:root {
  color-scheme: light dark;
  --page: #ffffff;
  --text: #242424;
  --secondary: #656565;
  --link: #244c91;
  --hairline: #dddddd;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page: #191a1b;
    --text: #e6e6e6;
    --secondary: #aaaaaa;
    --link: #9abcef;
    --hairline: #454545;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 65px 28px 55px;
  background: var(--page);
  color: var(--text);
  font: 400 18px/1.6 Georgia, "Times New Roman", serif;
  overflow-wrap: anywhere;
}

.reading-column {
  max-width: 610px;
  margin: 0 auto;
}

h1 {
  margin: 0 0 8px;
  font-size: 30px;
  font-weight: 400;
  line-height: 1.3;
}

.byline {
  margin-bottom: 30px;
  color: var(--secondary);
  font-size: 14px;
  line-height: 1.5;
}

.introduction {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 78px;
  gap: 26px;
}

.portrait {
  display: block;
  width: 78px;
  height: 78px;
  margin-top: 5px;
  object-fit: cover;
}

h2 {
  margin: 28px 0 12px;
  font-size: 21px;
  font-weight: 400;
  line-height: 1.4;
}

p {
  margin: 0 0 20px;
}

ul {
  margin: 0;
  padding-left: 23px;
}

li {
  margin-bottom: 12px;
}

strong {
  font-weight: 500;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
}

footer {
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--hairline);
  font-size: 14px;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

@media (max-width: 630px) {
  body {
    padding: 43px 24px;
    font-size: 17px;
  }

  h1 {
    font-size: 27px;
  }

  .introduction {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .portrait {
    display: none;
  }
}

@media (max-width: 380px) {
  body {
    padding: 33px 20px;
  }
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
  margin: 0 0 34px;
  font-size: 15px;
}

.site-nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 500;
  text-decoration: none;
}