@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;650;700&family=JetBrains+Mono:wght@400;500&display=swap');
.brand-owl{width:52px;height:52px;object-fit:cover;border-radius:16px}.brand-wordmark{display:block;width:148px;height:auto}.brand small{margin-top:3px}.brand{flex-shrink:0}
.illustrated-lesson{max-width:1100px!important;padding-top:28px!important}.lesson-hero{display:grid;grid-template-columns:1.1fr 1fr;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow)}.hero-copy{padding:30px}.hero-copy h1{font-size:clamp(2rem,3.3vw,2.75rem)}.hero-copy .intro{margin-bottom:0}.workshop-art{display:block;width:100%;height:100%;min-height:290px;object-fit:cover}.teaching-sequence{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px;margin:30px 0}.teaching-sequence .teach-point{margin:0;border-left:0;padding:0 0 0 18px;border-left:2px solid var(--line)}.teaching-sequence p{margin:0;font-size:16px}.owl-summary{width:96px!important;height:96px!important;background:none!important}.owl-summary img{border-radius:24px}.variable{animation:trace-value .22s ease-out}.code-line.active{transition:background .2s}.brand-owl{border:1px solid var(--line)}
@keyframes trace-value{from{opacity:.65;transform:translateY(4px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){.variable{animation:none}.code-line.active{transition:none}}
@media(max-width:700px){.lesson-hero{grid-template-columns:1fr}.hero-copy{padding:24px}.workshop-art{height:190px;min-height:0;object-fit:contain;background:#d7edfc}.teaching-sequence{grid-template-columns:1fr;gap:22px}.illustrated-lesson{padding-top:22px!important}}
@media(max-width:450px){.brand-owl{width:34px;height:38px;border-radius:10px}.brand-wordmark{width:100px}.brand small{font-size:14px!important;letter-spacing:.2px!important}.brand{gap:6px!important}.topbar{flex-wrap:wrap}.top-actions{margin-left:auto}.hero-copy{padding:20px}.workshop-art{height:165px}.hero-copy .intro{font-size:16px}}
:root{color-scheme:light;--bg:#f3f6fb;--panel:#fff;--ink:#172c49;--muted:#596b83;--line:#d6e0ee;--accent:#245ccd;--on:#fff;--soft:#e7effe;--code:#f8faff;--success:#166347;--success-bg:#e4f4ed;--warning:#87510b;--warning-bg:#fff2d8;--error:#a73136;--error-bg:#fdebed;--shadow:0 14px 36px #172c4908}
:root[data-theme=dark]{color-scheme:dark;--bg:#111827;--panel:#1b2535;--ink:#edf2fa;--muted:#aab8cc;--line:#35445a;--accent:#8ab4ff;--on:#102341;--soft:#253b60;--code:#151f2f;--success:#8cdeb4;--success-bg:#1e3b32;--warning:#f5cd82;--warning-bg:#403424;--error:#ffabb1;--error-bg:#422a33;--shadow:none}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 'DM Sans',system-ui,sans-serif}button,input,select,textarea{font:inherit}button,a,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}a{color:var(--accent)}button:focus-visible,a:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2rem,4vw,3rem);line-height:1.13;letter-spacing:-1.5px;margin-bottom:20px}h2{font-size:1.5rem;line-height:1.3;letter-spacing:-.5px}h3{font-size:1.05rem}p{margin-bottom:20px}.skip{position:absolute;top:-100px;left:15px;background:var(--panel);padding:12px;z-index:100}.skip:focus{top:10px}.topbar{padding:20px 4%;background:var(--panel);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-size:12px;font-weight:700;letter-spacing:1.7px}.brand small{display:block;font-size:21px;letter-spacing:-.8px;line-height:1.2}.brand-mark{background:var(--accent);color:var(--on);font:700 26px/46px monospace;border-radius:12px;width:46px;text-align:center}.top-actions{display:flex;align-items:center;gap:18px}#save-status{font-size:12px;color:var(--muted);max-width:210px}.theme-label{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:8px}select{background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:9px;min-height:44px;font-size:14px}.primary,.secondary,.quiet{border-radius:9px;padding:11px 18px;min-height:46px;font-size:14px;font-weight:650}.primary{background:var(--accent);color:var(--on);border:1px solid var(--accent)}.secondary{background:var(--panel);color:var(--ink);border:1px solid var(--line)}.quiet{background:transparent;border:0;color:var(--muted)}.focus{max-width:680px;margin:0 auto;padding:45px 25px 55px}.eyebrow{text-transform:uppercase;font-size:12px;letter-spacing:1.6px;font-weight:700;color:var(--accent);margin-bottom:14px}.intro{color:var(--muted);font-size:17px}.teaching-panel{background:var(--panel);border:1px solid var(--line);border-radius:16px;overflow:hidden;margin:25px 0;box-shadow:var(--shadow)}.file-label{display:block;padding:12px 19px;font-size:13px;color:var(--muted);border-bottom:1px solid var(--line)}pre,code{font-family:'JetBrains Mono',ui-monospace,monospace}pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.9;margin:0;padding:20px}code{font-size:.88em}.site-footer{border-top:1px solid var(--line);padding:20px 4%;display:flex;justify-content:space-between;gap:15px;font-size:12px;color:var(--muted)}dialog{width:min(720px,calc(100% - 30px));max-height:85vh;overflow:auto;border:1px solid var(--line);border-radius:18px;background:var(--panel);color:var(--ink);padding:24px}dialog::backdrop{background:#08162d88}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px}.dialog-head h2{margin:0}.path-item{display:flex;align-items:center;gap:15px;padding:15px 10px;width:100%;text-align:left;background:none;border:0;border-bottom:1px solid var(--line);color:var(--ink)}.path-item span{font-size:13px;color:var(--muted);display:block}.path-number{font:14px monospace;background:var(--soft);padding:8px;border-radius:8px}.lesson-chrome{max-width:1100px;margin:24px auto 0;padding:0 25px}.crumb{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px}.steps{display:flex;gap:6px;margin-top:16px}.step{flex:1;border:0;background:none;padding:0;color:var(--muted);font-size:12px;text-align:left;min-height:44px}.step:before{content:'';display:block;height:4px;background:var(--line);border-radius:5px;margin-bottom:7px}.step.current{color:var(--accent);font-weight:700}.step.current:before,.step.done:before{background:var(--accent)}.bottom-bar{border-top:1px solid var(--line);margin-top:28px;padding-top:20px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.answer-list{display:grid;gap:10px;margin:22px 0}.answer{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:10px;padding:15px 17px;text-align:left;display:flex;gap:13px;align-items:center;min-height:52px}.answer[aria-pressed=true]{border:2px solid var(--accent);padding:14px 16px;background:var(--soft)}.letter{font:12px monospace;color:var(--muted)}.feedback{background:var(--soft);border-radius:10px;padding:15px 18px;font-size:14px;margin:18px 0;white-space:pre-wrap}.feedback.success{background:var(--success-bg);color:var(--success)}.feedback.error{background:var(--error-bg);color:var(--error)}.hint{background:var(--warning-bg);color:var(--warning);padding:14px 17px;border-radius:9px;font-size:14px;margin:15px 0}.teach-point{padding-left:20px;border-left:3px solid var(--accent);margin:22px 0}.vocab{display:flex;flex-wrap:wrap;gap:8px}.vocab details{flex:1;background:var(--soft);border-radius:9px;padding:12px 15px;font-size:14px;min-width:190px}summary{cursor:pointer;font-weight:600}.canvas{max-width:1050px;margin:0 auto;padding:35px 25px}.trace-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:22px;margin:24px 0}.panel{background:var(--panel);border:1px solid var(--line);border-radius:15px;overflow:hidden}.panel-body{padding:22px}.trace-code{padding:16px 0}.code-line{padding:2px 20px;min-height:30px}.code-line.active{background:var(--soft);box-shadow:inset 3px 0 var(--accent)}.line-number{display:inline-block;width:28px;color:var(--muted);font-size:12px}.variables{display:flex;gap:12px;flex-wrap:wrap}.variable{background:var(--soft);padding:13px 16px;border-radius:10px;flex:1;min-width:100px;font-size:13px}.variable b{display:block;font:22px/1.7 'JetBrains Mono',monospace;color:var(--accent)}.trace-note{font-size:15px;margin:20px 0 0}.flow{display:flex;gap:12px;margin:20px 0;align-items:center;flex-wrap:wrap}.flow span{padding:10px 15px;background:var(--soft);border-radius:8px;font-size:14px}.workspace{max-width:1200px;display:grid;grid-template-columns:320px 1fr;margin:30px auto 45px;border:1px solid var(--line);border-radius:16px;background:var(--panel);overflow:hidden}.instructions{background:var(--bg);padding:28px;border-right:1px solid var(--line)}.instructions h1{font-size:27px;letter-spacing:-.8px}.instructions p{font-size:15px}.instructions details{font-size:14px}.editor-side{padding:23px;min-width:0}.editor-label{display:flex;justify-content:space-between;gap:10px;font-size:13px;color:var(--muted);margin-bottom:10px}.editor{width:100%;min-height:285px;background:var(--code);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:18px;font:14px/1.8 'JetBrains Mono',monospace;resize:vertical;tab-size:4}.run-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:14px 0}.output{background:var(--code);border:1px solid var(--line);border-radius:10px;min-height:100px;max-height:320px;overflow:auto}.output pre{font-size:13px}.output-title{font-size:13px;font-weight:700;margin-top:20px}.test-table{width:100%;border-collapse:collapse;font-size:14px}.test-table th,.test-table td{text-align:left;border-bottom:1px solid var(--line);padding:12px 10px}.test-table caption{text-align:left;padding:10px;font-weight:700}.explanation{width:100%;min-height:155px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--ink);padding:15px;font:16px/1.65 'DM Sans',sans-serif;resize:vertical}.checklist{padding:0;list-style:none}.checklist li{margin:9px 0;font-size:14px}.status-label{color:var(--success);font-size:13px}.small{font-size:13px;color:var(--muted)}.data-table{overflow:auto}.path-footer{margin-top:20px;display:flex;gap:10px;flex-wrap:wrap}.summary-icon{width:55px;height:55px;display:grid;place-items:center;background:var(--success-bg);color:var(--success);border-radius:50%;font-size:26px;margin-bottom:20px}.syntax-key{color:var(--accent)}[hidden]{display:none!important}
@media(prefers-reduced-motion:no-preference){.primary,.secondary,.answer{transition:background .15s,border-color .15s}.focus,.canvas,.workspace{animation:appear .18s ease-out}@keyframes appear{from{opacity:.5;transform:translateY(3px)}to{opacity:1;transform:translateY(0)}}}
@media(max-width:800px){.workspace{grid-template-columns:1fr;margin:25px 18px}.instructions{border-right:0;border-bottom:1px solid var(--line)}.trace-grid{grid-template-columns:1fr}.top-actions{gap:10px}#save-status{display:none}.theme-label{font-size:0}.theme-label select{font-size:14px}.site-footer{flex-direction:column;gap:3px}}@media(max-width:450px){.topbar{padding:15px;gap:10px}.brand{font-size:10px;letter-spacing:1px;gap:8px}.brand small{font-size:18px}.brand-mark{font-size:20px;width:36px;line-height:38px}.top-actions{gap:7px}.top-actions .secondary{padding:9px 10px}.theme-label select{max-width:90px;padding:9px 6px}.focus{padding:30px 20px}.lesson-chrome{padding:0 20px}.crumb{font-size:12px}.step{font-size:11px}.canvas{padding:28px 18px}.workspace{margin:22px 12px}.instructions,.editor-side{padding:20px}.editor{font-size:16px;min-height:280px}h1{letter-spacing:-.8px}.bottom-bar .primary{flex:1}.file-label{font-size:12px}.test-table{font-size:12px}.test-table td,.test-table th{padding:10px 6px}}