/* Root variables */
:root {
  --course-card-shadow: 0 10px 40px rgba(var(--bs-dark-rgb), 0.08);
  --course-card-hover-shadow: 0 20px 60px rgba(var(--bs-dark-rgb), 0.15);
  --animation-duration: 0.4s;
  --animation-timing: cubic-bezier(0.4, 0.0, 0.2, 1);
  --radius-lg: 20px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
}

[data-bs-theme="dark"] {
  --course-card-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  --course-card-hover-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* Typography */
.hero-title,
.course-title,
.btn-modern,
.modern-search-input,
.modern-select {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  letter-spacing: -0.01em;
}

/* ===== HERO SECTION ===== */
.courses-hero-section {
  background: linear-gradient(135deg, 
    rgba(var(--bs-primary-rgb), 0.05) 0%, 
    rgba(var(--bs-secondary-rgb), 0.05) 100%);
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(var(--bs-primary-rgb), 0.1);
  color: var(--bs-primary);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid rgba(var(--bs-primary-rgb), 0.2);
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--bs-emphasis-color);
}

.title-main {
  display: block;
}

.title-highlight {
  display: block;
  background: linear-gradient(135deg, var(--bs-primary) 0%, var(--bs-secondary) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--bs-secondary-color);
  line-height: 1.6;
}

/* ===== SEARCH & FILTERS ===== */
.search-filters-section {
  /* No animation for better performance */
}

.search-card {
  background: var(--bs-body-bg);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 4px 12px rgba(var(--bs-dark-rgb), 0.08);
  border: 1px solid var(--bs-border-color);
}

.search-input-wrapper {
  position: relative;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--bs-secondary-color);
  font-size: 1.1rem;
  z-index: 2;
}

.modern-search-input {
  border: 1px solid var(--bs-border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  background: var(--bs-body-bg);
  color: var(--bs-body-color);
  transition: all 0.2s ease;
}

.modern-search-input:focus {
  border-color: var(--bs-primary);
  box-shadow: 0 0 0 4px rgba(var(--bs-primary-rgb), 0.1);
  outline: none;
}

.modern-select {
  border: 1px solid var(--bs-border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  background: var(--bs-body-bg);
  color: var(--bs-body-color);
  transition: all 0.2s ease;
}

.modern-select:focus {
  border-color: var(--bs-primary);
  box-shadow: 0 0 0 4px rgba(var(--bs-primary-rgb), 0.1);
  outline: none;
}

/* ===== MODERN BUTTONS ===== */
.btn-modern {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all 0.2s ease;
  overflow: hidden;
}


.btn-modern.btn-primary {
  background: var(--bs-primary);
  color: white;
  box-shadow: 0 2px 8px rgba(var(--bs-primary-rgb), 0.2);
}

.btn-modern.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(var(--bs-primary-rgb), 0.3);
  color: white;
  text-decoration: none;
  background: var(--bs-primary-600);
}

.btn-modern.btn-outline {
  background: transparent;
  color: var(--bs-primary);
  border: 2px solid var(--bs-primary);
}

.btn-modern.btn-outline:hover {
  background: var(--bs-primary);
  color: white;
  transform: translateY(-2px);
  text-decoration: none;
}


/* ===== COURSE CARDS ===== */
.courses-grid {
  /* No animation for better performance */
}

.course-card {
  background: var(--bs-body-bg);
  border-radius: var(--radius-md);
  padding: 0;
  height: 100%;
  box-shadow: 0 4px 12px rgba(var(--bs-dark-rgb), 0.08);
  border: 1px solid var(--bs-border-color);
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}


.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(var(--bs-dark-rgb), 0.12);
}

/* Course Image */
.course-image-container {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  height: 160px;
  background: linear-gradient(135deg, var(--bs-primary-100) 0%, var(--bs-secondary-100) 100%);
}

.course-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--animation-timing);
}


.course-image-fallback {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: linear-gradient(135deg, var(--bs-primary-100) 0%, var(--bs-secondary-100) 100%);
  color: var(--bs-primary);
}

.fallback-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: rgba(var(--bs-primary-rgb), 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.fallback-icon i {
  font-size: 1.5rem;
  color: var(--bs-primary);
}

.fallback-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--bs-primary);
}

/* Badges */
.category-badge-wrapper {
  position: absolute;
  top: 1rem;
  left: 1rem;
  z-index: 10;
}

/* Контекст для обрезки эффектов внутри карточки */
.course-card {
  isolation: isolate;
}

.category-badge {
  background: rgba(255, 255, 255, 0.9);
  color: var(--bs-dark);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  background-clip: padding-box;
}

.difficulty-badge-wrapper {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 10;
}

.difficulty-badge {
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  color: white;
}

.badge-beginner { background: linear-gradient(135deg, var(--bs-green) 0%, #059669 100%); }
.badge-intermediate { background: linear-gradient(135deg, var(--bs-primary) 0%, var(--bs-primary-600) 100%); }
.badge-advanced { background: linear-gradient(135deg, var(--bs-yellow) 0%, #CA8A04 100%); color: var(--bs-dark) !important; }
.badge-expert { background: linear-gradient(135deg, var(--bs-red) 0%, #DC2626 100%); }

/* Course Content */
.course-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  height: calc(100% - 160px);
}

.course-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--bs-emphasis-color);
  line-height: 1.3;
  margin-bottom: 0.75rem;
  transition: color 0.3s ease;
}

.course-card:hover .course-title {
  color: var(--bs-primary);
}

.course-description {
  color: var(--bs-secondary-color);
  line-height: 1.5;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  flex-grow: 1;
}

/* Course Stats */
.course-stats {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 1rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--bs-border-color-translucent);
  gap: 0.75rem;
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-align: left;
  color: var(--bs-secondary-color);
  font-size: 0.8rem;
  font-weight: 500;
}

.stat-item i {
  color: var(--bs-primary);
  font-size: 0.9rem;
  flex-shrink: 0;
}

.stat-item span {
  white-space: nowrap;
  color: var(--bs-body-color);
}

.stat-number {
  font-weight: 600;
  color: var(--bs-emphasis-color);
}

.stat-divider {
  width: 1px;
  height: 12px;
  background: var(--bs-border-color);
  flex-shrink: 0;
}

/* Course Button */
.course-btn {
  margin-top: auto;
}

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  max-width: 500px;
  margin: 0 auto;
}

.empty-state-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(var(--bs-primary-rgb), 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 2rem;
}

.empty-state-icon i {
  font-size: 2.5rem;
  color: var(--bs-primary);
}

.empty-state-title {
  color: var(--bs-emphasis-color);
  font-weight: 600;
  margin-bottom: 1rem;
}

.empty-state-description {
  color: var(--bs-secondary-color);
  line-height: 1.6;
  margin-bottom: 2rem;
}

/* ===== PAGINATION ===== */
.modern-pagination-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 3rem;
}

.pagination-list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.pagination-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 500;
  color: var(--bs-body-color);
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color);
  transition: all 0.3s ease;
}

.pagination-link:hover {
  background: var(--bs-primary);
  color: white;
  border-color: var(--bs-primary);
  transform: translateY(-2px);
  text-decoration: none;
}

.pagination-current {
  background: var(--bs-primary);
  color: white;
  border-color: var(--bs-primary);
  cursor: default;
  border-radius: var(--radius-sm);
}

.pagination-prev,
.pagination-next {
  font-weight: 600;
}

/* ===== SIMPLIFIED ANIMATIONS ===== */
.course-card {
  opacity: 1;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .search-card {
    padding: 1rem;
    border-radius: var(--radius-md);
  }
  
  .course-content {
    padding: 1rem;
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
  }
  
  .course-image-container {
    height: 140px;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
  }
  
  .course-title {
    font-size: 1rem;
    margin-bottom: 0.5rem;
  }
  
  .course-description {
    margin-bottom: 0.75rem;
    -webkit-line-clamp: 1;
  }
  
  .course-stats {
    padding: 0.5rem 0;
    margin-bottom: 0.75rem;
    gap: 0.5rem;
  }
  
  .stat-item {
    font-size: 0.75rem;
  }

  .stat-divider {
    height: 10px;
  }
  
  .btn-modern {
    padding: 1rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
  }
  
  .pagination-link {
    padding: 0.5rem 0.7rem;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 1.6rem;
  }
  
  .search-card {
    padding: 0.75rem;
    border-radius: var(--radius-md);
  }
  
  .course-content {
    padding: 0.75rem;
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
  }
  
  .course-image-container {
    height: 120px;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
  }
  
  .course-title {
    font-size: 0.95rem;
  }
  
  .course-description {
    font-size: 0.8rem;
  }
  
  .course-stats {
    gap: 0.4rem;
    padding: 0.5rem 0;
    flex-wrap: wrap;
  }
  
  .stat-item {
    font-size: 0.7rem;
  }

  .stat-item i {
    font-size: 0.8rem;
  }
  
  .stat-divider {
    display: none;
  }

  .btn-modern {
    padding: 1.1rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
  }
  
  .pagination-prev span,
  .pagination-next span {
    display: none;
  }
}

/* ===== MOBILE TOUCH OPTIMIZATION ===== */
@media (hover: none) and (pointer: coarse) {
  .btn-modern {
    min-height: 48px;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    font-weight: 600;
  }
  
  .course-btn {
    margin-top: 1rem;
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  .course-card:hover {
    transform: none;
  }
  
  .btn-modern:hover {
    transform: none;
  }
}

/* Focus styles for keyboard navigation */
.course-card:focus-within {
  outline: 3px solid var(--bs-primary);
  outline-offset: 2px;
}

.modern-search-input:focus,
.modern-select:focus,
.btn-modern:focus,
.pagination-link:focus {
  outline: 2px solid var(--bs-primary);
  outline-offset: 2px;
}

/* Performance optimizations */
.course-card .course-image,
.btn-modern,
.pagination-link {
  will-change: transform;
}