* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}
.wrap { max-width: 900px; margin: 0 auto; padding: 24px; }
header { margin-bottom: 24px; }
h1 { margin: 0 0 8px; font-size: 1.6rem; }
h2 { margin: 0 0 12px; font-size: 1.1rem; }
.card {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}
label { display: block; margin-bottom: 8px; font-size: 0.9rem; }
input, textarea, button {
  font: inherit;
  border-radius: 8px;
  border: 1px solid #475569;
}
input, textarea {
  width: 100%;
  padding: 8px 10px;
  margin-bottom: 8px;
  background: #0f172a;
  color: #e2e8f0;
}
.row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 8px;
  align-items: end;
  margin-bottom: 8px;
}
button {
  padding: 8px 12px;
  background: #2563eb;
  color: white;
  border: none;
  cursor: pointer;
}
button:hover { background: #1d4ed8; }
.out {
  background: #020617;
  border: 1px solid #334155;
  border-radius: 8px;
  padding: 10px;
  min-height: 48px;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.85rem;
}
.hint { font-size: 0.85rem; color: #94a3b8; }
.warning {
  background: #7f1d1d;
  border: 1px solid #ef4444;
  color: #fecaca;
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
}
.warning a { color: #fde68a; }
code { color: #7dd3fc; }