:root{--bg:#FBFAF7;--surface:#FFFFFF;--surface2:#F0F2F8;--text:#0E1734;--muted:#46506B;--accent:#1B4FBF;--btn-bg:#1B4FBF;--btn-text:#FFFFFF;--line:#D5DBE8;--shadow:0 18px 40px rgba(14,23,52,.18);color-scheme:light}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#070B18;--surface:#0E1734;--surface2:#0A1126;--text:#F3F6FD;--muted:#A8B3CC;--accent:#4F8EF7;--btn-bg:#4F8EF7;--btn-text:#070B18;--line:#222E54;--shadow:0 18px 44px rgba(0,0,0,.55);color-scheme:dark}}
:root[data-theme=dark]{--bg:#070B18;--surface:#0E1734;--surface2:#0A1126;--text:#F3F6FD;--muted:#A8B3CC;--accent:#4F8EF7;--btn-bg:#4F8EF7;--btn-text:#070B18;--line:#222E54;--shadow:0 18px 44px rgba(0,0,0,.55);color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;overflow-wrap:break-word}
a{color:var(--accent);text-underline-offset:3px}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:4px}
.wrap{max-width:1040px;margin:0 auto;padding:0 20px}
h1,h2,h3{font-family:Georgia,"Iowan Old Style","Palatino Linotype",Palatino,serif}
.skip{position:absolute;left:12px;top:-100px;background:var(--surface);color:var(--text);padding:10px 14px;z-index:5}
.skip:focus{top:10px}
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 0;border-bottom:1px solid var(--line)}
.brand{font-weight:650;font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--text);text-decoration:none}
.toggle{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 14px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--text);font:600 14px/1 system-ui,sans-serif;cursor:pointer;white-space:nowrap}
.toggle .dot{width:14px;height:14px;border-radius:50%;background:linear-gradient(90deg,var(--text) 50%,transparent 50%);border:2px solid var(--text)}
.hero{display:grid;gap:20px;justify-items:center;text-align:center;padding:24px 0 40px}
.cover{display:block;width:150px;height:auto;aspect-ratio:992/1586;border-radius:3px;box-shadow:var(--shadow);border:1px solid var(--line)}
.eyebrow{margin:0;font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}
h1{margin:8px 0 12px;font-size:clamp(32px,9vw,46px);line-height:1.1;letter-spacing:-.01em;font-weight:700}
.lede{margin:0 auto;max-width:36ch;font-size:18px;line-height:1.5;color:var(--muted)}
.byline{margin:14px 0 0;font-size:15px;color:var(--muted)}
.byline strong{color:var(--text)}
.btn{display:flex;align-items:center;justify-content:center;gap:10px;min-height:54px;padding:14px 24px;border-radius:10px;border:1px solid var(--accent);background:var(--btn-bg);color:var(--btn-text);font:700 18px/1.25 system-ui,sans-serif;text-decoration:none;text-align:center;white-space:normal}
.btn:hover{filter:brightness(1.08)}
.hero .btn{width:100%;max-width:340px;margin:20px auto 0}
.textlink{display:inline-block;margin-top:12px;font-size:15px;font-weight:600}
section{padding:44px 0;border-top:1px solid var(--line)}
h2{margin:8px 0 16px;font-size:clamp(26px,6.5vw,36px);line-height:1.2;font-weight:700;letter-spacing:-.01em}
h3{margin:0 0 6px;font-size:19px;line-height:1.3}
.reading{max-width:680px}
.muted{color:var(--muted)}
.small{font-size:14px;color:var(--muted)}
#get{background:var(--surface2)}
.stores{display:grid;gap:12px;margin:18px 0 12px}
.store{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:64px;padding:14px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--text);text-decoration:none}
.store:hover{border-color:var(--accent)}
.store b{display:block;font-size:18px;line-height:1.25}
.store span{display:block;font-size:14px;color:var(--muted)}
.store i{font-style:normal;font-weight:700;color:var(--accent);font-size:20px}
.video{position:relative;max-width:420px;margin:18px auto 0;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:#000}
.video video{display:block;width:100%;height:auto}
.video button{position:absolute;inset:0;width:100%;border:0;background:rgba(7,11,24,.35);color:#fff;font:700 18px system-ui,sans-serif;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:10px}
.video button[hidden]{display:none}
.points{display:grid;gap:14px;margin:20px 0 0;padding:0;list-style:none}
.points li{padding:16px 18px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.points p{margin:0;color:var(--muted);font-size:16px}
.points b{display:block;color:var(--text);font-size:17px;margin-bottom:2px}
.chapters{list-style:none;margin:18px 0 0;padding:0;counter-reset:ch;display:grid}
.chapters li{counter-increment:ch;display:grid;grid-template-columns:2.6em 1fr;gap:6px;padding:12px 0;border-bottom:1px solid var(--line)}
.chapters li::before{content:counter(ch,decimal-leading-zero);font:700 14px/1.9 system-ui,sans-serif;color:var(--accent)}
.chapters li.app{counter-increment:none}
.chapters li.app::before{content:"+"}
blockquote{margin:18px 0 0;padding:6px 0 6px 18px;border-left:3px solid var(--accent);font-family:Georgia,serif;font-size:18px;line-height:1.7}
blockquote p{margin:0 0 14px}
.cite{font:14px/1.5 system-ui,sans-serif;color:var(--muted);margin-top:10px}
.fit{display:grid;gap:16px;margin-top:18px}
.fit>div{padding:18px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.fit ul{margin:8px 0 0;padding-left:20px}
.fit li{margin:6px 0}
pre{margin:16px 0 0;padding:16px;border-radius:10px;background:var(--surface2);border:1px solid var(--line);color:var(--text);overflow-x:auto;font-size:14px;line-height:1.6}
code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}
p code,li code{font-size:.92em;overflow-wrap:anywhere}
details{border-bottom:1px solid var(--line);padding:14px 0}
summary{cursor:pointer;font-weight:650;min-height:28px}
details p{margin:10px 0 0;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:26px 0 40px;font-size:14px;color:var(--muted)}
footer a{margin-right:14px}
@media (min-width:760px){
  body{font-size:18px}
  .wrap{padding:0 32px}
  .hero{grid-template-columns:auto 1fr;gap:56px;justify-items:start;text-align:left;padding:64px 0 72px;align-items:center}
  .cover{width:300px}
  .lede{margin:0;max-width:34ch;font-size:21px}
  .hero .btn{width:auto;max-width:none;margin:26px 0 0;display:inline-flex;padding:16px 34px}
  h1{font-size:clamp(46px,5.4vw,60px)}
  .stores{grid-template-columns:repeat(3,1fr)}
  .points{grid-template-columns:repeat(3,1fr)}
  .chapters{grid-template-columns:1fr 1fr;column-gap:48px}
  .fit{grid-template-columns:1fr 1fr}
  section{padding:68px 0}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.page{padding:40px 0}