:root {
  --color-text: #333;
  --color-brand: #17719b;
  --color-page: #f7f5f1;
  --color-rule: #333;
  --space-1: 5px;
  --space-2: 10px;
  --space-3: 20px;
  --space-4: 40px;
  --font-body: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
  --content-width: 60rem;
}

html {
  box-sizing: border-box;
  scroll-padding-top: 100px;
}
*, *:before, *:after {
  box-sizing: inherit;
}
body {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 5%;
  background: var(--color-page);
  font-family: var(--font-body);
  font-size: 20px;
  line-height: 1.5;
  color: var(--color-text);
}
img {
  max-width: 100%;
  height: auto;
}
h1, h2, h3 {
  font-family: var(--font-body);
  font-size-adjust: 0.5;
  margin: var(--space-1) 0;
  line-height: 1.2;
}
h1 {
  line-height: 1.1;
  margin-top: 0;
}
h2 {
  margin-bottom: var(--space-3);
}
a {
  color: var(--color-brand);
}
:focus-visible {
  outline: 2px solid var(--color-brand);
  outline-offset: 2px;
}

body > nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-page);
  padding: var(--space-2) 0;
}
nav ul {
  list-style-type: none;
  max-width: var(--content-width);
  margin-inline: auto;
  padding: 0;
  display: flex;
  justify-content: center;
  border-bottom: 1px solid var(--color-rule);
}
nav a {
  padding: var(--space-2) var(--space-3);
  font-size: 20px;
  text-decoration: none;
  color: var(--color-text);
}
nav a:hover {
  text-decoration: underline wavy var(--color-brand);
}

body > header {
  max-width: var(--content-width);
  margin-inline: auto;
  margin-bottom: var(--space-4);
  text-align: center;
}

@media (min-width: 781px) {
  html {
    scroll-padding-top: 85px;
  }
}

main figure {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  margin-bottom: var(--space-3);
}
main figure img {
  display: block;
  width: 100%;
  height: auto;
}
main figcaption {
  margin-top: var(--space-1);
  text-align: center;
  font-size: 0.8em;
  font-style: italic;
  color: var(--color-text);
}
main h2,
main p {
  max-width: var(--content-width);
  margin-inline: auto;
}

footer {
  border-top: 1px solid var(--color-rule);
  margin-top: var(--space-4);
}