* {
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
    background-color: #eef2f7;
    margin: 0;
    padding: 20px;
}
.container {
    display: flex;
    flex-wrap: wrap;
    max-width: 800px;
    margin: 0 auto;
}
.panel {
    flex: 1 1 45%;
    margin: 10px;
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
}
h2, h3 {
    color: #34495e;
    margin-bottom: 20px;
}
label {
    display: block;
    margin-top: 10px;
    font-weight: bold;
    color: #34495e;
}
input[type="text"],
textarea {
    width: 100%;
    max-width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
    resize: vertical;
    font-size: 14px;
}
textarea {
    height: 150px;
}
.checkbox-label {
    margin-top: 10px;
    color: #34495e;
}
.checkbox-label input {
    margin-right: 5px;
}
button {
    background-color: #3498db;
    color: white;
    padding: 12px;
    margin-top: 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    font-size: 16px;
}
button:hover {
    background-color: #2980b9;
}
#result {
    background-color: #f7f9fb;
    margin-top: 10px;
    height: 200px;
    width: 100%;
    max-width: 100%;
}
.copy-button {
    background-color: #2ecc71;
    margin-top: 10px;
}
.copy-button:hover {
    background-color: #27ae60;
}
.count {
    font-size: 16px;
    color: #34495e;
    margin-top: 20px;
}
@media (max-width: 800px) {
    .container {
        flex-direction: column;
    }
    .panel {
        flex: 1 1 100%;
    }
}