html {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f5f7fa;
  color: #202124;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.7;
}

header {
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  padding: 28px 20px;
  text-align: center;
}

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

header p {
  margin: 5px 0 0;
  color: #6b7280;
}

main {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 20px;
}

section {
  background: #ffffff;
  margin-bottom: 24px;
  padding: 28px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
}

h2 {
  margin-top: 0;
  color: #111827;
}

a {
  color: #1769aa;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  padding: 30px 20px;
  text-align: center;
  color: #6b7280;
  font-size: 14px;
  border-top: 1px solid #e5e7eb;
}

@media (max-width: 600px) {
  main {
    margin: 25px auto;
  }

  section {
    padding: 20px;
  }

  header h1 {
    font-size: 26px;
  }
}