/* Course Hero Section */
.course-hero {
  padding: 6rem 0;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
}

.course-hero-content {
  display: flex;
  gap: 4rem;
  align-items: center;
}

.course-hero-text {
  flex: 1;
}

.course-hero-text h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: white;
}

.course-subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: rgba(255, 255, 255, 0.9);
}

.course-highlights {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 1rem;
  border-radius: var(--radius);
}

.highlight-item i {
  font-size: 1.5rem;
  color: var(--accent-color);
}

.course-hero-image {
  flex: 1;
  display: flex;
  justify-content: center;
}

.course-hero-image img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

/* Course Overview Section */
.course-overview {
  padding: 6rem 0;
  background-color: var(--background-color);
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.overview-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px var(--shadow-color);
  transition: var(--transition);
  text-align: center;
}

.overview-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px var(--shadow-color);
}

.overview-icon {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
}

/* Curriculum Section */
.curriculum-section {
  padding: 6rem 0;
  background-color: var(--background-color);
}

.curriculum-grid {
  display: grid;
  gap: 2rem;
  margin-bottom: 2rem;
}

.session-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px var(--shadow-color);
  overflow: hidden;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.session-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px var(--shadow-color);
}

.session-header {
  background: var(--primary-color);
  color: white;
  padding: 1.5rem;
  position: relative;
}

.session-header h3 {
  margin: 0;
  padding-right: 4rem;
  color: white;
}

.session-number {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--accent-color);
  padding: 0.25rem 0.75rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.session-content {
  padding: 1.5rem;
}

.session-topics {
  list-style: none;
  padding: 0;
  margin: 0;
}

.session-topics li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
}

.session-topics li:last-child {
  border-bottom: none;
}

.session-topics i {
  color: var(--secondary-color);
  margin-top: 0.25rem;
}

.session-topics i.fa-star {
  color: var(--accent-color);
}

.show-more-container {
  text-align: center;
  margin-top: 2rem;
}

#show-more-sessions {
  padding: 1rem 2rem;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

#show-more-sessions i {
  transition: transform 0.3s ease;
}

#show-more-sessions:hover i {
  transform: translateY(3px);
}

/* Materials Section */
.materials-section {
  padding: 6rem 0;
  background-color: var(--background-color);
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.material-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px var(--shadow-color);
}

.material-icon {
  font-size: 2.5rem;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  text-align: center;
}

.material-list {
  list-style: none;
  padding: 0;
}

.material-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.material-list li:last-child {
  border-bottom: none;
}

/* Skills Section */
.skills-gained-section {
  padding: 6rem 0;
  background: linear-gradient(135deg, #f0f8ff 0%, #e6f2ff 100%);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.skill-badge {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: 0 4px 6px var(--shadow-color);
  transition: var(--transition);
}

.skill-badge:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px var(--shadow-color);
}

.skill-badge i {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.skill-badge span {
  display: block;
  font-weight: 600;
  color: var(--text-color);
}

/* Course Enrollment Section */
.course-enrollment-section {
  padding: 6rem 0;
  background-color: #f8f9fa;
}

.enrollment-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
}

.enrollment-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 4px 6px var(--shadow-color);
}

.course-details-list {
  list-style: none;
  padding: 0;
}

.course-details-list li {
  display: flex;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
}

.course-details-list li:last-child {
  border-bottom: none;
}

.course-details-list i {
  color: var(--primary-color);
  font-size: 1.5rem;
  margin-top: 0.25rem;
}

.course-details-list h4 {
  margin-bottom: 0.25rem;
  color: var(--text-color);
}

.course-details-list p {
  margin: 0;
  color: var(--text-muted);
}

/* Responsive Styles */
@media (max-width: 992px) {
  .course-hero-content {
    flex-direction: column;
  }

  .course-hero-text h1 {
    font-size: 2.5rem;
  }

  .enrollment-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .course-highlights {
    grid-template-columns: 1fr;
  }

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

@media (min-width: 768px) {
  .curriculum-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1024px) {
  .curriculum-grid {
    grid-template-columns: 1fr;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* Animation Classes */
.fade-in {
  animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Sub-topics styling */
.sub-topics {
  list-style: none;
  padding-left: 2rem;
  margin: 0.5rem 0;
}

.sub-topics li {
  font-size: 0.9rem;
  padding: 0.25rem 0;
  border-bottom: none !important;
  color: var(--text-muted);
}

.sub-topics i {
  font-size: 0.8rem;
  color: var(--text-muted) !important;
}