/* Base: the desk, the page, and book typography. */

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

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

body {
  margin: 0;
  min-height: 100vh;
  padding: var(--space-l) var(--space-s) var(--space-xl);
  background:
    repeating-linear-gradient(92deg, transparent 0 7px, #00000012 7px 9px, transparent 9px 23px),
    radial-gradient(ellipse at 50% 0%, var(--desk-grain), var(--desk) 70%);
  background-color: var(--desk);
  color: var(--ink);
  font-family: var(--font-book);
  font-size: var(--step-0);
  font-variant-numeric: oldstyle-nums proportional-nums;
  line-height: var(--leading);
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

/* The sheet of paper */
.page {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - var(--space-l) - var(--space-xl));
  width: min(100%, var(--page-width));
  margin-inline: auto;
  padding: var(--space-xl) var(--page-margin) var(--space-l);
  background:
    url("../paper-grain.svg"),
    radial-gradient(ellipse at 50% 30%, #ffffff55, transparent 70%),
    linear-gradient(90deg, var(--paper-shade), transparent 4%, transparent 96%, var(--paper-shade));
  background-color: var(--paper);
  box-shadow:
    0 1px 0 #ffffff40 inset,
    0 2px 4px #0000004d,
    0 18px 50px #00000080;
}

main {
  display: block;
  flex: 1;
  padding-top: var(--space-l);
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 400;
  line-height: 1.15;
  text-wrap: balance;
}

h1 {
  font-size: var(--step-4);
}

h2 {
  font-size: var(--step-3);
}

h3 {
  font-size: var(--step-1);
}

p {
  margin-block: 0 var(--space-s);
  text-wrap: pretty;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-bright);
  text-decoration-thickness: 2px;
}

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

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin-block: var(--space-l);
}

.small-caps {
  font-variant-caps: all-small-caps;
  letter-spacing: var(--tracking-caps);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.muted {
  color: var(--ink-soft);
}

.skip-link {
  position: absolute;
  top: -5rem;
  left: var(--space-s);
  z-index: 10;
  padding: var(--space-xs) var(--space-s);
  background: var(--paper);
}

.skip-link:focus {
  top: var(--space-s);
}

section[id] {
  scroll-margin-top: var(--space-m);
}

/* Gentle cross-fade when turning pages (supporting browsers only). */
@view-transition {
  navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 260ms;
  animation-timing-function: ease-out;
}

@media (prefers-reduced-motion: reduce) {
  @view-transition {
    navigation: none;
  }
}

/* On small screens the page fills the screen; the desk disappears. */
@media (max-width: 40rem) {
  body {
    padding: 0;
    background: var(--paper);
  }

  .page {
    min-height: 100vh;
    padding-top: var(--space-l);
    box-shadow: none;
  }

  .ribbon {
    top: 0;
  }
}

@media print {
  body {
    padding: 0;
    background: none;
  }

  .page {
    width: auto;
    padding: 0;
    background: none;
    box-shadow: none;
  }

  .ribbon,
  .skip-link,
  .page-turn,
  .page-list,
  .request-card {
    display: none;
  }
}