:root{
    --zg-primary:#1769ff;
    --zg-primary-dark:#0f4fc7;
    --zg-ink:#172033;
    --zg-muted:#667085;
    --zg-bg:#f7f9fc;
    --zg-card:#ffffff;
    --zg-border:#e7ebf2;
    --zg-soft:#eef5ff;
    --zg-success:#18a673;
    --zg-shadow:0 18px 55px rgba(23,32,51,.08);
    --zg-radius:18px;
    --zg-max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
    margin:0;
    font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
    color:var(--zg-ink);
    background:var(--zg-bg);
    line-height:1.75;
}
a{color:inherit}
.zg-container{width:min(var(--zg-max),calc(100% - 40px));margin:auto}
.zg-header{
    position:sticky;top:0;z-index:1000;
    background:rgba(255,255,255,.94);
    backdrop-filter:blur(14px);
    border-bottom:1px solid rgba(231,235,242,.9);
}
.zg-nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.zg-brand{display:flex;align-items:center;text-decoration:none;font-weight:900;letter-spacing:-.04em;font-size:24px}
.zg-brand-mark{
    width:34px;height:34px;border-radius:10px;margin-right:9px;
    display:grid;place-items:center;color:#fff;font-size:15px;font-weight:900;
    background:linear-gradient(135deg,var(--zg-primary),#53a4ff);
    box-shadow:0 8px 20px rgba(23,105,255,.22);
}
.zg-navlinks{display:flex;align-items:center;gap:28px}
.zg-navlinks a{text-decoration:none;font-size:14px;font-weight:650;color:#4b5565}
.zg-navlinks a:hover{color:var(--zg-primary)}
.zg-btn{
    display:inline-flex;align-items:center;justify-content:center;
    border-radius:10px;padding:11px 18px;text-decoration:none;font-weight:750;
    font-size:14px;border:1px solid transparent;transition:.2s ease;
}
.zg-btn-primary{background:var(--zg-primary);color:#fff;box-shadow:0 8px 18px rgba(23,105,255,.2)}
.zg-btn-primary:hover{background:var(--zg-primary-dark);transform:translateY(-1px)}
.zg-btn-light{background:#fff;border-color:var(--zg-border);color:var(--zg-ink)}
.zg-hero{
    background:linear-gradient(180deg,#fff 0%,#f7fbff 100%);
    padding:82px 0 64px;border-bottom:1px solid var(--zg-border)
}
.zg-kicker{
    display:inline-flex;align-items:center;gap:8px;
    background:var(--zg-soft);color:var(--zg-primary);
    padding:7px 12px;border-radius:999px;font-size:12px;font-weight:800;
    text-transform:uppercase;letter-spacing:.08em;
}
.zg-kicker:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--zg-success)}
.zg-hero h1{font-size:clamp(38px,6vw,64px);line-height:1.08;letter-spacing:-.055em;margin:20px 0 16px}
.zg-hero p{color:var(--zg-muted);font-size:18px;margin:0}
.zg-meta{gap:10px;margin-top:25px}
.zg-meta span{background:#fff;border:1px solid var(--zg-border);border-radius:10px;padding:8px 12px;color:#596579;font-size:13px}
.zg-layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:34px;padding:48px 0 80px}
.zg-sidebar{
    position:sticky;top:100px;height:max-content;
    background:#fff;border:1px solid var(--zg-border);border-radius:var(--zg-radius);
    padding:20px;box-shadow:var(--zg-shadow)
}
.zg-sidebar-title{font-size:12px;text-transform:uppercase;letter-spacing:.08em;font-weight:850;color:#98a2b3;margin-bottom:12px}
.zg-toc{display:grid;gap:3px}
.zg-toc a{padding:8px 10px;border-radius:8px;text-decoration:none;font-size:13px;color:#596579}
.zg-toc a:hover{background:var(--zg-soft);color:var(--zg-primary)}
.zg-document{
    background:var(--zg-card);border:1px solid var(--zg-border);border-radius:var(--zg-radius);
    box-shadow:var(--zg-shadow);padding:clamp(28px,5vw,58px)
}
.zg-document h2{font-size:25px;line-height:1.3;letter-spacing:-.025em;margin:42px 0 14px;padding-top:10px;scroll-margin-top:100px}
.zg-document h2:first-child{margin-top:0}
.zg-document h3{font-size:18px;margin:27px 0 9px;scroll-margin-top:100px}
.zg-document p{margin:0 0 15px;color:#445066}
.zg-document ul,.zg-document ol{margin:8px 0 20px;padding-left:24px;color:#445066}
.zg-document li{margin:5px 0}
.zg-document strong{color:var(--zg-ink)}
.zg-callout{
    background:linear-gradient(135deg,#f2f7ff,#fff);
    border:1px solid #dce9ff;border-left:4px solid var(--zg-primary);
    padding:20px 22px;border-radius:12px;margin:22px 0;color:#445066
}
.zg-footer{background:#111827;color:#d7deea;padding:48px 0 28px}
.zg-footer-grid{display:flex;justify-content:space-between;gap:30px;align-items:flex-start}
.zg-footer .zg-brand{color:#fff}
.zg-footer p{max-width:500px;color:#9aa5b5;font-size:14px}
.zg-footer-links{display:flex;gap:22px;flex-wrap:wrap}
.zg-footer-links a{color:#d7deea;text-decoration:none;font-size:14px}
.zg-footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:28px;padding-top:20px;color:#8f9aaa;font-size:13px}
.zg-top{
    position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
    display:none;place-items:center;background:var(--zg-primary);color:#fff;text-decoration:none;
    box-shadow:0 12px 25px rgba(23,105,255,.3);font-weight:900
}
@media(max-width:900px){
    .zg-navlinks{display:none}
    .zg-layout{grid-template-columns:1fr}
    .zg-sidebar{position:relative;top:auto}
    .zg-toc{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:560px){
    .zg-container{width:min(var(--zg-max),calc(100% - 24px))}
    .zg-hero{padding:55px 0 45px}
    .zg-document{padding:24px 20px}
    .zg-toc{grid-template-columns:1fr}
    .zg-footer-grid{flex-direction:column}
    .zg-brand{font-size:22px}
}