.site-header{position:fixed;inset:0 0 auto;z-index:100;padding:18px 0;transition:padding .25s}.site-header.is-scrolled{padding:9px 0}.nav-shell{display:flex;align-items:center;min-height:66px;padding:8px 10px 8px 20px;border:1px solid var(--dark-border);border-radius:12px;background:rgba(2,8,23,.76);backdrop-filter:blur(18px) saturate(140%);box-shadow:0 10px 35px rgba(0,0,0,.14)}.brand{display:flex;align-items:center;gap:10px;color:#fff}.brand-mark{width:38px;height:38px;color:var(--blue-light)}.brand span{display:flex;flex-direction:column}.brand strong{font-size:1.08rem;line-height:1.1;letter-spacing:.06em}.brand small{margin-top:3px;color:rgba(255,255,255,.57);font-size:.54rem}.main-nav{display:flex;align-items:center;gap:30px;margin-left:auto;margin-right:32px}.main-nav a{position:relative;color:rgba(255,255,255,.8);font-size:.86rem}.main-nav a:hover,.main-nav a[aria-current=page]{color:#fff}.main-nav a[aria-current=page]::after{content:"";position:absolute;top:calc(100% + 18px);left:0;width:100%;height:2px;background:var(--blue)}.nav-cta{min-height:44px;padding:9px 20px;font-size:.8rem}.menu-toggle{display:none;width:44px;height:44px;border:0;background:transparent}.menu-toggle span{display:block;width:24px;height:2px;margin:5px auto;background:#fff;transition:.2s}