.login-container {
  width: 300px;
  margin: 100px auto;
  padding: 30px;
  background: rgba(26, 26, 46, 0.9);
  border-radius: 10px;
  border: 1px solid #4cc9f0;
  box-shadow: 0 0 20px rgba(76, 201, 240, 0.3);
}

.login-container h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #4cc9f0;
}

.login-btn {
  width: 100%;
  padding: 12px;
  background: #4cc9f0;
  border: none;
  border-radius: 4px;
  color: #0d0d1a;
  cursor: pointer;
  font-weight: bold;
  font-size: 16px;
  transition: background 0.3s;
}

.login-btn:hover {
  background: #3aa8d0;
}

.error-message {
  color: #ff6b6b;
  text-align: center;
  margin-top: 15px;
  display: none;
}