:root{color-scheme:light;--ground:#edf0f3;--paper:#fff;--ink:#142531;--muted:#4c6170;--line:#cbd6de;--accent:#b43b18;--teal:#086b74;--soft:#e9f4f4;font-family:'Segoe UI',Arial,system-ui,sans-serif;font-size:16px;line-height:1.55}
*{box-sizing:border-box}body{margin:0;background:var(--ground);color:var(--ink)}[hidden]{display:none!important}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}a{color:var(--teal);text-underline-offset:3px}button{cursor:pointer;border:1px solid var(--line);border-radius:7px;padding:9px 14px;background:var(--paper);color:var(--ink);line-height:1.3}button:hover{border-color:var(--teal);background:#f0f8f8}button:disabled{cursor:default;opacity:.45}:focus-visible{outline:3px solid var(--teal);outline-offset:4px}textarea,select{width:100%;padding:11px;border:1px solid #90a4b1;border-radius:6px;color:var(--ink);background:var(--paper)}textarea{resize:vertical;min-height:100px}label{display:block;font-weight:600;margin:12px 0 6px}select{min-height:46px}p{margin:0 0 14px}h1,h2,h3{line-height:1.18;letter-spacing:-.025em}h1{font-size:clamp(30px,4vw,46px);margin:0 0 12px}h2{font-size:25px;margin:0 0 9px}h3{font-size:19px;margin:22px 0 12px}img{max-width:100%;height:auto;display:block}figure{margin:0;min-width:0}figcaption{color:var(--muted);font-size:14px;margin:9px 0}.skip{position:absolute;top:-100px;padding:12px;background:white;z-index:10}.skip:focus{top:0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px max(20px,calc((100% - 1200px)/2));background:var(--paper);border-bottom:1px solid var(--line);font-size:14px}.brand{color:var(--ink);font-size:19px;font-weight:700;text-decoration:none}.brand b{color:var(--accent)}.wrap{max-width:1240px;padding:30px 20px 45px;margin:auto}.intro{display:flex;justify-content:space-between;gap:30px;align-items:center;margin-bottom:26px}.intro p:last-child{margin:0;max-width:70ch}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--teal);margin-bottom:12px}.duration{min-width:100px;border-left:2px solid var(--line);padding-left:24px;color:var(--muted);font-size:14px}.duration span{display:block;font-size:46px;color:var(--ink);line-height:1.2;font-weight:700}.steps{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--paper)}.steps button{border:0;border-right:1px solid var(--line);border-radius:0;display:flex;gap:12px;align-items:center;text-align:left;padding:15px}.steps button:last-child{border-right:0}.steps button b{font-size:22px;color:#7c8c96}.steps button small{display:block;color:var(--muted);margin-top:3px;font-size:13px}.steps button[aria-current]{background:var(--teal);color:white}.steps button[aria-current] b,.steps button[aria-current] small{color:#e5f9f8}.utility{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:16px 0}.utility p{font-size:13px;color:var(--muted);margin:0}.timer{display:flex;align-items:center;gap:8px;white-space:nowrap}.timer span{font-family:ui-monospace,monospace;font-weight:700;font-size:20px;min-width:55px}.timer button{font-size:14px;padding:7px 10px}.image-choice{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:19px 21px;background:var(--paper);border:1px solid var(--line);border-radius:9px}.image-choice h2{font-size:18px;letter-spacing:-.01em;margin:0 0 5px}.image-choice p{font-size:14px;color:var(--muted);margin:0}.image-buttons{display:flex;gap:8px}.image-buttons button{display:flex;align-items:center;gap:10px;padding:6px 10px;font-size:14px;text-align:left;min-height:52px}.image-buttons img{width:48px;height:34px;object-fit:cover;border-radius:3px}.image-buttons [aria-pressed=true]{border:2px solid var(--teal);background:var(--soft);padding:5px 9px}.brief{background:#dcebef;border-left:4px solid var(--teal);margin:12px 0 20px;padding:13px 17px;font-size:15px}.brief p{margin:0}.panel{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:26px}.section-head{display:flex;gap:15px;align-items:flex-start;margin-bottom:22px}.section-head p{margin:0;color:var(--muted)}.step-number{color:var(--accent);font-family:ui-monospace,monospace;font-size:27px;font-weight:700;line-height:1.2}.predict-layout{display:grid;grid-template-columns:1.15fr 1fr;gap:30px}.predict-layout figure img{border:1px solid var(--line);border-radius:6px}.answer-stack label:first-child{margin-top:0}details{margin-top:18px;font-size:14px;color:var(--muted);border-top:1px solid var(--line);padding-top:14px}summary{cursor:pointer;color:var(--teal);font-weight:600;margin-bottom:10px}details p:last-child{margin-bottom:0}.variant-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:23px}.variant-buttons button{text-align:left;padding:12px 14px}.variant-buttons span{display:block;font-size:13px;color:var(--muted);margin-top:4px}.variant-buttons button[aria-pressed=true]{border:2px solid var(--accent);padding:11px 13px;background:#fff5f0}.compare-images{display:grid;grid-template-columns:1fr 1fr;gap:20px}.caption{display:flex;justify-content:space-between;gap:12px;margin-bottom:10px;font-size:15px;flex-wrap:wrap}.caption span{font-family:ui-monospace,monospace;color:var(--muted)}.image-frame{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:6px;background:#edf0f3}.image-frame img{width:100%;touch-action:pan-y}.image-frame.inspect img{cursor:crosshair}.pick{position:absolute;width:20%;height:14.2857%;border:2px solid #fff;box-shadow:0 0 0 1px #102633;pointer-events:none}.comparison-stats{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px}.comparison-stats strong{font-size:17px;color:var(--teal)}.zoom-panel{padding:15px;background:#edf3f5;border:1px solid var(--line);border-radius:6px;margin-top:15px}.zoom-panel p{font-size:14px}.zoom-panel canvas{width:100%;height:auto;background:white;image-rendering:pixelated;border:1px solid var(--line)}.zoom-controls{display:flex;gap:30px}.zoom-controls label{font-weight:400;display:flex;align-items:center;gap:9px;margin:0;flex:1}.zoom-controls input{width:100%;min-width:0;accent-color:var(--teal)}.observation,.two{display:grid;grid-template-columns:1.5fr 1fr;gap:24px}.observation{margin-top:12px}.hint{font-size:14px;color:var(--muted);margin-top:8px}.table-scroll{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}th{background:#edf3f5;font-weight:600}td,th{padding:12px;border-bottom:1px solid var(--line);vertical-align:top}td:first-child{white-space:nowrap}td:nth-child(2){white-space:nowrap;font-family:ui-monospace,monospace}#recordedCount{font-size:14px;letter-spacing:0;color:var(--muted);font-weight:400}.evidence-summary{background:#edf3f5;border-radius:6px;padding:16px 18px;margin-bottom:20px}.evidence-summary p{margin:4px 0}.discussion{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;border-bottom:1px solid var(--line);margin:25px 0}.discussion b{color:var(--teal)}.two{grid-template-columns:1fr 1fr}fieldset{border:1px solid var(--line);padding:18px;margin:25px 0;border-radius:6px}legend{font-weight:600;padding:0 7px}.radio{display:inline-flex;align-items:center;gap:8px;margin:0 20px 10px 0;font-weight:400}.radio input{width:18px;height:18px;accent-color:var(--teal)}#feedback{margin:14px 0 0;font-weight:600}.finish{background:var(--soft);padding:20px;border-radius:7px}.finish h3{margin-top:0}.finish button{margin:0 8px 8px 0}.primary{background:var(--teal);border-color:var(--teal);color:#fff;font-weight:600}.primary:hover{background:#07555c;color:white}.navigation{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:20px 0 30px}.navigation p{margin:0;font-size:14px;color:var(--muted)}footer{border-top:1px solid var(--line);padding-top:20px;font-size:13px;color:var(--muted)}footer button{font-size:13px;padding:7px 10px}footer details{max-width:85ch}.notice{padding:20px;background:#fff0e6}.print-sheet{display:none}
@media(max-width:900px){.image-choice{align-items:flex-start;flex-direction:column}.image-buttons{width:100%}.image-buttons button{flex:1}.steps button{padding:12px 8px;gap:7px;font-size:14px}.steps button b{font-size:18px}.predict-layout{gap:20px}.comparison-stats{flex-wrap:wrap}.panel{padding:21px}.variant-buttons button{padding:11px;font-size:14px}.variant-buttons button[aria-pressed=true]{padding:10px}}
@media(max-width:620px){.wrap{padding:24px 14px}.top{padding:15px;gap:12px}.top>a:last-child{font-size:12px}.duration{display:none}.intro{margin-bottom:20px}.steps{grid-template-columns:repeat(5,1fr)}.steps button{display:block;text-align:center;padding:10px 3px;font-size:12px}.steps button b{display:block;font-size:17px;margin-bottom:5px}.steps button small{font-size:11px}.utility{align-items:flex-start;gap:12px}.utility p{max-width:45%;font-size:12px}.timer button{font-size:12px;padding:7px}.timer span{font-size:18px;min-width:48px}.image-buttons button{display:block;text-align:center;font-size:12px;padding:8px 6px}.image-buttons [aria-pressed=true]{padding:7px 5px}.image-buttons img{margin:0 auto 6px;width:65px;height:45px}.image-choice{padding:15px;gap:15px}.brief{font-size:14px;padding:12px}.panel{padding:18px 14px}.section-head{gap:11px}.section-head h2{font-size:23px}.section-head p{font-size:14px}.step-number{font-size:23px}.predict-layout,.two,.observation{grid-template-columns:1fr;gap:16px}.variant-buttons{grid-template-columns:1fr 1fr}.compare-images{gap:10px}.caption{display:block;font-size:13px;min-height:50px}.caption span{display:block;font-size:12px;margin-top:5px}figcaption{font-size:12px}.comparison-stats{gap:10px}.comparison-stats strong{font-size:16px}.comparison-stats span{font-size:12px}.zoom-controls{gap:12px;flex-direction:column}.zoom-controls label{font-size:14px}.discussion{grid-template-columns:1fr;gap:0}.navigation{gap:8px}.navigation button{font-size:14px;padding:10px}.navigation p{font-size:12px}.finish{padding:16px}td,th{padding:9px}table{min-width:520px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
@media print{body{background:white;color:black}.top,.wrap,.skip,noscript{display:none!important}.print-sheet{display:block!important;font:11pt/1.45 Arial,sans-serif;white-space:pre-wrap;padding:15mm;overflow-wrap:anywhere}}
/* Interactive compression control */
.compression-control{background:#edf5f6;border:1px solid #b5d1d6;border-radius:9px;padding:18px 22px;margin-bottom:24px}
.mode-buttons{display:flex;gap:6px;max-width:420px;margin-bottom:17px}
.mode-buttons button{flex:1;font-weight:600}
.mode-buttons button[aria-pressed=true]{background:var(--teal);border-color:var(--teal);color:white}
.range-title{display:flex;align-items:center;justify-content:space-between;gap:15px}
.range-title label{margin:0;font-size:18px}
.range-title output{font-size:27px;line-height:1.2;font-family:ui-monospace,monospace;font-weight:700;color:var(--teal)}
#compressionSlider{display:block;width:100%;height:48px;margin:10px 0 8px;cursor:ew-resize;accent-color:var(--teal);appearance:none;-webkit-appearance:none;background:transparent;touch-action:pan-y}
#compressionSlider::-webkit-slider-runnable-track{height:12px;background:linear-gradient(to right,#d39974,#6da2ac);border-radius:8px;border:1px solid #95a9af}
#compressionSlider::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;height:34px;width:34px;border-radius:50%;background:var(--teal);border:4px solid white;box-shadow:0 1px 5px #173c4b55;margin-top:-12px}
#compressionSlider::-moz-range-track{height:12px;background:linear-gradient(to right,#d39974,#6da2ac);border-radius:8px;border:1px solid #95a9af}
#compressionSlider::-moz-range-thumb{height:26px;width:26px;border-radius:50%;background:var(--teal);border:4px solid white;box-shadow:0 1px 5px #173c4b55}
.range-ends{display:flex;justify-content:space-between;gap:20px;font-size:13px;color:var(--muted)}
.range-ends span:last-child{text-align:right}
#sliderHint{font-size:14px;color:var(--muted);margin:13px 0 0}
.quick-settings{padding-top:12px;margin-top:14px}
.quick-settings .variant-buttons{margin:0}
.setting-link{font-size:inherit;text-align:left;padding:0;border:0;border-radius:0;color:var(--teal);text-decoration:underline;text-underline-offset:3px;background:none;white-space:normal}
#recordHeading{margin-bottom:8px}
#imageLoadStatus{font-size:13px;color:var(--muted);margin:0;min-height:20px}
#downloadVersion[aria-disabled=true]{pointer-events:none;color:var(--muted)}
@media(max-width:620px){.compression-control{padding:15px}.range-title label{font-size:16px}.range-title output{font-size:23px}.range-ends{font-size:12px}.mode-buttons button{font-size:14px}}