body {
      font-family: Arial, sans-serif;
      background: #f4f6f8;
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100vh;
    }

    .login-box {
      background: white;
      padding: 40px;
      border-radius: 12px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
      text-align: center;
      width: 300px;
    }

    .logo {
      width: 100px;
      margin-bottom: 10px;
    }

    input {
      width: 100%;
      padding: 10px;
      margin: 8px 0;
      border-radius: 6px;
      border: 1px solid #ccc;
    }

    button {
      width: 100%;
      padding: 10px;
      background: #0082c9;
      color: white;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      font-weight: bold;
      transition: background 0.2s;
    }

    button:hover {
      background: #006da8;
    }

    .error-message {
      display: none;
      color: #721c24;
      background: #f8d7da;
      border: 1px solid #f5c6cb;
      padding: 8px 12px;
      border-radius: 6px;
      margin-bottom: 12px;
      text-align: center;
      opacity: 0;
      transition: opacity 0.4s ease;
    }

    .error-message.show {
      display: block;
      opacity: 1;
    }

    .fade-out {
      opacity: 0;
      transition: opacity 0.6s ease;
    }