@charset "UTF-8";
:root{color-scheme:light;--paper:#f4f5ef;--ink:#142e32;--muted:#566b6d;--line:#d8dfd5;--accent:#16705d;--yellow:#e6f294;--white:#fff;--radius:18px;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-size:15px;line-height:1.55}button,input,select{font:inherit}button,a,input,select,summary,canvas{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,canvas:focus-visible{outline:3px solid #d07c22;outline-offset:4px}a{color:var(--accent);text-underline-offset:3px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.12;letter-spacing:-.035em}h1{font-size:clamp(34px,4.8vw,60px);font-weight:650;margin-bottom:18px;max-width:900px}h1 em{font-style:normal;color:var(--accent)}h2{font-size:clamp(25px,3vw,36px);font-weight:620}h3{font-size:19px;letter-spacing:-.02em}small{font-size:12px}.shell{width:min(1440px,calc(100% - 64px));margin-inline:auto}.site-header{border-bottom:1px solid var(--line);background:#f4f5eff5}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:80px;gap:24px}.brand{display:flex;align-items:center;gap:10px;font-size:23px;font-weight:750;text-decoration:none;color:var(--ink);letter-spacing:-1px}.brand>span{background:var(--ink);color:var(--yellow);border-radius:9px;width:34px;height:34px;display:grid;place-items:center;font-size:22px}.site-header nav{display:flex;gap:24px;font-size:14px}.site-header nav a{text-decoration:none;color:var(--ink)}.hero{padding-top:44px;padding-bottom:28px;position:relative}.eyebrow{font-size:11px;letter-spacing:.13em;font-weight:750;color:var(--accent);text-transform:uppercase;margin-bottom:14px}.lede{max-width:790px;font-size:17px;color:var(--muted);line-height:1.65;margin-bottom:16px}.feature-list{display:flex;gap:8px 18px;flex-wrap:wrap;list-style:none;padding:0;margin:12px 0;font-size:12px;color:var(--muted)}.feature-list li::before{content:'↗';color:var(--accent);margin-right:7px}.lab-workbench{display:grid;grid-template-columns:310px minmax(0,1fr);gap:0;background:var(--white);border:1px solid var(--line);border-radius:22px;overflow:hidden;margin-bottom:42px;box-shadow:0 16px 50px #16352b06}.controls{padding:25px;border-right:1px solid var(--line);min-width:0}.controls h2{font-size:21px;margin-bottom:18px}.controls h3{font-size:16px;margin-top:20px}.field{display:flex;flex-direction:column;gap:7px;margin-bottom:16px;font-size:13px;font-weight:620}.field label{font-size:13px}.field>span,.field>label{display:block}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.field-row>*{min-width:0}.field input:not([type=checkbox]):not([type=range]),.field select,.controls input[type=number],.controls select{width:100%;min-width:0;border:1px solid #bbc8bd;border-radius:9px;background:#fafbf7;color:var(--ink);min-height:43px;padding:9px 11px;font-size:15px}.field-help,.hint,.help{font-size:12px;color:var(--muted);line-height:1.55}.controls label:has(input[type=checkbox]){display:flex;align-items:center;gap:8px;font-size:13px;margin:12px 0}.controls input[type=checkbox]{accent-color:var(--accent);width:17px;height:17px}.controls input[type=range],.stage-toolbar input[type=range]{accent-color:var(--accent);width:100%;min-width:80px}.button,button:not([class]){display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:10px 16px;border:1px solid #c5d0c5;border-radius:9px;font-size:13px;font-weight:650;background:#fff;color:var(--ink);text-decoration:none;transition:background .15s}.button:hover,button:not([class]):hover{background:#eaf0e4}.button-primary{background:var(--ink);color:var(--yellow);border-color:var(--ink)}.button-primary:hover{background:#245048}.controls>.button{width:100%;margin-bottom:10px}.example-strip{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:12px 0 22px}.example-strip>span{font-size:12px;color:var(--muted);margin-right:8px}.example-strip button{font-size:12px;border:1px solid #c9d4c9;border-radius:30px;padding:8px 13px;background:#fff;min-height:36px;color:var(--ink)}.example-strip button:hover,.example-strip button[aria-pressed=true]{border-color:var(--accent);background:#e9efdf}.stage-panel{min-width:0;display:flex;flex-direction:column}.stage{height:480px;position:relative;overflow:hidden;isolation:isolate;background:radial-gradient(ellipse at 45% 25%,#25454a 0%,#112c34 45%,#091d27 100%)}.stage canvas{width:100%;height:100%;display:block;touch-action:none;cursor:grab}.stage canvas:active{cursor:grabbing}.stage-fallback{padding:40px;color:#e2f0df;text-align:center;position:absolute;inset:0;display:grid;place-content:center;background:#112c34;z-index:3}.stage-help{background:#102731;color:#b9cdcb;font-size:11px;letter-spacing:.01em;margin:0;padding:11px 20px;border-top:1px solid #ffffff12}.stage-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:9px;padding:16px 21px;border-bottom:1px solid var(--line);background:#f9fbf6}.stage-toolbar label{font-size:12px;display:flex;align-items:center;gap:10px}.stage-toolbar button{font-size:12px;min-height:36px;padding:7px 12px}.metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;padding:22px 12px;background:#fff}.metric{padding:0 18px;min-width:0;border-right:1px solid var(--line)}.metric:last-child{border:0}.metric>span,.metric>dt{font-size:11px;color:var(--muted);display:block;margin-bottom:5px}.metric strong,.metric>dd{display:block;font-size:clamp(20px,2.2vw,30px);letter-spacing:-.04em;font-weight:600;font-variant-numeric:tabular-nums;margin:0}.metric small{font-size:11px;color:var(--muted);display:block}.status{font-size:12px;color:var(--muted);min-height:20px;line-height:1.6;overflow-wrap:anywhere}.error,[role=alert]:not(:empty){background:#fff0e9;color:#9b381c;padding:10px 12px;border-radius:8px;font-size:12px}.error[hidden],[hidden]{display:none!important}.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:26px;margin-bottom:40px}.note-card{background:#fff;border:1px solid var(--line);padding:26px;border-radius:var(--radius);min-width:0;font-size:14px;color:var(--muted)}.note-card h3{color:var(--ink)}.note-card p:last-child{margin:0}.note-card ul{padding-left:19px}.note-card li{margin-bottom:8px}.formula{background:#f0f3e9;padding:12px;border-radius:7px;color:var(--ink);font-family:ui-monospace,monospace;font-size:12px;overflow-wrap:anywhere}.site-footer{border-top:1px solid var(--line);padding-block:26px 35px;font-size:12px;color:var(--muted);display:flex;flex-wrap:wrap;gap:14px 28px;align-items:center}.site-footer p{margin:0}.site-footer nav{display:flex;flex-wrap:wrap;gap:18px;margin-left:auto}.site-footer a{color:var(--muted)}.skip-link{position:absolute;top:-100px;left:20px;z-index:10;padding:12px;background:white}.skip-link:focus{top:12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}details{border-top:1px solid var(--line);padding-block:15px}summary{cursor:pointer;font-weight:650;font-size:14px}details p{margin-top:14px}.result-note{padding:0 22px 20px;font-size:12px;color:var(--muted)}.lab-links{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 40px}.lab-links a{font-size:13px;text-decoration:none;border:1px solid var(--line);border-radius:10px;padding:12px 16px;background:#fff}table{border-collapse:collapse;width:100%;font-size:13px}th,td{text-align:left;padding:8px;border-bottom:1px solid var(--line)}.table-wrap{overflow:auto}
.hero{padding-top:30px;padding-bottom:14px}.hero h1{font-size:clamp(34px,3.8vw,49px);margin-bottom:14px}.hero .lede{max-width:1040px;font-size:16px}.hero h1 br{display:none}.hero h1 em{margin-left:.15em}.shell.example-strip{margin-inline:auto}
@media(min-width:1600px){.stage{height:560px}.lab-workbench{grid-template-columns:340px minmax(0,1fr)}}
@media(max-width:1000px){.shell{width:calc(100% - 40px)}.lab-workbench{grid-template-columns:280px minmax(0,1fr)}.controls{padding:20px}.stage{height:440px}.metric{padding:0 10px}.lesson-grid{grid-template-columns:1fr 1fr}.lesson-grid>article:last-child{grid-column:1/-1}.site-header nav{gap:16px}}
@media(max-width:700px){.shell{width:calc(100% - 28px)}.header-inner{min-height:66px;gap:10px}.brand{font-size:20px}.site-header nav{gap:12px;font-size:12px}.site-header nav a[href='#how-it-works']{display:none}.hero{padding-top:28px;padding-bottom:18px}h1{font-size:37px;letter-spacing:-.045em}.lede{font-size:15px}.lab-workbench{grid-template-columns:minmax(0,1fr)}.controls{border-right:0;border-bottom:1px solid var(--line);padding:20px}.stage{height:360px}.stage-toolbar{padding:14px;gap:8px}.metrics{padding:18px 6px}.metric{padding:0 10px}.metric strong,.metric>dd{font-size:22px}.lesson-grid{grid-template-columns:1fr;gap:13px}.lesson-grid>article:last-child{grid-column:auto}.note-card{padding:22px}.site-footer{display:block}.site-footer nav{margin:18px 0}.field-row{gap:12px}.example-strip{gap:7px}.stage-help{font-size:10px;padding:10px 14px}.lab-links{margin-bottom:28px}.lab-workbench{border-radius:16px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
/* Keep the live result beside long desktop controls; retain document order on phones. */
@media(min-width:1001px){.lab-workbench{overflow:clip;align-items:start}.stage-panel{position:sticky;top:12px}}
.scene-navigation{display:flex;align-items:center;gap:5px;flex-wrap:wrap;padding:10px 17px;background:#102b34;border-top:1px solid #ffffff16;color:#d8e8e5;min-width:0}.scene-navigation-label{font-size:9px;letter-spacing:.16em;font-weight:700;margin-right:7px;color:#96b4b7}.scene-navigation button{appearance:none;border:1px solid #6b929850;border-radius:7px;min-height:32px;padding:6px 10px;font-family:inherit;font-size:11px;font-weight:600;line-height:1.2;background:#173640;color:#d8e8e5}.scene-navigation button:hover{background:#28505a}.scene-navigation button[aria-pressed=true]{color:#142e32;background:#d6e9b7;border-color:#d6e9b7}.scene-navigation .scene-image-button{margin-left:auto;color:#def0bc}.scene-image-status{flex-basis:100%;font-size:10px;color:#b1cdce}.scene-image-status:empty{display:none}@media(max-width:700px){.scene-navigation{padding:9px 10px;gap:4px}.scene-navigation-label{display:none}.scene-navigation button{padding:7px;font-size:10px}.scene-navigation .scene-image-button{margin-left:auto}}