* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: #f4f6f8;
  color: #222;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 760px;
  background: #fff;
  border: 1px solid #e2e6ea;
  border-radius: 16px;
  padding: 36px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

h1 {
  margin-top: 0;
  font-size: 32px;
}

h2 {
  margin-top: 28px;
  font-size: 20px;
}

p {
  line-height: 1.6;
  font-size: 16px;
}

.small {
  color: #666;
  font-size: 14px;
}

nav {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

a {
  color: #1769aa;
}

nav a {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 8px;
  background: #eef5fb;
  text-decoration: none;
  font-weight: 600;
}

pre {
  background: #f1f1f1;
  padding: 12px;
  border-radius: 8px;
  white-space: pre-wrap;
}