:root{--ink:#17382d;--muted:#596a60;--paper:#f6f6ef;--line:#dce3d9;--lime:#cdf369}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body.landing{overflow-x:clip;margin:0;background:var(--paper);color:var(--ink);font-family:'Plus Jakarta Sans',sans-serif;-webkit-font-smoothing:antialiased}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #197d59;outline-offset:5px}button{color:var(--ink)}.landing-skip{position:fixed;top:12px;left:20px;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;background:var(--ink);color:white;z-index:20}.landing-skip:focus{width:auto;height:auto;clip-path:none;padding:15px}.landing-header{max-width:1264px;margin:auto;padding:28px 48px;display:flex;align-items:center;justify-content:space-between;gap:24px}.hub-brand{display:flex;align-items:center;gap:11px;font-size:23px;font-weight:800;letter-spacing:-1px;white-space:nowrap}.hub-brand svg{width:37px;height:37px}.brand-light{font-weight:500}.landing-header nav{display:flex;align-items:center;gap:30px;font-size:13px;font-weight:700}.landing-header nav>a:not(.landing-button){min-height:44px;display:flex;align-items:center}.landing-button{display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:56px;border:1px solid var(--ink);border-radius:15px;padding:16px 22px;background:var(--ink);color:white;font-size:14px;font-weight:800;box-shadow:0 4px 0 #0a231a;transition:transform .18s,box-shadow .18s}.landing-button:hover{transform:translateY(-2px);box-shadow:0 6px 0 #0a231a}.landing-button:active{transform:translateY(3px);box-shadow:0 1px 0 #0a231a}.landing-button.compact{min-height:46px;padding:11px 18px;font-size:12px;gap:16px}.landing-button.lime{background:var(--lime);color:var(--ink);border-color:#a6c955;box-shadow:0 4px 0 #93b540}.landing-button.lime:hover{box-shadow:0 6px 0 #93b540}.landing-button span{font-size:22px;font-weight:500}.landing-hero{max-width:1264px;margin:auto;padding:68px 48px 92px;display:grid;grid-template-columns:1.1fr 1fr;gap:65px;align-items:center}.landing-eyebrow{display:flex;align-items:center;gap:8px;font-size:10px;letter-spacing:1.4px;font-weight:800;line-height:1.7}.landing-eyebrow>span{width:7px;height:7px;background:#197d59;border-radius:50%}.landing-hero h1{font-size:clamp(40px,4.6vw,65px);line-height:1.12;letter-spacing:-3.5px;font-weight:800;margin:24px 0}.landing em{font-style:normal;position:relative;z-index:0}.hero-message h1 em{background:linear-gradient(transparent 68%,#dbea9e 68%,#dbea9e 92%,transparent 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#ced9c4,0 26px 60px #17382d0a;border-radius:25px;padding:25px 26px;transform:rotate(2deg);transition:transform .25s}.sample-card:focus-within{transform:rotate(0)}.sample-heading{display:flex;align-items:center;justify-content:space-between}.sample-pill{padding:8px 12px;border-radius:20px;background:#f0ecfc;font-size:9px;font-weight:800;letter-spacing:.6px}.sample-spark{font-size:27px;color:#9c88d9}.sample-card h2{font-size:19px;letter-spacing:-.6px;margin:24px 0 9px;font-weight:800}.sample-card>p{font-size:13px;color:var(--muted);margin:0}.inline-math{font-family:'STIX Two Math',serif;font-size:18px}.sample-equation{padding:27px 10px;text-align:center;font-size:48px}.sample-options{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.sample-options button{padding:11px;min-height:46px;font-size:17px;font-weight:700;border:1px solid #dce3d9;border-radius:12px;background:#f8f9f4;box-shadow:0 3px 0 #e1e7da;transition:transform .15s,background .15s}.sample-options button:hover{background:#eff8dc;transform:translateY(-2px)}.sample-options button[aria-pressed=true]{background:var(--lime);border-color:#a7c56b;box-shadow:0 3px 0 #b4cd87}.sample-options button.needs-revisit{background:#fff0e8;border-color:#e7bca9}.sample-feedback{font-size:11px;line-height:1.6;min-height:49px;padding-top:18px}.sample-explain{background:none;border:0;min-height:40px;display:flex;align-items:center;justify-content:space-between;width:100%;font-size:11px;font-weight:800;border-top:1px solid #e9ede4;margin-top:8px;padding:12px 0}.sample-caption{display:block;color:var(--muted);font-size:9px;line-height:1.7}.sample-working{border-top:1px solid var(--line);margin:3px 0 13px;padding-top:5px;animation:step-in .24s ease-out}.sample-working[hidden]{display:none}.sample-working>div{display:flex;align-items:flex-start;gap:10px;margin:13px 0;font-size:11px;line-height:1.6}.sample-working>div>span{background:#efe9fb;flex:0 0 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#dfe6d6;border-radius:20px;position:relative;min-height:242px;transition:transform .2s,box-shadow .2s;background:#eaf0e3}.topic-card:hover{transform:translateY(-4px);box-shadow:0 7px 0 #17382d18}.topic-powers{background:#eee8fa;border-color:#e2d9f1}.topic-equations{background:#e2eef2;border-color:#d6e5ea}.topic-decimals{grid-column:span 3;background:#f3eddf}.topic-reasoning{grid-column:span 3;background:#f8e6dd}.topic-maths{white-space:nowrap;display:block;font-family:'STIX Two Math',serif;font-size:49px;margin-bottom:24px;line-height:1}.topic-maths>span{font-size:32px}.topic-maths sup{font-size:.55em;vertical-align:super}.topic-card h3{font-size:16px;font-weight:800;margin:0 0 9px;letter-spacing:-.4px}.topic-card p{font-size:11px;color:var(--muted);line-height:1.8;margin:0;max-width:245px}.topic-arrow{position:absolute;right:22px;top:22px;font-size:21px}.account-invite{max-width:1168px;border-radius:30px;padding:61px 75px;background:var(--ink);color:#fff;display:grid;grid-template-columns:.8fr 1fr;gap:70px;align-items:center}.account-invite .landing-eyebrow{color:#cde4b1}.account-invite h2{font-size:44px}.account-invite em{color:var(--lime)}.account-invite p{font-size:13px;color:#c7d4c8;line-height:1.9;max-width:365px}.invite-art{display:flex;align-items:center;justify-content:center;position:relative;height:235px}.invite-art>span{font-size:195px;color:var(--lime);line-height:1;transform:rotate(10deg);animation:gentle-rock 7s ease-in-out infinite}.invite-art i{position:absolute;width:58px;height:62px;border-radius:16px;background:#e1d7fa;font-size:24px;font-weight:700;font-style:normal;color:var(--ink);display:grid;place-items:center;box-shadow:0 5px 0 #ad9bcd;top:5px;left:10px;transform:rotate(-12deg)}.invite-art i:nth-of-type(2){top:75px;left:auto;right:5px;background:#f7c7b1;box-shadow:0 5px 0 #ce9c85;transform:rotate(12deg)}.invite-art 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auto 80px;padding:0 28px}.legal-page h1{font-size:40px;font-weight:800;letter-spacing:-1.5px;line-height:1.2;margin:20px 0}.legal-page h2{font-size:19px;font-weight:800;margin:30px 0 12px}.legal-page p{font-size:14px;line-height:1.9;color:var(--muted)}.legal-page a{text-decoration:underline;text-underline-offset:3px}@keyframes step-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}@keyframes gentle-rock{0%,100%{transform:rotate(10deg)}50%{transform:rotate(-5deg)}}@media(max-width:1050px){.landing-hero{gap:35px;padding-top:48px}.landing-header{padding:24px 32px}.landing-header nav{gap:20px}.landing-hero,.landing-section{padding-left:32px;padding-right:32px}.learning-strip,.account-invite,.landing-footer{margin-left:32px;margin-right:32px}.landing-hero h1{font-size:48px;letter-spacing:-2.5px}.hero-facts{gap:16px}.how-section{gap:50px}.account-invite{padding:45px;gap:40px}.landing-footer{flex-wrap:wrap}.sample-card{padding:22px}.sample-card h2{font-size:17px}.landing-actions{gap:15px}.hero-playground{padding-left:5px}}@media(max-width:760px){html{scroll-padding-top:25px}.landing-header{padding:20px 22px;gap:15px}.hub-brand{font-size:20px;gap:8px}.hub-brand svg{width:33px;height:33px}.landing-header nav{gap:15px}.landing-header nav .desktop-link,.landing-header nav .compact{display:none}.landing-header .sign-in-link{font-size:12px;white-space:nowrap}.landing-hero{padding:39px 24px 55px;display:block}.landing-hero h1{font-size:46px;letter-spacing:-2.5px;margin:20px 0}.hero-description{font-size:14px;max-width:480px}.landing-eyebrow{font-size:9px;letter-spacing:1.05px}.landing-actions{gap:19px;margin-top:25px}.landing-button{font-size:13px;padding:15px 19px;min-height:54px;gap:20px}.secondary-link{font-size:11px}.hero-facts{margin-top:28px;gap:27px}.hero-facts>span+span{padding-left:27px}.hero-playground{max-width:400px;margin:52px auto 0;padding:16px 6px 40px 8px}.sample-card{padding:23px}.sample-card h2{font-size:18px}.sample-equation{font-size:45px;padding:24px 10px}.floating-note{font-size:11px;top:-10px;right:4px}.orbit-mark{left:-9px;font-size:40px}.floating-chip{left:0;padding:13px 17px}.learning-strip{margin:0 24px;padding:24px 0;display:block;font-size:11px}.learning-strip>div{margin-top:18px;gap:13px;font-size:9px;justify-content:space-between}.landing-section{padding:59px 24px}.how-section{display:block}.landing-section h2{font-size:34px;letter-spacing:-1.5px}.section-intro>p{font-size:13px;max-width:100%}.learning-steps{margin-top:32px}.learning-steps li{gap:20px;padding-bottom:29px}.learning-steps h3{font-size:16px}.learning-steps p{font-size:12px}.skill-section{padding-top:0}.section-heading-row{display:block;margin-bottom:26px}.section-heading-row>p{font-size:13px;max-width:100%;margin-top:18px}.landing-topics{grid-template-columns:1fr;gap:14px}.topic-card,.topic-decimals,.topic-reasoning{grid-column:auto;min-height:155px;display:flex;gap:20px;align-items:center;padding:23px}.topic-maths{flex:0 0 73px;font-size:37px;margin:0}.topic-maths>span{font-size:22px}.topic-fractions .topic-maths{font-size:30px;letter-spacing:-1px}.topic-equations .topic-maths{font-size:27px}.topic-card h3{font-size:15px;max-width:210px;padding-right:12px}.topic-card p{font-size:11px}.topic-arrow{top:13px;right:14px;font-size:18px}.account-invite{margin:0 20px;padding:31px 26px 39px;border-radius:24px;display:block}.invite-art{width:220px;height:170px;margin:0 auto 32px}.invite-art>span{font-size:140px}.invite-art i{width:42px;height:45px;border-radius:12px;font-size:18px}.invite-art i:nth-of-type(2){top:55px}.account-invite h2{font-size:38px}.account-invite p{font-size:12px}.account-invite .landing-actions{gap:14px}.light-link{font-size:11px}.landing-faq{display:block}.landing-faq>div+div{margin-top:20px}.landing-faq h2{font-size:31px}.landing-footer{margin:0 24px;display:block;padding:27px 0}.landing-footer p{margin:18px 0 12px}.landing-footer nav{gap:23px}.legal-page{margin-top:30px}.legal-page h1{font-size:33px}}@media(max-width:359px){.landing-hero h1{font-size:39px}.landing-hero{padding-left:20px;padding-right:20px}.landing-actions{gap:12px}.landing-eyebrow{font-size:8px}.hero-facts{gap:16px}.hero-facts>span+span{padding-left:16px}.hero-playground{margin-top:50px}.sample-card{padding:19px}.sample-card h2{font-size:16px}.topic-card{padding:21px 17px;gap:13px}.topic-maths{flex-basis:63px;font-size:32px}.topic-card h3{font-size:14px}.learning-strip>div{gap:7px;font-size:8px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.sample-card{transform:none}.landing-button:hover,.topic-card:hover{transform:none}}

/* Clearer entry and topic destinations; the same light palette as practice. */
.landing-hero{padding-bottom:48px}
.landing-hero h1{font-size:clamp(40px,4.8vw,61px);line-height:1.08;letter-spacing:-2.5px}
.hero-description{max-width:460px;font-size:16px;line-height:1.8}
.hero-playground{padding-bottom:10px}
.hero-facts{margin-top:28px}
.landing-topics{grid-template-columns:repeat(3,minmax(0,1fr))}
.landing-topics .topic-card{grid-column:auto;min-height:220px}
.topic-units{background:#f7efd8}
.topic-units .topic-maths{font-size:40px}
.landing-header .sign-in-link,.landing-footer nav a,.secondary-link,.light-link{display:inline-flex;align-items:center;min-height:44px}
.companion-invite{width:190px;height:220px;justify-self:center}
.companion-invite svg{width:100%;height:100%;overflow:hidden;filter:drop-shadow(0 8px 6px #0d28132b)}
@media(max-width:760px){
 .landing-hero{padding-top:26px;padding-bottom:34px}
 .landing-hero h1{font-size:43px;letter-spacing:-2px;line-height:1.09}
 .hero-description{font-size:14px;line-height:1.75}
 .landing-actions{margin-top:22px}
 .hero-playground{margin-top:34px;padding-bottom:0}
 .landing-topics{grid-template-columns:1fr}
 .landing-topics .topic-card{min-height:130px;padding:22px}
 .companion-invite{width:112px;height:126px}
 .account-invite{padding-top:30px;padding-bottom:33px}
}
@media(max-width:360px){.landing-hero h1{font-size:37px}.hero-facts{gap:18px}.hero-facts>span+span{padding-left:18px}}
.landing-analytics-choice{display:flex;align-items:center;gap:12px;padding:18px 22px;margin:35px 0 20px;background:#f0f3e8;border:1px solid #dce3d9;border-radius:16px}.landing-analytics-choice>div{flex:1}.landing-analytics-choice strong{font-size:13px}.landing-analytics-choice p{font-size:11px;line-height:1.7;margin:5px 0 0;color:#58675e}.landing-analytics-choice button{font:600 12px system-ui;background:#fff;border:1px solid #d1dbcb;padding:12px;border-radius:9px;color:#17382d;cursor:pointer;white-space:nowrap}.landing-analytics-choice button:focus-visible{outline:3px solid #197d59;outline-offset:3px}@media(max-width:600px){.landing-analytics-choice{flex-wrap:wrap;padding:16px}.landing-analytics-choice>div{flex-basis:100%}}