:root{color-scheme:light;--ink:#172e34;--muted:#5c6e70;--green:#d7f36b;--line:#dce2db}*{box-sizing:border-box}body{margin:0;background:#f5f6ef;color:var(--ink);font:16px/1.6 system-ui,sans-serif}aside{position:fixed;inset:0 auto 0 0;width:250px;background:#101e23;color:#e2e9e4;padding:36px 24px;display:flex;flex-direction:column}.brand{font-size:35px;font-weight:850;color:var(--green);text-decoration:none;letter-spacing:-2px}.brand span{font-size:18px;color:white;letter-spacing:-.5px}.eyebrow{font-size:11px;font-weight:750;letter-spacing:1.6px}aside .eyebrow{margin:40px 0 20px;color:#96abae}nav button{width:100%;text-align:left;padding:16px 12px;margin:4px 0;background:transparent;color:#c8d5d4;border:1px solid transparent}nav button.active{background:#24373b;border-color:#506447;color:var(--green)}.aside-bottom{margin-top:auto;color:#b9cac7;font-size:14px}.aside-bottom small{display:block;margin-top:12px;color:#8ba09f}main{margin-left:250px;padding:0 48px;max-width:1600px}header{display:flex;align-items:center;justify-content:space-between;padding:25px 0;border-bottom:1px solid var(--line);font-size:11px;letter-spacing:1px}button,select{font:inherit;cursor:pointer;border:1px solid #c8d2ca;border-radius:7px;background:transparent;color:inherit;padding:9px 15px}button:hover{background:#e6eddb}button:focus-visible,a:focus-visible,summary:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #639344;outline-offset:3px}button:disabled{opacity:.4;cursor:default}.intro{padding:35px 0 25px}.intro h1{font-size:clamp(35px,4vw,55px);line-height:1.15;letter-spacing:-2px;margin:14px 0 20px}.intro em{font-style:normal;color:#65833d}.intro>p:last-child{max-width:580px;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid var(--line);padding:22px 0;margin-bottom:32px}.stats div{padding-left:24px;border-left:1px solid var(--line)}.stats div:first-child{padding:0;border:0}.stats strong{display:block;font-size:23px;letter-spacing:-.5px}.stats span{font-size:12px;color:var(--muted)}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:28px}.exercise{background:white;border:1px solid var(--line);border-radius:14px;padding:28px}.exercise-top{display:flex;justify-content:space-between;align-items:center}.pill{background:#edf4dd;color:#486133;font-size:10px;padding:5px 9px;border-radius:4px;font-weight:700}h2{font-size:26px;letter-spacing:-.6px;line-height:1.25}#summary{color:var(--muted);font-size:14px}.tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);padding:15px 0;margin:16px 0 22px}.tabs button{font-size:13px;flex:1}.tabs button.active{background:var(--ink);color:white;border-color:var(--ink)}article{font-size:15px}article pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#101e23;color:#def2d7;padding:20px;border-radius:8px;font:13px/1.8 ui-monospace,monospace}article h3{font-size:19px}details{border-top:1px solid var(--line);padding:14px 0}summary{cursor:pointer;font-weight:650}details p{font-size:14px}label{display:block;font-weight:650;font-size:13px}.notes{margin:28px 0 18px}textarea{width:100%;resize:vertical;margin-top:8px;border:1px solid var(--line);border-radius:7px;padding:12px;font:14px/1.6 system-ui;background:#fafbf7;color:var(--ink)}.notes p{font-size:11px;color:var(--muted);margin:4px 0}select{margin-top:8px;width:100%;background:#f7f9f1}.pager{display:flex;justify-content:space-between;margin-top:25px}.roadmap{padding:8px 0}.roadmap h2{font-size:23px}.roadmap ol{list-style:none;counter-reset:step;padding:0}.roadmap li{counter-increment:step;position:relative;padding:0 0 27px 40px}.roadmap li:before{content:counter(step,decimal-leading-zero);position:absolute;left:0;top:0;color:#789449;font:14px ui-monospace,monospace}.roadmap b{display:block;font-size:13px}.roadmap span{font-size:11px;color:var(--muted)}.notice{background:#e8eedb;border-radius:10px;padding:20px;font-size:13px}.notice p{margin-bottom:0}.roadmap details{margin-top:20px;font-size:12px}.import input{max-width:100%;font-size:11px}footer{padding:35px 0;color:var(--muted);font-size:11px}#message:not(:empty){background:#fff0c4;padding:12px;margin-top:12px;border-radius:8px}@media(max-width:1100px){main{padding:0 25px}.workspace{grid-template-columns:1fr}.roadmap ol{display:grid;grid-template-columns:1fr 1fr}}@media(max-width:700px){aside{position:static;width:auto;padding:18px}.brand{font-size:28px}aside .eyebrow,.aside-bottom{display:none}nav{display:flex;gap:5px;margin-top:12px}nav button{font-size:11px;padding:8px}main{margin:0;padding:0 18px}header{font-size:9px;gap:10px}header button{font-size:11px;letter-spacing:0}.intro{padding-top:24px}.stats strong{font-size:17px}.stats div{padding-left:12px}.stats span{font-size:10px}.exercise{padding:18px}.tabs{gap:4px}.tabs button{padding:8px;font-size:12px}.roadmap ol{grid-template-columns:1fr}.intro h1{letter-spacing:-1.5px}}