.toast {
    position: fixed;
    top: 20px;
    right: -400px;
    min-width: 250px;
    padding: 16px 20px;
    color: white;
    font-weight: 600;
    border-radius: 8px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    transition: right 0.5s ease;
    z-index: 9999;
}

.toast.show {
    right: 20px;
}

.toast.success { background: #22c55e; } /* vert */
.toast.error { background: #ef4444; }   /* rouge */