/* ====================================================================
   BIONUL EDTECH PLATFORM - COURSES CATALOG STYLES
   css/courses.css (Dedicated to courses.html)
   ==================================================================== */

/* --- Search Bar with Filter Control --- */
.search-bar-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
  margin-bottom: 16px;
}

.search-input-field {
  width: 100%;
  height: 48px;
  padding: 0 46px 0 44px;
  background-color: #FFFFFF;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-heading);
  font-size: 0.92rem;
  font-family: inherit;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.search-input-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3.5px rgba(91, 61, 245, 0.12);
  background-color: #FFFFFF;
}

.search-icon-left {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--text-light);
  pointer-events: none;
}

.search-filter-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-xs);
  transition: color var(--transition-fast);
}

.search-filter-btn:hover {
  color: var(--primary);
}

/* --- Horizontally Scrollable Category Pills --- */
.category-pills-scroll {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  margin-bottom: 22px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.category-pills-scroll::-webkit-scrollbar {
  display: none;
}

.category-pill {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  white-space: nowrap;
  background-color: #FFFFFF;
  color: var(--text-body);
  border: 1.5px solid var(--border-color);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-pill:hover {
  border-color: var(--primary-border);
  color: var(--primary);
}

.category-pill.active {
  background-color: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(91, 61, 245, 0.3);
}

/* --- Featured Course Hero Card --- */
.featured-course-card {
  background: var(--hero-card-gradient);
  border-radius: var(--radius-xl);
  padding: 22px 20px;
  color: #FFFFFF;
  box-shadow: var(--shadow-hero);
  position: relative;
  overflow: hidden;
  margin-bottom: 26px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
}

.featured-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 8px;
}

.featured-title {
  font-size: 1.45rem;
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.22;
  margin-bottom: 6px;
}

.featured-desc {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 18px;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.featured-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  background-color: #FFFFFF;
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: transform var(--transition-fast);
}

.featured-cta-btn:hover {
  transform: translateY(-1px);
}

.featured-science-art {
  width: 110px;
  height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* ====================================================================
   VERTICAL COURSE CARDS (PhysicsWallah / Modern EdTech Design)
   ==================================================================== */
.course-list-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}

@media (min-width: 640px) {
  .course-list-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 22px;
  }
}

.vertical-course-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.vertical-course-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(91, 61, 245, 0.12);
  border-color: var(--primary-border);
}

/* 16:9 Thumbnail Header */
.v-card-thumb-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 220px;
  background-color: #0F172A;
  overflow: hidden;
}

.v-card-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}

.vertical-course-card:hover .v-card-thumb-img {
  transform: scale(1.03);
}

/* Overlay Badges */
.v-card-top-badges {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: none;
}

.v-badge-online {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  color: #FFFFFF;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.v-badge-status {
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.v-badge-enrolled {
  background: #10B981;
  color: #FFFFFF;
}

.v-badge-pending {
  background: #F59E0B;
  color: #FFFFFF;
}

.v-badge-free {
  background: linear-gradient(135deg, #10B981, #059669);
  color: #FFFFFF;
}

/* Card Body */
.v-card-body {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.v-card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.v-card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.35;
  margin: 0 0 10px 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.v-card-title a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.v-card-title a:hover {
  color: var(--primary);
}

/* Info Strip (Teacher + Chapters + Duration) */
.v-card-info-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-subtle);
}

.v-teacher-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-heading);
}

.v-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Price Section */
.v-card-price-section {
  margin-bottom: 14px;
}

.v-price-wrapper {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.v-price-main {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--text-heading);
  letter-spacing: -0.02em;
}

.v-price-main.free {
  color: #10B981;
}

.v-price-strike {
  font-size: 0.88rem;
  color: var(--text-light);
  text-decoration: line-through;
  font-weight: 600;
}

.v-price-discount {
  font-size: 0.75rem;
  font-weight: 800;
  background: #ECFDF5;
  color: #059669;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.v-price-enrolled {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 800;
  color: #10B981;
}

.v-price-pending {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #D97706;
}

/* Action Buttons */
.v-card-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
}

.v-btn-explore {
  flex: 1;
  text-align: center;
  font-size: 0.86rem;
  font-weight: 700;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-color);
  color: var(--text-heading);
  text-decoration: none;
  background: #FFFFFF;
  transition: all var(--transition-fast);
}

.v-btn-explore:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--pastel-purple);
}

.v-btn-action {
  flex: 1.25;
  text-align: center;
  font-size: 0.86rem;
  font-weight: 800;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  box-shadow: 0 4px 12px rgba(91, 61, 245, 0.25);
  transition: all var(--transition-fast);
}

.v-btn-action:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(91, 61, 245, 0.35);
}

.btn-warning-outline {
  background: #FEF3C7;
  border: 1.5px solid #F59E0B;
  color: #B45309;
  box-shadow: none;
}

.btn-warning-outline:hover {
  background: #FDE68A;
  color: #92400E;
}

/* Vertical Skeletons */
.vertical-skeleton-card {
  background-color: #FFFFFF;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.skeleton-thumb-169 {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

.vertical-skeleton-body {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* ==========================================
   ENROLLED COURSES DEDICATED STYLES
   ========================================== */
.courses-list-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

@media (min-width: 640px) {
  .courses-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 18px;
  }
}

.enrolled-course-card {
  background-color: var(--surface-card);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.enrolled-course-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(91, 61, 245, 0.1);
  border-color: var(--primary-border);
}

.enrolled-thumb-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 200px;
  background-color: #0F172A;
  overflow: hidden;
}

.enrolled-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.enrolled-badge-overlay {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #10B981;
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.4);
}

.enrolled-badge-pending {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #D97706;
  color: #FFFFFF;
  font-size: 0.72rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 4px;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.4);
}

.enrolled-card-content {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.enrolled-card-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.enrolled-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.35;
  margin: 0 0 8px 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.enrolled-batch-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.76rem;
  color: var(--primary);
  font-weight: 700;
  background: var(--pastel-purple);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 10px;
  align-self: flex-start;
}

.enrolled-teacher-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 14px;
}

.enrolled-card-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}