* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}

.app {
  max-width: 900px;
  margin: 24px auto;
  padding: 0 16px 24px;
}

header h1 {
  margin: 0 0 6px;
}

header p {
  margin: 0 0 20px;
  color: #94a3b8;
}

.card {
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 14px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

input {
  width: 100%;
  height: 36px;
  border-radius: 8px;
  border: 1px solid #334155;
  background: #0b1220;
  color: #e2e8f0;
  padding: 0 10px;
}

button {
  height: 36px;
  border: 1px solid #2563eb;
  background: #1d4ed8;
  color: #fff;
  border-radius: 8px;
  cursor: pointer;
}

pre {
  white-space: pre-wrap;
  margin: 0;
}