:root {
  --ink: #17242b;
  --muted: #61727c;
  --line: #d7e3e8;
  --soft: #f4f8fa;
  --paper: #ffffff;
  --blue: #1f6f8b;
  --blue-dark: #174f63;
  --blue-soft: #dceef3;
  --gold: #b0852b;
  --shadow: 0 14px 32px rgba(23, 36, 43, 0.09);
  font-family: Arial, Helvetica, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  line-height: 1.55;
}
a { color: var(--blue-dark); text-decoration-thickness: 0.08em; text-underline-offset: 0.18em; }
.site-masthead {
  background:
    linear-gradient(rgba(248, 251, 252, 0.90), rgba(248, 251, 252, 0.90)),
    url("cog.png") 0 0 / 25px 25px repeat;
  border-bottom: 1px solid var(--line);
}
.site-masthead-inner {
  min-height: 112px;
  max-width: 1220px;
  margin: 0 auto;
  padding: 22px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.brand-lockup {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}
.logo {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}
.logo img {
  display: block;
  width: clamp(154px, 16vw, 218px);
  height: auto;
}
.logo-sub {
  display: block;
  margin-left: 4px;
  font-size: 13px;
  color: var(--blue-dark);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 700;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 18px;
  font-size: 15px;
}
.site-nav a { color: #17242b; text-decoration: none; }
.site-nav a:hover { color: var(--blue-dark); }
.site-nav a.active { color: var(--blue-dark); font-weight: 700; }
.course-link {
  padding: 12px 18px;
  border-radius: 999px;
  background: var(--blue);
  color: #fff !important;
  font-weight: 700;
}
.artifact-hero {
  position: relative;
  min-height: 270px;
  background: #eff6f8 url("assets/communications-banner.jpg") center / cover no-repeat;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.artifact-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 74px;
  background: linear-gradient(174deg, transparent 0 47%, #fff 48% 100%);
  border-top: 6px solid var(--blue);
  transform-origin: right bottom;
}
.artifact-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1220px;
  margin: 0 auto;
  padding: 54px 32px 88px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 150px;
  gap: 28px;
  align-items: center;
}
.artifact-hero h1, .compact-artifact h1 {
  margin: 0;
  font-size: clamp(34px, 4.4vw, 58px);
  line-height: 1.05;
  letter-spacing: 0;
}
.kicker { margin: 0 0 10px; color: var(--blue-dark); font-weight: 700; text-transform: uppercase; letter-spacing: .08em; font-size: 13px; }
.library-home .kicker { text-transform: none; letter-spacing: 0; }
.lede { max-width: 720px; margin: 16px 0 0; font-size: 19px; color: #263841; }
.cover { width: 138px; border-radius: 6px; box-shadow: var(--shadow); }
.compact-artifact {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #eef7f9, #fff 74%);
}
.compact-artifact-inner {
  max-width: 1220px;
  margin: 0 auto;
  padding: 28px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.compact-artifact h1 { font-size: clamp(28px, 3vw, 42px); }
.pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.pill { border: 1px solid var(--line); border-radius: 999px; padding: 7px 11px; background: #fff; color: var(--muted); font-size: 13px; }
main { max-width: 1220px; margin: 0 auto; padding: 34px 32px 56px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; }
.card { border: 1px solid var(--line); border-radius: 8px; background: var(--paper); padding: 20px; box-shadow: 0 7px 18px rgba(23,36,43,.05); }
.card h2, .card h3 { margin: 0 0 8px; line-height: 1.2; }
.card p { margin: 0; color: var(--muted); }
.book-layout { max-width: 1320px; margin: 0 auto; display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 34px; padding: 28px 32px 64px; }
.sidebar { position: sticky; top: 18px; align-self: start; border-right: 1px solid var(--line); padding-right: 22px; }
.sidebar h2 { font-size: 16px; margin: 0 0 12px; }
.sidebar ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.sidebar a { text-decoration: none; color: var(--ink); }
.sidebar a.active { color: var(--blue-dark); font-weight: 700; }
.content { max-width: 820px; padding: 0; margin: 0; }
.breadcrumb { color: var(--muted); font-size: 14px; margin: 0 0 16px; }
.content h1 { margin: 0 0 18px; font-size: 36px; line-height: 1.15; }
.content h2 { margin-top: 34px; font-size: 24px; }
.figure-placeholder { margin: 28px auto; max-width: 520px; border: 1px solid var(--line); border-radius: 8px; padding: 24px; background: var(--soft); text-align: center; color: var(--muted); }
.reading-shell .site-masthead-inner { min-height: 78px; padding-top: 14px; padding-bottom: 14px; }
.reading-shell .logo img { width: clamp(132px, 12vw, 170px); }
.reading-shell .logo-sub { display: none; }
.reading-strip { border-bottom: 1px solid var(--line); background: #f8fbfc; }
.reading-strip-inner { max-width: 1320px; margin: 0 auto; padding: 12px 32px; display: flex; gap: 14px; justify-content: space-between; color: var(--muted); font-size: 14px; }
footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}
footer div { max-width: 1220px; margin: 0 auto; padding: 22px 32px; }
@media (max-width: 820px) {
  .site-masthead-inner, .compact-artifact-inner, .reading-strip-inner { align-items: flex-start; flex-direction: column; }
  .site-nav { justify-content: flex-start; gap: 12px; }
  .artifact-hero-inner { grid-template-columns: 1fr; padding-bottom: 86px; }
  .cover { width: 108px; }
  .book-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; border-right: 0; border-bottom: 1px solid var(--line); padding: 0 0 20px; }
}

.reading-strip strong { color: var(--ink); font-weight: 700; }