/* CSS Tambahan Alert */
        .card {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 999;
            display: none;
            flex-direction: column;
            gap: 1rem;
            padding: 1.5rem;
            width: 19rem;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: 12px;
            box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.2);
            text-align: center;
            color: #fff;
            animation: fadeIn 0.4s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translate(-50%, -45%); }
            to { opacity: 1; transform: translate(-50%, -50%); }
        }

        .card .card_title {
            font-size: 1.5rem;
            font-weight: bold;
        }

        .card .card_paragraph {
            font-size: 0.95rem;
            color: #ddd;
        }

        .close-btn {
            position: absolute;
            top: 10px;
            right: 10px;
            color: #fff;
            font-size: 1.5rem;
            cursor: pointer;
        }

        /* Overlay Background */
        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
        }