@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{--paper:#f6f3e9;--ink:#30283e;--muted:#827c89;--purple:#8060c0;--lime:#d4ed91;--line:#d9d4d9;--head-scale:1}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'DM Sans',Arial,sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer;color:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--purple);outline-offset:4px}button:disabled{cursor:default;opacity:.6}header{max-width:1400px;margin:auto;min-height:110px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 5%;border-bottom:1px solid var(--line)}.logo{display:flex;align-items:center;font-family:'Space Grotesk',sans-serif;font-size:26px;letter-spacing:-1.5px;font-weight:700;white-space:nowrap}.logo-icon{font-size:42px;color:var(--purple);margin-right:10px}.logo-dot{color:var(--purple)}.header-actions{display:flex;align-items:center;gap:25px;font-size:12px}.header-actions button{border:0;background:none;padding:8px 0}.header-actions a{font-weight:700}main{max-width:1400px;margin:auto;display:grid;grid-template-columns:1fr 1fr;min-height:700px}.math-panel{padding:54px 10% 35px}.eyebrow{display:flex;align-items:center;gap:7px;font-size:9px;font-weight:700;letter-spacing:1.7px;margin-bottom:25px}.status-dot{width:7px;height:7px;flex-shrink:0;border-radius:50%;background:var(--purple)}h1{font-family:'Space Grotesk',sans-serif;font-size:clamp(32px,3.4vw,49px);letter-spacing:-2.5px;line-height:1.12;margin:0 0 17px;font-weight:700}h1 span{color:var(--purple)}.intro{font-size:14px;line-height:1.7;color:var(--muted);margin:0 0 31px}.level-row{display:flex;gap:12px;align-items:center;font-size:11px;margin-bottom:10px}.level{background:#e9e1f4;color:#7050aa;border-radius:5px;padding:6px 9px;font-size:9px;font-weight:700;letter-spacing:1px}#skill{font-weight:600}#level-progress{color:var(--muted);margin-left:auto;font-size:10px}.level-track{background:#e5e0e5;height:3px;border-radius:5px;margin-bottom:31px}.level-track span{display:block;background:var(--purple);height:100%;border-radius:5px;transition:width .4s}form>label{display:block;letter-spacing:2px;font-size:9px;color:var(--muted);font-weight:700}.problem{font-family:'Space Grotesk',sans-serif;font-size:clamp(36px,4.2vw,60px);letter-spacing:-2px;line-height:1.25;font-weight:600;padding:15px 0 20px;overflow-wrap:anywhere}.problem span{color:#aba2b9}.answer-row{display:flex;border:2px solid var(--ink);border-radius:12px;padding:7px;gap:6px;background:#fffdf7;box-shadow:0 4px 0 #30283e0c}.answer-row:focus-within{border-color:var(--purple);box-shadow:0 0 0 4px #8060c010}.answer-row input{min-width:0;width:100%;padding:8px 12px;border:0;outline:none;background:transparent;font-family:'Space Grotesk',sans-serif;font-size:23px;color:var(--ink)}.answer-row input:focus-visible{outline:none}.answer-row input::placeholder{color:#b0a7b5;font-size:18px}.submit{width:51px;min-height:49px;background:var(--ink);color:white;border:0;border-radius:8px;font-size:26px;flex-shrink:0}.submit:hover{background:var(--purple)}.input-helper{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:12px;font-size:10px;color:var(--muted)}kbd{font:inherit;background:#eae5e8;padding:3px 5px;border-radius:3px;color:#665b72}.input-key{background:#eee8ee;border:1px solid #d8cfdf;border-radius:5px;padding:3px 10px;color:#6b597f}.feedback{display:flex;align-items:flex-start;gap:10px;padding:15px 0;min-height:92px;margin-top:12px}.feedback>span{display:grid;place-items:center;width:25px;height:25px;background:#eae3f3;color:var(--purple);border-radius:50%;flex-shrink:0;font-size:15px}.feedback strong{display:block;font-size:12px;margin:1px 0 5px}.feedback p{font-size:11px;line-height:1.6;color:var(--muted);margin:0}.feedback.correct>span{background:#deebbf;color:#4c6b2c}.feedback.wrong>span{background:#f4ded0;color:#9b6648}.rules{display:flex;gap:14px;flex-wrap:wrap;font-size:9px;color:#8e8495;border-top:1px solid #dfd8df;padding-top:16px}.brain-panel{border-left:1px solid var(--line);position:relative;background-color:#eee8f6;background-image:radial-gradient(#d2c6e0 .8px,transparent .8px);background-size:18px 18px;padding:27px 7% 30px;overflow:hidden}.specimen-label{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:8px;letter-spacing:1.4px;color:#91839f}.tiny-pill{font-size:7px;border:1px solid #d6c9e1;padding:7px 8px;border-radius:20px;white-space:nowrap}.character-stage{height:480px;position:relative;margin:0 -20px;isolation:isolate}.halo{position:absolute;left:50%;top:40px;transform:translateX(-50%);width:350px;height:350px;border:1px dashed #cbbbdd;border-radius:50%;background:radial-gradient(#f9f6fc88,#e5dbef33)}.floor-shadow{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);width:195px;height:24px;border-radius:50%;background:#53406b17;filter:blur(3px)}.body{position:absolute;left:50%;transform:translateX(-50%);height:180px;width:180px;bottom:15px}.head-wrap{position:absolute;width:112px;height:126px;left:50%;bottom:180px;transform:translateX(-50%) scale(var(--head-scale));transform-origin:50% 100%;transition:transform .48s cubic-bezier(.2,1.5,.4,1);z-index:2}.head-wrap svg{width:100%;height:100%;overflow:visible}.thinking{position:absolute;top:79px;right:10%;padding:10px 13px;background:#fcf9ef;border:1px solid #d6c9df;border-radius:12px 12px 12px 0;transform:rotate(5deg);font-size:10px;box-shadow:0 3px 0 #d9cde5;transition:opacity .3s;z-index:3}.doodle{position:absolute;font-family:'Space Grotesk',sans-serif;font-weight:700;line-height:1;color:#b1a0cd}.doodle-one{font-size:32px;left:14%;top:115px;transform:rotate(-14deg)}.doodle-two{font-size:35px;right:10%;top:265px;transform:rotate(10deg)}.doodle-three{font-size:24px;left:20%;bottom:90px;transform:rotate(-15deg)}.character-caption{position:absolute;bottom:0;left:0;width:100%;text-align:center;font-size:9px;color:#a094b0;letter-spacing:.2px}.pop-meter{margin-top:23px;padding:18px 20px;background:#faf7fdbd;border:1px solid #d9cce4;border-radius:13px}.pop-meter>div:first-child{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:10px}.pop-meter strong{font-size:9px;letter-spacing:1.7px}.pop-meter span{color:#8d7e9f}.pop-meter b{color:var(--purple);font-size:14px}.pop-track{margin-top:12px;height:11px;background:#e1d7ed;border-radius:10px;overflow:hidden}.pop-track>span{display:block;height:100%;background:var(--purple);border-radius:10px;transition:width .45s}.pop-meter p{margin:10px 0 0;font-size:9px;color:#9b8aaa}.stats{display:grid;grid-template-columns:1fr 1fr 1fr 1.6fr;max-width:1400px;margin:auto;padding:25px 5%;border-top:1px solid var(--line);gap:25px}.stats>div{border-right:1px solid var(--line)}.stats>div:last-child{border:0}.stats>div>span{display:block;font-size:8px;letter-spacing:1.5px;color:var(--muted);font-weight:700;margin-bottom:8px}.stats strong{font-family:'Space Grotesk',sans-serif;font-size:30px;font-weight:600}.stats strong small{font-family:'DM Sans',sans-serif;font-weight:400;color:#9b91a5;font-size:11px}.stats .save-note{padding-left:10px;align-self:center}.stats .save-note>span{letter-spacing:0;font-size:10px;color:#6e617e;font-weight:500}.save-note p{font-size:10px;color:#a095aa;margin:0;line-height:1.6}.pop-burst{position:absolute;inset:25px 0 auto;height:280px;display:flex;flex-direction:column;align-items:center;justify-content:center;opacity:0;pointer-events:none;z-index:5;background:#d4ed91;clip-path:polygon(50% 0,58% 18%,74% 7%,75% 29%,98% 26%,83% 45%,100% 57%,78% 65%,87% 88%,65% 83%,57% 100%,44% 84%,26% 98%,27% 74%,4% 80%,17% 59%,0 46%,23% 38%,15% 15%,38% 22%)}.pop-burst>span{font-family:'Space Grotesk',sans-serif;font-size:90px;font-weight:700;letter-spacing:-7px;transform:rotate(-8deg);text-shadow:4px 4px #fff8}.pop-burst small{font-size:9px;font-weight:700;letter-spacing:2px;transform:rotate(-8deg);margin-top:10px}.popping .head-wrap{animation:head-pop 2.7s both}.popping .pop-burst{animation:burst 2.7s both}.popping .thinking{opacity:0}.popping .body{animation:body-wiggle .4s 3}.confetti{position:absolute;left:50%;top:170px;width:8px;height:14px;opacity:0;z-index:4;pointer-events:none;animation:confetti-fall 2.4s var(--delay) ease-out both;background:var(--color);border-radius:2px}.confetti.symbol{width:auto;height:auto;background:none;color:var(--color);font-weight:700;font-size:23px}.is-wrong .head-wrap svg{animation:shake .32s}.is-correct .thinking{animation:thought-bounce .45s}.is-wrong .thinking{background:#f7e5d5}.is-correct .thinking{background:#e4f2c5}dialog{color:var(--ink);background:var(--paper);border:2px solid var(--ink);border-radius:18px;max-width:440px;width:calc(100% - 30px);padding:28px;box-shadow:7px 7px 0 #30283e33}dialog::backdrop{background:#30283e99;backdrop-filter:blur(4px)}dialog h2{font-family:'Space Grotesk',sans-serif;font-size:27px;margin:0 0 13px;letter-spacing:-1px}dialog p{font-size:14px;line-height:1.7;color:#81718a}dialog>div{display:flex;justify-content:flex-end;gap:10px;margin-top:22px}dialog button{border:1px solid #a69aac;background:#eee6f3;border-radius:9px;padding:11px 13px;font-size:12px}.danger{background:#30283e;color:white;border-color:#30283e}#confetti{position:absolute;inset:0;pointer-events:none;overflow:hidden;z-index:4}[hidden]{display:none!important}@keyframes head-pop{0%{transform:translateX(-50%) scale(2.2)}10%{transform:translateX(-50%) scale(2.4) rotate(-5deg)}17%,75%{transform:translateX(-50%) scale(0);opacity:0}100%{transform:translateX(-50%) scale(1);opacity:1}}@keyframes burst{0%,10%{opacity:0;transform:scale(.3)}20%,65%{opacity:1;transform:scale(1) rotate(-4deg)}90%,100%{opacity:0;transform:scale(1.15)}}@keyframes confetti-fall{0%{opacity:0;transform:translate(0,0)}12%{opacity:1}100%{opacity:0;transform:translate(var(--x),var(--y)) rotate(var(--spin))}}@keyframes body-wiggle{25%{transform:translateX(-50%) rotate(5deg)}75%{transform:translateX(-50%) rotate(-5deg)}}@keyframes shake{25%{transform:rotate(-5deg)}75%{transform:rotate(5deg)}}@keyframes thought-bounce{50%{transform:rotate(5deg) translateY(-5px)}}
@media(min-width:1500px){header{min-height:130px}main{min-height:770px}.math-panel{padding-top:65px}.character-stage{height:530px}.body{bottom:25px}.head-wrap{bottom:190px}.character-caption{bottom:8px}.halo{top:75px}.thinking{top:112px}}
@media(max-width:900px){header{padding:18px 5%;min-height:86px}.logo{font-size:23px}.header-actions{gap:14px;font-size:10px}.math-panel{padding:37px 8% 28px}.eyebrow{font-size:7px;letter-spacing:1px}h1{font-size:35px;letter-spacing:-1.8px}.intro{font-size:12px}.brain-panel{padding:23px 7%}.specimen-label{font-size:7px;letter-spacing:1px}.tiny-pill{display:none}.thinking{right:3%;font-size:8px}.character-stage{margin:0 -10px;height:475px}.halo{width:290px;height:290px;top:80px}.doodle-one{left:8%}.rules{font-size:8px;gap:8px}.stats{gap:15px;padding:20px 5%}.stats>div>span{font-size:7px;letter-spacing:1px}.stats .save-note{padding-left:0}}
@media(max-width:600px){header{min-height:76px;padding:13px 20px;gap:10px}.logo{font-size:20px;letter-spacing:-1px}.logo-icon{font-size:31px;margin-right:7px}.header-actions{gap:12px;font-size:9px}.header-actions a{display:none}main{grid-template-columns:1fr}.math-panel{padding:29px 25px 18px}.eyebrow{margin-bottom:16px;font-size:7px}h1{font-size:34px;margin-bottom:11px}.intro{font-size:12px;margin-bottom:20px;line-height:1.5}.intro br{display:none}.intro br:after{content:' '}.level-track{margin-bottom:20px}.problem{font-size:46px;padding:9px 0 13px}.answer-row{padding:5px}.answer-row input{padding:7px 11px;font-size:24px}.submit{min-height:46px;width:48px}.input-helper{font-size:9px}.feedback{min-height:73px;margin-top:5px;padding:12px 0}.feedback strong{font-size:11px}.feedback p{font-size:10px}.rules{padding-top:12px;font-size:8px;justify-content:space-between}.brain-panel{border-left:0;border-top:1px solid var(--line);padding:19px 25px 22px}.character-stage{height:390px;margin:-15px -10px 0}.body{height:155px;width:155px;bottom:15px}.head-wrap{width:90px;height:101px;bottom:158px}.halo{width:280px;height:280px;top:50px}.thinking{top:65px;right:5%;font-size:9px}.doodle-one{left:15%;top:115px}.doodle-two{top:245px;right:12%}.doodle-three{left:19%}.character-caption{font-size:8px}.pop-meter{margin-top:18px;padding:15px}.stats{grid-template-columns:repeat(3,1fr);gap:15px;padding:20px 25px}.stats>div:nth-child(3){border:0}.stats strong{font-size:25px}.stats strong small{font-size:9px}.stats .save-note{grid-column:1/-1;border-top:1px solid var(--line);padding-top:15px}.stats>div>span{font-size:7px}.pop-burst{inset:15px 0 auto;height:240px}.pop-burst>span{font-size:75px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}.popping .head-wrap{opacity:0}.popping .pop-burst{opacity:1;transform:scale(.9)}.popping .confetti{opacity:0}}