@font-face{font-family:Nunito;src:url('/assets/Nunito-SemiBold.ttf') format('truetype');font-weight:600;font-display:swap}
@font-face{font-family:Nunito;src:url('/assets/Nunito-ExtraBold.ttf') format('truetype');font-weight:800;font-display:swap}
:root{--paper:#F2F2F0;--white:#fff;--ink:#202023;--muted:#59565f;--purple:#7544DE;--lavender:#E9DFFC;--line:#dedbe4;--focus:#432280;color-scheme:light}
*{box-sizing:border-box}html{scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font:600 17px/1.65 Nunito,system-ui,sans-serif}a{color:var(--purple);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible{outline:3px solid var(--focus);outline-offset:5px;border-radius:3px}a:active{filter:brightness(.85)}.wrap{width:min(1180px,calc(100% - 64px));margin-inline:auto}.skip{position:absolute;left:20px;top:-100px;background:white;padding:12px;z-index:5}.skip:focus{top:12px}.header{display:flex;justify-content:space-between;align-items:center;min-height:108px;gap:24px}.brand{font-size:34px;font-weight:800;letter-spacing:-1.5px;text-decoration:none;color:var(--ink)}.brand span{color:var(--purple)}nav{display:flex;gap:28px;flex-wrap:wrap}nav a{color:var(--muted);text-decoration:none;padding:10px 0;font-size:15px}nav a[aria-current]{color:var(--purple);text-decoration:underline;text-decoration-thickness:2px}h1,h2,h3,strong,dt{font-weight:800}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(40px,5.1vw,65px);line-height:1.09;letter-spacing:-2px;margin-bottom:26px}h2{font-size:31px;line-height:1.25;letter-spacing:-.7px}h3{font-size:24px;line-height:1.3}p{margin-bottom:20px}.hero{display:grid;grid-template-columns:1.12fr 1fr;align-items:center;gap:72px;padding:64px 0 90px}.exam{font-size:17px;color:var(--purple);margin-bottom:22px}.lead{font-size:20px;line-height:1.65;color:var(--muted);max-width:54ch}.actions{display:flex;align-items:center;gap:26px;flex-wrap:wrap;margin:30px 0 22px}.button{display:inline-flex;justify-content:center;align-items:center;min-height:52px;background:var(--purple);color:white;border-radius:14px;padding:12px 23px;font-weight:800;text-decoration:none;border:2px solid transparent;text-align:center}.button:hover{background:#6233B4}.button.secondary{background:white;color:var(--purple);border-color:var(--purple)}.text-link{font-weight:800}.availability{font-size:14px;max-width:44ch;color:var(--muted)}.notebook{position:relative;background:white;border-radius:10px 28px 28px 10px;border-left:8px solid var(--purple);box-shadow:9px 12px 0 #E9DFFC;padding:28px 32px 24px;transform:rotate(1deg)}.notebook-top{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--muted);padding-bottom:16px;border-bottom:1px solid var(--line)}.problem{font-size:45px;font-weight:800;margin:23px 0 10px;letter-spacing:-1px}.prompt{font-size:22px;line-height:1.4;margin-bottom:28px}.solution{display:flex;gap:16px;align-items:start;padding:17px 0;border-top:1px solid var(--line);font-size:16px}.solution p{margin:4px 0 0;font-size:24px;color:var(--purple);font-weight:800}.step{display:grid;place-items:center;flex:none;width:30px;height:30px;background:var(--lavender);border-radius:50%;color:#6233B4;font-weight:800}.notebook-note{font-size:14px;color:var(--muted);padding-top:16px;margin-bottom:0;border-top:1px solid var(--line)}.learning{padding:55px 0 65px;border-top:1px solid var(--line)}.section-intro{display:flex;align-items:start;gap:90px;justify-content:space-between;margin-bottom:35px}.section-intro h2{flex:1}.section-intro p{flex:1;color:var(--muted);max-width:43ch}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}.features article{padding-left:20px;border-left:3px solid var(--purple)}.features p{color:var(--muted);margin-bottom:0}.support-band{background:var(--lavender);border-radius:24px;padding:36px;display:flex;align-items:center;justify-content:space-between;gap:28px}.support-band h2{font-size:27px;margin-bottom:12px}.support-band p{margin:0}.support-band .button{flex-shrink:0}.small{font-size:14px;color:var(--muted)}.closing{max-width:90ch;margin:28px 0 64px}.document{max-width:790px;margin:50px auto 80px}.document h1{font-size:clamp(37px,5vw,55px);overflow-wrap:anywhere}.document h2{font-size:25px;margin:38px 0 14px}.document h3{font-size:21px}.document p,.document li,.document dd{line-height:1.8}.document li{margin-bottom:12px}.document ul,.document ol{padding-left:25px}.updated{color:var(--muted);font-size:14px;margin-bottom:30px}.contact{background:white;border-radius:22px;padding:28px 30px;margin:32px 0}.contact h2{margin-top:0}.contact .email{font-size:clamp(16px,3.4vw,24px);overflow-wrap:anywhere}.contact .small{margin-top:16px;margin-bottom:0}.notice{border-left:4px solid var(--purple);background:var(--lavender);padding:24px;margin:32px 0}.notice h2{margin-top:0}.notice p{margin-bottom:0}.data-list dt{font-size:20px;margin-top:26px}.data-list dd{margin:6px 0 22px;color:var(--muted)}footer{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:36px;border-top:1px solid var(--line);padding:36px 0 45px;font-size:14px;color:var(--muted)}footer .brand{font-size:29px}footer p{margin:8px 0}.footer-links{display:flex;flex-direction:column;align-items:start;gap:9px}.footer-links a{color:var(--muted)}.copyright a{overflow-wrap:anywhere}
@media(max-width:850px){.hero{gap:35px;padding-top:40px}.hero h1{font-size:47px}.notebook{padding:24px}.problem{font-size:36px}.section-intro{gap:35px}.features{gap:23px}.support-band{align-items:start;flex-direction:column}footer{grid-template-columns:1fr 1fr}.copyright{grid-column:1/-1}}
@media(max-width:620px){.wrap{width:calc(100% - 40px)}.header{align-items:start;flex-direction:column;gap:0;padding:20px 0 10px}.brand{font-size:31px}nav{gap:22px}nav a{font-size:14px}.hero{grid-template-columns:1fr;gap:37px;padding:30px 0 56px}.hero h1{font-size:clamp(38px,9.8vw,54px);letter-spacing:-1.4px}.lead{font-size:18px}.exam{margin-bottom:18px}.notebook{transform:none;margin-right:9px}.notebook-top{font-size:12px}.problem{font-size:42px}.section-intro{display:block}.section-intro h2{font-size:29px}.features{grid-template-columns:1fr;gap:30px}.features h3{font-size:23px;margin-bottom:10px}.learning{padding-top:38px;padding-bottom:40px}.support-band{padding:25px}.support-band h2{font-size:25px}.document{margin-top:35px;margin-bottom:55px}.document h1{letter-spacing:-1px}.document h2{font-size:24px}.contact{padding:24px 20px}.contact .button{width:100%}.notice{padding:20px}footer{grid-template-columns:1fr;gap:20px}.copyright{grid-column:auto}.closing{margin-bottom:40px}}
@media(min-width:621px) and (max-width:900px){.hero{grid-template-columns:1fr;gap:35px}.hero-copy{max-width:600px}.hero h1{font-size:58px}.notebook{max-width:540px;width:100%;transform:none}.hero .lead{max-width:50ch}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
