body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    justify-content: center;
    padding: 20px;
    margin: 0;
}

.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 800px;
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
}

.control-panel {
    margin-bottom: 30px;
    padding: 20px;
    background-color: #ecf0f1;
    border-radius: 6px;
}

.form-group {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.form-group label {
    font-weight: bold;
    min-width: 100px;
}

input[type="text"], select {
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    flex-grow: 1;
}

button {
    padding: 8px 15px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

button:disabled {
    background-color: #95a5a6;
    cursor: not-allowed;
}

.display-panel {
    border: 1px solid #ddd;
    padding: 20px;
    border-radius: 6px;
    background-color: #fafafa;
    min-height: 200px;
}

.display-panel h2 {
    margin-top: 0;
    font-size: 1.2em;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

pre#dataDisplay {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'Consolas', 'Monaco', monospace;
    background-color: #2c3e50;
    color: #2ecc71;
    padding: 15px;
    border-radius: 4px;
    height: 300px;
    overflow-y: auto;
}

.mock-group {
    border-top: 1px dashed #ccc;
    padding-top: 15px;
    margin-top: 15px;
}

.input-row {
    display: flex;
    gap: 10px;
    width: 100%;
}

.baud-rate-group {
    display: flex;
    align-items: center;
    gap: 5px;
}