:root{color-scheme:light dark;--bg:#f5f7fb;--paper:#fff;--ink:#1b2230;--muted:#546174;--line:#d6dce5;--blue:#2b4cff;--on-blue:#fff;--string:#227347}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit}header,main,footer{max-width:1080px;margin:auto;padding-inline:32px}header{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:88px}.brand{font:32px/1.2 Georgia,serif;text-decoration:none;letter-spacing:-1px}.brand span{color:var(--blue)}.access-note{font-size:14px;color:var(--muted)}.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:64px;align-items:center;padding:64px 0 80px}h1,h2{font-family:Georgia,serif;font-weight:400;letter-spacing:-.035em;line-height:1.08}h1{font-size:clamp(48px,6vw,76px);margin:0 0 26px}.intro>p{color:var(--muted);max-width:35ch;margin:0 0 30px}.primary{display:inline-flex;align-items:center;gap:28px;padding:15px 22px;background:var(--blue);color:var(--on-blue);border-radius:10px;font-weight:600;text-decoration:none;min-height:52px}.primary:hover{filter:brightness(.92)}a:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.first-lesson{border:1px solid var(--line);background:var(--paper);border-radius:16px;overflow:hidden;box-shadow:0 18px 50px #19274209;transform:rotate(-1deg)}.lesson-label{margin:0;padding:17px 24px;border-bottom:1px solid var(--line);font-size:14px;color:var(--muted)}pre{margin:0;padding:30px 24px;overflow:auto;font:clamp(13px,1.4vw,16px)/2 ui-monospace,SFMono-Regular,Consolas,monospace}.function,.number{color:var(--blue)}.string{color:var(--string)}.output{padding:20px 24px;background:var(--bg);border-block:1px solid var(--line)}.output>span{display:block;color:var(--muted);font-size:12px;margin-bottom:12px}.output samp{font:15px/1.8 ui-monospace,monospace}.lesson-caption{padding:0 24px;font-size:14px;color:var(--muted)}.how{display:grid;grid-template-columns:1fr 1.1fr;gap:64px;border-top:1px solid var(--line);padding:56px 0}.how h2{font-size:38px;margin:4px 0}.steps{display:grid;gap:30px}h3{font-size:18px;margin:0 0 7px}.steps p,.private p{color:var(--muted);margin:0;max-width:56ch;font-size:16px}.private{padding:40px 0 64px;border-top:1px solid var(--line)}.private h2{font-size:30px;margin:0 0 20px}.private p+p{margin-top:15px}footer{border-top:1px solid var(--line);display:flex;align-items:center;gap:24px;padding-block:28px}footer p{font-size:14px;color:var(--muted)}
@media(prefers-color-scheme:dark){:root{--bg:#171b22;--paper:#202733;--ink:#edf1f7;--muted:#afbacb;--line:#364152;--blue:#95a7ff;--on-blue:#131b3a;--string:#8bdaad}}
@media(max-width:700px){header,main,footer{padding-inline:22px}header{min-height:76px}.brand{font-size:28px}.access-note{font-size:12px;max-width:18ch;text-align:right}.hero{grid-template-columns:1fr;gap:40px;padding:32px 0 48px}h1{font-size:54px}.intro>p{font-size:17px;margin-bottom:24px}.primary{width:100%;justify-content:space-between}.first-lesson{transform:none}pre{font-size:15px}.how{grid-template-columns:1fr;gap:32px;padding:40px 0}.how h2{font-size:34px}.private{padding-bottom:40px}footer{align-items:flex-start;flex-direction:column;gap:4px}footer p{margin:0}}
.buddy-landing{--bg:#faf7ee;--paper:#fffdf7;--ink:#182735;--muted:#59635f;--line:#dcdccf;--blue:#245e50;--on-blue:#fff;color-scheme:light}.invite-eyebrow{color:#986043!important;font-size:11px;letter-spacing:.16em;font-weight:700;margin-bottom:20px!important}.intro>.invite-note{font-size:13px;max-width:42ch;margin-top:20px}.invite-letter{background:var(--paper);border:1px solid var(--line);padding:10px 0 26px;transform:rotate(2deg);box-shadow:0 16px 32px #433a2410}.invite-letter h2{font-size:42px;margin:26px 32px 20px}.invite-letter>p:last-child{font:italic 20px/1.8 Georgia,serif;margin:0 32px;color:var(--muted)}.invite-marks{display:flex;align-items:center;gap:14px;margin:30px 32px 0}.invite-marks span{border:1px solid var(--line);border-radius:50%;width:90px;height:90px;display:grid;place-items:center;background:#e8eee3;font-size:13px;color:var(--blue)}.invite-marks i{color:#986043;font-style:normal;font-size:25px}.buddy-landing .primary{border-radius:28px;font-size:16px}.buddy-landing [hidden]{display:none}@media(max-width:700px){.buddy-landing h1{font-size:48px}.invite-letter{transform:none}.buddy-landing .hero{gap:28px}.invite-marks span{height:70px;width:70px}.invite-letter h2{font-size:32px}.invite-letter>p:last-child{font-size:18px}}