.modal-backdrop {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}
.modal-contenido {
    background: white;
    padding: 20px;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 0 15px rgba(0,0,0,0.3);
}
.modal-contenido label {
    display: block;
    margin-top: 10px;
}
.modal-contenido input,
.modal-contenido textarea {
    width: 100%;
    margin-bottom: 10px;
}