:root{--navy:#122035;--ink:#1a2b41;--muted:#62728a;--teal:#087d72;--mint:#5ce0c7;--line:#dce4ed;--bg:#f3f6fa;--white:#fff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}button,select,input{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #1686e7;outline-offset:4px}header{height:84px;background:var(--navy);color:white;display:flex;align-items:center;justify-content:space-between;padding:0 4vw}.brand{font-size:19px;letter-spacing:2px;color:white;text-decoration:none;display:flex;gap:9px;align-items:center}.brand b{color:var(--mint)}.brandmark{background:var(--mint);color:var(--navy);width:35px;height:35px;display:grid;place-items:center;border-radius:9px;margin-right:6px}.edition{font-size:13px;letter-spacing:2px;color:#bdcbdc}.layout{max-width:1500px;margin:auto;display:grid;grid-template-columns:305px minmax(0,1fr)}aside{padding:35px 26px;border-right:1px solid var(--line)}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:750;color:var(--teal)}h1{font-size:28px;line-height:1.25;letter-spacing:-.7px}h1 span{color:var(--teal)}h2{font-size:25px;line-height:1.3;letter-spacing:-.5px;margin:8px 0}h3{font-size:19px;margin:6px 0}.muted,.small{color:var(--muted)}.small{font-size:13px}.muted{margin-bottom:24px}label{display:block;font-size:14px;font-weight:650;margin:15px 0 8px}select{padding:10px;border:1px solid #bccbda;border-radius:8px;background:white;color:var(--ink);max-width:100%;width:100%}#topiclist{margin-top:20px}#topiclist button{display:flex;justify-content:space-between;width:100%;border:0;text-align:left;background:transparent;color:var(--muted);padding:10px 8px;font-size:14px;border-radius:6px}#topiclist button.chosen{background:#dcefe9;color:#085b52;font-weight:700}.aside-note{border-left:3px solid var(--teal);padding:0 0 0 15px;margin-top:30px;font-size:14px}.aside-note p{color:var(--muted);margin:5px 0}main{padding:30px 38px;min-width:0}nav{display:flex;gap:8px;border-bottom:1px solid var(--line);margin-bottom:30px;flex-wrap:wrap}nav button{border:0;background:transparent;padding:10px 15px 17px;font-size:15px;color:var(--muted);border-bottom:3px solid transparent}nav button.active{border-color:var(--teal);color:var(--teal);font-weight:750}.row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.badge{background:#dfefe9;color:#086b5b;padding:5px 10px;border-radius:6px;font-size:13px;font-weight:650}.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.btn{border:1px solid #bccbda;border-radius:7px;padding:9px 16px;background:white;color:var(--ink);font-size:14px;font-weight:600}.btn:hover{border-color:var(--teal);background:#edf8f5}.btn.primary{background:var(--teal);border-color:var(--teal);color:white}.btn.dark{background:var(--navy);color:white;border-color:var(--navy)}.btn.selected{background:#dcefe9;border-color:var(--teal)}button:disabled{opacity:.45;cursor:default}.flash{width:100%;min-height:330px;background:var(--navy);border:0;border-radius:16px;color:white;padding:38px;text-align:left;box-shadow:0 15px 35px #12203512;display:flex;flex-direction:column;justify-content:space-between;transition:background .2s}.flash.answer{background:#e0f3ed;color:var(--ink);box-shadow:inset 0 0 0 1px #add8cb}.flash .side{font-size:12px;font-weight:750;letter-spacing:2px;color:var(--mint)}.flash.answer .side{color:var(--teal)}.flash .question{font-size:clamp(23px,2.5vw,32px);line-height:1.4;font-weight:650;max-width:760px;margin:25px 0;letter-spacing:-.4px}.flash.answer .question{font-size:23px;letter-spacing:0}.flash .hint{font-size:14px;opacity:.8}.meter{height:5px;background:#dce4ed;border-radius:4px;margin:20px 0;overflow:hidden}.meter span{display:block;background:var(--teal);height:100%}.controls{margin-top:20px}.keyhelp{font-size:13px;color:var(--muted);text-align:center}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:30px}.stat{border:1px solid var(--line);background:white;padding:15px;border-radius:9px}.stat b{font-size:24px;display:block}.stat span{font-size:13px;color:var(--muted)}.panel{background:white;border:1px solid var(--line);border-radius:13px;padding:25px;margin:20px 0}.options{display:grid;gap:10px;margin-top:25px}.option{text-align:left;border:1px solid #bccbda;background:white;padding:14px 17px;border-radius:8px;color:var(--ink)}.option .letter{display:inline-block;margin-right:15px;font-weight:750;color:var(--teal)}.option.correct{background:#d9f4e8;border:2px solid #14885f}.option.wrong{background:#fff0ef;border:2px solid #b34747}.feedback{padding:15px;background:#edf4f9;border-radius:8px;margin-top:20px}.feedback p{margin:3px 0}.diagram-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.diagram-grid .panel{margin:0;min-width:0}.wide{grid-column:1/-1}.gridlabels{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.gridlabels.two{grid-template-columns:repeat(2,minmax(0,1fr))}.labelbox{position:relative;background:#e6f3ef;border:1px solid #b8d6cc;border-radius:8px;padding:15px 8px;text-align:center;min-height:85px;display:flex;align-items:center;justify-content:center;font-size:14px}.labelbox input{width:100%;min-width:0;border:1px solid #abc0ce;border-radius:4px;padding:6px;font-size:14px;background:white}.labelbox.good{background:#d7f5dc}.labelbox.bad{background:#fff0dc}.flow{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap}.flow .step{flex:1;min-width:120px;text-align:center;background:#e6f3ef;padding:16px 10px;border-radius:7px;font-size:14px;border-top:3px solid var(--teal)}.flow .step b{display:block}.flow .arrow{align-self:center;color:var(--teal)}.return{border:2px solid var(--teal);border-top:0;padding:10px;margin:0 35px;text-align:center;font-size:14px;border-radius:0 0 10px 10px}.nest{border:1px solid #adc4d8;padding:12px;background:#f2f7fb;border-radius:8px;margin:8px 0;font-size:14px}.nest>strong{display:block;margin-bottom:5px}.nest .nest{background:white;margin-left:12px}.plane{display:grid;grid-template-columns:125px 1fr;gap:15px;align-items:center;margin:18px 0}.plane svg{width:125px;max-width:100%;height:105px}.plane p{font-size:14px;margin:0}.tablewrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:14px}td,th{padding:10px;border-bottom:1px solid var(--line);text-align:left}th{background:#edf5f6}.source-note{font-size:14px;color:var(--muted)}details{margin:12px 0}summary{cursor:pointer;font-weight:650}footer{font-size:12px;color:var(--muted);margin-top:45px;border-top:1px solid var(--line);padding-top:20px}a{color:var(--teal)}@media(max-width:950px){.layout{grid-template-columns:240px 1fr}main{padding:25px 22px}aside{padding:25px 18px}.diagram-grid{grid-template-columns:1fr}.wide{grid-column:auto}.flash{padding:26px}}@media(max-width:700px){header{height:68px;padding:0 20px}.edition{display:none}.layout{display:block}aside{padding:20px;border:0}h1{font-size:24px;margin:5px 0}h1 br{display:none}aside .muted,aside .eyebrow,#topiclist,.aside-note,aside>.small{display:none}aside label{margin-top:15px}main{padding:0 20px 30px}nav{gap:0;margin-bottom:20px}nav button{padding:10px 9px;font-size:14px}.flash{min-height:300px}.flash .question{font-size:24px}.flash.answer .question{font-size:21px}.stats{gap:8px}.stat{padding:10px}.controls .btn{padding:10px}.panel{padding:18px}.flow .step{min-width:90px}.gridlabels .labelbox{font-size:13px;padding:12px 4px}footer{margin-top:25px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}
.blank-input{width:100%;padding:13px 15px;border:1px solid #a6baca;border-radius:8px;font-size:18px;color:var(--ink)}.multi-option{display:flex;align-items:flex-start;gap:13px;margin:0;padding:14px;border:1px solid #bccbda;border-radius:8px;font-size:16px;font-weight:400;cursor:pointer}.multi-option input{width:20px;height:20px;flex-shrink:0;margin-top:3px;accent-color:var(--teal)}.tokenbank{border:1px dashed #9fb6c8;background:#f5f9fc;padding:15px;border-radius:9px}.tokenrow{display:flex;flex-wrap:wrap;gap:9px;margin-top:10px}.sort-token{padding:10px 13px;background:white;border:1px solid #9fb6c8;border-radius:7px;color:var(--ink);font-size:14px;text-align:left;cursor:grab}.sort-token.picked{outline:3px solid var(--teal);outline-offset:2px;background:#dff5ee}.sort-bins{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.drop-bin{border:2px dashed #a4c5be;border-radius:9px;padding:15px;min-height:150px;background:#f2faf7}.drop-bin h3{font-size:17px}.place-btn{margin-top:15px}.right-token{background:#d8f5e8!important;border-color:#14885f!important}.wrong-token{background:#fff0ef!important;border-color:#b34747!important}.sort-token:disabled,.option:disabled,.multi-option:has(input:disabled){opacity:1}.sort-token:disabled{cursor:default}#test-format{max-width:360px}@media(max-width:700px){.sort-bins{grid-template-columns:1fr}}
nav{row-gap:0}nav button{padding:10px 10px;font-size:14px}dd{margin:4px 0 18px;color:#465a72}.atlas-item img{display:block;max-width:100%;height:auto;background:white;margin:20px auto}.atlas-item summary{font-size:18px}.lab-figure{display:block;width:auto;max-width:100%;max-height:600px;margin:auto}.cavity-image{position:relative;width:360px;max-width:100%;margin:auto}.cavity-image img{display:block;width:100%;height:auto}.pin{position:absolute;transform:translate(-50%,-50%);border:2px solid white;box-shadow:0 1px 3px #0005;background:#122035;color:white;width:25px;height:25px;border-radius:50%;display:grid;place-items:center;font-size:14px;font-weight:700}.lab-map{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(120px,1fr))}.lab-map.three{grid-template-columns:repeat(3,minmax(0,1fr))}.lab-map.two{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-map>div{background:#e2f2ed;border:1px solid #a9cec2;border-radius:8px;padding:20px 12px;min-height:75px;display:grid;align-content:center;text-align:center;font-weight:650}.lab-map.three>div,.lab-map.two>div{font-size:21px}.lab-map .nest{font-size:14px;font-weight:400}.map-note{border-left:4px solid var(--teal);background:#edf5f9;padding:20px;font-weight:650}.correct-text{color:#087047;font-size:14px}.wrong-text{color:#a1352c;font-size:14px}.save-error{color:#a1352c!important}.test-overview{display:flex;gap:12px;flex-wrap:wrap;padding:15px;background:#e8f3ef;border-radius:8px}select:disabled{color:var(--ink);opacity:1}#save-status{display:block!important}@media(max-width:700px){nav button{padding:9px 8px;font-size:14px}.lab-map.two>div{font-size:16px}}