input[type="text"] {
            width: calc(100% - 28px);
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
            font-family: 'Courier New', monospace;
        }
        input[type="text"]:focus {
            outline: none;
            border-color: #007acc;
        }

        .subnet-result {
            background: #f8f9fa;
            border: 2px solid #e9ecef;
            border-radius: 6px;
            padding: 15px;
            position: relative;
        }
        .subnet-name {
            color: #007acc;
            font-weight: bold;
            margin-bottom: 10px;
            font-size: 14px;
            text-transform: uppercase;
        }
        .subnet-output {
            background: #1e1e1e;
            color: #d4d4d4;
            padding: 12px;
            border-radius: 4px;
            font-family: 'Courier New', monospace;
            word-break: break-all;
            min-height: 40px;
            white-space: pre-wrap;
        }

        .class-buttons {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }
        .class-btn {
            background: #007acc;
            color: white;
            border: none;
            padding: 8px 16px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 12px;
            transition: background-color 0.3s;
        }
        .class-btn:hover {
            background: #005a9e;
        }