*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background: #f5f7fa;
    font-family: "微软雅黑";
}
.container{
    width: 420px;
    margin: 80px auto;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 0 15px #ddd;
}
h2{
    text-align: center;
    margin-bottom: 25px;
    color: #333;
}
.item{
    margin: 18px 0;
}
label{
    display: block;
    margin-bottom: 6px;
    color: #555;
}
input{
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 16px;
}
button{
    width: 100%;
    padding: 12px;
    background: #2385ff;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
}
#result{
    margin-top: 20px;
    line-height: 1.8;
    font-size: 15px;
}