.topbar{position:sticky;top:0;z-index:50;background:rgba(250,250,252,.84);backdrop-filter:saturate(180%) blur(22px);border-bottom:1px solid rgba(0,0,0,.08)}.nav{max-width:1240px;margin:auto;display:flex;align-items:center;gap:24px;padding:12px 24px}