:root {
  --lesson-shell: min(1180px, calc(100% - 2.2rem));
}

.subpage-main {
  padding: 7.5rem 0 5rem;
}

.subpage-shell {
  width: var(--lesson-shell);
  margin: 0 auto;
}

.subhero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(18rem, 1.08fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  margin-bottom: 2rem;
}

.subhero-copy p,
.subhero-copy li,
.lesson-card p,
.lesson-detail-copy p,
.curriculum-card p,
.lesson-outcomes li,
.lesson-nav-card p {
  color: var(--muted);
  line-height: 1.8;
}

.subhero-copy h1,
.lesson-detail-copy h1 {
  max-width: none;
  margin-bottom: 1rem;
  font-size: clamp(2.8rem, 6vw, 5.2rem);
}

.subhero-copy .hero-lede {
  max-width: 42rem;
}

.subhero-panel,
.lesson-card,
.curriculum-card,
.lesson-detail-card,
.lesson-nav-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.subhero-panel {
  padding: 1.2rem;
  background:
    linear-gradient(145deg, rgba(124, 92, 255, 0.2), rgba(85, 214, 167, 0.07)),
    rgba(24, 24, 36, 0.86);
}

.subhero-art {
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 0.9rem;
  background: rgba(8, 10, 22, 0.56);
}

.subhero-art img,
.lesson-cover img,
.lesson-detail-preview img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.subhero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1rem;
}

.subhero-points span,
.lesson-tags span,
.lesson-outcomes li {
  padding: 0.48rem 0.75rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.lesson-index {
  margin-top: 3rem;
}

.lesson-table {
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow);
}

.lesson-table-head,
.lesson-row {
  display: grid;
  grid-template-columns: 10rem minmax(16rem, 1.2fr) minmax(20rem, 1.7fr) minmax(12rem, 1fr) 8rem;
  gap: 1rem;
  align-items: center;
  padding: 1rem 1.2rem;
}

.lesson-table-head {
  color: var(--soft);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--line);
}

.lesson-row + .lesson-row {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.lesson-row:hover {
  background: rgba(255, 255, 255, 0.02);
}

.lesson-row-index {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.lesson-row-index strong {
  min-width: 2ch;
  color: var(--mint);
  font-size: 1.1rem;
}

.lesson-row-index img {
  display: block;
  width: 5rem;
  height: 3.2rem;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 5px;
  background: rgba(8, 10, 22, 0.56);
}

.lesson-row-title {
  display: grid;
  gap: 0.4rem;
}

.lesson-row-summary {
  margin: 0;
}

.lesson-number {
  color: var(--mint);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lesson-row-title h3,
.lesson-detail-copy h2 {
  margin: 0;
}

.lesson-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.lesson-tags span {
  color: #ddd5f4;
  font-size: 0.82rem;
}

.lesson-link,
.back-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: max-content;
  min-height: 2.5rem;
  padding: 0 1rem;
  color: var(--text);
  font-weight: 700;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.lesson-link:hover,
.back-link:hover {
  background: rgba(159, 122, 234, 0.14);
  border-color: rgba(159, 122, 234, 0.32);
}

.lesson-detail {
  display: grid;
  gap: 1.4rem;
}

.lesson-detail-card {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1.1fr);
  gap: 1.25rem;
  padding: 1.2rem;
}

.lesson-detail-copy {
  display: grid;
  align-content: center;
}

.lesson-detail-copy .eyebrow {
  margin-bottom: 0.8rem;
}

.lesson-detail-preview {
  overflow: hidden;
  min-height: 22rem;
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 1rem;
  background: rgba(8, 10, 22, 0.56);
}

.lesson-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.25rem;
}

.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.curriculum-card {
  padding: 1.2rem;
}

.curriculum-card strong {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--text);
  font-size: 1.02rem;
}

.lesson-outcomes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.lesson-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.lesson-nav-card {
  padding: 1.2rem;
}

.lesson-nav-card small {
  color: var(--soft);
  font-weight: 700;
}

.lesson-nav-card strong {
  display: block;
  margin: 0.55rem 0;
  font-size: 1.1rem;
}

@media (max-width: 980px) {
  .subhero,
  .lesson-detail-card,
  .curriculum-grid,
  .lesson-nav {
    grid-template-columns: 1fr;
  }

  .lesson-table-head {
    display: none;
  }

  .lesson-row {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .lesson-row-index {
    align-items: flex-start;
  }

  .lesson-row-index img {
    width: 6rem;
    height: 3.75rem;
  }

  .lesson-link {
    width: 100%;
  }
}

@media (max-width: 760px) {
  .subpage-main {
    padding-top: 6.5rem;
  }
}