body {
  font-family: sans-serif;
  background: #fafafa;
  margin: 0;
  padding: 0;
}
  
.container {
  max-width: 760px;
  margin: 40px auto;
  padding: 0 16px;
}

.panel {
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

label {
  display: block;
  margin-top: 12px;
}

input,
button {
  width: 100%;
  box-sizing: border-box;
  padding: 10px;
  margin-top: 6px;
}

#payment-element {
  margin-bottom: 16px;
}

pre {
  background: #f5f5f5;
  padding: 12px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.hidden {
  display: none;
}

.state-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 8px 12px;
  margin: 0;
}

.state-grid dt {
  font-weight: bold;
}

.state-grid dd {
  margin: 0;
  word-break: break-word;
}

.button-stack {
  display: grid;
  gap: 10px;
}