body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fb;
}

.container {
  max-width: 520px;
  margin: 60px auto;
  background: #fff;
  border: 1px solid #e6ebf2;
  border-radius: 8px;
  padding: 24px;
}

h1 {
  margin-top: 0;
  font-size: 24px;
}

form {
  display: grid;
  gap: 10px;
}

input,
button {
  height: 40px;
  font-size: 14px;
  padding: 0 12px;
}

button {
  border: none;
  background: #1366d6;
  color: #fff;
  cursor: pointer;
}

pre {
  margin-top: 16px;
  background: #10131a;
  color: #d3f4d0;
  padding: 12px;
  border-radius: 6px;
  min-height: 120px;
  white-space: pre-wrap;
  word-break: break-word;
}

.hidden {
  display: none;
}