@font-face {
  font-family: "Spectral";
  src: url("/assets/fonts/spectral-latin-600italic.woff2") format("woff2");
  font-style: italic;
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: "Syne";
  src: url("/assets/fonts/syne-latin-600.woff2") format("woff2");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

.universal-header,
.universal-footer {
  --shell-text: #d4cfc4;
  --shell-muted: #b5a99e;
  --shell-accent: #3ecfbf;
  --shell-rule: #3d3833;
  box-sizing: border-box;
  width: min(1040px, calc(100% - 48px));
  margin-inline: auto;
  color: var(--shell-text);
}
.book-page .universal-header,
.book-page .universal-footer {
  --shell-text: #1a1815;
  --shell-muted: #625b53;
  --shell-accent: #0b766b;
  --shell-rule: #ddd8ce;
}
.universal-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 4px 28px;
  padding-block: 14px;
  border-bottom: 1px solid var(--shell-rule);
}
.universal-mark {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--shell-text);
  font: italic 600 32px/1 "Spectral", Georgia, serif;
  text-decoration: none;
  letter-spacing: -0.02em;
}
.universal-mark span { color: var(--shell-accent); }
.universal-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 20px;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
}
.universal-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin: 0;
  padding: 8px 0;
  border: 0;
  color: var(--shell-muted);
  font: 600 13px/1.4 "Syne", system-ui, sans-serif;
  letter-spacing: 0;
  text-decoration: none;
  text-transform: none;
  text-underline-offset: 5px;
}
.universal-nav a[aria-current="page"],
.universal-nav a[aria-current="location"],
.universal-nav a:hover,
.universal-mark:hover { color: var(--shell-accent); }
.universal-nav a[aria-current="page"],
.universal-nav a[aria-current="location"],
.universal-nav a:hover { text-decoration: underline; }
.universal-header :focus-visible,
.universal-footer :focus-visible {
  outline: 3px solid var(--shell-accent);
  outline-offset: 4px;
}
.universal-footer {
  padding-block: 24px 36px;
  border-top: 1px solid var(--shell-rule);
  font: 400 14px/1.7 "Source Sans 3", system-ui, sans-serif;
}
.universal-footer .universal-nav { margin-bottom: 12px; }
.universal-footer p { margin: 4px 0; color: var(--shell-muted); }
.universal-footer p a { color: inherit; text-underline-offset: 3px; }
.site > .universal-header,
.site > .universal-footer { width: 100%; }
.return-to-contents {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 16px;
  font: 600 14px/1.5 "Source Sans 3", system-ui, sans-serif;
  text-underline-offset: 4px;
}
[id] { scroll-margin-top: 20px; }
@media (max-width: 600px) {
  .universal-header,
  .universal-footer { width: calc(100% - 40px); }
  .universal-header { gap: 0; padding-block: 10px; }
  .universal-header .universal-nav { width: 100%; }
  .universal-nav { display: grid; grid-template-columns: repeat(3, max-content); justify-content: space-between; gap: 0 16px; width: 100%; }
}
@media print {
  .universal-header, .universal-footer, .return-to-contents { display: none !important; }
}