/* ============================================================================
   knowledge.css · 技术文库（2026-10-23 新建）
   ----------------------------------------------------------------------------
   与旧新闻页（news-v3-page.css）完全隔离，所有类名 kn- 前缀。
   设计目标：① 人能读 ② AI 能抓（语义化 + 摘要块 + 表格友好 + 内链）
   回滚：删两个页面对本文件的 $extraCss 引用即可。
   ========================================================================== */

/* ---------- 列表页 ---------- */
.kn-page { --kn-line: var(--line-l, rgba(58,48,26,.14)); }

.kn-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; flex-wrap: wrap; margin-bottom: 34px;
}
.kn-cats { display: flex; flex-wrap: wrap; gap: 6px; }
.kn-cat {
  padding: 8px 15px; border: 1px solid var(--kn-line); border-radius: 3px;
  font-size: 13px; color: var(--tx-l-2, #5C5445); text-decoration: none;
  transition: .2s var(--ease, ease); white-space: nowrap;
}
.kn-cat em {
  font-style: normal; font-family: var(--mono, monospace); font-size: 10.5px;
  opacity: .55; margin-left: 5px;
}
.kn-cat:hover { border-color: var(--accent, #C9AF6C); color: var(--accent-deep, #8A7440); }
.kn-cat.is-on {
  border-color: var(--accent-deep, #8A7440); background: rgba(201,175,108,.12);
  color: var(--accent-deep, #8A7440); font-weight: 600;
}
.kn-total {
  font-family: var(--mono, monospace); font-size: 11.5px;
  letter-spacing: .06em; color: var(--tx-l-3, #8A8375);
}

.kn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }

.kn-card {
  display: flex; flex-direction: column; gap: 12px;
  padding: 26px 26px 22px; border: 1px solid var(--kn-line); border-radius: 6px;
  background: #FDFBF6; text-decoration: none; color: inherit;
  transition: .24s var(--ease, ease);
}
.kn-card:hover {
  border-color: rgba(201,175,108,.55); transform: translateY(-2px);
  box-shadow: 0 12px 30px -18px rgba(58,48,26,.5);
}
.kn-card-top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.kn-card-tag {
  font-family: var(--mono, monospace); font-size: 10px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent-deep, #8A7440);
  border: 1px solid rgba(138,116,64,.3); border-radius: 2px; padding: 3px 8px;
}
.kn-card-read {
  font-family: var(--mono, monospace); font-size: 10.5px; color: var(--tx-l-3, #8A8375);
}
.kn-card h2, .kn-card h3 {
  margin: 0; font-size: 19px; line-height: 1.45; font-weight: 600;
  color: var(--tx-l, #1B1810); letter-spacing: -.005em;
}
.kn-card:hover h2, .kn-card:hover h3 { color: var(--accent-deep, #8A7440); }
.kn-card p {
  margin: 0; font-size: 13.5px; line-height: 1.75; color: var(--tx-l-2, #5C5445);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.kn-card-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  margin-top: auto; padding-top: 14px; border-top: 1px solid var(--kn-line);
}
.kn-card-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.kn-chip {
  font-family: var(--mono, monospace); font-size: 10.5px; color: var(--tx-l-3, #8A8375);
  background: rgba(58,48,26,.05); border-radius: 2px; padding: 2px 7px;
}
.kn-card-date {
  font-family: var(--mono, monospace); font-size: 11px; color: var(--tx-l-3, #8A8375);
}

.kn-empty {
  padding: 60px 0; text-align: center; color: var(--tx-l-3, #8A8375); font-size: 14px;
}
.kn-empty a { color: var(--accent-deep, #8A7440); }

/* ---------- 列表分页（2026-10-25）----------
   一页 8 篇。分页条与 .kn-cat 同一套语汇（1px 细边框 + 3px 圆角 + 金色高亮），
   不引入新色号、不新增加重。翻页锚点 #kn-list 的偏移由 scroll-margin-top 处理，
   避免标题被吸顶导航压住。 */
#kn-list { scroll-margin-top: calc(var(--nav-h, 72px) + 16px); }

.kn-pager {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  flex-wrap: wrap; margin-top: 44px; padding-top: 30px;
  border-top: 1px solid var(--kn-line);
}
.kn-pg-arrow,
.kn-pg-num {
  display: inline-flex; align-items: center; justify-content: center;
  height: 40px; border: 1px solid var(--kn-line); border-radius: 3px;
  text-decoration: none; transition: .2s var(--ease, ease);
}
.kn-pg-arrow {
  padding: 0 16px; font-size: 13px; color: var(--tx-l-2, #5C5445);
}
.kn-pg-arrow:hover { border-color: var(--accent, #C9AF6C); color: var(--accent-deep, #8A7440); }
/* 置灰态保留边框（否则「下一页」会缩成没有块形的三个字，视觉重心向左塌），
   只降文字色 —— 不用 opacity，避免和淡边框叠加成 2:1 的死灰。 */
.kn-pg-arrow.is-off {
  color: #A79D8A; cursor: not-allowed;
}
.kn-pg-arrow.is-off:hover { border-color: var(--kn-line); color: #A79D8A; }

.kn-pg-nums { display: inline-flex; align-items: center; gap: 4px; }
.kn-pg-num {
  min-width: 40px; padding: 0 9px; border-color: var(--kn-line);
  font-family: var(--mono, monospace); font-size: 12.5px;
  color: var(--tx-l-2, #5C5445);
}
.kn-pg-num:hover { border-color: var(--accent, #C9AF6C); color: var(--accent-deep, #8A7440); }
.kn-pg-num.is-on {
  border-color: rgba(138,116,64,.55); background: rgba(201,175,108,.22);
  color: var(--accent-deep, #8A7440); font-weight: 700;
}
.kn-pg-gap {
  padding: 0 3px; font-family: var(--mono, monospace);
  font-size: 12px; color: var(--tx-l-3, #8A8375);
}
/* 紧凑版只在窄屏出现（见下方媒体查询） */
.kn-pg-compact { display: none; }

/* ---------- 详情页 ---------- */
.kn-art { --kn-line: var(--line-l, rgba(58,48,26,.14)); }

.kn-meta {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-family: var(--mono, monospace); font-size: 11px;
  letter-spacing: .06em; color: var(--tx-d-3, #7C828B);
}
.kn-meta .kn-mtag {
  color: var(--accent, #C9AF6C); border: 1px solid rgba(201,175,108,.4);
  border-radius: 2px; padding: 3px 9px;
}

.kn-lede {
  margin: 26px 0 0; padding: 18px 22px; border-left: 2px solid var(--accent, #C9AF6C);
  background: rgba(201,175,108,.07); border-radius: 0 4px 4px 0;
  font-size: 15px; line-height: 1.85; color: var(--tx-d-2, #C9CBD1);
}

.kn-wrap {
  display: grid; grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px; align-items: start;
}
/* grid 子项默认 min-width:auto，遇到宽表格会把整列撑破 → 必须显式归零 */
.kn-wrap > * { min-width: 0; }
.kn-body { min-width: 0; max-width: 100%; overflow-wrap: break-word; }

/* 正文排版 */
.kn-body { font-size: 15.5px; line-height: 1.95; color: var(--tx-l, #1B1810); }
.kn-body > *:first-child { margin-top: 0; }
.kn-body h2 {
  margin: 46px 0 16px; padding-top: 22px; border-top: 1px solid var(--kn-line);
  font-size: 22px; line-height: 1.4; font-weight: 600; letter-spacing: -.01em;
}
.kn-body h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 34px; }
.kn-body h3 { margin: 30px 0 10px; font-size: 17px; font-weight: 600; }
.kn-body p { margin: 0 0 18px; }
.kn-body ul, .kn-body ol { margin: 0 0 20px; padding-left: 22px; }
.kn-body li { margin-bottom: 9px; }
.kn-body strong { font-weight: 600; color: var(--ink, #0B0D10); }
.kn-body a { color: var(--accent-deep, #8A7440); text-decoration: underline; text-underline-offset: 3px; }
.kn-body blockquote {
  margin: 24px 0; padding: 14px 20px; border-left: 2px solid rgba(201,175,108,.6);
  background: rgba(201,175,108,.06); color: var(--tx-l-2, #5C5445);
  font-size: 14.5px; line-height: 1.85;
}
.kn-body blockquote p:last-child { margin-bottom: 0; }

/* 表格：AI 最喜欢摘录的结构 */
.kn-body table {
  width: 100%; border-collapse: collapse; margin: 24px 0 26px;
  font-size: 13px; line-height: 1.6;
}
.kn-body thead th {
  background: rgba(58,48,26,.055); text-align: left; font-weight: 600;
  color: var(--tx-l, #1B1810); padding: 11px 12px; border-bottom: 1px solid var(--kn-line);
  white-space: nowrap;
}
.kn-body tbody td {
  padding: 11px 12px; border-bottom: 1px solid var(--kn-line);
  color: var(--tx-l-2, #5C5445); vertical-align: top;
}
.kn-body tbody tr:last-child td { border-bottom: 0; }
.kn-body tbody td:first-child { color: var(--tx-l, #1B1810); font-weight: 500; }

/* 目录 */
.kn-toc {
  position: sticky; top: 96px;
  border: 1px solid var(--kn-line); border-radius: 6px; padding: 18px 18px 14px;
  background: #FDFBF6;
}
.kn-toc h4 {
  margin: 0 0 12px; font-family: var(--mono, monospace); font-size: 10px;
  letter-spacing: .16em; text-transform: uppercase; color: var(--tx-l-3, #8A8375);
  font-weight: 500;
}
.kn-toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.kn-toc li { counter-increment: toc; margin-bottom: 2px; }
.kn-toc a {
  display: block; padding: 6px 0 6px 22px; position: relative;
  font-size: 13px; line-height: 1.5; color: var(--tx-l-2, #5C5445);
  text-decoration: none; transition: color .2s;
}
.kn-toc a::before {
  content: counter(toc, decimal-leading-zero); position: absolute; left: 0;
  font-family: var(--mono, monospace); font-size: 10px; color: var(--accent, #C9AF6C);
  top: 8px;
}
.kn-toc a:hover, .kn-toc a.is-on { color: var(--accent-deep, #8A7440); }

.kn-side-block { margin-top: 22px; }
.kn-side-block h4 {
  margin: 0 0 10px; font-family: var(--mono, monospace); font-size: 10px;
  letter-spacing: .16em; text-transform: uppercase; color: var(--tx-l-3, #8A8375);
  font-weight: 500;
}
.kn-side-prod {
  display: block; padding: 12px 14px; border: 1px solid var(--kn-line);
  border-radius: 4px; text-decoration: none; margin-bottom: 8px;
  transition: .2s var(--ease, ease);
}
.kn-side-prod:hover { border-color: rgba(201,175,108,.55); background: rgba(201,175,108,.06); }
.kn-side-prod b {
  display: block; font-family: var(--mono, monospace); font-size: 12.5px;
  color: var(--tx-l, #1B1810); margin-bottom: 3px;
}
.kn-side-prod span { font-size: 12px; color: var(--tx-l-3, #8A8375); }

/* 文末 */
.kn-foot {
  margin-top: 56px; padding-top: 26px; border-top: 1px solid var(--kn-line);
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap;
}
.kn-copy { font-size: 12px; line-height: 1.7; color: var(--tx-l-3, #8A8375); max-width: 60ch; }
.kn-cta { display: flex; gap: 10px; flex-wrap: wrap; }

/* 相关文章 */
.kn-related { margin-top: 64px; }
.kn-related h3 {
  margin: 0 0 20px; font-family: var(--mono, monospace); font-size: 11px;
  letter-spacing: .16em; text-transform: uppercase; color: var(--tx-l-3, #8A8375);
  font-weight: 500;
}
.kn-related .kn-grid { grid-template-columns: 1fr 1fr; gap: 16px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .kn-wrap { grid-template-columns: 1fr; gap: 0; }
  .kn-toc, .kn-side { display: none; }
}
@media (max-width: 820px) {
  .kn-grid { grid-template-columns: 1fr; gap: 16px; }
  .kn-card { padding: 22px 20px 18px; }
  .kn-card h2, .kn-card h3 { font-size: 17.5px; }
  .kn-body { font-size: 15px; line-height: 1.9; }
  .kn-body h2 { font-size: 19px; margin-top: 36px; }
  .kn-body table { font-size: 12px; display: block; overflow-x: auto; white-space: nowrap; max-width: 100%; }
  .kn-body thead th, .kn-body tbody td { white-space: nowrap; }
  .kn-related .kn-grid { grid-template-columns: 1fr; }
  .kn-lede { font-size: 14.5px; padding: 16px 18px; }
  /* 分页：触摸目标提到 44px（移动端可用性下限），数字区最多显示 5 项 */
  .kn-pager { margin-top: 32px; padding-top: 24px; gap: 6px; }
  .kn-pg-arrow { height: 44px; padding: 0 12px; font-size: 12.5px; }
  .kn-pg-num { min-width: 44px; height: 44px; padding: 0 6px; font-size: 13px; }
}

/* 窄屏（≤560）：页码换成「当前 / 总数」，箭头只留符号。
   7 页时「‹ 1 2 3 4 5 6 7 ›」九个元素的触摸目标在 350px 可用宽度里装不下，
   硬塞只会换行成两行；文字交给 aria-label，读屏信息不丢。 */
@media (max-width: 560px) {
  .kn-pg-txt { display: none; }
  .kn-pg-nums { display: none; }
  .kn-pg-arrow { width: 44px; padding: 0; font-size: 15px; }
  .kn-pager { gap: 4px; }
  .kn-pg-compact {
    display: inline-flex; align-items: baseline; gap: 2px;
    height: 44px; padding: 0 10px;
    font-family: var(--mono, monospace); font-size: 13px;
    color: var(--tx-l-3, #8A8375);
    border: 1px solid var(--kn-line); border-radius: 3px;
  }
  .kn-pg-compact b { color: var(--accent-deep, #8A7440); font-weight: 700; font-size: 14px; }
  .kn-pg-compact i { font-style: normal; }
}

/* ---------- 正文配图（2026-10-23）----------
   文章里插图用 <figure>，图注用 <figcaption>：
   ① 图片不裁切、等比缩放；② 图注小字灰，和正文区分；③ 手机端不撑破容器 */
.kn-body figure {
  margin: 28px 0 30px;
  padding: 0;
}
.kn-body figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 5px;
  border: 1px solid var(--kn-line);
  background: #0B0D10;
}
.kn-body figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--tx-l-3, #8A8375);
  text-align: left;
}
.kn-body figcaption b { color: var(--tx-l-2, #5C5445); font-weight: 600; }
@media (max-width: 820px) {
  .kn-body figure { margin: 22px 0 24px; }
  .kn-body figcaption { font-size: 12px; }
}