* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: #0b0f1a;
  color: #e5e7eb;
}
.container {
  max-width: 900px;
  margin: 24px auto;
  padding: 0 16px 24px;
}
h1 { margin-bottom: 16px; }
.card {
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 14px;
}
.row {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
input, select, textarea, button {
  background: #0f172a;
  color: #e5e7eb;
  border: 1px solid #334155;
  border-radius: 8px;
  padding: 8px 10px;
}
input, select { min-width: 220px; }
textarea { width: 100%; }
button { cursor: pointer; }
pre {
  background: #020617;
  border: 1px solid #1e293b;
  border-radius: 8px;
  padding: 10px;
  overflow-x: auto;
  white-space: pre-wrap;
  margin: 0;
}