.site-header{height:var(--header-height);position:sticky;top:0;z-index:100;background:rgba(7,11,18,.92);border-bottom:1px solid rgba(140,180,230,.1);backdrop-filter:blur(16px)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}.brand-mark{width:46px;height:auto}.brand-lockup{display:flex;flex-direction:column;justify-content:center;line-height:1}.brand-name{font-family:var(--font-heading);font-weight:700;font-size:1.12rem;letter-spacing:.16em;color:#d7e7f8}.brand-it{background:linear-gradient(90deg,#1a6fd4,#4db4ff 70%,#7ecfff);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.brand-sub{font-family:var(--font-heading);font-size:.52rem;letter-spacing:.46em;color:#7ea3c7;margin-top:5px;padding-left:1px}.primary-nav{display:flex;align-items:center;gap:clamp(15px,2.2vw,32px)}.nav-link{position:relative;color:#c5d4e4;font-family:var(--font-heading);font-size:.82rem;font-weight:600;letter-spacing:.08em;padding:28px 0;transition:color var(--transition-fast)}.nav-link:hover,.nav-link.active{color:var(--color-primary)}.nav-link.active:after{content:"";position:absolute;bottom:18px;left:0;width:100%;height:2px;background:var(--color-primary)}.header-actions{display:flex;align-items:center;gap:20px}.menu-toggle{display:none;background:none;border:0;padding:8px}.menu-toggle span{display:block;width:23px;height:2px;background:#fff;margin:5px;transition:transform var(--transition-fast),opacity var(--transition-fast)}