/* ============================================================
   related.css - 相关内容组件
   
   用途: 文章/FAQ底部的相关推荐、权重回传链接
   依赖: core/tokens.css
   ============================================================ */

/* ============================================================
   Related - 相关内容
   ============================================================ */
.pb-related {
  padding-top: var(--space-6);
  border-top: var(--space-px) solid var(--color-border);
}

/* 当 .pb-related 在内容区块内部时（旧结构兼容） */
.pd-faq-detail .pb-related,
.pd-article .pb-related {
  margin-top: var(--space-8);
}

/* FAQ详情页内的 pb-related 特殊处理：卡片自适应 */
.pd-faq-detail__card > .pb-related {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
}

.pd-faq-detail__card > .pb-related .pb-related__grid {
  grid-template-columns: 1fr;
}

.pd-faq-detail__card > .pb-related .pb-related__item a {
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}

.pd-faq-detail__card > .pb-related .pb-related__name {
  white-space: normal;
  overflow: visible;
  text-overflow: clip;
  line-height: var(--line-height-normal);
}

@media (min-width: 768px) {
  .pd-faq-detail__card > .pb-related .pb-related__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .pd-faq-detail__card > .pb-related .pb-related__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 当 .pb-related 是 .pd-layout__main 的直接子元素时（新结构，flex 下沉） */
.pd-layout__main > .pb-related {
  margin-top: auto;
  padding-top: var(--space-8);
}

.pb-related__title {
  margin: 0 0 var(--space-5);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.pb-related__grid {
  display: grid;
  gap: var(--space-4);
}

.pb-related__item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4);
  background-color: var(--color-bg-secondary);
  border: var(--space-px) solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: border-color var(--duration-150) var(--easing-in-out),
              background-color var(--duration-150) var(--easing-in-out);
}

.pb-related__item a:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-lighter);
}

.pb-related__name {
  margin: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.pb-related__date {
  flex-shrink: 0;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   Backlink - 权重回传
   ============================================================ */
.pb-backlink {
  margin-top: var(--space-6);
  padding: var(--space-5);
  background-color: var(--color-bg);
  border: var(--space-px) solid var(--color-border);
  border-radius: var(--radius-xl);
}

.pb-backlink__text {
  margin: 0 0 var(--space-3);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.pb-backlink__text a {
  color: var(--color-primary);
  text-decoration: none;
}

.pb-backlink__text a:hover {
  text-decoration: underline;
}

.pb-backlink__parent {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  text-decoration: none;
}

.pb-backlink__parent:hover {
  text-decoration: underline;
}

.pb-backlink__siblings {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding-top: var(--space-4);
  border-top: var(--space-px) solid var(--color-border);
}

.pb-backlink__link {
  padding: var(--space-1-5) var(--space-3);
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-tertiary);
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background-color var(--duration-150) var(--easing-in-out),
              color var(--duration-150) var(--easing-in-out);
}

.pb-backlink__link:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.pb-backlink__link.is-current {
  color: var(--color-text-inverse);
  background-color: var(--color-primary);
}

/* ============================================================
   Responsive - 768px+
   ============================================================ */
@media (min-width: 768px) {
  .pb-related__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   Responsive - 1024px+
   ============================================================ */
@media (min-width: 1024px) {
  .pb-related__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}