.course-detail-hero {
  position: relative;
  padding: 105px 34px 80px;
  overflow: hidden;
  border-bottom: 1px solid rgba(139, 92, 246, 0.15);
  background: radial-gradient(circle at 75% 15%, rgba(139, 92, 246, 0.18), transparent 32%);
}
.course-detail-container {
  position: relative;
  z-index: 2;
  width: min(1380px, 100%);
  margin: 0 auto;
}
.course-back-link {
  display: inline-flex;
  margin-bottom: 34px;
  color: #a5b4fc;
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
}
.course-detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(340px, 0.85fr);
  align-items: center;
  gap: 70px;
}
.course-detail-code, .course-section-kicker {
  color: var(--violet);
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
}
.course-detail-copy h1 {
  max-width: 850px;
  margin: 18px 0 22px;
  color: #f8fafc;
  font-size: clamp(48px, 6vw, 84px);
  line-height: 1.02;
  letter-spacing: -3px;
}
.course-detail-level {
  display: inline-flex;
  padding: 8px 14px;
  color: #c7d2fe;
  border: 1px solid rgba(129, 140, 248, 0.32);
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.12);
  font-size: 12px;
  font-weight: 700;
}
.course-detail-image {
  min-height: 380px;
  overflow: hidden;
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: 30px;
  background: rgba(12, 12, 32, 0.72);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}
.course-detail-image img, .course-detail-image-placeholder {
  width: 100%;
  height: 100%;
  min-height: 380px;
  object-fit: cover;
}
.course-detail-image-placeholder {
  display: grid;
  place-items: center;
  color: #c4b5fd;
  font-family: Georgia, serif;
  font-size: 150px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.28), rgba(8, 8, 22, 0.9));
}
.course-detail-content {
  padding: 75px 34px 110px;
}
.course-detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.6fr);
  align-items: start;
  gap: 28px;
}
.course-overview-panel, .course-materials-panel {
  padding: 34px;
  border: 1px solid rgba(139, 92, 246, 0.17);
  border-radius: 24px;
  background: rgba(10, 10, 27, 0.72);
  backdrop-filter: blur(12px);
}
.course-overview-panel h2, .course-materials-panel h2, .related-courses-section h2 {
  margin: 12px 0 20px;
  color: #f1f5f9;
  font-size: 28px;
}
.course-description {
  color: #aab2c4;
  font-size: 17px;
  line-height: 1.85;
}
.course-material-list {
  display: grid;
  gap: 10px;
}
.course-material-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 13px;
  color: #dbe3f0;
  border: 1px solid rgba(129, 140, 248, 0.15);
  border-radius: 13px;
  background: rgba(99, 102, 241, 0.06);
  text-decoration: none;
  transition: 0.25s ease;
}
.course-material-item:hover {
  border-color: rgba(139, 92, 246, 0.55);
  transform: translateY(-2px);
}
.course-material-type {
  padding: 5px 7px;
  color: #a5b4fc;
  border-radius: 7px;
  background: rgba(99, 102, 241, 0.16);
  font-size: 9px;
  font-weight: 800;
}
.course-empty-state {
  color: #7f8a9e;
  line-height: 1.7;
}
.related-courses-section {
  margin-top: 28px;
}
.related-courses-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.related-course-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 9px;
  padding: 22px;
  color: inherit;
  border: 1px solid rgba(129, 140, 248, 0.16);
  border-radius: 18px;
  background: rgba(10, 10, 27, 0.66);
  text-decoration: none;
  transition: 0.25s ease;
}
.related-course-card span {
  grid-column: 1 / -1;
  color: var(--violet);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
}
.related-course-card strong {
  color: #f1f5f9;
  font-size: 16px;
}
.related-course-card i {
  color: #a5b4fc;
  font-style: normal;
}
.related-course-card:hover {
  border-color: rgba(139, 92, 246, 0.5);
  transform: translateY(-4px);
}
.course-not-found {
  min-height: 70vh;
  display: grid;
  place-items: center;
  padding: 80px 30px;
  text-align: center;
}
.course-not-found span {
  color: var(--violet);
  font-size: 70px;
  font-weight: 900;
}
.course-not-found h1 {
  margin: 12px 0 24px;
  font-size: 42px;
}
.course-not-found a {
  color: #c7d2fe;
}
@media (max-width: 900px) {
  .course-detail-grid,   .course-detail-layout {
    grid-template-columns: 1fr;
  }
  .related-courses-grid {
    grid-template-columns: 1fr;
  }
  .course-detail-copy h1 {
    letter-spacing: -1.5px;
  }
}
@media (max-width: 600px) {
  .course-detail-hero,   .course-detail-content {
    padding-left: 20px;
    padding-right: 20px;
  }
  .course-detail-image,   .course-detail-image img,   .course-detail-image-placeholder {
    min-height: 270px;
  }
  .course-overview-panel,   .course-materials-panel {
    padding: 23px;
  }
}
.course-detail-hero {
  border-top:3px solid var(--course-accent)
}
.course-detail-lead {
  max-width:760px;
  color:#aab2c4;
  font-size:18px;
  line-height:1.75
}
.course-detail-facts {
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:24px
}
.course-detail-facts span {
  padding:8px 12px;
  color:#d7d9ff;
  border:1px solid rgba(139,92,246,.25);
  border-radius:999px;
  background:rgba(99,102,241,.08);
  font-size:12px;
  font-weight:700
}
.course-section-nav {
  position:sticky;
  top:96px;
  z-index:40;
  border-bottom:1px solid rgba(139,92,246,.14);
  background:rgba(4,4,12,.88);
  backdrop-filter:blur(16px)
}
.course-section-nav .course-detail-container {
  display:flex;
  gap:4px;
  overflow:auto;
  padding-top:10px;
  padding-bottom:10px
}
.course-section-nav a {
  padding:10px 14px;
  color:#aeb7c7;
  border-radius:10px;
  text-decoration:none;
  font-size:13px;
  font-weight:700;
  white-space:nowrap
}
.course-section-nav a:hover {
  color:#fff;
  background:rgba(139,92,246,.12)
}
.course-main-column {
  display:grid;
  gap:22px
}
.course-content-panel,.course-file-group {
  padding:34px;
  border:1px solid rgba(139,92,246,.17);
  border-radius:24px;
  background:rgba(10,10,27,.72);
  backdrop-filter:blur(12px)
}
.course-content-panel h2 {
  margin:12px 0 20px;
  color:#f1f5f9;
  font-size:30px
}
.course-richtext {
  color:#aab2c4;
  font-size:17px;
  line-height:1.85
}
.course-files-sidebar {
  display:grid;
  gap:16px;
  position:sticky;
  top:165px
}
.course-file-group {
  padding:22px
}
.course-file-group h3 {
  margin-bottom:14px;
  color:#f1f5f9;
  font-size:18px
}
.course-gallery-section {
  margin-top:34px
}
.course-gallery-section h2 {
  margin-bottom:18px;
  font-size:30px
}
.course-gallery-grid {
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:14px
}
.course-gallery-grid img {
  width:100%;
  height:260px;
  object-fit:cover;
  border:1px solid rgba(139,92,246,.18);
  border-radius:18px
}
.course-overview-panel,.course-materials-panel {
  display:none
}

.course-outline-grid{
  line-height: 26px;
}
@media(max-width:900px) {
  .course-files-sidebar {
    position:static
  }
  .course-gallery-grid {
    grid-template-columns:1fr 1fr
  }
  .course-section-nav {
    top:82px
  }
}
@media(max-width:600px) {
  .course-content-panel,.course-file-group {
    padding:23px
  }
  .course-gallery-grid {
    grid-template-columns:1fr
  }
  .course-gallery-grid img {
    height:230px
  }
}