body {
            font-family: 'Tahoma', sans-serif;
            padding: 20px;
            background-color: #f4f4f4;
        }
        .container {
            max-width: 1200px;
            margin: auto;
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
        }
        table.dataTable thead th, table.dataTable thead td {
            text-align: right; /* راست‌چین کردن هدر جدول */
        }
        #phonebookTable_filter {
            margin-bottom: 20px;
        }
        #phonebookTable_filter label {
            font-weight: bold;
        }
        #phonebookTable_filter input {
            margin-right: 5px;
            border-radius: 5px;
            border: 1px solid #ccc;
            padding: 5px;
        }