/* 课程特有的目录与元信息；颜色和阅读布局来自全站公共样式。 */
.rejava-card { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 20px; padding: 24px 0; border-bottom: 1px solid var(--site-line); overflow-wrap: anywhere; transition: border-color .15s; }
.rejava-card:hover { border-color: var(--site-accent); text-decoration: none; }
.rejava-number { font-family: var(--site-serif); font-size: 1.7rem; color: var(--site-muted); line-height: 1.5; }
.rejava-card h3 { margin-bottom: 8px; color: var(--site-ink); font-family: var(--site-serif); font-size: 1.2rem; font-weight: 700; line-height: 1.6; }
.rejava-card p { margin-bottom: 12px; font-size: .9rem; color: var(--site-muted); line-height: 1.85; }
.rejava-read { font-size: .8rem; }
.rejava-references > a { display: flex; justify-content: space-between; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--site-line); font-size: .9rem; overflow-wrap: anywhere; }
.rejava-references > a > span { flex-shrink: 0; }
.rejava-provenance { margin-top: 12px; font-size: .8rem; color: var(--site-muted); }
.rejava-changes { margin-top: 12px; font-size: .85rem; }
.rejava-changes summary { display: list-item; list-style: disclosure-closed inside; color: var(--site-accent); cursor: pointer; }
.rejava-changes[open] summary { list-style-type: disclosure-open; margin-bottom: 8px; }
.rejava-changes ul { list-style: disc; padding-left: 20px; }
.course-index-layout { display: grid; grid-template-columns: 170px minmax(0, 1fr); gap: 44px; align-items: start; }
.course-index-rail { position: sticky; top: 30px; padding-top: 6px; }
.course-index-rail nav { display: grid; gap: 2px; }
.course-index-rail nav a { display: flex; align-items: center; gap: 15px; min-height: 44px; color: var(--site-muted); font-size: .8rem; }
.course-index-rail nav a:hover { color: var(--site-accent); }
.course-index-rail nav span { color: var(--site-accent); font-family: var(--site-mono); font-size: .6rem; }
.course-index-rail__note { margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--site-line); color: var(--site-muted); font-family: var(--site-mono); font-size: .65rem; line-height: 2; }
.course-index-content { min-width: 0; }
.course-index-content > .page-section { margin-top: 48px; }
.course-index-content > .page-section:first-child { margin-top: 0; }
.course-index-content h2 { scroll-margin-top: 24px; }
.course-index .section-heading > span { font-size: .7rem; }
.course-index .rejava-number { color: var(--site-accent); font-family: Georgia, var(--site-serif); font-style: italic; }
.course-index .rejava-card h3 { font-size: 1.22rem; }
.course-index .rejava-references > a { color: var(--site-ink); font-family: var(--site-serif); font-size: 1.05rem; line-height: 1.8; }
.course-index .rejava-references > a:hover { color: var(--site-accent); }
.course-index .rejava-references > a > span { font-family: var(--site-mono); font-size: .7rem; color: var(--site-accent); }
@media (max-width: 760px) {
  .course-index-layout { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .course-index-rail { position: static; padding-bottom: 18px; border-bottom: 1px solid var(--site-line); }
  .course-index-rail nav { display: flex; flex-wrap: wrap; gap: 0 24px; }
  .course-index-rail nav a { gap: 8px; }
  .course-index-rail__note { display: none; }
  .course-index-content > .page-section { margin-top: 36px; }
  .course-index .collection-header { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .course-index .collection-count { display: flex; gap: 16px; align-items: baseline; padding-left: 0; border-left: 0; }
  .course-index .collection-count > span { font-size: 2.6rem; }
  .course-index .collection-count p { margin-top: 0; }
}
@media (max-width: 600px) {
  .rejava-card { padding: 20px 0; grid-template-columns: 28px minmax(0, 1fr); gap: 12px; }
  .rejava-number { font-size: 1.4rem; }
}