/* Единое меню сайта: неоновые плашки. Активный раздел светится ярче. */
.site-nav{position:sticky;top:0;z-index:120;
  background:rgba(11,18,32,.9);backdrop-filter:blur(10px);
  border-bottom:1px solid #243044}
.site-nav .sn-in{max-width:1140px;margin:0 auto;padding:10px 20px;
  display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.site-nav .sn-brand{display:flex;align-items:center;gap:9px;text-decoration:none;
  color:#e6ecf5;font-weight:800;font-size:14px;margin-right:6px}
.site-nav .sn-brand img{width:30px;height:30px;border-radius:7px}
.site-nav .sn-links{display:flex;align-items:center;gap:6px;flex-wrap:wrap;flex:1 1 auto}
.site-nav .sn-a{display:inline-flex;align-items:center;padding:7px 13px;border-radius:9px;
  text-decoration:none;font-size:13px;font-weight:600;color:#8b9bb4;
  background:#131c2e;border:1px solid #243044;
  transition:color .16s,border-color .16s,box-shadow .16s,background .16s}
.site-nav .sn-a:hover{color:#cfe0ff;border-color:rgba(79,140,255,.55);
  box-shadow:0 0 10px rgba(79,140,255,.35)}
/* Активный раздел: яркая неоновая рамка и свечение. */
.site-nav .sn-a.on{color:#eaf2ff;border-color:rgba(79,140,255,.9);
  background:linear-gradient(160deg,rgba(79,140,255,.26),rgba(79,140,255,.08));
  box-shadow:0 0 0 1px rgba(79,140,255,.5),0 0 16px rgba(79,140,255,.55),inset 0 0 12px rgba(79,140,255,.22)}
.site-nav .sn-right{display:flex;align-items:center;gap:8px;margin-left:auto}
.site-nav .sn-go{padding:8px 16px;border-radius:9px;text-decoration:none;font-size:13px;
  font-weight:800;color:#fff;background:#4f8cff;
  box-shadow:0 0 0 1px rgba(79,140,255,.6),0 0 18px rgba(79,140,255,.5)}
.site-nav .sn-go:hover{background:#6a9dff;box-shadow:0 0 0 1px rgba(79,140,255,.8),0 0 24px rgba(79,140,255,.7)}
@media(max-width:720px){
  .site-nav .sn-in{padding:8px 12px;gap:8px}
  .site-nav .sn-brand span{display:none}
  .site-nav .sn-a{padding:6px 10px;font-size:12px}
}