:root{--bg:#fff;--surface:#f5f5f7;--fg:#1d1d1f;--fg-2:#424245;--muted:#6e6e73;--border:#d2d2d7;--accent:#0071e3;--accent-hover:#0077ed;--good:#16a34a;--font:"SF Pro Text","Helvetica Neue",Helvetica,Arial,sans-serif;--display:"SF Pro Display","Helvetica Neue",Helvetica,Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.55 var(--font);-webkit-font-smoothing:antialiased}
a{color:var(--accent)}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
header{position:sticky;top:0;z-index:1;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--surface)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:56px}
.logo{font:700 22px var(--display);letter-spacing:-.6px;color:var(--fg);text-decoration:none}.logo span{color:var(--accent)}
nav a{color:var(--fg-2);text-decoration:none;margin-left:24px;font-size:14px}
h1,h2,h3{font-family:var(--display);letter-spacing:-.015em;line-height:1.1;margin:0}
h1{font-size:clamp(36px,6vw,64px);font-weight:700;max-width:14ch}
h2{font-size:clamp(28px,4vw,40px);font-weight:650;margin-bottom:16px}
h3{font-size:21px;font-weight:600;margin-bottom:8px}
p{margin:0 0 12px;color:var(--fg-2)}
section{padding:80px 0}section.alt{background:var(--surface)}
.hero{padding:96px 0 80px}.hero p.lead{font-size:21px;max-width:36ch;margin:20px 0 32px}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;font-weight:600;padding:14px 28px;border-radius:980px;min-height:48px}.btn:hover{background:var(--accent-hover)}
.btn.ghost{background:transparent;color:var(--accent);padding-inline:12px}
.badge{display:inline-block;font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.grid{display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));margin-top:40px}
.card{background:var(--bg);border-radius:20px;padding:28px}section:not(.alt) .card{background:var(--surface)}
.steps{counter-reset:s;list-style:none;padding:0}.steps li{counter-increment:s}.steps li::before{content:counter(s);display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;margin-bottom:16px}
.ok{color:var(--good);font-weight:600}
.exchange{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));margin-top:32px}
.exchange div{border-left:3px solid var(--accent);padding-left:16px}
details{border-bottom:1px solid var(--border);padding:8px 0}summary{cursor:pointer;font-weight:600;padding:12px 0;min-height:44px}details p{margin-top:4px}
.cta{text-align:center}.cta p{margin:16px auto 28px;max-width:44ch}
footer{padding:40px 0;color:var(--muted);font-size:14px;border-top:1px solid var(--surface)}footer a{color:var(--muted);margin-right:20px}
@media(max-width:640px){header nav a{display:none}header nav a.nav-docs{display:inline;margin-left:0}section{padding:56px 0}.hero{padding:56px 0}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.doc{max-width:760px;padding-top:48px;padding-bottom:80px}.doc h1{max-width:none;margin-bottom:16px}
.doc h2{font-size:28px;margin:48px 0 12px;scroll-margin-top:72px}.doc h3{margin:24px 0 8px;scroll-margin-top:72px}
.doc li{color:var(--fg-2);margin-bottom:6px}.doc strong{color:var(--fg)}
.doc table{width:100%;border-collapse:collapse;margin:16px 0;font-size:15px}.doc th,.doc td{text-align:left;vertical-align:top;padding:10px 12px;border-bottom:1px solid var(--border)}.doc th{color:var(--muted);font-weight:600}
.toc{background:var(--surface);border-radius:20px;padding:20px 28px;margin:24px 0}.toc ul{margin:0;padding:0;list-style:none;columns:2;column-gap:32px}.toc a{text-decoration:none}
@media(max-width:640px){.toc ul{columns:1}.doc table{font-size:14px}.doc th,.doc td{padding:8px 6px}}
.models{width:100%;border-collapse:collapse;margin:24px 0 12px}.models th,.models td{text-align:left;vertical-align:top;padding:12px;border-bottom:1px solid var(--border)}.models th{color:var(--muted);font-size:14px;font-weight:600}
.small{font-size:14px;color:var(--muted)}
.doc-link{display:block;text-decoration:none;color:inherit}.doc-link:hover h3{color:var(--accent)}.doc-link:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.hero-grid{display:grid;grid-template-columns:1fr auto;gap:48px;align-items:center}
.promo{display:block;width:min(320px,80vw);height:auto;aspect-ratio:9/16;border-radius:28px;background:var(--surface);box-shadow:0 20px 60px rgba(0,0,0,.12)}
@media(max-width:800px){.hero-grid{grid-template-columns:1fr}.promo{margin:0 auto}}
.notice{background:var(--surface);border-left:3px solid var(--accent);border-radius:12px;padding:16px 20px;font-size:15px}