:root{
  --bg:#f5f5f7;--card:#fff;--ink:#1d1d1f;--ink2:#6e6e73;--ink3:#a1a1a6;
  --line:#e3e3e8;--soft:#f0f0f3;--accent:#0071e3;--accent-h:#0077ed;--ok:#248a3d;--rec:#ff3b30;
  --r:22px;--r-sm:12px;--shadow:0 1px 2px rgba(0,0,0,.04),0 8px 28px rgba(0,0,0,.06);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#000;--card:#1c1c1e;--ink:#f5f5f7;--ink2:#a1a1a6;--ink3:#6e6e73;--line:#2c2c2e;--soft:#2c2c2e;
    --accent:#0a84ff;--accent-h:#409cff;--ok:#30d158;--shadow:none}
}
*{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:72px}
body{background:var(--bg);color:var(--ink);font:17px/1.5 var(--font);-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
img,svg{display:block;max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:var(--card);padding:8px 12px;border-radius:8px;z-index:9}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}

/* nav */
.nav{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(180%) blur(18px);-webkit-backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:56px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.brand img{width:28px;height:28px;border-radius:7px}
.nav-links{display:flex;gap:22px;align-items:center}
.nav-links a{color:var(--ink2);text-decoration:none;font-size:14px}
.nav-links a:hover{color:var(--ink)}
.nav-links a.btn,.nav-links a.btn:hover{color:#fff}
@media (max-width:720px){.nav-links a:not(.btn){display:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 22px;border-radius:999px;font:600 16px var(--font);text-decoration:none;border:0;cursor:pointer;transition:background .15s,transform .15s}
.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-h)}
.btn-ghost{background:transparent;color:var(--accent);box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn-ghost:hover{background:color-mix(in srgb,var(--accent) 8%,transparent)}
.btn-sm{min-height:36px;padding:0 16px;font-size:14px}
.btn:active{transform:scale(.98)}

/* type */
.eyebrow{color:var(--accent);font-weight:600;font-size:13px;letter-spacing:.08em;text-transform:uppercase}
h1{font-size:clamp(40px,7vw,72px);line-height:1.04;letter-spacing:-.035em;font-weight:700}
h2{font-size:clamp(30px,4.6vw,48px);line-height:1.08;letter-spacing:-.03em;font-weight:700}
h3{font-size:21px;line-height:1.25;letter-spacing:-.01em;font-weight:650}
.lead{font-size:clamp(19px,2.2vw,23px);color:var(--ink2);line-height:1.4;max-width:34em}
.muted{color:var(--ink2)}
.small{font-size:14px;color:var(--ink2)}
section{padding:96px 0}
@media (max-width:720px){section{padding:64px 0}}
.center{text-align:center}.center .lead{margin-inline:auto}

/* cards */
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:28px}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}
@media (max-width:900px){.g3{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.g2,.g3{grid-template-columns:1fr}}

/* long-form pages */
.doc{max-width:720px;padding:56px 20px 96px}
.doc h1{font-size:clamp(32px,5vw,44px);margin-bottom:8px}
.doc h2{font-size:22px;margin:36px 0 8px;letter-spacing:-.01em}
.doc p,.doc li{color:var(--ink);margin-bottom:10px}
.doc ul{padding-left:22px}
.note{background:color-mix(in srgb,#f5a623 16%,var(--card));border-radius:var(--r-sm);padding:14px 16px;font-size:15px;margin:20px 0}

footer{border-top:1px solid var(--line);padding:32px 0 48px;font-size:13px;color:var(--ink2)}
footer .wrap{display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between}
footer a{color:var(--ink2)}