.site-header{position:sticky;top:0;z-index:999;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid #e2e8f0}.nav-wrap{height:78px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;font-size:24px;font-weight:900;color:#0f172a}.brand-mark{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#2563eb,#06b6d4);color:white}.navbar{display:flex;align-items:center;gap:22px}.nav-link{font-weight:700;color:#334155}.nav-link:hover,.nav-link.active{color:#2563eb}.menu-btn{display:none;background:transparent;border:0;cursor:pointer}.menu-btn span{display:block;width:28px;height:3px;background:#0f172a;margin:5px;border-radius:6px}