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:root{font-family:Arial,sans-serif;color:#15353b;background:#f4f7f6;font-size:17px}*{box-sizing:border-box}body{margin:0}a{color:#087e80}header{display:flex;justify-content:space-between;gap:22px;padding:24px 5vw;border-bottom:1px solid #d5e4df;flex-wrap:wrap}.brand{font-weight:800;text-decoration:none;letter-spacing:.07em}header nav{display:flex;gap:16px 24px;flex-wrap:wrap}header nav a{text-decoration:none}header [aria-current]{border-bottom:3px solid #087e80}main{max-width:1200px;margin:auto;padding:36px 24px 70px}.eyebrow{font-size:12px;font-weight:800;letter-spacing:.14em;color:#087e80}h1{font-size:clamp(44px,7vw,76px);letter-spacing:-.05em;margin:12px 0}h2{font-size:clamp(28px,3.5vw,39px);line-height:1.15;margin:12px 0 20px}h3{font-size:21px;margin:12px 0 16px}p{line-height:1.65}.intro>p:not(.eyebrow){font-size:21px;max-width:930px}.exerciseNav{display:flex;flex-wrap:wrap;gap:12px 24px;margin:25px 0 35px}.exerciseNav 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#087e80;outline-offset:-3px}.responseGrid button.matched{box-shadow:inset 0 0 0 2px #da4e9f}.featureLayout .responseGrid button{font-size:13px}.result{padding:18px 22px;border-left:5px solid #087e80;border-radius:0 8px 8px 0;background:#e1f3ed;line-height:1.6;font-size:19px;min-height:70px}.result strong{font-variant-numeric:tabular-nums}.concept{padding:18px 20px;background:#f5f2fc;border-left:4px solid #7650af}.tableScroll{overflow:auto}table{width:100%;border-collapse:collapse;margin:20px 0;font-size:16px}th,td{text-align:left;padding:9px;border-bottom:1px solid #d5e4df}th{background:#f2f8f6}.pythonExample{margin-top:28px;border-top:1px solid #d5e4df;padding-top:20px}pre{background:#102d35;color:#e8f9f3;border-radius:10px;padding:22px;overflow:auto;font:15px/1.65 Consolas,monospace;tab-size:4;white-space:pre}.pythonExample pre{max-height:380px}pre code{background:none;padding:0}.next{background:#e1f3ed}.next p{max-width:900px}.next .button{font-size:20px;padding:15px 20px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #7650af;outline-offset:3px}@media(max-width:900px){.filterLayout{grid-template-columns:1fr 1fr}.filterLayout>div:last-child{grid-column:1/-1}.responseGrid{max-width:350px}.featureLayout .responseGrid button{font-size:16px}}@media(max-width:600px){main{padding:25px 14px}.exercise,.downloads,.next{padding:22px 18px}.diagonalLayout,.filterLayout{grid-template-columns:1fr}.filterLayout>div:last-child{grid-column:auto}.intro>p:not(.eyebrow){font-size:19px}.result{font-size:17px;padding:15px}.controls{align-items:start}.diagonalGrid button{height:90px}pre{font-size:13px;padding:16px}header{padding:20px}header nav{gap:12px 18px}}@media print{header,.controls,.exerciseNav,.pythonExample button{display:none}.exercise{break-before:page}.pythonExample pre{max-height:none;white-space:pre-wrap}.next{break-inside:avoid}body{background:white}}
#diagonal .pythonExample pre{max-height:none;white-space:pre-wrap}.codeGuide{line-height:1.8}.codeGuide li{margin:9px 0}.photoViews{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;margin:25px 0}.photoViews>div{min-width:0}.photoViews canvas{display:block;width:auto;max-width:100%;height:330px;image-rendering:pixelated;background:#edf2f0;border:1px solid #b7d9cf;cursor:crosshair}.photoViews h3{font-size:20px}.photoCalculation{display:grid;grid-template-columns:220px 1fr;gap:30px;margin-top:28px}.photoWeightGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}.photoWeightGrid span{padding:12px;text-align:center;border:1px solid #adc8c1;border-radius:5px;background:#e1f3ed}.photoViews canvas:focus-visible{outline:3px solid #7650af}#real-photo output{display:block}#real-photo input[type=file]{max-width:250px}@media(max-width:760px){.photoViews{grid-template-columns:1fr 1fr}.photoViews>div:last-child{grid-column:1/-1}}@media(max-width:600px){.photoViews,.photoCalculation{grid-template-columns:1fr}.photoViews>div:last-child{grid-column:auto}.photoViews canvas{height:300px}.photoWeightGrid{max-width:220px}}
.photoEditor{display:grid;grid-template-columns:280px minmax(0,1fr);gap:30px;padding:22px;border:1px solid #adc8c1;border-radius:12px;background:#f5faf8;margin:24px 0}.photoEditor p:first-child{margin-top:0}.photoWeightGrid input{width:100%;min-width:0;padding:14px 6px;text-align:center;font-size:23px;font-weight:700;border:2px solid #80aaa0;border-radius:7px;background:white;color:#15353b}.photoWeightGrid input:focus{outline:3px solid #a67cdd;outline-offset:2px}.photoWeightGrid input[aria-invalid=true]{border-color:#b32549}.photoCalculation{display:block}@media(max-width:760px){.photoEditor{grid-template-columns:1fr}.photoWeightGrid{max-width:280px}}
.photoViews canvas{image-rendering:auto}.photoFilterHelp{padding:0 6px}.photoWalk{padding:24px;background:#f4f0fa;border:1px solid #c9b8df;border-radius:14px;margin:30px 0}.photoWalkMatrices{display:grid;grid-template-columns:minmax(0,1fr) 25px minmax(0,1fr) 25px minmax(0,1fr);gap:14px;align-items:center}.photoWalkMatrices>div{min-width:0}.photoWalkMatrices h4{font-size:18px;margin:12px 0}.photoMatrix{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px}.photoMatrix span{display:grid;place-items:center;min-height:56px;padding:6px 2px;font-size:20px;font-weight:700;background:white;border:1px solid #b2a4c1;border-radius:5px;font-variant-numeric:tabular-nums}.photoMatrix span.active{outline:4px solid #b45ce7;outline-offset:-3px}.photoMatrix span.counted{background:#dfefe9}.photoMathOperator{text-align:center;font-size:28px}.photoWalkStage{min-height:3.3em;font-size:19px;font-weight:700}.photoWalkSum{font-size:19px;line-height:1.8;overflow-wrap:anywhere}.photoWalkOutput{padding:16px;background:#e2f2eb;font-size:20px;font-weight:bold;min-height:4.2em}.photoViews>div canvas{border:1px solid #abc1bc}@media(max-width:700px){.photoWalkMatrices{grid-template-columns:1fr}.photoMathOperator{display:none}.photoMatrix{max-width:300px}.photoWalk{padding:16px}}
.photoWalkContext{display:grid;grid-template-columns:130px 130px minmax(0,1fr);gap:20px;align-items:center}.photoWalkContext h4{margin:8px 0}.photoWalkContext canvas{display:block;width:120px;height:auto;max-width:100%;border:1px solid #b2a4c1}.photoWalkContext .photoWalkStage{min-height:0}@media(max-width:600px){.photoWalkContext{grid-template-columns:1fr 1fr}.photoWalkContext .photoWalkStage{grid-column:1/-1}}
.photoChoices{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin:24px 0}.photoChoice{padding:8px;text-align:left;display:flex;flex-direction:column;gap:8px}.photoChoice img{width:100%;height:110px;object-fit:cover;border-radius:5px}.photoChoice span{font-size:13px;line-height:1.4}.photoChoice[aria-pressed=true]{outline:3px solid #087e80;background:#e1f3ed}.eyeHunt{background:#eff8f4;border:1px solid #91bdb0;border-radius:14px;padding:24px;margin:30px 0;scroll-margin-top:20px}.eyeHunt ol{line-height:1.7}.eyeHuntLayout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:26px}.eyeHunt canvas{display:block;width:100%;height:auto;background:#dce6e2;cursor:crosshair;border:2px solid #87b3a6;border-radius:7px}.eyeHunt canvas:focus-visible{outline:4px solid #8953c4}.eyeHunt #eyeFeedback{white-space:pre-line;line-height:1.8;font-weight:700}.eyeHunt .concept{font-size:15px}.eyeHunt button[aria-pressed=true]{background:#d7bee9}@media(max-width:800px){.photoChoices{grid-template-columns:repeat(3,minmax(0,1fr))}.eyeHuntLayout{grid-template-columns:1fr}}@media(max-width:500px){.photoChoices{grid-template-columns:repeat(2,minmax(0,1fr))}.eyeHunt{padding:16px}}
.eyeAnswers{margin:28px 0;padding:20px;border:1px solid #91bdb0;border-radius:12px;background:#fff;scroll-margin-top:20px}.eyeAnswers summary{font-size:21px;font-weight:700;cursor:pointer;line-height:1.5}.eyeAnswers summary:focus-visible{outline:3px solid #7650af;outline-offset:4px}.eyeAnswerCards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin:22px 0}.eyeAnswerCard{min-width:0;padding:18px;background:#f4f8f6;border:1px solid #c0d5cd;border-radius:10px}.eyeAnswerCard h4{font-size:22px;margin:0 0 16px}.eyeAnswerCard canvas{cursor:default;border-color:#597e71}.eyeAnswerCard p{margin:14px 0 0}@media(max-width:700px){.eyeAnswerCards{grid-template-columns:1fr}.eyeAnswers{padding:16px}}
.eyeExampleSettings{border-top:1px solid #bdd2c9;margin-top:20px;padding-top:18px}.eyeExampleSettings h5{font-size:18px;line-height:1.5;margin:0 0 14px}.eyeExampleMatrix{width:210px;max-width:100%;table-layout:fixed;border-collapse:separate;border-spacing:4px;margin:12px 0}.eyeExampleMatrix caption{text-align:left;font-size:14px;color:#537077;padding-bottom:7px}.eyeExampleMatrix td{text-align:center;background:#e1f3ed;border:1px solid #91bdb0;border-radius:5px;padding:10px;font-size:23px;font-weight:700;font-variant-numeric:tabular-nums}.eyeExampleValues{font-weight:700;line-height:1.8}.eyeExampleSettings button{margin-top:16px}.eyeExampleSettings button:disabled{opacity:.6;cursor:wait}#eyeExampleStatus[hidden]{display:none}
/* Solvable, full-image template hunt. */
#eyeHuntTitle{font-size:clamp(25px,3vw,35px)}.huntScope{background:#fff;border-left:4px solid #087e80;padding:18px}.huntBanks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:24px 0}.huntBank{padding:16px;background:white}.huntBank>strong{display:block;font-size:22px;margin-bottom:16px}.huntBank[aria-pressed=true]{outline:4px solid #087e80;background:#e1f3ed}.huntPatches{display:flex;gap:12px;flex-wrap:wrap}.huntPatches figure{margin:0;flex:1;min-width:70px}.eyeHunt .huntPatches canvas{width:100%;height:auto;image-rendering:pixelated;border:1px solid #819d93;border-radius:3px;cursor:default}.huntPatches figcaption{font-size:13px;margin:8px 0;text-align:center}.huntViews{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:25px}.huntViews>div{min-width:0}.huntViews h4{font-size:20px;margin:12px 0}.eyeHunt .huntViews canvas{width:100%;height:auto;max-height:580px;object-fit:contain;border-color:#779b90;border-width:1px}.eyeHunt #huntHeatmap{cursor:default}#huntResult{font-size:21px;min-height:108px}#huntResult[data-state=passed]{background:#d4f4df;border-color:#138449}#huntResult[data-state=retry]{background:#fff0d9;border-color:#b37a1c}#huntControls{scroll-margin-top:20px}.huntWeights,.huntMath{padding:16px;border:1px solid #b7cfc4;border-radius:9px;background:#fff;margin:16px 0}.huntWeights summary,.huntMath summary{font-weight:700;cursor:pointer;line-height:1.5}.huntWeights p{font-size:14px}.huntTableScroll{overflow:auto;max-height:410px}.huntWeights table{font:12px/1.5 Consolas,monospace;width:max-content;margin:12px 0}.huntWeights td{padding:5px 7px;text-align:right;border:1px solid white;font-variant-numeric:tabular-nums}.huntWeights td.positive{background:#ffe1b7;color:#623609}.huntWeights td.negative{background:#d7e6fd;color:#1f4978}.huntTrace{background:#f5f2fc;border-left:4px solid #7650af;padding:20px;line-height:1.9}.huntMath math{font-size:23px;overflow:auto;padding:12px}.eyeAnswerCard .huntPatches{margin:18px 0}.eyeAnswerCard>button{margin:16px 0}.huntBank:focus-visible,.huntWeights summary:focus-visible,.huntMath summary:focus-visible{outline:3px solid #7650af;outline-offset:4px}@media(max-width:760px){.huntViews{grid-template-columns:1fr}.huntBanks{gap:8px}.huntBank{padding:10px}.huntBank>strong{font-size:17px}.huntPatches{gap:6px}.huntPatches figure{min-width:40px}#huntResult{font-size:18px}}@media(max-width:450px){.huntBanks{grid-template-columns:1fr}.huntBank .huntPatches{max-width:240px;margin:auto}}
#huntBanks .huntBank[aria-pressed=true]{background:#d5eee4}#huntBanks .huntBank:hover{background:#edf7f2}