@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');
:root{--ink:#213c38;--muted:#6b7c76;--green:#246c55;--line:#dce5de;--cream:#f6f7f1}*{box-sizing:border-box}body{margin:0;font-family:'DM Sans',sans-serif;color:var(--ink);background:var(--cream)}header{height:76px;display:flex;align-items:center;gap:24px;padding:0 30px;border-bottom:1px solid var(--line);background:#fff}.brand{font-size:22px;text-decoration:none;color:var(--ink)}.brand b{font-weight:500}.module{font-size:11px;letter-spacing:2px;color:var(--muted)}header button{margin-left:auto}button{font:inherit;border:1px solid var(--line);border-radius:7px;background:white;padding:9px 13px;color:var(--ink);cursor:pointer}button:hover{background:#eaf1eb}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #dba849;outline-offset:2px}#progress{margin-left:auto;font-size:13px;color:var(--green)}.layout{display:grid;grid-template-columns:228px 1fr;min-height:calc(100vh - 76px)}nav{padding:26px 14px;border-right:1px solid var(--line);background:#edf1e9}.navtitle{font-size:10px;letter-spacing:1.5px;margin:0 10px 20px;color:var(--muted)}#path button{display:flex;width:100%;text-align:left;align-items:center;gap:10px;background:transparent;border:0;font-size:12px;padding:9px 8px;margin:2px 0}#path button.active{background:#d9e7da;color:#174e3d;font-weight:bold}#path .num{border:1px solid #c4d4c7;width:23px;height:23px;border-radius:50%;display:grid;place-items:center;font-size:10px;flex-shrink:0}.done .num{background:var(--green);color:white}.navfoot{font-size:11px;line-height:1.8;margin:25px 10px;color:var(--muted)}main{padding:25px 28px}.lessonbar{display:flex;justify-content:space-between;font-size:11px;letter-spacing:1px;color:var(--muted);margin-bottom:18px}.workspace{display:grid;grid-template-columns:minmax(310px,.85fr) minmax(430px,1.15fr);gap:26px;max-width:1450px;margin:auto}article{background:white;border:1px solid var(--line);border-radius:14px;padding:28px;align-self:start}h1{font-size:30px;line-height:1.16;letter-spacing:-1px;margin:12px 0 20px}.eyebrow{font-size:11px;color:var(--green);letter-spacing:1.5px;text-transform:uppercase}p,li{font-size:14px;line-height:1.7}h3{font-size:14px;margin:22px 0 8px}code,pre,textarea{font-family:'JetBrains Mono',monospace}code{background:#eef3ec;padding:2px 4px;border-radius:3px;font-size:12px}article pre{white-space:pre-wrap;background:#edf3ed;padding:15px;border-radius:8px;font-size:12px;line-height:1.8}.predict{border-left:3px solid #dca958;padding:9px 14px;background:#fcf7e9;margin:18px 0}.task{background:#eff6f0;padding:16px;border-radius:9px;border:1px solid #dbe9de}.task p{margin:8px 0}.target{color:var(--muted);font-size:12px}details{margin:20px 0;font-size:13px}summary{cursor:pointer;color:var(--green);font-weight:bold}#hint{line-height:1.7;margin-top:12px}#hint button{margin-top:10px}.lessonnav{display:flex;justify-content:space-between;gap:6px;margin-top:20px}#feedback{font-size:13px;line-height:1.6;padding:0}#feedback:not(:empty){padding:14px;border-radius:7px;background:#fdf2d8}.lab{border:1px solid #2d4645;border-radius:12px;overflow:hidden;background:#122a2d;align-self:start}.editorhead{display:flex;justify-content:space-between;padding:16px 19px;color:#b5d4c7;border-bottom:1px solid #30484b;font-size:12px}.editorhead span:first-child{color:#fff}.codewrap{display:flex;height:270px;background:#142e31}#lines{padding:18px 12px;margin:0;color:#5e8080;line-height:1.8;font-size:14px;overflow:hidden;text-align:right;min-width:44px}textarea{flex:1;min-width:0;resize:vertical;border:0;outline:0;background:transparent;color:#e1f2d8;padding:18px 14px;font-size:14px;line-height:1.8;tab-size:4;white-space:pre;overflow:auto}.tools{display:flex;flex-wrap:wrap;gap:6px;padding:12px;background:#1a3537}.tools button{background:#244245;border-color:#355154;color:#dbe9df;font-size:11px;padding:8px 10px}.tools .primary{background:#e5b359;color:#172e2d;border:0}.tools .green{background:#b9dfb8;color:#173e2c;border:0}.bankhead{padding:16px 16px 10px;font-size:10px;letter-spacing:1px;color:#a6c7b9;display:flex;flex-wrap:wrap;gap:9px}.bankhead span{font-size:10px;color:#779c95;letter-spacing:0}.bankhead label{margin-left:auto}#bank{padding:0 14px 14px;display:flex;gap:7px;flex-wrap:wrap}#bank button{font-family:'JetBrains Mono';font-size:11px;color:#d9ecdf;background:#24413f;border:1px dashed #58786a;white-space:pre-wrap;text-align:left;cursor:grab}.terminalhead{display:flex;justify-content:space-between;align-items:center;color:#8cae9b;font-size:10px;letter-spacing:1px;border-top:1px solid #30484b;padding:10px 17px}.terminalhead button{background:transparent;border:0;color:#8cae9b;font-size:11px;padding:3px}#terminal{margin:0;min-height:155px;max-height:280px;overflow:auto;padding:10px 18px 20px;white-space:pre-wrap;color:#d5e7db;font-size:13px;line-height:1.8}.labfoot{font-size:10px;color:#81a49a;padding:12px 16px;background:#193436}dialog{max-width:650px;border:1px solid var(--line);border-radius:15px;padding:28px;color:var(--ink)}dialog::backdrop{background:#102d2bb0}@media(max-width:1100px){.layout{grid-template-columns:180px 1fr}main{padding:20px 16px}.workspace{grid-template-columns:1fr}h1{font-size:27px}}@media(max-width:600px){header{padding:0 14px;gap:10px;height:auto;min-height:70px;flex-wrap:wrap}.brand{font-size:18px}.module{display:none}.layout{display:block}nav{padding:10px;border-right:0}.navtitle,.navfoot{display:none}#path{display:flex;overflow:auto}#path button{min-width:145px}main{padding:14px}article{padding:20px}.codewrap{height:250px}.lessonbar{font-size:9px}#progress{font-size:10px}}
[hidden]{display:none!important}

/* Checkpoints above a single three-column learning workspace. */
.layout{display:block}.layout>nav{padding:12px 22px;border-right:0;border-bottom:1px solid var(--line);background:#edf1e9}.layout>nav .navtitle{display:block;margin:0 0 9px;font-size:10px}.navfoot{display:none}#path{display:flex;flex-wrap:wrap;gap:5px}#path button{display:flex;flex:0 0 auto;width:auto;max-width:none;font-size:11px;white-space:nowrap;padding:6px 9px;margin:0;min-width:0}#path .num{width:21px;height:21px}main{padding:20px 22px}.workspace{display:grid;grid-template-columns:minmax(260px,.9fr) 210px minmax(360px,1.35fr);gap:18px;max-width:1720px;align-items:start}article{min-width:0;padding:23px}.lab{min-width:0}.toolbox{min-width:0;background:#fff;border:1px solid #c9d8ce;border-radius:12px;padding:18px 14px;align-self:stretch;color:#284039}.toolbox-title{font-size:16px;letter-spacing:.4px;font-weight:700}.toolbox-help{font-size:12px;line-height:1.6;color:#53675b;margin:9px 0}.toolbox-toggle{font-size:12px;display:block;margin:12px 0 18px}.toolbox #bank{display:block;padding:0}.piece-group{margin-bottom:21px}.piece-group h3{font-size:13px;margin:0 0 10px;padding:7px 9px;border-radius:5px}.piece-list{display:flex;gap:7px;flex-wrap:wrap}.toolbox #bank button{border:0;border-radius:6px;padding:10px 11px;font-size:13px;color:#fff;white-space:pre;text-align:left;cursor:grab;font-family:'JetBrains Mono',monospace}.functions h3{background:#eee6fc;color:#593586}.toolbox #bank .functions button{background:#7255aa}.variables h3{background:#fff0d9;color:#8a4b0b}.toolbox #bank .variables button{background:#a95d17}.operators h3{background:#e5f3e8;color:#245c3b}.toolbox #bank .operators button{background:#307550}.syntax h3{background:#e5f0f8;color:#285874}.toolbox #bank .syntax button{background:#326b89}.toolbox #bank button:hover{filter:brightness(1.13)}.editorhead{font-size:13px}.codewrap{height:330px}#terminal{min-height:185px}.tools{gap:7px}.tools button{font-size:12px}
@media(max-width:1000px){.workspace{grid-template-columns:minmax(230px,.85fr) 170px minmax(300px,1.15fr);gap:12px}main{padding:14px}.toolbox{padding:14px 10px}.toolbox #bank button{font-size:12px;padding:9px}article{padding:18px}h1{font-size:25px}}
@media(max-width:760px){.workspace{grid-template-columns:140px minmax(0,1fr)}.workspace>article{grid-column:1/-1}.workspace>.toolbox{grid-column:1}.workspace>.lab{grid-column:2}.layout>nav{padding:10px 14px}#path button{font-size:10px}.toolbox-title{font-size:13px}.piece-group h3{font-size:12px}.toolbox #bank button{padding:7px;font-size:11px}.codewrap textarea{font-size:12px;padding-left:8px}.codewrap #lines{font-size:12px;min-width:28px;padding-left:5px;padding-right:5px}.codewrap{height:280px}}

.toolbox-toggle{width:100%;background:#edf3ec;border:1px solid #c9d8ce;text-align:center;font-weight:600;padding:9px 8px}.piece-group h3{cursor:default}.compressed .piece-group .piece-list{display:none}.compressed .piece-group:hover .piece-list,.compressed .piece-group:focus-within .piece-list{display:flex}.compressed .piece-group h3::after{content:' ▸';float:right}.compressed .piece-group:hover h3::after,.compressed .piece-group:focus-within h3::after{content:' ▾'}.compressed .piece-group{padding-bottom:7px;margin-bottom:10px}

.category-title{cursor:pointer!important}.compressed .piece-group.pinned .piece-list{display:flex}.compressed .piece-group.pinned h3::after{content:' ▾'}.piece-group.pinned h3{box-shadow:inset 0 0 0 1px currentColor}

#bank .piece-group.closed .piece-list{display:none}#bank .piece-group.closed h3::after{content:' ▸';float:right}.piece-group.closed h3{box-shadow:none}

.mc-card{margin:24px 0;background:#faf8f0;border:1px solid #ded9c7;padding:18px;border-radius:12px}.mc-card h2{font-size:21px;line-height:1.25;margin:10px 0 18px}.mc-question{font-weight:600}.mc-card fieldset{border:0;padding:0;margin:16px 0}.mc-option{display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid #d7ddcf;border-radius:7px;padding:12px;margin:8px 0;font-size:13px;line-height:1.5;cursor:pointer}.mc-option input{margin:4px 0 0;accent-color:#246c55;flex-shrink:0}.mc-option.correct{background:#e8f4e7;border-color:#649862}.mc-option.incorrect{background:#fceee9;border-color:#bd7c6b}.mc-explanation{background:#fff;border-left:3px solid #dca958;padding:12px;font-size:13px}.mc-explanation p{margin:5px 0;font-size:13px}.mc-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:15px}.mc-actions button{font-size:12px}.mc-actions button:last-child{background:#d9ebd6}.mc-foot{font-size:11px;color:#6b7c76}.quiz-complete{border:1px solid #c2d9bb;background:#edf6e9;padding:15px;border-radius:9px;margin:22px 0;font-size:13px}.quiz-complete p{font-size:12px}.quiz-review{border-bottom:1px solid #d0dfcc;padding:14px 0}.quiz-lock{padding:20px;background:#eaf2e3;color:#294737;font-size:14px;line-height:1.6;border-bottom:1px solid #65866b}.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}