:root {
  --primary-color: #4a6cf7;
  --primary-dark: #3a56c5;
  --secondary-color: #6c757d;
  --background-color: #ffffff;
  --text-color: #333333;
  --light-gray: #f8f9fa;
  --border-color: #e9ecef;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --info-color: #17a2b8;
}

/* Dark theme colors */
.dark-theme {
  --primary-color: #5d7bf9;
  --primary-dark: #4a6cf7;
  --secondary-color: #a0a0a0;
  --background-color: #121212;
  --text-color: #f0f0f0;
  --light-gray: #1e1e1e;
  --border-color: #2d2d2d;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  transition: background-color 0.3s, color 0.3s;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: 1rem;
  line-height: 1.3;
}

.page-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.page-description {
  font-size: 1.2rem;
  color: var(--secondary-color);
  margin-bottom: 2rem;
}

.section-title {
  font-size: 2rem;
  margin-bottom: 2rem;
  text-align: center;
}

/* Header */
.site-header {
  background-color: var(--background-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color 0.3s;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 20px;
}

.header-left, .header-right {
  display: flex;
  align-items: center;
}

.site-title {
  font-size: 1.5rem;
  margin: 0;
}

.site-title a {
  color: var(--text-color);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  color: var(--text-color);
  font-weight: 500;
}

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

.header-right {
  display: flex;
  gap: 1rem;
}

.search-toggle,
.theme-toggle,
.menu-toggle {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.5rem;
  transition: color 0.3s;
}

.search-toggle:hover,
.theme-toggle:hover,
.menu-toggle:hover {
  color: var(--primary-color);
}

.search-container {
  display: none;
  padding: 1rem 0;
  background-color: var(--background-color);
  border-top: 1px solid var(--border-color);
  transition: background-color 0.3s;
}

.search-container.active {
  display: block;
}

.search-form {
  display: flex;
  max-width: 600px;
  margin: 0 auto;
}

.search-form input {
  flex-grow: 1;
  padding: 0.8rem;
  border: 1px solid var(--border-color);
  border-right: none;
  border-radius: 4px 0 0 4px;
  font-size: 1rem;
  background-color: var(--background-color);
  color: var(--text-color);
  transition: border-color 0.3s, background-color 0.3s, color 0.3s;
}

.search-form input:focus {
  outline: none;
  border-color: var(--primary-color);
}

.search-form button {
  padding: 0 1rem;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 0 4px 4px 0;
  cursor: pointer;
  transition: background-color 0.3s;
}

.search-form button:hover {
  background-color: var(--primary-dark);
}

/* Hero section */
.hero {
  padding: 4rem 0;
  background-color: var(--light-gray);
  text-align: center;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: var(--secondary-color);
}

.hero-search {
  max-width: 700px;
  margin: 0 auto;
}

.search-form-large {
  display: flex;
  background-color: var(--background-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.search-form-large input {
  flex-grow: 1;
  padding: 1rem;
  border: none;
  font-size: 1.1rem;
  background-color: var(--background-color);
  color: var(--text-color);
}

.search-form-large input:focus {
  outline: none;
}

.search-form-large button {
  padding: 1rem 2rem;
  background-color: var(--primary-color);
  color: white;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  transition: background-color 0.3s;
}

.search-form-large button:hover {
  background-color: var(--primary-dark);
}

/* Breadcrumbs */
.breadcrumbs {
  margin-bottom: 2rem;
  color: var(--secondary-color);
}

.breadcrumbs a {
  color: var(--secondary-color);
}

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

/* college cards */
.college-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.college-card {
  display: flex;
  flex-direction: column;
  background-color: var(--background-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  /* transition: transform 0.3s, box-shadow 0.3s; */
}

/* .college-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
} */

.college-icon {
  padding: 2rem;
  font-size: 3rem;
  text-align: center;
  background-color: var(--primary-color);
  color: white;
}

.college-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.college-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.college-description {
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.btn-view {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: var(--primary-color);
  color: white;
  border-radius: 4px;
  font-weight: 500;
  text-align: center;
  transition: background-color 0.3s;
}

.btn-view:hover {
  background-color: var(--primary-dark);
  color: white;
}

/* Semester cards */
.semester-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.semester-card {
  display: flex;
  flex-direction: column;
  background-color: var(--background-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.semester-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.semester-icon {
  padding: 2rem;
  font-size: 3rem;
  text-align: center;
  background-color: var(--info-color);
  color: white;
}

.semester-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.semester-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.semester-description {
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* Subject cards */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.subject-card {
  background-color: var(--background-color);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
}

.subject-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.subject-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.subject-description {
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.subject-meta {
  margin-bottom: 1.5rem;
  color: var(--secondary-color);
  font-size: 0.9rem;
}

.subject-college {
  margin-right: 1rem;
}

/* PDF cards */
.pdf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
}

.pdf-card {
  display: flex;
  background-color: var(--background-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.pdf-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.pdf-icon {
  padding: 2rem;
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-color);
  color: white;
  min-width: 80px;
}

.pdf-content {
  padding: 1.5rem;
  flex-grow: 1;
}

.pdf-title {
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.pdf-meta {
  margin-bottom: 1.5rem;
  color: var(--secondary-color);
  font-size: 0.9rem;
}

.pdf-pages {
  margin-right: 1rem;
}

.pdf-actions {
  display: flex;
  gap: 1rem;
}

.btn-download {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  border-radius: 4px;
  font-weight: 500;
  text-align: center;
  transition: background-color 0.3s, color 0.3s;
}

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

/* PDF List */
.pdf-list {
  margin-bottom: 3rem;
}

.pdf-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  background-color: var(--background-color);
  border-radius: 8px;
  margin-bottom: 1rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.pdf-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.pdf-info {
  flex-grow: 1;
}

.pdf-info h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.pdf-info .pdf-meta {
  margin-bottom: 0;
}

.pdf-actions {
  display: flex;
  gap: 1rem;
  flex-shrink: 0;
}

/* PDF Viewer */
.pdf-viewer-header {
  margin-bottom: 2rem;
}

.pdf-title {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.pdf-meta {
  margin-bottom: 1.5rem;
  color: var(--secondary-color);
}

.pdf-meta span {
  margin-right: 1.5rem;
}

.pdf-actions-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

.btn-fullscreen,
.btn-print {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: transparent;
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

.btn-fullscreen:hover,
.btn-print:hover {
  background-color: var(--light-gray);
  border-color: var(--secondary-color);
}

.pdf-viewer-container {
  margin-bottom: 2rem;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  background-color: var(--background-color);
  transition: background-color 0.3s;
}

.pdf-iframe {
  display: block;
  width: 100%;
  height: 800px;
  border: none;
}

.pdf-navigation {
  display: flex;
  justify-content: space-between;
  margin-bottom: 3rem;
}

.nav-prev,
.nav-next {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.5rem;
  background-color: var(--light-gray);
  color: var(--text-color);
  border-radius: 4px;
  transition: background-color 0.3s, color 0.3s;
}

.nav-prev:hover,
.nav-next:hover {
  background-color: var(--primary-color);
  color: white;
}

/* Filter buttons */
.subject-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background-color: var(--light-gray);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s;
}

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

/* Section footer */
.section-footer {
  text-align: center;
  margin-top: 2rem;
}

.btn-primary {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: var(--primary-color);
  color: white;
  border-radius: 4px;
  font-weight: 500;
  text-align: center;
  transition: background-color 0.3s;
}

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

.btn-secondary {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  border-radius: 4px;
  font-weight: 500;
  text-align: center;
  transition: background-color 0.3s, color 0.3s;
}

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

/* About page */
.about-container {
  max-width: 800px;
  margin: 0 auto;
}

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

.about-tagline {
  font-size: 1.5rem;
  color: var(--secondary-color);
}

.about-content h2 {
  font-size: 1.8rem;
  margin: 2rem 0 1rem;
}

.about-content p {
  margin-bottom: 1.5rem;
}

.about-content ul,
.about-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.about-content li {
  margin-bottom: 0.5rem;
}

.about-cta {
  display: flex;
  gap: 1rem;
  margin-top: 3rem;
  justify-content: center;
}

/* Search results */
/* .search-results-container {
  max-width: 800px;
  margin: 0 auto;
} */

/* .search-header {
  margin-bottom: 2rem;
} */

/* .search-info {
  margin-bottom: 1.5rem;
  color: var(--secondary-color);
} */

/* .search-results {
  margin-top: 2rem;
} */

/* .search-result {
  padding: 1.5rem;
  margin-bottom: 1rem;
  background-color: var(--background-color);
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
} */

/* .search-result:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.search-result h3 {
  margin-bottom: 0.5rem;
}

.search-result p {
  color: var(--secondary-color);
} */

.loading {
  text-align: center;
  padding: 2rem;
  color: var(--secondary-color);
}

.loading i {
  margin-right: 0.5rem;
}

/* Footer */
.site-footer {
  background-color: var(--light-gray);
  padding: 3rem 0;
  margin-top: 3rem;
  transition: background-color 0.3s;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.footer-left {
  flex-basis: 300px;
  flex-grow: 1;
  margin-right: 2rem;
}

.footer-left h2 {
  margin-bottom: 1rem;
}

.footer-left p {
  color: var(--secondary-color);
}

.footer-right {
  flex-grow: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-links {
  min-width: 200px;
}

.footer-links h3 {
  margin-bottom: 1.2rem;
  font-size: 1.2rem;
}

.footer-links ul {
  list-style-type: none;
}

.footer-links li {
  margin-bottom: 0.8rem;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--secondary-color);
}

/* Responsive design */
@media (max-width: 992px) {
  .college-grid,
  .subject-grid,
  .pdf-grid,
  .semester-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .site-header .container {
    flex-wrap: wrap;
  }
  
  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    padding-top: 1rem;
    margin-top: 1rem;
    border-top: 1px solid var(--border-color);
  }
  
  .site-nav.active {
    display: flex;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    font-size: 1.2rem;
  }
  
  .college-grid,
  .subject-grid,
  .pdf-grid,
  .semester-grid {
    grid-template-columns: 1fr;
  }
  
  .pdf-item {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .pdf-info {
    margin-bottom: 1rem;
  }
  
  .search-form-large {
    flex-direction: column;
  }
  
  .search-form-large input {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }
  
  .footer-content {
    flex-direction: column;
  }
  
  .footer-left {
    margin-right: 0;
    margin-bottom: 2rem;
  }
}

/* Branch cards */
.branch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.branch-card {
  display: flex;
  flex-direction: column;
  background-color: var(--background-color);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s, box-shadow 0.3s;
}

.branch-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.branch-icon {
  padding: 2rem;
  font-size: 3rem;
  text-align: center;
  background-color: var(--success-color);
  color: white;
}

.branch-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.branch-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.branch-description {
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.branch-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  color: var(--secondary-color);
  font-size: 0.9rem;
}

.branch-meta i {
  margin-right: 0.5rem;
}

/* Update responsive design to include branch-grid */
@media (max-width: 992px) {
  .college-grid,
  .subject-grid,
  .pdf-grid,
  .semester-grid,
  .branch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .college-grid,
  .subject-grid,
  .pdf-grid,
  .semester-grid,
  .branch-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== ENHANCED SEARCH STYLES ===== */

.search-page {
  background: white;
}

.search-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 4rem 0 3rem;
  text-align: center;
}

.header-content h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: white;
}

.header-subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
  color: white;
}

.search-form-section {
  background: white;
  padding: 3rem 0;
  border-bottom: 1px solid #f1f3f4;
}

.search-form-container {
  max-width: 800px;
  margin: 0 auto;
}

.advanced-search-form {
  background: #f8f9fa;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.search-input-container {
  display: flex;
  border: 2px solid #e9ecef;
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.3s ease;
}

.search-input-container:focus-within {
  border-color: #3498db;
}

.search-input-main {
  flex: 1;
  padding: 1rem;
  border: none;
  outline: none;
  font-size: 1.1rem;
}

.search-submit-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  background: #3498db;
  color: white;
  border: none;
  cursor: pointer;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

.search-submit-btn:hover {
  background: #2980b9;
}

.search-filters {
  border-top: 1px solid #e9ecef;
  padding-top: 2rem;
}

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

.filters-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: 1px solid #e9ecef;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filters-toggle:hover {
  background: #f8f9fa;
  border-color: #3498db;
}

.filters-content {
  display: none;
}

.filter-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.filter-group select {
  padding: 0.75rem;
  border: 1px solid #e9ecef;
  border-radius: 6px;
  background: white;
}

.search-results-section {
  padding: 3rem 0;
}

.search-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #f1f3f4;
}

.view-controls {
  display: flex;
  border: 1px solid #e9ecef;
  border-radius: 6px;
  overflow: hidden;
}

.view-btn {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.5rem 0.75rem;
  background: white;
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.8rem;
}

.view-btn:hover {
  background: #f8f9fa;
}

.view-btn.active {
  background: #3498db;
  color: white;
}

.active-search-filters {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1rem;
  background: #f8f9fa;
  border-radius: 8px;
  flex-wrap: wrap;
}

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

.filter-tag {
  background: #e3f2fd;
  color: #1976d2;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-tag button {
  background: none;
  border: none;
  color: #1976d2;
  cursor: pointer;
  font-weight: bold;
  padding: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-welcome {
  text-align: center;
  padding: 4rem 2rem;
}

.welcome-icon {
  font-size: 4rem;
  margin-bottom: 2rem;
}

.quick-search-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.quick-search-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: left;
}

.quick-search-btn:hover {
  border-color: #3498db;
  background: rgba(52, 152, 219, 0.05);
}

.search-loading {
  text-align: center;
  padding: 4rem 2rem;
  color: #6c757d;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #3498db;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

.results-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.search-result-item {
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.3s ease;
}

.search-result-item:hover {
  border-color: #3498db;
  box-shadow: 0 4px 20px rgba(52, 152, 219, 0.1);
}

.result-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

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

.result-meta {
  flex: 1;
}

.result-title {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
}

.result-title a {
  color: #2c3e50;
  text-decoration: none;
  transition: color 0.3s ease;
}

.result-title a:hover {
  color: #3498db;
}

.result-info {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
  color: #6c757d;
  flex-wrap: wrap;
}

.result-info span {
  background: #f8f9fa;
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  font-size: 0.8rem;
}

.result-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ===== ENHANCED CARD ANIMATIONS ===== */

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.animate-on-scroll.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.college-card,
.branch-card,
.semester-card,
.subject-card,
.pdf-card {
  transition: all 0.3s ease;
  transform-style: preserve-3d;
}

.college-card:hover,
.branch-card:hover,
.semester-card:hover,
.subject-card:hover,
.pdf-card:hover {
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

/* Ripple effect for buttons */
.btn {
  position: relative;
  overflow: hidden;
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.6);
  transform: scale(0);
  animation: ripple-animation 0.6s linear;
  pointer-events: none;
}

@keyframes ripple-animation {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

/* ===== RESPONSIVE DESIGN ===== */

@media (max-width: 768px) {
  .search-header {
    padding: 3rem 0 2rem;
  }
  
  .header-content h1 {
    font-size: 2.5rem;
  }
  
  .advanced-search-form {
    padding: 1.5rem;
  }
  
  .filter-row {
    grid-template-columns: 1fr;
  }
  
  .search-status {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .result-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .result-actions {
    width: 100%;
    justify-content: flex-start;
  }
  
  .quick-search-buttons {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header-content h1 {
    font-size: 2rem;
  }
  
  .search-submit-btn {
    padding: 1rem;
  }
  
  .search-submit-btn .search-text {
    display: none;
  }
  
  .result-info {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .result-actions {
    flex-direction: column;
  }
}

/* ===== PDF VIEWER STYLES ===== */

.pdf-viewer-header {
  background: var(--card-bg, #f8f9fa);
  padding: 2rem;
  border-radius: 12px;
  margin-bottom: 2rem;
  border: 1px solid var(--border-color, #e9ecef);
}

.pdf-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--heading-color, #2c3e50);
  margin-bottom: 1rem;
}

.pdf-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  color: var(--muted-color, #6c757d);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.meta-item i {
  color: var(--primary-color, #5d7bf9);
}

/* Viewer Options */
.viewer-options {
  background: var(--card-bg, white);
  border: 1px solid var(--border-color, #e9ecef);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.viewer-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.viewer-tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--tab-bg, #f8f9fa);
  border: 1px solid var(--border-color, #e9ecef);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
  color: var(--text-color, #495057);
}

.viewer-tab:hover {
  background: var(--tab-hover, #e9ecef);
  border-color: var(--primary-color, #5d7bf9);
}

.viewer-tab.active {
  background: var(--primary-color, #5d7bf9);
  color: white;
  border-color: var(--primary-color, #5d7bf9);
}

.viewer-info {
  padding: 1rem;
  background: var(--info-bg, #f8f9fa);
  border-radius: 6px;
  border-left: 4px solid var(--primary-color, #5d7bf9);
}

.viewer-description {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted-color, #6c757d);
}

/* PDF Actions Bar */
.pdf-actions-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card-bg, white);
  border: 1px solid var(--border-color, #e9ecef);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  margin-bottom: 2rem;
}

.action-group {
  display: flex;
  gap: 1rem;
}

.btn-action {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--button-bg, #f8f9fa);
  border: 1px solid var(--border-color, #e9ecef);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  color: var(--text-color, #495057);
  font-size: 0.9rem;
}

.btn-action:hover {
  background: var(--button-hover, #e9ecef);
  border-color: var(--primary-color, #5d7bf9);
  color: var(--primary-color, #5d7bf9);
}

/* .btn-download {
  background: var(--success-color, #28a745);
  color: white;
  border-color: var(--success-color, #28a745);
} */

.btn-download:hover {
  background: var(--success-hover, #218838);
  color: white;
}

.btn-external {
  background: var(--info-color, #5d7bf9);
  color: white;
  border-color: var(--info-color, #5d7bf9);
}

.btn-external:hover {
  background: var(--info-hover, #5d7bf9);
  color: white;
}

/* PDF Viewer Container */
.pdf-viewer-container {
  position: relative;
  background: var(--card-bg, white);
  border: 1px solid var(--border-color, #e9ecef);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.viewer-content {
  display: none;
  width: 100%;
  height: 80vh;
  min-height: 600px;
}

.viewer-content.active {
  display: block;
}

/* Iframe Viewer */
.iframe-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.pdf-iframe {
  width: 100%;
  height: 100%;
  border: none;
  background: var(--viewer-bg, #f8f9fa);
}

.iframe-fallback {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--card-bg, white);
  display: none;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.fallback-content {
  text-align: center;
  padding: 2rem;
  max-width: 400px;
}

.fallback-content i {
  font-size: 3rem;
  color: var(--warning-color, #ffc107);
  margin-bottom: 1rem;
}

.fallback-content h3 {
  color: var(--heading-color, #2c3e50);
  margin-bottom: 1rem;
}

.fallback-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

/* PDF.js Viewer */
.pdfjs-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  background: var(--viewer-bg, #f8f9fa);
}

.pdfjs-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--toolbar-bg, #343a40);
  color: white;
  border-bottom: 1px solid var(--border-color, #495057);
}

.toolbar-left,
.toolbar-center,
.toolbar-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toolbar-btn {
  padding: 0.5rem;
  background: transparent;
  border: 1px solid var(--border-color, #495057);
  border-radius: 4px;
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
}

.toolbar-btn:hover {
  background: var(--button-hover, #495057);
  border-color: var(--primary-color, #5d7bf9);
}

.toolbar-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.page-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.page-info input {
  width: 60px;
  padding: 0.25rem;
  border: 1px solid var(--border-color, #495057);
  border-radius: 4px;
  text-align: center;
  background: var(--input-bg, #2c3e50);
  color: white;
}

.page-info input:focus {
  outline: none;
  border-color: var(--primary-color, #5d7bf9);
}

#zoom-select {
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border-color, #495057);
  border-radius: 4px;
  background: var(--input-bg, #2c3e50);
  color: white;
  cursor: pointer;
}

#zoom-select:focus {
  outline: none;
  border-color: var(--primary-color, #5d7bf9);
}

.pdfjs-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 1rem;
  position: relative;
}

#pdf-canvas {
  max-width: 100%;
  max-height: 100%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.pdfjs-loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--muted-color, #6c757d);
}

/* Loading and Error States */
.pdf-loading,
.pdf-error {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--card-bg, white);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-content,
.error-content {
  text-align: center;
  padding: 2rem;
  max-width: 400px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color, #f3f3f3);
  border-top: 4px solid var(--primary-color, #5d7bf9);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

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

.error-content i {
  font-size: 3rem;
  color: var(--danger-color, #dc3545);
  margin-bottom: 1rem;
}

.error-content h3 {
  color: var(--heading-color, #2c3e50);
  margin-bottom: 1rem;
}

.error-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

/* PDF Navigation */
.pdf-navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  margin-top: 2rem;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--card-bg, white);
  border: 1px solid var(--border-color, #e9ecef);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-color, #495057);
  font-weight: 500;
  transition: all 0.3s ease;
  min-width: 120px;
}

.nav-btn:hover {
  background: var(--primary-color, #5d7bf9);
  color: white;
  border-color: var(--primary-color, #5d7bf9);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.nav-prev {
  text-align: left;
}

.nav-next {
  text-align: right;
}

.nav-btn small {
  font-size: 0.8rem;
  opacity: 0.8;
}

/* Dark Theme Support */
.dark-theme {
  --card-bg: #2d2d2d;
  --heading-color: #ffffff;
  --text-color: #ffffff;
  --muted-color: #cccccc;
  --border-color: #2d2d2d;
  --button-bg: #404040;
  --button-hover: #505050;
  --tab-bg: #404040;
  --tab-hover: #505050;
  --info-bg: #3d4a5c;
  --viewer-bg: #1a1a1a;
  --toolbar-bg: #1a1a1a;
  --input-bg: #1a1a1a;
  --primary-color: #5d7bf9;
  --primary-hover: #339af0;
  --success-color: #51cf66;
  --success-hover: #40c057;
  --info-color: #22b8cf;
  --info-hover: #15aabf;
  --warning-color: #ffd43b;
  --danger-color: #ff6b6b;
}

/* Responsive Design */
@media (max-width: 768px) {
  .pdf-viewer-header {
    padding: 1.5rem;
  }
  
  .pdf-title {
    font-size: 1.5rem;
  }
  
  .pdf-meta {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .viewer-tabs {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .viewer-tab {
    justify-content: center;
  }
  
  .pdf-actions-bar {
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
  }
  
  .action-group {
    justify-content: center;
  }
  
  .viewer-content {
    height: 60vh;
    min-height: 400px;
  }
  
  .pdfjs-toolbar {
    flex-direction: column;
    gap: 1rem;
    padding: 0.5rem;
  }
  
  .toolbar-left,
  .toolbar-center,
  .toolbar-right {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .pdf-navigation {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-btn {
    min-width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .pdf-viewer-header {
    padding: 1rem;
  }
  
  .pdf-title {
    font-size: 1.25rem;
  }
  
  .btn-action span {
    display: none;
  }
  
  .viewer-content {
    height: 50vh;
    min-height: 300px;
  }
  
  .fallback-actions {
    flex-direction: column;
  }
  
  .error-actions {
    flex-direction: column;
  }
}





/* Mobile hints for PDF viewer */
.mobile-hint {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--warning-bg, #fff3cd);
  border: 1px solid var(--warning-border, #ffeaa7);
  border-radius: 6px;
  display: none;
}

.mobile-hint-content {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--warning-color, #856404);
  font-size: 0.9rem;
}

.mobile-hint-content i {
  color: var(--warning-accent, #f39c12);
  font-size: 1.2rem;
}

.mobile-hint-content strong {
  color: var(--primary-color, #3498db);
}

.mobile-fallback-message {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--info-bg, #d1ecf1);
  border-radius: 6px;
  color: var(--info-color, #0c5460);
  font-size: 0.9rem;
}

.mobile-fallback-message p {
  margin: 0.5rem 0;
}

/* Show mobile hints only on mobile devices */
@media (max-width: 768px) {
  .mobile-hint {
    display: block;
  }
}

/* Dark theme support */
.dark-theme .mobile-hint {
  background: var(--warning-bg, #3d3d00);
  border-color: var(--warning-border, #666600);
}

.dark-theme .mobile-hint-content {
  color: var(--warning-color, #ffeb3b);
}

.dark-theme .mobile-fallback-message {
  background: var(--info-bg, #1e3a8a);
  color: var(--info-color, #bfdbfe);
}