/* L14 · 顶栏「学习目录」（对齐 L13） */
#l14-book .top-bar .l14-index-link {
  flex: 0 0 auto;
  font-size: clamp(0.72rem, 2vw, 0.82rem);
  font-weight: 800;
  color: var(--l14-accent-ink, #0f766e);
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 10px;
  border: 2px solid var(--l14-accent, #0d9488);
  background: linear-gradient(180deg, #f0fdfa, #ccfbf1);
  box-shadow: 0 2px 0 rgba(13, 148, 136, 0.18);
  white-space: nowrap;
}

#l14-book .top-bar .l14-index-link:hover {
  filter: brightness(1.05);
}

@media (min-width: 720px) {
  #l14-book .top-bar {
    justify-content: space-between;
    text-align: left;
    padding: 8px 14px;
  }
  #l14-book .top-bar .top-bar-main {
    text-align: left;
  }
}