.course-page {
  padding-top: 2.25rem;
  padding-bottom: 4.5rem;
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted-foreground);
  font-size: 0.8rem;
  font-weight: 700;
}

.crumbs a:hover { color: var(--foreground); }

.course-top {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.15rem;
}

.course-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.course-intro h1 {
  margin-top: 0.9rem;
  font-size: 1.85rem;
  font-weight: 900;
  line-height: 1.45;
  letter-spacing: -0.03em;
}

.course-intro > p {
  max-width: 38rem;
  margin-top: 0.8rem;
  color: var(--muted-foreground);
  font-size: 0.98rem;
  line-height: 2rem;
}

.course-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.course-metrics li {
  border-radius: 20px;
  padding: 0.8rem 0.85rem;
  background: var(--muted);
}

.course-metrics strong,
.fact-row strong,
.teacher-band strong,
.side-card > strong {
  display: block;
  font-weight: 900;
  line-height: 1.6rem;
}

.course-metrics strong { font-size: 1.05rem; }

.course-metrics span,
.fact-row small,
.teacher-band span,
.course-length {
  color: var(--muted-foreground);
  font-size: 0.75rem;
  font-weight: 700;
}

.course-poster {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  order: -1;
  min-height: 17rem;
  padding: 1.2rem;
  overflow: hidden;
  border-radius: 32px;
  color: oklch(0.98 0.01 155);
  box-shadow: var(--shadow-raised);
}

.course-poster::before,
.course-poster::after {
  content: "";
  position: absolute;
  border-radius: 999px;
  border: 1px solid oklch(1 0 0 / 0.18);
}

.course-poster::before {
  width: 16rem;
  height: 16rem;
  top: -6.5rem;
  left: -4.5rem;
}

.course-poster::after {
  width: 9rem;
  height: 9rem;
  right: -2.5rem;
  bottom: 2.5rem;
  background: oklch(1 0 0 / 0.06);
}

.poster-top,
.poster-bottom,
.poster-mark { position: relative; }

.poster-top,
.poster-foot {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.poster-no {
  font-size: 0.85rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  opacity: 0.8;
}

.poster-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 4.25rem;
  height: 4.25rem;
  border-radius: 22px;
  background: oklch(1 0 0 / 0.12);
  border: 1px solid oklch(1 0 0 / 0.22);
}

.poster-mark .icon { width: 2rem; height: 2rem; }

.poster-bottom strong {
  display: block;
  max-width: 16rem;
  font-size: 1.45rem;
  font-weight: 900;
  line-height: 1.55;
}

.poster-foot { margin-top: 0.85rem; flex-wrap: wrap; }

.poster-foot span,
.course-cover-tag {
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
  background: oklch(1 0 0 / 0.14);
  font-size: 0.72rem;
  font-weight: 800;
}

.teacher-band,
.fact-row li,
.course-block,
.side-card,
.side-share {
  border-radius: 28px;
  background: var(--gradient-surface);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-raised);
}

.teacher-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  margin-top: 1rem;
  padding: 0.9rem 1rem;
}

.teacher-band div { min-width: 12rem; }

.teacher-band strong { font-size: 1rem; }

.course-avatar-lg {
  width: 3.2rem;
  height: 3.2rem;
  font-size: 1.05rem;
}

.teacher-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-inline-start: auto;
  border-radius: 999px;
  padding: 0.5rem 0.85rem;
  background: var(--gradient-soft);
  color: var(--accent-foreground);
  font-size: 0.78rem;
  font-weight: 800;
}

.fact-row {
  display: grid;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.fact-row li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 0.9rem;
}

.fact-icon {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 2.7rem;
  height: 2.7rem;
  border-radius: 999px;
  background: var(--gradient-soft);
  color: var(--accent-foreground);
}

.fact-row strong { font-size: 0.95rem; }

.course-layout {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.course-block { padding: 1.2rem 1.15rem 1.3rem; }

.course-block + .course-block,
.course-split { margin-top: 0.85rem; }

.course-block h2 {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.8rem;
  font-size: 1.12rem;
  font-weight: 900;
}

.course-block p {
  color: var(--muted-foreground);
  font-size: 0.92rem;
  line-height: 2rem;
}

.course-block p + p { margin-top: 0.7rem; }

.course-result {
  padding: 0.9rem 1rem;
  border-radius: 18px;
  background: var(--gradient-soft);
  color: var(--foreground);
}

.course-result b { font-weight: 900; }

.course-length { margin-top: 0.9rem; }

.outcome-grid,
.plain-list,
.syllabus {
  display: grid;
  gap: 0.65rem;
}

.outcome-grid li,
.plain-list li {
  color: var(--foreground);
  font-size: 0.9rem;
  line-height: 1.85rem;
}

.outcome-grid li {
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  border-radius: 18px;
  padding: 0.8rem 0.9rem;
  background: var(--muted);
}

.outcome-grid li > span {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 1.7rem;
  height: 1.7rem;
  margin-top: 0.15rem;
  border-radius: 999px;
  background: var(--gradient-accent);
  color: var(--primary-foreground);
  font-size: 0.75rem;
  font-weight: 900;
}

.plain-list li {
  position: relative;
  padding-inline-start: 1rem;
}

.plain-list li::before {
  content: "";
  position: absolute;
  top: 0.75rem;
  inset-inline-start: 0;
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 999px;
  background: var(--azure);
}

.syllabus { list-style: none; }

.chapter { border-radius: 22px; padding: 0.95rem 1rem 0.35rem; background: var(--muted); }

.chapter-head {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding-bottom: 0.15rem;
  cursor: pointer;
  list-style: none;
}

.chapter-head::-webkit-details-marker { display: none; }

.chapter-chevron {
  margin-inline-start: 0.15rem;
  color: var(--muted-foreground);
  transform: rotate(-90deg);
  transition: transform 0.2s var(--ease);
}

.chapter[open] .chapter-chevron { transform: rotate(90deg); }

.chapter[open] .chapter-head { padding-bottom: 0.7rem; }

.chapter-no,
.chapter-head em,
.lesson-no {
  color: var(--muted-foreground);
  font-size: 0.75rem;
  font-style: normal;
  font-weight: 800;
}

.chapter-head strong { font-size: 1rem; font-weight: 900; }

.chapter-head em { margin-inline-start: auto; }

.lesson-line {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  border-top: 1px solid var(--border);
  padding: 0.62rem 0;
  color: var(--foreground);
  font-size: 0.9rem;
  line-height: 1.7rem;
}

.lesson-no { min-width: 1.4rem; }

.side-card { display: grid; gap: 0.75rem; padding: 1.1rem; }

.side-card > strong { font-size: 1rem; line-height: 1.7rem; }

.side-card ul { display: grid; gap: 0.45rem; }

.side-card li {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted-foreground);
  font-size: 0.82rem;
  font-weight: 700;
}

.side-share {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  padding: 0.85rem;
}

.side-share span {
  width: 100%;
  font-size: 0.8rem;
  font-weight: 800;
}

.side-share a,
.side-share button {
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  background: var(--muted);
  color: var(--foreground);
  font: inherit;
  font-size: 0.72rem;
  font-weight: 800;
}

.side-share button[data-copied="true"] {
  background: var(--gradient-accent);
  color: var(--primary-foreground);
}

.catalog-course {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  border-radius: 28px;
  background: var(--gradient-surface);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-raised);
  color: inherit;
}

.catalog-course-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 0.55rem;
  padding: 1rem 1.05rem 1.05rem;
}

.catalog-course-body h2 {
  font-size: 1rem;
  font-weight: 900;
  line-height: 1.7rem;
}

.catalog-course-body p {
  color: var(--muted-foreground);
  font-size: 0.82rem;
  line-height: 1.75rem;
}

.catalog-course-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin-top: auto;
  padding-top: 0.35rem;
}

.catalog-course-meta span {
  color: var(--muted-foreground);
  font-size: 0.72rem;
  font-weight: 700;
}

.catalog-course-meta b {
  margin-inline-start: auto;
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  background: var(--gradient-accent);
  color: var(--primary-foreground);
  font-size: 0.75rem;
}

@media (min-width: 720px) {
  .course-intro h1 { font-size: 2.15rem; }
  .fact-row,
  .outcome-grid,
  .course-split { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .course-top {
    grid-template-columns: minmax(0, 1.12fr) minmax(18rem, 0.88fr);
    align-items: stretch;
    gap: 1.5rem;
  }

  .course-poster {
    order: 0;
    min-height: 100%;
  }

  .fact-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }

  .course-layout {
    grid-template-columns: minmax(0, 1fr) 18.5rem;
    align-items: start;
  }

  .course-side {
    position: sticky;
    top: 5.5rem;
  }
}