/* 둥둥 떠다니는 빛 번짐(플로팅 글로우) 애니메이션 */
    @keyframes aurora1 {
        0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.2; }      /* 강도조절 opacity 0.4 -> 0.2 */
        33% { transform: translate(30px, -50px) scale(1.1); opacity: 0.6; }
        66% { transform: translate(-20px, 20px) scale(0.9); opacity: 0.2; }  /* 강도조절 opacity 0.4 -> 0.2 */
    }
    @keyframes aurora2 {
        0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.3; }
        33% { transform: translate(-50px, 30px) scale(1.2); opacity: 0.5; }
        66% { transform: translate(20px, -20px) scale(0.8); opacity: 0.3; }
    }
    @keyframes aurora3 {
        0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.4; }
        33% { transform: translate(40px, 40px) scale(0.9); opacity: 0.6; }
        66% { transform: translate(-30px, -40px) scale(1.1); opacity: 0.4; }
    }
    .glow-1 { animation: aurora1 15s infinite ease-in-out; }
    .glow-2 { animation: aurora2 18s infinite ease-in-out reverse; }
    .glow-3 { animation: aurora3 20s infinite ease-in-out; }