.course-hero {
  background: linear-gradient(135deg, rgba(92, 51, 246, 0.07), rgba(92, 51, 246, 0.02));
  border-bottom: 1.5px solid var(--border);
  padding: 48px 0 36px;
}

.course-hero-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 44px;
  align-items: start;
}

.sticky-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 26px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}

.module-item {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 9px;
  overflow: hidden;
  transition: border-color var(--transition);
}

.module-item:hover {
  border-color: var(--primary);
}

.module-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--surface);
  user-select: none;
  cursor: pointer;
}

.module-header.open {
  background: var(--primary-faint);
}

.module-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.module-num.done {
  background: var(--green);
  color: #fff;
}

.module-num.active {
  background: var(--primary);
  color: #fff;
}

.module-num.locked {
  background: var(--border);
  color: var(--slate);
}

.module-num.pending {
  background: var(--primary-faint);
  color: var(--primary);
}

.module-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--navy);
  flex: 1;
}

.module-status {
  font-size: 0.76rem;
  font-weight: 700;
  white-space: nowrap;
}

.module-status.done {
  color: var(--green-dark);
}

.module-status.active {
  color: var(--primary);
}

.module-status.locked {
  color: var(--slate);
}

.module-quizzes {
  display: none;
  padding: 0 16px 12px 60px;
  flex-direction: column;
  gap: 5px;
}

.module-quizzes.open {
  display: flex;
}

.quiz-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-size: 0.82rem;
  color: var(--navy);
  transition: all var(--transition);
}

.quiz-item:hover {
  background: var(--primary-faint);
}

.qi-score {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--primary);
  font-weight: 700;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  font-size: 0.84rem;
  color: var(--slate);
  margin-bottom: 5px;
}

.checklist-item::before {
  content: "✓";
  color: var(--green-dark);
  font-weight: 700;
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .course-hero-grid {
    grid-template-columns: 1fr;
  }

  .sticky-card {
    position: static;
  }
}

/* Content Main */
.content-main {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: start;
}

@media (min-width: 768px) {
  .content-main {
    grid-template-columns: 7fr 3fr;
    gap: 40px;
  }
}