:root{--ink:#183c36;--muted:#64766d;--green:#176e59;--line:#d6dfd3;--paper:#f4f5ed;--pale:#e9eee2;--gold:#c5a452}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.55 'Segoe UI',Arial,sans-serif}header{max-width:1540px;margin:auto;display:flex;justify-content:space-between;align-items:center;padding:30px 30px 24px}.brand{display:flex;gap:15px;align-items:center}.chip{background:var(--ink);color:#fff;font-size:26px;font-weight:700;width:59px;height:62px;display:grid;place-content:center;border-radius:9px;line-height:1.05;text-align:center;box-shadow:inset 0 0 0 5px #31564b}.chip span{font-size:12px;color:#bcd1aa;letter-spacing:3px}h1{font-size:30px;font-weight:400;letter-spacing:-1px;margin:0}h1 strong{font-weight:650}.brand p{color:var(--muted);margin:1px 0;font-size:12px}.badge{font-size:10px;letter-spacing:2px;color:var(--muted);text-align:right}.badge b{display:block;font-size:11px;color:var(--ink);margin-top:3px}main{max-width:1540px;margin:auto;padding:0 30px 22px}button,select,input{font:inherit}button,select{border:1px solid #bdcdbd;border-radius:5px;color:var(--ink);background:#fff;padding:7px 11px}button{cursor:pointer;font-weight:600;font-size:12px}button:hover{background:#e4eddf;border-color:#86a68c}button:disabled{opacity:.42;cursor:default}button.primary{background:var(--green);border-color:var(--green);color:#fff}button.primary:hover{background:#105740}button:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #be9836;outline-offset:2px}.toolbar,.machine-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.toolbar{border-top:1px solid var(--line);padding:15px 0}.toolbar>div,.machine-toolbar>div{display:flex;align-items:center;gap:7px;flex-wrap:wrap}label{font-size:12px}label select{margin-left:5px}.tutorial,.reference{border:1px solid var(--line);background:white;border-radius:8px;margin-bottom:18px;overflow:hidden}.section-title{display:flex;justify-content:space-between;align-items:center;padding:17px 23px;background:var(--pale);gap:20px}.eyebrow{font-size:9px;font-weight:700;letter-spacing:1.8px;color:#5b7c63}h2{font-size:17px;margin:0;font-weight:650}.section-title h2{margin-top:2px}.section-title select{max-width:340px}.lesson-grid{padding:20px 23px;display:grid;grid-template-columns:1.65fr 1fr;gap:35px}h3{font-size:20px;margin:0 0 8px;font-weight:600}.lesson-grid p{margin:8px 0;color:#4b6258;font-size:13px}.lesson-grid .goal{color:var(--green);font-weight:600}.exercise{border-left:1px solid var(--line);padding-left:25px}summary{cursor:pointer;font-size:12px;color:var(--green)}details{margin:10px 0}.exercise button{margin-top:8px}.reference{padding:20px 23px}.reference p{max-width:1100px;font-size:13px}.reference table{max-width:1100px}.reference td:first-child{white-space:nowrap;font-family:Consolas,monospace}.machine-toolbar{background:#e3eada;border:1px solid var(--line);border-radius:7px 7px 0 0;padding:12px 15px}.machine-toolbar label{display:flex;align-items:center;gap:4px}#status{background:#fff;border:1px solid var(--line);border-top:0;padding:9px 15px;font-size:12px;margin-bottom:18px;color:var(--green)}#status.error{color:#a02e26;background:#fff1ea}.workspace{display:grid;grid-template-columns:minmax(350px,1.5fr) minmax(230px,.8fr) minmax(280px,1fr);gap:16px;align-items:stretch}.panel{border:1px solid var(--line);background:#fff;border-radius:7px;overflow:hidden}.panel-heading{display:flex;align-items:center;justify-content:space-between;padding:13px 16px;background:#f9faf5;border-bottom:1px solid var(--line);gap:8px}.panel-heading h2{font-size:14px}.panel-heading>span{font-size:9px;letter-spacing:1.5px;color:var(--muted)}#source{width:100%;height:255px;resize:vertical;border:0;border-bottom:1px solid var(--line);padding:16px 19px;font:14px/1.8 Consolas,'Courier New',monospace;color:#244c40;background:#fcfdf9;tab-size:4;display:block}.listing-wrap{height:240px;overflow:auto}table{width:100%;border-collapse:collapse;font:12px/1.4 Consolas,monospace}th{text-align:left;color:#637563;background:#f2f5ed;font:10px 'Segoe UI',sans-serif;text-transform:uppercase;letter-spacing:.6px;padding:9px 12px;position:sticky;top:0}td{padding:6px 12px;border-bottom:1px solid #edf0e7;vertical-align:top}.listing th:first-child{width:45px}.listing th:nth-child(2){width:60px}.listing td:last-child{white-space:pre}.listing tr.next{background:#e3f0df;box-shadow:inset 3px 0 var(--green)}.listing tr.last td:last-child{color:#19654c}.bp{border:0;background:transparent;padding:0;width:20px;color:#b5c2ae;font-size:13px}.bp.on{color:#bd4b39}.hint{font-size:10px;color:var(--muted);padding:8px 13px;margin:0}.pc{background:#f0f4e9;display:flex;flex-direction:column;margin:14px;border:1px solid #dae2cd;border-radius:5px;padding:12px 16px}.pc span{font-size:9px;letter-spacing:1.6px;color:var(--muted)}.pc strong{font:34px/1.5 Consolas,monospace}.pc small{font-size:10px;color:var(--muted)}.flags{display:flex;gap:8px;padding:0 14px 14px}.flag{flex:1;text-align:center;font:12px Consolas,monospace;border:1px solid var(--line);padding:5px;border-radius:4px;color:#8c9789}.flag.active{background:var(--green);color:#fff}.registers{padding:0 14px 14px}.register{display:flex;justify-content:space-between;gap:8px;border-top:1px solid #e7ece0;padding:7px 9px;font:12px Consolas,monospace}.register span{color:var(--muted)}.register strong{font-weight:500;overflow-wrap:anywhere;text-align:right}.register.changed{background:#fff3ce}.memory-nav{display:block;padding:12px}.memory-wrap{height:410px;overflow:auto}.memory td:last-child{overflow-wrap:anywhere}.memory-form, #memory-form{padding:12px;display:flex;gap:6px;flex-wrap:wrap;border-top:1px solid var(--line)}#memory-form label{flex:1}input{border:1px solid #c4d0bd;border-radius:4px;padding:7px;min-width:0;background:#fdfefb;color:var(--ink)}#memory-form input{width:100%;margin-top:4px;font:12px Consolas,monospace}#memory-form button{align-self:end}.bottom-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:16px;margin-top:16px}#output{background:#1e3c34;color:#e5f1d9;height:145px;overflow:auto;padding:14px;margin:0;white-space:pre-wrap;font:14px/1.6 Consolas,monospace}#output:empty:before{content:'Program output appears here';color:#9aafa0;font-size:12px}#input-form{display:flex;gap:8px;padding:12px 12px 0}#input-form input{flex:1}#trace{height:205px;overflow:auto;margin:0;padding:10px 15px;list-style:none;font:11px/1.8 Consolas,monospace}#trace li{padding:3px 0;border-bottom:1px solid #edf0e7;overflow-wrap:anywhere}#trace li:first-child{color:var(--green);font-weight:bold}.panel-heading button{font-size:10px;padding:3px 8px}footer{display:flex;justify-content:space-between;gap:10px;margin-top:22px;font-size:10px;color:var(--muted)}code{font:12px Consolas,monospace;background:#eef3e7;padding:2px 4px}a{color:var(--green)}[hidden]{display:none!important}.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}@media(min-width:1500px){.register{padding:7px 9px}}@media(max-width:1050px){.workspace{grid-template-columns:minmax(340px,1.4fr) minmax(240px,1fr)}.memory{grid-column:1/-1}.memory-wrap{height:220px}.lesson-grid{gap:20px}.badge{display:none}}@media(max-width:650px){header{padding:20px 15px}main{padding:0 12px 20px}h1{font-size:25px}.workspace,.bottom-grid,.lesson-grid{grid-template-columns:1fr}.memory{grid-column:auto}.section-title{align-items:flex-start;flex-direction:column}.section-title select{max-width:100%;width:100%}.exercise{border-left:0;border-top:1px solid var(--line);padding:15px 0 0}.toolbar select{max-width:190px}.lesson-grid{padding:15px}.registers{display:grid;grid-template-columns:1fr 1fr}.register{gap:4px}.machine-toolbar{padding:10px}.machine-toolbar button{padding:7px 9px}footer{flex-direction:column}.badge{display:none}}@media print{button,.toolbar,.machine-toolbar,#input-form,#memory-form{display:none}.workspace{display:block}.panel{break-inside:avoid;margin:10px 0}.listing-wrap,.memory-wrap,#trace,#source{height:auto;max-height:none;overflow:visible}body{background:#fff}}

.graphics-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:16px;margin-top:16px}.graphics canvas{display:block;width:100%;max-width:512px;height:auto;aspect-ratio:4/3;margin:auto;background:#000;image-rendering:pixelated;cursor:crosshair}.game-controls{display:flex;gap:7px;justify-content:center;align-items:center;flex-wrap:wrap;padding:12px;background:#f4f7ef}.game-controls span{font:12px Consolas,monospace;margin-left:12px}.graphics-notes{padding:22px;font-size:13px;line-height:1.8}.graphics-notes h3{font-size:22px}.graphics-notes .hint{padding:12px 0}@media(max-width:650px){.graphics-grid{grid-template-columns:1fr}}