.panel {
      background: rgba(15, 15, 25, 0.95);
      padding: 40px;
      border-radius: 12px;
      box-shadow: 0 0 20px rgba(0,255,100,0.1);
      width: 100%;
      max-width: 500px;
    }
    .form-group {
      margin-bottom: 20px;
      position: relative;
    }
    label {
      display: block;
      margin-bottom: 8px;
      font-weight: bold;
    }
    input[type="text"], input[type="email"], input[type="password"] {
      width: 100%;
      padding: 10px;
      border: none;
      border-radius: 4px;
      background: #1a1a1a;
      color: #fff;
      font-size: 1em;
    }
    .led {
      position: absolute;
      right: 10px;
      top: 44px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background-color: red;
      box-shadow: 0 0 6px red;
    }
    .led.green {
      background-color: #00ff00;
      box-shadow: 0 0 8px #00ff00;
    }
    button {
      width: 100%;
      padding: 12px;
      font-size: 1em;
      background: linear-gradient(90deg, #0ff, #0f0);
      color: #000;
      border: none;
      border-radius: 6px;
      font-weight: bold;
      cursor: pointer;
    }
    .error {
      color: red;
      font-size: 0.9em;
      margin-top: 4px;
    }
    .message {
      margin-top: 20px;
      font-size: 1em;
      text-align: center;
    }