body::before { content: ''; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.8); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); opacity: 0; pointer-events: none; transition: opacity 0.3s ease; z-index: 98; } body:has(.open)::before { opacity: 1; pointer-events: all; }