:root{--paper:#f4f5ef;--ink:#152d29;--green:#166447;--lime:#d8e9a2;--muted:#50635a;--line:#cbd4c9;--warn:#9a3c1d;--white:#fff;--radius:10px;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-size:16px;line-height:1.6;color-scheme:light}*{box-sizing:border-box}body{margin:0}a{color:var(--green);text-decoration-thickness:1px;text-underline-offset:4px}a:hover{text-decoration-thickness:2px}button,select,input{font:inherit}button,a,select{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button,select{min-height:44px}button:not(.button){border:1px solid var(--line);border-radius:5px;padding:8px 14px;background:transparent;color:var(--ink);font-size:.88rem;font-weight:600}button:hover:not(:disabled){filter:brightness(.94)}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #a84425;outline-offset:5px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2.5rem,6.2vw,5rem);line-height:1.04;letter-spacing:-.065em;font-weight:700;margin-bottom:24px}h2{font-size:clamp(1.55rem,3vw,2.4rem);line-height:1.15;letter-spacing:-.045em;margin-bottom:20px}h3{font-size:1.2rem;line-height:1.35;letter-spacing:-.015em}p{margin-bottom:20px}svg{flex-shrink:0}[hidden]{display:none!important}.wrap{max-width:1216px;margin:0 auto;padding:0 40px}.skip{position:fixed;z-index:100;top:-90px;left:16px;background:var(--white);padding:12px}.skip:focus{top:12px}.review-bar{background:var(--ink);color:#edf2df;text-align:center;font:11px/1.5 monospace;letter-spacing:.08em;padding:7px 12px}.site-header{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:103px;border-bottom:1px solid var(--line)}.brand{display:inline-flex;align-items:center;gap:6px;font-size:27px;font-weight:700;letter-spacing:-1.4px;text-decoration:none;color:var(--ink)}.brand 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15px}.reading>div{display:flex;align-items:baseline;gap:15px}.reading-value{font-size:clamp(4.5rem,9vw,7.2rem);line-height:1.2;font-weight:600;letter-spacing:-.075em;font-variant-numeric:tabular-nums}.reading-unit{font:20px monospace;color:var(--lime)}.reading p{font-size:12px;margin:9px 0 0}.reading .muted{color:#adc3b7}.graph-wrap{margin-top:auto}#frame-chart{display:block;width:100%;height:160px}.graph-caption{display:flex;justify-content:space-between;gap:15px;color:#b4c8b6;font:10px/1.5 monospace;padding-top:7px}.progress-row{display:flex;align-items:center;gap:16px;margin-top:24px}.progress-row span{font:11px monospace;white-space:nowrap;color:#d0ddc7}progress{appearance:none;height:3px;width:100%;border:0;background:#3c5649}progress::-webkit-progress-bar{background:#3c5649}progress::-webkit-progress-value{background:var(--lime)}progress::-moz-progress-bar{background:var(--lime)}#load-canvas{width:100%;height:80px;margin-top:12px;border:1px solid #3c5649}.test-controls{padding:30px 30px 20px;min-width:0}.step-marker{font:12px monospace;color:var(--green);display:block;margin-bottom:12px}.test-controls h2{font-size:1.65rem}.test-controls p{font-size:.87rem;line-height:1.6;color:var(--muted)}.test-controls label{font-size:12px;font-weight:bold;display:block;margin:14px 0 5px}select{width:100%;border:1px solid #b9c7bb;border-radius:5px;background:var(--white);padding:10px 34px 10px 10px;color:var(--ink);font-size:13px}.test-controls .small{font-size:11px;margin-top:10px}.button{display:inline-flex;align-items:center;justify-content:center;gap:20px;padding:12px 20px;min-height:48px;border-radius:5px;border:0;font-size:14px;font-weight:600;text-decoration:none}.primary{background:var(--green);color:var(--white)}.test-controls .button{width:100%;justify-content:space-between}.secondary-actions{display:flex;gap:10px;margin-top:10px}.secondary-actions button{flex:1}.test-controls .status{min-height:44px;font-size:12px;margin:14px 0 0}.test-footnote{grid-column:1/-1;padding:18px 28px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-top:1px solid var(--line);background:#f7f9f2}.test-footnote p{font-size:11px;line-height:1.7;max-width:640px;margin:0}.test-footnote button{flex-shrink:0;font-size:11px}.result{grid-column:1/-1;padding:32px;border-top:1px solid var(--line)}.result-heading{display:flex;justify-content:space-between;gap:24px;align-items:center}.result h2{font-size:1.7rem}.result .eyebrow{margin-bottom:8px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:20px 0 24px}.metrics div{padding:18px 0;border-top:1px solid var(--line)}.metrics dt{font-size:11px;color:var(--muted);min-height:36px}.metrics dd{font:600 24px monospace;letter-spacing:-1px;margin:0}.result-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;font-size:13px}.result .small{font-size:12px}.small{font-size:.85rem;color:var(--muted)}.content-section{padding:64px 0;border-bottom:1px solid var(--line)}.content-section>p{max-width:760px;color:var(--muted)}.content-section h2{max-width:650px}.cards,.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.cards>div,.cards>article,.guide-grid>div,.guide-grid>article{padding:22px 0;border-top:1px solid var(--line)}.cards p,.guide-grid p{font-size:.9rem;color:var(--muted)}.cards h3 a,.guide-grid h3 a{color:var(--ink)}.callout{border-left:3px solid var(--green);padding:20px 24px;background:#e8eee0;margin:28px 0}.callout p{margin:8px 0 0}.article{padding:60px 0 70px}.article-heading{max-width:900px}.article-heading h1{font-size:clamp(2.3rem,5vw,4.2rem);letter-spacing:-.055em}.article-body{max-width:810px;margin-top:40px}.article-body:has(.motion-tool){max-width:none}.article-body h2{font-size:1.9rem;margin-top:44px}.article-body h3{margin-top:28px}.article-body p,.article-body li{max-width:780px}.article-body ul,.article-body ol{padding-left:24px}.article-body 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8px}.motion-stage:fullscreen{display:flex;flex-direction:column;justify-content:center;padding:40px}.motion-lane{border-bottom:1px solid #435e52;padding:10px 0 14px}.motion-lane:last-child{border:0}.lane-label{font:12px monospace;color:#dae8bc}.motion-track{height:75px;position:relative;overflow:hidden;border-top:1px dashed #3b5349;border-bottom:1px dashed #3b5349;margin:10px 0}.runner{display:flex;gap:4px;align-items:center;justify-content:center;position:absolute;top:17px;left:0;width:40px;height:40px;background:var(--lime);border-radius:50%;will-change:transform}.runner i{display:block;width:3px;height:18px;background:var(--ink)}.motion-lane .small{font:10px monospace;color:#c2d2c0}.motion-actions{display:flex;flex-wrap:wrap;gap:12px;padding:20px 0 12px}.motion-tool #motion-status{font-size:13px;min-height:22px}.site-footer{padding-top:45px;padding-bottom:35px;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr auto;gap:24px}.site-footer 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button{margin-top:10px}.hero>p{display:none}}@media(max-width:640px){.wrap{padding-left:18px;padding-right:18px}.review-bar{font-size:9px}.brand{font-size:24px}.brand svg{width:28px}.languages{gap:8px;max-width:145px;font-size:10px}.site-header nav{justify-content:space-between;gap:12px}.site-header nav a{font-size:11px}.hero{padding:34px 0 28px}h1{letter-spacing:-.055em}.hero .eyebrow{font-size:10px}.test{display:flex;flex-direction:column}.instrument{min-height:345px;padding:22px}.reading{padding:18px 0 5px}.reading-value{font-size:5.5rem}#frame-chart{height:115px}.graph-caption{font-size:9px}.test-controls{padding:24px}.test-controls .controls-intro{display:none}.test-controls label:first-of-type{margin-top:0}.result{padding:24px}.result-heading{display:block}.result h2{font-size:1.6rem}.metrics{gap:12px}.metrics dd{font-size:22px}.test-footnote{padding:18px 24px}.content-section{padding:40px 0}.cards,.guide-grid{grid-template-columns:1fr;gap:0}.article{padding-top:34px}.article-body{margin-top:24px}.article-body table{font-size:12px}.article-body th,.article-body td{padding:8px}.motion-settings{grid-template-columns:repeat(2,1fr);padding:18px;gap:12px}.motion-stage{padding:15px}.motion-track{height:65px}.motion-actions button{flex:1 1 40%}.site-footer{grid-template-columns:1fr}.site-footer nav{flex-wrap:wrap}.callout{padding:16px}.result-actions{align-items:stretch}.result-actions button{width:100%}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}@media print{.review-bar,.site-header,.test-controls,.result-actions,.test-footnote,.site-footer,.motion-actions{display:none}.wrap{padding:0}.test{display:block}.result[hidden]{display:none}.instrument{print-color-adjust:exact}}
/* The primary action stays ahead of optional settings, including narrow screens. */
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.motion-tool:fullscreen{background:var(--paper);color:var(--ink);padding:24px 32px;overflow-y:auto;margin:0}.motion-tool:fullscreen .motion-stage{max-width:1200px;margin:auto}.motion-tool:fullscreen .motion-settings,.motion-tool:fullscreen .motion-actions,.motion-tool:fullscreen>p,.motion-tool:fullscreen .callout{max-width:1200px;margin-left:auto;margin-right:auto}@media(max-width:640px){.motion-tool:fullscreen{padding:16px}}

/* Preserve reflow when readers enlarge text, including long localized words. */
.wrap{overflow-wrap:anywhere}.secondary-actions button,.guide-grid>div,.cards>div{min-width:0}.secondary-actions button{overflow-wrap:anywhere}.reading-value{font-size:clamp(2rem,17vw,7.2rem)}.reading>div{flex-wrap:wrap}.metrics dd{overflow-wrap:anywhere}