:root{--orange:#f97316;--ink:#171717;--muted:#62625f;--line:#e5e5e0;--white:#fff;--max:1240px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:105px}body{margin:0;color:var(--ink);background:#fff;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;font-size:17px;line-height:1.6}body.modal-open{overflow:hidden}button,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button{cursor:pointer}a{color:inherit;text-decoration:none}a,button,summary{-webkit-touch-callout:default}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}img{max-width:100%;height:auto;display:block}h1,h2,h3,p{margin:0}h1,h2,h3{font-weight:650;line-height:1.08;letter-spacing:-.055em}button{color:inherit}button:disabled{cursor:default}.wrap{max-width:var(--max);width:calc(100% - 96px);margin-inline:auto}.skip{position:fixed;top:12px;left:12px;transform:translateY(-160%);background:var(--ink);color:#fff;padding:12px 22px;z-index:100;border-radius:28px}.skip:focus{transform:translateY(0)}.site-header{background:rgba(255,255,255,.96);border-bottom:1px solid rgba(0,0,0,.07);position:sticky;top:0;z-index:30;backdrop-filter:blur(16px)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:30px;min-height:92px}.brand{font-weight:750;font-size:33px;letter-spacing:-1.3px;line-height:1;display:inline-flex;align-items:center;gap:11px;flex-shrink:0}.brand-icon{width:44px;height:44px;border-radius:10px;flex-shrink:0}.desktop-nav{display:flex;align-items:center;gap:29px;font-size:14px;font-weight:550}.desktop-nav a:hover,.footer-links a:hover{color:#ad4100}.header-actions{display:flex;align-items:center;gap:22px}.language{position:relative}.language summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:7px;font-size:13px;font-weight:600;min-height:44px}.language summary::-webkit-details-marker{display:none}.language-menu{position:absolute;top:44px;right:0;min-width:164px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:8px;box-shadow:0 14px 40px #0000000d;z-index:5}.language-menu a{display:flex;align-items:center;justify-content:space-between;min-height:44px;padding:8px 12px;font-size:14px;border-radius:10px}.language-menu a[aria-current]{font-weight:650}.language-menu a[aria-current]::after{content:'✓';color:var(--orange);font-size:18px}.language-menu a:hover{outline:1px solid var(--orange)}.button{min-height:56px;padding:16px 26px;display:inline-flex;align-items:center;justify-content:center;gap:22px;border-radius:99px;background:var(--ink);border:1px solid var(--ink);color:#fff;font-weight:600;font-size:15px;line-height:1.4;flex-shrink:0;transition:transform .2s,background .2s}.button:hover{background:#353535;transform:translateY(-2px)}.button.small{min-height:48px;padding:12px 22px;font-size:14px}.button.outline{background:#fff;border-color:#191919;color:var(--ink)}.button.outline:hover{border-color:var(--orange)}.button svg{flex-shrink:0}.text-link{font-size:15px;font-weight:600;display:inline-flex;align-items:center;gap:12px;min-height:48px}.text-link:hover{text-decoration:underline;text-underline-offset:6px}.menu-toggle{display:none;border:1px solid #1717173d;border-radius:50%;width:46px;height:46px;align-items:center;justify-content:center;background:#fff}.mobile-nav{display:none;padding:8px 0 24px}.mobile-nav a{display:block;padding:13px 0;border-bottom:1px solid var(--line)}
.hero{display:grid;grid-template-columns:1.04fr 1fr;gap:52px;align-items:center;padding-top:42px;padding-bottom:70px}.eyebrow{font-size:11px;letter-spacing:.16em;font-weight:650;line-height:1.6;display:flex;gap:10px;align-items:center}.eyebrow::before{content:'';height:7px;width:7px;border-radius:50%;background:var(--orange);flex-shrink:0}.hero h1{font-size:clamp(62px,6.25vw,88px);margin-top:27px;line-height:1.015;letter-spacing:-.066em}.hero h1 span{position:relative;z-index:0;white-space:nowrap}.hero h1 span::after{content:'';position:absolute;bottom:.01em;height:.16em;background:var(--orange);left:0;right:0;z-index:-1;border-radius:3px}.hero-copy>p{max-width:425px;margin-top:30px;color:var(--muted);font-size:18px;line-height:1.7}.hero-actions{display:flex;align-items:center;gap:24px;margin-top:32px;flex-wrap:wrap}.fine{font-size:12px;line-height:1.6;color:var(--muted)}.hero-copy .fine{margin-top:17px}.hero-photo{margin:0;position:relative}.hero-photo img{aspect-ratio:1/1.16;object-fit:cover;object-position:center 47%;width:100%;border-radius:30px}.photo-caption{position:absolute;bottom:24px;left:24px;right:24px;padding:17px 20px;background:#fff;border-radius:18px;display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:13px;font-weight:550;line-height:1.45;box-shadow:0 6px 20px #22100505}.caption-symbol{color:var(--orange);font-size:28px;font-weight:300;line-height:1}.promise-strip{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:30px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:16px;font-weight:500;letter-spacing:-.02em}.promise-strip span{display:flex;gap:14px;align-items:center}.promise-strip svg{color:var(--orange)}.section{padding-top:116px;padding-bottom:112px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:52px;margin-top:21px}.section h2{font-size:clamp(38px,4.1vw,56px)}.section-heading>p{max-width:365px;color:var(--muted);font-size:16px;line-height:1.8}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:54px;margin-top:60px}.step-number{font-size:12px;letter-spacing:.08em;color:#873700;display:flex;align-items:center;gap:14px;margin-bottom:27px}.step-number::after{content:'';width:38px;height:2px;background:var(--orange)}.steps h3{font-size:29px;letter-spacing:-.04em}.steps p{color:var(--muted);font-size:16px;line-height:1.8;margin-top:15px;max-width:310px}.step-note{font-size:12px;font-weight:600;margin-top:27px;display:flex;align-items:center;gap:9px}.step-note svg{color:var(--orange)}
.demo-section{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:90px;padding-block:94px}.demo-copy h2{font-size:45px;margin-top:22px}.demo-copy>p{color:var(--muted);font-size:16px;line-height:1.8;max-width:370px;margin-top:24px}.subject-picker{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}.subject-picker button{border:1px solid var(--line);background:#fff;border-radius:99px;padding:11px 17px;font-size:13px;min-height:46px}.subject-picker button[aria-pressed=true]{border:2px solid var(--orange);padding:10px 16px;font-weight:650}.subject-picker button:hover{border-color:var(--orange)}.flashcard{border:1px solid #171717;border-radius:25px;padding:32px;position:relative;box-shadow:10px 10px 0 var(--orange);min-height:350px;display:flex;flex-direction:column;align-items:flex-start;justify-content:space-between;gap:24px;background:#fff}.card-top{display:flex;justify-content:space-between;align-items:center;width:100%;color:var(--muted);font-size:12px}.card-top svg{color:var(--orange)}.card-body{display:grid;align-items:center;min-height:160px;width:100%}.flashcard h3{font-size:29px;line-height:1.25;letter-spacing:-.035em;max-width:360px}.flashcard .answer-text{font-size:19px;line-height:1.6}.answer-label{display:block;color:#873700;font-size:10px;font-weight:650;letter-spacing:.15em;margin-bottom:15px}.flashcard .text-link{border:0;padding:0;background:#fff;font-size:14px;min-height:46px}.materials{display:grid;grid-template-columns:1fr 1fr;gap:108px;align-items:center}.materials-photo img{width:100%;aspect-ratio:1/1.02;object-fit:cover;object-position:center 51%;border-radius:28px}.materials-copy h2{margin-top:24px}.materials-copy>p{margin-top:26px;color:var(--muted);font-size:16px;line-height:1.8}.materials-list{list-style:none;padding:0;margin:28px 0 20px}.materials-list li{display:flex;align-items:center;gap:14px;padding:13px 0;font-size:15px;font-weight:500}.materials-list svg{color:var(--orange)}.premium{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:90px;padding-block:64px}.premium h2{font-size:43px;margin-top:22px}.premium-copy>p{color:var(--muted);font-size:16px;line-height:1.8;margin-bottom:22px}.premium-copy .fine{display:block;margin-top:18px;max-width:390px}.faq{display:grid;grid-template-columns:.85fr 1.15fr;gap:90px}.faq h2{margin-top:23px;max-width:350px}.faq-list details{border-bottom:1px solid var(--line)}.faq-list details:first-child{border-top:1px solid var(--line)}.faq-list summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:22px;cursor:pointer;padding:22px 0;font-size:16px;font-weight:600;line-height:1.5}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary::after{content:'+';font-size:25px;color:#873700;font-weight:300;flex-shrink:0}.faq-list details[open] summary::after{content:'−'}.faq-list details p{font-size:15px;color:var(--muted);line-height:1.85;padding:0 32px 23px 0}.final-section{background:var(--orange);border-radius:30px;padding:68px 70px;display:flex;align-items:center;justify-content:space-between;gap:42px;position:relative;overflow:hidden}.final-section h2{font-size:64px;letter-spacing:-.065em;position:relative}.final-section p{font-size:16px;max-width:285px;margin:0 0 24px;line-height:1.8}.final-section .button{background:var(--ink)}.site-footer{padding:70px 0 24px}.footer-top{display:flex;justify-content:space-between;gap:35px}.footer-brand p{margin-top:15px;color:var(--muted);font-size:14px}.footer-links{display:flex;gap:27px;flex-wrap:wrap;align-items:flex-start;font-size:13px}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding-top:22px;margin-top:48px;font-size:11px;color:var(--muted)}
dialog{padding:0;border:1px solid #1717171a;border-radius:28px;width:min(520px,calc(100% - 32px));max-height:calc(100dvh - 40px);background:#fff;color:var(--ink);box-shadow:0 22px 80px #0002}dialog::backdrop{background:#17171780;backdrop-filter:blur(4px)}dialog[open]{animation:sheet-in .3s cubic-bezier(.2,.7,.2,1)}.dialog-inner{padding:38px}.dialog-close{margin-left:auto;display:flex;align-items:center;justify-content:center;border:1px solid #17171759;border-radius:50%;width:46px;height:46px;background:#fff}.dialog-inner h2{font-size:35px;margin-top:20px}.dialog-inner>p{font-size:15px;color:var(--muted);margin-top:18px}.store-links{display:grid;gap:12px;margin:30px 0 18px}.store-links a{justify-content:space-between}.dialog-inner .fine{font-size:12px}.legal-page{padding:75px 0 50px;max-width:790px}.legal-page h1{font-size:60px;margin:30px 0 18px;overflow-wrap:anywhere}.legal-page .legal-intro{font-size:20px;margin-block:20px 38px;color:var(--muted)}.legal-content{margin-top:50px}.legal-content h2{font-size:23px;line-height:1.35;letter-spacing:-.025em;margin:38px 0 16px}.legal-content p{font-size:16px;line-height:1.85;color:#484845;overflow-wrap:anywhere}.legal-content strong{color:var(--ink);font-weight:600}.legal-content a{text-decoration:underline;text-underline-offset:3px}.contact-email{font-size:clamp(23px,5vw,40px);font-weight:550;letter-spacing:-.035em;border-bottom:3px solid var(--orange);display:inline-block;margin:20px 0 25px;overflow-wrap:anywhere}.contact-page{min-height:65vh}.contact-page .contact-extra{border-top:1px solid var(--line);padding-top:35px;margin-top:38px}.error-page{padding-block:100px;min-height:65vh}.error-page h1{max-width:650px}.error-page p{margin-bottom:28px;max-width:520px}.site-error .footer-links{display:none}.no-js-download{padding:15px;border:1px solid var(--orange);border-radius:16px;margin-top:20px}.no-js-download a{text-decoration:underline}svg{vertical-align:middle}.reveal-in{animation:rise-in .7s both}.hero-photo{animation:rise-in .85s .1s both}
@keyframes rise-in{from{opacity:0;transform:translateY(15px)}to{opacity:1;transform:none}}@keyframes sheet-in{from{opacity:0;transform:translateY(32px)}to{opacity:1;transform:none}}
@media(min-width:1500px){.hero{padding-top:58px;padding-bottom:82px}.hero-photo img{max-height:650px}.hero h1{font-size:90px}}
@media(max-width:1150px){.desktop-nav{gap:18px;font-size:13px}.header-actions{gap:17px}.wrap{width:calc(100% - 64px)}.hero{gap:32px}.hero h1{font-size:68px}.hero-actions{gap:10px}.demo-section,.materials,.premium,.faq{gap:55px}.steps{gap:32px}.final-section{padding:55px}.final-section h2{font-size:54px}}
@media(max-width:950px){.desktop-nav{display:none}.menu-toggle{display:flex}.mobile-nav[data-open=true]{display:block}.hero h1{font-size:57px}.hero-copy>p{font-size:16px}.hero-photo img{aspect-ratio:1/1.4}.hero-actions{align-items:flex-start;flex-direction:column}.promise-strip{font-size:14px;gap:15px}.promise-strip span{gap:8px}.section-heading{align-items:start;flex-direction:column;gap:24px}.section-heading>p{max-width:580px}.section{padding-block:82px}.demo-copy h2{font-size:36px}.demo-section{gap:40px}.flashcard{padding:25px}.flashcard h3{font-size:25px}.materials{gap:45px}.materials h2{font-size:39px}.premium h2{font-size:36px}.faq{gap:45px}.footer-links{gap:18px}.final-section h2{font-size:48px}}
@media(max-width:700px){html{scroll-padding-top:90px}.wrap{width:calc(100% - 40px)}.header-inner{min-height:78px;gap:18px}.brand{font-size:30px}.header-actions{gap:16px}.header-actions>.button{display:none}.hero{grid-template-columns:1fr;padding-top:38px;padding-bottom:40px;gap:33px}.hero h1{font-size:clamp(55px,12.5vw,76px);margin-top:22px;line-height:1.04}.hero-copy>p{font-size:17px;max-width:490px;margin-top:26px}.hero-actions{margin-top:26px;flex-direction:row;align-items:center;gap:20px}.hero .button{min-height:56px}.hero .fine{font-size:11px}.hero-photo img{aspect-ratio:1/.92;object-position:center 57%;border-radius:24px}.photo-caption{left:17px;right:17px;bottom:17px;padding:13px 17px;font-size:12px}.eyebrow{font-size:10px;letter-spacing:.12em}.promise-strip{flex-direction:column;align-items:flex-start;gap:17px;padding:26px 0;font-size:15px}.promise-strip span{gap:15px}.section{padding-block:67px}.section h2{font-size:38px}.section-heading{gap:22px}.steps{grid-template-columns:1fr;gap:34px;margin-top:40px}.step-number{margin-bottom:16px}.steps h3{font-size:28px}.steps p{max-width:none;margin-top:13px}.step-note{margin-top:15px}.steps article+article{border-top:1px solid var(--line);padding-top:30px}.demo-section{grid-template-columns:1fr;gap:37px;padding:65px 0 72px}.demo-copy h2{font-size:38px}.demo-copy>p{max-width:100%;margin-top:21px}.flashcard{margin-right:10px;min-height:330px;padding:28px;box-shadow:8px 8px 0 var(--orange);border-radius:23px}.flashcard h3{font-size:27px}.card-body{min-height:145px}.subject-picker{margin-top:23px}.materials{grid-template-columns:1fr;gap:36px}.materials-photo{order:2}.materials-photo img{aspect-ratio:1/.95;object-position:center 55%;border-radius:24px}.materials-copy>p{margin-top:22px}.materials-list{margin-top:20px}.premium{grid-template-columns:1fr;gap:23px;padding-block:55px}.premium h2{font-size:38px}.premium-copy .fine{max-width:none}.faq{grid-template-columns:1fr;gap:30px}.faq h2{max-width:none}.faq-list summary{font-size:16px}.final-section{padding:38px 27px;display:block;border-radius:24px}.final-section h2{font-size:48px}.final-section p{max-width:none;margin:25px 0}.site-footer{padding-top:50px}.footer-top{flex-direction:column;gap:33px}.footer-links{gap:12px 24px;font-size:13px}.footer-links a{min-height:36px;display:inline-flex;align-items:center}.footer-bottom{flex-direction:column;gap:7px;margin-top:24px;padding-top:20px;font-size:11px}dialog{margin: auto 0 0;width:100%;max-width:none;max-height:calc(100dvh - 15px);border-radius:28px 28px 0 0;border-bottom:none}.dialog-inner{padding:25px 24px calc(30px + env(safe-area-inset-bottom))}.dialog-inner h2{font-size:33px}.dialog-inner>p{margin-top:17px}.legal-page{padding-top:42px}.legal-page h1{font-size:42px}.legal-content h2{font-size:23px}.legal-page .legal-intro{font-size:18px}.error-page{padding-top:70px}}
@media(max-width:360px){.wrap{width:calc(100% - 32px)}.hero h1{font-size:49px}.hero-actions{gap:9px}.hero-actions .text-link{margin-left:3px}.header-actions{gap:12px}.final-section h2{font-size:40px}.subject-picker{gap:8px}.subject-picker button{padding-inline:14px}.subject-picker button[aria-pressed=true]{padding-inline:13px}.flashcard{padding:23px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}