/* Books by Age Section */
.books-by-age-section {
  padding: 4rem 2rem;
  background: #fff;
  position: relative;
}

.books-by-age-section .container {
  max-width: 1400px;
  margin: 0 auto;
}

/* Section Header */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

.section-title {
  font-family: 'Roboto Slab', serif;
  font-size: 36px;
  font-weight: 700;
  color: #2C3E50;
  margin-bottom: 0.5rem;
  margin-top: 0;
}

.section-subtitle {
  font-family: 'Roboto Slab', serif;
  font-size: 20px;
  font-weight: 400;
  color: #7F8C8D;
  margin: 0;
}

/* Age Group Selectors */
.age-group-selectors {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 4rem;
  max-width: 1200px;
  margin: 0 auto 4rem;
  padding: 0 2rem;
  flex-wrap: wrap;
}

.age-group-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.age-group-item:hover {
  transform: translateY(-5px);
}

.age-group-item.active .age-avatar {
  border-color: #FF6B6B;
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

/* Age Avatar (Circular) - Bigger size */
.age-avatar {
  width: 157px;
  height: 157px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid #E0E0E0;
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.age-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Age Label */
.age-label {
  font-family: 'Roboto Slab', serif;
  font-size: 18px;
  font-weight: 600;
  color: #333;
}

/* View All Link in Age Selectors */
.age-group-item.view-all-link {
  cursor: default;
}

.age-group-item.view-all-link:hover {
  transform: none;
}

.view-all-btn {
  font-family: 'Roboto Slab', serif;
  font-size: 16px;
  font-weight: 600;
  color: #FF6B6B;
  text-decoration: underline;
  transition: color 0.3s ease;
}

.view-all-btn:hover {
  color: #FF5252;
}

/* Books Subsection */
.books-subsection {
  margin-bottom: 3rem;
  transition: all 0.3s ease;
}

.subsection-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #E8E8E8;
}

.subsection-title {
  font-family: 'Roboto Slab', serif;
  font-size: 26px;
  font-weight: 600;
  color: #2C3E50;
  margin: 0;
}

.view-all-link {
  font-family: 'Roboto Slab', serif;
  font-size: 16px;
  font-weight: 500;
  color: #FF6B6B;
  text-decoration: none;
  transition: color 0.3s ease;
}

.view-all-link:hover {
  color: #FF5252;
  text-decoration: underline;
}

/* Books Grid */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 2rem;
}

.book-card {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.book-card:hover {
  transform: translateY(-5px);
}

.book-card-title {
  font-family: 'Roboto Slab', serif;
  font-size: 16px;
  font-weight: 600;
  color: #333;
  margin-top: 0.8rem;
  text-align: center;
  line-height: 1.3;
  max-height: 2.6em;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.book-cover {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  transition: box-shadow 0.3s ease;
}

.book-card:hover .book-cover {
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.book-cover-placeholder {
  width: 100%;
  height: 300px;
  background: #E0E0E0;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #999;
  font-family: 'Roboto Slab', serif;
}

.no-books {
  text-align: center;
  font-family: 'Roboto Slab', serif;
  color: #999;
  padding: 2rem;
}

/* Age Filtered Section (initially hidden) */
.books-subsection.age-filtered {
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 768px) {
  .books-by-age-section {
    padding: 2rem 1rem;
  }

  .age-group-selectors {
    padding: 0 1rem;
  }

  .age-avatar {
    width: 110px;
    height: 110px;
  }

  .age-label {
    font-size: 16px;
  }

  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
  }

  .book-cover {
    height: 220px;
  }

  .subsection-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}