:root {
  --ink: #17242b;
  --muted: #61727c;
  --line: #d7e3e8;
  --soft: #f4f8fa;
  --paper: #ffffff;
  --accent: #1f6f8b;
  --accent-strong: #174f63;
  --shadow: 0 7px 18px rgba(23, 36, 43, .05);
  color-scheme: light;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: #ffffff;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.55;
}
a {
  color: var(--accent-strong);
  text-decoration-thickness: .08em;
  text-underline-offset: .18em;
}
a:hover,
a:focus { color: var(--accent); }
.compact-artifact {
  background: linear-gradient(90deg, #eef7f9, #fff 74%);
  border-bottom: 1px solid var(--line);
}
.compact-artifact-inner {
  margin: 0 auto;
  max-width: 1220px;
  padding: 30px 32px;
}
h1 {
  margin: 0;
  font-size: clamp(30px, 3.5vw, 48px);
  letter-spacing: 0;
  line-height: 1.05;
}
.lede {
  color: #263841;
  font-size: 18px;
  margin: 14px 0 0;
  max-width: 760px;
}
.main {
  margin: 0 auto;
  max-width: 1220px;
  padding: 34px 32px 58px;
}
.breadcrumb {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 18px;
}
.search-box {
  width: min(100%, 34rem);
  min-height: 2.5rem;
  margin: 0 0 1.25rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.5rem 0.65rem;
  background: var(--paper);
  font: inherit;
}
.no-results {
  display: none;
  color: var(--muted);
  margin: 0 0 1rem;
}
body.no-results .no-results { display: block; }
body.has-filter [data-bibliography-index-item][hidden] { display: none; }
.bibliography-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.bibliography-card {
  min-width: 0;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}
.bibliography-card h2 {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: 0;
  line-height: 1.2;
}
.bibliography-card h2 a {
  text-decoration: none;
}
.bibliography-card h2 a:hover,
.bibliography-card h2 a:focus {
  text-decoration: underline;
}
.bibliography-card p {
  margin: 0;
  color: var(--muted);
}
@media (max-width: 760px) {
  .compact-artifact-inner,
  .main {
    padding-left: 20px;
    padding-right: 20px;
  }
  .bibliography-card-grid {
    grid-template-columns: 1fr;
  }
}

.site-masthead {
  background: linear-gradient(rgba(248, 251, 252, .90), rgba(248, 251, 252, .90)), url("cog.png") 0 0 / 25px 25px repeat;
  border-bottom: 1px solid var(--line);
}
.site-masthead-inner {
  align-items: center;
  display: flex;
  gap: 28px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1220px;
  min-height: 112px;
  padding: 22px 32px;
}
.brand-lockup {
  align-items: flex-start;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.logo {
  align-items: center;
  display: inline-flex;
  text-decoration: none;
}
.logo img {
  display: block;
  height: auto;
  width: clamp(154px, 16vw, 218px);
}
.logo-sub {
  color: var(--accent-strong);
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  margin-left: 4px;
  text-transform: uppercase;
}
.site-nav {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  font-size: 15px;
  gap: 18px;
  justify-content: flex-end;
}
.site-nav a,
.site-nav button {
  color: var(--ink);
  font: inherit;
}
.site-nav a {
  text-decoration: none;
}
.site-nav a:hover,
.site-nav a:focus,
.site-nav a.active {
  color: var(--accent-strong);
}
.site-nav a.active {
  font-weight: 700;
}
.site-nav button {
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 0;
}
.course-link {
  background: var(--accent);
  border-radius: 999px;
  color: #fff !important;
  font-weight: 700;
  padding: 12px 18px;
}
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.25rem 1rem;
  text-align: center;
}
.site-footer p {
  margin: 0;
}
@media (max-width: 860px) {
  .site-masthead-inner {
    align-items: flex-start;
    flex-direction: column;
  }
  .site-nav {
    justify-content: flex-start;
    gap: 12px;
  }
}

.ad-slot {
  margin: 28px auto;
  padding: 0;
  width: min(100%, 728px);
  min-height: 90px;
}
.ad-slot ins {
  display: block;
}
@media (max-width: 760px) {
  .ad-slot {
    width: min(100%, 336px);
    min-height: 280px;
  }
}

.acronym-term,
.reference-term {
  position: relative;
  border-bottom: 1px dotted currentColor;
  cursor: help;
  text-decoration: none;
}
.acronym-term:focus,
.reference-term:focus {
  outline: 2px solid rgba(31, 111, 139, 0.28);
  outline-offset: 2px;
}
.acronym-term::after,
.reference-term::after {
  position: absolute;
  left: 50%;
  bottom: 1.55em;
  transform: translateX(-50%);
  z-index: 40;
  width: min(360px, 78vw);
  padding: 0.75rem 0.85rem;
  border: 1px solid #d7e3e8;
  border-radius: 8px;
  background: #ffffff;
  color: #17242b;
  box-shadow: 0 14px 32px rgba(23, 36, 43, 0.18);
  font-size: 0.86rem;
  font-weight: 400;
  line-height: 1.38;
  text-align: left;
  white-space: normal;
  opacity: 0;
  pointer-events: none;
}
.acronym-term::after {
  content: attr(data-definition);
}
.reference-term::after {
  content: attr(data-reference-preview);
}
.acronym-term:hover::after,
.acronym-term:focus::after,
.reference-term:hover::after,
.reference-term:focus::after {
  opacity: 1;
}
@media (max-width: 760px) {
  .acronym-term::after,
  .reference-term::after {
    position: fixed;
    right: 20px;
    bottom: 20px;
    left: 20px;
    width: auto;
    max-width: none;
    transform: none;
  }
  .acronym-term:hover::after,
  .acronym-term:focus::after,
  .reference-term:hover::after,
  .reference-term:focus::after {
    transform: none;
  }
}