.site-header{background:rgba(255,255,255,.95);border-bottom:1px solid var(--border-light);padding:var(--spacing-md) 0;position:-webkit-sticky;position:sticky;top:0;z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-content{display:flex;align-items:center;justify-content:space-between}.site-logo{transition:transform var(--transition-fast)}.site-logo:hover{transform:scale(1.05)}.site-nav{display:flex;align-items:center;gap:var(--spacing-lg)}.avatar{width:32px;height:32px;border-radius:var(--radius-full);border:2px solid var(--border-light)}.nav-link{color:var(--text-secondary);text-decoration:none;font-weight:600;font-size:.9375rem;padding:var(--spacing-sm) var(--spacing-md);border-radius:var(--radius-md);transition:all var(--transition-fast)}.nav-link:hover{color:var(--rainbow-indigo);background:var(--bg-secondary)}