.header {
            background-color: #f3f4f6;
        }
        .payment-alert {
            background: #e5e7eb;
            color: #111827;
            padding: 10px 16px;
            text-align: center;
            font-weight: 700;
            font-size: 0.92rem;
            line-height: 1.2;
        }
        .payment-alert a {
            color: #111827;
            text-decoration: underline;
            font-weight: 700;
        }
        .payment-alert i {
            font-size: 1.1rem;
            margin-right: 6px;
        }
        @media (max-width: 480px) {
            .payment-alert {
                font-size: 0.78rem;
                padding: 8px 12px;
            }
        }
        .premium-whatsapp-cta {
            position: fixed;
            right: 20px;
            bottom: 84px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 14px;
            border-radius: 999px;
            background: #25d366;
            color: #fff;
            font-weight: 700;
            text-decoration: none;
            box-shadow: 0 8px 20px rgba(37, 211, 102, 0.35);
            z-index: 9998;
        }
        .premium-whatsapp-cta:hover {
            filter: brightness(0.95);
        }
        @media (max-width: 520px) {
            .premium-whatsapp-cta {
                right: 12px;
                bottom: 136px;
            }
        }
        .payment-card {
            background: #ffffff;
            border: 1px solid #e5e7eb;
            border-radius: 12px;
            padding: 16px;
            margin-bottom: 18px;
            box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
        }
        .payment-card h4 {
            margin: 0 0 10px;
            color: var(--primary-color);
            font-size: 1rem;
            font-weight: 700;
        }
        .payment-proof-form {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .payment-proof-form input[type="file"] {
            padding: 8px;
            background: #f8fafc;
            border: 1px solid #e5e7eb;
            border-radius: 8px;
            font-size: 0.9rem;
        }
        .payment-proof-form button {
            align-self: flex-start;
            background: var(--primary-color);
            color: #fff;
            border: none;
            border-radius: 8px;
            padding: 8px 14px;
            font-weight: 700;
            cursor: pointer;
        }
        .payment-proof-form button:hover {
            filter: brightness(0.95);
        }
        .existing-payment-toggle {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 12px;
            font-weight: 600;
            cursor: pointer;
        }
        .existing-payment-panel {
            margin-top: 10px;
            display: none;
            gap: 8px;
        }
        .existing-payment-panel input {
            width: 100%;
            padding: 8px 10px;
            border-radius: 8px;
            border: 1px solid #e5e7eb;
            font-size: 0.9rem;
        }
        .existing-payment-panel button {
            background: #111827;
            color: #fff;
            border: none;
            border-radius: 8px;
            padding: 8px 14px;
            font-weight: 700;
            cursor: pointer;
        }
        .existing-payment-panel button:hover {
            filter: brightness(0.95);
        }
        .payment-result {
            font-size: 0.9rem;
            font-weight: 600;
        }
        .payment-result.success {
            color: #1f8b3a;
        }
        .payment-result.error {
            color: #c74340;
        }