body { font-family: 'Inter', sans-serif; background-color: #f8fafc; }
        .breathing-shadow { animation: breathe 3s infinite alternate; }
        @keyframes breathe {
            0% { filter: drop-shadow(0 4px 6px rgba(59, 130, 246, 0.2)); }
            100% { filter: drop-shadow(0 15px 25px rgba(59, 130, 246, 0.5)); }
        }