body {
  font-family: sans-serif;
  max-width: 640px;
  margin: 32px auto;
  padding: 0 16px;
  color: #222;
}

.lead {
  color: #555;
}

.banner {
  padding: 12px 16px;
  border-radius: 4px;
  margin: 16px 0;
}

.banner-warn {
  background: #fff3cd;
  border: 1px solid #ffe08a;
}

.banner-error {
  background: #fde2e1;
  border: 1px solid #f5a7a3;
}

#upload-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 16px 0;
}

#preview {
  width: 100%;
  height: 480px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}