body {
  font-family: 'Inter', Arial, sans-serif;
  background: linear-gradient(135deg, #f7b42c 0%, #fc575e 50%, #f7b42c 100%);
  background-size: 400% 400%;
  animation: gradientShift 8s ease infinite;
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

h1 {
  font-size: 3em;
  color: #fff;
  margin-bottom: 0.2em;
  text-shadow: 2px 2px 8px #fc575e;
}

#pay {
  background: #fff;
  color: #fc575e;
  border: none;
  border-radius: 30px;
  font-size: 2em;
  padding: 1em 2em;
  box-shadow: 0 4px 24px rgba(252,87,94,0.2);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

#pay:hover {
  background: #fc575e;
  color: #fff;
}

#dollar {
  font-size: 5em;
  animation: bounce 1s infinite alternate;
  color: #fff;
  margin-bottom: 0.5em;
}

@keyframes bounce {
  to {
    transform: translateY(-20px);
  }
}

#message {
  color: #fff;
  font-size: 1.2em;
  margin-bottom: 2em;
  text-align: center;
}

#feedback {
  margin-top: 1em;
  color: #fff;
  font-size: 1.1em;
}