.site-header{background:var(--bg-secondary);border-bottom:1px solid var(--border-primary);position:-webkit-sticky;position:sticky;top:0;z-index:100}.header-content{max-width:1200px;margin:0 auto;padding:var(--space-md) var(--space-xl);display:flex;justify-content:space-between;align-items:center}.logo a{font-size:var(--font-size-xl);font-weight:bold;color:var(--accent-primary);text-decoration:none;font-family:var(--font-header)}.nav-actions{display:flex;align-items:center;gap:var(--space-md)}.nav-links{display:flex;align-items:center;gap:var(--space-lg);margin-right:var(--space-md)}.nav-link{color:var(--text-secondary);text-decoration:none;padding:var(--space-sm) var(--space-md);border-radius:var(--radius-sm);font-weight:500;transition:all .2s ease}.nav-link:hover{color:var(--accent-primary);background:var(--bg-tertiary)}.user-menu{display:flex;align-items:center;gap:var(--space-md)}.user-profile{display:flex;align-items:center;gap:var(--space-sm);text-decoration:none;color:var(--text-secondary);padding:var(--space-sm);border-radius:var(--radius-sm);transition:all .2s ease}.user-profile:hover{color:var(--text-primary);background:var(--bg-tertiary)}.profile-image{width:32px;height:32px;border-radius:var(--radius-sm);object-fit:cover;border:1px solid var(--border-primary)}.profile-sketch-avatar{width:32px;height:32px;border-radius:var(--radius-sm);overflow:hidden;border:1px solid var(--border-primary);display:flex;align-items:center;justify-content:center}.profile-sketch-avatar svg{width:100%;height:100%;object-fit:cover}.profile-default-avatar{width:32px;height:32px;background:var(--accent-primary);color:#fff;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;font-weight:bold;font-size:14px}.settings-link{color:var(--text-secondary);padding:var(--space-sm);border-radius:var(--radius-sm);transition:all .2s ease;display:flex;align-items:center;justify-content:center}.settings-link:hover{color:var(--accent-primary);background:var(--bg-tertiary)}.loading-auth{color:var(--text-muted);font-size:var(--font-size-sm)}@media(max-width: 768px){.header-content{padding:var(--space-sm) var(--space-md);flex-wrap:wrap;gap:var(--space-sm)}.nav-links{display:none}.user-menu{gap:var(--space-sm)}}.loading-auth-skeleton{display:flex;align-items:center;gap:var(--space-md)}.skeleton{background:var(--bg-tertiary);border-radius:var(--radius-sm);animation:skeleton-pulse 1.5s ease-in-out infinite}.skeleton-avatar{width:32px;height:32px}.skeleton-username{width:100px;height:14px}.skeleton-button{width:80px;height:32px}@keyframes skeleton-pulse{0%{opacity:1}50%{opacity:.4}100%{opacity:1}}


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