* {
  box-sizing: border-box;
}

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

.container {
  max-width: 760px;
  margin: 40px auto;
  padding: 0 16px;
}

h1 {
  margin: 0 0 12px;
}

p {
  line-height: 1.5;
}

.card {
  margin-top: 24px;
  padding: 16px;
  border: 1px solid #334155;
  border-radius: 12px;
  background: #111827;
}

button {
  border: 0;
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
  background: #2563eb;
  color: #ffffff;
}

button:hover {
  background: #1d4ed8;
}