.header-scrolled{background:rgba(15,23,42,.95);box-shadow:0 8px 32px rgba(0,0,0,.3)}.mobile-nav.active{right:0}.tab-button:hover:not(.active){border-color:var(--accent-red);color:var(--accent-red);transform:translateY(-1px)}.fade-in-on-scroll.visible{opacity:1;transform:translateY(0)}.loading-spinner{display:inline-block;width:20px;height:20px;border:2px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:var(--text-light);animation:spin 1s linear infinite}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.no-scroll{overflow:hidden}