body {
    font-family: 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

label {
    font-weight: bold;
    color: #555;
}

input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    width: 60px;
}

button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

.output {
    min-height: 200px;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 20px;
    background-color: #fafafa;
    line-height: 1.6;
}

.output p {
    margin: 0 0 15px 0;
    text-indent: 2em;
}

#copyBtn {
    display: block;
    margin: 20px auto 0;
    background-color: #2196F3;
}

#copyBtn:hover {
    background-color: #1976D2;
}