* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 100px 40px;
  background: #f0f9ff;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: 0.03em;
  color: #0c4a6e;
}

article {
  max-width: 600px;
  margin: 0 auto;
}

header {
  margin-bottom: 100px;
  text-align: center;
}

h1 {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1.4rem;
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: #0284c7;
  margin: 0;
}

h2 {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: #0284c7;
  margin: 80px 0 40px 0;
  text-align: center;
}

h3 {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: #0284c7;
  margin: 60px 0 30px 0;
  text-align: center;
}

section {
  margin-bottom: 80px;
}

p {
  margin-bottom: 50px;
  text-align: left;
}

a {
  color: #0284c7;
  text-decoration: none;
  border-bottom: 1px solid #bae6fd;
  transition: border-color 0.2s ease;
}

a:hover {
  border-bottom-color: #0284c7;
}

footer {
  margin-top: 100px;
  padding-top: 80px;
  text-align: center;
}

footer p {
  font-style: italic;
  color: #0284c7;
}

@media (max-width: 768px) {
  body {
    padding: 60px 20px;
  }

  header {
    margin-bottom: 60px;
  }

  h1 {
    font-size: 1.2rem;
  }

  h2 {
    font-size: 1rem;
    margin: 60px 0 30px 0;
  }

  h3 {
    font-size: 0.95rem;
    margin: 50px 0 25px 0;
  }

  section {
    margin-bottom: 60px;
  }

  p {
    margin-bottom: 40px;
  }

  footer {
    margin-top: 80px;
    padding-top: 60px;
  }
}