*{box-sizing:border-box}body{margin:0;background:#f6f5f0;color:#202b31;font:16px/1.65 system-ui,sans-serif}header,main{max-width:1360px;margin:auto;padding:22px 32px}header{display:flex;justify-content:space-between;gap:18px;border-bottom:1px solid #dedfd5}a{color:#256950}.brand{font-size:23px;font-weight:850;text-decoration:none;color:#202b31}.brand span{color:#368564}.hero{display:grid;grid-template-columns:1.15fr 1fr;gap:65px;align-items:center;padding:58px 0}.eyebrow{font-size:11px;letter-spacing:2px;font-weight:800;color:#59735f}h1{font-size:clamp(42px,5vw,68px);letter-spacing:-3px;line-height:1.1;margin:18px 0}h1 em{font-style:normal;color:#27758a}.lead{font-size:19px;max-width:560px}h2{font-size:30px;line-height:1.22;letter-spacing:-.7px}h3{font-size:21px}.hero-code{background:#202e2a;color:#eff5dd;border-radius:20px;box-shadow:12px 12px 0 #dce5c9;transform:rotate(1deg);padding:24px}.hero-code pre{font-size:19px;padding:20px 0;color:#f0d47a}.dots{color:#d0dc96;letter-spacing:4px;font-size:13px}.dots span{float:right;letter-spacing:0;color:#b9cbbb}.code-result{border-top:1px solid #506553;padding-top:15px;font-size:13px}.code-result b{display:block;color:#e8c979}.meta,.muted{font-size:12px;color:#68716a}button,.button{border:1px solid #24647c;background:#24647c;color:white;border-radius:7px;padding:12px 18px;font:inherit;font-size:14px;font-weight:700;cursor:pointer}button:hover{filter:brightness(.94)}button:disabled{opacity:.45;cursor:not-allowed}.secondary{background:#fff;color:#285841;border-color:#d0d9ca}.compact{padding:8px 12px;font-size:12px}.actions{display:flex;gap:9px;flex-wrap:wrap}.progress-strip{display:flex;align-items:center;gap:25px;padding:20px 25px;border-radius:12px;background:#e8ecdf}.progress-strip strong{font-size:23px;display:block}.progress-strip span{font-size:12px}.progress-strip progress{flex:1;min-width:60px;accent-color:#2a714d}nav{display:flex;gap:8px;flex-wrap:wrap;margin:27px 0}nav button{background:transparent;color:#526054;border:0}nav button[aria-pressed=true]{background:#244653;color:#fff}.studio-grid{display:grid;grid-template-columns:245px minmax(0,1fr);gap:24px}.sidebar{align-self:start;position:sticky;top:12px;background:#eeeee5;border-radius:12px;padding:16px}.sidebar label{font-size:12px}.sidebar #lesson-list{max-height:620px;overflow:auto}.lesson-link{background:transparent;color:#405346;display:block;border:0;text-align:left;width:100%;font-size:12px;font-weight:600;margin:3px 0;padding:10px}.lesson-link[aria-current=true]{background:#dce6ce;color:#20462e}.lesson-card,.editor-card{background:#fff;border:1px solid #dfe2d8;border-radius:14px;padding:26px;margin-bottom:20px;min-width:0}.challenge{border-left:4px solid #c6a441;background:#f8f3df;padding:16px 20px;margin:24px 0}.challenge span{font-size:10px;font-weight:800;letter-spacing:1px}.challenge p{margin:7px 0}label{display:block;font-weight:650;margin:12px 0}input,select,textarea{display:block;width:100%;padding:10px;border:1px solid #cdd5c8;border-radius:6px;background:#fff;color:#24382b;font:inherit;font-size:14px}textarea{resize:vertical}#editor{background:#1e2b27;color:#e5f4d9;min-height:250px;border:0;border-radius:0;font:15px/1.7 ui-monospace,monospace;tab-size:2;padding:22px}#editor:focus{outline:2px solid #b49f50;outline-offset:-2px}.editor-card{padding:0;overflow:hidden}.editor-top,.runbar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 20px;background:#eef1e9}.editor-top label{margin:0;font-size:12px}#draft-status{font-size:11px;color:#677269}.runbar{justify-content:flex-start;flex-wrap:wrap}.editor-card>p,.editor-card>details,.editor-card>#results{margin:16px 22px}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#edf1e7;padding:16px;border-radius:6px;font:13px/1.7 ui-monospace,monospace;max-height:400px;overflow:auto}summary{cursor:pointer;font-weight:650;font-size:14px}details{margin:18px 0}.result{padding:14px;border:1px solid #d4e1ce;border-radius:7px;margin:8px 0}.result.fail{border-color:#cf9d85;background:#fff5ef}.result strong{display:block}.result pre{margin:8px 0}#feedback{font-weight:700}#roadmap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.module-card{background:#fff;border:1px solid #dfe2d8;padding:25px;border-radius:12px}.two{display:grid;grid-template-columns:1fr 1fr;gap:24px}.trace-stats{display:flex;gap:16px;margin:25px 0}.trace-stats>div{background:#e8ecdf;padding:18px;flex:1;border-radius:9px}.trace-stats strong{display:block;font-size:35px}.trace-stats small{font-size:10px}footer{font-size:12px;color:#69796a;border-top:1px solid #dedfd5;padding:25px 0;margin-top:45px}[hidden]{display:none!important}:focus-visible{outline:3px solid #af8432;outline-offset:3px}@media(max-width:850px){.hero{gap:25px}.studio-grid{grid-template-columns:1fr}.sidebar{position:static}.sidebar #lesson-list{max-height:180px}.hero-code pre{font-size:15px}.two{grid-template-columns:1fr}}@media(max-width:600px){header,main{padding:18px}.hero{grid-template-columns:1fr;padding:30px 0}.hero-code{transform:none;margin-right:10px}.progress-strip{flex-wrap:wrap;padding:15px}.progress-strip progress{min-width:100px}#roadmap-grid{grid-template-columns:1fr}.lesson-card{padding:20px}h1{letter-spacing:-2px}.editor-top{align-items:flex-start;flex-direction:column}}

.hero-code pre{background:transparent;color:#f0d47a}.experiment{margin:18px 22px;border-top:1px solid #dfe2d8;padding-top:12px}

.preview-shell{background:#e3e9eb;padding:16px;overflow:auto;border-radius:12px;margin:18px 0}.preview-inner{margin:auto;background:white;width:100%;max-width:100%;min-height:420px}#preview{display:block;width:100%;height:460px;border:0;background:white}.edit-tabs{display:flex;gap:4px;padding:10px 18px;background:#eef1e9}.edit-tabs button{padding:7px 15px}.edit-tabs button[aria-selected=true]{background:#244653;color:white}#code{display:block;background:#172e39;color:#e1eff3;min-height:270px;border:0;border-radius:0;font:14px/1.7 ui-monospace,monospace;padding:20px;tab-size:2}.viewport-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.viewport-bar label{margin:0;font-size:12px}.viewport-bar select{width:auto}.preview-label{font-size:12px;color:#516974}.studio-grid{grid-template-columns:235px minmax(0,1fr)}.status-card{padding:15px;background:#eef4f6;border-radius:8px}.sample-window{background:#244653;border-radius:18px;padding:24px;color:white;box-shadow:12px 12px #d9e7e7}.sample-window .window-top{font-size:12px;color:#adcfd7}.sample-window .mini-hero{background:#edf5f5;color:#264954;padding:25px;border-radius:10px;margin-top:18px}.mini-hero strong{font-size:28px;display:block}.mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:12px}.mini-grid span{background:#fae8b3;color:#455248;padding:18px 8px;text-align:center;border-radius:6px;font-size:13px}.manual-list label{font-size:14px;display:flex;gap:10px;align-items:center}.manual-list input{width:18px}.editor-card .muted{padding:0 18px}.hero em{color:#27758a}.ref-links li{margin:14px 0}@media(max-width:850px){.studio-grid{grid-template-columns:1fr}}