* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f3f4f6;
  color: #111827;
}

.container {
  width: min(700px, 92%);
  margin: 40px auto;
}

.hero {
  text-align: center;
  margin-bottom: 24px;
}

.card {
  background: white;
  padding: 22px;
  margin: 16px 0;
  border-radius: 16px;
  box-shadow: 0 4px 18px rgba(0,0,0,.08);
}

input {
  width: 100%;
  padding: 12px;
  margin: 7px 0;
  border: 1px solid #d1d5db;
  border-radius: 10px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 11px 16px;
  margin: 7px 5px 7px 0;
  cursor: pointer;
  font-weight: 700;
}

.secondary {
  background: #e5e7eb;
}

.badge {
  display: inline-block;
  padding: 5px 10px;
  border-radius: 999px;
  background: #dbeafe;
}

pre {
  white-space: pre-wrap;
  background: #111827;
  color: white;
  padding: 14px;
  border-radius: 10px;
}

.hint {
  color: #6b7280;
  font-size: .9rem;
}