html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans", "Noto Sans KR",
               sans-serif;
  color: #1f2328;
  background: #fff;
  line-height: 1.6;
}
article {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
article h1, article h2, article h3, article h4 {
  line-height: 1.25;
  margin-top: 1.5em;
  margin-bottom: 0.6em;
}
article h1 { font-size: 1.8rem; border-bottom: 1px solid #e5e7eb; padding-bottom: 0.3em; }
article h2 { font-size: 1.4rem; }
article h3 { font-size: 1.15rem; }
article p, article li { font-size: 1rem; }
article ul, article ol { padding-left: 1.5em; }
article code {
  background: #f3f4f6;
  padding: 0.1em 0.3em;
  border-radius: 4px;
  font-size: 0.9em;
}
article a { color: #0969da; text-decoration: underline; }
article hr { border: 0; border-top: 1px solid #e5e7eb; margin: 2em 0; }