body {
  max-width: 40em;
  margin: 0 auto;
  padding: 0 1em 2em;
  line-height: 1.5;
  font-family: Georgia, "Times New Roman", serif;
  color: #111;
}

body.map-page {
  max-width: 52em;
}

header {
  margin: 1.25em 0 1.5em;
  padding-bottom: 0.75em;
  border-bottom: 1px solid #ccc;
}

header .site-title {
  font-size: 1.15em;
  margin: 0 0 0.35em;
  font-weight: normal;
}

header .site-title a {
  color: inherit;
  text-decoration: none;
}

header .site-title a:hover {
  text-decoration: underline;
}

nav {
  font-size: 0.9em;
  line-height: 1.7;
}

nav a {
  color: #0645ad;
}

.nav-dropdown {
  display: inline-block;
  position: relative;
}

.nav-dropdown summary {
  display: inline;
  cursor: pointer;
  color: #0645ad;
  list-style: none;
}

.nav-dropdown summary::-webkit-details-marker {
  display: none;
}

.nav-dropdown summary::after {
  content: " ▾";
  font-size: 0.85em;
}

.nav-dropdown[open] summary::after {
  content: " ▴";
}

.nav-dropdown ul {
  position: absolute;
  z-index: 10;
  top: 100%;
  left: 0;
  margin: 0.35em 0 0;
  padding: 0.35em 0;
  min-width: 14em;
  list-style: none;
  background: #fff;
  border: 1px solid #ccc;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.nav-dropdown li {
  margin: 0;
}

.nav-dropdown a {
  display: block;
  padding: 0.35em 0.85em;
  text-decoration: none;
}

.nav-dropdown a:hover {
  background: #f5f5f5;
}

main h1 {
  font-size: 1.6em;
  font-weight: normal;
  margin: 0 0 0.75em;
}

main h2 {
  font-size: 1.2em;
  font-weight: normal;
  margin: 1.5em 0 0.5em;
}

main h3 {
  font-size: 1.05em;
  font-weight: normal;
  margin: 1.25em 0 0.4em;
}

main ul {
  padding-left: 1.75em;
  list-style-position: outside;
}

main ul ul {
  margin: 0.35em 0;
  padding-left: 1.5em;
}

main li {
  margin: 0.35em 0;
}

main a {
  color: #0645ad;
}

.parents {
  margin-top: 2em;
  padding-top: 0.75em;
  border-top: 1px solid #ccc;
  font-size: 0.95em;
  color: #444;
}

.diagram-wrap {
  overflow-x: auto;
  margin: 1.25em 0 1.5em;
  padding: 0.5em 0;
}

.diagram-wrap .mermaid {
  display: flex;
  justify-content: center;
}

.diagram-note {
  font-size: 0.9em;
  color: #555;
  margin: 0 0 1em;
}

img.content-img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1em 0;
}

footer {
  margin-top: 2.5em;
  padding-top: 0.75em;
  border-top: 1px solid #ccc;
  font-size: 0.9em;
  color: #555;
}