/* Landing uses the existing notebook palette and a small, consistent 8px radius. */
:root{--ink:#182347;--muted:#556079;--paper:#fffefb;--line:#dce0e9;--blue:#294ce4;--wash:#f0f2ff;--surface:#fffefb;--button-ink:#fff;--radius:8px;color-scheme:light}
*{box-sizing:border-box}html{scroll-behavior:auto}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 'DM Sans',system-ui,sans-serif}a{color:var(--blue);text-underline-offset:4px}a:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:5px}h1,h2,h3{font-family:'Space Grotesk',system-ui,sans-serif;line-height:1.12;letter-spacing:-.04em}h1{font-size:clamp(36px,4.45vw,64px);max-width:1050px;margin:0 0 22px}h1 span{color:var(--blue)}h2{font-size:clamp(30px,3.3vw,44px);margin:0 0 22px}h3{font-size:25px;margin:0 0 10px}p{margin:0 0 22px}.wrap{width:min(1240px,calc(100% - 80px));margin-inline:auto}.site-header{height:80px;display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line)}.wordmark{display:inline-flex;align-items:center;gap:10px;font:700 27px 'Space Grotesk',system-ui,sans-serif;letter-spacing:-1px;color:var(--ink);text-decoration:none}.logo{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;color:var(--button-ink);background:var(--blue);font-size:32px;line-height:1}.brand-dot{color:var(--blue);margin-left:-10px}.header-nav{display:flex;align-items:center;gap:28px;font-size:14px;font-weight:600}.header-nav a{color:var(--ink);text-decoration:none}.header-nav a:hover{text-decoration:underline}.skip-link{position:absolute;top:8px;left:16px;transform:translateY(-200%);padding:10px;background:var(--paper);z-index:10}.skip-link:focus{transform:none}.hero{padding:52px 0 64px}.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;color:var(--muted);margin-bottom:20px}.hero-intro{max-width:660px;font-size:20px;color:var(--muted);line-height:1.55;margin-bottom:26px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:36px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 20px;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;color:var(--ink);font-weight:700;font-size:15px;line-height:1.5;background:var(--surface)}.button.primary{background:var(--blue);border-color:var(--blue);color:var(--button-ink)}.button:hover{border-color:var(--blue)}.button.primary:hover{filter:brightness(.92)}.button:active{transform:translateY(1px)}.lesson-preview{margin:0;background:var(--wash);border:1px solid var(--line);padding:24px 24px 0;border-radius:var(--radius);overflow:hidden}.lesson-preview img{display:block;width:100%;height:auto;border:1px solid var(--line);border-bottom:0;border-radius:4px 4px 0 0}.lesson-preview figcaption{font-size:13px;color:var(--muted);padding:14px 0}.section{padding:64px 0;border-top:1px solid var(--line)}.how-layout{display:grid;grid-template-columns:1fr 1.5fr;gap:80px}.section-intro{color:var(--muted);max-width:52ch}.steps{list-style:none;padding:0;margin:0;counter-reset:step}.steps li{position:relative;padding:0 0 28px 56px;counter-increment:step}.steps li:not(:last-child){border-left:1px solid var(--line);margin-left:17px;padding-left:38px}.steps li:last-child{padding-bottom:0}.steps li:before{content:counter(step);position:absolute;left:0;top:0;width:34px;height:34px;display:grid;place-items:center;background:var(--wash);border:1px solid var(--line);border-radius:50%;font-weight:700;font-size:14px;color:var(--blue)}.steps li:not(:last-child):before{left:-17px}.steps p{color:var(--muted);margin:0;max-width:47ch}.audience{background:var(--wash);border-radius:var(--radius);padding:40px;display:grid;grid-template-columns:1.4fr 1fr;gap:60px}.audience p{max-width:55ch}.audience .note{font-size:14px;color:var(--muted);margin:0}.rewards{border-left:1px solid var(--line);padding-left:35px;display:flex;align-items:center;gap:20px}.rewards img{width:90px;height:145px;object-fit:contain}.rewards h3{font-size:22px}.rewards p{font-size:15px;margin:0;color:var(--muted)}.browse{padding-top:64px;scroll-margin-top:24px}.browse>p{max-width:65ch;color:var(--muted)}details{border-top:1px solid var(--line)}details:last-child{border-bottom:1px solid var(--line)}summary{cursor:pointer;min-height:62px;padding:18px 4px;font-weight:700;font-size:18px}summary span{font-weight:400;font-size:14px;color:var(--muted);margin-left:10px}.point-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:6px 24px;margin:0;padding:0 0 22px}.point-list a{display:flex;align-items:baseline;gap:16px;padding:10px 12px;min-height:44px;text-decoration:none;color:var(--ink);border-radius:var(--radius);font-size:15px}.point-list a:hover{background:var(--wash)}.point-list b{min-width:56px;color:var(--blue);font-size:14px}.site-footer{padding:32px 0;margin-top:64px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);display:flex;justify-content:space-between;gap:30px}.site-footer p{margin:0;max-width:75ch}
@media(prefers-reduced-motion:no-preference){.button{transition:transform .15s,background-color .15s,border-color .15s}}
@media(prefers-color-scheme:dark){:root{--ink:#ebedff;--muted:#b7c0dc;--paper:#171b2d;--line:#3c4563;--blue:#aabaff;--wash:#222a43;--surface:#20263c;--button-ink:#17203e;color-scheme:dark}}
@media(max-width:767px){.wrap{width:calc(100% - 40px)}.site-header{height:72px}.wordmark{font-size:23px}.logo{width:34px;height:34px;font-size:28px}.header-nav{gap:14px}.header-nav .how-link{display:none}.hero{padding:36px 0 40px}h1{font-size:38px;letter-spacing:-.045em}.hero-intro{font-size:18px}.actions{display:grid;gap:10px;margin-bottom:28px}.button{width:100%;text-align:center}.lesson-preview{padding:10px 10px 0}.lesson-preview figcaption{font-size:12px;line-height:1.5}.section{padding:40px 0}.how-layout{grid-template-columns:1fr;gap:20px}.audience{grid-template-columns:1fr;padding:24px;gap:28px}.rewards{border-left:0;border-top:1px solid var(--line);padding:24px 0 0}.point-list{grid-template-columns:1fr;gap:4px}.browse{padding-top:40px}summary{font-size:16px}summary span{display:block;margin:2px 0 0 19px}.site-footer{margin-top:40px;flex-direction:column;gap:16px}}