:root{--text:#172033;--muted:#667085;--border:#e6e9ef;--bg:#fff;--soft:#f7f8fa;--accent:#0f766e;--max:1180px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
a{color:inherit;text-decoration:none}
.container{width:min(100% - 32px,var(--max));margin:auto}
.site-header{border-bottom:1px solid var(--border);background:#fff;position:sticky;top:0;z-index:20}
.nav{height:70px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{font-size:22px;font-weight:800;color:var(--accent)}
.menu{display:flex;gap:20px;align-items:center}
.menu a{font-size:14px;color:#344054}
.menu a:hover{color:var(--accent)}
.hero{padding:70px 0;background:var(--soft)}
.hero h1{font-size:46px;line-height:1.15;margin:0 0 18px}
.hero p{max-width:760px;color:var(--muted);font-size:18px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.section{padding:56px 0}
.section h2{font-size:30px;margin:0 0 24px}
.card{border:1px solid var(--border);border-radius:14px;padding:24px;background:#fff}
.card h3{margin-top:0;font-size:20px}
.card p{color:var(--muted);margin-bottom:0}
.breadcrumb{padding:18px 0;color:var(--muted);font-size:14px}
.article{max-width:820px;padding:45px 0 70px}
.article h1{font-size:42px;line-height:1.2;margin:0 0 18px}
.article h2{font-size:28px;margin-top:42px}
.article h3{font-size:21px;margin-top:28px}
.article p,.article li{font-size:17px}
.article ul{padding-left:24px}
.note{padding:18px;border-left:4px solid var(--accent);background:var(--soft);margin:24px 0}
.site-footer{border-top:1px solid var(--border);background:#fff;padding:38px 0;margin-top:30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.footer-grid h3{margin-top:0}
.footer-grid p,.footer-grid a{color:var(--muted);font-size:14px}
.copy{border-top:1px solid var(--border);margin-top:28px;padding-top:18px;color:var(--muted);font-size:13px}
@media(max-width:800px){.menu{display:none}.hero{padding:50px 0}.hero h1,.article h1{font-size:34px}.grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.nav{height:62px}}