.header{position:fixed;top:0;left:0;width:100%;z-index:1000;padding:1.5rem 0;transition:all var(--transition-medium)}.header.scrolled{background-color:rgba(15,41,69,.95);padding:1rem 0;box-shadow:var(--shadow-md)}.header-container{display:flex;justify-content:space-between;align-items:center}.logo{z-index:1001}.logo-img{height:40px;transition:height var(--transition-medium);filter:brightness(0) invert(1)}.header.scrolled .logo-img{height:30px}.main-nav ul{display:flex;gap:var(--spacing-md)}.nav-link{color:var(--white);font-weight:500;padding:.5rem 0;position:relative}.nav-link:after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background-color:var(--gold);transition:width var(--transition-medium)}.nav-link.active:after,.nav-link:hover:after{width:100%}.btn-contact{background-color:var(--gold);color:var(--navy-dark);padding:.5rem 1rem;border-radius:var(--border-radius-sm)}.btn-contact:hover{background-color:var(--gold-dark);color:var(--white)}.menu-toggle{display:none;flex-direction:column;justify-content:space-between;width:30px;height:21px;cursor:pointer;z-index:1001}.menu-toggle span{display:block;width:100%;height:3px;background-color:var(--white);transition:all var(--transition-fast)}