.course-detail-hero {
  background:
    linear-gradient(180deg, rgba(18, 28, 46, 0.45) 0%, rgba(18, 28, 46, 0.92) 100%),
    var(--bg-image) center/cover;
  padding: 5rem 1.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.course-detail-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 0.85rem;
  background: linear-gradient(135deg, #fff 30%, #b8dcff 70%, #67e8f9 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.course-detail-hero p {
  max-width: 640px;
  margin: 0 auto 1.75rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.package-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.package-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  text-align: center;
  transition: all 0.3s ease;
}

.package-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
}

.package-card.featured {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  position: relative;
}

.package-card.featured::before {
  content: 'Popular';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.85rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.package-card h4 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.package-card .price {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  margin: 0.85rem 0;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.package-card ul {
  list-style: none;
  text-align: left;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.package-card li { margin-bottom: 0.45rem; }
.package-card li::before { content: '✓ '; color: var(--accent); font-weight: 700; }

.curriculum-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  justify-content: center;
}

.curriculum-tab {
  padding: 0.55rem 1.1rem;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.25s;
}

.curriculum-tab.active,
.curriculum-tab:hover {
  background: rgba(27, 74, 156, 0.15);
  border-color: var(--border-glow);
  color: #fff;
}

.instructor-card {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: var(--radius);
  padding: 1.5rem;
  border: 1px solid var(--border);
}

.instructor-card img {
  width: 96px;
  height: 96px;
  border-radius: 20px;
  object-fit: cover;
  border: 2px solid var(--border-glow);
}

@media (max-width: 768px) {
  .course-detail-hero {
    padding: 3.5rem 1rem;
  }

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

  .instructor-card {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .curriculum-tabs {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 0.5rem;
    padding-bottom: 0.35rem;
  }

  .curriculum-tab {
    flex: 0 0 auto;
    white-space: nowrap;
  }
}