.topbar{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.9);backdrop-filter:saturate(160%) blur(18px);border-bottom:1px solid rgba(0,0,0,.08)}.topbar-inner{max-width:var(--max);margin:auto;padding:13px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}