.site-header{position:fixed;top:0;left:0;right:0;z-index:1000;padding:14px 0;transition:all var(--transition-base)}.site-header.scrolled{background:#0a0e1af2;backdrop-filter:blur(16px);padding:8px 0;border-bottom:1px solid var(--color-border)}.header-inner{max-width:var(--container-width);margin:0 auto;padding:var(--container-padding);display:flex;align-items:center;justify-content:space-between}.logo-img{height:44px;width:auto;display:block}.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:1.4rem;font-weight:800;letter-spacing:-.01em}.logo-icon{width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));display:flex;align-items:center;justify-content:center;font-size:.65rem;font-weight:700;color:var(--color-bg-dark);letter-spacing:0}.logo-text-legacy{color:var(--color-text-bright)}.logo-text-iot{color:var(--color-primary)}.logo-tagline{font-size:.55rem;font-weight:400;letter-spacing:.12em;text-transform:uppercase;color:var(--color-text-muted);display:block;margin-top:-2px}.main-nav{flex:1;display:flex;justify-content:center}.nav-list{display:flex;align-items:center;gap:4px}.nav-item>a{display:flex;align-items:center;gap:5px;padding:8px 14px;font-size:.88rem;font-weight:500;color:var(--color-text-muted);border-radius:var(--radius-sm);transition:all var(--transition-fast)}.nav-item>a:hover{color:var(--color-primary);background:#00c8ff0f}.nav-item.has-dropdown{position:relative}.dropdown{position:absolute;top:100%;left:0;min-width:260px;background:var(--color-bg-dark-2);border:1px solid var(--color-border);border-radius:var(--radius-md);box-shadow:var(--shadow-card);padding:10px;opacity:0;visibility:hidden;transform:translateY(8px);transition:all var(--transition-base)}.nav-item.has-dropdown:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}.dropdown a{display:block;padding:10px 14px;font-size:.88rem;color:var(--color-text-muted);border-radius:var(--radius-sm);transition:all var(--transition-fast)}.dropdown a:hover{background:#00c8ff14;color:var(--color-primary)}.header-actions{display:flex;align-items:center;gap:12px}.header-actions .btn-primary{padding:9px 22px;font-size:.85rem}.btn-login{font-size:.85rem;font-weight:500;color:var(--color-text-muted);padding:8px 12px}.btn-login:hover{color:var(--color-primary)}.mobile-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px;z-index:1001}.mobile-toggle span{display:block;width:24px;height:2px;background:var(--color-text-bright);border-radius:2px;transition:all var(--transition-base)}.mobile-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.mobile-toggle.active span:nth-child(2){opacity:0}.mobile-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}