body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

h1, h2 {
    color: #1a202c;
}

.section {
    margin-bottom: 20px;
    border-top: 1px solid #e2e8f0;
    padding-top: 20px;
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input[type="text"], select {
    width: 100%;
    padding: 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background-color: #4a90e2;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

button:hover {
    background-color: #357abd;
}

#responseOutput {
    background-color: #2d3748;
    color: #f7fafc;
    padding: 15px;
    border-radius: 4px;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.instance-list {
    margin-top: 15px;
}

.instance {
    background-color: #f9fafb;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    padding: 15px;
    margin-bottom: 10px;
}

.instance h3 {
    margin-top: 0;
}