.anchor-nav {
  display: block;
}

/* 1px(非零面积)以确保 IntersectionObserver 可靠触发;-1px margin 抵消布局占位 */
.anchor-nav__sentinel {
  display: block;
  height: 1px;
  margin: 0 0 -1px;
  padding: 0;
}

/* 占位:dock 进 header 后,保留原位高度,防止页面跳动 */
.anchor-nav__placeholder {
  margin: 0;
  padding: 0;
}

/* ============ 默认态:页面里的图文卡片(圆图在上、标题在下) ============ */
.anchor-nav__bar {
  background-color: rgb(var(--color-page-background));
}

.anchor-nav--full {
  padding: 0 16px;
}

.anchor-nav__scroll {
  display: flex;
  flex-wrap: nowrap;
  gap: 28px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  touch-action: pan-x;
  scrollbar-width: none;
  padding: 6px 0;
}

.anchor-nav__scroll::-webkit-scrollbar {
  display: none;
}

.anchor-nav__scroll--center {
  justify-content: safe center;
}

.anchor-nav__scroll--left {
  justify-content: flex-start;
}

/* 单个锚点:卡片(列向,居中) */
.anchor-nav__item {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  width: 96px;
  text-decoration: none;
  color: rgb(var(--color-text));
  cursor: pointer;
}

.anchor-nav__thumb {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  overflow: hidden;
  background-color: rgba(var(--color-text), 0.05);
  border: 2px solid transparent;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.anchor-nav__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.anchor-nav__label {
  font-size: 13px;
  font-weight: 600;
  line-height: 1.25;
  text-align: center;
  white-space: normal;
  word-break: break-word;
}

.anchor-nav__item:hover .anchor-nav__thumb {
  transform: translateY(-2px);
  border-color: rgba(var(--color-text), 0.25);
}

.anchor-nav__item.is-active .anchor-nav__thumb {
  border-color: rgb(var(--color-text));
}

/* ============ dock 态:并入 header,变紧凑文字 tab(隐藏圆图) ============ */
.anchor-nav__bar--in-header {
  background-color: transparent;
  border-top: 1px solid rgba(var(--color-text), 0.08);
  box-shadow: 0 4px 14px rgba(var(--color-text), 0.05);
  animation: anchorNavDrop 0.18s ease;
}

@keyframes anchorNavDrop {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.anchor-nav__bar--in-header .anchor-nav__scroll {
  gap: 4px;
  padding: 0;
}

.anchor-nav__bar--in-header .anchor-nav__item {
  flex-direction: row;
  width: auto;
  gap: 0;
  padding: 11px 16px;
  border-bottom: 2px solid transparent;
  color: rgba(var(--color-text), 0.6);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.anchor-nav__bar--in-header .anchor-nav__thumb {
  display: none;
}

.anchor-nav__bar--in-header .anchor-nav__label {
  font-size: 14px;
  white-space: nowrap;
}

.anchor-nav__bar--in-header .anchor-nav__item:hover {
  color: rgb(var(--color-text));
}

.anchor-nav__bar--in-header .anchor-nav__item.is-active {
  color: rgb(var(--color-text));
  border-bottom-color: rgb(var(--color-text));
}

/* 移动端:卡片略缩,横向从左排便于滑动 */
@media screen and (max-width: 959px) {
  .anchor-nav__scroll {
    gap: 18px;
  }

  .anchor-nav__scroll--center {
    justify-content: flex-start;
  }

  .anchor-nav__item {
    width: 78px;
  }

  .anchor-nav__thumb {
    width: 60px;
    height: 60px;
  }

  .anchor-nav__label {
    font-size: 12px;
  }

  .anchor-nav__bar--in-header .anchor-nav__item {
    padding: 12px 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .anchor-nav__bar--in-header {
    animation: none;
  }
  .anchor-nav__thumb {
    transition: none;
  }
}