/* Trigger Button */
        .open-btn {
            background-color: #ffffff;
            color: #764ba2;
            font-size: 16px;
            font-weight: 600;
            padding: 1px 1px;
            border: none;
            border-radius: 30px;
            cursor: pointer;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .open-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 25px rgba(0, 0, 0, 0.2);
        }

        /* Pop-up Overlay (Background Blur) */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            backdrop-filter: blur(8px); /* Modern blur effect */
            display: flex;
            justify-content: center;
            align-items: center;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.4s ease;
            z-index: 1000;
        }

        /* Active State for Overlay */
        .overlay.active {
            opacity: 1;
            pointer-events: auto;
        }

        /* Pop-up Card Box */
        .popup-box {
            background: #ffffff;
            padding: 10px;
            border-radius: 24px;
            max-width: 580px;
            width: 90%;
            text-align: center;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            
            /* Entry Animation */
            transform: scale(0.7);
            transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
        }

        /* Active State for Card Box Animation */
        .overlay.active .popup-box {
            transform: scale(1);
        }

        /* Icon Wrapper */
        .popup-icon {
            width: 70px;
            height: 70px;
            background: #eef2ff;
            color: #4f46e5;
            font-size: 32px;
            line-height: 70px;
            border-radius: 50%;
            margin: 0 auto 24px;
        }

        /* Typography */
        .popup-box h2 {
            color: #1f2937;
            font-size: 24px;
            margin-bottom: 12px;
            font-weight: 700;
        }

        .popup-box p {
            color: #6b7280;
            font-size: 15px;
            line-height: 1.6;
            margin-bottom: 32px;
        }

        /* Action Buttons */
        .button-group {
            display: flex;
            gap: 12px;
        }

        .btn {
            flex: 1;
            padding: 12px 20px;
            font-size: 15px;
            font-weight: 600;
            border-radius: 12px;
            border: none;
            cursor: pointer;
            transition: background 0.2s;
        }

        .btn-secondary {
            background-color: #f3f4f6;
            color: #4b5563;
        }

        .btn-secondary:hover {
            background-color: #e5e7eb;
        }

        .btn-primary {
            background-color: #4f46e5;
            color: #ffffff;
        }

        .btn-primary:hover {
            background-color: #4338ca;
        }