body {
    font-family: Arial, sans-serif;
    margin: 0;
    background-color: rgb(255,255,255);
}
header {
    background-color: #FF00FF;
    color: white;
    padding: 10px;
    text-align: center;
}
nav {
    display: flex;
    background-color: #00FFFF;
}
nav button {
    flex: 1;
    padding: 10px;
    border: none;
    cursor: pointer;
    background-color: #00FFFF;
}
nav button.active { background-color: #FF00FF; color:white; }
section { display: none; padding: 10px; }
section.active { display: block; }
input, select { padding: 5px; margin: 3px; }
table { width: 100%; border-collapse: collapse; margin-top: 10px; }
table, th, td { border: 1px solid black; }
th, td { padding: 5px; text-align: center; }
.btn { padding: 5px 10px; margin: 5px; cursor: pointer; }
.estado-rojo { background-color: #FF6666; color: white; }
.estado-amarillo { background-color: #FFEB99; }
.estado-verde { background-color: #99FF99; }
/* Modal */
.modal { display: none; position: fixed; z-index: 1; padding-top: 60px;
    left: 0; top: 0; width: 100%; height: 100%; overflow: auto;
    background-color: rgba(0,0,0,0.4);}
.modal-content { background-color: #fefefe; margin: auto; padding: 20px;
    border: 1px solid #888; width: 80%;}
.cerrar { color: #aaa; float: right; font-size: 28px; font-weight: bold;}
.cerrar:hover, .cerrar:focus { color: black; text-decoration: none; cursor: pointer;}