:root{font-family:Arial,Helvetica,sans-serif;color:#17343d;background:#edf2f2;font-size:16px;--ink:#17343d;--teal:#086e70;--line:#dce5e5}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,select{cursor:pointer}button{background:#fff;border:1px solid var(--line);border-radius:7px;padding:9px 11px;color:var(--ink);font-size:.875rem;transition:background .16s}button:hover{background:#e7f2ef;border-color:#7bb8b1}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #d58d28;outline-offset:2px}button.active,.primary{background:#126c68;color:white;border-color:#126c68}header{height:80px;display:flex;align-items:center;gap:12px;padding:0 25px;background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;letter-spacing:2px;font-weight:700;font-size:19px}.brandmark{background:#153d47;color:white;border-radius:10px;display:grid;place-items:center;width:45px;height:45px;position:relative;font-family:Georgia;font-size:33px}.brandmark span{font-size:17px;position:absolute;right:3px;top:1px;color:#8dd0c5}.brand-sub{display:block;font-size:12px;letter-spacing:2.3px;font-weight:400;margin-top:5px}.header-note{flex:1;text-align:center;font-size:14px;color:#667b81}.notice{padding:10px 25px;background:#e7eee8;display:flex;align-items:center;gap:15px;font-size:12px;color:#466052}.notice b{font-size:12px}.notice button{margin-left:auto;background:transparent;border:0;padding:0;font-size:12px}main{display:grid;grid-template-columns:270px minmax(400px,1fr) 290px;min-height:calc(100vh - 122px)}aside{padding:22px 19px;background:#fff}.left{border-right:1px solid var(--line)}.right{border-left:1px solid var(--line)}.section-heading{display:flex;justify-content:space-between;align-items:center;font-size:12px;font-weight:700;letter-spacing:1.5px;margin-bottom:18px}.section-heading button{padding:0;border:0;font-size:12px;letter-spacing:0;font-weight:400;color:var(--teal)}label{font-size:14px;display:block;margin:12px 0 7px}input[type=search],select{width:100%;border:1px solid #d3dfdf;border-radius:6px;background:white;color:var(--ink);padding:10px 9px;font-size:14px;min-width:0}input[type=range]{width:100%;accent-color:#147d77;margin:1px 0 12px}input[type=checkbox]{accent-color:#12716c}.pair{display:flex;gap:7px;align-items:center}.pair>div,.pair>select{flex:1;min-width:0}.pair button{flex:1}.pair+.section-heading{margin-top:27px}.system{margin:0 0 11px}.system-row{display:flex;align-items:center;gap:8px}.system-row label{display:flex;align-items:center;gap:7px;margin:0;flex:1;font-size:14px}.system input[type=range]{margin:5px 0 0 25px;width:calc(100% - 27px);height:5px}.system .pct{font-size:12px;color:#6d8186}.swatch{width:8px;height:8px;border-radius:50%;display:inline-block}.muted{font-size:12px;color:#708185;line-height:1.6}.toggles{margin:17px 0}#explodeval{float:right;font-size:12px}.results{max-height:250px;overflow:auto;margin-top:4px;border:1px solid var(--line)}.results button{display:block;width:100%;text-align:left;border:0;border-radius:0;padding:10px}.results small{display:block;color:#698086;margin-top:3px}.workspace{min-width:0;display:flex;flex-direction:column}.modebar{display:flex;justify-content:center;gap:6px;background:#fff;padding:14px 8px;border-bottom:1px solid var(--line)}.modebar button{border:0;background:transparent;font-size:14px;padding:8px 13px}.modebar button.active{background:#e4efec;color:#096760;font-weight:600}.viewport{position:relative;height:calc(100vh - 247px);min-height:600px;overflow:hidden;background:radial-gradient(ellipse at 50% 40%,#fdfefd 0%,#edf2f1 65%,#e4eceb 100%);touch-action:none}#canvas,#labelLayer{position:absolute;inset:0}#canvas canvas{display:block;width:100%;height:100%}#labelLayer{pointer-events:none}.model-label{position:absolute;background:#fffffff0;border:1px solid #d1dfdc;padding:5px 9px;border-radius:5px;font-size:12px;white-space:nowrap;box-shadow:0 2px 8px #1639320c;pointer-events:auto;max-width:165px;overflow:hidden;text-overflow:ellipsis}.model-label.selected{background:#176e67;color:#fff}.viewtitle{position:absolute;top:24px;left:24px;pointer-events:none;max-width:85%}.eyebrow{font-size:12px;letter-spacing:2px;font-weight:700;color:#59847c}h1{font-size:29px;font-family:Georgia,serif;font-weight:400;margin:7px 0}h2{font-family:Georgia,serif;font-weight:400;font-size:27px;line-height:1.2;margin:12px 0 17px}p{line-height:1.6;font-size:14px}.viewtitle p{font-size:12px;color:#657c7e;margin:0}.orientation{position:absolute;bottom:88px;left:0;right:0;text-align:center;font-size:12px;letter-spacing:1px;color:#70867f;pointer-events:none}.viewtools{position:absolute;bottom:42px;left:50%;transform:translateX(-50%);display:flex;gap:3px;background:#ffffffd9;padding:5px;border-radius:9px;box-shadow:0 2px 15px #264b4310;white-space:nowrap}.viewtools button{border:0;background:transparent;padding:8px;font-size:12px}.zoomtools{position:absolute;right:17px;top:43%;display:grid;gap:5px}.zoomtools button{width:35px;height:35px;padding:0;font-size:22px}.canvas-hint{position:absolute;bottom:17px;left:0;right:0;text-align:center;font-size:12px;color:#788b89;pointer-events:none}.legend{position:absolute;left:17px;bottom:110px;display:grid;gap:6px;font-size:12px;color:#657b77}.legend i{width:6px;height:6px;display:inline-block;border-radius:50%;margin-right:5px}.bottomtools{display:grid;grid-template-columns:repeat(3,1fr);background:white;border-top:1px solid var(--line)}details{padding:16px 13px;border-right:1px solid var(--line)}summary{font-size:14px;cursor:pointer;color:#335d58}.toolcontent{padding-top:13px}.toolcontent p{font-size:12px}.intro-card{background:#edf5f2;border-radius:8px;padding:18px;margin:27px 0}.intro-card b{font-size:14px}.intro-card p{margin-bottom:0}.right hr{border:0;border-top:1px solid var(--line);margin:24px 0}.info-tag{display:inline-block;color:#56786d;background:#eaf1ed;font-size:12px;padding:5px 8px;border-radius:4px;margin:7px 0 18px}.infoactions{display:flex;flex-wrap:wrap;gap:5px}.infoactions button{font-size:12px;padding:7px}.field{padding:12px 0;border-bottom:1px solid #ecf0ef}.field h3{font-size:12px;text-transform:uppercase;letter-spacing:1px;margin:0 0 5px;color:#6b817b}.field p{margin:0;font-size:14px;line-height:1.55}.field a,a{color:#096e72}.memory{background:#fff5df;padding:13px;border-radius:7px;margin-top:20px;font-size:13px;line-height:1.6}#answers button{width:100%;text-align:left;margin:5px 0}#feedback.correct{background:#e4f2e9;color:#24613c;padding:12px}#feedback.wrong{background:#ffefe9;color:#8d4026;padding:12px}#question{font-size:22px}#review{margin-top:10px;width:100%}#missed{font-size:13px}dialog{max-width:790px;width:calc(100% - 35px);max-height:85vh;border:0;border-radius:14px;padding:25px;color:#193c42;box-shadow:0 24px 80px #001a2950}dialog::backdrop{background:#0b263c80}.dialoghead{display:flex;justify-content:space-between;align-items:center}.dialoghead h2{margin:0 0 15px}.dialoghead button{align-self:start}dialog p,dialog li{font-size:14px;line-height:1.7}dialog table{border-collapse:collapse;width:100%;font-size:13px}dialog td,dialog th{text-align:left;border-bottom:1px solid #dde6e2;padding:10px}dialog h3{font-size:16px;margin-top:24px}#error{position:absolute;inset:150px 30px auto;background:#fff5df;padding:20px;border:1px solid #d9ab59;border-radius:8px}body.cb .swatch{border:1px solid #253b4a}button:disabled{opacity:.6;cursor:default}@media(min-width:1500px){main{grid-template-columns:290px minmax(400px,1fr) 330px}aside{padding:26px}.viewport{min-height:700px}}@media(max-width:1100px){main{grid-template-columns:235px minmax(360px,1fr)}.right{grid-column:1/-1;border-top:1px solid var(--line)}.right #info{max-width:900px;margin:auto}.viewport{height:720px}.header-note{font-size:12px}.viewtools button{padding:7px 5px}}@media(max-width:650px){header{height:70px;padding:0 13px}.brand{font-size:15px}.brand-sub{font-size:8px}.header-note{display:none}header>button{margin-left:auto;padding:8px;font-size:12px}header>button:last-child{margin-left:0}.notice{padding:9px 12px;gap:7px;flex-wrap:wrap}.notice span{font-size:12px}.notice button{margin-left:0}main{display:flex;flex-direction:column}.workspace{order:0}.left{order:1}.right{order:2}.viewport{height:650px;min-height:550px}.viewtitle{left:17px;top:20px}.modebar{gap:0;padding:11px 2px}.modebar button{font-size:12px;padding:8px 10px}.bottomtools{grid-template-columns:1fr}.bottomtools details{border-bottom:1px solid var(--line)}.viewtools{gap:0}.viewtools button{font-size:12px;padding:7px}.legend{bottom:116px}.left #systems{display:grid;grid-template-columns:1fr 1fr;gap:10px 15px}.left,.right{padding:20px}.viewtitle h1{font-size:27px}.canvas-hint{font-size:12px}.pair select{font-size:13px}}
@media(min-width:1101px){aside{max-height:calc(100vh - 114px);overflow-y:auto;scrollbar-width:thin}.viewport{min-height:550px}.right{scrollbar-gutter:stable}}@media(max-width:650px){aside{max-height:none}}

/* Vibrant laboratory palette with crisp, readable controls. */
:root{--ink:#202b53;--teal:#6540d7;--line:#dce0f4;color:var(--ink);background:#eef0ff}
header{border-top:4px solid #8051ef;background:linear-gradient(110deg,#fff,#f5efff)}
.brandmark{background:linear-gradient(140deg,#7745df,#267eec)}.brandmark span{color:#72ffdf}
.notice{background:#e8f4ff;color:#314d73}
button.active,.primary{background:#6942cf;border-color:#6942cf;color:#fff}
button:hover{background:#f0eaff;border-color:#9a79ef}
.modebar button.active{background:#eee6ff;color:#6038c3}
input[type=range],input[type=checkbox]{accent-color:#7950dc}
.viewport{background:radial-gradient(ellipse at 50% 40%,#ffffff 15%,#eef4ff 62%,#e5dcfa 100%)}
.eyebrow{color:#7046c5}.intro-card{background:linear-gradient(135deg,#eee7ff,#e5f7ff)}
.info-tag{background:#eee7ff;color:#6041a7}.model-label.selected{background:#7042d0}
.swatch{width:11px;height:11px;box-shadow:0 0 0 2px #ffffff,0 0 0 3px #e1dcef}