.popup-alert {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}
.popup-content {
    background: #fff;
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0,0,0,0.2);
    text-align: center;
    position: relative;
    max-width: 300px;
    animation: fadeIn 0.3s ease;
    font-size: 16px;
    font-weight: bold;
}
.popup-content.error {
    color: #ff0000;
}
.popup-content.success {
    color: #28a745;
}
.close-btn {
    position: absolute;
    top: 5px;
    right: 15px;
    color: #333;
    font-size: 22px;
    cursor: pointer;
    font-weight: bold;
}
@keyframes fadeIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}