:root{--ink: #023047;--ink-2: #3d5a6c;--paper: #fffaf0;--card: #ffffff;--sun: #ffb703;--orange: #fb8500;--sky: #219ebc;--line: #ecdfc8;--radius: 18px;--shadow: 0 3px 0 rgba(2, 48, 71, .12), 0 10px 24px rgba(2, 48, 71, .06);font-family:Nunito,system-ui,sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background-image:radial-gradient(rgba(2,48,71,.07) 1px,transparent 1px);background-size:22px 22px}h1,h2,h3,.logo{font-family:"Baloo 2",Nunito,sans-serif;line-height:1.15}h1{font-size:clamp(1.9rem,4vw,2.8rem);margin:.2em 0 .3em}h2{font-size:1.5rem;margin:1.4em 0 .6em}a{color:var(--sky)}.muted,small{color:var(--ink-2)}.lead{font-size:1.15rem;max-width:62ch;color:var(--ink-2)}.top{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:10px clamp(12px,4vw,40px);background:#fffaf0eb;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);border-bottom:2px solid var(--line)}.logo{font-size:1.6rem;font-weight:800;text-decoration:none;color:var(--ink)}.logo span{color:var(--orange)}.nav{display:flex;flex-wrap:wrap;gap:4px}.nav a{text-decoration:none;color:var(--ink);font-weight:800;padding:7px 12px;border-radius:999px}.nav a:hover{background:#fff1d6}.nav a.on{background:var(--ink);color:#fff}#xp{background:var(--sun)}main{max-width:1120px;margin:0 auto;padding:18px clamp(14px,4vw,40px) 60px}.foot{text-align:center;padding:30px;color:var(--ink-2);font-size:.9rem}.btn{display:inline-flex;align-items:center;gap:6px;border:0;cursor:pointer;text-decoration:none;font:800 1rem Nunito,sans-serif;background:var(--orange);color:#fff;padding:10px 18px;border-radius:14px;box-shadow:0 4px #c56900;transition:transform .08s}.btn:active{transform:translateY(3px);box-shadow:0 1px #c56900}.btn.ghost{background:#fff;color:var(--ink);box-shadow:0 4px 0 var(--line);border:2px solid var(--line)}.btn.ghost.on{background:var(--sun)}.btn.big{font-size:1.1rem;padding:14px 22px}.btn.small{padding:6px 12px;font-size:.9rem}.sim-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:10px 0}.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:30px;align-items:center;padding:20px 0}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-weight:800;color:var(--orange);margin:0}.hl{background:linear-gradient(transparent 60%,var(--sun) 60%)}.hero-bot{display:grid;place-items:center;min-height:260px}.bot{position:relative;animation:bob 3s ease-in-out infinite}.bot-head{width:130px;height:100px;margin:0 auto;background:var(--sky);border-radius:26px;display:flex;justify-content:center;align-items:center;gap:22px;position:relative;box-shadow:inset 0 -8px #0000001f}.bot-head:before{content:"";position:absolute;top:-26px;width:6px;height:24px;background:var(--ink);border-radius:3px}.bot-head:after{content:"";position:absolute;top:-36px;width:16px;height:16px;background:var(--orange);border-radius:50%;animation:blink 1.4s infinite}.bot-head i{width:22px;height:22px;background:#fff;border-radius:50%;border:6px solid var(--ink);animation:look 4s infinite}.bot-body{width:180px;height:130px;margin:10px auto 0;background:var(--sun);border-radius:30px;display:grid;place-items:center;text-align:center;font:800 .8rem Nunito;letter-spacing:.05em;box-shadow:inset 0 -10px #0000001a}.bot-arm{position:absolute;top:130px;width:26px;height:100px;background:var(--orange);border-radius:14px;transform-origin:top center}.bot-arm.l{left:-26px;animation:wave 1.6s ease-in-out infinite}.bot-arm.r{right:-26px;transform:rotate(-12deg)}@keyframes bob{50%{transform:translateY(-10px)}}@keyframes wave{50%{transform:rotate(40deg)}}@keyframes blink{50%{opacity:.3}}@keyframes look{0%,40%{transform:translate(0)}50%,80%{transform:translate(5px)}}.path{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.level-step{display:flex;flex-direction:column;gap:4px;text-decoration:none;color:var(--ink);background:var(--card);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);border-top:8px solid var(--c)}.level-step:hover{transform:translateY(-2px)}.lv-num{font-size:2rem}.meter{height:10px;background:#f1ead9;border-radius:99px;overflow:hidden;margin-top:6px}.meter i{display:block;height:100%;background:var(--c);border-radius:99px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}.card{display:flex;gap:12px;align-items:center;position:relative;background:var(--card);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow);text-decoration:none;color:var(--ink);flex-wrap:wrap}a.card:hover{transform:translateY(-2px)}.card small{display:block}.lesson-card{border-left:8px solid var(--c);flex-wrap:nowrap}.lesson-card.done{background:#f3fbf5}.card-body{display:flex;flex-direction:column;gap:2px}.big-emoji{font-size:2.1rem;line-height:1}.tick{position:absolute;right:12px;top:10px;background:#2a9d8f;color:#fff;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-weight:800}.tracks .card{flex-direction:column;align-items:flex-start}.tracks .big-emoji{font-size:2.6rem}.split{display:grid;grid-template-columns:1fr 1fr;gap:30px}.two{display:grid;grid-template-columns:1.6fr 1fr;gap:26px}.crumb{display:inline-block;font-weight:800;text-decoration:none;margin:6px 0}.lesson header{display:flex;align-items:center;gap:18px}.lesson-emoji{font-size:4rem;background:#fff;border-radius:24px;padding:8px 14px;box-shadow:var(--shadow);border-bottom:6px solid var(--c)}.callout{background:#fff;border-radius:var(--radius);padding:14px 18px;margin:14px 0;box-shadow:var(--shadow);border-left:8px solid var(--c, var(--sky))}.callout p{margin:6px 0 0;font-size:1.08rem}.big-idea{background:#fff8e6;font-size:1.1rem}.analogy{--c: var(--sky)}.safety{--c: #e63946;background:#fff4f4}.think{--c: #8e44ad;background:#f8f1ff}.think textarea,.notebook{width:100%;min-height:90px;margin-top:10px;padding:12px;border-radius:12px;border:2px dashed #c9b3e6;font:1rem Nunito;background:#fff;resize:vertical}.notebook{min-height:160px;border-color:var(--line)}.steps{padding-left:1.3em}.steps li{margin:0 0 10px;padding-left:4px;line-height:1.5;font-size:1.05rem}.steps li::marker{font-weight:800;color:var(--orange)}.materials{padding-left:1.1em}.materials li{margin-bottom:4px}.deeper{background:#eef7fa;border-radius:var(--radius);padding:12px 18px;margin:14px 0}.deeper summary{font-weight:800;cursor:pointer}.quiz{background:#fff;border-radius:var(--radius);padding:6px 18px 14px;box-shadow:var(--shadow)}.options{display:flex;flex-wrap:wrap;gap:10px}.opt{font:700 1rem Nunito;padding:10px 16px;border-radius:12px;border:2px solid var(--line);background:#fffaf0;cursor:pointer}.opt.right{background:#d8f3dc;border-color:#2a9d8f}.opt.wrong{background:#ffe3e3;border-color:#e63946}.quiz-msg{font-weight:800;min-height:1.4em}.lesson-foot{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-top:24px}.level-head{border-left:10px solid var(--c);padding-left:18px}.goal{font-weight:800;font-size:1.1rem}.level-block h2 a{color:var(--ink);text-decoration:none;border-bottom:4px solid var(--c)}.timeline{list-style:none;padding:0 0 0 26px;border-left:4px dashed var(--line)}.timeline li{position:relative;margin-bottom:12px}.timeline li:before{content:"";position:absolute;left:-38px;top:22px;width:18px;height:18px;border-radius:50%;background:var(--c);border:3px solid var(--paper)}.sim{display:grid;grid-template-columns:auto 1fr;gap:18px;background:#fff;border-radius:var(--radius);padding:16px;box-shadow:var(--shadow);align-items:start}.sim canvas{max-width:100%;height:auto;background:#f7fbfd;border-radius:14px;border:2px solid #d9edf3;display:block}.sim-controls label{display:block;font-weight:800;margin-bottom:10px}.sim-controls label b{color:var(--orange)}.sim-controls input[type=range]{width:100%;accent-color:var(--orange)}.sim-controls .check{font-weight:700}.sim-readout{font-family:ui-monospace,monospace;font-size:.9rem;background:#023047;color:#8ee3f5;padding:8px 10px;border-radius:10px}.sim-score{font-weight:800}.codebot select{font:700 .95rem Nunito;padding:4px 8px;border-radius:8px}.palette{display:flex;flex-wrap:wrap;gap:8px}.blk{font:800 .92rem Nunito;border:0;border-radius:10px;padding:8px 12px;color:#fff;cursor:pointer;box-shadow:0 3px #0000002e}.b-f{background:#219ebc}.b-l{background:#8e44ad}.b-r{background:#e76f51}.b-loop{background:#2a9d8f}.program{display:flex;flex-wrap:wrap;gap:6px;padding:10px;min-height:52px;list-style:none;background:#f7f3ea;border-radius:12px;margin:0}.program li{cursor:default}.program li.active{outline:4px solid var(--sun)}.program .empty{color:var(--ink-2);font-style:italic}.hint{font-weight:800;margin:8px 0 6px}.news{display:flex;gap:14px;background:#fff;border-radius:var(--radius);padding:14px 16px;margin-bottom:12px;box-shadow:var(--shadow);border-left:8px solid var(--c)}.news h3{margin:2px 0 4px}.news p{margin:4px 0}.news .why{font-weight:700;color:var(--ink)}.tag{text-transform:uppercase;letter-spacing:.06em;font-weight:800;font-size:.75rem}.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}.chip{font:800 .9rem Nunito;border:2px solid var(--line);background:#fff;padding:6px 14px;border-radius:999px;cursor:pointer}.chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}.challenge{background:linear-gradient(135deg,#fff1d6,#ffe0f0);border-radius:var(--radius);padding:16px 18px;font-size:1.15rem;box-shadow:var(--shadow);margin-bottom:12px}.loop{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;list-style:none;padding:0;counter-reset:s}.loop li{background:#fff;border-radius:14px;padding:10px;box-shadow:var(--shadow)}.loop li b,.loop li small{display:block}.designer{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}.designer fieldset{border:2px solid var(--line);border-radius:14px;background:#fff}.designer legend{font-weight:800;padding:0 6px}.pick{display:block;margin:4px 0;cursor:pointer}.pick input{accent-color:var(--orange)}.design-card{margin-top:16px}.bp{background:#023047;color:#e8f6fb;border-radius:var(--radius);padding:18px 22px;background-image:linear-gradient(rgba(142,227,245,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(142,227,245,.08) 1px,transparent 1px);background-size:20px 20px}.bp h3,.bp h4{color:var(--sun);margin:6px 0}.bp-emoji{font-size:2rem;letter-spacing:4px}.bp dl{display:grid;grid-template-columns:80px 1fr;gap:6px 12px}.bp dt{font-weight:800;color:#8ee3f5}.bp dd{margin:0}.stats{display:flex;flex-wrap:wrap;gap:14px;font-weight:800;color:var(--sun)}.badges .badge{background:#fff;border-radius:var(--radius);padding:16px;text-align:center;box-shadow:var(--shadow);filter:grayscale(1);opacity:.55}.badge.got{filter:none;opacity:1;border:3px solid var(--sun)}.badge span{font-size:2.6rem;display:block}.badge b,.badge small{display:block}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:var(--ink);color:#fff;font-weight:800;padding:12px 22px;border-radius:999px;box-shadow:var(--shadow);animation:pop .3s;z-index:99}@keyframes pop{0%{transform:translate(-50%,20px);opacity:0}}@media (max-width: 860px){.hero,.split,.two,.sim{grid-template-columns:1fr}.path,.loop{grid-template-columns:repeat(2,1fr)}.hero-bot{display:none}}@media (prefers-reduced-motion: reduce){*{animation:none!important}}