:root {
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  color: #151515;
  background: #f5f5f7;
  font-synthesis: none;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  line-height: 1.65;
}

main {
  width: min(100% - 32px, 720px);
  margin: 0 auto;
  padding: 64px 0 80px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}

.mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 12px;
  background: #df3e35;
  color: white;
  font-size: 0;
}

.mark::after {
  content: "";
  width: 25px;
  height: 14px;
  border-radius: 55% 45% 45% 55%;
  background: white;
  box-shadow: -7px -6px 0 -5px white, 1px -8px 0 -6px white;
}

h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 2px; font-size: 25px; letter-spacing: 0; }
h2 { margin: 42px 0 14px; font-size: 19px; }
h3 { margin: 26px 0 8px; font-size: 16px; }
.brand p, .updated, .note { color: #6e6e73; }

nav, article {
  overflow: hidden;
  border: 1px solid #e2e2e7;
  border-radius: 12px;
  background: white;
}

nav a {
  display: flex;
  justify-content: space-between;
  padding: 17px 18px;
  color: inherit;
  text-decoration: none;
}

nav a + a { border-top: 1px solid #ececf0; }
nav a:active { background: #f2f2f4; }
.note { margin-top: 24px; font-size: 14px; }

article { padding: 28px; }
article h1 { font-size: 28px; }
article p, article li { font-size: 15px; }
ul { padding-left: 22px; }
a { color: #b92f29; }

@media (max-width: 520px) {
  main { width: min(100% - 24px, 720px); padding: 30px 0 48px; }
  article { padding: 22px 18px; }
  article h1 { font-size: 24px; }
}