* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f6f8;
  color: #17202a;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
}

.card {
  background: white;
  padding: 22px;
  margin: 18px 0;
  border-radius: 12px;
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.08);
}

.warning {
  padding: 12px;
  border-radius: 8px;
  background: #fff3cd;
}

button {
  padding: 10px 16px;
  margin: 5px;
  cursor: pointer;
  border: 0;
  border-radius: 7px;
}

input {
  padding: 10px;
  width: 280px;
}

pre {
  background: #111827;
  color: #e5e7eb;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
}