/* 呼吸灯/阴影特效 */
        @keyframes shadow-pulse {
            0%, 100% { box-shadow: 0 0 15px rgba(59, 130, 246, 0.3); }
            50% { box-shadow: 0 0 30px rgba(59, 130, 246, 0.6); }
        }
        .breathing-shadow {
            animation: shadow-pulse 3s infinite;
        }