/**
 * Soul创业实验 - 目录页样式
 * 三书同级卡片 + 折叠/展开
 */

.page {
  min-height: 100vh;
  background: #000000;
  padding-bottom: 200rpx;
}

/* ===== 自定义导航栏 ===== */
.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(40rpx);
  -webkit-backdrop-filter: blur(40rpx);
  border-bottom: 1rpx solid rgba(255, 255, 255, 0.05);
}

.nav-content {
  height: 88rpx;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32rpx;
}

.nav-left,
.nav-right {
  width: 64rpx;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-title {
  font-size: 36rpx;
  font-weight: 600;
  flex: 1;
  text-align: center;
}

.search-btn {
  width: 64rpx;
  height: 64rpx;
  border-radius: 50%;
  background: #2c2c2e;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.search-btn:active {
  background: #3c3c3e;
  transform: scale(0.95);
}

.search-icon {
  font-size: 32rpx;
  color: rgba(255, 255, 255, 0.6);
}

.brand-color { color: #00CED1; }

.nav-placeholder { width: 100%; }

/* ===== 目录骨架屏 ===== */
.parts-skeleton {
  padding: 24rpx 32rpx;
  display: flex;
  flex-direction: column;
  gap: 24rpx;
}

.skeleton-book-card {
  display: flex;
  align-items: center;
  gap: 24rpx;
  padding: 36rpx 32rpx;
  background: linear-gradient(135deg, #1c1c1e 0%, #2c2c2e 100%);
  border-radius: 24rpx;
}

.skeleton-book-icon {
  width: 88rpx;
  height: 88rpx;
  border-radius: 22rpx;
  background: linear-gradient(90deg, #1c1c1e 25%, #2c2c2e 50%, #1c1c1e 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  flex-shrink: 0;
}

.skeleton-book-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16rpx;
}

.skeleton-line {
  height: 28rpx;
  background: linear-gradient(90deg, #1c1c1e 25%, #2c2c2e 50%, #1c1c1e 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: 8rpx;
}

.skeleton-title { width: 70%; }
.skeleton-subtitle { width: 50%; }

.skeleton-count {
  width: 72rpx;
  height: 56rpx;
  background: linear-gradient(90deg, #1c1c1e 25%, #2c2c2e 50%, #1c1c1e 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: 12rpx;
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== 目录内容区 ===== */
.chapters-content {
  padding: 16rpx 24rpx;
  width: 100%;
  box-sizing: border-box;
}

/* ===== 书组 ===== */
.book-group {
  margin-bottom: 20rpx;
  border-radius: 28rpx;
  overflow: hidden;
  transition: all 0.3s ease;
}

.book-group--expanded {
  background: rgba(255, 255, 255, 0.02);
  border: 2rpx solid rgba(0, 206, 209, 0.12);
  padding-bottom: 8rpx;
}

/* ===== 书卡片 ===== */
.book-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28rpx 28rpx;
  background: linear-gradient(135deg, #141416 0%, #1e2024 50%, #1a1c20 100%);
  border-radius: 28rpx;
  border: 2rpx solid rgba(0, 206, 209, 0.15);
  position: relative;
  overflow: hidden;
}

.book-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2rpx;
  background: linear-gradient(90deg, transparent, rgba(0, 206, 209, 0.3), transparent);
}

.book-card:active {
  background: linear-gradient(135deg, #1a1c1e 0%, #252830 50%, #202428 100%);
}

.book-card-left {
  display: flex;
  align-items: center;
  gap: 20rpx;
  flex: 1;
  min-width: 0;
}

.book-card-icon {
  width: 88rpx;
  height: 88rpx;
  border-radius: 22rpx;
  background: linear-gradient(135deg, #00CED1 0%, #008B8B 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 6rpx 20rpx rgba(0, 206, 209, 0.25);
}

.book-card-emoji {
  font-size: 44rpx;
  line-height: 1;
}

.book-card-meta {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6rpx;
}

.book-card-title {
  font-size: 30rpx;
  font-weight: 700;
  color: #ffffff;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: 1rpx;
}

.book-card-subtitle {
  font-size: 22rpx;
  color: rgba(255, 255, 255, 0.35);
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-card-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6rpx;
  flex-shrink: 0;
  margin-left: 16rpx;
}

.book-card-stats {
  display: flex;
  align-items: baseline;
  gap: 4rpx;
}

.book-card-count {
  font-size: 40rpx;
  font-weight: 800;
  color: #00CED1;
  line-height: 1.1;
  letter-spacing: -1rpx;
}

.book-card-unit {
  font-size: 20rpx;
  color: rgba(255, 255, 255, 0.35);
  margin-left: 2rpx;
}

.book-card-toggle {
  font-size: 20rpx;
  color: rgba(0, 206, 209, 0.6);
  transition: color 0.2s ease;
}

.toggle-active {
  color: #00CED1;
}

/* ===== 章节项（序言/尾声） ===== */
.chapter-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22rpx 28rpx;
  margin: 0 12rpx 16rpx 12rpx;
  background: rgba(28, 28, 30, 0.7);
  border-radius: 20rpx;
  border: 1rpx solid rgba(255, 255, 255, 0.04);
}

.chapter-item:active {
  background: rgba(44, 44, 46, 0.8);
}

.item-left {
  display: flex;
  align-items: center;
  gap: 20rpx;
  flex: 1;
  min-width: 0;
}

.item-icon {
  width: 56rpx;
  height: 56rpx;
  border-radius: 14rpx;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.item-emoji {
  font-size: 28rpx;
  line-height: 1;
}

.icon-brand {
  background: rgba(0, 206, 209, 0.12);
}

.item-title {
  font-size: 26rpx;
  font-weight: 500;
  color: #ffffff;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.item-right {
  display: flex;
  align-items: center;
  gap: 12rpx;
  flex-shrink: 0;
}

.item-arrow {
  font-size: 28rpx;
  color: rgba(255, 255, 255, 0.4);
}

/* ===== 标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20rpx;
  padding: 4rpx 14rpx;
  min-width: 64rpx;
  border-radius: 8rpx;
  box-sizing: border-box;
  text-align: center;
}

.tag-free {
  background: rgba(0, 206, 209, 0.1);
  color: #00CED1;
}

.tag-new {
  background: rgba(0, 206, 209, 0.15);
  color: #00CED1;
  font-size: 18rpx;
  padding: 2rpx 8rpx;
  margin-left: 8rpx;
}

.tag-vip {
  background: rgba(255, 215, 0, 0.12);
  color: #FFD700;
  font-size: 18rpx;
  padding: 2rpx 8rpx;
  margin-left: 8rpx;
}

.text-brand { color: #00CED1; }
.text-muted { color: rgba(255, 255, 255, 0.4); }
.text-xs { font-size: 22rpx; }

/* ===== 篇章列表 ===== */
.part-list {
  margin: 0 12rpx 16rpx;
}

.part-item {
  margin-bottom: 12rpx;
}

.part-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22rpx 24rpx;
  background: rgba(28, 28, 30, 0.7);
  border-radius: 20rpx;
  border: 1rpx solid rgba(255, 255, 255, 0.04);
}

.part-header:active {
  background: rgba(44, 44, 46, 0.8);
}

.part-left {
  display: flex;
  align-items: center;
  gap: 20rpx;
  flex: 1;
  min-width: 0;
}

.part-icon {
  width: 56rpx;
  height: 56rpx;
  border-radius: 14rpx;
  background: linear-gradient(135deg, #1a2e3e 0%, #0d1b2a 100%);
  border: 1rpx solid rgba(0, 206, 209, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24rpx;
  font-weight: 700;
  color: #ffffff;
  flex-shrink: 0;
}

.part-icon-emoji {
  font-size: 28rpx;
  font-weight: 400;
  line-height: 1;
  background: linear-gradient(135deg, #1a2e3e 0%, #0d1b2a 100%);
  border: 1rpx solid rgba(0, 206, 209, 0.25);
}

.part-icon-img {
  width: 56rpx;
  height: 56rpx;
  border-radius: 14rpx;
  flex-shrink: 0;
}

.part-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
}

.part-title {
  font-size: 27rpx;
  font-weight: 600;
  color: #ffffff;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.part-subtitle {
  font-size: 20rpx;
  color: rgba(255, 255, 255, 0.35);
  margin-top: 4rpx;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.part-right {
  display: flex;
  align-items: center;
  gap: 12rpx;
  flex-shrink: 0;
}

.part-count {
  font-size: 22rpx;
  color: rgba(255, 255, 255, 0.35);
}

.part-arrow {
  font-size: 28rpx;
  color: rgba(255, 255, 255, 0.4);
  transition: transform 0.3s ease;
}

/* ===== 章节组 ===== */
.chapters-list {
  margin-top: 12rpx;
  margin-left: 12rpx;
}

.chapters-loading {
  padding: 24rpx;
  font-size: 24rpx;
  color: rgba(255, 255, 255, 0.5);
}

.chapter-header {
  padding: 14rpx 24rpx;
  font-size: 23rpx;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.5);
  border-bottom: 1rpx solid rgba(255, 255, 255, 0.04);
}

.section-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: 18rpx 24rpx;
  border-bottom: 1rpx solid rgba(255, 255, 255, 0.04);
}

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

.section-item:active {
  background: rgba(255, 255, 255, 0.04);
}

.section-left {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14rpx;
  flex: 1;
  min-width: 0;
}

.section-lock {
  width: 28rpx;
  min-width: 28rpx;
  font-size: 22rpx;
  text-align: center;
  flex-shrink: 0;
}

.section-lock-wrap {
  min-width: 28rpx;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lock-open { color: #00CED1; }
.lock-closed { color: rgba(255, 255, 255, 0.3); }

.section-title {
  font-size: 25rpx;
  color: #ffffff;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.section-price {
  font-size: 22rpx;
  color: rgba(255, 255, 255, 0.45);
}

.tag-purchased {
  background: rgba(0, 206, 209, 0.15);
  color: #00CED1;
}

.section-right {
  display: flex;
  align-items: center;
  gap: 12rpx;
  flex-shrink: 0;
  margin-left: 12rpx;
}

.section-arrow {
  font-size: 24rpx;
  color: rgba(255, 255, 255, 0.3);
}

/* ===== 附录 ===== */
.card {
  background: rgba(28, 28, 30, 0.7);
  border-radius: 20rpx;
  border: 1rpx solid rgba(255, 255, 255, 0.04);
  margin: 0 12rpx 16rpx 12rpx;
  box-sizing: border-box;
}

.appendix-card {
  padding: 20rpx 24rpx;
}

.appendix-title {
  font-size: 23rpx;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.5);
  display: block;
  margin-bottom: 12rpx;
}

.appendix-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14rpx 0;
  border-bottom: 1rpx solid rgba(255, 255, 255, 0.04);
}

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

.appendix-item:active { opacity: 0.7; }

.appendix-text {
  font-size: 23rpx;
  color: rgba(255, 255, 255, 0.7);
}

.appendix-arrow {
  font-size: 24rpx;
  color: rgba(255, 255, 255, 0.3);
}

/* ===== 展开三角 ===== */
.section-expand-trigger {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16rpx 0 10rpx;
}

.latest-expand-triangle {
  width: 0;
  height: 0;
  border-left: 16rpx solid transparent;
  border-right: 16rpx solid transparent;
  border-top: 12rpx solid rgba(0, 206, 209, 0.5);
  opacity: 0.85;
  transform-origin: 50% 0;
  transition: border-top-color 0.15s ease;
}

.section-expand-trigger:active .latest-expand-triangle {
  border-top-color: #00CED1;
}

@keyframes catalog-tri-nudge {
  0% { transform: translateY(0) scale(1); opacity: 0.85; }
  40% { transform: translateY(10rpx) scale(1.12); opacity: 1; border-top-color: #00CED1; }
  100% { transform: translateY(0) scale(1); opacity: 0.85; }
}

.latest-expand-triangle.tri-bounce {
  animation: catalog-tri-nudge 0.45s ease-out;
}

/* ===== 底部留白 ===== */
.bottom-space {
  height: 40rpx;
}