* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
body {
    max-width: 1000px;
    margin: 50px auto;
    padding: 0 20px;
    background-color: #f5f5f5;
}
.container {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
h1 {
    text-align: center;
    margin-bottom: 25px;
    color: #333;
    font-size: 24px;
}
textarea {
    width: 100%;
    height: 400px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    resize: vertical;
    font-family: "Consolas", "Monaco", monospace;
    font-size: 14px;
    color: #333;
    line-height: 1.6;
    outline: none;
}
textarea::placeholder {
    color: #999;
}
button {
    display: block;
    width: 100%;
    height: 50px;
    margin-top: 20px;
    background-color: #2f5496;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}
button:hover {
    background-color: #23468c;
}
/* 响应式适配 */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    textarea {
        height: 300px;
    }
}