@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');
:root{--bg:#f7f8f2;--ink:#1c2b23;--muted:#758077;--line:#dde3d7;--lime:#c7ed8b;--green:#204b39;--paper:#fff;--mono:Consolas,'Courier New',monospace}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px 'DM Sans',sans-serif}button,input,textarea{font:inherit}button,a,label{ -webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0}button:disabled{cursor:wait;opacity:.55}a{color:inherit}button:focus-visible,a:focus-visible,label:focus-within{outline:3px solid #729d43;outline-offset:3px}.sidebar{position:fixed;inset:0 auto 0 0;width:240px;background:#111d17;color:#e6ebdf;padding:36px 23px;display:flex;flex-direction:column}.brand{text-decoration:none;font:600 23px 'Space Grotesk',sans-serif;letter-spacing:-1px;display:flex;align-items:center;gap:9px;margin-bottom:52px}.brand>span:last-child{color:var(--lime);margin-left:-9px}.brand-icon{font:700 23px var(--mono);color:#14231a;background:var(--lime);border-radius:10px;padding:4px 6px;letter-spacing:-5px;width:36px}.brand-icon span{position:relative;top:5px}.eyebrow{font-size:10px;letter-spacing:1.8px;font-weight:700;color:var(--muted)}.sidebar .eyebrow{color:#7c8c80;margin:0 12px 17px}nav{display:grid;gap:8px}nav button{text-align:left;color:#a8b5aa;background:none;border-radius:9px;padding:14px 13px;display:flex;gap:13px;align-items:center;font-size:18px}nav button span{font-size:14px}nav button.active{background:#28392a;color:var(--lime)}nav button:hover{background:#253428}.sidebar-bottom{margin-top:auto;padding:27px 12px 0}.sidebar-bottom strong{font-size:13px}.sidebar-bottom p{font-size:12px;color:#8e9e91;line-height:1.8}.mentor-orb{font-size:30px;color:var(--lime);margin-bottom:12px}.quiet{background:none;color:inherit;font-size:12px;padding:7px 0}.import-label{display:block;cursor:pointer;font-size:12px;padding:7px 0}.local-note{font-size:10px!important}.shell{margin-left:240px}header{height:88px;border-bottom:1px solid var(--line);padding:0 48px;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--muted)}.header-stats{display:flex;align-items:center;gap:26px;color:#53604f}.header-stats b{color:var(--ink)}.avatar{background:#e3e9d8;border:1px solid #cfd7c4;border-radius:50%;display:grid;place-items:center;width:34px;height:34px;font-weight:700}main{max-width:1400px;margin:auto;padding:43px 48px 24px}h1,h2,h3,h4{font-family:'Space Grotesk',sans-serif;letter-spacing:-.8px}h1{font-size:36px;line-height:1.15;margin:12px 0}h2{font-size:24px;margin:0 0 10px}h3{font-size:18px;margin:0 0 6px}p{line-height:1.65} .sub{color:var(--muted);margin:0}.page-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:29px}.tag{display:inline-flex;align-items:center;gap:7px;font-size:11px;border:1px solid var(--line);border-radius:30px;padding:8px 13px;background:#fff}.dot{width:6px;height:6px;background:#81a957;border-radius:50%}.hero{background:#e9efd9;border:1px solid #d9e2c9;border-radius:17px;display:grid;grid-template-columns:1fr 245px;overflow:hidden;position:relative;padding:32px 35px;margin-bottom:27px}.hero .eyebrow{color:#587348}.hero h2{font-size:29px;max-width:490px;margin-top:12px}.hero p{font-size:13px;color:#667357;max-width:460px;margin:12px 0 22px}.primary{background:var(--green);color:#fff;padding:13px 21px;border-radius:8px;font-size:13px;font-weight:600}.primary:hover{background:#316449}.secondary{background:white;border:1px solid var(--line);color:var(--ink);padding:11px 17px;border-radius:8px;font-size:12px}.small-meta{font-size:11px;color:var(--muted);margin-left:15px}.snake-scene{display:flex;align-items:center;justify-content:center;position:relative;min-height:180px}.snake-scene:before{content:'';position:absolute;width:190px;height:190px;border-radius:50%;border:1px dashed #bccca4}.snake-scene:after{content:'print("let’s go!")';position:absolute;bottom:4px;font:11px var(--mono);color:#687951;background:#f6f8ec;padding:8px 13px;border-radius:8px;transform:rotate(-5deg)}.snake{width:152px;height:145px;filter:drop-shadow(0 12px 0 #ccd8b4)}.float-star{position:absolute;top:10px;right:15px;color:#7d9c47;font-size:28px}.stats-row{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-bottom:37px}.stat{border:1px solid var(--line);border-radius:12px;background:#fff;padding:19px;display:flex;gap:14px;align-items:center}.stat-icon{background:#f0f3e8;color:#668347;border-radius:10px;width:43px;height:43px;display:grid;place-items:center;font-size:20px}.stat strong{font:600 21px 'Space Grotesk',sans-serif}.stat p{font-size:11px;color:var(--muted);margin:4px 0 0}.section-top{display:flex;justify-content:space-between;align-items:center;margin:0 0 18px}.section-top p{font-size:12px;margin:5px 0 0;color:var(--muted)}.section-top h2{font-size:21px;margin:0}.bar{width:140px;height:5px;background:#e3e8db;border-radius:5px;overflow:hidden}.bar i{display:block;height:100%;background:#8fb35b}.progress-label{font-size:10px;color:var(--muted);text-align:right;margin-bottom:8px}.chapter{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:14px;overflow:hidden}.chapter-head{width:100%;padding:22px;display:flex;align-items:center;gap:16px;text-align:left;color:var(--ink);background:#fff}.chapter-number{width:44px;height:44px;display:grid;place-items:center;background:#f0f4e8;border:1px solid #dfe7d4;border-radius:11px;font:500 19px 'Space Grotesk',sans-serif}.chapter-head h3{font-size:16px}.chapter-head p{font-size:12px;color:var(--muted);margin:0}.chapter-status{margin-left:auto;display:flex;align-items:center;gap:16px;font-size:11px;color:var(--muted)}.pill{background:#edf4e4;color:#668249;padding:6px 10px;border-radius:6px;font-size:10px}.lesson-list{border-top:1px solid var(--line);padding:6px 22px 12px 82px}.lesson-row{display:flex;align-items:center;gap:12px;width:100%;padding:13px 0;background:none;text-align:left;border-bottom:1px solid #f0f2eb;color:var(--ink);font-size:13px}.lesson-row:last-child{border:0}.lesson-row:hover{color:#63863f}.lesson-row .circle{border:1px solid #d7dfcc;width:24px;height:24px;display:grid;place-items:center;border-radius:50%;font-size:10px}.lesson-row.done .circle{background:#d9edbf;border-color:#d9edbf}.lesson-row em{margin-left:auto;color:var(--muted);font-size:10px;font-style:normal}.bottom-banner{margin-top:26px;display:flex;gap:16px;border:1px dashed #cbd6bc;border-radius:12px;padding:22px}.bottom-banner p{margin:4px 0 0;font-size:12px;color:var(--muted)}footer{padding:25px 48px;font-size:10px;color:var(--muted);display:flex;justify-content:space-between}.lesson-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px}.back{background:none;color:var(--muted);font-size:12px;padding:8px 0}.workbench{display:grid;grid-template-columns:minmax(300px,.85fr) minmax(360px,1.15fr);gap:23px;align-items:start}.reading,.editor-panel,.guide-card{background:#fff;border:1px solid var(--line);border-radius:13px;overflow:hidden}.reading{padding:28px}.reading h1{font-size:28px;line-height:1.25}.reading p{font-size:14px;line-height:1.85}.java{background:#f0f3e9;border-left:3px solid #abc879;border-radius:0 8px 8px 0;padding:15px;margin:22px 0}.java b{font-size:11px;letter-spacing:.7px;text-transform:uppercase}.java pre{font:12px/1.8 var(--mono);white-space:pre-wrap;margin-bottom:0}.mission{border-top:1px solid var(--line);padding-top:23px}.mission .eyebrow{color:#678741}.mission p{font-weight:500}.details{margin-top:15px;border-top:1px solid var(--line);padding-top:15px}.details summary{cursor:pointer;font-size:12px;color:#64803f}.details p{font-size:12px}.details pre{font:12px/1.7 var(--mono);background:#f1f4eb;padding:12px;overflow:auto}.editor-head{display:flex;align-items:center;justify-content:space-between;background:#203126;color:#bdcbbf;padding:15px 19px;font:12px var(--mono)}.runtime{font:10px 'DM Sans',sans-serif;color:#bad991}.code-wrap{display:flex;background:#14231b;min-height:280px}.line-numbers{padding:20px 12px 20px 17px;color:#586d5e;font:13px/1.75 var(--mono);text-align:right;user-select:none;white-space:pre;overflow:hidden;width:45px;flex:none}.code{display:block;resize:vertical;width:100%;min-height:280px;max-height:700px;border:0;padding:20px 17px 20px 0;outline:none!important;background:#14231b;color:#e1efce;font:13px/1.75 var(--mono);tab-size:4;white-space:pre;overflow:auto;border-radius:0}.editor-tools{padding:13px 17px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;border-bottom:1px solid var(--line)}.editor-tools .primary{padding:10px 14px;background:#bedf8b;color:#24361f}.editor-tools .secondary{padding:9px 11px}.tool-link{background:none;color:var(--muted);font-size:11px;padding:7px}.input-area{padding:13px 18px;border-bottom:1px solid var(--line)}.input-area label{display:block;font-size:10px;color:var(--muted);margin-bottom:8px}.stdin{width:100%;background:#f7f9f2;border:1px solid var(--line);border-radius:6px;padding:8px;font:12px var(--mono);resize:vertical;min-height:55px}.console-head{padding:13px 18px;display:flex;justify-content:space-between;font-size:10px;letter-spacing:1px;color:var(--muted)}.console{padding:0 18px 18px;margin:0;font:12px/1.7 var(--mono);min-height:90px;max-height:300px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;color:#405b43}.console.error{color:#a64d38}.feedback{margin:0 16px 16px;border-radius:8px;background:#edf5e3;padding:15px;font-size:12px;line-height:1.7}.feedback.fail{background:#fff1e8;color:#904529}.feedback .primary{margin-top:12px}.note{font-size:11px;line-height:1.7;color:var(--muted);margin:15px 0}.badge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.badge{background:#fff;border:1px solid var(--line);border-radius:13px;padding:28px;text-align:center}.badge.locked{opacity:.5}.badge-symbol{font-size:36px;margin-bottom:16px;color:#75974e}.badge p{font-size:12px;color:var(--muted)}.guide-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}.guide-card{padding:24px}.guide-card p{font-size:13px}.guide-card pre{font:12px/1.8 var(--mono);white-space:pre-wrap;background:#f1f4eb;padding:15px;border-radius:7px}.guide-card a{color:#4d7336}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%) translateY(120px);background:#233e2c;color:#e3f4d1;padding:15px 24px;border-radius:10px;font-size:13px;z-index:50;box-shadow:0 8px 30px #0002;transition:transform .25s}#toast.show{transform:translateX(-50%) translateY(0)}.celebrate{animation:pop .4s ease}@keyframes pop{50%{transform:scale(1.03)}}.search{padding:11px 14px;border:1px solid var(--line);border-radius:8px;background:white;width:230px;font-size:12px}.no-results{color:var(--muted);padding:20px}.project-btn{margin-left:8px}
@media(min-width:1500px){main{padding-top:55px}.hero{padding:40px}.hero h2{font-size:34px}}@media(max-width:1100px){.sidebar{width:205px;padding:30px 16px}.shell{margin-left:205px}main{padding:30px 25px}header{padding:0 25px}.hero{grid-template-columns:1fr 175px;padding:25px}.workbench{grid-template-columns:1fr}.code{min-height:300px}.badge-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:720px){.sidebar{position:relative;width:100%;padding:18px 18px 10px}.brand{margin:0 0 18px;font-size:22px}.sidebar>.eyebrow,.sidebar-bottom{display:none}nav{display:flex;gap:4px;justify-content:space-between}nav button{padding:10px 8px;font-size:15px;gap:5px}nav button span{font-size:10px}.shell{margin-left:0}header{height:58px;padding:0 18px}header>#breadcrumb{display:none}.header-stats{width:100%;justify-content:space-between;gap:8px}main{padding:27px 18px}h1{font-size:28px}.page-top{align-items:start;gap:12px}.page-top>.tag{display:none}.hero{grid-template-columns:1fr;padding:25px}.hero h2{font-size:25px}.snake-scene{display:none}.small-meta{display:block;margin:12px 0 0}.stats-row{gap:8px}.stat{display:block;padding:13px}.stat-icon{width:30px;height:30px;font-size:16px;margin-bottom:10px}.stat strong{font-size:18px}.stat p{font-size:9px}.chapter-head{padding:17px;gap:12px}.chapter-head h3{font-size:14px}.chapter-head p{font-size:10px}.chapter-status .pill{display:none}.chapter-status{gap:8px}.lesson-list{padding-left:25px}.section-top{gap:10px}.search{width:150px}.bar{width:90px}.workbench{display:block}.reading{padding:23px;margin-bottom:20px}.editor-panel{width:100%}.badge-grid,.guide-grid{grid-template-columns:1fr}.lesson-top{gap:10px}.lesson-top .tag{font-size:9px}.code{font-size:12px}footer{padding:20px 18px;font-size:9px}.bottom-banner{padding:17px}.project-btn{margin:8px 0 0}}