.topbar{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid transparent;transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease)}.topbar.is-scrolled{border-bottom-color:var(--border);box-shadow:var(--shadow-xs)}.topbar-inner{height:var(--topbar-h);display:flex;align-items:center;gap:20px}.brand{display:inline-flex;align-items:center;gap:11px;flex-shrink:0;transition:opacity var(--dur) var(--ease)}.brand:hover{opacity:.82}.brand-mark{width:34px;height:34px;flex-shrink:0}.brand-mark svg,.brand-mark 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