/* Success Popup Styles */
        .success-popup {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0.9);
            background: white;
            padding: 32px;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
            text-align: center;
            z-index: 9999;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            width: 90%;
            max-width: 400px;
        }

        .success-popup.active {
            opacity: 1;
            visibility: visible;
            transform: translate(-50%, -50%) scale(1);
        }

        .success-icon {
            width: 64px;
            height: 64px;
            background: #22c55e;
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 32px;
            margin: 0 auto 16px;
        }

        .success-popup h3 {
            margin: 0 0 8px 0;
            color: #1e293b;
        }

        .success-popup p {
            margin: 0;
            color: #64748b;
        }

        .popup-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            backdrop-filter: blur(4px);
            z-index: 9998;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }

        .popup-overlay.active {
            opacity: 1;
            visibility: visible;
        }

        /* Error variation */
        .success-popup.error .success-icon {
            background: #ef4444;
        }

        .close-x {
            position: absolute;
            top: 16px;
            right: 16px;
            font-size: 20px;
            color: #94a3b8;
            cursor: pointer;
            transition: color 0.2s;
            border: none;
            background: none;
            padding: 4px;
        }

        .close-x:hover {
            color: #475569;
        }