body,
        html {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            background-color: #0b0f19;
            overflow: hidden;
            touch-action: none;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            user-select: none;
            -webkit-user-select: none;
        }

        #gameCanvas {
            display: block;
            width: 100%;
            height: 100%;
            touch-action: none;
        }

        .overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            background: radial-gradient(circle at center, rgba(15, 23, 42, 0.7) 0%, rgba(11, 15, 25, 0.95) 100%);
            backdrop-filter: blur(6px);
            z-index: 10;
            transition: opacity 0.4s ease-in-out;
        }

        .hidden {
            opacity: 0;
            pointer-events: none;
        }

        @keyframes pulse-glow {

            0%,
            100% {
                text-shadow: 0 0 15px rgba(34, 211, 238, 0.5), 0 0 30px rgba(34, 211, 238, 0.3);
                transform: scale(1);
            }

            50% {
                text-shadow: 0 0 25px rgba(34, 211, 238, 0.8), 0 0 50px rgba(34, 211, 238, 0.5);
                transform: scale(1.02);
            }
        }

        .title-anim {
            animation: pulse-glow 3s infinite ease-in-out;
        }

        /* UI 네온 스타일 */
        .glass-panel {
            background: linear-gradient(135deg, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
            backdrop-filter: blur(8px);
        }

        .neon-text-cyan {
            text-shadow: 0 0 8px rgba(6, 182, 212, 0.8);
        }

        .neon-text-white {
            text-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
        }