:root{--brand:#465fff;--brand-600:#3641f5;--brand-700:#2a31d8;--brand-50:#ecf3ff;--ink:#0f1729;--ink-2:#344054;--muted:#667085;--line:#e4e7ec;--soft:#f8fafc}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:#fff;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--brand-700)}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
header.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.logo b{font-size:17px;font-weight:800}
.logo small{display:block;font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.06em;margin-top:-3px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 16px;border-radius:12px;font-weight:700;font-size:14px;text-decoration:none;background:var(--brand);color:#fff}
.btn:hover{background:var(--brand-600)}
.hero{background:linear-gradient(180deg,#f5f8ff,#fff);border-bottom:1px solid var(--line);padding:48px 0 36px}
.hero h1{font-size:clamp(28px,4.4vw,42px);line-height:1.15;letter-spacing:-.02em;margin:8px 0 10px;font-weight:800}
.hero p{color:var(--ink-2);margin:0;max-width:760px}
.eyebrow{color:var(--brand);font-weight:800;font-size:13px;letter-spacing:.12em;text-transform:uppercase}
.layout{display:grid;grid-template-columns:240px 1fr;gap:48px;padding:40px 20px 72px}
.toc{position:sticky;top:90px;align-self:start;font-size:14px;border-left:2px solid var(--line);padding-left:16px}
.toc b{display:block;margin-bottom:8px;color:var(--muted);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.toc a{display:block;color:var(--ink-2);text-decoration:none;padding:4px 0}
.toc a:hover{color:var(--brand)}
article{max-width:760px}
article h2{font-size:22px;letter-spacing:-.01em;margin:36px 0 10px;scroll-margin-top:90px}
article h2:first-child{margin-top:0}
article h3{font-size:17px;margin:22px 0 6px}
article p,article li{color:var(--ink-2);font-size:16px}
article ul,article ol{padding-left:22px}
.note{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:14px 16px;font-size:14.5px;color:var(--ink-2)}
.faq details{border:1px solid var(--line);border-radius:14px;padding:0 18px;margin:10px 0;background:#fff}
.faq summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:700;display:flex;justify-content:space-between;gap:14px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--brand);font-size:22px;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:0 0 16px}
footer{border-top:1px solid var(--line);padding:32px 0 44px;color:var(--muted);font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}
.foot-links{display:flex;gap:18px;flex-wrap:wrap;align-items:center}
.foot-links a{color:var(--muted);text-decoration:none}
.foot-links a:hover{color:var(--brand)}
.wa-float{position:fixed;right:18px;bottom:18px;z-index:60;width:58px;height:58px;border-radius:50%;background:#25d366;display:none;place-items:center;box-shadow:0 10px 24px -6px rgba(37,211,102,.6)}
.wa-float.on{display:grid}
.wa-foot{display:none;width:36px;height:36px;border-radius:50%;background:#25d366;place-items:center}
.wa-foot.on{display:inline-grid}
@media(max-width:860px){.layout{grid-template-columns:1fr;gap:20px}.toc{position:static;border-left:0;padding:0;border-bottom:1px solid var(--line);padding-bottom:14px}}