:root{color-scheme:light;--paper:#f4f2e9;--ink:#203c32;--muted:#59665c;--line:#cbd0c1;--green:#326e55;--rust:#b44830;--ochre:#a5812f;--panel:#eaece1;--font:Arial,Helvetica,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.55 var(--font);-webkit-font-smoothing:antialiased}::selection{background:#d7df83;color:var(--ink)}a{color:inherit;text-underline-offset:4px}button,input,select{font:inherit}button,select{cursor:pointer}button{border:1px solid var(--ink);border-radius:5px;background:transparent;color:var(--ink);padding:11px 15px;font-weight:600;transition:background .15s,color .15s}button:hover{background:#dde2ce}button:disabled{opacity:.6;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--rust);outline-offset:4px}.masthead,main,footer{max-width:1280px;margin:auto;padding-inline:48px}.masthead{display:flex;align-items:center;justify-content:space-between;padding-block:27px;border-bottom:1px solid var(--line)}.masthead>a:last-child{font-size:13px;text-decoration:none}.wordmark{display:flex;gap:11px;align-items:center;text-decoration:none;font-weight:700;font-size:19px;letter-spacing:-.5px}.wordmark svg{width:31px;height:31px;fill:none;stroke:currentColor;stroke-width:1.8}.intro{display:flex;justify-content:space-between;align-items:end;padding:52px 0 42px;gap:40px}h1{font:normal clamp(54px,6.7vw,86px)/.99 Georgia,'Times New Roman',serif;letter-spacing:-.035em;margin:0}h1 em{font-weight:normal;color:var(--green)}.intro-copy{padding-bottom:5px;max-width:410px;font-size:17px}.intro-copy p{margin:0 0 22px}.text-link{font-size:14px;font-weight:600;text-decoration:none;border-bottom:1px solid;padding-bottom:5px}.text-link span{margin-left:20px}.lab{display:grid;grid-template-columns:1.5fr 1fr;border-block:1px solid var(--line)}.road-panel{min-width:0;background:var(--panel);padding:23px 24px 20px}.panel-top,.road-footer{display:flex;align-items:center;justify-content:space-between;gap:12px}.live-label{font-size:12px;display:flex;align-items:center;gap:8px}.live-label i{height:6px;width:6px;border-radius:50%;background:var(--green)}.measurement{font:11px/1.5 'Courier New',monospace;font-variant-numeric:tabular-nums}.road-wrap{position:relative;height:430px}.road-wrap canvas{width:100%;height:100%;display:block}.road-center{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);text-align:center;pointer-events:none;width:240px}.road-center>span{display:block;font-size:11px}.road-center>span:first-child{font-weight:600;margin-bottom:10px}.road-center strong{font:normal 64px/1 Georgia,serif;font-variant-numeric:tabular-nums}.road-center p{font-size:12px;color:var(--muted);margin:19px 0 0}.legend{display:flex;gap:13px;font-size:10px}.legend span{display:flex;align-items:center;gap:5px}.legend i{width:7px;height:7px;border-radius:2px;display:inline-block}.slow-color{background:var(--rust)}.mid-color{background:var(--ochre)}.fast-color{background:var(--green)}.direction{font-size:10px;display:flex;align-items:center;gap:5px}.direction svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.5}.controls{padding:27px 0 25px 32px}h2{font:normal 28px/1.2 Georgia,serif;letter-spacing:-.025em;margin:0 0 10px}p{margin:0 0 15px}.control-intro{color:var(--muted);font-size:13px;max-width:350px}.presets{display:flex;gap:6px;margin:21px 0 28px}.presets button{font-size:11px;padding:8px 10px;border-color:var(--line);border-radius:4px}.presets button.selected{background:var(--ink);border-color:var(--ink);color:var(--paper)}.slider-group{margin-bottom:22px}.slider-group label{display:flex;align-items:center;justify-content:space-between;font-size:13px;font-weight:600;gap:10px}.slider-group output{font-family:'Courier New',monospace;font-size:13px;font-weight:normal}.slider-group input{width:100%;height:22px;margin:11px 0 2px;accent-color:var(--ink);cursor:pointer}.range-ends{display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.slider-group p{font-size:11px;color:var(--muted);margin:7px 0 0}.check-label{display:flex;align-items:center;gap:7px;font-size:12px}.check-label input{accent-color:var(--ink);width:15px;height:15px;margin:0}.check-label span{margin-left:auto;color:var(--muted);font:11px 'Courier New',monospace}.reset-note{color:var(--muted);font-size:10px;margin:6px 0 19px}.playback{display:flex;gap:7px}.primary{background:var(--ink);color:var(--paper)}.primary:hover{background:#385747}.playback button,.playback select{font-size:12px}.playback .primary{min-width:80px}.playback select{margin-left:auto;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink);max-width:105px}.experiment-note{font-size:11px;color:var(--muted);margin:15px 0 0;max-width:360px}.history-section{padding:32px 0 35px;border-bottom:1px solid var(--line)}.history-heading{display:flex;justify-content:space-between;gap:20px;align-items:start}.history-heading h2{font-size:24px}.history-heading p{font-size:12px;color:var(--muted);margin-bottom:18px}.history-heading>.measurement{white-space:nowrap;margin-top:7px}.history-grid{display:grid;grid-template-columns:40px minmax(0,1fr);gap:8px}.time-labels{font-size:10px;color:var(--muted);display:flex;flex-direction:column;justify-content:space-between;padding-bottom:25px}#history{display:block;width:100%;height:160px;background:var(--panel);border:1px solid var(--line)}.axis-labels{display:flex;justify-content:space-between;font:10px 'Courier New',monospace;margin-top:8px;color:var(--muted)}.measurements{display:flex;justify-content:space-between;gap:16px;padding-left:48px;margin-top:22px;font-size:12px}.measurements strong{font-family:'Courier New',monospace;font-weight:normal;margin-left:12px}.guard-note{margin:15px 0 0 48px;font-size:12px;color:#963b29}.explanation{display:grid;grid-template-columns:1fr 1.4fr;gap:100px;padding:65px 0;border-bottom:1px solid var(--line)}.explanation-title h2{font-size:46px;line-height:1.05}.explanation-title p{max-width:280px;color:var(--muted);margin-top:20px}.explanation-body{min-width:0}.explanation-body h3{font-size:15px;margin:0 0 10px}.explanation-body>p{font-size:14px;color:var(--muted);margin-bottom:27px;max-width:70ch}details{border-block:1px solid var(--line);padding:15px 0}summary{cursor:pointer;font-size:13px;font-weight:600}.rules{padding-top:20px;font-size:13px;color:var(--muted)}pre{overflow-x:auto;background:var(--panel);padding:17px;font:11px/1.6 'Courier New',monospace;color:var(--ink);max-width:100%}.verification{display:grid;grid-template-columns:1fr 1.4fr;gap:100px;padding:55px 0 65px}.verification h2{font-size:31px;max-width:340px}.verification>div>p{font-size:13px;color:var(--muted);margin:15px 0 22px}#verify{font-size:12px}#verify span{margin-left:20px}#verification-status{font-size:11px}.verification-results{border-top:1px solid var(--line);min-width:0}.verification-row{padding:13px 0;border-bottom:1px solid var(--line)}.verification-row h3{font-size:12px;margin:0 0 5px;display:flex;gap:10px}.verification-row h3 span{font:10px 'Courier New',monospace;color:var(--green);padding-top:2px}.verification-row.fail h3 span{color:var(--rust)}.verification-row p{font-size:11px;color:var(--muted);margin:0 0 0 34px}footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;padding-block:23px;font-size:11px;color:var(--muted)}footer a{text-decoration:none}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(min-width:1100px){.road-wrap{height:455px}}
@media(max-width:900px){.masthead,main,footer{padding-inline:25px}.lab{grid-template-columns:1.2fr 1fr}.road-panel{padding-inline:15px}.road-wrap{height:400px}.road-center{width:200px}.road-center strong{font-size:52px}.road-footer{flex-wrap:wrap;justify-content:center}.controls{padding-left:22px}.explanation,.verification{gap:45px}.presets{flex-wrap:wrap}.intro-copy{font-size:15px}.intro{gap:24px}}
@media(max-width:650px){.masthead,main,footer{padding-inline:20px}.masthead{padding-block:20px}.wordmark{font-size:17px}.masthead>a:last-child{font-size:11px}.intro{display:block;padding:34px 0 28px}h1{font-size:65px}.intro-copy{margin-top:23px;max-width:340px}.intro-copy p{margin-bottom:15px}.desktop-break{display:none}.lab{grid-template-columns:1fr}.road-panel{padding:18px 15px}.road-wrap{height:340px}.road-center strong{font-size:53px}.road-center>span:first-child{margin-bottom:6px}.road-center p{margin-top:12px}.road-footer{gap:10px}.controls{padding:26px 0 28px}.presets{margin:18px 0 25px}.presets button{font-size:12px;flex:1}.slider-group{margin-bottom:25px}.slider-group label{font-size:14px}.slider-group input{height:30px}.playback button{padding:12px 20px}.control-intro,.experiment-note{max-width:none}.history-heading{display:block}.history-heading>.measurement{display:block;margin:0 0 15px}.measurements{padding-left:0;gap:8px;flex-wrap:wrap;font-size:11px}.measurements strong{margin-left:4px}.history-grid{grid-template-columns:32px minmax(0,1fr);gap:4px}.axis-labels{font-size:9px}.guard-note{margin-left:0}.explanation,.verification{grid-template-columns:1fr;gap:23px;padding:36px 0}.explanation-title h2{font-size:38px}.explanation-title p{max-width:none;font-size:14px}.verification h2{max-width:none}footer{gap:20px;font-size:10px}.road-center{width:180px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}button{transition:none}}