/* 保持原有样式 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: Arial, sans-serif;
    }
    body {
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
      background: linear-gradient(135deg, #f0f4f8 0%, #ffffff 100%);
      color: #333;
      overflow: hidden;
      position: relative;
    }
    .background-circle {
      position: absolute;
      border-radius: 50%;
      background-color: rgba(0, 123, 255, 0.1);
    }
    .circle1 {
      width: 300px;
      height: 300px;
      top: -50px;
      left: -50px;
    }
    .circle2 {
      width: 200px;
      height: 200px;
      bottom: 50px;
      right: 50px;
    }
    .login-container {
      background-color: #ffffff;
      width: 430px;
      padding: 40px;
      border-radius: 12px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      text-align: center;
      z-index: 1;
    }
    .login-container h2 {
      font-size: 1.6em;
      color: #3c8dbc;
      margin-bottom: 10px;
    }
    .login-container p {
      font-size: 0.9em;
      color: #3c8dbc;
      margin-bottom: 20px;
    }
    .login-container p a {
      color: #3c8dbc;
      text-decoration: none;
    }
    .form-group {
      margin-bottom: 20px;
      text-align: left;
    }
    .form-group label {
      font-size: 0.85em;
      color: #3c8dbc;
      display: block;
      margin-bottom: 5px;
    }
    .form-group input {
      width: 100%;
      padding: 10px;
      border: 1px solid #e0e0e0;
      border-radius: 5px;
      font-size: 1em;
      background-color: #f7f9fc;
    }
    .form-group input:focus {
      border-color: #3c8dbc;
      outline: none;
    }
    .login-btn {
      width: 100%;
      padding: 12px;
      font-size: 1em;
      color: #fff;
      background-color: #3c8dbc;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      transition: background-color 0.3s;
    }
    .login-btn:hover {
      background-color: #337ab7;
    }
    .footer {
      position: absolute;
      bottom: 10px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 0.85em;
      color: #888;
    }