:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-card: #1c2128;
  --bg-card-hover: #22272e;
  
  --border-color: #30363d;
  --border-focus: #58a6ff;
  
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  
  --accent-primary: #238636;
  --accent-primary-hover: #2ea043;
  --accent-blue: #1f6feb;
  --accent-blue-hover: #388bfd;
  --accent-purple: #8957e5;
  --accent-amber: #d29922;
  --accent-red: #f85149;
  
  --badge-pdf: #da3633;
  --badge-epub: #238636;
  --badge-mobi: #d29922;
  --badge-djvu: #8957e5;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
  
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-primary: #f6f8fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #eaeef2;
  --bg-card: #ffffff;
  --bg-card-hover: #f3f4f6;
  
  --border-color: #d0d7de;
  --border-focus: #0969da;
  
  --text-primary: #1f2328;
  --text-secondary: #57606a;
  --text-muted: #8c959f;
  
  --accent-primary: #1f883d;
  --accent-primary-hover: #1a7f37;
  --accent-blue: #0969da;
  --accent-blue-hover: #085fc4;
  
  --shadow-sm: 0 1px 3px rgba(31,35,40,0.08);
  --shadow-md: 0 4px 12px rgba(31,35,40,0.12);
  --shadow-lg: 0 8px 24px rgba(31,35,40,0.15);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.header-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), #238636);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  box-shadow: var(--shadow-sm);
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  background-color: var(--bg-tertiary);
  color: var(--accent-blue);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  letter-spacing: 0.5px;
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  background-color: var(--bg-tertiary);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.nav-tab:hover {
  color: var(--text-primary);
}

.nav-tab.active {
  background-color: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.nav-tab-badge {
  font-size: 0.75rem;
  background-color: var(--accent-blue);
  color: white;
  padding: 0.1rem 0.45rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.btn-icon:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background-color: var(--bg-card-hover);
}

.mirror-status-indicator {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  background-color: var(--bg-tertiary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  cursor: pointer;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: #238636;
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(35, 134, 54, 0.6);
}

/* Main Container */
.main-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 2rem 1.5rem 6rem;
  width: 100%;
  flex: 1;
}

/* Search Hero */
.search-hero {
  margin-bottom: 2rem;
  text-align: center;
}

.hero-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.search-box-wrapper {
  max-width: 850px;
  margin: 0 auto;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.search-box-wrapper:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.search-input-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-field-select {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.85rem;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  outline: none;
}

.search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.05rem;
  padding: 0.65rem 0.5rem;
  outline: none;
  min-width: 0;
}

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

.btn-clear {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.4rem;
  font-size: 1rem;
  display: none;
}

.btn-clear:hover {
  color: var(--text-primary);
}

.btn-search {
  background-color: var(--accent-blue);
  color: white;
  border: none;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
}

.btn-search:hover {
  background-color: var(--accent-blue-hover);
}

/* Category & Filter Tabs */
.search-controls {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.category-chip {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.category-chip:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.category-chip.active {
  background-color: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-blue);
  font-weight: 500;
}

.filters-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding-top: 0.5rem;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.filter-select {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

/* Suggestions tags */
.preset-tags {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.preset-tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.preset-tag:hover {
  color: var(--accent-blue);
  border-color: var(--accent-blue);
}

/* Results Section */
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.results-count {
  font-size: 1rem;
  color: var(--text-secondary);
}

.results-count b {
  color: var(--text-primary);
}

.view-toggles {
  display: flex;
  gap: 0.25rem;
  background-color: var(--bg-tertiary);
  padding: 0.2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.btn-view-toggle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
}

.btn-view-toggle.active {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

/* Book Grid (Cards) */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.book-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.book-card:hover {
  transform: translateY(-3px);
  border-color: var(--text-muted);
  box-shadow: var(--shadow-md);
}

.book-cover-wrap {
  height: 220px;
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

.book-cover-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 0.5rem;
  transition: transform 0.3s ease;
}

.book-card:hover .book-cover-img {
  transform: scale(1.03);
}

.book-cover-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 2.5rem;
  padding: 1rem;
  text-align: center;
}

.book-format-badge {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  color: white;
  background-color: var(--accent-blue);
  box-shadow: var(--shadow-sm);
}

.format-pdf { background-color: var(--badge-pdf); }
.format-epub { background-color: var(--badge-epub); }
.format-mobi { background-color: var(--badge-mobi); }
.format-djvu { background-color: var(--badge-djvu); }

.book-card-body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.book-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.35;
}

.book-author {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
  padding-bottom: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.meta-pill {
  background-color: var(--bg-tertiary);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

.book-card-actions {
  display: flex;
  gap: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

.btn-card-action {
  flex: 1;
  padding: 0.45rem 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

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

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

.btn-save-local {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-save-local:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--border-focus);
}

/* Books List / Table View */
.books-table-wrapper {
  overflow-x: auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.books-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.85rem;
}

.books-table th {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.books-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.books-table tr:hover td {
  background-color: var(--bg-card-hover);
}

.table-cover {
  width: 36px;
  height: 48px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--bg-tertiary);
}

.table-actions {
  display: flex;
  gap: 0.4rem;
}

/* Loading & Skeletons */
.loading-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-secondary);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

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

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-secondary);
}

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

/* Pagination */
.pagination-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2rem;
}

.btn-page {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-page:hover:not(:disabled) {
  border-color: var(--border-focus);
  color: var(--accent-blue);
}

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

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

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

.modal-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 700px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.96);
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-card {
  transform: scale(1);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.25rem;
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
}

.modal-book-layout {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.modal-book-cover {
  width: 150px;
  height: 210px;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.modal-book-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.modal-book-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
}

.modal-book-author {
  color: var(--accent-blue);
  font-size: 0.95rem;
}

.modal-meta-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem 1rem;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.modal-meta-grid b {
  color: var(--text-primary);
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.btn-modal-primary {
  background-color: var(--accent-primary);
  color: white;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-modal-primary:hover {
  background-color: var(--accent-primary-hover);
}

.btn-modal-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-modal-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--border-focus);
}

/* Download Manager Floating Tray */
.download-tray {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 360px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 150;
  display: none;
  overflow: hidden;
  transition: var(--transition);
}

.download-tray.active {
  display: block;
  animation: slideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.download-tray-header {
  padding: 0.75rem 1rem;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 600;
}

.download-tray-items {
  max-height: 250px;
  overflow-y: auto;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.download-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.65rem;
  font-size: 0.8rem;
}

.download-item-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.4rem;
}

.download-item-title {
  font-weight: 600;
  color: var(--text-primary);
  max-width: 260px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.download-progress-bar {
  height: 6px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.download-progress-fill {
  height: 100%;
  background-color: var(--accent-blue);
  width: 0%;
  transition: width 0.2s ease;
}

.download-item-bottom {
  display: flex;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* Local Library View */
.library-hero-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.library-stats {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.library-stats b {
  color: var(--text-primary);
}

.library-actions {
  display: flex;
  gap: 0.75rem;
}

/* Mirror Status Modal Grid */
.mirror-status-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mirror-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.mirror-name {
  font-weight: 600;
  color: var(--text-primary);
}

.mirror-url {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mirror-status-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}

.badge-online {
  background-color: rgba(35, 134, 54, 0.2);
  color: #2ea043;
}

.badge-offline {
  background-color: rgba(248, 81, 73, 0.2);
  color: #f85149;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  animation: slideInRight 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Responsive Breakpoints */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    align-items: stretch;
  }
  
  .nav-tabs {
    order: 3;
  }

  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
  }

  .book-cover-wrap {
    height: 160px;
  }

  .modal-book-layout {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .modal-meta-grid {
    grid-template-columns: 1fr;
  }

  .download-tray {
    width: calc(100% - 2rem);
    left: 1rem;
    right: 1rem;
  }
}