/* ===============================================
   CSS Custom Properties (CSS Variables)
   =============================================== */
:root {
  /* Light Theme Colors */
  --primary-color: #2c3e50;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  
  --text-primary: #2c3e50;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  
  --border-color: #dee2e6;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  
  /* Spacing */
  --container-max-width: 1200px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --transition: all 0.3s ease;
  
  /* Typography */
  --font-family: 'Cairo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary-color: #3498db;
  --secondary-color: #2980b9;
  --accent-color: #e74c3c;
  
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  
  --text-primary: #f8f9fa;
  --text-secondary: #adb5bd;
  --text-muted: #6c757d;
  
  --border-color: #404040;
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: var(--transition);
  overflow-x: hidden;
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* ===============================================
   Typography
   =============================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

a {
  color: var(--secondary-color);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-color);
}

/* ===============================================
   Header
   =============================================== */
.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

.logo:hover {
  text-decoration: none;
  color: inherit;
  transform: translateY(-2px);
}

.logo-image {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: var(--border-radius-sm);
}

.logo-text h1 {
  font-size: var(--font-size-2xl);
  color: var(--primary-color);
  margin-bottom: 0;
}

.logo-text p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: 0;
}

.header-controls {
  display: flex;
  gap: 0.5rem;
}

.theme-toggle,
.language-toggle {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.theme-toggle:hover,
.language-toggle:hover {
  background: var(--secondary-color);
  color: white;
  transform: translateY(-2px);
}

/* ===============================================
   Hero Section
   =============================================== */
.hero {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 4rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
  opacity: 0.1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
}

.hero-background-image {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 900px;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 0;
  margin: 0;
  pointer-events: none;
}

.hero-logo {
  margin-bottom: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-logo-image {
  width: 200px;
  height: 200px;
  object-fit: contain;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  padding: 1.5rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-logo-image:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.hero-student-bg {
  width: auto;
  height: 100%;
  max-width: 840px;
  opacity: 0.5;
  object-fit: contain;
  animation: slideInFromLeft 1.2s ease-out;
  margin: 0;
  padding: 0;
}

@keyframes slideInFromLeft {
  0% {
    opacity: 0;
    transform: translateX(-100px);
  }
  100% {
    opacity: 0.5;
    transform: translateX(0);
  }
}

/* For RTL (Arabic) - position on right side */
[dir="rtl"] .hero-background-image {
  left: auto;
  right: 0;
  padding: 0;
  margin: 0;
}

[dir="rtl"] .hero-student-bg {
  animation: slideInFromRight 1.2s ease-out;
}

@keyframes slideInFromRight {
  0% {
    opacity: 0;
    transform: translateX(100px);
  }
  100% {
    opacity: 0.5;
    transform: translateX(0);
  }
}

@keyframes slideInFromLeftMobile {
  0% {
    opacity: 0;
    transform: translateX(-50px);
  }
  100% {
    opacity: 0.5;
    transform: translateX(0);
  }
}

/* Mobile RTL animation */
@media (max-width: 480px) {
  [dir="rtl"] .hero-student-bg {
    animation: slideInFromRightMobile 1s ease-out;
  }
}

@keyframes slideInFromRightMobile {
  0% {
    opacity: 0;
    transform: translateX(50px);
  }
  100% {
    opacity: 0.5;
    transform: translateX(0);
  }
}

.hero h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: 1rem;
  font-weight: 700;
}

.hero p {
  font-size: var(--font-size-lg);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  color: rgba(255, 255, 255, 0.9);
}

.hero-cta {
  margin-bottom: 2rem;
  display: flex;
  justify-content: center;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--accent-color), #c0392b);
  color: white;
  padding: 1rem 2rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-size: var(--font-size-lg);
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(231, 76, 60, 0.3);
  transition: var(--transition);
  border: 2px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.cta-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(231, 76, 60, 0.4);
  text-decoration: none;
  color: white;
  background: linear-gradient(135deg, #c0392b, var(--accent-color));
}

.cta-button i:first-child {
  font-size: 1.2em;
}

.cta-button i:last-child {
  font-size: 0.9em;
  transition: var(--transition);
}

.cta-button:hover i:last-child {
  transform: translateX(3px);
}

/* RTL arrow direction */
[dir="rtl"] .cta-button i:last-child {
  transform: scaleX(-1);
}

[dir="rtl"] .cta-button:hover i:last-child {
  transform: scaleX(-1) translateX(3px);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 2rem;
}

.stat {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: white;
}

.stat-label {
  font-size: var(--font-size-base);
  color: rgba(255, 255, 255, 0.8);
}

/* ===============================================
   Categories Navigation
   =============================================== */
.categories-nav {
  background: var(--bg-secondary);
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.categories-container {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  max-width: 100%;
  align-items: start;
}

#categoriesButtons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.category-btn {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition);
  white-space: normal;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  font-size: var(--font-size-base);
  min-height: 120px;
  text-align: center;
  justify-content: center;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.all-categories-btn {
  background: var(--secondary-color);
  color: white;
  min-width: 120px;
  max-width: 140px;
  min-height: 120px;
  flex-shrink: 0;
}

.all-categories-btn:hover {
  background: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.category-btn:hover,
.category-btn.active {
  background: var(--secondary-color);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* Category image styling */
.category-icon-img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 8px;
  flex-shrink: 0;
}

.category-name {
  font-size: var(--font-size-sm);
  line-height: 1.4;
  text-align: center;
  font-weight: 500;
  word-break: break-word;
  hyphens: auto;
  max-width: 100%;
}

/* Category header styling */
.category-header {
  grid-column: 1 / -1;
  text-align: center;
  margin-bottom: 2rem;
  padding: 2rem;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  animation: fadeInUp 0.6s ease-out;
}

.category-header img {
  max-width: 200px;
  height: auto;
  border-radius: 8px;
  margin-bottom: 1rem;
  box-shadow: 0 4px 12px var(--shadow-color);
  transition: var(--transition);
}

.category-header img:hover {
  transform: scale(1.05);
}

.category-header h3 {
  color: var(--primary-color);
  margin: 0;
  font-size: var(--font-size-2xl);
}

/* ===============================================
   Main Content
   =============================================== */
.main-content {
  padding: 2rem 0;
  min-height: 60vh;
}

.content-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.content-header h3 {
  color: var(--primary-color);
}

.header-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.share-category-btn {
  background: var(--success-color);
  color: white;
  border: none;
  border-radius: var(--border-radius-sm);
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-sm);
}

.share-category-btn:hover {
  background: #219a52;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.view-controls {
  display: flex;
  gap: 0.5rem;
}

.view-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-primary);
  transition: var(--transition);
}

.view-btn:hover,
.view-btn.active {
  background: var(--secondary-color);
  color: white;
}

/* ===============================================
   Search
   =============================================== */
.search-container {
  margin-bottom: 2rem;
}

.search-box {
  position: relative;
  max-width: 400px;
  margin: 0 auto;
}

.search-box i {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  padding: 0.75rem 3rem 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: var(--transition);
}

.search-box input:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.search-clear {
  position: absolute;
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 50%;
  transition: var(--transition);
}

.search-clear:hover {
  background: var(--accent-color);
  color: white;
}

/* ===============================================
   Books Container
   =============================================== */
.books-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.books-container.list-view {
  grid-template-columns: 1fr;
}

.book-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  height: fit-content;
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px var(--shadow-hover);
}

.book-image {
  height: 200px;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--font-size-4xl);
  position: relative;
  overflow: hidden;
}

.book-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.fallback-icon {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: var(--font-size-4xl);
  background: var(--bg-tertiary);
}

.book-content {
  padding: 1.5rem;
}

.book-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.book-category {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: 1rem;
  background: var(--bg-tertiary);
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  display: inline-block;
}

.book-actions {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.book-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 1;
}

.book-link {
  background: var(--secondary-color);
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.book-link:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

.book-link.google-play { background: #01875f; }
.book-link.apk { background: #ff9800; }
.book-link.ios { background: #007aff; }
.book-link.windows { background: #0078d4; }
.book-link.web { background: #9c27b0; }
.book-link.sample { background: #e74c3c; }
.book-link.share { background: var(--success-color); }

.share-btn {
  background: var(--success-color);
  color: white;
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

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

/* ===============================================
   Contact Info RTL Fix
   =============================================== */
.contact-city a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.25rem 0;
  direction: ltr;
  text-align: left;
}

/* RTL language specific adjustments */
[dir="rtl"] .contact-city a {
  direction: ltr;
  text-align: right;
}

[dir="rtl"] .contact-city a {
  justify-content: flex-end;
}

/* ===============================================
   Loading & No Results
   =============================================== */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--secondary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.no-results {
  text-align: center;
  padding: 3rem;
  color: var(--text-secondary);
}

.no-results i {
  font-size: var(--font-size-4xl);
  margin-bottom: 1rem;
  color: var(--text-muted);
}

/* ===============================================
   Toast Notifications
   =============================================== */
@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOutRight {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideOutLeft {
  from {
    transform: translateX(0);
    opacity: 1;
  }
  to {
    transform: translateX(-100%);
    opacity: 0;
  }
}

/* ===============================================
   Footer
   =============================================== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 1rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-section.map-section {
  grid-column: span 2;
}

.footer-map-container {
  width: 100%;
  height: 200px;
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.footer-section p {
  margin-bottom: 0.5rem;
}

.footer-section a {
  display: block;
  padding: 0.25rem 0;
  color: var(--text-secondary);
  transition: var(--transition);
}

.footer-section a:hover {
  color: var(--secondary-color);
  padding-right: 0.5rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.tag {
  background: var(--secondary-color);
  color: white;
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-xs);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-city h5 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 1rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--secondary-color);
}

/* ===============================================
   Modal
   =============================================== */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}

.modal-content {
  background-color: var(--bg-primary);
  margin: 5% auto;
  padding: 0;
  border: none;
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.close {
  position: absolute;
  right: 1rem;
  top: 1rem;
  color: var(--text-muted);
  font-size: var(--font-size-2xl);
  font-weight: bold;
  cursor: pointer;
  z-index: 1001;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--bg-secondary);
  transition: var(--transition);
}

.close:hover {
  background: var(--accent-color);
  color: white;
}

.modal-body {
  padding: 2rem;
}

/* ===============================================
   Responsive Design
   =============================================== */
@media (max-width: 768px) {
  .container {
    padding: 0 0.75rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .logo-image {
    width: 60px;
    height: 60px;
  }
  
  .hero {
    padding: 2rem 0;
  }
  
  .hero-background-image {
    display: none;
  }
  
  .hero h2 {
    font-size: var(--font-size-2xl);
  }
  
  .hero-logo-image {
    width: 150px;
    height: 150px;
    padding: 1rem;
  }
  
  .hero-background-image {
    width: 750px;
    padding: 0;
    margin: 0;
  }
  
  .hero-student-bg {
    height: 90%;
    max-width: 600px;
    margin: 0;
    padding: 0;
  }
  
  .cta-button {
    padding: 0.875rem 1.5rem;
    font-size: var(--font-size-base);
  }
  
  .hero-stats {
    gap: 1.5rem;
  }
  
  .categories-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  #categoriesButtons {
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.75rem;
  }

  .category-btn {
    padding: 0.75rem;
    font-size: var(--font-size-sm);
    min-height: 110px;
  }

  .all-categories-btn {
    min-width: 100px;
    max-width: 120px;
    min-height: 110px;
  }
  
  .category-icon-img {
    width: 36px;
    height: 36px;
  }
  
  .content-header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  
  .books-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .book-actions {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .book-links {
    justify-content: center;
  }
  
  .share-btn {
    align-self: center;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .footer-section.map-section {
    grid-column: span 1;
  }
  
  .footer-map-container {
    height: 250px;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  
  .modal-content {
    width: 95%;
    margin: 10% auto;
  }
  
  .search-box {
    max-width: 100%;
  }
  
  .category-header {
    padding: 1.5rem;
  }
  
  .category-header img {
    max-width: 150px;
  }
}

@media (max-width: 480px) {
  .hero-logo-image {
    width: 120px;
    height: 120px;
    padding: 0.75rem;
  }
  
  .hero-background-image {
    width: 600px;
    padding: 0;
    margin: 0;
  }
  
  .hero-student-bg {
    height: 80%;
    max-width: 480px;
    animation: slideInFromLeftMobile 1s ease-out;
    margin: 0;
    padding: 0;
  }
  
  .cta-button {
    padding: 0.75rem 1.25rem;
    font-size: var(--font-size-sm);
    gap: 0.5rem;
  }
  
  .hero-stats {
    flex-direction: column;
    gap: 1rem;
  }
  
  .book-content {
    padding: 1rem;
  }
  
  .book-links {
    flex-direction: column;
  }
  
  .book-link {
    justify-content: center;
  }
  
  .category-header {
    padding: 1rem;
  }
  
  .category-header img {
    max-width: 120px;
  }
  
  .category-header h3 {
    font-size: var(--font-size-xl);
  }
  
  .categories-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  #categoriesButtons {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.5rem;
  }
  
  .category-btn {
    padding: 0.5rem;
    min-height: 100px;
  }
  
  .all-categories-btn {
    min-width: 80px;
    max-width: 100px;
    min-height: 80px;
  }
  
  .category-icon-img {
    width: 32px;
    height: 32px;
  }
  
  .category-name {
    font-size: var(--font-size-xs);
  }
}

/* ===============================================
   Animations
   =============================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.book-card {
  animation: fadeInUp 0.6s ease-out;
  animation-fill-mode: both;
}

.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; }

/* ===============================================
   Utility Classes
   =============================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }

.hidden { display: none; }
.visible { display: block; }

/* ===============================================
   Page Content Styles
   =============================================== */
.page-content {
    max-width: 900px;
    margin: 0 auto;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.page-header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

.content-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.content-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--secondary-color);
}

.content-section h3 {
    color: var(--text-primary);
    margin: 1.5rem 0 1rem 0;
}

.content-section ul {
    list-style: none;
    padding: 0;
}

.content-section ul li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    padding-right: 1.5rem;
}

.content-section ul li:before {
    content: "•";
    color: var(--secondary-color);
    font-weight: bold;
    position: absolute;
    right: 0;
}

.content-section ul li:last-child {
    border-bottom: none;
}

.page-footer {
    text-align: center;
    margin-top: 3rem;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: var(--secondary-color);
    color: white;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
}

.back-btn:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

/* Support Page Specific Styles */
.support-hero {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.support-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
}

.support-card.primary {
    background: linear-gradient(135deg, #25D366, #128C7E);
    color: white;
    border: none;
}

.support-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px var(--shadow-hover);
}

.support-card .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.support-card.primary .icon {
    color: white;
}

.support-card .icon {
    color: var(--secondary-color);
}

.whatsapp-btn, .phone-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    margin-top: 1rem;
    transition: var(--transition);
}

.phone-btn {
    background: var(--secondary-color);
}

.whatsapp-btn:hover, .phone-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.service-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.service-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.service-item i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.service-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.faq-list {
    space-y: 1rem;
}

.faq-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.faq-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.location-section {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    align-items: start;
}

.map-container {
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.location-info {
    background: var(--bg-primary);
    padding: 1.5rem;
    border-radius: var(--border-radius-sm);
    border: 1px solid var(--border-color);
}

.location-info h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.hours-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.hours-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 1.5rem;
    text-align: center;
}

.hours-item h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 1.5rem;
    transition: var(--transition);
}

.contact-method:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.contact-method.whatsapp .method-icon {
    color: #25D366;
}

.contact-method.phone .method-icon {
    color: var(--secondary-color);
}

.contact-method.email .method-icon {
    color: var(--accent-color);
}

.method-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.method-info h4 {
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.method-info p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.method-info a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
}

.method-info a:hover {
    text-decoration: underline;
}

/* Responsive Design for Pages */
@media (max-width: 768px) {
    .location-section {
        grid-template-columns: 1fr;
    }
    
    .support-hero {
        grid-template-columns: 1fr;
    }
    
    .services-grid,
    .hours-grid,
    .contact-methods {
        grid-template-columns: 1fr;
    }
    
    .content-section {
        padding: 1.5rem;
        margin-bottom: 2rem;
    }
}

/* ===============================================
   Print Styles
   =============================================== */
@media print {
  .header,
  .categories-nav,
  .footer,
  .modal {
    display: none;
  }
  
  .main-content {
    padding: 0;
  }
  
  .book-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #000;
  }
}