.lesson-emblem {
  position: relative;
  display: grid;
  place-items: center;
  justify-self: end;
  width: min(100%, 360px);
  aspect-ratio: 1;
  overflow: hidden;
  background:
    radial-gradient(circle at 52% 40%, rgba(241, 215, 157, .13), transparent 43%),
    linear-gradient(145deg, var(--bg-elevated), var(--bg-card));
  border: 1px solid rgba(212, 160, 84, .22);
  border-radius: 50%;
  box-shadow: var(--shadow);
}

.lesson-emblem::before {
  content: '';
  position: absolute;
  inset: 16px;
  border: 1px solid rgba(212, 160, 84, .12);
  border-radius: 50%;
}

.lesson-emblem span {
  position: relative;
  z-index: 1;
  display: block;
  font-size: clamp(5.4rem, 12vw, 8.6rem);
  line-height: 1;
  filter: saturate(.76) drop-shadow(0 18px 28px rgba(0, 0, 0, .28));
}

.lesson-emblem small {
  position: absolute;
  z-index: 1;
  inset: auto 24px 56px;
  color: var(--accent-light);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .18em;
  text-align: center;
  text-transform: uppercase;
}

.topic-grid,
.course-link-grid,
.instructor-grid {
  display: grid;
  gap: 22px;
  margin-top: 48px;
}

.topic-grid { grid-template-columns: repeat(3, 1fr); }
.course-link-grid { grid-template-columns: repeat(3, 1fr); }
.instructor-grid { grid-template-columns: repeat(2, 1fr); }

.topic-card,
.course-link,
.instructor-card {
  position: relative;
  min-height: 100%;
  padding: 30px;
  color: var(--text);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.topic-card h3,
.course-link h3,
.instructor-card h2,
.instructor-card h3 {
  margin-bottom: 12px;
  font-size: 1.42rem;
  line-height: 1.25;
}

.topic-card p,
.course-link p,
.instructor-card p,
.instructor-card li {
  color: var(--text-secondary);
  font-size: .94rem;
}

.topic-number,
.profile-icon {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 22px;
  color: var(--accent-light);
  background: var(--accent-dim);
  border: 1px solid rgba(212, 160, 84, .18);
  border-radius: 50%;
  font-size: 1.25rem;
  font-weight: 700;
}

.course-link {
  display: block;
  min-height: 190px;
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, background-color .2s ease;
}

.course-link:hover {
  background: var(--bg-elevated);
  border-color: rgba(212, 160, 84, .34);
  transform: translateY(-4px);
}

.course-link .link-label {
  display: inline-block;
  margin-top: 22px;
  color: var(--accent-light);
  font-size: .82rem;
  font-weight: 700;
}

.instructor-card {
  padding: 34px;
  overflow: hidden;
}

.instructor-card::after {
  content: '';
  position: absolute;
  width: 180px;
  height: 180px;
  right: -92px;
  bottom: -108px;
  background: var(--accent-dim);
  border-radius: 50%;
  pointer-events: none;
}

.instructor-card.featured { border-color: rgba(212, 160, 84, .26); }
.profile-role { margin-bottom: 6px; color: var(--accent); font-size: .76rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.profile-meta { margin-bottom: 24px; color: var(--accent-light) !important; font-size: .82rem !important; font-weight: 600; }

.profile-sections {
  display: grid;
  gap: 18px;
  margin-top: 24px;
}

.profile-sections dt {
  margin-bottom: 4px;
  color: var(--text);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.profile-sections dd { color: var(--text-secondary); font-size: .92rem; }

.language-note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.language-note span {
  padding: 6px 11px;
  color: var(--accent-light);
  background: var(--accent-dim);
  border: 1px solid rgba(212, 160, 84, .15);
  border-radius: 999px;
  font-size: .74rem;
  font-weight: 700;
}

.zh-course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 44px;
}

.zh-course-grid .course-link { min-height: 210px; }

.nav-language-link {
  color: var(--accent-light);
  font-size: .8rem;
  font-weight: 700;
  text-decoration: none;
}

.mobile-toggle > span {
  display: block;
  font-size: 1.45rem;
  line-height: 1;
}

.compact-profile { margin-top: 38px; }
.compact-profile .instructor-card { min-height: auto; }

@media (max-width: 900px) {
  .lesson-emblem {
    justify-self: center;
    width: min(68vw, 290px);
  }

  .topic-grid,
  .course-link-grid,
  .zh-course-grid { grid-template-columns: repeat(2, 1fr); }

  .instructor-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .topic-grid,
  .course-link-grid,
  .zh-course-grid { grid-template-columns: 1fr; }

  .lesson-emblem { width: min(78vw, 260px); }
  .lesson-emblem small { bottom: 38px; }
  .instructor-card { padding: 28px; }
}

@media (prefers-reduced-motion: reduce) {
  .course-link { transition-duration: .01ms !important; }
}