body {
  margin: 0;
  font-family: Arial;
  background: #e9f5e9;
  color: #0b3d0b;
}

#login-screen, #notes-screen, #loading-screen {
  display: none;
  padding: 40px;
  text-align: center;
}

#login-screen {
  display: block;
}

input {
  display: block;
  margin: 10px auto;
  padding: 10px;
  width: 200px;
  border: 2px solid #6bbf6b;
  border-radius: 6px;
}

button {
  padding: 10px 20px;
  background: #4caf4f;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background: #3d8f3f;
}

.spinner {
  margin: 30px auto;
  border: 6px solid #c8eac8;
  border-top: 6px solid #4caf4f;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.note {
  background: white;
  padding: 15px;
  border: 2px solid #6bbf6b;
  margin: 10px auto;
  width: 250px;
  border-radius: 8px;
}