/* Reset básico */
*{margin:0;padding:0;box-sizing:border-box;font-family:Arial,Helvetica,sans-serif}

body{background:#f4f4f4;color:#333;padding:20px}
h1{margin-bottom:20px;text-align:center}

/* Tabla responsive */
.tabla-contenedor{overflow-x:auto}
table{width:100%;border-collapse:collapse;background:#fff;min-width:720px}
th,td{padding:8px 10px;text-align:left;border-bottom:1px solid #ddd;font-size:.9rem}
th{background:#0074d9;color:#fff}

/* Botones */
.btn{
  padding:6px 12px;border:none;border-radius:4px;cursor:pointer;font-size:.85rem;color:#fff;margin-right:5px
}
.btn-admin{background: #737373}
a.btn-admin{text-decoration: none}
.btn-nuevo{background:#28a745}
.btn-editar{background:#ffc107;color:#000}
.btn-eliminar{background:#dc3545}
.btn:disabled{background:#ccc;cursor:not-allowed}

@media(max-width:600px){
  th,td{font-size:.8rem;padding:6px}
  .btn{display:block;width:100%;margin:2px 0}
}

/* Checkbox centrado */
td input[type=checkbox]{transform:scale(1.2);margin:0 auto;display:block}