*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Microsoft Yahei", sans-serif;
}
body{
    background:#f5f7fa;
    padding:20px;
}
.container{
    max-width:900px;
    margin:0 auto;
}
h1{
    text-align:center;
    margin-bottom:24px;
    color:#222;
}
.card{
    background:#fff;
    padding:18px;
    border-radius:8px;
    box-shadow:0 1px 4px #ddd;
    margin-bottom:16px;
}
h3{
    margin-bottom:12px;
    color:#333;
}
.row{
    margin:10px 0;
    display:flex;
    align-items:center;
    gap:8px;
}
label{
    width:90px;
}
input{
    flex:1;
    padding:8px 10px;
    border:1px solid #ccc;
    border-radius:4px;
}
button{
    padding:9px 16px;
    border:none;
    border-radius:4px;
    background:#2563eb;
    color:#fff;
    cursor:pointer;
    margin:4px;
}
.btn-group{
    margin-top:8px;
}
#logArea{
    width:100%;
    height:160px;
    padding:10px;
    border:1px solid #ddd;
    resize:none;
}