* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Arial', sans-serif;
        }
        
        body {
            background-color: #f5f7fa;
            padding: 20px;
            color: #333;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        h2 {
            text-align: center;
            margin-bottom: 20px;
            color: #1a5276;
            font-size: 24px;
        }
        
        .tabs {
            position: relative;
            margin: 0 auto 30px;
            width: 100%;
        }
        
        .tabs input[type="radio"] {
            position: absolute;
            opacity: 0;
        }
        
        .tabs label {
            display: inline-block;
            padding: 10px 15px;
            cursor: pointer;
            background-color: #e0e0e0;
            border-radius: 5px 5px 0 0;
            margin: 0 5px 0 0;
            transition: background-color 0.3s;
        }
        
        .tabs label:hover {
            background-color: #d0d0d0;
        }
        
        .tabs input[type="radio"]:checked + label {
            background-color: #2e86c1;
            color: white;
        }
        
        .container {
            display: none;
            padding: 20px;
            background-color: white;
            border-radius: 0 5px 5px 5px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            width: 100%;
        }
        
        #tab_1:checked ~ #txt_1,
        #tab_2:checked ~ #txt_2,
        #tab_3:checked ~ #txt_3,
        #tab_4:checked ~ #txt_4,
        #tab_5:checked ~ #txt_5,
        #tab_6:checked ~ #txt_6,
        #tab_7:checked ~ #txt_7,
        #tab_8:checked ~ #txt_8,
        #tab_9:checked ~ #txt_9,
        #tab_10:checked ~ #txt_10,
        #tab_11:checked ~ #txt_11,
        #tab_12:checked ~ #txt_12,
        #tab_13:checked ~ #txt_13,
        #tab_14:checked ~ #txt_14
 {
            display: block;
        }
        
        .row {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }
        
        .column {
            flex: 1;
            min-width: 300px;
            margin: 10px;
        }
        
        .centered-content {
            text-align: center;
        }
        
        .centered-list {
            list-style-type: none;
            padding: 0;
        }
        
        .button {
            display: block;
            padding: 12px 20px;
            margin: 8px 0;
            background-color: #2e86c1;
            color: white;
            text-decoration: none;
            border-radius: 4px;
            transition: background-color 0.3s;
            text-align: center;
        }
        
        .button:hover {
            background-color: #1c6ea4;
        }
        
        .full-width-button {
            width: 100%;
        }
        
        @media (max-width: 768px) {
            .tabs label {
                display: block;
                width: 100%;
                margin-bottom: 5px;
                border-radius: 5px;
            }
            
            .container {
                border-radius: 5px;
            }
            
            .row {
                flex-direction: column;
            }
        }