/**
 * SPRASH e-Library – Books & Reader Styles
 * ===========================================
 * Styles for the library browsing page and
 * the PDF reader/book detail page.
 */

/* ─── Library Page ─────────────────────────── */
.library-hero {
  padding-top: calc(var(--navbar-height) + var(--space-10));
  padding-bottom: var(--space-10);
  background: linear-gradient(135deg, var(--color-sky-blue-light) 0%, var(--color-white) 60%, var(--color-green-light) 100%);
}

.library-hero__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--space-2);
}

.library-hero__subtitle {
  text-align: center;
  color: var(--color-gray-500);
  font-size: var(--text-lg);
  margin-bottom: var(--space-8);
}

/* ─── Search & Filters ─────────────────────── */
.search-section {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-8);
  box-shadow: var(--shadow-lg);
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 10;
  margin-bottom: calc(-1 * var(--space-8));
  transform: translateY(var(--space-4));
}

.search-bar {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.search-bar__input-wrapper {
  flex: 1;
  position: relative;
}

.search-bar__icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  font-size: var(--text-lg);
  color: var(--color-gray-400);
  pointer-events: none;
}

.search-bar__input {
  width: 100%;
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-12);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  color: var(--color-gray-800);
  background: var(--color-gray-50);
  transition: all var(--transition-fast);
}

.search-bar__input:focus {
  outline: none;
  border-color: var(--color-deep-blue);
  background: var(--color-white);
  box-shadow: 0 0 0 4px rgba(21, 101, 192, 0.1);
}

.search-bar__input::placeholder {
  color: var(--color-gray-400);
}

.search-bar__btn {
  padding: var(--space-3) var(--space-6);
  background: linear-gradient(135deg, var(--color-deep-blue) 0%, var(--color-deep-blue-dark) 100%);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.search-bar__btn:hover {
  box-shadow: 0 4px 14px rgba(21, 101, 192, 0.35);
  transform: translateY(-1px);
}

.filters {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  flex-wrap: wrap;
}

.filters__label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-gray-600);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.filters__select {
  padding: var(--space-2) var(--space-4);
  padding-right: var(--space-8);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  background: var(--color-white);
  cursor: pointer;
  transition: all var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.filters__select:focus {
  outline: none;
  border-color: var(--color-deep-blue);
}

.filters__clear {
  font-size: var(--text-sm);
  color: var(--color-deep-blue);
  cursor: pointer;
  font-weight: 500;
  transition: color var(--transition-fast);
  background: none;
  border: none;
  padding: var(--space-2) var(--space-3);
}

.filters__clear:hover {
  color: var(--color-deep-blue-dark);
  text-decoration: underline;
}

/* ─── Books Grid ───────────────────────────── */
.books-section {
  padding: var(--space-16) 0 var(--space-20);
  background: var(--color-gray-50);
  min-height: 60vh;
}

.books-section__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-8);
}

.books-section__count {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  font-weight: 500;
}

.books-section__count strong {
  color: var(--color-gray-800);
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-6);
}

/* ─── Book Detail / Reader Page ────────────── */
.reader-page {
  padding-top: var(--navbar-height);
  min-height: 100vh;
  background: var(--color-gray-50);
}

.reader-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--space-4) 0;
}

.reader-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.reader-header__back {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-600);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.reader-header__back:hover {
  color: var(--color-deep-blue);
  background: var(--color-sky-blue-light);
}

.reader-header__title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-gray-800);
  flex: 1;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.reader-header__controls {
  display: flex;
  gap: var(--space-2);
}

.reader-control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  color: var(--color-gray-600);
  font-size: var(--text-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--color-white);
}

.reader-control-btn:hover {
  border-color: var(--color-deep-blue);
  color: var(--color-deep-blue);
  background: var(--color-sky-blue-light);
}

/* Reader content area */
.reader-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-6);
  padding: var(--space-6) 0;
  min-height: calc(100vh - var(--navbar-height) - 72px);
}

.reader-content--fullscreen {
  grid-template-columns: 1fr;
}

.reader-content--fullscreen .reader-sidebar {
  display: none;
}

/* PDF Viewer */
.pdf-viewer {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.pdf-viewer__toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-gray-50);
  border-bottom: 1px solid var(--color-gray-200);
}

.pdf-viewer__page-info {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  font-weight: 500;
  min-width: 100px;
  text-align: center;
}

.pdf-viewer__frame {
  flex: 1;
  width: 100%;
  min-height: 700px;
  border: none;
}

.pdf-viewer__empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-16);
  text-align: center;
}

.pdf-viewer__empty-icon {
  font-size: 4rem;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.pdf-viewer__empty-title {
  font-size: var(--text-xl);
  color: var(--color-gray-600);
  margin-bottom: var(--space-2);
}

.pdf-viewer__empty-text {
  font-size: var(--text-base);
  color: var(--color-gray-400);
  max-width: 400px;
}

/* Reader sidebar with book info */
.reader-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.reader-sidebar__card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
}

.reader-sidebar__cover {
  width: 100%;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.reader-sidebar__title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.reader-sidebar__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.reader-sidebar__meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-gray-100);
}

.reader-sidebar__meta-item:last-child {
  border-bottom: none;
}

.reader-sidebar__meta-icon {
  font-size: var(--text-lg);
  color: var(--color-deep-blue);
  width: 24px;
  text-align: center;
}

.reader-sidebar__meta-label {
  font-size: var(--text-xs);
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.reader-sidebar__meta-value {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-700);
}

.reader-sidebar__desc {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  line-height: 1.7;
  margin-top: var(--space-3);
}

/* Related books */
.related-books__title {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-4);
  color: var(--color-gray-800);
}

.related-book-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  margin-bottom: var(--space-2);
}

.related-book-item:hover {
  background: var(--color-sky-blue-light);
}

.related-book-item__cover {
  width: 48px;
  height: 64px;
  border-radius: var(--radius-sm);
  object-fit: cover;
  flex-shrink: 0;
}

.related-book-item__info {
  flex: 1;
  min-width: 0;
}

.related-book-item__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-gray-700);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.related-book-item__class {
  font-size: var(--text-xs);
  color: var(--color-gray-400);
}

/* ─── Responsive ───────────────────────────── */
@media (max-width: 1024px) {
  .reader-content {
    grid-template-columns: 1fr;
  }
  
  .reader-sidebar {
    flex-direction: row;
    overflow-x: auto;
  }
  
  .reader-sidebar__card {
    min-width: 300px;
  }
}

@media (max-width: 768px) {
  .search-section {
    padding: var(--space-4) var(--space-5);
    margin: 0 var(--space-4);
  }
  
  .search-bar {
    flex-direction: column;
  }
  
  .filters {
    flex-direction: column;
    align-items: stretch;
  }
  
  .books-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-4);
  }
  
  .reader-header__inner {
    flex-wrap: wrap;
  }
  
  .reader-header__title {
    order: 3;
    flex-basis: 100%;
    text-align: left;
  }
  
  .reader-sidebar {
    flex-direction: column;
  }
  
  .reader-sidebar__card {
    min-width: auto;
  }
  
  .pdf-viewer__frame {
    min-height: 450px;
  }
}

@media (max-width: 480px) {
  .books-grid {
    grid-template-columns: 1fr;
  }
  
  .books-section__header {
    flex-direction: column;
    gap: var(--space-3);
    align-items: flex-start;
  }
}

/* ─── Theme Overrides for Books/Reader ────── */
[data-theme="dark"] .library-hero,
[data-theme="dark"] .reader-page {
  background: var(--color-gray-50);
}

[data-theme="dark"] .library-hero {
  background: linear-gradient(135deg, #16162a 0%, #1a1a2e 60%, #1e1e36 100%);
}

[data-theme="dark"] .search-section {
  background: #1a1a2e;
}

[data-theme="dark"] .search-bar__input {
  background: #252542;
  border-color: #2e2e50;
  color: #e8e8f0;
}

[data-theme="dark"] .search-bar__input::placeholder {
  color: #8888a8;
}

[data-theme="dark"] .books-section {
  background: var(--color-gray-50);
}

[data-theme="dark"] .reader-header {
  background: #1a1a2e;
  border-bottom-color: #2e2e50;
}

[data-theme="dark"] .pdf-viewer {
  background: #1a1a2e;
}

[data-theme="dark"] .reader-sidebar__card {
  background: #1a1a2e;
}

[data-theme="dark"] .reader-control-btn {
  background: #1a1a2e;
  border-color: #2e2e50;
  color: #a0a0be;
}

[data-theme="dark"] .filters__select {
  background-color: #252542;
  border-color: #2e2e50;
  color: #e8e8f0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0a0be' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
}

/* Dark Blue theme overrides */
[data-theme="dark-blue"] .library-hero,
[data-theme="dark-blue"] .reader-page {
  background: var(--color-gray-50);
}

[data-theme="dark-blue"] .library-hero {
  background: linear-gradient(135deg, #071422 0%, #0a1929 60%, #0d2137 100%);
}

[data-theme="dark-blue"] .search-section {
  background: #0a1929;
}

[data-theme="dark-blue"] .search-bar__input {
  background: #122a44;
  border-color: #1a3550;
  color: #e3ecf4;
}

[data-theme="dark-blue"] .search-bar__input::placeholder {
  color: #6e8baa;
}

[data-theme="dark-blue"] .books-section {
  background: var(--color-gray-50);
}

[data-theme="dark-blue"] .reader-header {
  background: #0a1929;
  border-bottom-color: #1a3550;
}

[data-theme="dark-blue"] .pdf-viewer {
  background: #0a1929;
}

[data-theme="dark-blue"] .reader-sidebar__card {
  background: #0a1929;
}

[data-theme="dark-blue"] .reader-control-btn {
  background: #0a1929;
  border-color: #1a3550;
  color: #8eaac4;
}

[data-theme="dark-blue"] .filters__select {
  background-color: #122a44;
  border-color: #1a3550;
  color: #e3ecf4;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238eaac4' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
}