:root { color-scheme: light dark; }

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: linear-gradient(135deg, #0ea5e9, #6366f1);
  padding: 24px;
}

.card {
  max-width: 560px;
  background: #ffffff;
  color: #1e293b;
  padding: 40px 44px;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.25);
}

.badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #0ea5e9;
  background: #e0f2fe;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 16px;
}

h1 { margin: 0 0 12px; font-size: 36px; }

p { line-height: 1.6; margin: 0 0 12px; }

code {
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
  word-break: break-all;
}

.hint { color: #64748b; font-size: 14px; }