/* Demo 1 专属样式 */
body {
    background: #f0fdf4; /* 浅绿色背景，与其他 Demo 区分 */
    padding: 40px;
    font-family: sans-serif;
}
.demo1-card {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    max-width: 600px;
    margin: 0 auto;
}
.btn {
    background: #22c55e;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}
.btn:hover { background: #16a34a; }
#result-box {
    margin-top: 20px;
    padding: 15px;
    background: #1e293b;
    color: #38bdf8;
    border-radius: 5px;
    min-height: 50px;
    white-space: pre-wrap;
}