* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  margin: 0;
  padding: 0;
  background: #f7f8fb;
  color: #1f2933;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

header {
  text-align: center;
  margin-bottom: 24px;
}

h1 {
  margin: 0 0 8px;
  font-size: 1.8rem;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: 0 12px 24px rgba(31, 41, 51, 0.08);
}

.card.error {
  border-left: 4px solid #ef4444;
  background: #fef2f2;
}

dl {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px 16px;
  margin: 0;
}

dl dt {
  font-weight: 600;
  color: #475569;
}

dl dd {
  margin: 0;
}

#qrContainer {
  display: flex;
  justify-content: center;
  margin-bottom: 16px;
  min-height: 280px;
}

#qrContainer svg {
  width: min(280px, 60vw);
  height: auto;
}

.qr-error {
  text-align: center;
  color: #b91c1c;
  font-weight: 600;
}

@media (max-width: 480px) {
  dl {
    grid-template-columns: 1fr;
  }

  dl dt {
    color: #0f172a;
  }
}