body {
  font-family: 'Verdana', sans-serif;
  background: linear-gradient(to bottom, #e0f7fa, #b2ebf2);
  color: #004d40;
  margin: 0;
  padding: 0;
  text-align: center;
}

header {
  background-color: #00acc1;
  color: white;
  padding: 2rem;
  border-bottom: 2px solid #00796b;
}

header h1 {
  font-size: 2.5rem;
}

.intro img {
  width: 120px;
  margin-top: 1rem;
  animation: flap 2s infinite;
}

@keyframes flap {
  0% { transform: rotate(0deg); }
  50% { transform: rotate(10deg); }
  100% { transform: rotate(0deg); }
}

.password-section, .codes-section {
  margin: 2rem;
  background-color: #ffffff;
  padding: 1rem;
  border-radius: 10px;
  box-shadow: 0 0 10px #80deea;
}

input[type="password"] {
  padding: 0.5rem;
  margin: 0.5rem;
  border: 1px solid #00acc1;
  border-radius: 5px;
}

button {
  padding: 0.5rem 1rem;
  background-color: #00796b;
  color: white;
  border: none;
  cursor: pointer;
  border-radius: 5px;
}

button:hover {
  background-color: #004d40;
}

.hidden {
  display: none;
}

iframe {
  margin-top: 1rem;
  border-radius: 10px;
}

footer {
  background-color: #00acc1;
  color: white;
  padding: 1rem;
  margin-top: 2rem;
}