body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f6f7f9;
  color: #1f2328;
}

.container {
  max-width: 760px;
  margin: 32px auto;
  padding: 0 16px;
}

.panel {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

input[type="text"],
input[type="file"] {
  width: 100%;
  box-sizing: border-box;
  margin: 8px 0;
  padding: 8px;
}

button {
  padding: 8px 14px;
  border: 0;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

#message {
  min-height: 20px;
  color: #4b5563;
}