*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button{font:inherit}.kalman-preview{height:190px;border-radius:20px;background:linear-gradient(145deg,#17122d,#5f4bea 62%,#68dcb5);position:relative;color:#fff;overflow:hidden}.kalman-preview:before,.kalman-preview:after{content:"";position:absolute;border:1px solid rgba(255,255,255,.25);border-radius:50%;transform:rotate(-18deg)}.kalman-preview:before{width:190px;height:76px;left:45px;top:67px}.kalman-preview:after{width:92px;height:38px;left:96px;top:86px}.kalman-preview strong{position:absolute;left:25px;bottom:16px;font:700 64px Georgia,serif}.kalman-preview i{position:absolute;right:23px;bottom:23px;width:42px;height:42px;border-radius:50%;background:#fff;color:#4f3bca;display:grid;place-items:center;font-style:normal;font-weight:800}.kalman-path{position:absolute;left:12%;right:14%;top:50%;height:3px;background:linear-gradient(90deg,#ff826f,#fff,#6ce1b8);transform:rotate(-12deg);box-shadow:22px -15px 0 -1px #fff,74px 8px 0 -1px #fff,135px -7px 0 -1px #fff}
.kalman-shell{min-height:100vh;background:#f6f3fb;color:#1d1930;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.kalman-nav{height:76px;padding:0 clamp(20px,5vw,74px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #ded8e9;font:700 11px ui-monospace,SFMono-Regular,monospace;letter-spacing:.12em}.kalman-nav button{border:0;background:transparent;color:#625c71;cursor:pointer}.kalman-hero{min-height:520px;padding:75px clamp(22px,8vw,120px) 65px;display:grid;grid-template-columns:1.2fr .8fr;align-items:center;overflow:hidden;background:radial-gradient(circle at 76% 48%,rgba(109,83,239,.14),transparent 30%),linear-gradient(135deg,#fbf9fd,#eee7fa)}.kalman-kicker,.results-panel span{font:700 10px ui-monospace,SFMono-Regular,monospace;letter-spacing:.18em;color:#6b54e7}.kalman-hero h1{font-size:clamp(70px,10vw,145px);line-height:.78;letter-spacing:-.075em;margin:26px 0 36px}.kalman-hero p{font-size:18px;color:#716b7e;max-width:480px}.estimate-art{width:min(32vw,380px);aspect-ratio:1;position:relative;margin:auto;border:1px solid rgba(91,71,201,.2);border-radius:50%;box-shadow:0 0 0 35px rgba(111,86,227,.04),0 0 0 70px rgba(111,86,227,.025)}.estimate-art:before,.estimate-art:after{content:"";position:absolute;left:8%;right:8%;top:50%;height:4px;border-radius:50%;transform:rotate(-16deg);background:#7460df}.estimate-art:after{height:2px;transform:rotate(17deg);background:repeating-linear-gradient(90deg,#ff7b6b 0 7px,transparent 7px 18px)}.estimate-art span,.estimate-art i{position:absolute;width:18px;height:18px;border:4px solid #fff;border-radius:50%;background:#6b52df;box-shadow:0 0 0 5px rgba(107,82,223,.16)}.estimate-art span{left:23%;top:58%}.estimate-art i{right:24%;top:35%}.estimate-art b{position:absolute;right:7%;bottom:7%;width:64px;height:64px;border-radius:50%;display:grid;place-items:center;background:#64d9af;color:#173c34;font-size:25px}
.quiz-layout{max-width:1280px;margin:0 auto;padding:90px clamp(18px,5vw,70px);display:grid;grid-template-columns:270px minmax(0,1fr);gap:40px}.level-rail{display:flex;flex-direction:column;gap:10px}.level-rail button{border:1px solid transparent;border-radius:16px;background:transparent;text-align:left;padding:17px 16px;display:grid;grid-template-columns:34px 1fr auto;align-items:center;gap:8px;color:#716b7e;cursor:pointer}.level-rail button.active{background:#fff;border-color:#e3ddec;box-shadow:0 12px 36px rgba(48,34,80,.07);color:#201a34}.level-rail button span,.level-rail button small{font:700 10px ui-monospace,monospace}.level-rail button b{font-size:13px}.quiz-card{background:#fff;border:1px solid #e3ddec;border-radius:28px;overflow:hidden;box-shadow:0 24px 80px rgba(52,36,88,.08)}.quiz-card-head{padding:36px 40px 28px;display:flex;justify-content:space-between;gap:30px;border-bottom:1px solid #eeeaf3}.quiz-card-head>div>span{font:700 9px ui-monospace,monospace;letter-spacing:.15em;color:#6b54e7}.quiz-card-head h2{font-size:32px;letter-spacing:-.04em;margin:9px 0 5px}.quiz-card-head p{margin:0;color:#777181}.score-orbit{width:82px;height:82px;flex:0 0 auto;border:1px solid #dad1ef;border-radius:50%;display:grid;place-content:center;text-align:center}.score-orbit b{font-size:25px;line-height:1}.score-orbit span{font-size:10px;color:#817a8d}.progress-row{padding:14px 40px;display:grid;grid-template-columns:auto 1fr auto;gap:14px;align-items:center;background:#faf8fc;font:700 9px ui-monospace,monospace;color:#827b8d}.progress-row>div{height:4px;background:#e5dfec;border-radius:4px;overflow:hidden}.progress-row i{display:block;height:100%;background:linear-gradient(90deg,#6b54e7,#64d9af)}.question-panel{padding:44px 40px 36px}.question-number{font:700 10px ui-monospace,monospace;color:#9c94a8}.question-panel h3{font-size:clamp(22px,3vw,34px);line-height:1.18;letter-spacing:-.035em;margin:14px 0 18px;max-width:760px}.question-panel pre{white-space:pre-wrap;margin:0 0 25px;padding:14px 16px;border-left:3px solid #6b54e7;background:#f5f1fb;color:#514966;font:13px/1.6 ui-monospace,SFMono-Regular,monospace}.option-list{display:grid;gap:10px}.option-list button{border:1px solid #e2dce9;border-radius:13px;background:#fff;color:#292337;padding:15px 17px;text-align:left;display:flex;align-items:flex-start;gap:13px;cursor:pointer;line-height:1.4}.option-list button:hover:not(:disabled){border-color:#6b54e7;background:#faf8ff}.option-list button span{width:25px;height:25px;flex:0 0 auto;border-radius:50%;display:grid;place-items:center;background:#eee9f5;font:700 10px ui-monospace,monospace}.option-list button.correct{border-color:#55c89f;background:#effbf6;color:#194b3b}.option-list button.correct span{background:#58d0a5;color:#123d30}.option-list button.wrong{border-color:#ee7c6c;background:#fff4f1;color:#66332c}.option-list button.wrong span{background:#f18a7a;color:white}.option-list button.muted{opacity:.45}.explanation{margin-top:18px;padding:18px 20px;border-radius:14px}.explanation.success{background:#eefaf5}.explanation.retry{background:#fff3f0}.explanation b{font-size:13px}.explanation p{margin:7px 0 9px;line-height:1.55;color:#554f60}.explanation small{font:700 9px ui-monospace,monospace;text-transform:uppercase;letter-spacing:.1em}.quiz-actions{display:flex;justify-content:space-between;padding:20px 40px 28px}.quiz-actions button{border:0;background:transparent;color:#6c6578;cursor:pointer;padding:12px 0}.quiz-actions button:disabled{opacity:.35;cursor:not-allowed}.quiz-actions .next{background:#241d3d;color:#fff;padding:13px 19px;border-radius:12px}.results-panel{max-width:1140px;margin:0 auto;padding:10px clamp(18px,5vw,70px) 110px;display:grid;grid-template-columns:.7fr 1.3fr;gap:20px}.results-panel>div{min-height:205px;padding:30px;border-radius:24px;background:#241d3d;color:#fff}.results-panel>div:last-child{background:#dff6ec;color:#173c34}.results-panel strong{display:block;font-size:70px;letter-spacing:-.06em;margin:15px 0}.results-panel strong i{font-size:20px;font-style:normal;color:#aba4bb}.results-panel h3{font-size:24px;margin:26px 0 12px}.results-panel p{color:inherit;opacity:.65}
@media(max-width:850px){.kalman-hero{grid-template-columns:1fr;min-height:600px}.estimate-art{display:none}.quiz-layout{grid-template-columns:1fr;padding-top:45px}.level-rail{display:grid;grid-template-columns:1fr 1fr}.level-rail button{grid-template-columns:25px 1fr auto}.results-panel{grid-template-columns:1fr}}
@media(max-width:600px){.kalman-nav{height:64px}.kalman-nav span{display:none}.kalman-hero{min-height:440px;padding-top:55px}.kalman-hero h1{font-size:70px}.kalman-hero p{font-size:15px}.level-rail{grid-template-columns:1fr}.quiz-layout{padding-left:12px;padding-right:12px}.quiz-card-head{padding:27px 22px 22px}.score-orbit{width:64px;height:64px}.progress-row{padding:13px 22px;grid-template-columns:1fr auto}.progress-row>div{grid-column:1/-1;grid-row:2}.question-panel{padding:32px 22px}.question-panel h3{font-size:24px}.quiz-actions{padding:16px 22px 24px}.results-panel{padding-bottom:60px}}