.userbox{display: flex;border-radius: 8px;box-shadow: 0 4px 20px rgba(0,0,0,0.08);overflow: hidden;}
.uleft{width: 235px;padding:20px 0;background: #fff;border-right: 1px solid #f0f0f0;}
.uleft ul li a{display: block;line-height: 30px;padding:12px 20px;letter-spacing: 1px;color: #666;}
.uleft ul li a:hover{background: #f5f7fa;}
.uleft ul li a.on{background: #f0f7ff;color: #007bff;}
.uleft ul li a div{font-size:15px;border-left: 3px solid transparent;padding-left: 12px;}
.uleft ul li a.on div,.uleft ul li a:hover div{border-left:3px solid #007bff;}

.uright{flex: 1;padding: 25px;background: #fff;min-height: 60vh;}

.section-title{font-size: 18px;color: #333;font-weight: 600;padding-bottom: 15px;border-bottom: 1px solid #dde3ea;margin-bottom: 20px;}
.section-title-desc{font-size: 13px;color: #999;margin-bottom: 20px;display: none}

.form-group{margin-bottom: 20px;display: flex;align-items: center;}
.form-label{display: inline-block;width: 100px;text-align: right;padding-right: 15px;color: #666;font-size: 14px;line-height: 38px;}
.form-input{width: 300px;padding: 8px 12px;border: 1px solid #ddd;border-radius: 4px;font-size: 14px;color: #333;height: 38px;box-sizing: border-box;}
.form-input:focus{outline: none;border-color: #007bff;}
.form-textarea{width: 300px;height: 100px;padding: 8px 12px;border: 1px solid #ddd;border-radius: 4px;font-size: 14px;color: #333;resize: none;}
.form-textarea:focus{outline: none;border-color: #007bff;}
.form-tip{font-size: 12px;color: #999;margin-left: 135px;margin-top: 5px;}

.btn-save{display: inline-block;padding: 8px 30px;background: #007bff;color: #fff;border: none;border-radius: 4px;font-size: 14px;cursor: pointer;margin-left: 105px;}
.btn-save:hover{background: #0056b3;}
.btn-send-code{display: inline-block;padding: 8px 20px;background: #4a90e2;color: #fff;border: none;border-radius: 4px;font-size: 13px;cursor: pointer;margin-left: 8px;vertical-align: middle;}
.btn-send-code:hover{background: #357abd;}
.btn-send-code:disabled{background: #ccc;cursor: not-allowed;}

.tips-text{font-size: 13px;color: #999;line-height: 1.8;margin-bottom: 20px;padding: 15px;background: #f9f9f9;border-radius: 6px;}
.tips-text a{color: #007bff;text-decoration: none;}

.clearfix:after{content: '';display: table;clear: both;}
@media (max-width: 768px) {
    .userbox{flex-direction: column;}
    .uleft{width: 100%;border-right: none;border-bottom: 1px solid #f0f0f0;}
    .uright{min-height: auto;padding: 15px;}
    .form-input, .form-textarea{width: 100%;}
    .form-label{width: 80px;font-size: 13px;}
    .btn-save{margin-left: 0;width: 100%;}
}