body{font-family:Arial;padding:20px;background:#f5f5f5;}
table{width:100%;border-collapse:collapse;background:white;}
th,td{padding:10px;border-bottom:1px solid #ddd;}
th{background:#0077cc;color:white;}
button{padding:6px 10px;border:none;border-radius:4px;cursor:pointer;}
.btn-chat{background:#28a745;color:white;}
.btn-abrir{background:#17a2b8;color:white;}
.btn-cerrar{background:#dc3545;color:white;margin-left:5px;}
.logout-btn{float:right;background:#dc3545;color:white;
padding:8px 12px;border-radius:4px;text-decoration:none;font-weight:bold;}
.logout-btn:hover{background:#b52a37;}