:root {
  color-scheme: light dark;
  --background: #fafafa;
  --text: #1a1a1a;
  --accent: #087fc4;
  --muted: #6b7280;
  --rule: rgb(26 26 26 / 14%);
  --spacing: 1.5rem;
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max-width: 1600px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #1a1a1a;
    --text: #fafafa;
    --accent: #58b7ef;
    --muted: #a7adb7;
    --rule: rgb(250 250 250 / 18%);
  }
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  max-width: var(--max-width);
  min-height: 100vh;
  margin: 0 auto;
  padding: 5vw;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: calc(var(--spacing) * 2);
  background: var(--background);
  color: var(--text);
  font-family: var(--font-stack);
  font-size: clamp(1.1rem, 1rem + 0.45vw, 1.5rem);
  line-height: 1.7;
}

header,
main,
footer {
  width: 100%;
  max-width: 60ch;
  margin-inline: auto;
}

header {
  flex: 1 1 12rem;
  padding-bottom: var(--spacing);
}

main {
  flex: 999 1 40rem;
  padding-bottom: calc(var(--spacing) * 2);
}

footer {
  min-width: 100%;
  padding-top: var(--spacing);
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.85em;
}

a {
  color: currentColor;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 0.2ex;
  text-underline-offset: 0.3ex;
}

a:hover {
  text-decoration-thickness: 0.3ex;
}

a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: 2px;
}

img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.25;
  text-wrap: balance;
}

h1 {
  max-width: 24ch;
  font-size: clamp(2.4rem, 2rem + 2vw, 3.55rem);
}

h2 {
  max-width: 32ch;
  font-size: clamp(2rem, 1.7rem + 1.2vw, 2.66rem);
}

h3 {
  max-width: 32ch;
  font-size: clamp(1.55rem, 1.4rem + 0.7vw, 2rem);
}

:is(h1, h2, h3, h4) {
  margin-block-end: calc(var(--spacing) / 2);
}

:is(h1, h2, h3, h4) + * {
  margin-block-start: calc(var(--spacing) / 3);
}

:is(h1, h2, h3, h4) + :where(h2, h3, h4) {
  margin-block-start: calc(var(--spacing) * 2);
}

ul,
ol {
  padding-inline-start: var(--spacing);
}

li {
  margin-block-start: var(--spacing);
}

.title {
  text-decoration: none;
}

.title h1 {
  margin-top: calc(var(--spacing) / 2);
  font-size: 2rem;
}

nav {
  position: sticky;
  top: var(--spacing);
}

nav ul {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--spacing);
  list-style: none;
}

nav li {
  margin: 0;
}

nav a[aria-current="page"] {
  font-weight: 700;
  text-decoration-thickness: 0.3ex;
}

.photo-caption {
  color: var(--muted);
}

.photo-caption {
  margin-top: 0.5rem;
  font-size: 0.8em;
}

@media (min-width: 1000px) {
  nav ul {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  body {
    padding: 1.5rem;
  }

  nav {
    position: static;
  }
}