/* 呼吸灯/阴影特效 */
        @keyframes breathe {
            0%, 100% { transform: scale(1); filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1)); }
            50% { transform: scale(1.02); filter: drop-shadow(0 20px 25px rgba(37, 99, 235, 0.2)); }
        }
        .breathe-effect {
            animation: breathe 4s ease-in-out infinite;
        }