/* ===== 章节选择器（专辑）：图标 + 章节序号 + 章节名 ===== */
.chapter-tabs {
  display: flex;
  gap: 10px;
  padding: 10px 12px;
  margin: 8px 12px 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  scroll-snap-type: x mandatory;
  background: var(--gc-card);
  border-radius: 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.chapter-tabs::-webkit-scrollbar { display: none; }

.chapter-tab {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 60px;
  height: 64px;
  border-radius: 8px;
  background: rgba(0,0,0,0.03);
  color: var(--gc-foreground);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  white-space: nowrap;
  scroll-snap-align: start;
  position: relative;
}
.chapter-tab:first-child { margin-left: 4px; }
.chapter-tab:last-child { margin-right: 4px; }
.chapter-tab:hover {
  transform: translateY(-1px);
  border-color: rgba(255,140,66,0.3);
  box-shadow: 0 4px 12px rgba(255,140,66,0.15);
}
.chapter-tab:active {
  transform: translateY(0) scale(0.96);
}
.chapter-tab.active {
  background: linear-gradient(160deg, #FFB347 0%, #FF8C42 100%);
  color: white;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(255,140,66,0.3);
}
.chapter-tab.active .chapter-num { opacity: 0.85; }

.chapter-icon {
  font-size: 22px;
  line-height: 1;
  filter: drop-shadow(0 1px 3px rgba(0,0,0,0.12));
}
.chapter-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.1;
  gap: 2px;
}
.chapter-num {
  font-size: 9px;
  font-weight: 700;
  opacity: 0.6;
  letter-spacing: 0.3px;
}
.chapter-name {
  font-size: 11px;
  font-weight: 800;
}
.chapter-tab.active .chapter-num { opacity: 0.85; }