:root{--paper:#f5f5ef;--white:#fff;--ink:#22372e;--muted:#66736a;--line:#dfe4da;--forest:#193b30;--lime:#dcf78b;--lilac:#e8e3fa;--peach:#f8e3d4;--radius:18px;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0;font-size:14px;line-height:1.65}a{color:inherit;text-underline-offset:4px}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #779d35;outline-offset:4px}input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid #779d35;outline-offset:2px}[hidden]{display:none!important}.skip{position:fixed;left:16px;top:-60px;z-index:100;background:var(--lime);padding:10px}.skip:focus{top:12px}.sidebar{width:250px;position:fixed;inset:0 auto 0 0;padding:30px 19px 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var(--line);display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}.lesson-header{display:flex;justify-content:space-between;align-items:start;gap:20px}.lesson-header h1{font-size:clamp(30px,4vw,48px);letter-spacing:-1.8px;line-height:1.12;max-width:750px;font-weight:550;margin:14px 0}.lesson-header p{color:var(--muted);max-width:680px;font-size:14px}.lesson-header .eyebrow{color:#607e38}.lesson-meta{display:flex;gap:9px;flex-wrap:wrap;margin:19px 0 28px}.pill{font-size:10px;padding:5px 11px;border-radius:20px;border:1px solid var(--line);background:#fff}.lesson-columns{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:23px;align-items:start}.lesson-body{min-width:0}.panel{border:1px solid var(--line);border-radius:15px;background:white;padding:25px;margin-bottom:18px}.panel h2{font-size:20px;line-height:1.3;letter-spacing:-.5px;margin:0 0 15px}.panel h3{font-size:15px;margin:20px 0 8px}.panel p,.panel li{font-size:13px;line-height:1.8}.panel 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li{font-size:11px}.side-panel ul{padding-left:15px}.side-panel .eyebrow{font-size:9px;color:var(--muted)}.side-panel a{overflow-wrap:anywhere}.check-panel{background:#eaf1df}.lesson-aside{position:sticky;top:20px}.detail{border-top:1px solid var(--line);padding:14px 0}.detail summary{cursor:pointer;font-size:13px;font-weight:650;list-style:none;display:flex;justify-content:space-between;gap:15px}.detail summary:after{content:'+';color:var(--muted)}.detail[open] summary:after{content:'−'}.detail-content{padding-top:9px}.detail-content a{font-size:12px}.detail-content p{font-size:12px}.lesson-pagination{display:flex;justify-content:space-between;gap:12px;margin-top:25px}.quote{font-family:Georgia,serif;font-style:italic;font-size:20px!important;color:var(--forest)!important}.timer-bar{position:fixed;bottom:22px;left:calc(50% + 125px);transform:translateX(-50%);z-index:30;background:#193b30;color:#fff;border:1px solid #4c6956;padding:12px 17px;border-radius:13px;box-shadow:0 6px 25px #193b3040;display:flex;align-items:center;justify-content:space-between;gap:24px;min-width:360px}.timer-bar>div{display:flex;align-items:center;gap:12px}.timer-dot{height:7px;width:7px;background:var(--lime);border-radius:50%}.timer-bar strong{font-size:11px}.timer-bar output{font-family:ui-monospace,monospace;font-size:19px;color:var(--lime)}.timer-bar button{border:1px solid #617b65;border-radius:6px;padding:5px 10px;background:transparent;color:#fff;font-size:11px}.toast{position:fixed;bottom:85px;left:50%;transform:translateX(-50%);z-index:40;background:#253e32;color:#fff;font-size:12px;padding:12px 20px;border-radius:10px;max-width:90vw}.schedule{display:flex;gap:4px;height:7px;margin:14px 0}.schedule span{background:#b6ca8f;border-radius:3px}.schedule span:nth-child(3n){background:#bcb2d9}.schedule span.break{background:#d9dcd1}.schedule-caption{display:flex;justify-content:space-between;color:var(--muted);font-size:10px}.resource-list{display:grid;gap:9px}.resource-list 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@media(min-width:1600px){main{padding-top:50px}.hero{padding:52px}.hero-art{max-width:440px}}
@media(max-width:1150px){.sidebar{width:220px;padding:25px 14px}.workspace{margin-left:220px}main{padding:28px}.topbar{padding:0 28px}.hero{padding:30px;grid-template-columns:1.15fr .85fr}.hero h1{font-size:45px}.browser-content{padding:20px}.browser-content h3{font-size:22px}.proof-badge{padding:11px}.lesson-columns{grid-template-columns:minmax(0,1fr) 240px;gap:15px}.panel{padding:20px}.timer-bar{left:calc(50% + 110px)}.page-footer{margin:0 28px}}
@media(max-width:850px){.sidebar{position:static;width:auto;display:block;padding:17px 23px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:21px}.course-label,.sidebar-bottom{display:none}nav{display:flex;overflow-x:auto;margin-top:15px;padding-bottom:3px;gap:5px}.nav-link{white-space:nowrap;padding:9px 12px;font-size:11px;background:var(--paper)}.nav-num{min-width:auto}.workspace{margin-left:0}.topbar{height:65px}.lesson-columns{grid-template-columns:1fr}.lesson-aside{position:static;display:grid;grid-template-columns:1fr 1fr;gap:15px}.lesson-aside .panel{margin:0}.lesson-aside .panel:last-child{grid-column:1/-1}.hero h1{font-size:44px}.timer-bar{left:50%}.page-footer{margin-top:25px}.toolbar>span{display:none}.hero{min-height:355px}}
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@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
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.simple-lab-content{max-width:850px;margin:auto}.simple-lab-list{max-width:950px}.simple-lab-row{display:flex;align-items:center;gap:20px;text-decoration:none;margin:12px 0;padding:20px}.simple-lab-row>span{font-size:24px;color:#6a7f61}.simple-lab-row>div{flex:1}.simple-lab-row h2{font-size:20px;margin:0}.simple-lab-row p{margin:4px 0}.simple-lab-row small{white-space:nowrap}.simple-lab-content summary{cursor:pointer;font-weight:650}.simple-lab-content .prompt p,.detailed-prompt{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit}.simple-lab-content .panel{margin-bottom:18px}@media(max-width:600px){.simple-lab-row{gap:12px;padding:16px}.simple-lab-row small{white-space:normal}}