:root{--fd-primary:21 57% 43%;--fd-primary-foreground:0 0% 100%}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:50;background:hsl(var(--fd-background)/.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid hsl(var(--fd-border))}.topbar-inner{display:flex;align-items:center;gap:32px;max-width:1320px;margin:0 auto;padding:0 24px;height:56px}.brand{font-size:1rem;font-weight:700;color:hsl(var(--fd-foreground));text-decoration:none;letter-spacing:-.02em;flex-shrink:0}.topnav{display:flex;align-items:center;gap:4px;flex:1 1}.nav-link{padding:6px 12px;font-size:.88rem;color:hsl(var(--fd-muted-foreground));text-decoration:none;border-radius:6px;transition:color .16s ease,background .16s ease}.nav-link:hover{background:hsl(var(--fd-accent))}.nav-link-active,.nav-link:hover{color:hsl(var(--fd-foreground))}.topbar-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.lang-switch{padding:5px 12px;font-size:.82rem;font-weight:500;color:hsl(var(--fd-muted-foreground));text-decoration:none;border:1px solid hsl(var(--fd-border));border-radius:6px;transition:color .12s ease,border-color .12s ease}.lang-switch:hover{color:hsl(var(--fd-foreground))}.theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;color:hsl(var(--fd-muted-foreground));background:none;border:none;border-radius:6px;cursor:pointer;transition:color .12s ease,background .12s ease}.theme-toggle:hover{color:hsl(var(--fd-foreground));background:hsl(var(--fd-accent))}