.payment-card-container {
            background: #fff;
            border-radius: 8px;
            padding: 20px;
            box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
            margin-bottom: 20px;
        }

        .donation-selector {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .donation-option {
            flex: 1;
            border: 2px solid #ccc;
            padding: 15px;
            text-align: center;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.2s ease;
            user-select: none;
            border-radius: 8px;
            background: #f9f9f9;
        }

        .donation-option.active {
            background: #0d6efd;
            color: white;
            border-color: #0d6efd;
        }

        .donation-option:hover {
            border-color: #0d6efd;
            background: #e9ecef;
        }

        #amount-field {
            font-size: 35px;
            width: 55%;
            font-weight: bold;
            text-align: center;
            margin: 20px 0;
            border: 2px solid #0d6efd;
            border-radius: 8px;
            padding: 10px;
        }

        .invalid-feedback {
            color: #dc3545;
            font-size: 0.875em;
            margin-top: 5px;
            display: none;
        }

        .invalid-feedback.show {
            display: block;
        }

        .form-control.error {
            border-color: #dc3545;
        }

        .rscs-btnsend {
            background-color: #f3ae34;
            color: white;
            border: none;
            padding: 12px 24px;
            font-size: 18px;
            border-radius: 30px;
            cursor: pointer;
            transition: background 0.3s;
        }

        .rscs-btnsend:hover {
            background-color: #e09d1e;
        }

        .row {
            margin-bottom: 15px;
        }

        .fw-col-xs-12,
        .fw-col-sm-4,
        .fw-col-sm-6,
        .fw-col-sm-8,
        .fw-col-sm-12 {
            padding: 0 10px;
            margin-bottom: 15px;
        }

        .form-group label {
            font-weight: 600;
            margin-bottom: 5px;
            display: block;
        }

        .form-control {
            width: 100%;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 4px;
        }

        .rscsPPP {
            display: none;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
            z-index: 10000;
            text-align: center;
        }

        .rscsPPP-title {
            font-size: 20px;
            font-weight: bold;
            margin-bottom: 10px;
        }

        .rscsPPP-btns button {
            margin: 10px;
            padding: 8px 16px;
            cursor: pointer;
        }

        .alert {
            padding: 10px;
            border-radius: 4px;
            margin-bottom: 10px;
        }

        .alert-error {
            background-color: #f8d7da;
            color: #721c24;
            border: 1px solid #f5c6cb;
        }

        .hidden {
            display: none;
        }