:13px}.bore-tabs button,.source-head button{min-height:44px}.case-header>a:last-child{display:inline-flex;align-items:center;min-height:44px;font-size:13px}}