table,
table th,
table td {
  padding: 1px 1px;
  font-size: 0.9em;
  line-height: 1;  /* reduce vertical spacing */
}

.book-header-banner {
  text-align: center;
  background-color: #f0f2f5;
  padding: 12px 0;
}

.book-header-banner img {
  max-width: 220px;
  height: auto;
  display: block;
  margin: 0 auto;
}

.book-footer {
  font-size: 0.85rem;
  color: #555;
  margin-top: 40px;
  padding: 10px 30px;
  border-top: 1px solid #ddd;
  background-color: #f0f2f5;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: 15px;
}

.footer-icons {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-icons a {
  color: #555;
  font-size: 1.1rem;
  transition: color 0.2s ease;
}

.footer-icons a:hover {
  color: #002E5D;
}

.footer-text {
  font-size: 0.8rem;
  color: #777;
}

.footer-text a {
  color: #004080;
  text-decoration: none;
}

.footer-text a:hover {
  text-decoration: underline;
}

.version-chip {
  display: inline-block;
  padding: 1px 8px;
  border: 1px solid #002E5D;
  border-radius: 10px;
  font-size: 0.7rem;
  font-weight: 600;
  color: #002E5D !important;
  background-color: #fff;
}

.version-chip:hover {
  background-color: #002E5D;
  color: #fff !important;
  text-decoration: none !important;
}

/* No sidebar logo is used; collapse the empty placeholder and its dead space */
.sidebar-logo-link {
  display: none;
}

.sidebar-header {
  padding-top: 0.5rem;
  margin-top: 0;
}

/* Minimalist version chip: soft gray fill, no border, muted text, short */
.sidebar-title .version-chip {
  display: inline-block;
  margin-top: 0.35rem;
  white-space: nowrap;
  font-size: 0.62rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.01em;
  padding: 3px 8px;
  border: none;
  border-radius: 999px;
  color: #6b7280 !important;
  background-color: #eef0f2;
}

.sidebar-title .version-chip:hover {
  background-color: #e3e6ea;
  color: #4b5563 !important;
  text-decoration: none !important;
}

/* Cross-listed course numbers above the syllabus block on the page */
.course-numbers-page {
  font-size: 0.95rem;
  font-weight: 500;
  color: #6c757d;
  letter-spacing: 0.03em;
  margin-bottom: 0.75rem;
}

/* Cross-listed course numbers under the sidebar title */
.sidebar-course-numbers {
  font-size: 0.75rem;
  font-weight: 500;
  color: #6c757d;
  letter-spacing: 0.02em;
  margin: 0.15rem 0 0.4rem 0;
}



.tweet-center {
  display: flex;
  justify-content: center;
}
.tweet-center .twitter-tweet {
  margin: 0 auto;      /* removes extra left offset */
  display: inline-block;
}

.embed-center {
  display: flex;
  justify-content: center;
}


.responsive-video {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 ratio, adjust if needed */
  height: 0;
  overflow: hidden;
  max-width: 100%;
}

.responsive-video video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}