.register-message {
    background: linear-gradient(90deg, #28a745 60%, #218838 100%);
    color: #fff;
    border: 2px solid #218838;
    border-radius: 8px;
    padding: 14px 20px;
    margin-bottom: 18px;
    font-size: 1.15em;
    text-align: center;
    font-weight: bold;
    box-shadow: 0 2px 12px 0 rgba(40,167,69,0.15);
    display: none;
    animation: fadeIn 0.7s;
    letter-spacing: 1px;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px);}
    to { opacity: 1; transform: translateY(0);}
}