/* ============================================================
   kb.css —— 知识库「镁相关」栏目样式
   依赖 tokens.css；仅使用语义变量，不引入裸 HEX（品牌色除外）
   ============================================================ */

.kb-wrap { max-width: 1080px; }

/* ---------- 头部 ---------- */
.kb-hero { padding-bottom: var(--space-4, 16px); }
.kb-kicker {
  display: inline-block; margin: 12px 0 6px; padding: 3px 10px;
  font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--color-primary); background: var(--color-brand-50);
  border: 1px solid var(--color-brand-200); border-radius: 999px;
}
.kb-hero h1 {
  margin: 6px 0 10px; font-size: clamp(24px, 3.6vw, 34px); line-height: 1.3;
  color: var(--color-text-title);
}
.kb-lead { color: var(--color-text-secondary); font-size: 16px; line-height: 1.8; margin: 0 0 14px; }
.kb-stats { display: flex; flex-wrap: wrap; gap: 18px; color: var(--color-text-tertiary); font-size: 14px; }
.kb-stats b { color: var(--color-primary); font-size: 18px; margin-right: 4px; }

/* ---------- 标签筛选 ---------- */
.kb-filters { border-bottom: 1px solid var(--color-border); padding-bottom: var(--space-5, 20px); }
.kb-filter-row { display: flex; gap: 16px; align-items: flex-start; padding: 10px 0; }
.kb-filter-title {
  flex: 0 0 96px; margin: 4px 0 0; font-size: 14px; font-weight: 600;
  color: var(--color-text-secondary);
}
.kb-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.kb-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; font-size: 13px; line-height: 1.4;
  color: var(--color-text-body); background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: 999px;
  text-decoration: none; transition: all .15s ease;
}
.kb-chip:hover {
  color: var(--color-primary); border-color: var(--color-brand-300);
  background: var(--color-brand-50); text-decoration: none;
}
.kb-chip-n {
  font-size: 11px; padding: 0 5px; border-radius: 999px;
  background: var(--color-surface-alt); color: var(--color-text-tertiary);
}
.kb-chip-sm { padding: 2px 8px; font-size: 12px; }

/* ---------- 区块标题 ---------- */
.kb-section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin: 8px 0 16px;
}
.kb-section-head h2 { margin: 0; font-size: 20px; color: var(--color-text-title); }
.kb-section-head span { font-size: 13px; color: var(--color-text-tertiary); }

/* ---------- 文章卡片 ---------- */
.kb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.kb-card {
  display: flex; flex-direction: column; gap: 8px;
  padding: 18px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: 12px;
  text-decoration: none; transition: border-color .15s ease, box-shadow .15s ease, transform .15s ease;
}
.kb-card:hover {
  border-color: var(--color-brand-300); box-shadow: 0 6px 20px rgba(23,84,80,.08);
  transform: translateY(-2px); text-decoration: none;
}
.kb-card-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.kb-card h3 {
  margin: 0; font-size: 17px; line-height: 1.5; color: var(--color-text-title);
}
.kb-card p {
  margin: 0; font-size: 14px; line-height: 1.7; color: var(--color-text-secondary);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.kb-card-foot {
  margin-top: auto; padding-top: 6px; display: flex; justify-content: space-between;
  font-size: 12px; color: var(--color-text-tertiary);
}
.kb-read { color: var(--color-link); }
.kb-empty {
  padding: 32px; text-align: center; color: var(--color-text-tertiary);
  background: var(--color-bg-alt); border: 1px dashed var(--color-border); border-radius: 12px;
}

/* ---------- 文章详情 ---------- */
.kb-article { margin-top: 8px; }
.kb-article-head { padding-bottom: 18px; border-bottom: 1px solid var(--color-border); }
.kb-article-head h1 {
  margin: 0 0 10px; font-size: clamp(22px, 3.2vw, 30px); line-height: 1.4;
  color: var(--color-text-title);
}
.kb-meta {
  display: flex; flex-wrap: wrap; gap: 14px; font-size: 13px;
  color: var(--color-text-tertiary); margin-bottom: 12px;
}
.kb-body { margin-top: 20px; }
.kb-body h2 {
  margin: 28px 0 10px; padding-left: 10px; font-size: 19px;
  border-left: 3px solid var(--color-primary); color: var(--color-text-title);
}
.kb-body h3 { margin: 20px 0 8px; font-size: 16px; color: var(--color-text-title); }
.kb-body p, .kb-body li { font-size: 15.5px; line-height: 1.9; color: var(--color-text-body); }
.kb-body ul, .kb-body ol { padding-left: 22px; }
.kb-body a { color: var(--color-link); text-decoration: underline; text-underline-offset: 2px; }
.kb-body table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.kb-body th, .kb-body td { border: 1px solid var(--color-border); padding: 8px 10px; text-align: left; }
.kb-body th { background: var(--color-bg-alt); }

.kb-article-foot { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--color-border); }
.kb-tags-box { display: flex; gap: 12px; align-items: flex-start; }
.kb-label {
  flex: 0 0 auto; font-size: 12px; padding: 4px 9px; border-radius: 4px;
  color: var(--color-text-secondary); background: var(--color-surface-alt);
}
.kb-cta {
  margin-top: 20px; padding: 18px 20px; border-radius: 12px;
  background: var(--color-brand-50); border: 1px solid var(--color-brand-200);
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.kb-cta div { display: flex; flex-direction: column; gap: 4px; }
.kb-cta strong { color: var(--color-text-title); font-size: 15px; }
.kb-cta span { color: var(--color-text-secondary); font-size: 13px; }

/* ---------- 相关 / 分页 ---------- */
.kb-related { margin-top: 36px; }
.kb-related h2 { font-size: 18px; margin: 0 0 14px; color: var(--color-text-title); }
.kb-siblings { margin-top: 32px; }
.kb-siblings h2 { font-size: 16px; margin: 0 0 12px; color: var(--color-text-title); }
.kb-backlink { margin-top: 28px; font-size: 14px; }
.kb-backlink a { color: var(--color-link); }

.kb-pager { display: flex; gap: 8px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.kb-pager a, .kb-pager span {
  min-width: 36px; padding: 7px 12px; text-align: center; font-size: 14px;
  border: 1px solid var(--color-border); border-radius: 8px;
  color: var(--color-text-body); text-decoration: none;
}
.kb-pager a:hover { border-color: var(--color-brand-300); color: var(--color-primary); }
.kb-pager .is-cur {
  background: var(--color-primary); border-color: var(--color-primary);
  color: var(--color-text-on-brand);
}

/* ---------- 标签聚合页头部 ---------- */
.kb-tag-head { padding: 8px 0 20px; border-bottom: 1px solid var(--color-border); margin-bottom: 20px; }
.kb-tag-head h1 { margin: 8px 0 10px; font-size: clamp(22px, 3.2vw, 30px); color: var(--color-text-title); }

/* ---------- 首页「镁相关」入口区块（由 /wiki/index.html 使用） ---------- */
.kb-entry-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

@media (max-width: 720px) {
  .kb-filter-row { flex-direction: column; gap: 8px; }
  .kb-filter-title { flex: none; }
  .kb-grid { grid-template-columns: 1fr; }
  .kb-cta { flex-direction: column; align-items: flex-start; }
}

/* ---------- 入口卡片（a.card 需块级化，否则行内元素边框会沿文字碎裂） ---------- */
a.card{display:block;color:inherit;text-decoration:none;}
a.card .card-link{display:inline-block;margin-top:2px;}