@font-face {
  font-family: "Unbounded";
  src: url("fonts/unbounded-latin-wght-normal.woff2") format("woff2");
  font-weight: 200 900;
  font-display: swap;
}

:root {
  --ultramarine: #1f22d6;
  --indigo: #100e45;
  --cream: #fff5d6;
  --chalk: #f1f0ff;
  --gold: #ffd60a;
  --muted: #47457f;
  --display: "Unbounded", "Arial Black", sans-serif;
  --body: "Instrument Sans", "Segoe UI", system-ui, sans-serif;
  --thread-x: clamp(14px, 2.4vw, 38px);
  --gutter: clamp(40px, 9vw, 150px);
  --edge: clamp(20px, 4vw, 64px);
}

* { box-sizing: border-box; margin: 0; }
body {
  display: flex; flex-direction: column; min-height: 100svh;
  background: var(--cream); color: var(--indigo);
  font: 400 clamp(1.0625rem, .98rem + .3vw, 1.25rem)/1.55 var(--body);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: anywhere;
}
/* The same line down the left as the main page */
body::before {
  content: ""; position: fixed; top: 0; bottom: 0; left: var(--thread-x); z-index: 1; width: 2px; margin-left: -1px;
  background: color-mix(in srgb, var(--indigo) 22%, transparent); pointer-events: none;
}

a { color: inherit; text-underline-offset: .2em; }
a:hover { color: var(--ultramarine); }
:focus-visible { outline: 3px solid var(--ultramarine); outline-offset: 4px; border-radius: 2px; }

.wrap { padding-inline: var(--gutter) var(--edge); }

/* Header */
.nav { background: var(--gold); color: var(--indigo); }
.nav .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .5rem 1rem; padding-block: clamp(.75rem, 2vw, 1.25rem); }
.brand { display: inline-flex; align-items: center; min-height: 44px; font: 700 clamp(.95rem, .85rem + .5vw, 1.25rem)/1.2 var(--display); letter-spacing: -.03em; text-decoration: none; overflow-wrap: normal; }
.brand:hover { color: var(--ultramarine); }
.back {
  display: inline-flex; align-items: center; min-height: 44px; padding: .4em 1.2em; border: 2px solid currentColor; border-radius: 999px;
  font-size: .9em; font-weight: 600; line-height: 1.15; text-decoration: none; transition: background-color .3s, border-color .3s, color .3s; overflow-wrap: normal;
}
.back:hover { background: var(--indigo); border-color: var(--indigo); color: var(--chalk); }

/* Reading area */
main { flex: 1; padding-block: clamp(3rem, 10vh, 6rem); }
main > * { max-width: 46rem; }
h1 { max-width: none; font: 900 clamp(2.1rem, 1.2rem + 5.4vw, 6.5rem)/1 var(--display); letter-spacing: -.05em; margin: 0 0 .35em -.03em; overflow-wrap: normal; }
h2 { font: 700 clamp(1.2rem, 1.05rem + .8vw, 1.75rem)/1.2 var(--display); letter-spacing: -.03em; margin: 2.2em 0 .6em; }
p + p, p + ul, ul + p { margin-top: .8em; }
ul { padding-left: 1.2em; }
li + li { margin-top: .35em; }
li::marker { color: var(--ultramarine); }
main a { color: var(--ultramarine); font-weight: 500; }
main a:hover { color: var(--indigo); }
.updated { color: var(--muted); font-weight: 500; }

/* Footer */
.foot {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .3rem 2rem;
  padding-block: 1.5rem; background: var(--ultramarine); color: var(--chalk); font-size: .95em;
}
.foot nav { display: flex; gap: 1.25rem; }
.foot nav a { display: inline-flex; align-items: center; min-height: 44px; }
.foot nav a[aria-current="page"] { font-weight: 700; }
.foot a:hover { color: var(--gold); }
.foot :focus-visible { outline-color: var(--gold); }