:root{--cert-navy:#06172d;--cert-teal:#008f95;--cert-dark:#054c54;--cert-pale:#e9f7f7;--cert-line:#cbd9df;--cert-ink:#10233b;--cert-muted:#5d7188;--cert-gold:#d9a62e}
*{box-sizing:border-box}
body.certification-page{margin:0;background:#edf2f5;color:var(--cert-ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.55}
button,input{font:inherit}
.cert-topbar{height:78px;background:var(--cert-navy);display:flex;align-items:center;justify-content:space-between;padding:0 clamp(18px,4vw,54px);color:#fff}
.cert-brand{display:flex;align-items:center;gap:11px;color:#fff;text-decoration:none}.cert-brand img{width:43px;height:43px;filter:brightness(0) invert(1)}.cert-brand strong,.cert-brand small{display:block}.cert-brand strong{font-size:1rem;letter-spacing:.02em}.cert-brand b{color:#4bd0ce}.cert-brand small{font-size:.72rem;color:#b7c8d9}
.cert-return{color:#fff;text-decoration:none;border:1px solid rgba(255,255,255,.35);border-radius:9px;padding:9px 14px;font-weight:800;font-size:.86rem}.cert-return:hover,.cert-return:focus-visible{background:#fff;color:var(--cert-navy)}
#cert-main{max-width:1320px;margin:auto;padding:28px clamp(15px,3vw,36px) 52px}
.cert-hero{min-height:320px;border-radius:22px;padding:42px clamp(25px,5vw,68px);display:flex;justify-content:space-between;align-items:center;gap:30px;color:#fff;background:linear-gradient(120deg,rgba(1,46,51,.98),rgba(0,118,125,.88));box-shadow:0 16px 40px rgba(5,32,47,.18)}
.cert-kicker{font-size:.76rem;letter-spacing:.17em;font-weight:900;color:#90f0ec;margin:0 0 12px}.cert-hero h1{font-size:clamp(2rem,4vw,3.8rem);line-height:1.04;margin:0;letter-spacing:-.045em}.cert-purpose{max-width:760px;font-size:1rem;margin:21px 0 0;color:#d9f1f1}
.cert-seal{width:190px;height:190px;flex:0 0 190px;border:7px double rgba(255,255,255,.72);border-radius:50%;display:grid;place-content:center;text-align:center;box-shadow:inset 0 0 0 7px rgba(255,255,255,.12)}.cert-seal span{font-size:2.4rem;font-weight:950;letter-spacing:.05em}.cert-seal small{font-size:.58rem;letter-spacing:.16em;border-top:1px solid rgba(255,255,255,.55);padding-top:8px}
.cert-tabs{display:flex;gap:8px;margin:20px 0;padding:8px;background:#fff;border:1px solid var(--cert-line);border-radius:14px;box-shadow:0 5px 18px rgba(6,23,45,.05);overflow-x:auto}.cert-tabs button{border:0;background:transparent;color:#40546a;padding:11px 17px;border-radius:9px;font-weight:850;cursor:pointer;white-space:nowrap}.cert-tabs button:hover,.cert-tabs button.active{background:var(--cert-pale);color:var(--cert-dark)}
.cert-panel{background:#fff;border:1px solid var(--cert-line);border-radius:20px;padding:clamp(21px,4vw,40px);box-shadow:0 10px 30px rgba(6,23,45,.06)}
.panel-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:25px}.panel-heading h2{font-size:clamp(1.65rem,3vw,2.45rem);line-height:1.12;margin:0}.panel-heading p{margin:8px 0 0;color:var(--cert-muted);max-width:760px}
.overview-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:20px}.info-card{border:1px solid var(--cert-line);border-radius:15px;padding:22px;background:#fbfdfe}.info-card h3{margin:0 0 12px;font-size:1.13rem}.info-card p{color:var(--cert-muted)}
.path-list{display:grid;gap:10px;margin-top:14px}.path-step{display:grid;grid-template-columns:42px 1fr;gap:13px;align-items:start;padding:13px;border-radius:11px;background:#f2f7f8}.path-step b:first-child{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--cert-dark);color:#fff}.path-step strong,.path-step small{display:block}.path-step small{color:var(--cert-muted);margin-top:2px}
.level-table{width:100%;border-collapse:collapse}.level-table th,.level-table td{text-align:left;padding:11px 9px;border-bottom:1px solid #dce5ea}.level-table th{font-size:.72rem;letter-spacing:.08em;color:var(--cert-muted)}
.privacy-note{margin-top:20px;border-left:5px solid var(--cert-teal);padding:15px 18px;background:var(--cert-pale);border-radius:4px 12px 12px 4px}.privacy-note strong{display:block}.privacy-note p{margin:3px 0 0;color:#355e64}
.primary-button,.secondary-button{border:0;border-radius:10px;padding:11px 17px;font-weight:900;cursor:pointer}.primary-button{background:var(--cert-dark);color:#fff}.primary-button:hover,.primary-button:focus-visible{background:#02353b}.secondary-button{background:#edf3f5;color:var(--cert-ink);border:1px solid var(--cert-line)}.secondary-button:hover{background:#e1ecef}.button-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.domain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.domain-card{border:1px solid var(--cert-line);border-radius:15px;padding:20px;display:flex;flex-direction:column;background:#fbfdfe}.domain-number{font-size:.69rem;font-weight:950;letter-spacing:.13em;color:var(--cert-teal)}.domain-card h3{margin:7px 0 8px;font-size:1.15rem}.domain-card p{margin:0;color:var(--cert-muted);font-size:.92rem}.domain-card ul{padding-left:19px;margin:14px 0;color:#344b61;font-size:.9rem}.domain-card button{margin-top:auto;align-self:flex-start}
.practice-controls{display:grid;grid-template-columns:minmax(220px,1fr) auto;gap:12px;align-items:end;padding:18px;background:#f4f8f9;border-radius:13px;margin-bottom:20px}.practice-controls label{font-weight:850}.practice-controls select{display:block;width:100%;margin-top:6px;border:1px solid #aec2cb;border-radius:9px;padding:10px;background:#fff}
.question-shell{max-width:870px;margin:auto}.question-meta{display:flex;justify-content:space-between;gap:15px;color:var(--cert-muted);font-size:.83rem;font-weight:800;margin-bottom:11px}.question-shell h3{font-size:clamp(1.25rem,2.5vw,1.7rem);line-height:1.35;margin:0 0 20px}.answer-list{display:grid;gap:10px}.answer-option{display:grid;grid-template-columns:31px 1fr;gap:11px;align-items:center;width:100%;text-align:left;padding:14px;border:1px solid #bdccd3;border-radius:11px;background:#fff;color:var(--cert-ink);cursor:pointer}.answer-option:hover:not(:disabled){border-color:var(--cert-teal);background:#f0fafa}.answer-option span:first-child{width:29px;height:29px;border-radius:50%;display:grid;place-items:center;background:#e9f0f3;font-weight:900}.answer-option.correct{border-color:#23845e;background:#eaf8f1}.answer-option.incorrect{border-color:#b44f4f;background:#fff0f0}.answer-option:disabled{cursor:default;color:inherit}.feedback-box{margin-top:17px;padding:16px 18px;border-radius:12px;background:#edf5f6;border-left:5px solid var(--cert-teal)}.feedback-box strong{display:block}.feedback-box p{margin:4px 0 0}.progress-track{height:9px;background:#dfe8eb;border-radius:99px;overflow:hidden;margin:0 0 25px}.progress-track i{display:block;height:100%;background:var(--cert-teal);width:0;transition:.25s}
.exam-brief{display:grid;grid-template-columns:1fr 1fr;gap:18px}.exam-rule{padding:18px;border:1px solid var(--cert-line);border-radius:13px;background:#fbfdfe}.exam-rule strong{display:block;margin-bottom:4px}.exam-rule span{color:var(--cert-muted)}
.exam-warning{margin-top:18px;padding:15px 18px;background:#fff8e6;border:1px solid #ead394;border-radius:11px;color:#674d0f}
.result-hero{text-align:center;padding:12px 0 25px}.result-score{width:150px;height:150px;border-radius:50%;margin:0 auto 18px;display:grid;place-content:center;background:var(--cert-pale);border:8px solid var(--cert-teal)}.result-score strong{font-size:2.35rem;line-height:1}.result-score small{font-weight:850;color:var(--cert-muted)}.result-hero h2{font-size:2rem;margin:0}.result-hero p{color:var(--cert-muted)}
.domain-results{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.domain-result{padding:12px;border:1px solid var(--cert-line);border-radius:10px}.domain-result strong,.domain-result span{display:block}.domain-result span{font-size:.84rem;color:var(--cert-muted)}
.certificate-form{max-width:650px;margin:22px auto 0;padding:20px;background:#f2f7f8;border-radius:14px;text-align:left}.certificate-form label{display:block;font-weight:850}.certificate-form input{width:100%;border:1px solid #aebfc8;border-radius:9px;padding:11px;margin:6px 0 12px;background:#fff}.certificate-form small{color:var(--cert-muted)}
.print-certificate{display:none}
.chapter-header{display:flex;justify-content:space-between;gap:24px;align-items:flex-start;padding-bottom:24px;border-bottom:1px solid var(--cert-line)}.chapter-header h2{font-size:clamp(2.25rem,5vw,3.8rem);line-height:1;margin:7px 0 12px;letter-spacing:-.045em}.chapter-header p{max-width:760px;color:var(--cert-muted);font-size:1.08rem;margin:0}.reading-time{white-space:nowrap;padding:8px 12px;border-radius:999px;background:var(--cert-pale);color:var(--cert-dark);font-size:.78rem;font-weight:900}
.chapter-opener{margin:24px 0;padding:28px;border-radius:16px;background:linear-gradient(120deg,#062d3b,#08727a);color:#fff}.chapter-opener h3{font-family:Georgia,serif;font-size:clamp(1.55rem,3vw,2.15rem);margin:4px 0 10px}.chapter-opener>p:last-child{max-width:920px;margin:0;color:#e0f1f2;font-size:1.04rem}
.learning-targets{display:grid;grid-template-columns:220px 1fr;gap:25px;padding:23px 26px;border:1px solid var(--cert-line);border-radius:14px;background:#f7fafb}.learning-targets h3{margin:0;font-size:1.15rem}.learning-targets ul{columns:2;column-gap:34px;margin:0;padding-left:20px}.learning-targets li{break-inside:avoid;margin:0 0 8px}
.textbook-section{display:grid;grid-template-columns:58px minmax(0,1fr) minmax(260px,.56fr);gap:25px;padding:38px 0;border-bottom:1px solid var(--cert-line)}.section-marker{font-weight:950;color:var(--cert-teal);font-size:.8rem;letter-spacing:.08em;padding-top:8px}.section-reading h3{font-family:Georgia,serif;font-size:clamp(1.6rem,3vw,2.1rem);line-height:1.15;margin:0 0 14px;color:var(--cert-navy)}.section-reading>p{margin:0 0 14px;color:#31485d;font-size:1rem;line-height:1.72}.tank-callout{margin-top:19px;padding:16px 18px;border-left:5px solid var(--cert-teal);background:var(--cert-pale);border-radius:4px 10px 10px 4px}.tank-callout strong{font-size:.7rem;letter-spacing:.11em;color:var(--cert-dark)}.tank-callout p{margin:4px 0 0;color:#284f55}
.chapter-figure{align-self:start;margin:0;background:#eef7f8;border:1px solid #a9c9cc;border-radius:15px;padding:16px;box-shadow:0 8px 20px rgba(6,47,57,.07)}.chapter-figure figcaption{margin-top:12px;color:#4e6973;font-size:.78rem;line-height:1.45}.system-box{min-height:260px;display:grid;grid-template-columns:repeat(3,1fr);gap:7px;align-content:start;text-align:center}.outside-label{grid-column:1/-1;font-size:.68rem;font-weight:950;letter-spacing:.12em}.system-box i{background:#fff;border:1px solid #8cb6ba;padding:7px;font-style:normal;border-radius:8px;font-size:.78rem}.tank-box{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:6px;padding:15px;border:3px solid #08727a;background:#d7f1f2;border-radius:10px}.tank-box strong{grid-column:1/-1}.tank-box span{background:#fff;padding:6px;border-radius:6px;font-size:.75rem}.system-box>b{grid-column:span 3;background:#0b5961;color:#fff;padding:7px;border-radius:8px;font-size:.76rem}
.capacity-stack{display:flex;flex-direction:column-reverse;gap:5px;text-align:center}.capacity-stack>*{padding:9px;border-radius:7px;background:#fff;border:1px solid #9ebfc2;font-style:normal}.capacity-stack strong{background:#07545a;color:#fff;border:0}.capacity-stack em{background:transparent;border:0;color:#47656b;font-size:.78rem;padding:0 0 5px}
.location-grid{display:grid;grid-template-columns:1fr 1.3fr;grid-template-rows:1fr 1fr;gap:9px;min-height:240px}.location-grid>span{display:grid;place-content:center;text-align:center;border-radius:9px;padding:8px;font-weight:900}.location-grid small{font-weight:600}.window-cell{background:#fff4a8;border:1px solid #d3b642}.tank-cell{grid-row:1/3;grid-column:2;background:#bde9ec;border:3px solid #08727a}.traffic-cell{background:#e7e9ec;border:1px dashed #7e8996}.outlet-cell{grid-column:1/-1;background:#17344c!important;color:#fff}
.habitat-tank{position:relative;min-height:270px;border:5px solid #08727a;border-top:14px solid #08727a;background:linear-gradient(#dff7fa,#b5e5e9 68%,#a99c7e 68%);overflow:hidden}.habitat-tank span{position:absolute;font-size:.65rem;font-weight:950;padding:5px 7px;border-radius:6px}.surface-route{top:8px;left:8px;background:#fff}.swim-route{top:42%;left:9%;right:9%;text-align:center;background:rgba(255,255,255,.75);color:#07545a}.plant-break{left:44%;bottom:32%;background:#3d7f63;color:#fff;text-align:center}.cave-one,.cave-two{bottom:9px;background:#405c59;color:#fff;border-radius:22px 22px 5px 5px!important}.cave-one{left:7%}.cave-two{right:7%}.bottom-route{bottom:8px;left:40%;background:#fff}
.calculation-card{margin:30px 0;padding:25px;border:2px solid #0a7379;border-radius:16px;background:#f5fbfb}.calculation-card h3{font-family:Georgia,serif;font-size:1.65rem;margin:4px 0}.calculation-card>div>p:last-child{margin:0;color:var(--cert-muted)}.calculation-table-wrap{overflow-x:auto;margin:17px 0}.calculation-card table{width:100%;border-collapse:collapse;background:#fff}.calculation-card th,.calculation-card td{padding:12px;border:1px solid #bfd0d5;text-align:left}.calculation-card th{background:#0b5961;color:#fff}.calculation-card tbody tr:last-child{font-weight:950;background:#e4f4f4}.calculation-analysis{margin:0;color:#294b52;line-height:1.65}
.chapter-checks{margin:30px 0;padding:26px;border-radius:17px;background:#071b35;color:#fff}.chapter-checks-head h3{font-size:1.65rem;margin:4px 0}.chapter-checks-head>p:last-child{margin:0;color:#bacada}.inline-check{padding:20px 0;border-top:1px solid rgba(255,255,255,.16)}.inline-check:first-of-type{margin-top:17px}.inline-check h4{font-size:1.02rem;margin:0 0 12px}.inline-options{display:grid;grid-template-columns:1fr 1fr;gap:8px}.inline-options button{border:1px solid rgba(255,255,255,.28);border-radius:9px;background:rgba(255,255,255,.08);color:#fff;padding:11px;text-align:left;cursor:pointer}.inline-options button:hover:not(:disabled){background:rgba(255,255,255,.16)}.inline-options button.correct{background:#176b50;border-color:#74d7ac}.inline-options button.incorrect{background:#8a3439;border-color:#e8989c}.inline-feedback{margin-top:10px;color:#dfeef3}.inline-feedback strong{color:#7ce2bd}
.chapter-summary{margin:28px 0;padding:26px;border-radius:15px;background:#fff8e8;border:1px solid #e3ca8a}.chapter-summary h3{font-family:Georgia,serif;font-size:1.65rem;margin:4px 0 12px}.chapter-summary ul{margin:0;padding-left:22px;columns:2;column-gap:35px}.chapter-summary li{break-inside:avoid;margin-bottom:9px}
.sr-status{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
.module-back{border:0;background:transparent;color:var(--cert-dark);font-weight:900;padding:0;cursor:pointer;margin-bottom:24px}.module-back:hover{text-decoration:underline}
.module-title{max-width:900px}.module-title h2{font-size:clamp(2rem,4vw,3.1rem);line-height:1.05;margin:7px 0 12px;letter-spacing:-.035em}.module-title p{font-size:1.08rem;color:var(--cert-muted);margin:0}
.concept-diagram{margin:28px 0;border:1px solid #a9c7ca;border-radius:16px;background:linear-gradient(135deg,#eefafa,#f8fcfc);min-height:130px;padding:20px;color:#073f45}
.process-diagram{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}.process-diagram span{background:#fff;border:1px solid #83b6ba;border-radius:10px;padding:12px 15px;font-weight:900}.process-diagram b{font-size:1.35rem;color:var(--cert-teal)}.process-diagram em{flex-basis:100%;text-align:center;color:var(--cert-muted);font-weight:800}
.zones-diagram{display:grid;grid-template-rows:repeat(3,1fr);position:relative;background:linear-gradient(#dff7fa 0 32%,#bde9ec 32% 68%,#9dd0c8 68%)}.zones-diagram b{display:flex;align-items:center;padding-left:14px;border-bottom:1px dashed rgba(7,63,69,.25)}.zones-diagram i{position:absolute;right:8%;bottom:10px;background:#315d52;color:#fff;border-radius:40px 40px 8px 8px;padding:14px 22px;font-style:normal;font-weight:900}
.matrix-diagram{display:grid;grid-template-columns:1fr 1fr 1.15fr 1fr 1fr;gap:8px;align-items:center;text-align:center}.matrix-diagram span{background:#fff;border:1px solid #83b6ba;border-radius:10px;padding:12px 7px;font-weight:850}.matrix-diagram strong{background:var(--cert-dark);color:#fff;border-radius:50%;aspect-ratio:1;display:grid;place-items:center;font-size:.75rem;padding:10px}
.lesson-sections{display:grid;gap:14px}.lesson-block{display:grid;grid-template-columns:54px 1fr;gap:18px;padding:21px;border:1px solid var(--cert-line);border-radius:14px;background:#fbfdfe}.lesson-block>span{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--cert-dark);color:#fff;font-size:.78rem;font-weight:950}.lesson-block h3{margin:0 0 7px;font-size:1.18rem}.lesson-block p{margin:0;color:#42596f}.lesson-block ul{margin:12px 0 0;padding-left:20px;color:#314b60}
.worked-scenario{margin:22px 0;padding:24px;border-radius:16px;background:var(--cert-navy);color:#fff}.scenario-label{margin:0;color:#69dedb;font-size:.7rem;font-weight:950;letter-spacing:.14em}.worked-scenario h3{font-size:1.45rem;margin:6px 0 18px}.evidence-chain{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.evidence-chain>div{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:11px;padding:15px}.evidence-chain strong{color:#8ff0ed}.evidence-chain p{margin:5px 0 0;color:#e2edf3}
.study-bottom-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:16px}.mistake-card,.vocab-card{border:1px solid var(--cert-line);border-radius:14px;padding:20px}.mistake-card{background:#fff8e9}.mistake-card h3,.vocab-card h3{margin:0 0 12px}.mistake-card ul{padding-left:20px;margin:0}.vocab-card dl{margin:0;display:grid;gap:10px}.vocab-card dl div{display:grid;grid-template-columns:135px 1fr;gap:10px;border-top:1px solid #e0e7eb;padding-top:9px}.vocab-card dl div:first-child{border:0;padding-top:0}.vocab-card dt{font-weight:900}.vocab-card dd{margin:0;color:var(--cert-muted)}
.module-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px;justify-content:space-between}
@media(max-width:900px){.cert-seal{width:145px;height:145px;flex-basis:145px}.overview-grid,.exam-brief,.evidence-chain,.study-bottom-grid{grid-template-columns:1fr}.domain-grid{grid-template-columns:1fr 1fr}.matrix-diagram{grid-template-columns:1fr 1fr}.matrix-diagram strong{grid-column:1/-1;grid-row:1;width:100px;justify-self:center}}
@media(max-width:620px){.cert-topbar{height:auto;min-height:70px;padding:10px 14px}.cert-brand small{display:none}.cert-return{font-size:.75rem;padding:8px 10px}.cert-hero{min-height:0;display:block;padding:30px 23px}.cert-seal{display:none}.domain-grid,.domain-results{grid-template-columns:1fr}.practice-controls{grid-template-columns:1fr}.cert-tabs button{flex:1}.cert-purpose{font-size:.92rem}.lesson-block{grid-template-columns:1fr}.lesson-block>span{width:36px;height:36px}.vocab-card dl div{grid-template-columns:1fr;gap:2px}.process-diagram{align-items:stretch;flex-direction:column}.process-diagram b{transform:rotate(90deg);align-self:center}.cycle-diagram em{flex-basis:auto}.module-actions>*{width:100%}}
@media(max-width:1050px){.textbook-section{grid-template-columns:50px 1fr}.chapter-figure{grid-column:2}}
@media(max-width:720px){.chapter-header{display:block}.reading-time{display:inline-block;margin-top:14px}.learning-targets{grid-template-columns:1fr}.learning-targets ul,.chapter-summary ul{columns:1}.textbook-section{grid-template-columns:1fr;gap:12px;padding:28px 0}.section-marker{padding:0}.chapter-figure{grid-column:1}.inline-options{grid-template-columns:1fr}.chapter-opener,.chapter-checks,.calculation-card{padding:20px}}

/* v0.6.41 textbook figures */
.figure-flow{display:flex;align-items:center;justify-content:center;gap:7px;min-height:210px;flex-wrap:wrap}.figure-flow span{background:#fff;border:1px solid #8cb6ba;border-radius:9px;padding:12px 10px;font-size:.72rem;font-weight:950;text-align:center;min-width:86px}.figure-flow b{color:#08727a;font-size:1.25rem}.figure-stack,.priority-stack,.log-lines{display:grid;gap:8px;min-height:210px;align-content:center}.figure-stack span,.priority-stack strong,.log-lines span{background:#fff;border:1px solid #9ebfc2;border-radius:8px;padding:10px;text-align:center;font-size:.76rem}.safety-cord{min-height:230px;display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto 1fr auto;gap:8px;align-items:center;text-align:center}.outlet-demo{grid-column:1/-1;background:#17344c;color:#fff;padding:12px;border-radius:8px;font-weight:950}.safety-cord b{background:#fff;border:1px solid #9ebfc2;padding:8px;border-radius:8px}.safety-cord i{font-style:normal;font-size:.75rem}.safety-cord strong{grid-column:1/-1;background:#0b5961;color:#fff;padding:13px;border-radius:0 0 40px 40px}.safety-cord em{grid-column:1/-1;font-size:.72rem}.trend-chart{min-height:240px;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:1fr auto auto;gap:6px;align-items:end}.trend-chart span{height:var(--h);min-height:45px;background:#0b5961;color:#fff;display:flex;align-items:flex-end;justify-content:center;padding:8px;border-radius:7px 7px 0 0;font-size:.72rem;font-weight:900}.trend-chart b,.trend-chart i{font-size:.68rem;font-style:normal}.trend-chart em{grid-column:1/-1;background:#fff;border:1px solid #9ebfc2;padding:8px;border-radius:7px;text-align:center;font-size:.7rem}.window-diagram{min-height:220px;display:grid;grid-template-columns:.7fr 1.6fr .7fr;gap:5px;align-items:center;text-align:center}.window-diagram span{background:#e9d9d9;padding:25px 5px;border-radius:8px;font-size:.7rem;font-weight:900}.window-diagram strong{background:#d7f1f2;border:3px solid #08727a;padding:35px 8px;border-radius:9px}.window-diagram i{grid-column:1/-1;font-size:.72rem;font-style:normal}.zone-body{display:grid;gap:8px;min-height:230px;align-content:center}.zone-body>*{padding:13px;border-radius:9px;text-align:center;background:#fff;border:1px solid #8cb6ba}.zone-body strong{background:#d7f1f2;border:2px solid #08727a}.zone-body small,.venn-compat small,.feed-tank small,.scope-grid small{font-weight:600}.venn-compat{min-height:230px;display:grid;grid-template-columns:1fr .85fr 1fr;align-items:center;text-align:center}.venn-compat span,.venn-compat strong{padding:28px 8px;border-radius:50%;margin:-5px;background:rgba(215,241,242,.9);border:2px solid #08727a;font-size:.72rem}.venn-compat strong{background:#0b5961;color:#fff;z-index:2}.resource-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;min-height:220px;align-content:center}.resource-grid span{background:#fff;border:1px solid #8cb6ba;padding:15px;text-align:center;border-radius:8px;font-weight:900;font-size:.75rem}.resource-grid strong{grid-column:1/-1;background:#0b5961;color:#fff;padding:12px;border-radius:8px;text-align:center;font-size:.75rem}.feed-tank{min-height:245px;border:5px solid #08727a;border-top:13px solid #08727a;background:linear-gradient(#dff7fa,#b5e5e9 72%,#9c8f72 72%);display:grid;grid-template-rows:1fr 1fr 1fr;align-items:center;text-align:center}.feed-tank>*{margin:auto;background:#fff;padding:7px 12px;border-radius:8px;font-style:normal;font-size:.72rem}.change-diagram{display:grid;grid-template-columns:1fr 1fr 1fr;gap:7px;min-height:220px;align-items:center;text-align:center}.change-diagram>*{background:#fff;border:1px solid #8cb6ba;padding:18px 7px;border-radius:8px;font-size:.72rem}.change-diagram strong{background:#d7f1f2;border:3px solid #08727a}.change-diagram b{display:block;margin-top:4px;font-weight:600}.log-lines strong{background:#0b5961;color:#fff;padding:10px;border-radius:8px;text-align:center;font-size:.75rem}.scope-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;min-height:220px;align-content:center;text-align:center}.scope-grid>*{padding:25px 8px;border-radius:9px;background:#fff;border:1px solid #8cb6ba;font-size:.75rem}.scope-grid strong{background:#d7f1f2;border:3px solid #08727a}.priority-stack strong:nth-child(1){background:#0b5961;color:#fff}.priority-stack span{text-align:center;font-size:.72rem;font-weight:800}@media(max-width:620px){.figure-flow{flex-direction:column}.figure-flow b{transform:rotate(90deg)}.venn-compat,.change-diagram,.window-diagram{grid-template-columns:1fr}.venn-compat>*{margin:0;border-radius:9px}.window-diagram i{grid-column:1}.change-diagram strong{order:-1}}
@media print{
  @page{size:landscape;margin:.35in}
  html,body{width:100%;height:100%;margin:0!important;padding:0!important;background:#fff!important}
  body.certification-page{-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .cert-topbar,.cert-footer,.cert-hero,.cert-tabs,#cert-workspace>.cert-panel{display:none!important}
  #cert-main,#cert-workspace{display:block!important;margin:0!important;padding:0!important;max-width:none!important;width:100%!important}
  .print-certificate{display:flex!important;position:static!important;width:100%!important;height:100%!important;min-height:7in;padding:0!important;align-items:center;justify-content:center;background:#fff!important}
  .certificate-paper{box-sizing:border-box;width:100%!important;min-height:7in;border:10px double #07545a;padding:34px 48px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;break-inside:avoid;page-break-inside:avoid;background:#fff!important}
  .certificate-paper>p:first-child{font-weight:900;letter-spacing:.18em;color:#07545a;font-size:18px;margin:0 0 8px}
  .certificate-paper h1{font-family:Georgia,serif;font-size:38px;line-height:1.05;color:#07394b;margin:8px 0 12px}
  .certificate-paper h2{font-family:Georgia,serif;font-size:32px;line-height:1.1;border-bottom:2px solid #234;padding:0 35px 7px;margin:12px 0 16px;min-width:55%}
  .certificate-paper .cert-print-level{font-size:24px;font-weight:900;color:#07545a;margin:10px 0}
  .certificate-paper p{max-width:780px;margin:8px auto;line-height:1.35}
  .certificate-paper small{margin-top:24px;font-size:11px;line-height:1.35}
}

/* v0.6.42 beginner-learning pass */
.classroom-bridge{margin:16px 0 26px;padding:17px 20px;border-left:5px solid #08727a;background:#eef8f8;border-radius:0 12px 12px 0;display:grid;grid-template-columns:180px 1fr;gap:16px;align-items:start}.classroom-bridge strong{font-size:.72rem;letter-spacing:.12em;color:#07545a}.classroom-bridge p{margin:0;color:#294b5b;font-weight:720;line-height:1.55}.teaching-figure{background:linear-gradient(145deg,#f7fcfc,#e7f3f4);border:1px solid #a9c8ca;box-shadow:0 9px 25px rgba(7,63,69,.08)}.teaching-figure figcaption{border-top:1px solid #bed5d6;margin-top:14px;padding-top:12px;font-weight:720;color:#385b67}
.waste-source-map{min-height:255px;display:grid;grid-template-columns:1fr 1.1fr 1.4fr;grid-template-rows:auto auto auto;gap:10px;align-items:center;text-align:center}.waste-source-map>*{border-radius:12px}.fish-input{background:#fff4cd;border:1px solid #d7b95c;padding:14px;font-weight:950}.fish-body{background:#dff4f4;border:3px solid #08727a;padding:25px 10px;font-weight:950;font-size:1.05rem}.waste-outs{display:grid;gap:6px}.waste-outs span{background:#fff;border:1px solid #b9caca;padding:8px;border-radius:8px;font-size:.74rem;font-weight:820}.waste-source-map>strong{grid-column:1/-1;color:#6b4f22}.ammonia-box{grid-column:1/-1;justify-self:center;background:#9a3f3f;color:#fff;padding:13px 28px;font-weight:950}.ammonia-box small{display:block;font-weight:650}
.nitrogen-path{min-height:175px;display:flex;align-items:center;justify-content:center;gap:7px;flex-wrap:wrap}.nitrogen-path span{padding:14px 11px;border-radius:11px;font-weight:950;text-align:center;min-width:82px}.nitrogen-path small{display:block;font-size:.62rem;margin-top:3px;font-weight:700}.nitrogen-path b{font-size:1.25rem;color:#08727a}.nitrogen-path .source{background:#8b6d48;color:#fff}.nitrogen-path .danger{background:#a94a4a;color:#fff}.nitrogen-path .bacteria{background:#295f67;color:#fff;border:2px dashed #9ce0dc}.nitrogen-path .safer{background:#527e4f;color:#fff}.bio-surface-note{background:#fff;border:1px dashed #6d9da1;border-radius:10px;padding:10px;text-align:center;font-size:.72rem;font-weight:780}
.cycle-timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;min-height:255px;align-items:stretch}.cycle-timeline div{position:relative;background:#fff;border:1px solid #aac4c5;border-radius:12px;padding:13px 10px;display:flex;flex-direction:column;justify-content:center;text-align:center}.cycle-timeline div:not(:last-child):after{content:'→';position:absolute;right:-15px;top:43%;z-index:3;color:#08727a;font-weight:950;font-size:1.2rem}.cycle-timeline strong{color:#073f45;font-size:.75rem}.cycle-timeline span{font-size:.69rem;margin:8px 0}.cycle-timeline i{font-style:normal;background:#eef7f7;border-radius:7px;padding:6px;font-size:.67rem;font-weight:900}
.test-decision{min-height:230px;display:grid;grid-template-columns:auto 30px auto;gap:10px;align-items:center;justify-content:center;text-align:center}.test-decision>span,.test-decision>strong{background:#fff;border:2px solid #08727a;padding:17px;border-radius:10px;font-size:.78rem}.test-decision>b{font-size:1.4rem;color:#08727a}.decision-branch{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:8px}.decision-branch i{font-style:normal;padding:12px;border-radius:9px;font-size:.7rem;font-weight:820}.decision-branch i:first-child{background:#e8f5e8;border:1px solid #8eb88c}.decision-branch i:last-child{background:#fff0e7;border:1px solid #dba581}
.feed-waste{min-height:235px;display:grid;grid-template-columns:.8fr 30px 1fr 1fr 30px 1.2fr;gap:7px;align-items:center;text-align:center}.feed-waste>*{border-radius:10px}.feed-waste>span{background:#fff4cd;border:1px solid #d7b95c;padding:17px 8px;font-weight:950}.feed-waste>div{background:#fff;border:1px solid #a9c8ca;padding:14px 8px}.feed-waste small{display:block;margin-top:5px}.feed-waste>b{color:#08727a;font-size:1.3rem}
.balance-board{display:grid;grid-template-columns:1fr 50px 1fr;gap:8px;align-items:center;min-height:220px}.balance-board>div{background:#fff;border:1px solid #a9c8ca;border-radius:12px;padding:15px;display:grid;gap:7px;text-align:center}.balance-board strong{color:#073f45}.balance-board span{padding:7px;background:#eef6f6;border-radius:7px;font-size:.72rem}.balance-board>b{text-align:center;font-size:2rem;color:#08727a}.balance-caption{text-align:center;margin:5px 0 0;font-weight:900;color:#7a4a21}
.maintenance-steps{min-height:255px;display:grid;grid-template-columns:repeat(5,1fr);gap:8px;align-items:center}.maintenance-steps span{background:#fff;border:1px solid #a9c8ca;border-radius:12px;padding:14px 8px;text-align:center;font-size:.72rem;font-weight:850}.maintenance-steps b{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:#07545a;color:#fff;margin:0 auto 8px}
.care-rhythm{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;min-height:240px}.care-rhythm>div{background:#fff;border:1px solid #a9c8ca;border-radius:12px;padding:13px;display:grid;align-content:start;gap:7px}.care-rhythm strong{background:#07545a;color:#fff;border-radius:8px;padding:8px;text-align:center;font-size:.72rem}.care-rhythm span{background:#eef7f7;padding:7px;border-radius:7px;font-size:.7rem;text-align:center}
.symptom-evidence{display:grid;grid-template-columns:1fr 50px 1.6fr;gap:8px;align-items:center;min-height:230px;text-align:center}.bad-label{background:#f5e1e1;border:2px solid #b26a6a;border-radius:12px;padding:25px 10px;font-weight:950}.good-evidence{background:#fff;border:3px solid #08727a;border-radius:12px;padding:18px 12px;font-weight:850;line-height:1.7}.symptom-evidence small{display:block;margin-top:7px;font-weight:650}.symptom-evidence>b{font-size:1.6rem;color:#08727a}
.scope-timeline{display:grid;grid-template-columns:1fr 1.5fr;gap:10px;min-height:240px}.scope-timeline>div{background:#fff;border:1px solid #a9c8ca;border-radius:12px;padding:14px;display:grid;align-content:start;gap:7px}.scope-timeline strong{background:#07545a;color:#fff;padding:8px;border-radius:7px;text-align:center;font-size:.72rem}.scope-timeline span{background:#eef7f7;padding:7px;border-radius:7px;text-align:center;font-size:.68rem}
.first-checks{display:grid;gap:8px;min-height:245px;align-content:center}.first-checks strong{background:#9a3f3f;color:#fff;padding:12px;border-radius:10px;text-align:center}.first-checks span{background:#fff;border:1px solid #a9c8ca;border-radius:9px;padding:9px 12px;font-size:.74rem;font-weight:850}.first-checks em{text-align:center;font-style:normal;font-size:.7rem;color:#526b72}
.diagnostic-loop{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap;min-height:245px}.diagnostic-loop span{background:#fff;border:1px solid #a9c8ca;border-radius:9px;padding:11px 8px;font-size:.69rem;font-weight:900;text-align:center}.diagnostic-loop b{color:#08727a}.diagnostic-loop strong{flex-basis:100%;text-align:center;background:#eef7f7;border-radius:8px;padding:8px;font-size:.7rem;color:#07545a}
@media(max-width:900px){.cycle-timeline{grid-template-columns:1fr 1fr}.cycle-timeline div:after{display:none}.maintenance-steps{grid-template-columns:1fr 1fr}.feed-waste{grid-template-columns:1fr}.feed-waste>b{transform:rotate(90deg)}.care-rhythm{grid-template-columns:1fr}.classroom-bridge{grid-template-columns:1fr}.nitrogen-path{flex-direction:column}.nitrogen-path b{transform:rotate(90deg)}}
@media(max-width:620px){.waste-source-map,.test-decision,.balance-board,.symptom-evidence,.scope-timeline{grid-template-columns:1fr}.decision-branch{grid-template-columns:1fr}.test-decision>b,.symptom-evidence>b,.balance-board>b{transform:rotate(90deg)}.cycle-timeline,.maintenance-steps{grid-template-columns:1fr}.waste-source-map>strong,.ammonia-box,.decision-branch{grid-column:1}}

/* v0.6.43 — textbook visual evidence system */
.textbook-section{align-items:start}
.section-visuals{display:grid;gap:14px;align-content:start;min-width:0}
.photo-figure{margin:0;border:1px solid #c8d8e4;border-radius:18px;overflow:hidden;background:#fff;box-shadow:0 8px 22px rgba(20,55,78,.08)}
.photo-figure .visual-label{display:block;padding:9px 12px;background:#eef5f8;color:#164c68;font-size:.73rem;font-weight:800;letter-spacing:.08em}
.photo-figure img{display:block;width:100%;height:auto;object-fit:cover;background:#eaf2f5}
.photo-figure:not(.anchor-plate) img{max-height:270px}
.photo-figure figcaption{padding:11px 13px 13px;color:#425d6b;font-size:.86rem;line-height:1.45;border-top:1px solid #e3edf2}
.comparison-images{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:#dbe7ed}
.comparison-images>div{background:#fff;min-width:0}
.comparison-images img{aspect-ratio:4/3;object-fit:cover;max-height:none!important}
.comparison-images strong{display:block;padding:8px 10px 10px;font-size:.78rem;line-height:1.25;color:#173e53}
.anchor-plate img{max-height:760px;object-fit:contain;background:#f8fbfc}
.anchor-plate figcaption{font-weight:600}
.section-visuals>.chapter-figure{margin:0}
@media (max-width:900px){.comparison-images{grid-template-columns:1fr}.photo-figure:not(.anchor-plate) img{max-height:360px}}


/* v0.6.46 — Domain 1 approved figure gallery + lightbox */
.textbook-section.has-visuals{grid-template-columns:58px minmax(0,1fr) minmax(310px,.72fr)}
.section-visuals{display:grid;gap:14px;align-content:start;min-width:0}
.figure-zoom{display:block;width:100%;padding:0;border:0;background:transparent;cursor:zoom-in}
.figure-zoom img{display:block;width:100%;height:auto;background:#f4fafb}
.photo-figure figcaption strong{display:block;margin-bottom:6px;color:#18384d;font-size:.84rem;letter-spacing:.02em}
.photo-figure figcaption span{display:block}
.photo-figure figcaption em{display:block;margin-top:8px;color:#0b5961;font-style:normal;font-weight:700;font-size:.78rem}
.cert-lightbox[hidden]{display:none!important}
.cert-lightbox{position:fixed;inset:0;z-index:9999;display:grid;place-items:center;padding:24px}
.cert-lightbox__scrim{position:absolute;inset:0;background:rgba(6,20,34,.78);backdrop-filter:blur(3px)}
.cert-lightbox__dialog{position:relative;z-index:1;max-width:min(1200px,96vw);max-height:92vh;background:#fff;border-radius:18px;box-shadow:0 30px 60px rgba(0,0,0,.35);padding:18px 18px 14px;display:grid;gap:12px}
.cert-lightbox__dialog img{display:block;max-width:100%;max-height:calc(92vh - 90px);width:auto;height:auto;border-radius:10px;background:#f8fbfc}
.cert-lightbox__close{position:absolute;top:10px;right:10px;width:42px;height:42px;border:0;border-radius:999px;background:#082c46;color:#fff;font-size:1.9rem;line-height:1;cursor:pointer}
#cert-lightbox-caption{margin:0;color:#3b5666;line-height:1.5;font-size:.95rem}
body.cert-modal-open{overflow:hidden}
@media(max-width:1050px){.textbook-section.has-visuals{grid-template-columns:50px 1fr}.textbook-section.has-visuals .section-visuals{grid-column:2}}
@media(max-width:720px){.textbook-section.has-visuals{grid-template-columns:1fr}.textbook-section.has-visuals .section-visuals{grid-column:1}}


/* v0.6.47 — Chromebook-first vertical textbook layout */
.textbook-section.has-visuals{grid-template-columns:58px minmax(0,1fr)}
.textbook-section.has-visuals .section-reading{min-width:0}
.textbook-section.has-visuals .section-visuals{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:22px;align-items:start}
.textbook-section.has-visuals .photo-figure{min-width:0}
.textbook-section.has-visuals .photo-figure img{max-height:none;aspect-ratio:auto;object-fit:contain}
.textbook-section.has-visuals .photo-figure figcaption{min-height:128px}
@media(max-width:900px){.textbook-section.has-visuals .section-visuals{grid-template-columns:1fr 1fr;gap:12px}.textbook-section.has-visuals .photo-figure figcaption{min-height:0}}
@media(max-width:700px){.textbook-section.has-visuals{grid-template-columns:1fr}.textbook-section.has-visuals .section-visuals{grid-template-columns:1fr}.textbook-section.has-visuals .section-marker{padding:0}.textbook-section.has-visuals .photo-figure img{max-height:none}}

/* v1.10 — certification exam completion */
.exam-identity{margin-top:20px;padding:20px;border:1px solid var(--cert-line);border-radius:14px;background:#f8fbfc}
.exam-identity h3{margin:0 0 6px}.exam-identity p{margin:0 0 14px;color:var(--cert-muted)}
.identity-grid{display:grid;grid-template-columns:2fr 1fr;gap:14px}.identity-grid label{display:grid;gap:6px;font-weight:800;color:#14394d}.identity-grid input,.identity-grid select{width:100%;box-sizing:border-box;border:1px solid #b7cbd7;border-radius:10px;background:#fff;padding:11px 12px;font:inherit;color:#17384a}.exam-identity small{display:block;margin-top:10px;color:var(--cert-muted)}
.certificate-preview{margin-top:24px;padding:32px;border:7px double #07545a;border-radius:10px;text-align:center;background:linear-gradient(#fff,#fbfdfd);box-shadow:0 14px 35px rgba(8,52,70,.09)}
.certificate-brand{font-weight:900;letter-spacing:.14em;color:#07545a;margin:0 0 10px}.certificate-kicker{font-family:Georgia,serif;font-size:1.35rem;font-weight:700;color:#07394b;margin:0}.certificate-preview h2{font-family:Georgia,serif;font-size:2rem;margin:22px auto 10px;border-bottom:2px solid #254b5b;max-width:620px;padding-bottom:8px}.cert-preview-level{font-size:1.35rem;font-weight:900;color:#07545a;margin:20px 0}.certificate-meta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:12px 0 18px}.certificate-meta span{padding:8px 11px;border:1px solid #c7dbe5;border-radius:999px;background:#f4fafb}.certificate-preview small{color:#526b78}
@media(max-width:700px){.identity-grid{grid-template-columns:1fr}.certificate-preview{padding:22px 16px}.certificate-preview h2{font-size:1.55rem}}

/* v0.6.60 — Certification content inside the shared Aquatic Science shell */
body.certification-page{background:#eef2f6}
.certification-page #cert-main.cert-specialty-workspace{max-width:none;margin:0;padding:0 0 12px}
.certification-page .cert-hero{min-height:275px;border-radius:15px;padding:34px 42px;background-image:linear-gradient(90deg,rgba(0,27,28,.94),rgba(0,38,38,.78) 44%,rgba(0,38,38,.24) 72%,rgba(0,38,38,.04)),url('/assets/freshwater-banner.jpg');background-size:cover;background-position:54% center;box-shadow:0 9px 24px rgba(5,23,50,.13);border:0}
.certification-page .cert-kicker{font-size:.68rem;letter-spacing:.13em;color:#70dfd7;margin-bottom:9px}
.certification-page .cert-hero h1{font-size:clamp(2.25rem,4vw,3.75rem);max-width:850px}
.certification-page .cert-purpose{max-width:680px;font-size:.94rem;line-height:1.5;margin-top:16px;color:#eef9f8}
.certification-page .cert-tabs{margin:16px 0;border-color:#d5dee9;border-radius:12px;box-shadow:0 5px 15px rgba(7,25,52,.045)}
.certification-page .cert-tabs button:hover,.certification-page .cert-tabs button.active{background:#e8f5f3;color:#075e61}
.certification-page .cert-panel{border-color:#d5dee9;border-radius:14px;box-shadow:0 8px 22px rgba(7,25,52,.07)}
@media(max-width:760px){.certification-page .cert-hero{min-height:260px;padding:28px 24px;background-position:62% center}.certification-page .cert-hero h1{font-size:2.35rem}}