:root{font-family:ui-rounded,"Trebuchet MS",system-ui,sans-serif;color:#202746;background:#f3f5fc;font-synthesis:none;--blue:#253a92;--purple:#6545bf;--muted:#626b84;--line:#dfe4f0;--yellow:#ffda65}
*{box-sizing:border-box}body{margin:0}a{color:inherit}button,a,input{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #b65a00;outline-offset:5px}button{min-height:48px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(2rem,4vw,3rem);letter-spacing:-.045em;line-height:1.12}h2{font-size:1.5rem;letter-spacing:-.025em}h3{font-size:1.12rem}p{line-height:1.6}a{text-decoration:none}.topbar{min-height:90px;max-width:1250px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:16px 40px;gap:20px}.brand{font-size:1.45rem;font-weight:900;display:flex;align-items:center;gap:10px;white-space:nowrap}.brand-icon{background:var(--blue);color:var(--yellow);border-radius:12px;width:42px;height:42px;display:grid;place-items:center;font-size:2rem}.grade{font-size:.68rem;letter-spacing:.1em;color:var(--muted);border-left:1px solid #c5ccde;padding-left:12px;margin-left:6px}nav{display:flex;gap:8px}nav a{padding:12px 16px;font-size:.9rem;font-weight:bold;border-radius:12px}nav a[aria-current="page"]{background:#e5e9fb;color:var(--blue)}main{max-width:1170px;margin:auto;padding:24px 0 40px;min-height:75vh}.intro{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;gap:20px}.eyebrow{font-size:.75rem;font-weight:900;letter-spacing:.13em;text-transform:uppercase;color:var(--purple);margin-bottom:12px}.intro h1{margin-bottom:10px}.intro p{color:var(--muted);margin:0}.pill{display:inline-flex;align-items:center;gap:7px;padding:10px 16px;border:1px solid var(--line);border-radius:30px;font-size:.88rem;font-weight:bold;background:#fff;white-space:nowrap}.hero{background:var(--blue);border-radius:24px;padding:30px 34px;color:white;display:grid;grid-template-columns:1fr 235px;gap:32px;margin-bottom:34px;position:relative;overflow:hidden}.hero .eyebrow{color:#cfdaff}.hero h2{font-size:1.8rem;margin-bottom:10px}.hero p{color:#e2e8ff;max-width:560px;font-size:1rem;margin-bottom:20px}.button{border:0;border-radius:12px;padding:14px 23px;background:var(--blue);color:white;font-weight:bold;display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;font-size:1rem}.button.yellow{background:var(--yellow);color:#29294a;box-shadow:0 4px 0 #c7a544}.button.secondary{background:white;color:var(--blue);border:1px solid #c8d0e5}.button:hover{filter:brightness(1.06);transform:translateY(-1px)}.orbit-progress{display:grid;place-items:center;align-content:center;gap:10px}.ring{width:146px;height:146px;display:grid;place-items:center;border-radius:50%;background:conic-gradient(var(--yellow) var(--pct),#5266b0 0);position:relative}.ring:before{content:"";position:absolute;inset:10px;background:var(--blue);border-radius:50%}.ring-inner{position:relative;text-align:center}.ring strong{font-size:2.8rem;display:block;line-height:1.1}.ring span{font-size:.8rem;color:#dde5ff}.orbit-progress>span{font-size:.8rem;color:#e2e8ff}.section-heading{display:flex;align-items:center;justify-content:space-between;margin:0 0 18px;gap:14px}.section-heading h2{margin:0}.section-heading p{color:var(--muted);font-size:.88rem;margin:0}.domains{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.domain-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px 20px;display:flex;flex-direction:column;align-items:start;text-align:left;transition:transform .15s,box-shadow .15s;min-width:0}.domain-card:hover{transform:translateY(-4px);box-shadow:0 12px 24px #253a9210}.domain-icon{font-family:system-ui;font-size:1.7rem;font-weight:800;width:55px;height:55px;border-radius:15px;display:grid;place-items:center;background:var(--tint);color:var(--accent);margin-bottom:20px}.domain-card h3{line-height:1.35;min-height:48px;margin-bottom:10px}.domain-card p{color:var(--muted);font-size:.88rem;min-height:44px;margin-bottom:20px}.domain-card .card-meta{margin-top:auto;width:100%;display:flex;justify-content:space-between;align-items:center;font-size:.8rem;color:var(--muted)}.mini-track{width:100%;height:6px;background:#eef0f7;border-radius:8px;margin:12px 0 16px;overflow:hidden}.mini-track>span{display:block;height:100%;background:var(--accent,var(--purple));border-radius:inherit}.card-link{font-size:.88rem;font-weight:800;color:var(--accent);display:flex;justify-content:space-between;width:100%}.bottom-note{margin-top:24px;display:flex;gap:12px;align-items:center;padding:18px 22px;background:#e9edf9;border-radius:14px;color:#4b5678;font-size:.9rem}.bottom-note strong{color:#293864}footer{max-width:1170px;margin:0 auto;padding:20px 0 28px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:.78rem;color:var(--muted)}.back{display:inline-flex;align-items:center;min-height:48px;color:var(--blue);font-size:.9rem;font-weight:bold;margin-bottom:12px}.topic-list{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.topic{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;gap:16px;align-items:center}.topic-number{font-weight:900;color:var(--accent);background:var(--tint);width:42px;height:42px;border-radius:12px;display:grid;place-items:center;flex-shrink:0}.topic-body{flex:1}.topic h3{margin:0 0 8px}.topic small{font-size:.8rem;color:var(--muted)}.stars{color:#856100;letter-spacing:3px}.stars .empty{color:#c8ccd9}.topic-actions{display:flex;gap:8px}.topic-actions a{font-size:.85rem;padding:10px 14px;min-height:46px}.learning{max-width:830px;margin:auto}.lesson-card,.quiz-card,.panel{background:white;border:1px solid var(--line);border-radius:22px;padding:32px}.lesson-card h1,.quiz-card h1{font-size:2rem}.lesson-card p{font-size:1.12rem}.example{background:#eff2fd;border-left:4px solid #6c62c7;border-radius:0 14px 14px 0;padding:22px;margin:24px 0}.example strong{display:block;font-size:.78rem;letter-spacing:.08em;color:var(--purple);margin-bottom:10px}.example p{margin:0}.remember{padding:16px 18px;background:#fff8da;border-radius:12px;font-size:1rem!important}.lesson-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.question-meta{display:flex;justify-content:space-between;font-size:.85rem;color:var(--muted);margin-bottom:14px}.quiz-card h1{line-height:1.4;margin:24px 0}.answers{display:grid;grid-template-columns:1fr 1fr;gap:12px}.answer{display:flex;align-items:center;gap:16px;padding:18px;border:2px solid #dfe4f1;border-radius:14px;background:white;text-align:left;font-weight:800;color:#202746;font-size:1.2rem;min-height:74px}.answer:not(:disabled):hover{background:#eff2ff;border-color:#7d87c7}.answer-label{font-size:.8rem;display:grid;place-items:center;border-radius:8px;background:#eef1f8;width:30px;height:30px;flex-shrink:0}.answer.correct{border-color:#16835d;background:#e8f7ef}.answer.wrong{border-color:#be4b40;background:#fff0ee}.answer:disabled{opacity:1}.feedback{margin-top:20px;padding:20px;background:#eef4ff;border-radius:14px;line-height:1.6}.feedback p{margin:6px 0 16px}.feedback h2{font-size:1.2rem;margin:0}.visual{margin:18px 0;padding:20px;background:#f4f6fc;border-radius:14px;overflow:auto}.equation{font-size:clamp(1.5rem,4vw,2.5rem);font-weight:900;text-align:center;letter-spacing:.04em;color:var(--blue);padding:12px}.fraction-bar{display:flex;max-width:330px;height:55px;border:2px solid var(--blue);margin:auto}.fraction-bar span{flex:1;border-right:1px solid var(--blue)}.fraction-bar span:last-child{border:0}.fraction-bar .filled{background:#8571dd}.fraction-caption{text-align:center;margin:10px 0 0;font-size:.9rem}.array{display:grid;justify-content:center;gap:9px}.array i{display:block;width:19px;height:19px;background:var(--purple);border-radius:50%}.data-table{border-collapse:collapse;width:100%;max-width:430px;margin:auto;font-size:1rem}.data-table th,.data-table td{border:1px solid #cdd4e7;padding:12px;text-align:left}.data-table th{background:#e7ebf9}.bars{max-width:440px;margin:auto}.bar-row{display:flex;align-items:center;gap:12px;margin:10px 0}.bar-row>span:first-child{width:65px;font-size:.9rem}.bar{background:#7660cc;border-radius:4px;height:24px}.shape-diagram{display:block;max-width:320px;height:160px;margin:auto}.result{text-align:center}.result h1{margin:15px 0}.big-stars{font-size:3.2rem;color:#a67500;letter-spacing:10px}.result .lesson-actions{justify-content:center}.progress-summary{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:24px 0}.stat{background:white;border:1px solid var(--line);border-radius:16px;padding:22px}.stat strong{display:block;font-size:2.2rem;color:var(--blue);margin-bottom:6px}.stat span{font-size:.85rem;color:var(--muted)}.review-row{border-top:1px solid var(--line);padding:16px 0}.review-row:last-child{padding-bottom:0}.review-row h3{font-size:1rem;margin-bottom:8px}.review-row p{margin:4px 0;font-size:.9rem}.guide{max-width:820px;margin:auto}.guide h2{margin-top:28px}.guide li{line-height:1.6;margin:10px 0}.guide a{text-decoration:underline;color:var(--blue)}.guide .button{text-decoration:none}.guide details{margin-top:24px;border-top:1px solid var(--line);padding-top:20px}.guide summary{cursor:pointer;font-weight:bold;min-height:44px}.danger{color:#a03631!important}.skip{position:absolute;left:12px;top:-100px;background:#fff;padding:14px;z-index:20}.skip:focus{top:12px}#storage-warning{position:fixed;bottom:0;left:0;right:0;background:#fff0c0;color:#533c00;padding:16px;text-align:center;z-index:30}svg text{font-family:inherit;fill:#253a92;font-size:17px}
@media(min-width:1400px){main{padding-top:38px}.hero{padding:36px 40px}.domain-card{padding:26px 24px}}
@media(max-width:1240px){main,footer{margin-left:32px;margin-right:32px}.topbar{padding-left:32px;padding-right:32px}.domains{gap:12px}.domain-card{padding:20px 16px}}
@media(max-width:950px){.domains{grid-template-columns:repeat(2,1fr)}.domain-card h3,.domain-card p{min-height:0}.topic-list{grid-template-columns:1fr}.grade{display:none}.topbar{padding:16px 24px}main,footer{margin-left:24px;margin-right:24px}.hero{grid-template-columns:1fr 170px;padding:26px;gap:16px}nav a{padding:12px 10px}.intro .pill{display:none}}
@media(max-width:600px){.topbar{align-items:start;flex-direction:column;gap:12px;padding:18px 20px 0}.brand{font-size:1.3rem}.brand-icon{width:35px;height:35px}.grade{display:block}nav{width:100%;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:10px}nav a{font-size:.82rem;padding:10px 12px}main{margin:0 18px;padding-top:24px}.intro{margin-bottom:20px}.intro h1{font-size:2rem}.intro p{font-size:.93rem}.hero{padding:24px;grid-template-columns:1fr}.hero h2{font-size:1.5rem}.orbit-progress{display:flex;justify-content:start;gap:16px}.ring{width:76px;height:76px}.ring:before{inset:6px}.ring strong{font-size:1.6rem}.ring span{font-size:.6rem}.hero .button{width:100%}.hero p{font-size:.9rem}.section-heading{align-items:start;flex-direction:column;gap:6px}.domains{gap:10px}.domain-card{padding:16px 14px}.domain-icon{width:44px;height:44px;font-size:1.4rem;margin-bottom:14px}.domain-card h3{font-size:1rem;min-height:43px}.domain-card p{font-size:.8rem;min-height:58px}.card-meta{font-size:.72rem!important}.card-link{font-size:.8rem}.bottom-note{font-size:.8rem;line-height:1.5;padding:16px}.topic{flex-wrap:wrap;padding:16px;gap:12px}.topic-actions{width:100%;padding-left:54px}.topic-actions a{flex:1}.lesson-card,.quiz-card,.panel{padding:22px 18px}.lesson-card h1,.quiz-card h1{font-size:1.5rem}.lesson-card p{font-size:1rem}.answers{grid-template-columns:1fr}.answer{padding:14px;min-height:62px}.progress-summary{gap:8px}.stat{padding:16px 10px}.stat strong{font-size:1.8rem}.stat span{font-size:.75rem}footer{margin:0 18px;flex-direction:column;gap:8px;font-size:.72rem}.lesson-actions .button{width:100%}.question-meta{font-size:.75rem}}
main:focus{outline:none}.feedback:focus{outline:2px solid #b9c7ee;outline-offset:3px}
body{padding-bottom:env(safe-area-inset-bottom)}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
