body {
  font-family: Arial, sans-serif;
  background: #222;
  color: #fff;
  padding: 30px;
  text-align: center;
}

.login-container,
.admin-panel {
  max-width: 400px;
  margin: auto;
  background: #333;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

input {
  width: 90%;
  padding: 10px;
  margin: 10px 0;
  border: none;
  border-radius: 5px;
}

button {
  padding: 10px 20px;
  background: #8a2be2;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #9932cc;
}

.error {
  color: red;
  margin-top: 10px;
}

.hidden {
  display: none;
}