* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background: #f4f7fa;
}

.container {
  width: 100%;
  max-width: 400px;
  background: #ffffff;
  padding: 2em;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  text-align: center;
}

h1 {
  color: #333;
  font-size: 24px;
}

p {
  color: #666;
  font-size: 16px;
}

label {
  display: block;
  font-size: 14px;
  color: #333;
  margin-bottom: 0.5em;
  text-align: left;
}

input {
  width: 100%;
  padding: 0.8em;
  margin-bottom: 1em;
  border: 1px solid #ddd;
  border-radius: 4px;
}

button {
  width: 100%;
  padding: 0.8em;
  font-size: 16px;
  color: #ffffff;
  background-color: #6772e5;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  background-color: #5469d4;
}

#payment-message {
  margin-top: 1em;
  font-size: 14px;
  color: #d32f2f;
}

.hidden {
  display: none;
}

#additional-fee,
#total-amount {
  margin: 0.5em 0;
  font-size: 16px;
  color: #333;
}

.hidden {
  display: none;
}

#card-element {
  padding: 1em;
  margin-top: 1em;
  border: 1px solid #ddd;
  border-radius: 4px;
  background: #f9f9f9;
}