@import url('https://fonts.googleapis.com/css2?family=Pretendard:wght@400;600;700&display=swap');

        .div-container {
            display: flex;
            justify-content: center;
            align-items: center;
        }

            .div-inner {
        margin-left: auto;
        margin-right: auto;
            background: #2c3e50;
            border: 4px solid #3f8fef;
        padding: 30px;
        border-radius: 12px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        width: 100%;
        max-width: 800px;
        text-align: center;
    }

        .custom-scrollbar::-webkit-scrollbar { width: 6px; }
        .custom-scrollbar::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.05); }
        .custom-scrollbar::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.2); border-radius: 10px; }

        .active-track {
            background-color: rgba(16, 185, 129, 0.15);
            border-left: 4px solid #10b981;
        }

        /* 1:1 비율 컨테이너 */
        #media-display-container {
            position: relative;
            width: 100%;
            aspect-ratio: 1 / 1;
            max-width: 400px;
            margin: 0 auto;
            background: #000;
            border-radius: 1.5rem;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }

        video {
            width: 100%;
            height: 100%;
            object-fit: contain; /* 1:1 영상 잘림 방지 */
            z-index: 5;
        }

        canvas {
            width: 100%;
            height: 100%;
            position: absolute;
            top: 0;
            left: 0;
            pointer-events: none;
            z-index: 2;
            transition: opacity 0.3s ease;
        }

        .modal {
            display: none;
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: rgba(0, 0, 0, 0.9);
            backdrop-filter: blur(12px);
            z-index: 100;
            align-items: center;
            justify-content: center;
        }
        .modal.active { display: flex; }

        .loader {
            border: 2px solid rgba(255, 255, 255, 0.1);
            border-top: 2px solid #10b981;
            border-radius: 50%;
            width: 16px; height: 16px;
            animation: spin 1s linear infinite;
            display: none;
        }
        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }