@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&family=Manrope:wght@400;500;600;650;700;750;800&display=swap');
:root{--bg:#f6f7f4;--ink:#1c3029;--muted:#6b7872;--green:#176148;--dark:#133f32;--line:#e0e6df;--mint:#e9f1e9;--white:#fff;--gold:#c9df8d}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 'DM Sans',sans-serif}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #92b660;outline-offset:3px}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3,h4{font-family:Manrope,'DM Sans',sans-serif;line-height:1.25;letter-spacing:-.035em}h1{font-size:40px;font-weight:750}h2{font-size:26px;font-weight:750}h3{font-size:20px;font-weight:750}p{color:#54665d}.sidebar{width:258px;position:fixed;inset:0 auto 0 0;background:#fff;border-right:1px solid var(--line);padding:30px 22px;display:flex;flex-direction:column;z-index:5}.brand{font:750 34px/1 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solid var(--line);padding-top:20px;margin-top:25px;display:flex;justify-content:space-between;gap:12px}.roadmap{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:25px}.roadmap span{border:1px solid #dbe3d3;background:#fff;border-radius:4px;padding:5px 8px;font-size:13px;color:#7a8b6b}footer{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding:20px 40px;color:#9aa594;font-size:12px}footer i{margin:0 6px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:#153f30;color:white;padding:10px 20px;border-radius:7px;font-size:16px;z-index:20;display:none}details{margin:15px 0;font-size:16px;color:#6c825b}summary{cursor:pointer}details .formula{font-size:14px;margin-top:10px}.lesson-card.done{border-color:#99b482}.lesson-card.done .lesson-num{color:#386e37}.mobile-title{display:none}@media(min-width:1550px){main{padding-top:45px}.hero{min-height:310px}.hero-content{padding:40px}.hero h2{font-size:42px}}@media(max-width:1100px){.sidebar{width:222px;padding:25px 16px}.shell{margin-left:222px}main{padding:28px}.hero h2{font-size:32px}.learning-grid{grid-template-columns:1fr 1fr}.split{grid-template-columns:minmax(0,1fr) 245px}.lab-grid{grid-template-columns:1fr 1.3fr}.metric strong{font-size:22px}.head-right{display:none}.connection-layout{grid-template-columns:1fr}.graph{height:400px}.build-grid{grid-template-columns:1fr}}@media(max-width:780px){.sidebar{position:relative;width:100%;padding:18px 20px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:30px}.brandline,.workspace,.navlabel,.sidebar-bottom{display:none}nav{display:flex;overflow:auto;gap:3px;margin-top:17px}nav a{white-space:nowrap;font-size:14px;padding:8px}nav a>span{display:none}nav b{font-size:12px}.shell{margin-left:0}header{height:48px;padding:0 20px}main{padding:23px 20px}.hero{grid-template-columns:1fr}.hero-content{padding:25px}.hero h2{font-size:34px}.hero-art{display:none}.page-title{display:block}.page-title .badge{margin-top:13px}.overview{gap:7px}.stat-card{padding:12px 10px;gap:7px}.stat-icon{display:none}.stat-card strong{font-size:23px}.stat-card small{font-size:12px}.learning-grid{gap:10px}.lesson-card{padding:16px;min-height:220px}.lesson-top{margin-bottom:15px}.lesson-card h3{font-size:17px}.lesson-card p{font-size:14px}.split,.lab-grid,.term-grid{grid-template-columns:1fr}.toolbar{flex-direction:column}.toolbar select{max-width:none}.panel{padding:20px}.aside-panel{order:2}.page-title h1{font-size:30px}.metric strong{font-size:26px}.field-grid{gap:10px}.connection-layout{display:block}.graph-panel{padding:8px}.graph{min-height:290px;height:auto}footer{padding:20px;display:block}footer span{display:block;margin-bottom:6px}.completion{flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* Readable type and spacing across all learning surfaces. */
body{line-height:1.7}
.sidebar{width:288px;padding:28px 24px}.shell{margin-left:288px}
nav a{padding:13px 10px;line-height:1.5}nav b{font-size:12px}
.brandline{letter-spacing:1.1px}.workspace small{line-height:1.5}
.hero h2{max-width:530px}.hero p{max-width:470px}
.mini-table{max-width:380px;width:100%;padding:18px}.mini-row{grid-template-columns:1.3fr 1fr .8fr}
.lesson-card{min-height:245px}.lesson-card p{line-height:1.7}
.field label{line-height:1.55}.field input,.field select{padding:12px;min-height:48px}
.panel p,.panel li{line-height:1.85}.formula{line-height:1.85}
.graph text{font-size:14px}.graph{min-height:425px}
.term-card p{line-height:1.8}.calc-note{line-height:1.8}
.btn{min-height:44px}.question button{padding:12px 14px;line-height:1.6}
@media(max-width:1100px){.sidebar{width:260px;padding:25px 18px}.shell{margin-left:260px}.split{grid-template-columns:1fr}.hero{grid-template-columns:1.15fr 1fr}.hero-content{padding:28px}.hero h2{font-size:32px}.mini-table{padding:14px}.mini-row{font-size:12px}.hero-art{padding:14px}.lab-grid{grid-template-columns:minmax(260px,.9fr) minmax(0,1.2fr)}.metric-row{grid-template-columns:1fr}}
@media(max-width:780px){.sidebar{width:100%;padding:20px}.shell{margin-left:0}nav a{font-size:15px;padding:10px 12px}.hero{grid-template-columns:1fr}.hero h2{font-size:34px}.learning-grid{grid-template-columns:1fr 1fr}.lesson-card{min-height:250px}.lesson-card p{font-size:16px}.lab-grid{grid-template-columns:1fr}.metric-row{grid-template-columns:1fr 1fr}.graph{min-height:300px}.overview{grid-template-columns:1fr}.stat-card{padding:14px 18px}.stat-card strong{display:inline-block;margin-right:12px}.stat-card small{font-size:14px}.stat-icon{display:grid}.page-title h1{font-size:32px}.page-title p{font-size:17px}}
@media(max-width:480px){.learning-grid,.metric-row{grid-template-columns:1fr}.lesson-card{min-height:220px}.toolbar select{width:100%}.breadcrumb{font-size:13px}.hero-content{padding:24px}.hero h2{font-size:32px}main{padding:24px 18px}.graph text{font-size:15px}}

.journey-intro{border-bottom:1px solid var(--line);padding-bottom:25px;margin-bottom:30px}.journey-stages{list-style:none;counter-reset:journey;padding:0!important;display:grid;grid-template-columns:1fr 1fr;gap:12px}.journey-stages li{counter-increment:journey;position:relative;padding:16px 16px 16px 48px!important;margin:0;background:#f2f6ed;border:1px solid #dee8d6;border-radius:8px}.journey-stages li:before{content:counter(journey);position:absolute;left:15px;top:17px;font-size:14px;color:#57804b}.journey-stages strong{display:block;font-size:17px;color:#2b563b}.journey-stages span{display:block;font-size:15px;line-height:1.65;margin-top:5px}.journey-table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px}.journey-table{border-collapse:collapse;width:100%;min-width:500px;font-size:14px}.journey-table th,.journey-table td{text-align:left;padding:12px;border-bottom:1px solid var(--line);vertical-align:top}.journey-table th{background:#edf3e8;color:#466c3f;font-weight:600}.journey-table tr:last-child td{border:0;background:#f6f9f2}.panel .journey-caption{font-size:14px;color:#718168;margin-top:12px}.journey-intro~h3{scroll-margin-top:20px}@media(max-width:780px){.journey-stages{grid-template-columns:1fr}.journey-table{font-size:15px}}