body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            background-color: #f5f7fa;
            color: #333;
        }
       .nav-center {
            display: flex;
            justify-content: center;
            padding: 1rem 0;
            background-color: #f8f9fa;
            border-bottom: 1px solid #dee2e6;
        }
        .page-header {
            text-align: center;
            margin: 2rem 0;
            padding-bottom: 1rem;
            border-bottom: 2px solid #0d6efd;
        }
        header {
            text-align: center;
            margin-bottom: 30px;
        }
        h1 {
            color: #2c3e50;
            margin-bottom: 10px;
        }
        .tagline {
            color: #7f8c8d;
            font-size: 18px;
        }
        .shortener-box {
            background: white;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            padding: 30px;
            margin-bottom: 30px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        input[type="url"] {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            box-sizing: border-box;
        }
        button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            width: 100%;
            transition: background-color 0.3s;
        }
        button:hover {
            background-color: #2980b9;
        }
        .result {
            margin-top: 20px;
            padding: 15px;
            border-radius: 4px;
            background-color: #f8f9fa;
            border-left: 4px solid #3498db;
        }
        .error {
            color: #e74c3c;
            border-left-color: #e74c3c;
        }
        .features {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            margin-top: 40px;
        }
        .feature {
            flex-basis: 30%;
            text-align: center;
            margin-bottom: 20px;
        }
        footer {
            text-align: center;
            margin-top: 50px;
            color: #7f8c8d;
            font-size: 14px;
        }
        #urlHistory {
            margin-top: 30px;
        }
        #historyTable {
            width: 100%;
            border-collapse: collapse;
            margin-top: 10px;
        }
        #historyTable th, #historyTable td {
            padding: 8px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }
        #historyTable th {
            background-color: #f2f2f2;
        }
        .text-truncate {
            max-width: 200px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            display: inline-block;
        }
        @media (max-width: 600px) {
            .feature {
                flex-basis: 100%;
            }
            .text-truncate {
                max-width: 120px;
            }
        }
        input[type="text"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}