/* ============================================
   Adventure AI Academy - Component Styles
   Reusable UI components
   ============================================ */

/* Course Card */
.course-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  cursor: pointer;
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.course-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--gradient-primary);
}

.course-card-body {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.course-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.course-card-category {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--purple);
  letter-spacing: 0.05em;
}

.course-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-900);
  line-height: 1.3;
}

.course-card-description {
  font-size: 0.9rem;
  color: var(--gray-600);
  margin-bottom: var(--spacing-lg);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--gray-100);
}

.course-card-meta {
  display: flex;
  gap: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--gray-500);
}

.course-card-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.course-card-meta-item svg {
  width: 16px;
  height: 16px;
}

/* Feature Card */
.feature-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  border: 1px solid var(--gray-200);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--purple);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg);
  font-size: 2rem;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.feature-description {
  color: var(--gray-600);
  line-height: 1.6;
}

/* Stat Card */
.stat-card {
  background: var(--gradient-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  color: var(--white);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: 1rem;
  opacity: 0.9;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: var(--spacing-lg);
}

.breadcrumb-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.breadcrumb-item:not(:last-child)::after {
  content: '/';
  color: var(--gray-400);
}

.breadcrumb-link {
  color: var(--gray-600);
  transition: color var(--transition-base);
}

.breadcrumb-link:hover {
  color: var(--purple);
}

/* Search Bar */
.search-bar {
  position: relative;
  width: 100%;
  max-width: 600px;
}

.search-input {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 3rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-full);
  font-size: 1rem;
  transition: all var(--transition-base);
  background: var(--white);
}

.search-input:focus {
  outline: none;
  border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  pointer-events: none;
}

/* Filter Bar */
.filter-bar {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-2xl);
}

.filter-button {
  padding: 0.5rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-full);
  background: var(--white);
  color: var(--gray-700);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
}

.filter-button:hover {
  border-color: var(--purple);
  color: var(--purple);
}

.filter-button.active {
  background: var(--gradient-primary);
  color: var(--white);
  border-color: transparent;
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--spacing-lg);
  border-bottom: 2px solid var(--gray-200);
  margin-bottom: var(--spacing-xl);
}

.tab {
  padding: var(--spacing-md) var(--spacing-lg);
  font-weight: 600;
  color: var(--gray-600);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition-base);
}

.tab:hover {
  color: var(--purple);
}

.tab.active {
  color: var(--purple);
  border-bottom-color: var(--purple);
}

/* Alert/Notice */
.alert {
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid;
  margin-bottom: var(--spacing-lg);
}

.alert-info {
  background: #eff6ff;
  border-color: #3b82f6;
  color: #1e40af;
}

.alert-success {
  background: #f0fdf4;
  border-color: #22c55e;
  color: #166534;
}

.alert-warning {
  background: #fffbeb;
  border-color: #f59e0b;
  color: #92400e;
}

.alert-error {
  background: #fef2f2;
  border-color: #ef4444;
  color: #991b1b;
}

/* Progress Bar */
.progress {
  width: 100%;
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  transition: width var(--transition-slow);
}

/* Instructor Card */
.instructor-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--gray-50);
  border-radius: var(--radius-lg);
}

.instructor-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--white);
  box-shadow: var(--shadow-md);
}

.instructor-info h4 {
  margin-bottom: var(--spacing-xs);
  color: var(--gray-900);
}

.instructor-role {
  font-size: 0.875rem;
  color: var(--purple);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.instructor-bio {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.5;
}

/* Lesson List */
.lesson-list {
  list-style: none;
}

.lesson-item {
  padding: var(--spacing-lg);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition-base);
  cursor: pointer;
}

.lesson-item:hover {
  border-color: var(--purple);
  box-shadow: var(--shadow-md);
}

.lesson-item-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.lesson-number {
  width: 40px;
  height: 40px;
  background: var(--gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--gray-600);
}

.lesson-item.preview .lesson-number {
  background: var(--gradient-primary);
  color: var(--white);
}

.lesson-info h4 {
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--gray-900);
}

.lesson-meta {
  font-size: 0.875rem;
  color: var(--gray-500);
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.lesson-duration {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.lesson-type-badge {
  font-size: 0.75rem;
  padding: 0.125rem 0.5rem;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  font-weight: 600;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.empty-state-icon {
  font-size: 4rem;
  color: var(--gray-300);
  margin-bottom: var(--spacing-lg);
}

.empty-state h3 {
  color: var(--gray-600);
  margin-bottom: var(--spacing-md);
}

.empty-state p {
  color: var(--gray-500);
  max-width: 400px;
  margin: 0 auto var(--spacing-lg);
}

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 1rem;
  margin-bottom: var(--spacing-sm);
}

.skeleton-title {
  height: 2rem;
  width: 60%;
  margin-bottom: var(--spacing-lg);
}

.skeleton-card {
  height: 300px;
}

/* Pricing Card */
.pricing-card {
  background: var(--white);
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-base);
}

.pricing-card.featured {
  border-color: var(--purple);
  box-shadow: var(--shadow-xl);
  transform: scale(1.05);
}

.pricing-card:hover {
  box-shadow: var(--shadow-lg);
}

.pricing-name {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.pricing-price {
  font-size: 3rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.pricing-period {
  color: var(--gray-500);
  margin-bottom: var(--spacing-xl);
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: var(--spacing-xl);
}

.pricing-features li {
  padding: var(--spacing-sm) 0;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.pricing-features li::before {
  content: '✓';
  color: var(--purple);
  font-weight: 700;
}

/* Testimonial Card */
.testimonial-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--gray-200);
}

.testimonial-text {
  font-size: 1.125rem;
  color: var(--gray-700);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
}

.testimonial-info h5 {
  font-size: 1rem;
  margin-bottom: var(--spacing-xs);
  color: var(--gray-900);
}

.testimonial-role {
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .course-card-image {
    height: 160px;
  }
  
  .instructor-card {
    flex-direction: column;
    text-align: center;
  }
  
  .lesson-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .filter-bar {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--spacing-sm);
  }
}