body {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: #1f2937;
  background: #f8fafc;
}

.container {
  max-width: 720px;
  margin: 40px auto;
  padding: 24px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

h1 { font-size: 28px; margin-bottom: 8px; }
.subtitle { color: #64748b; margin-bottom: 24px; }

.field { margin-bottom: 16px; }
.field-inline { display: flex; align-items: center; gap: 8px; margin: 12px 0; }
label { display: block; font-weight: 600; margin-bottom: 6px; }
input[type="text"], input[type="url"], input[type="file"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
}

button {
  background: #2563eb;
  color: white;
  border: 0;
  padding: 10px 16px;
  border-radius: 8px;
  cursor: pointer;
}

.result { margin-top: 24px; }
.result pre { background: #0f172a; color: #e2e8f0; padding: 12px; border-radius: 8px; overflow: auto; }

.loading { display: flex; align-items: center; gap: 12px; margin-top: 16px; }
.spinner {
  width: 20px; height: 20px;
  border: 3px solid #dbeafe;
  border-top-color: #2563eb;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}