/* Enhanced E-Shalla Library CSS */
:root {
  --primary-color: #062bcf;
  --secondary-color: #886acd;
  --accent-color: #212974;
  --dark-color: #14213d;
  --light-color: #ffffff;
  --success-color: #4caf50;
  --warning-color: #ff9800;
  --error-color: #f44336;
  --gray-light: #e9ecef;
  --gray-medium: #adb5bd;
  --gray-dark: #495057;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1), 0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1), 0 5px 10px rgba(0,0,0,0.05);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --border-radius: 8px;
  --sidebar-width: 280px;
}

/* Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--dark-color);
  background-color: #a2a8bf;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.container {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

/* Header */
header {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 10;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  margin-right: 2rem;
  display: flex;
  align-items: center;
  letter-spacing: -0.5px;
}

.logo::before {
  content: "📚";
  margin-right: 0.5rem;
  font-size: 1.5rem;
}

.menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 28px;
  height: 24px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  margin-right: 1rem;
  transition: var(--transition);
}

.menu-btn:hover {
  opacity: 0.8;
}

.menu-btn .bar {
  width: 100%;
  height: 3px;
  background-color: white;
  border-radius: 2px;
  transition: var(--transition);
}

.menu-btn.active .bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-btn.active .bar:nth-child(2) {
  opacity: 0;
}

.menu-btn.active .bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.search-container {
  margin-left: auto;
  display: flex;
  width: 40%;
  max-width: 500px;
}

#search-input {
  flex: 1;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: var(--border-radius) 0 0 var(--border-radius);
  font-size: 0.95rem;
  background-color: rgba(255, 255, 255, 0.9);
  transition: var(--transition);
}

#search-input:focus {
  outline: none;
  background-color: white;
  box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

#search-btn {
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 0 1.5rem;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

#search-btn:hover {
  background-color: #3ab7d8;
}

#search-btn i {
  font-size: 1rem;
}

/* Sidebar */
.sidebar {
  background-color: white;
  padding: 2rem 0;
  box-shadow: var(--shadow-md);
  height: calc(100vh - 70px);
  position: sticky;
  top: 70px;
  overflow-y: auto;
}

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

.categories li a {
  display: flex;
  align-items: center;
  padding: 0.8rem 1.5rem;
  color: var(--gray-dark);
  text-decoration: none;
  margin: 0.25rem 1rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  font-weight: 500;
}

.categories li a::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--gray-medium);
  border-radius: 50%;
  margin-right: 1rem;
  transition: var(--transition);
}

.categories li a:hover {
  background-color: rgba(67, 97, 238, 0.05);
  color: var(--primary-color);
  transform: translateX(3px);
}

.categories li a:hover::before {
  background-color: var(--primary-color);
}

.categories li a.active {
  background-color: rgba(67, 97, 238, 0.1);
  color: var(--primary-color);
  font-weight: 600;
}

.categories li a.active::before {
  background-color: var(--primary-color);
  width: 8px;
  height: 8px;
}

/* Main Content */
.content {
  padding: 2.5rem;
  background-color: #f5f7ff;
}

.section-title {
  font-size: 1.75rem;
  margin-bottom: 2rem;
  color: var(--dark-color);
  position: relative;
  padding-bottom: 0.75rem;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
  border-radius: 2px;
}

/* Books Grid */
.books-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 2rem;
}

.book-card {
  background-color: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
}

.book-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.book-cover {
  height: 280px;
  background-color: var(--gray-light);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.book-cover img {
  width: 80%;
  height: 90%;
  object-fit: contain;
  transition: transform 0.5s ease;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.book-card:hover .book-cover img {
  transform: scale(1.05);
}

.book-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background-color: var(--accent-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.book-info {
  padding: 1.5rem;
}

.book-title {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
  font-weight: 600;
  color: var(--dark-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-author {
  font-size: 0.9rem;
  color: var(--gray-medium);
  margin-bottom: 0.5rem;
}

.book-category {
  display: inline-block;
  font-size: 0.75rem;
  background-color: rgba(67, 97, 238, 0.1);
  color: var(--primary-color);
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  margin-bottom: 1rem;
}

.book-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.download-btn, .read-btn {
  flex: 1;
  padding: 0.75rem;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.download-btn {
  background-color: var(--primary-color);
  color: white;
}

.download-btn:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
}

.read-btn {
  background-color: white;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

.read-btn:hover {
  background-color: rgba(67, 97, 238, 0.05);
  transform: translateY(-2px);
}

/* Empty State */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  color: var(--gray-medium);
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  color: var(--gray-light);
}

.empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--gray-dark);
}

.empty-state p {
  max-width: 500px;
  margin: 0 auto;
}

/* Responsive Design */
@media (max-width: 1200px) {
  .books-container {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.8rem;
  }
}

@media (max-width: 1024px) {
  .books-container {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1.5rem;
  }
  
  .content {
    padding: 2rem;
  }
}

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

  .sidebar {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 280px;
    height: calc(100vh - 70px);
    z-index: 100;
    transition: left 0.3s ease;
    background-color: white;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
  }

  .sidebar.active {
    left: 0;
  }

  /* Remove or replace the overlay if not needed */
  .sidebar.active::before {
    display: none; /* This removes the overlay completely */
  }

  /* Optional: Add a semi-transparent overlay behind the sidebar */
  .sidebar-overlay {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100vw;
    height: calc(100vh - 70px);
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .sidebar-overlay.active {
    opacity: 1;
    pointer-events: auto;
  }
}

  .menu-btn {
    display: flex;
  }

  .search-container {
    width: 50%;
    min-width: 200px;
  }

  .content {
    padding: 1.5rem;
  }
  
  .books-container {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.2rem;
  }

@media (max-width: 576px) {
  header {
    padding: 0.8rem 1rem;
    flex-wrap: wrap;
    gap: 1rem;
  }

  .logo {
    font-size: 1.4rem;
    margin-right: 0.5rem;
    order: 2;
  }
  
  .menu-btn {
    order: 1;
  }

  .search-container {
    width: 100%;
    margin-left: 0;
    order: 3;
    flex-basis: 100%;
  }
  
  .content {
    padding: 1rem;
  }

  .books-container {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 1rem;
  }
  
  .section-title {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
  }

  .book-actions {
    flex-direction: column;
    gap: 0.5rem;
  }

  .download-btn, .read-btn {
    width: 100%;
    padding: 0.6rem;
  }
  
  .book-info {
    padding: 1rem;
  }
}

@media (max-width: 480px) {
  .books-container {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }
  
  .book-cover {
    height: 180px;
  }
  
  .book-title {
    font-size: 1rem;
  }
  
  .content {
    padding: 0.8rem;
  }
}

@media (max-width: 360px) {
  .books-container {
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
  }
  
  .book-cover {
    height: 160px;
  }
  
  .logo {
    font-size: 1.2rem;
  }
}

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

.book-card {
  animation: fadeIn 0.5s ease forwards;
  opacity: 0;
}

.book-card:nth-child(1) { animation-delay: 0.1s; }
.book-card:nth-child(2) { animation-delay: 0.2s; }
.book-card:nth-child(3) { animation-delay: 0.3s; }
.book-card:nth-child(4) { animation-delay: 0.4s; }
.book-card:nth-child(5) { animation-delay: 0.5s; }
.book-card:nth-child(6) { animation-delay: 0.6s; }

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: rgba(0,0,0,0.05);
}

::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.2);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0,0,0,0.3);
}

/* Search Results */
.no-results {
  grid-column: 1 / -1;
}

/* Mobile Overlay for Sidebar */
@media (max-width: 768px) {
  .sidebar.active::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: -1;
  }
}

/* Enhanced Mobile Menu Button Animation */
.menu-btn.active .bar:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}

.menu-btn.active .bar:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

/* Better touch targets for mobile */
@media (max-width: 768px) {
  .categories li a {
    padding: 1rem 1.5rem;
    font-size: 1rem;
  }
  
  .download-btn, .read-btn {
    min-height: 44px; /* iOS recommended touch target */
  }
  
  #search-input {
    font-size: 16px; /* Prevents zoom on iOS */
  }
  
  #search-btn {
    min-width: 44px;
    min-height: 44px;
  }
}

/* Improved book card hover on touch devices */
@media (hover: none) and (pointer: coarse) {
  .book-card:hover {
    transform: none;
  }
  
  .book-card:active {
    transform: scale(0.98);
  }
}

/* Loading states for search */
.books-container.searching {
  opacity: 0.7;
  pointer-events: none;
}

/* Better focus states for accessibility */
.categories li a:focus,
.download-btn:focus,
.read-btn:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Smooth transitions for search results */
.book-card {
  transition: var(--transition), opacity 0.3s ease, transform 0.3s ease;
}

.book-card[style*="display: none"] {
  opacity: 0;
  transform: scale(0.9);
}