@import url('https://fonts.googleapis.com/css2?family=Barlow+Condensed:wght@500;600;700&family=DM+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');
:root{--paper:#f5f1e7;--panel:#fbf8f0;--ink:#26312f;--muted:#797e73;--line:#dcdace;--berry:#a83353;--green:#46705a;--mono:'IBM Plex Mono',monospace;--head:'Barlow Condensed','Arial Narrow',sans-serif;--sans:'DM Sans',sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:14px}button,a,input{touch-action:manipulation}button{font:inherit;cursor:pointer;color:inherit}button:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--berry);outline-offset:4px}button{border:0;background:none}a{color:var(--berry)}.rail{position:fixed;inset:0 auto 0 0;width:74px;z-index:5;border-right:1px solid var(--line);background:#eeeadf;display:flex;align-items:center;flex-direction:column}.rail-brand{font:bold 34px Georgia;color:var(--berry);text-decoration:none;text-align:center;margin:24px 0 45px;line-height:.7}.rail-brand span{display:block;font:9px var(--mono);letter-spacing:3px;margin-top:12px}.rail nav{display:grid;gap:13px}.navbtn{width:44px;height:44px;border-radius:10px;font-size:25px;color:#7e8176}.navbtn:hover,.navbtn.active{background:#e2dfd2;color:var(--berry)}.rail-bottom{margin-top:auto;writing-mode:vertical-rl;transform:rotate(180deg);font:9px var(--mono);letter-spacing:2px;line-height:1.8;padding:30px 0;color:var(--muted)}.shell{margin-left:74px;padding:27px 32px 0;max-width:1850px}header{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:27px}.brand{display:flex;align-items:center;gap:15px}.berry{font-size:55px;color:var(--berry);line-height:1}.brand h1{font:600 clamp(22px,2.25vw,35px) var(--head);letter-spacing:2.5px;margin:0}.brand-dot{color:var(--berry)}.brand p{font:10px var(--mono);letter-spacing:3.5px;color:#8b8d7d;margin:7px 0 0}.brand i{font-style:normal;margin:0 8px}.header-right{display:flex;align-items:center;gap:23px}.eyebrow{font:10px var(--mono);letter-spacing:1.4px;color:var(--muted)}.progressbox{min-width:200px}.progressbox>div{display:flex;align-items:center;gap:13px;margin-top:8px}.progressbox strong{font:12px var(--mono)}.progress-track{width:136px;height:5px;background:#deded1;border-radius:8px;overflow:hidden}.progress-track i{display:block;width:0;height:100%;background:var(--berry);transition:width .4s}.outline{border:1px solid var(--line);background:#faf7ef;border-radius:7px;padding:10px 13px}.small{font:11px var(--mono)}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 365px;gap:24px}.explorer{border:1px solid #d4d5c8;border-radius:13px;overflow:hidden;min-width:0;background:#eeeee3;display:flex;flex-direction:column}.stage-heading{display:flex;justify-content:space-between;align-items:center;padding:18px 22px;position:relative;z-index:1}.pill{display:inline-flex;align-items:center;gap:7px;font:9px var(--mono);letter-spacing:1px}.pill i,.status-dot{width:6px;height:6px;display:inline-block;border-radius:50%;background:var(--green)}.model{font:9px var(--mono);color:#8b9083;letter-spacing:1px}.stage{position:relative;min-height:500px;flex:1;overflow:hidden;perspective:1100px}.stage-grid{position:absolute;inset:0;background-image:radial-gradient(#a2aa966b .7px,transparent .7px);background-size:22px 22px;mask-image:linear-gradient(transparent,black 25%,black 85%,transparent)}.stage-caption{position:absolute;top:10px;left:28px;z-index:1;pointer-events:none}.stage-caption>span{font:9px var(--mono);letter-spacing:1.4px;color:var(--berry)}.stage-caption h2{font:600 clamp(34px,3.3vw,52px)/.98 var(--head);letter-spacing:-.3px;margin:14px 0 11px}.stage-caption p{font-size:11px;max-width:260px;color:#7c8374;margin:0}.board-wrap{position:absolute;inset:105px 30px 95px;display:flex;align-items:center;justify-content:center;perspective:1200px;touch-action:pan-y;cursor:grab}.board{width:510px;max-width:90%;aspect-ratio:1.52;transform:rotateX(35deg) rotateZ(-24deg) scale(.93);transform-style:preserve-3d;filter:drop-shadow(-22px 40px 20px #2e3e2b40);transition:transform .35s ease;user-select:none}.board svg{width:100%;height:100%;overflow:visible}.board .part{cursor:pointer;outline:none}.part:hover .part-body,.part:focus .part-body{stroke:#ffdf80;stroke-width:3}.board svg text{font-family:var(--mono)}.board-label{position:absolute;font:9px var(--mono);letter-spacing:1px;color:#6e7e69;pointer-events:none}.label-top{top:125px;right:30px}.label-top span{display:block;text-align:right;font-size:25px}.label-bottom{bottom:85px;left:28px}.label-bottom span{display:block;font-size:8px;color:#a0a795;margin-top:7px}.component-card{position:absolute;right:18px;bottom:70px;width:225px;border-left:2px solid var(--berry);background:#f9f8efed;padding:12px 15px;box-shadow:0 5px 18px #27352b08}.component-card strong{display:block;font:600 20px var(--head);margin:6px 0}.component-card p{font-size:11px;line-height:1.6;margin:0;color:#727a6d}.viewtools{position:absolute;left:24px;bottom:17px;display:flex;gap:5px}.viewtools button{background:#faf9f0;border:1px solid #d1d6c4;width:33px;height:31px;border-radius:5px;font-size:18px}.viewtools button:hover{background:#e0e5d5}.stage-footer{padding:14px 20px;border-top:1px solid #d6dacb;display:flex;justify-content:space-between;font:8px var(--mono);color:#7e8677;gap:10px;letter-spacing:.5px}.stage-footer b{margin:0 5px}.stage-footer .status-dot{margin-right:5px}.learning-panel{min-width:0}.panel-top{display:flex;justify-content:space-between;align-items:center;margin:3px 0 10px}.tag{font:8px var(--mono);letter-spacing:1px;color:var(--berry);background:#a833530b;padding:5px 7px;border-radius:4px}.learning-panel>h2{font:600 32px var(--head);margin:0 0 17px}.tabs{display:flex;border-bottom:1px solid var(--line);gap:26px}.tabs button{padding:0 0 12px;font:11px var(--mono);color:var(--muted);position:relative}.tabs button[aria-selected=true]{color:var(--ink);font-weight:600}.tabs button[aria-selected=true]:after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--berry)}.lesson-content{min-height:194px;max-height:245px;overflow:auto;padding:17px 0 13px;font-size:12px;line-height:1.7}.lesson-content p{margin:0 0 12px;color:#687064}.takeaways{display:grid;gap:8px}.takeaways div{display:flex;gap:10px;font-size:11px}.takeaways span{color:var(--green);font-family:var(--mono)}.callout{border-left:2px solid #b49762;padding:8px 10px;background:#eae2ce5c;font-size:10px;line-height:1.6;margin-top:12px}.code-card{border:1px solid #d3d5c9;border-radius:8px;background:#f9f8ef;overflow:hidden}.code-head{display:flex;justify-content:space-between;align-items:center;padding:12px 13px;border-bottom:1px solid #e5e5d8}.code-head>div{display:flex;align-items:center;gap:8px}.code-dot{width:6px;height:6px;background:#b18b4d;border-radius:50%}.code-head b{font:10px var(--mono)}.code-head span:last-child{font:8px var(--mono);color:#9a9e8d;margin-left:8px}.code-head button{font-size:19px}.code-card pre{font:10px/1.8 var(--mono);padding:15px;margin:0;height:172px;overflow:auto;tab-size:4;color:#3c6455;white-space:pre}.code-card .comment{color:#929783}.code-footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid #e5e5d8;padding:10px 12px}.code-footer>span{font:8px var(--mono);color:#8f9585}.run{background:var(--green);color:white;font:10px var(--mono);border-radius:5px;padding:10px 14px}.run.running{background:var(--berry)}.terminal{margin-top:12px;background:#26342e;border-radius:7px;padding:12px 14px;color:#c4d6bf}.terminal-head{display:flex;justify-content:space-between;font:8px var(--mono);letter-spacing:1px;color:#a0b299}.terminal pre{font:10px/1.6 var(--mono);margin:8px 0 0;height:37px;overflow:auto;white-space:pre-wrap}.lesson-actions{display:flex;gap:8px;margin-top:15px}.primary{background:var(--ink);color:#fcf9f0;border-radius:6px;font:10px var(--mono);padding:12px 18px;flex:1;display:flex;justify-content:space-between}.primary.done{background:var(--green)}button:disabled{opacity:.35;cursor:not-allowed}.simulation-note{font-size:9px;line-height:1.6;color:#909383;margin:12px 1px 0}.course{margin:27px 0 0}.course-heading{display:flex;align-items:end;justify-content:space-between;margin-bottom:15px}.course-heading .eyebrow{font-size:8px}.course-heading h2{font:500 27px var(--head);margin:6px 0 0}.course-controls{display:flex;align-items:center;gap:8px}.course-controls span{font:10px var(--mono);color:var(--muted);margin-right:15px}.course-controls button{width:30px;height:30px;border:1px solid var(--line);border-radius:50%}.lesson-strip{display:flex;overflow:auto;gap:10px;scrollbar-width:thin;padding-bottom:12px;scroll-behavior:smooth}.lesson-card{flex:0 0 170px;min-height:92px;border:1px solid var(--line);border-radius:7px;text-align:left;padding:14px 14px;background:#faf7ef;position:relative}.lesson-card:hover{border-color:#92a48b}.lesson-card.current{border:1.5px solid var(--berry);background:#f9f2e8}.lesson-card>span{font:9px var(--mono);color:#969a8c}.lesson-card b{display:block;font:600 17px var(--head);margin-top:8px}.lesson-card .done-check{position:absolute;right:12px;top:12px;color:var(--green)}.lesson-card.current>span{color:var(--berry)}footer{display:flex;justify-content:space-between;padding:18px 0 22px;border-top:1px solid var(--line);font:8px var(--mono);color:#8c9284;margin-top:5px;letter-spacing:.5px}footer b{margin:0 8px}footer button{font:inherit;color:inherit;padding:0}.experiment{display:none;border-top:1px solid #d2d8c7;padding:16px 22px;background:#f7f8ed;grid-template-columns:1fr 1fr;align-items:center;gap:20px;min-height:132px}.experiment.visible{display:grid}.experiment h3{font:600 23px var(--head);margin:5px 0 6px}.experiment p{font-size:11px;color:#7b8473;margin:0;line-height:1.5}.sim-controls{display:grid;gap:10px}.sim-controls label{font:10px var(--mono);display:grid;gap:7px}.sim-controls input[type=range]{width:100%;accent-color:var(--berry)}.sim-device{display:flex;align-items:center;gap:18px}.led{display:inline-block;width:29px;height:39px;border-radius:18px 18px 6px 6px;background:#5d2833;border:2px solid #7b3446;position:relative}.led:after{content:'';position:absolute;bottom:-12px;left:5px;width:13px;height:10px;border-left:2px solid #777;border-right:2px solid #777}.led.on{background:var(--ledcolor,#ee566e);box-shadow:0 0 25px var(--ledcolor,#ee566e),inset 5px 0 6px #fff5}.traffic{display:flex;gap:10px;background:#27332e;padding:10px 15px;border-radius:8px}.traffic .led{width:22px;height:25px;border-radius:50%}.traffic .led:after{display:none}.push{padding:14px 22px;background:var(--berry);color:white;border-radius:7px;font:11px var(--mono)}.push.pressed{background:var(--green);transform:translateY(2px)}.meter{font:500 33px var(--mono);color:var(--green)}.meter small{font-size:10px;color:var(--muted)}.servo{width:65px;height:38px;background:#4275a3;border:3px solid #315979;position:relative;border-radius:4px}.servo i{position:absolute;width:50px;height:7px;background:#f4efdc;left:27px;top:12px;transform-origin:3px center;border:1px solid #c4c1af;transition:transform .3s}.wiring-table{border-collapse:collapse;width:100%;font-size:10px}.wiring-table th{text-align:left;font:9px var(--mono);padding:6px 5px;border-bottom:1px solid var(--line);color:var(--muted)}.wiring-table td{padding:7px 5px;border-bottom:1px solid #e4e4d7}.question{font-weight:600;margin-bottom:10px}.answers{display:grid;gap:7px}.answers button{border:1px solid var(--line);border-radius:5px;text-align:left;padding:9px 12px;font-size:11px;background:#faf8ef}.answers button.correct{background:#dae8d4;border-color:#7fa371}.answers button.wrong{background:#f0d5d7;border-color:#b96671}.feedback{margin-top:10px;font-size:11px}.pin-badge{color:var(--berry);font-family:var(--mono)}dialog{border:1px solid #cfd3c4;background:var(--paper);border-radius:14px;max-width:850px;width:calc(100% - 40px);padding:28px;color:var(--ink);max-height:90vh;overflow:auto}dialog::backdrop{background:#1c2b236e;backdrop-filter:blur(5px)}.modal-head{display:flex;justify-content:space-between;align-items:start;padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:20px}.modal-head h2{font:600 34px var(--head);margin:7px 0 0}.modal-head button{font-size:30px;line-height:1}.modal-intro{color:#6f7968;font-size:12px;line-height:1.7}.modal-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.component-item{border:1px solid var(--line);border-radius:7px;background:#fbf9f1;padding:15px;text-align:left}.component-item b{font:600 22px var(--head);display:block;margin-bottom:6px}.component-item p{font-size:11px;line-height:1.6;color:#6f7968;margin:0}.pin-map{display:grid;grid-template-columns:1fr 1fr;gap:4px 10px;max-width:570px;margin:22px auto}.pin{display:flex;align-items:center;gap:10px;border-radius:4px;border:1px solid var(--line);padding:7px 12px;font:10px var(--mono);background:#faf9f0;text-align:left}.pin:nth-child(odd){flex-direction:row-reverse}.pin>i{width:14px;height:14px;border-radius:50%;background:#56806a}.pin.power>i{background:#c78051}.pin.ground>i{background:#39423d}.pin.reserved>i{background:#a49bb6}.pin.selected{outline:2px solid var(--berry);background:#f2e1df}.pin>small{color:#8f9789}.pin-search{padding:10px 13px;background:#fcfaf2;border:1px solid var(--line);border-radius:6px;color:var(--ink);width:100%;font:12px var(--mono)}.pin-details{padding:16px;background:#e6eadc;border-radius:7px;line-height:1.7;font-size:12px;min-height:68px}.settings-row{display:flex;justify-content:space-between;align-items:center;padding:18px 0;border-bottom:1px solid var(--line);gap:18px;font-size:12px}.settings-row input{accent-color:var(--berry)}.resource{display:block;border-bottom:1px solid var(--line);padding:17px 0;text-decoration:none;font-weight:600;font-size:13px}.resource small{display:block;font-weight:400;color:var(--muted);font-size:11px;margin-top:6px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%) translateY(100px);background:var(--ink);color:var(--paper);padding:13px 22px;border-radius:7px;font:11px var(--mono);z-index:50;transition:.25s;pointer-events:none}.toast.show{transform:translateX(-50%) translateY(0)}.boot-lines{font:10px/1.8 var(--mono);background:#27382e;color:#b7d4ab;border-radius:6px;padding:12px;min-height:65px}.no-motion *{animation:none!important;scroll-behavior:auto!important;transition:none!important}@media(min-width:1500px){.workspace{grid-template-columns:minmax(0,1fr) 410px}.stage{min-height:580px}.board{width:620px}.stage-caption h2{font-size:59px}.lesson-content{max-height:260px;min-height:210px}.code-card pre{height:200px}}@media(max-width:1150px){.shell{padding:24px 22px 0}.workspace{grid-template-columns:minmax(0,1fr) 330px;gap:18px}.header-right .small{display:none}.stage{min-height:500px}.board-wrap{inset:150px 0 120px}.component-card{width:190px;bottom:60px}.stage-caption h2{font-size:40px}.label-top{top:190px;font-size:8px;right:15px}.label-bottom{bottom:165px;font-size:8px}.stage-footer>span:last-child{display:none}.experiment{grid-template-columns:1fr;gap:12px}.brand h1{font-size:27px}.brand p{letter-spacing:2px}.progressbox{min-width:160px}.progress-track{width:90px}}@media(max-width:850px){.rail{width:56px}.navbtn{width:38px}.shell{margin-left:56px;padding:20px 16px 0}.workspace{grid-template-columns:1fr}.learning-panel{display:grid;grid-template-columns:1fr 1fr;column-gap:24px}.panel-top,.learning-panel>h2,.tabs,.simulation-note,.lesson-actions{grid-column:1/-1}.lesson-content{grid-column:1;grid-row:4/6;max-height:none}.code-card{grid-column:2;grid-row:4;margin-top:16px}.terminal{grid-column:2}.stage{min-height:530px}.board{width:510px}.board-wrap{inset:100px 20px 80px}.label-top{top:130px}.label-bottom{bottom:100px}.component-card{width:225px}.progressbox{min-width:140px}.eyebrow{font-size:9px}.brand h1{font-size:25px;letter-spacing:1px}.berry{font-size:42px}.brand p{font-size:8px;letter-spacing:2px}.stage-caption h2{font-size:45px}.experiment{grid-template-columns:1fr 1fr}.course-heading h2{font-size:25px}footer{gap:20px;line-height:1.8}.course-controls span{display:none}}@media(max-width:560px){.rail{position:fixed;top:auto;bottom:0;left:0;right:0;width:100%;height:57px;flex-direction:row;justify-content:center;border-right:0;border-top:1px solid var(--line)}.rail nav{display:flex;gap:22px}.rail-brand,.rail-bottom{display:none}.shell{margin:0;padding:20px 14px 70px}.header-right{gap:0}.progressbox{min-width:68px}.progressbox .eyebrow{display:none}.progressbox>div{flex-direction:column-reverse;gap:5px;align-items:end}.progress-track{width:55px}.brand{gap:8px}.brand h1{font-size:25px;letter-spacing:.5px}.brand p{font-size:7px;letter-spacing:1.5px}.berry{font-size:38px}.brand i{margin:0 3px}header{gap:8px;margin-bottom:20px}.stage-heading{padding:15px}.model{display:none}.pill{font-size:8px}.stage{min-height:490px}.stage-caption{left:19px;top:10px}.stage-caption h2{font-size:39px}.stage-caption p{font-size:10px}.board-wrap{inset:125px 0 105px}.board{max-width:87%;width:400px}.component-card{width:195px;right:12px;bottom:55px;padding:9px 12px}.component-card p{font-size:10px}.component-card strong{font-size:18px}.component-card .eyebrow{font-size:8px}.label-top{top:150px;right:15px;font-size:7px}.label-bottom{bottom:150px;left:15px;font-size:7px}.viewtools{left:15px;bottom:12px}.experiment{grid-template-columns:1fr;gap:14px;padding:16px}.stage-footer{padding:12px 15px}.learning-panel{display:block;margin-top:5px}.lesson-content{min-height:0;max-height:300px}.code-card{margin-top:12px}.code-card pre{height:190px;font-size:11px}.learning-panel>h2{font-size:34px}.simulation-note{font-size:10px}.lesson-actions{margin-top:13px}.course-heading .eyebrow{font-size:7px;letter-spacing:.7px}.course-heading h2{font-size:24px}.course-heading{gap:10px}.lesson-card{flex-basis:150px}footer{display:block;font-size:7px}footer>span{display:block;margin-top:7px}dialog{padding:20px}.modal-grid{grid-template-columns:1fr}.pin{padding:7px 6px;font-size:8px;gap:5px}.pin>i{width:10px;height:10px}.pin-map{gap:4px}.sim-device{gap:15px}}@media(prefers-reduced-motion:reduce){*{animation:none!important;scroll-behavior:auto!important;transition:none!important}}
/* Executable Python workbench */
.workspace{grid-template-columns:minmax(0,1fr) 410px}.code-card{background:#f8f8ef}.editor-label{display:flex;justify-content:space-between;padding:9px 12px 0;color:#909985;font:8px var(--mono);gap:8px}.editor-wrap{display:flex;height:260px;margin-top:8px;background:#fafaf1;overflow:hidden}.editor-wrap textarea{width:100%;resize:none;border:0;outline:none;padding:8px 12px 14px 7px;background:transparent;color:#315d4c;font:11px/1.8 var(--mono);white-space:pre;tab-size:4;overflow:auto;min-width:0}.editor-wrap textarea:focus-visible{outline:0;background:#fffff844}.editor-wrap #lineNumbers{font:11px/1.8 var(--mono);color:#adb39e;text-align:right;padding:8px 8px 0 12px;min-width:34px;overflow:hidden;white-space:pre;user-select:none}.editor-tools{display:flex;gap:15px;flex-wrap:wrap;padding:9px 12px;background:#eff1e5;border-top:1px solid #e2e5d5}.editor-tools button{font:9px var(--mono);padding:0;color:#63745e}.code-card.expanded{position:fixed;inset:6vh 10vw;z-index:20;box-shadow:0 0 0 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/* Wiring directly on the board's GPIO header. */
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/* Readable breadboard paths and a non-destructive connection walkthrough. */
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#wiringSvg{display:block}
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