.topbar{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:saturate(140%) blur(18px);border-bottom:1px solid var(--line)}
    .topbar-inner{max-width:var(--max);margin:auto;min-height:48px;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}