/* ===================================
   CSS Variables and Global Styles
   =================================== */

:root {
  /* Primary Colors */
  --color-primary: #2563eb;
  --color-primary-dark: #1e40af;
  --color-primary-light: #3b82f6;
  
  /* Secondary Colors */
  --color-secondary: #64748b;
  --color-secondary-dark: #475569;
  --color-secondary-light: #94a3b8;
  
  /* Status Colors */
  --color-success: #10b981;
  --color-error: #ef4444;
  --color-warning: #f59e0b;
  --color-info: #06b6d4;
  
  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-bg-overlay: rgba(0, 0, 0, 0.5);
  
  /* Text Colors */
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-tertiary: #94a3b8;
  --color-text-inverse: #ffffff;
  
  /* Border Colors */
  --color-border: #e2e8f0;
  --color-border-dark: #cbd5e1;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Typography */
  /* Use Poppins as primary (index.html already loads Google Fonts). Fall back to system fonts. */
  --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --line-height-base: 1.6;
  --line-height-tight: 1.25;

  /* Surface and subtle tokens for a professional look */
  --surface: #ffffff;
  --muted: #6b7280;
  --glass-overlay: rgba(255,255,255,0.06);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;

  /* Dark Mode Colors */
  --color-dark-bg: #181a20;
  --color-dark-card: #23263a;
  --color-dark-text: #e0e7ff;
  --color-dark-accent: #2563eb;
  --color-dark-border: #2d3142;
  --color-dark-modal: #23263a;
  --color-highlight: #fff59d;
}

/* Global Reset */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Base Styles */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  min-height: 100vh;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
  margin-bottom: var(--spacing-md);
}

/* ===================================
   Header and Search Interface
   =================================== */

.header {
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-xl) 0;
  margin-bottom: var(--spacing-xl);
}

.app-title {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.app-subtitle {
  color: var(--color-text-secondary);
  font-size: 1rem;
  margin-bottom: 0;
}

.main-content {
  padding-bottom: var(--spacing-2xl);
}

.section-title {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-primary);
}

/* Search Section */
.search-section {
  background-color: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.search-bar {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.search-input {
  flex: 1;
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-family);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-input::placeholder {
  color: var(--color-text-tertiary);
}

.search-options {
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

/* Form Elements */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.form-select,
.form-input {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-family: var(--font-family);
  background-color: var(--color-bg-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px;
}

.form-select:focus,
.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Buttons */
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
  min-width: 44px;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  background-color: var(--color-secondary-light);
  cursor: not-allowed;
  transform: none;
}

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

.btn-secondary:hover {
  background-color: var(--color-secondary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary:active {
  transform: translateY(0);
}

/* ===================================
   Genre Buttons and Filter Panel
   =================================== */

.genre-section {
  background-color: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.genre-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.genre-btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
}

.genre-btn:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.genre-btn:active {
  transform: translateY(0);
}

/* Filter Section */
.filter-section {
  background-color: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.filter-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
}

.filter-actions {
  grid-column: 1 / -1;
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

/* ===================================
   Results Grid and Book Cards
   =================================== */

.results-section {
  margin-bottom: var(--spacing-xl);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.book-card {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

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

.book-cover {
  width: 100%;
  height: 280px;
  object-fit: cover;
  background-color: var(--color-bg-tertiary);
}

.book-info {
  padding: var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.book-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.4;
}

.book-author {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.book-meta {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-md);
}

.book-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  padding-top: 0;
}

.btn-detail {
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
}

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

.select-list {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-family: var(--font-family);
  background-color: var(--color-bg-primary);
  cursor: pointer;
  min-height: 44px;
}

.compare-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm);
  min-height: 44px;
}

.compare-input {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

/* ===================================
   Modals and Overlays
   =================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(16, 24, 40, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.modal.hidden {
  display: none;
}

.modal-content {
  position: relative;
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  max-width: 720px;
  width: 95vw;
  margin: 60px auto;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  max-height: 85vh;
  overflow-y: auto;
}
/* Modal section and bullet styling */
.modal-section {
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}
.modal-section:last-child {
  border-bottom: none;
}
.modal-section-title {
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  font-size: 1rem;
}
.card.pretty { display: flex; flex-direction: column; height: auto; }
.modal-section-list {
  margin: 0 0 0 18px;
  padding: 0;
  list-style: disc;
  color: var(--color-text-primary);
  font-size: 0.98em;
  line-height: 1.5;
  color: inherit; /* Match the text color of the parent container */
  font-family: var(--font-family); /* Match the font type of the contact section */
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: 1px solid var(--color-border);
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: background 0.18s, color 0.18s, transform 0.12s;
}
.modal-close:hover {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  transform: translateY(-1px);
}
/* duplicate modal-close styles removed */

/* Book Detail Modal */
.book-detail {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.book-detail-sidebar {
  display: flex;
  flex-direction: column;
}

.detail-cover {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.book-detail-main {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.detail-title {
  font-size: 1.75rem;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.detail-author {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.detail-meta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.detail-meta p {
  margin-bottom: 0;
  font-size: 0.875rem;
}

.detail-description h3,
.detail-subjects h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.detail-description p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.subject-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.subject-tag {
  padding: var(--spacing-xs) var(--spacing-md);
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
}

.detail-actions {
  margin-top: var(--spacing-md);
}

#detailAddToList {
  width: 100%;
  max-width: 300px;
}

/* Comparison Modal */
.comparison-table-wrapper {
  overflow-x: auto;
  margin-top: var(--spacing-lg);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.comparison-table thead {
  position: sticky;
  top: 0;
  background-color: var(--color-bg-primary);
  z-index: 10;
}

.comparison-table th,
.comparison-table td {
  padding: var(--spacing-md);
  text-align: left;
  border: 1px solid var(--color-border);
}

.comparison-table th {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: 600;
}

.comparison-table tbody tr:nth-child(even) {
  background-color: var(--color-bg-secondary);
}

.comparison-table tbody tr:hover {
  background-color: var(--color-bg-tertiary);
}

.comparison-table img {
  max-width: 100px;
  border-radius: var(--radius-md);
}

/* ===================================
   Statistics, Loading, and Error States
   =================================== */

.statistics-section {
  background-color: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stat-card h3 {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  opacity: 0.9;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0;
}

.search-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
}

.search-stats p {
  margin-bottom: 0;
  font-size: 0.875rem;
}

/* Controls Section */
.controls-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  background-color: var(--color-bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.export-controls,
.comparison-controls {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.export-controls h3 {
  font-size: 1rem;
  margin-bottom: var(--spacing-sm);
}

.export-controls {
  flex-direction: row;
  align-items: center;
}

/* Loading Spinner */
.loading-spinner {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg-overlay);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2000;
}

.spinner {
  width: 60px;
  height: 60px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-spinner p {
  margin-top: var(--spacing-lg);
  color: var(--color-text-inverse);
  font-size: 1.125rem;
  font-weight: 500;
}

.results-grid.loading {
  opacity: 0.5;
  pointer-events: none;
}

/* Error Message */
.error-message {
  position: fixed;
  top: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  max-width: 600px;
  width: 90%;
  padding: var(--spacing-lg);
  background-color: #fee;
  color: var(--color-error);
  border: 2px solid var(--color-error);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 3000;
  font-weight: 500;
  text-align: center;
}

.error-message.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  padding: var(--spacing-lg);
}

.pagination button {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 44px;
  min-width: 44px;
}

.pagination button:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.pagination button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination .page-info {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  padding: 0 var(--spacing-md);
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablet (768px and below) */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .header {
    padding: var(--spacing-lg) 0;
  }
  
  .app-title {
    font-size: 1.5rem;
  }
  
  .app-subtitle {
    font-size: 0.875rem;
  }
  
  /* Stack search options vertically */
  .search-options {
    flex-direction: column;
  }
  
  .search-bar {
    flex-direction: column;
  }
  
  /* Stack filter panel vertically */
  .filter-panel {
    grid-template-columns: 1fr;
  }
  
  .filter-actions {
    flex-direction: column;
  }
  
  /* Reduce grid columns */
  .results-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  /* Book detail modal */
  .book-detail {
    grid-template-columns: 1fr;
  }
  
  .book-detail-sidebar {
    max-width: 250px;
    margin: 0 auto;
  }
  
  /* Comparison table scrollable */
  .comparison-table-wrapper {
    overflow-x: scroll;
    -webkit-overflow-scrolling: touch;
  }
  
  .comparison-table {
    min-width: 600px;
  }
  
  /* Controls section */
  .controls-section {
    flex-direction: column;
    align-items: stretch;
  }
  
  .export-controls {
    flex-direction: column;
    align-items: stretch;
  }
}

/* Feature icon SVG styling: size, spacing, and tint via variable */
.feature-card .feature-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.feature-icon {
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-color, #2563eb); /* uses CSS variable if present */
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  display: block;
}

/* Ensure SVG strokes/fills follow currentColor */
.feature-icon svg [stroke] {
  stroke: currentColor;
}
.feature-icon svg [fill] {
  fill: currentColor;
}

.feature-card .feature-head h4 {
  margin: 0;
  font-size: 1rem;
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
  
  .header {
    padding: var(--spacing-md) 0;
  }
  
  .app-title {
    font-size: 1.25rem;
  }
  
  .section-title {
    font-size: 1.25rem;
  }
  
  /* Single column layout */
  .results-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .search-stats {
    grid-template-columns: 1fr;
  }
  
  /* Reduce padding */
  .search-section,
  .genre-section,
  .filter-section,
  .statistics-section,
  .controls-section {
    padding: var(--spacing-md);
  }
  
  .modal-content {
    width: 95%;
    padding: var(--spacing-md);
  }
  
  /* Smaller fonts */
  .book-title {
    font-size: 0.875rem;
  }
  
  .book-author {
    font-size: 0.75rem;
  }
  
  .book-meta {
    font-size: 0.625rem;
  }
  
  /* Ensure touch targets are at least 44x44px */
  .btn,
  .form-select,
  .form-input,
  .genre-btn,
  .btn-detail,
  .select-list {
    min-height: 44px;
    min-width: 44px;
  }
  
  /* Genre buttons full width on mobile */
  .genre-btn {
    flex: 1 1 calc(50% - var(--spacing-sm));
    min-width: 120px;
  }
  
  /* Pagination adjustments */
  .pagination {
    flex-wrap: wrap;
  }
}

/* Large Desktop (1200px and above) */
@media (min-width: 1200px) {
  .container {
    max-width: 1400px;
  }
  
  .results-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

/* Modern card and accent styles for MediFind */
.card.pretty {
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(37,99,235,0.08);
  padding: 18px 16px;
  margin-bottom: 8px;
  border: 1px solid #e0e7ff;
  transition: box-shadow 0.2s;
}
.card.pretty:hover {
  box-shadow: 0 8px 32px rgba(37,99,235,0.16);
  border-color: #2563eb;
}
.card.pretty h3 {
  color: #2563eb;
  font-size: 1.2rem;
  margin-bottom: 6px;
}
.card.pretty .meta {
  color: #64748b;
  font-size: 0.95em;
  margin-bottom: 4px;
}
.card.pretty .small {
  font-size: 0.98em;
  margin-bottom: 4px;
}
.card.pretty .danger {
  background: #fee2e2;
  color: #c23939;
  padding: 2px 6px;
  border-radius: 6px;
}
.card.pretty .actions {
  margin-top: 10px;
  display: flex;
  gap: 10px;
}
.card.pretty .btn {
  font-size: 0.98em;
  padding: 7px 14px;
  border-radius: 8px;
  border: none;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s;
}
.card.pretty .btn.primary {
  background: #2563eb;
}
.card.pretty .btn.btn-view {
  background: #64748b;
}
.card.pretty .btn:hover {
  background: #1e40af;
}
.favorites-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.favorites-list .fav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-primary);
}

.favorites-list .fav-item:last-child { border-bottom: none; }

.favorites-list .fav-info h3 {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-primary);
}
.favorites-list .fav-info .meta {
  color: var(--color-text-secondary);
  font-size: 0.88rem;
  margin-top: 4px;
}

.favorites-list .fav-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.favorites-list .fav-actions .btn {
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.95rem;
}

.favorites-list .fav-actions .btn-view {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.favorites-list .fav-actions .btn-remove {
  background: transparent;
  color: var(--color-error);
  border: 1px solid rgba(239,68,68,0.12);
}
.site-header {
  background: linear-gradient(90deg, #2563eb 0%, #3b82f6 100%);
  color: #fff;
  padding: 48px 0 34px 0; /* slightly larger header */
  border-radius: 0 0 18px 18px;
  margin-bottom: 26px;
}
.site-header h1 {
  color: #fff;
  font-size: 2rem;
  margin-bottom: 4px;
}
.site-header .tagline {
  color: #e0e7ff;
  font-size: 1.1rem;
}
.search-panel {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(37,99,235,0.07);
  padding: 18px 16px;
  margin-bottom: 18px;
}
.search-row input[type="search"] {
  border: 1px solid #2563eb;
  border-radius: 8px;
  padding: 10px;
  font-size: 1.1em;
}
.search-row button {
  background: #2563eb;
  color: #fff;
  border-radius: 8px;
  border: none;
  padding: 10px 18px;
  font-size: 1.1em;
  cursor: pointer;
}
.search-row button:hover {
  background: #1e40af;
}
.controls-flex {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 10px;
  align-items: flex-end;
}
.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 140px;
}
.controls-flex label {
  font-size: 1em;
  color: #2563eb;
}
.controls-flex input[type="text"], .controls-flex select {
  border: 1px solid #e0e7ff;
  border-radius: 8px;
  padding: 8px;
  font-size: 1em;
}
.search-status-row {
  display: flex;
  gap: 18px;
  align-items: center;
  margin-bottom: 8px;
}
.results-section {
  margin-bottom: 18px;
}
.results-grid {
  gap: 18px;
}
.site-footer {
  background: #f8fafc;
  color: #64748b;
  text-align: center;
  padding: 18px 0;
  border-radius: 18px 18px 0 0;
  margin-top: 24px;
}

/* Small accessible spinner and utility */
.hidden { display: none !important; }
.visually-hidden { position: absolute !important; height: 1px; width: 1px; overflow: hidden; clip: rect(1px, 1px, 1px, 1px); white-space: nowrap; border: 0; padding: 0; margin: -1px; }
.spinner { width: 16px; height: 16px; border: 2px solid rgba(37,99,235,0.15); border-top-color: #2563eb; border-radius: 50%; display: none; vertical-align: middle; animation: mf-spin 0.9s linear infinite; }
@keyframes mf-spin { to { transform: rotate(360deg); } }

/* Disabled search button style */
.search-row button[disabled] { opacity: 0.65; cursor: not-allowed; }

/* Small spinner variant for use inside buttons */
.spinner.small { width: 14px; height: 14px; border-width: 2px; }
.btn-spinner { display: inline-flex; align-items: center; margin-left: 8px; }

/* Keep search button stable width and layout while toggling spinner */
.search-row button { background: #2563eb; color: #fff; border-radius: 8px; border: none; padding: 10px 22px; font-size: 1.12em; font-weight: 600; min-width: 120px; box-shadow: 0 2px 8px rgba(37,99,235,0.08); cursor: pointer; display: inline-flex; align-items: center; gap: 8px; justify-content: center; transition: background 0.18s, box-shadow 0.18s; position: relative; }

/* Results grid and equal-height cards */
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.card.pretty { display: flex; flex-direction: column; height: 100%; }
.card.pretty .actions { margin-top: auto; display: flex; gap: 10px; }

/* Multiline truncation utility classes */
.line-clamp-1 { display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; -webkit-line-clamp: 1; line-clamp: 1; max-width: 100%; text-overflow: ellipsis; white-space: normal; }
.line-clamp-2 { display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; -webkit-line-clamp: 2; line-clamp: 2; }
.line-clamp-3 { display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; -webkit-line-clamp: 3; line-clamp: 3; }

/* Overlay spinner for search */
.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.search-overlay.active {
  visibility: visible;
  opacity: 1;
}

.search-overlay .spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Dark Mode Styles */
body.dark-mode {
  background: var(--color-dark-bg);
  color: var(--color-dark-text);
}

.dark-mode .site-header {
  background: linear-gradient(90deg, #23263a 0%, #2563eb 100%);
  color: var(--color-dark-text);
}

/* Dark mode: ensure headings and important text remain high-contrast */
.dark-mode h1,
.dark-mode h2,
.dark-mode h3,
.dark-mode h4,
.dark-mode h5,
.dark-mode h6,
.dark-mode .section-title,
.dark-mode .brand-title,
.dark-mode .brand-text .tagline,
.dark-mode .modal-section-title,
.dark-mode .lead,
.dark-mode .book-title,
.dark-mode .detail-title,
.dark-mode .feature-card h4,
.dark-mode .feature-card p {
  color: var(--color-dark-text) !important;
}

/* Dark-mode adjustments for borders and subtle elements */
.dark-mode .section-title { border-bottom-color: rgba(255,255,255,0.06); }
.dark-mode .main-nav .nav-link { color: var(--color-dark-text); }
.dark-mode .main-nav .nav-link.active { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.06); }


.dark-mode .card.pretty {
  background: linear-gradient(135deg, #23263a 0%, #181a20 100%);
  color: var(--color-dark-text);
  border-color: var(--color-dark-border);
}

.dark-mode .modal-content {
  background: var(--color-dark-modal);
  color: var(--color-dark-text);
}

.dark-mode .btn,
.dark-mode .btn-primary,
.dark-mode .btn-secondary {
  background: var(--color-dark-accent);
  color: #fff;
}

.dark-mode .results-grid {
  background: var(--color-dark-bg);
}

.dark-mode .highlight {
  background: var(--color-highlight);
  color: #181a20;
}

/* Dark-mode: footer and search panel colors and form controls */
.dark-mode .site-footer {
  background: var(--color-dark-card);
  color: var(--color-dark-text);
  box-shadow: none;
  border-top: 1px solid var(--color-dark-border);
}

.dark-mode .search-panel,
.dark-mode .favorites-panel,
.dark-mode .settings-panel {
  background: var(--color-dark-card);
  color: var(--color-dark-text);
  border: 1px solid var(--color-dark-border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.6);
}

.dark-mode .search-row input[type="search"],
.dark-mode .controls-flex input[type="text"],
.dark-mode .controls-flex select,
.dark-mode .controls-flex .form-select,
.dark-mode .form-input {
  background: rgba(255,255,255,0.02);
  color: var(--color-dark-text);
  border: 1px solid var(--color-dark-border);
}

.dark-mode .search-row input::placeholder,
.dark-mode .controls-flex input::placeholder {
  color: rgba(224,231,255,0.6);
}

.dark-mode .search-row button {
  background: var(--color-dark-accent);
  color: #fff;
}

.site-header {
  display: flex;
  flex-direction: column;
  position: relative; /* allow absolute positioning for brand-outside */
}

.header-flex {
  display: flex;
  align-items: center;
  gap: 18px;
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 25;
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

/* Brand/logo layout */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}



/* Place the brand at the far left of the viewport while keeping container centered */
.brand-outside {
  position: absolute;
  left: 8px; /* small gap from edge */
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 30;
}

/* Add left padding to the header container to avoid overlap with the absolute brand */
.site-header > .container {
  padding-left: var(--spacing-md); /* restore normal container padding since logo removed */
}

/* Responsive: on small screens keep brand inline above nav */
@media (max-width: 680px) {
  .brand-outside { position: static; transform: none; margin-bottom: 8px; }
  .site-header > .container { padding-left: var(--spacing-md); }
}

.brand-text h1 {
  font-size: 1.4rem;
  margin: 0;
  line-height: 1;
  color: #fff;
}

.brand-text .tagline {
  margin-top: 2px;
  font-size: 0.96rem;
  color: rgba(255,255,255,0.9);
}

@media (max-width: 680px) {
  .brand-text h1 { font-size: 1.25rem; }
  .brand-text .tagline { font-size: 0.92rem; }
}

/* Prominent brand title (placed before the logo) */
.brand-title {
  font-size: 4.4rem; /* slightly larger brand title */
  font-family: 'Poppins', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin: 0;
  color: #ffffff;
}

@media (max-width: 980px) {
  .brand-title { font-size: 2.2rem; }
}

@media (max-width: 680px) {
  .brand { gap: 10px; }
  .brand-title { font-size: 1.6rem; font-weight: 700; }
}

@media (max-width: 480px) {
  .brand { gap: 8px; }
  .brand-title { font-size: 1.3rem; font-weight: 700; }
}

.dark-mode-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 1em;
  cursor: pointer;
}

.card.pretty {
  min-height: 340px;
  padding: 22px 18px;
  margin-bottom: 16px;
  position: relative;
}

.card-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.tag {
  background: #e0e7ff;
  color: #2563eb;
  border-radius: 8px;
  padding: 2px 10px;
  font-size: 0.92em;
  font-weight: 500;
  display: inline-block;
}

.dark-mode .tag {
  background: #2563eb;
  color: #fff;
}

.highlight {
  background: var(--color-highlight);
  color: #181a20;
  border-radius: 4px;
  padding: 0 2px;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 24px;
  background: var(--color-bg-secondary);
  border-radius: 12px;
  padding: 12px;
}

.modal.app-modal {
  z-index: 10001;
}

.modal-content {
  min-width: 320px;
  font-size: 1.08em;
}

.modal-close {
  font-size: 1.5rem;
}

.favorites-list {
  margin-top: 24px;
  background: #f8fafc;
  border-radius: 12px;
  padding: 12px;
}

.dark-mode .favorites-list {
  background: #23263a;
}

.btn {
  font-size: 1.08em;
  padding: 10px 18px;
  border-radius: 10px;
}

.search-panel {
  margin-bottom: 24px;
}

.search-row input[type="search"] {
  font-size: 1.12em;
  padding: 12px;
}

.search-row button {
  font-size: 1.12em;
  padding: 12px 24px;
}

.controls-flex {
  gap: 24px;
  margin-bottom: 16px;
}

.control-group {
  min-width: 160px;
}

.modal-section-list {
  margin-bottom: 8px;
}

.site-footer {
  margin-top: 32px;
}


/* Removed modal-specific styles for Help and Settings */
.modal {
  display: none;
}
.modal-content {
  display: none;
}

/* Navigation Bar Styles */
.navbar {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 0;
  background: transparent;
}

.nav-link {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--color-text-primary);
  background: transparent;
  font-weight: 600;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.nav-link:hover {
  background: rgba(37,99,235,0.08);
  color: var(--color-primary);
  transform: translateY(-1px);
}

/* Header-specific nav: keep links white for strong contrast against header */
.header-flex .nav-link {
  color: #ffffff;
}

.header-flex .nav-link:hover {
  color: #ffffff;
}

/* Multi-section visibility and navigation styles */
.section {
  display: none;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 240ms ease, transform 240ms ease;
}
.section.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.main-nav .nav-list {
  list-style: none;
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
}
.main-nav .nav-list li { list-style: none; }
.main-nav .nav-link {
  color: #ffffff;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.main-nav .nav-link.active {
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.08);
}

/* Responsive nav: stack on small screens */
@media (max-width: 680px) {
  .main-nav .nav-list { flex-direction: column; gap: 4px; }
  .header-flex { position: static; transform: none; flex-direction: column; align-items: flex-start; gap: 12px; }
  .site-header > .container { padding-left: var(--spacing-md); }
}

/* About page specific styles */
.about-hero { background: linear-gradient(180deg, rgba(37,99,235,0.06) 0%, rgba(255,255,255,0) 100%); padding: 28px 0 8px 0; }
.hero-grid { display: grid; grid-template-columns: 1fr 320px; gap: 18px; align-items: start; }
.hero-card { padding: 16px; }
.lead { font-size: 1.12rem; color: var(--color-text-secondary); margin-bottom: 8px; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 12px; }
.feature-card { padding: 14px; }
.contact-card { margin-top: 18px; padding: 14px; }

@media (max-width: 820px) {
  .hero-grid { grid-template-columns: 1fr; }
}

/* Icons and subtle animations for About page */
.feature-head { display:flex; align-items:center; gap:10px; }
.feature-icon { flex: 0 0 28px; width:28px; height:28px; display:inline-block; }
.hero-illustration { display:flex; align-items:center; justify-content:center; margin-bottom:12px; }
.hero-svg { max-width:160px; height:auto; display:block; }

/* Simple fade-in for hero and feature cards */
.about-hero .container, .features-grid .feature-card, .hero-card { transform: translateY(6px); opacity: 0; animation: mf-fadeup 420ms ease forwards; }
.about-hero .container { animation-delay: 40ms; }
.hero-card { animation-delay: 80ms; }
.features-grid .feature-card { animation-delay: 120ms; }

@keyframes mf-fadeup {
  to { transform: translateY(0); opacity: 1; }
}

/* Full-page entrance animation: add `page-animate` to <body> to animate header/main/footer */
.page-animate > * {
  transform: translateY(8px);
  opacity: 0;
  animation: mf-fadeup 420ms ease forwards;
}
.page-animate > *:nth-child(1) { animation-delay: 20ms; }
.page-animate > *:nth-child(2) { animation-delay: 80ms; }
.page-animate > *:nth-child(3) { animation-delay: 140ms; }

/* Ensure brand title is always visually larger than section titles
   This block is placed at the end to take precedence over earlier rules. */
.site-header .brand-title {
  font-size: 3.6rem; /* reduced from 5.2rem */
  line-height: 1.06;
}

.section-title {
  font-size: 1.6rem;
}

@media (max-width: 980px) {
  .site-header .brand-title { font-size: 2.6rem; }
  .section-title { font-size: 1.5rem; }
}

@media (max-width: 680px) {
  .site-header .brand-title { font-size: 2.2rem; }
  .section-title { font-size: 1.4rem; }
}

@media (max-width: 480px) {
  .site-header .brand-title { font-size: 1.8rem; }
  .section-title { font-size: 1.25rem; }
}

/* Final polish overrides: buttons, inputs, cards, nav spacing for a professional appearance */
.btn {
  border-radius: 10px;
  font-weight: 700;
  padding: 10px 18px;
}

.btn-primary {
  background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-inverse);
  box-shadow: 0 8px 28px rgba(37,99,235,0.12);
  border: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(37,99,235,0.16);
}

.search-row input[type="search"], .form-input, .form-select, .controls-flex input[type="text"], .controls-flex select {
  border: 1px solid rgba(15,23,42,0.06);
  padding: 12px 14px;
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(250,250,250,1) 100%);
  transition: box-shadow 160ms ease, border-color 160ms ease;
}
.search-row input[type="search"]:focus, .form-input:focus, .form-select:focus {
  outline: none;
  border-color: rgba(37,99,235,0.6);
  box-shadow: 0 6px 24px rgba(37,99,235,0.06);
}

.card.pretty {
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(16,24,40,0.04);
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.card.pretty:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(16,24,40,0.08); }

.main-nav .nav-link, .header-flex .nav-link {
  font-size: 0.98rem;
  padding: 10px 14px;
}

/* subtle footer polish */
.site-footer { background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%); border-top: 1px solid rgba(15,23,42,0.03); }

/* Responsive header/nav fixes: ensure stacked, ordered layout on small screens */
@media (max-width: 820px) {
  /* Make header controls flow naturally instead of absolute positioning */
  .header-flex {
    position: static !important;
    transform: none !important;
    top: auto !important;
    right: auto !important;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  /* Brand should sit above nav when space is constrained */
  .brand-outside {
    position: static !important;
    transform: none !important;
    margin-bottom: 8px;
  }

  .site-header > .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .main-nav .nav-list {
    flex-direction: column;
    gap: 6px;
  }

  .main-nav .nav-link {
    display: block;
    width: 100%;
    text-align: left;
    padding: 10px 12px;
    border-radius: 8px;
  }

  .header-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding-top: 6px;
  }

  /* Keep dark-mode toggle aligned to the right inside header-actions */
  .dark-mode-toggle { margin-left: auto; }
}

/* Tight mobile adjustments (phones) */
@media (max-width: 480px) {
  .brand-title { font-size: 1.4rem !important; }

  /* Stack favorites content so buttons move under the title */
  .favorites-list .fav-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 8px 10px;
  }
  .favorites-list .fav-actions {
    width: 100%;
    display: flex;
    justify-content: flex-end;
  }

  /* Make nav links a little larger tappable targets */
  .main-nav .nav-link {
    padding: 12px 14px;
    font-size: 1rem;
  }
}