* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  }
  
  body {
    min-height: 100vh;
    background: #f5f7fa;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .login-container {
    width: 100%;
    padding: 0 20px;
  }
  
  .login-card {
    max-width: 420px;
    margin: 0 auto;
    background: #fff;
    border-radius: 12px;
    padding: 45px 35px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  }
  
  .login-card h2 {
    text-align: center;
    font-size: 26px;
    color: #333;
    margin-bottom: 8px;
  }
  
  .sub-title {
    text-align: center;
    color: #666;
    font-size: 14px;
    margin-bottom: 35px;
  }
  
  .form-item {
    margin-bottom: 22px;
  }
  
  .form-item label {
    display: block;
    font-size: 14px;
    color: #333;
    margin-bottom: 8px;
  }
  
  .form-item input {
    width: 100%;
    height: 46px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 0 15px;
    font-size: 15px;
    outline: none;
  }
  
  .form-item input:focus {
    border-color: #409eff;
  }
  
  #loginBtn {
    width: 100%;
    height: 48px;
    background: #409eff;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
  }
  
  #loginBtn:hover {
    background: #338eef;
  }
  
  .msg {
    text-align: center;
    margin-top: 18px;
    font-size: 14px;
    color: #f53f3f;
    min-height: 18px;
  }