:root {
  --color-bg: #fdfdfd;
  --color-text: #1a1a1a;
  --color-muted: #6b6b6b;
  --color-link: #2c5282;
  --color-link-hover: #1a365d;
  --color-rule: #e8e6e1;
  --font-serif: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  --measure: 36rem;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  hanging-punctuation: first;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.1875rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  font-feature-settings: "kern" 1, "liga" 1, "onum" 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.skip-link {
  position: absolute;
  left: 0;
  top: -3rem;
  padding: 0.5rem 1rem;
  background: var(--color-text);
  color: var(--color-bg);
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 5rem 1.5rem 6rem;
}

main > header {
  margin-bottom: 3.5rem;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.tagline {
  margin: 0;
  color: var(--color-muted);
  font-style: italic;
}

section {
  margin-bottom: 3.5rem;
}

h2 {
  margin: 0 0 1.25rem;
  font-size: 1.125rem;
  font-style: italic;
  font-weight: 400;
  color: var(--color-muted);
}

p {
  margin: 0 0 1.25rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--color-link-hover);
}

main > footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-rule);
}

@media (max-width: 640px) {
  body {
    font-size: 1.0625rem;
    line-height: 1.55;
  }

  main {
    padding: 3rem 1.25rem 4rem;
  }

  h1 {
    font-size: 1.625rem;
  }
}