:root{--ink:#163b37;--muted:#546862;--paper:#f5f4ed;--line:#d3ddd4;--green:#176653;--mint:#e1f1e8;--gold:#f4d779}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 system-ui,-apple-system,sans-serif}a{color:var(--green);text-underline-offset:4px}button,input,select,textarea{font:inherit}button{cursor:pointer;background:var(--green);color:white;border:1px solid var(--green);padding:11px 17px;border-radius:7px;font-weight:650}button:hover{filter:brightness(.92)}button:disabled{opacity:.5;cursor:default}.quiet{background:transparent;color:var(--green);border-color:#b6c8bd}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #cd941f;outline-offset:3px}header{max-width:1340px;margin:auto;display:flex;justify-content:space-between;align-items:center;padding:24px 34px;border-bottom:1px solid var(--line);gap:20px}header a{text-decoration:none;font-size:14px}.brand{font-size:23px;font-weight:850;letter-spacing:-1px;color:var(--ink)}.brand span{color:var(--green)}main{max-width:1340px;margin:auto;padding:0 34px}.hero{display:grid;grid-template-columns:1.5fr 1fr;gap:70px;align-items:center;padding:64px 0 42px}.eyebrow,.mini-label{font-size:11px;font-weight:800;letter-spacing:1.8px;color:var(--green)}h1{font-size:clamp(40px,5.5vw,72px);letter-spacing:-3px;line-height:1.08;margin:20px 0}h1 em{font-style:normal;color:var(--green)}h2{font-size:32px;line-height:1.2;letter-spacing:-1px;margin:16px 0}h3{font-size:20px;line-height:1.35}p{margin:12px 0 18px}.lead{max-width:620px;color:var(--muted);font-size:19px}.meta,.small{font-size:13px;color:var(--muted)}.hero-card{background:var(--ink);color:#fff;padding:30px;border-radius:16px;transform:rotate(1deg);box-shadow:9px 9px 0 #e1e5d7}.hero-card .mini-label{color:var(--gold)}.flow{display:grid;gap:3px;border-left:1px solid #628b7f;margin:24px 0;padding-left:22px}.flow span{font-size:10px;color:#a5c9bc;letter-spacing:1.5px;margin-top:10px}.flow b{font-size:20px}.hero-card code{color:var(--gold);font-size:14px}.hero-card p{color:#bad3ca;font-size:13px;margin-bottom:0}.notice{background:#e8eee5;padding:16px 20px;border-radius:8px;font-size:13px}.notice b{display:block}.progress-bar{display:flex;gap:24px;align-items:center;padding:26px 0}.progress-bar strong{font-size:23px}.progress-bar span{font-size:13px;margin-left:6px}progress{height:8px;flex:1;accent-color:var(--green)}nav{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:30px;overflow:auto}nav button{border:0;border-bottom:3px solid transparent;white-space:nowrap;border-radius:0;background:transparent;color:var(--muted);font-size:14px;padding:16px}nav button.active{color:var(--green);border-bottom-color:var(--green)}.studio-grid{display:grid;grid-template-columns:270px minmax(0,1fr);gap:26px}aside{align-self:start;position:sticky;top:15px}label{display:block;font-size:13px;font-weight:650}input,select{display:block;width:100%;padding:10px;border:1px solid var(--line);background:white;border-radius:6px;color:var(--ink);margin:7px 0 15px}#lesson-list{max-height:640px;overflow:auto;padding-right:8px}.lesson-link{display:block;width:100%;text-align:left;font-size:13px;border:0;background:transparent;color:var(--muted);padding:11px 10px;margin:2px 0;line-height:1.5}.lesson-link.selected{background:var(--mint);color:var(--green);box-shadow:inset 3px 0 var(--green)}.chapter-label{font-size:11px;text-transform:uppercase;letter-spacing:1px;margin:20px 7px 8px;color:var(--muted)}article{background:#fff;border:1px solid var(--line);border-radius:11px;padding:27px;margin-bottom:20px;min-width:0}.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.pill{font-size:11px;background:var(--mint);color:var(--green);padding:4px 10px;border-radius:20px;white-space:nowrap}.tags{display:flex;flex-wrap:wrap;gap:6px}.tags code{font-size:11px;background:#f0f4ee;padding:4px 7px;border-radius:5px;overflow-wrap:anywhere}.mission{background:#f9f4df;border-left:3px solid var(--gold);padding:15px 18px;margin:22px 0}.mission p{margin:5px 0}.actions{display:flex;flex-wrap:wrap;gap:9px;margin:18px 0}.actions button{font-size:13px}details{margin:18px 0}summary{cursor:pointer;font-weight:650;font-size:14px}#choices{display:grid;gap:8px}#choices button{text-align:left;background:#f6f8f4;color:var(--ink);border:1px solid var(--line);font-size:14px}#choices button[aria-pressed=true]{border-color:var(--green);background:var(--mint)}textarea{width:100%;resize:vertical;border:1px solid var(--line);border-radius:6px;padding:14px;color:var(--ink);background:#fafbf8}#editor{min-height:285px;background:#153b35;color:#e1f2dd;border-color:#153b35;font:14px/1.8 ui-monospace,SFMono-Regular,monospace;tab-size:2;white-space:pre;overflow:auto}.editor-heading{display:flex;justify-content:space-between;gap:15px;margin-bottom:12px;font-size:11px;color:var(--muted)}pre{background:#f1f5ef;padding:16px;border-radius:6px;overflow:auto;font:12px/1.7 ui-monospace,SFMono-Regular,monospace;max-height:400px;max-width:100%}#feedback{padding:12px;background:var(--mint);border-radius:6px;font-size:14px}.table-wrap{overflow:auto;max-width:100%}table{width:100%;border-collapse:collapse;font-size:13px;text-align:left;margin:12px 0}td,th{padding:10px;border:1px solid var(--line);white-space:pre-wrap;min-width:50px;overflow-wrap:anywhere}th{background:#f0f4ee}td.selected{background:#d9ecda;border:2px solid var(--green)}.check-result{padding:10px 14px;margin:6px 0;border-radius:6px;background:#f0f4ee;font-size:13px}.check-result.fail{background:#fff1e8;color:#92380d}.two{display:grid;grid-template-columns:1fr 1fr;gap:20px}.range-controls{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.object-flow{display:flex;flex-wrap:wrap;gap:14px;padding:22px;background:var(--mint);border-radius:10px;margin:25px 0}.method-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.method-grid article{padding:20px;margin:0}.method-grid code{font-size:13px;overflow-wrap:anywhere}.method-grid p{font-size:13px}.method-grid button{font-size:12px}.reference-links{display:flex;flex-wrap:wrap;gap:20px}li{margin:8px 0}footer{border-top:1px solid var(--line);padding:32px 0;margin-top:40px;color:var(--muted);font-size:13px}[hidden]{display:none!important}@media(max-width:1000px){.hero{gap:30px}.studio-grid{grid-template-columns:220px minmax(0,1fr)}.method-grid{grid-template-columns:1fr 1fr}}@media(max-width:720px){header{padding:20px}.brand{font-size:20px}main{padding:0 18px}.hero{grid-template-columns:1fr;padding-top:30px;gap:24px}.hero-card{transform:none;padding:24px}.hero h1{letter-spacing:-2px}.flow{display:none}.hero-card code{display:block;margin-top:16px}.progress-bar{flex-wrap:wrap;gap:12px}.progress-bar progress{min-width:65px}.progress-bar .quiet{font-size:12px}.studio-grid{grid-template-columns:1fr}aside{position:static}#lesson-list{max-height:200px;border:1px solid var(--line);border-radius:6px}article{padding:19px}h2{font-size:27px}.two,.method-grid{grid-template-columns:1fr}.range-controls{grid-template-columns:1fr 1fr;gap:0 14px}.lesson-top{align-items:start}.editor-heading span{font-size:10px}nav button{padding:13px 10px}.lead{font-size:17px}.progress-bar span{display:block;margin:0}td,th{padding:8px}.object-flow{font-size:14px}#editor{font-size:12px}}