.book-detail-page {
  padding-top: 24px;
  padding-bottom: 56px;
}

.book-topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.book-topbar .search-input-wrap {
  max-width: 370px;
  width: 100%;
}

.book-detail-main {
  display: grid;
  grid-template-columns: 184px minmax(0, 1fr);
  gap: 22px;
  padding: 24px;
  border-radius: 16px;
  background: #fff;
}

.book-cover {
  width: 100%;
  border-radius: 20px;
  object-fit: cover;
}

.book-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 32px;
}

.book-title {
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
  font-weight: 500;
}

.book-author {
  margin: 8px 0 0;
  font-size: 16px;
  color: var(--color-gray-500);
}

.book-actions {
  display: flex;
  gap: 8px;
}

.book-icon-btn {
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 10px;
  background: #f5f5f5;
  color: #c4c4c4;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.book-icon-btn path {
  fill: #D6D6D6;
}

.book-icon-btn:hover {
  background: #EBEBEB;
}

.book-icon-btn:hover svg path {
    fill: #ADADAD;
}

.book-icon-btn.book-icon-btn--heart.active {
  background: #F9E2E2;
}

.book-icon-btn.book-icon-btn--heart.active svg path {
    fill: #B41E23;
}
.book-cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

/* Сегментированный переключатель «Читать» / «Слушать» */
.book-mode-toggle {
  display: inline-flex;
  width: 100%;
  max-width: 360px;
  gap: 4px;
  border-radius: 999px;
  background: #F7F7F7;
  box-sizing: border-box;
}

.book-mode-toggle__btn {
  flex: 1 1 50%;
  min-width: 0;
  border: 0;
  border-radius: 999px;
  padding: 15.4px 16px;
  font-size: 16px;
  font-weight: 500;
  font-family: inherit;
  line-height: 1.2;
  color: var(--color-main);
  background: transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.book-mode-toggle__btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.book-mode-toggle__btn.is-active {
  background: var(--color-primary);
  color: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06);
}

.book-mode-toggle__btn:not(.is-active):hover {
  background: var(--color-primary-hover);
}

.book-mode-toggle__icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
}

.book-mode-toggle__icon path {
  fill: #adadad;
  transition: fill 0.2s ease;
}

.book-mode-toggle__btn.is-active .book-mode-toggle__icon path {
  fill: #fff;
}

.meta-title {
  margin: 0 0 16px;
  font-size: 20px;
  font-weight: 500;
}

hr {
    color: #E0E0E0;
    opacity: 1;
    margin: 32px 0;
}


.book-meta-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 8px 26px;
}

.meta-item {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 10px;
}

.meta-label {
  color: var(--color-gray-500);
  font-size: 16px;
}

.meta-value {
  color: var(--color-main);
  font-size: 16px;
}

.meta-value a {
    color: var(--color-blue) !important;
}

.meta-value--doi {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.doi-copy-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  line-height: 0;
  vertical-align: middle;
}

.doi-copy-btn:hover {
  opacity: 0.85;
}

.doi-copy-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.doi-copy-btn img {
  display: block;
}

.book-description h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 500;
}

.book-description__body {
  position: relative;
}

.book-description__text {
  margin: 0;
  color: var(--color-main);
  font-size: 16px;
  line-height: 1.5;
}

.book-description__text.is-collapsed {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.book-description__toggle {
  margin: 8px 0 0;
  padding: 0;
  border: 0;
  background: transparent;
  color: #999999;
  font-size: 16px;
  font-family: inherit;
  line-height: 1.5;
  cursor: pointer;
  text-align: left;
}

.book-description__toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.book-tabs {
  display: flex;
  gap: 8px;
  margin-top: 40px;
}

.book-tab {
  border: 0;
  border-radius: 10px;
  padding: 13px 16px;
  background: var(--color-gray-hover);
  color: var(--color-main);
  font-size: 16px;
  font-family: inherit;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.book-tab.active {
  background: var(--color-primary-hover);
  color: var(--color-primary);
}

.book-tab-panels {
  margin-top: 10px;
}

.book-tab-panel {
  display: none;
}

.book-tab-panel.is-active {
  display: block;
}

.book-tab-empty {
  margin: 0;
  padding: 24px;
  color: var(--color-gray-500);
  font-size: 16px;
}

/* Список связанных материалов */
.book-related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.book-related-item {
  margin: 0;
  padding: 0;
}

.book-related-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border-radius: 14px;
  border: 1px solid #e8e8e8;
  background: #fff;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.book-related-link:hover {
  border-color: #d8d8d8;
  background: #fafafa;
}

.book-related-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  overflow: hidden;
}

.book-related-icon img {
  display: block;
  width: 48px;
  height: 48px;
}

.book-related-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.book-related-title {
  font-size: 16px;
  font-weight: 500;
  color: #2d2d2d;
  line-height: 1.3;
}

.book-related-sub {
  font-size: 14px;
  color: #999999;
  line-height: 1.3;
}

.book-biblio {
  margin-top: 10px;
}

.book-cite {
  margin-top: 0;
  border-radius: 20px;
  background: white;
  padding: 20px;
  color: var(--color-main);
  font-size: 16px;
}

.book-cite .material-card {
    border: 1px solid var(--color-gray-hover);
}

.book-biblio-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.book-biblio-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 0;
  background: var(--color-gray-300);
  color: var(--color-main);
  font-size: 16px;
  font-family: inherit;
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.book-biblio-btn:hover {
  background: #e0e0e0;
  color: var(--color-main);
}

.book-biblio-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.book-biblio-btn__icon {
  flex-shrink: 0;
  display: block;
}

.license-tooltip-wrap {
  position: relative;
  display: inline-block;
}

.license-tooltip {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 8px;
  padding: 14px 18px;
  min-width: 260px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  z-index: 100;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.license-tooltip-wrap:hover .license-tooltip {
  visibility: visible;
  opacity: 1;
}

.license-tooltip__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-main);
  line-height: 1.3;
}

.license-tooltip__text {
  font-size: 14px;
  color: #7B7B7B;
  line-height: 1.4;
}

/* Модальное окно «Поделиться» */
.share-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  visibility: hidden;
  opacity: 0;
  transition: visibility 0.2s ease, opacity 0.2s ease;
}

.share-modal.is-open {
  visibility: visible;
  opacity: 1;
}

.share-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
}

.share-modal__box {
  position: relative;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  padding: 20px 24px;
  min-width: 360px;
  max-width: 100%;
}

.share-modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.share-modal__title {
  margin: 0;
  font-size: 24px;
  font-weight: 500;
  color: var(--color-main);
}

.share-modal__close {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.share-modal__close:hover {
  background: #f5f5f5;
}

.share-modal__body {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: flex-start;
}

.share-modal__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #666;
  font-size: 13px;
  line-height: 1.3;
  text-align: center;
  min-width: 70px;
}

.share-modal__item:hover {
  color: #2d2d2d;
}

.share-modal__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  overflow: hidden;
}

.share-modal__icon--copy {
  background: #F7F7F7;
}

.share-modal__icon--copy img {
  width: 24px;
  height: 24px;
}

.share-modal__icon--social img {
  width: 48px;
  height: 48px;
}

.share-modal__label {
  white-space: pre-line;
  color: #ADADAD;
}

/* Модальное окно для неавторизованных пользователей */
.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  visibility: hidden;
  opacity: 0;
  transition: visibility 0.2s ease, opacity 0.2s ease;
}

.auth-modal.is-open {
  visibility: visible;
  opacity: 1;
}

.auth-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
}

.auth-modal__box {
  position: relative;
  background: #fff;
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  padding: 32px 40px 24px;
  min-width: 440px;
  max-width: 100%;
}

.auth-modal__close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.auth-modal__close:hover {
  background: #f5f5f5;
}

.auth-modal__text {
  margin: 0 0 24px;
  font-size: 20px;
  font-weight: 500;
  color: var(--color-main);
  text-align: center;
}

.auth-modal__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.auth-modal__btn {
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background-color 0.2s ease, color 0.2s ease;
  border: 0;
}

.auth-modal__btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.auth-modal__btn--primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-primary);
}

.auth-modal__btn--cancel {
  background: #F7F7F7;
  color: #2d2d2d;
}

.auth-modal__btn--cancel:hover {
  background: #ebebeb;
}

/* Аудио-аккордеон и кастомный плеер */
.audio-accordion {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.audio-lesson {
  border: 1px solid #e8e8e8;
  border-radius: 14px;
  background: #fff;
  overflow: hidden;
}

.audio-lesson__header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
  border: none;
  background: transparent;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  position: relative;
  padding: 12px 52px 12px 12px;
}

.audio-lesson__header:hover {
  background: #fafafa;
}

.audio-lesson__title {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-main);
  margin-bottom: 4px;
}

.audio-lesson__count {
  font-size: 16px;
  color: var(--color-gray-500);
  font-weight: 400;
}

.audio-lesson__count span {
    color: var(--color-main);
}

.audio-lesson__chevron {
  position: absolute;
  top: 50%;
  right: 16px;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: #F7F7F7;
  transition: background-color 0.2s ease;
}

.audio-lesson__header[aria-expanded="true"] .audio-lesson__chevron {
  background: #EBEBEB;
}

.audio-lesson__chevron-icon {
  display: block;
  transition: transform 0.2s ease;
}

.audio-lesson__header[aria-expanded="true"] .audio-lesson__chevron-icon {
  transform: rotate(180deg);
}

.audio-lesson:has(.audio-lesson__header[aria-expanded="true"]) {
  background: #F7F7F7;
}

.audio-lesson__body {
  padding: 8px 12px 12px 12px;
}

.audio-track {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  flex-wrap: wrap;
  background: white;
  margin-bottom: 10px;
  border-radius: 12px;
}

.audio-track:last-child {
  margin-bottom: 0;
}

.audio-track__label {
  font-size: 15px;
  font-weight: 500;
  color: #2d2d2d;
  min-width: 90px;
}

.audio-track__play {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0;
  background: transparent;
  color: #1a1a1a;
  cursor: pointer;
  padding: 0;
}

.audio-track__play:hover {
  color: var(--color-primary);
}

.audio-track__play:focus-visible,
.audio-lesson__header:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.audio-track__play-icon,
.audio-track__pause-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.audio-track__pause-icon[hidden] {
  display: none;
}

.audio-track__play-icon[hidden] {
  display: none;
}

.audio-track__time {
  font-size: 13px;
  color: #999;
  min-width: 80px;
}

.audio-track__progress {
  flex: 1;
  min-width: 80px;
  height: 4px;
  background: #e8e8e8;
  border-radius: 2px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
}

.audio-track__progress-fill {
  height: 100%;
  width: 0%;
  background: var(--color-primary);
  border-radius: 2px;
  transition: width 0.05s linear;
}

.audio-track.is-playing .audio-track__progress-fill {
  background: var(--color-primary);
}

.audio-track__speed {
  flex-shrink: 0;
  min-width: 36px;
  padding: 4px 6px;
  font-size: 13px;
  color: #999;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  border-radius: 4px;
}

.audio-track__speed:hover {
  color: #2d2d2d;
}

.audio-track__speed:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.audio-track__volume {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  color: #1a1a1a;
}

.audio-track__volume-input {
  width: 64px;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: #e8e8e8;
  border-radius: 2px;
  outline: none;
}

.audio-track__volume-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #1a1a1a;
  cursor: pointer;
}

.audio-track__volume-input::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #1a1a1a;
  cursor: pointer;
  border: 0;
}

.audio-track__volume-icon {
  display: flex;
  align-items: center;
}

.recommend {
  margin-top: 80px;
}

.recommend h2 {
  font-size: 20px;
  margin: 0 0 16px;
  font-weight: 500;
}


@media (max-width: 1200px) {
  .recommend-cards {
    grid-template-columns: repeat(3, minmax(170px, 1fr));
  }
}

@media (max-width: 900px) {
  .book-detail-main {
    grid-template-columns: 1fr;
  }

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