:root {
  color-scheme: dark;
  font-family: Arial, sans-serif;
}

body {
  margin: 0;
  background: #121212;
  color: #f3f3f3;
}

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 14px;
}

.card {
  border: 1px solid #2d2d2d;
  background: #1e1e1e;
  border-radius: 12px;
  padding: 12px;
  display: grid;
  gap: 8px;
}

label { font-size: 0.9rem; }
input, select, button {
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #3a3a3a;
  background: #161616;
  color: #fff;
}

button {
  background: #2962ff;
  border: none;
  font-weight: 700;
}

pre {
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

@media (min-width: 768px) {
  .container { padding: 24px; }
}