@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{--ink:#142c29;--muted:#61716b;--paper:#f5f5ee;--green:#d9ed78;--line:#dce0d5}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px 'DM Sans',sans-serif}header{height:88px;display:flex;align-items:center;justify-content:space-between;max-width:1160px;margin:auto;padding:0 30px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;font-size:13px;letter-spacing:1.8px;text-decoration:none;color:var(--ink)}.brand b{display:block;font-size:11px;letter-spacing:4px;margin-top:3px}.logo{background:var(--ink);color:var(--green);border-radius:12px;padding:8px 11px;font:30px 'Space Grotesk';letter-spacing:-4px}.logo span{color:white}button,input,select,textarea{font:inherit}button,a,input,select,summary{touch-action:manipulation}button{cursor:pointer;border:0;border-radius:9px;padding:13px 18px;background:var(--ink);color:white;font-weight:600}button:hover{filter:brightness(1.15)}button:disabled{opacity:.6;cursor:default}.outline{background:transparent;color:var(--ink);border:1px solid #bbc6bd}main{max-width:1100px;margin:0 auto;padding:36px 0 120px}h1,h2,h3{font-family:'Space Grotesk',sans-serif;font-weight:600}h1{font-size:clamp(36px,6vw,64px);line-height:1.05;letter-spacing:-2.6px;margin:16px 0 22px}h2{font-size:27px;letter-spacing:-.8px}h3{font-size:20px;margin:12px 0}p{line-height:1.65}.muted,small{color:var(--muted)}.eyebrow{font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase}.hero{display:grid;grid-template-columns:1.2fr 1fr;gap:55px;align-items:center;padding:28px 0 46px}.hero p{max-width:460px;color:var(--muted);font-size:17px}.pill{display:inline-block;background:#e5e9df;border-radius:20px;padding:7px 11px;font-size:12px}.hero button{background:var(--ink);padding:16px 24px}.terminal{background:var(--ink);color:#eff5e8;border-radius:18px;padding:24px;box-shadow:12px 14px 0 #e3e6d9;transform:rotate(1deg)}.terminal .eyebrow{color:#acbfb0;border-bottom:1px solid #38504a;padding-bottom:20px}.terminal code{display:block;font:20px/2 monospace;padding:23px 0}.terminal em{color:var(--green);font-style:normal}.terminal .translation{border-radius:8px;background:#2b423c;padding:15px;font-size:14px;line-height:1.6}.row{display:flex;align-items:center;justify-content:space-between;gap:14px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{padding:24px;background:#fff;border:1px solid var(--line);border-radius:13px}.card p{font-size:14px;color:var(--muted)}.card .num{font:13px monospace;color:var(--muted)}.card button{width:100%;text-align:left;background:#eef1e7;color:var(--ink);margin-top:12px}.card.feature{background:var(--green);border-color:var(--green)}.card.feature button{background:var(--ink);color:white}.section{margin-top:35px}.note{font-size:13px;line-height:1.6;border-left:3px solid #a4b881;padding:9px 15px;background:#eaf0df;margin:24px 0}.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:24px 0}input,select{border:1px solid #bec7bd;background:white;border-radius:8px;padding:13px;max-width:100%;color:var(--ink)}input{flex:1;min-width:170px}.chips{display:flex;gap:8px}.chips button{background:#e3e8dc;color:var(--ink)}.chips button.active{background:var(--ink);color:white}.codecard{display:flex;flex-direction:column}.codecard code{font:25px 'Space Grotesk';font-weight:700}.codecard p{flex:1}.tag{font-size:11px;color:#56665d;background:#eef1e8;border-radius:5px;padding:5px 8px}nav{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);display:flex;background:var(--ink);border-radius:16px;padding:7px;box-shadow:0 6px 30px #142c2933;z-index:5}nav a{min-width:116px;text-align:center;color:#bccdc2;padding:12px 18px;border-radius:10px;text-decoration:none;font-size:19px}nav a span{font-size:12px;margin-left:5px}nav a.active{background:var(--green);color:var(--ink)}dialog{border:0;border-radius:18px;padding:32px;max-width:640px;width:calc(100% - 28px);max-height:88vh;color:var(--ink);background:var(--paper)}dialog::backdrop{background:#09231bbb;backdrop-filter:blur(3px)}.close{float:right;background:#e2e7da;color:var(--ink);font-size:24px;padding:4px 13px}.codeblock{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--ink);color:var(--green);padding:20px;border-radius:10px;font:15px/1.8 monospace}.steps button{display:block;width:100%;margin:8px 0;background:white;color:var(--ink);border:1px solid var(--line);text-align:left;font:14px monospace}.steps button.active{background:var(--ink);color:var(--green)}.explanation{min-height:95px;padding:18px;background:#e5edcf;border-radius:10px;line-height:1.6}.split{display:grid;grid-template-columns:1fr 1fr;gap:24px}.quiz button{display:block;width:100%;margin:10px 0;text-align:left;background:white;color:var(--ink);border:1px solid var(--line)}progress{width:100%;accent-color:#55723a;height:9px}a{color:#315947}footer{font-size:12px;color:var(--muted);margin-top:32px;line-height:1.8}svg{width:100%;height:auto;display:block}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #8cae35;outline-offset:3px}.empty{text-align:center;padding:55px}.mobiletitle{max-width:760px}
@media(max-width:750px){header{height:74px;padding:0 20px}.brand{font-size:11px}header button{font-size:12px;padding:10px}main{padding:22px 20px 110px}.hero{grid-template-columns:1fr;gap:26px;padding-top:12px}.hero h1{max-width:340px}.hero p{font-size:15px}.terminal{transform:none;box-shadow:none}.terminal code{padding:12px 0;font-size:18px}.grid{grid-template-columns:1fr}.split{grid-template-columns:1fr}.row{flex-wrap:wrap}nav{bottom:0;border-radius:16px 16px 0 0;width:100%;justify-content:space-around;padding-bottom:calc(8px + env(safe-area-inset-bottom))}nav a{min-width:0;flex:1;padding:10px 5px}nav a span{display:block;margin:5px 0 0;font-size:11px}dialog{padding:23px}h2{font-size:24px}.section{margin-top:26px}}

.vargrid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin:18px 0}.vargrid>div{padding:10px;background:#e7eddc;border-radius:7px;font:13px monospace}.vargrid span{display:block;margin-top:7px;color:#42533f}.sandbox{padding:18px;border:1px solid var(--line);border-radius:12px}.sandbox label{display:block;margin:12px 0 7px}.sandbox input{width:100%;min-width:0}.lesson-source{font-size:13px}#looptrace,#calltrace{margin-top:20px}.toolbar button{flex-shrink:0}@media(max-width:420px){.vargrid{grid-template-columns:repeat(3,1fr)}.chips{flex-wrap:wrap}}

.cut-form{display:grid;gap:16px}.cut-form label{display:grid;gap:7px;font-size:14px}.cut-form input,.cut-form select{width:100%;min-width:0}.cut-form [hidden]{display:none}.cut-form p{font-size:12px;margin:0}details summary{cursor:pointer;font-weight:600}@media(max-width:750px){nav a span{font-size:10px}nav a{padding:10px 2px}}

.tool-link{display:inline-block;padding:12px 0;font-weight:700}.explain-row{margin:16px 0}.explain-row li{margin:8px 0;line-height:1.6}textarea{width:100%;max-width:100%;resize:vertical;padding:14px;border:1px solid #bec7bd;border-radius:8px;font:14px/1.6 monospace}.cut-form .checkline{display:flex;align-items:center}.cut-form .checkline input{width:auto;min-width:0;flex:none}#zero-dot,#target-dot,#length-tool,#length-holder,#drill-dot{transition:all .45s ease}@media(prefers-reduced-motion:reduce){#zero-dot,#target-dot,#length-tool,#length-holder,#drill-dot{transition:none}}

#tool,#travel{transition:all .45s ease}@media(prefers-reduced-motion:reduce){#tool,#travel{transition:none}}

.variable-watch{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.variable-watch div{padding:8px;background:#eef2e9;border-radius:8px;display:flex;flex-direction:column;gap:4px}.variable-watch b{font-size:15px}

[hidden]{display:none!important} #emailform,#codeform{display:grid;gap:14px} #email,#otp{width:100%;box-sizing:border-box} .member{padding:18px 0;border-bottom:1px solid #d6ded6;overflow-wrap:anywhere} header{gap:12px} #account{margin-left:auto}

#lesson-editor{display:grid;gap:12px;margin-top:20px} #lesson-editor input,#lesson-editor textarea,#lesson-select{width:100%;box-sizing:border-box} #lesson-editor textarea{font:inherit;padding:12px;border:1px solid #b9c8be;border-radius:8px} details{margin:12px 0} summary{cursor:pointer}