/* 知识中心 · 技术出版阅读版 */
:root {
  --kc-ink: #16181d;
  --kc-copy: #3b414b;
  --kc-muted: #737b88;
  --kc-line: #e5e8ed;
  --kc-soft: #f6f8fa;
  --kc-blue: #215eea;
  --kc-blue-soft: #edf3ff;
  --kc-font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

#sec-knowledge,
.knowledge-dialog {
  font-family: var(--kc-font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 栏目头部 */
#sec-knowledge .acct-head {
  margin: 0;
  padding: 10px 0 24px;
  border-bottom: 1px solid var(--kc-line);
}
#sec-knowledge .acct-head h1 {
  margin: 0 0 9px;
  color: var(--kc-ink);
  font-family: var(--kc-font);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.035em;
}
#sec-knowledge .acct-head p {
  max-width: 720px;
  margin: 0;
  color: var(--kc-muted);
  font-size: 14px;
  line-height: 1.75;
}
#sec-knowledge > .acct-card {
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

/* 分类与搜索 */
#sec-knowledge .acct-knowledge-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 24px;
  margin: 0;
  padding: 20px 0;
  border-bottom: 1px solid var(--kc-line);
}
#sec-knowledge .acct-knowledge-tabs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}
#sec-knowledge .acct-knowledge-tabs button {
  position: static;
  height: 36px;
  padding: 0 14px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--kc-muted);
  font-family: var(--kc-font);
  font-size: 13px;
  font-weight: 600;
  line-height: 36px;
  cursor: pointer;
  transition: color .16s ease, background-color .16s ease;
}
#sec-knowledge .acct-knowledge-tabs button:hover {
  background: #f2f4f7;
  color: var(--kc-ink);
}
#sec-knowledge .acct-knowledge-tabs button.is-active {
  background: var(--kc-blue-soft);
  color: var(--kc-blue);
}
#sec-knowledge .acct-knowledge-tabs button.is-active::after { content: none; }
#sec-knowledge .acct-knowledge-searchwrap {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
#sec-knowledge #knowledge-count {
  flex: none;
  color: var(--kc-muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
#sec-knowledge #knowledge-search {
  width: 260px;
  height: 38px;
  padding: 0 13px;
  border: 1px solid var(--kc-line);
  border-radius: 8px;
  background: #fff;
  color: var(--kc-ink);
  font-family: var(--kc-font);
  font-size: 13px;
  outline: none;
  transition: border-color .16s ease, box-shadow .16s ease;
}
#sec-knowledge #knowledge-search::placeholder { color: #a1a8b3; }
#sec-knowledge #knowledge-search:focus {
  border-color: #aabbee;
  box-shadow: 0 0 0 3px rgba(33, 94, 234, .09);
}

/* 文章列表 */
#sec-knowledge .acct-knowledge-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 24px 0 0;
}
#sec-knowledge .acct-knowledge-feature {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 0;
  padding: 28px 30px 26px;
  border: 1px solid var(--kc-line);
  border-radius: 12px;
  background: #fff;
  color: var(--kc-copy);
  text-align: left;
  font: inherit;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .025);
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
#sec-knowledge .acct-knowledge-feature:hover {
  border-color: #cbd2dc;
  box-shadow: 0 10px 28px rgba(16, 24, 40, .07);
  transform: translateY(-2px);
}
#sec-knowledge .acct-knowledge-feature:focus-visible,
#sec-knowledge .acct-knowledge-row:focus-visible {
  outline: 2px solid var(--kc-blue);
  outline-offset: 2px;
}
#sec-knowledge .acct-knowledge-overline {
  display: block;
  margin: 0 0 12px;
  color: var(--kc-blue);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: .08em;
}
#sec-knowledge .acct-knowledge-feature h3 {
  max-width: 850px;
  margin: 0 0 10px;
  color: var(--kc-ink);
  font-family: var(--kc-font);
  font-size: 25px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.025em;
  transition: color .16s ease;
}
#sec-knowledge .acct-knowledge-feature:hover h3 { color: var(--kc-blue); }
#sec-knowledge .acct-knowledge-feature p {
  max-width: 850px;
  margin: 0;
  color: #606978;
  font-size: 14px;
  line-height: 1.8;
}
#sec-knowledge .acct-knowledge-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid #f0f2f5;
}
#sec-knowledge .acct-knowledge-foot time {
  color: #8c94a0;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
#sec-knowledge .acct-knowledge-foot em {
  color: var(--kc-blue);
  font-size: 12.5px;
  font-style: normal;
  font-weight: 650;
}
#sec-knowledge .acct-knowledge-rows {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  border: 0;
}
#sec-knowledge .acct-knowledge-row {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 224px;
  padding: 23px 24px 20px;
  border: 1px solid var(--kc-line);
  border-radius: 12px;
  background: #fff;
  color: var(--kc-copy);
  text-align: left;
  font: inherit;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .025);
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
#sec-knowledge .acct-knowledge-row:hover {
  border-color: #cbd2dc;
  box-shadow: 0 10px 26px rgba(16, 24, 40, .065);
  transform: translateY(-2px);
}
#sec-knowledge .acct-knowledge-row__main {
  display: flex;
  flex: 1;
  flex-direction: column;
}
#sec-knowledge .acct-knowledge-row__main > span {
  margin: 0 0 9px;
  color: var(--kc-blue);
  font-size: 11px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: .06em;
}
#sec-knowledge .acct-knowledge-row h3 {
  margin: 0 0 9px;
  color: var(--kc-ink);
  font-family: var(--kc-font);
  font-size: 19px;
  font-weight: 650;
  line-height: 1.5;
  letter-spacing: -0.015em;
  transition: color .16s ease;
}
#sec-knowledge .acct-knowledge-row:hover h3 { color: var(--kc-blue); }
#sec-knowledge .acct-knowledge-row p {
  margin: 0;
  color: #687180;
  font-size: 13.5px;
  line-height: 1.75;
}
#sec-knowledge .acct-knowledge-row__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid #f0f2f5;
}
#sec-knowledge .acct-knowledge-row__meta time {
  color: #8c94a0;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
#sec-knowledge .acct-knowledge-row__meta em {
  color: var(--kc-blue);
  font-size: 15px;
  font-style: normal;
  font-weight: 650;
}

/* 标签弱化，不做药丸堆叠 */
#sec-knowledge .acct-knowledge-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 12px;
  margin: 13px 0 0;
}
#sec-knowledge .acct-knowledge-tags small {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: #8a929e;
  font-size: 11.5px;
  line-height: 1.5;
}
#sec-knowledge .acct-knowledge-empty {
  grid-column: 1 / -1;
  padding: 56px 24px;
  border: 1px dashed #dce1e8;
  border-radius: 12px;
  background: #fafbfc;
  text-align: center;
}
#sec-knowledge .acct-knowledge-empty b {
  color: var(--kc-ink);
  font-size: 15px;
}
#sec-knowledge .acct-knowledge-empty p {
  max-width: 620px;
  margin: 8px auto 0;
  color: var(--kc-muted);
  font-size: 13px;
  line-height: 1.75;
}

/* 文章阅读页 */
.knowledge-dialog {
  position: relative;
  width: min(1120px, 94vw);
  max-width: none;
  max-height: 90vh;
  margin: auto;
  padding: 0;
  overflow-x: hidden;
  overflow-y: auto;
  border: 1px solid #dfe3e9;
  border-radius: 14px;
  background: #fff;
  color: var(--kc-copy);
  box-shadow: 0 32px 90px rgba(15, 23, 42, .22);
}
.knowledge-dialog::backdrop {
  background: rgba(16, 22, 33, .48);
  backdrop-filter: blur(2px);
}
.knowledge-dialog__inner {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 50px 56px 64px;
}
.knowledge-article-head {
  max-width: 952px;
  margin: 0 auto;
}
.knowledge-dialog__cat {
  max-width: none;
  margin: 0 0 12px;
  color: var(--kc-blue);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: .075em;
}
.knowledge-dialog h2 {
  max-width: 930px;
  margin: 0 0 14px;
  color: #111318;
  font-family: var(--kc-font);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.33;
  letter-spacing: -0.035em;
}
.knowledge-dialog__meta {
  max-width: none;
  margin: 0;
  color: #7e8794;
  font-size: 12.5px;
  line-height: 1.75;
  letter-spacing: .01em;
}
.knowledge-dialog__summary {
  max-width: 952px;
  margin: 24px auto 36px;
  padding: 17px 20px;
  border: 1px solid #e8edf5;
  border-radius: 9px;
  background: var(--kc-soft);
  color: #566171;
  font-size: 14px;
  line-height: 1.85;
}
.knowledge-dialog__summary[hidden] { display: none; }
.knowledge-article-layout {
  display: grid;
  grid-template-columns: minmax(0, 720px) 184px;
  align-items: start;
  gap: 48px;
  max-width: 952px;
  margin: 0 auto;
}
.knowledge-dialog__body {
  min-width: 0;
  max-width: 720px;
  margin: 0;
  color: #333333;
  font-family: var(--kc-font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  text-align: left;
  text-justify: none;
  white-space: normal;
  word-break: break-word;
}
.knowledge-dialog__body p {
  margin: 0 0 24px;
  color: #333333;
  font-size: inherit;
  line-height: inherit;
  text-align: left;
}
.knowledge-dialog__body p:last-child { margin-bottom: 0; }
.knowledge-dialog__body h3 {
  margin: 40px 0 16px;
  padding: 0;
  border: 0;
  color: #15171c;
  font-family: var(--kc-font);
  font-size: 20px;
  font-weight: 650;
  line-height: 1.5;
  letter-spacing: -0.012em;
  text-align: left;
  scroll-margin-top: 24px;
}
.knowledge-dialog__body h3:first-child { margin-top: 0; }
.knowledge-dialog__body h3 + p { margin-top: 0; }

/* 随文目录 */
.knowledge-toc {
  position: sticky;
  top: 26px;
  align-self: start;
  padding: 18px 0 16px;
  border-top: 1px solid var(--kc-line);
  border-bottom: 1px solid var(--kc-line);
  font-family: var(--kc-font);
}
.knowledge-toc[hidden] { display: none; }
.knowledge-toc > b {
  display: block;
  margin: 0 0 10px 11px;
  color: #373d46;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.5;
}
.knowledge-toc nav {
  display: grid;
  gap: 2px;
}
.knowledge-toc a {
  display: block;
  padding: 6px 10px;
  border-left: 2px solid transparent;
  color: #7a8390;
  font-size: 12.5px;
  line-height: 1.55;
  text-decoration: none;
  transition: color .16s ease, border-color .16s ease, background-color .16s ease;
}
.knowledge-toc a:hover {
  color: var(--kc-ink);
  background: #f7f8fa;
}
.knowledge-toc a.is-active {
  border-left-color: var(--kc-blue);
  color: var(--kc-blue);
  background: var(--kc-blue-soft);
}

.knowledge-dialog .identity-close {
  position: sticky;
  top: 16px;
  float: right;
  z-index: 3;
  width: 36px;
  height: 36px;
  margin: 16px 16px -52px 0;
  border: 1px solid var(--kc-line);
  border-radius: 50%;
  background: rgba(255, 255, 255, .96);
  color: #626b78;
  font-size: 22px;
  line-height: 32px;
  box-shadow: 0 2px 8px rgba(16, 24, 40, .06);
}
.knowledge-dialog .identity-close:hover {
  border-color: #cbd2dc;
  background: #fff;
  color: var(--kc-ink);
}

@media (max-width: 960px) {
  #sec-knowledge .acct-knowledge-toolbar {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }
  #sec-knowledge .acct-knowledge-searchwrap { width: 100%; }
  #sec-knowledge #knowledge-search { width: 100%; flex: 1; }
  .knowledge-article-layout {
    display: block;
    max-width: 720px;
  }
  .knowledge-toc { display: none; }
}

@media (max-width: 720px) {
  #sec-knowledge .acct-head { padding-bottom: 19px; }
  #sec-knowledge .acct-head h1 { font-size: 27px; }
  #sec-knowledge .acct-head p { font-size: 13px; }
  #sec-knowledge .acct-knowledge-tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }
  #sec-knowledge .acct-knowledge-tabs::-webkit-scrollbar { display: none; }
  #sec-knowledge .acct-knowledge-tabs button { flex: none; }
  #sec-knowledge .acct-knowledge-list,
  #sec-knowledge .acct-knowledge-rows {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }
  #sec-knowledge .acct-knowledge-feature {
    padding: 22px 20px 20px;
  }
  #sec-knowledge .acct-knowledge-feature h3 { font-size: 21px; }
  #sec-knowledge .acct-knowledge-feature p { font-size: 13.5px; }
  #sec-knowledge .acct-knowledge-row {
    min-height: 0;
    padding: 20px;
  }
  #sec-knowledge .acct-knowledge-row h3 { font-size: 18px; }

  .knowledge-dialog {
    width: 100vw;
    height: 100dvh;
    max-height: 100dvh;
    margin: 0;
    border: 0;
    border-radius: 0;
  }
  .knowledge-dialog__inner { padding: 30px 18px 46px; }
  .knowledge-dialog .identity-close {
    top: 10px;
    margin: 10px 10px -46px 0;
  }
  .knowledge-dialog__cat { margin-bottom: 10px; font-size: 11.5px; }
  .knowledge-dialog h2 {
    margin-bottom: 12px;
    font-size: 27px;
    line-height: 1.4;
  }
  .knowledge-dialog__meta { font-size: 12px; }
  .knowledge-dialog__summary {
    margin: 20px 0 30px;
    padding: 14px 15px;
    font-size: 13.5px;
    line-height: 1.8;
  }
  .knowledge-dialog__body {
    font-size: 16px;
    line-height: 1.9;
  }
  .knowledge-dialog__body p { margin-bottom: 23px; }
  .knowledge-dialog__body h3 {
    margin: 35px 0 14px;
    font-size: 19px;
  }
}

@media (max-width: 390px) {
  .knowledge-dialog__inner { padding-left: 16px; padding-right: 16px; }
  .knowledge-dialog h2 { font-size: 25px; }
  #sec-knowledge .acct-knowledge-searchwrap { align-items: stretch; flex-direction: column; gap: 7px; }
  #sec-knowledge #knowledge-count { padding-left: 1px; }
}

@media (prefers-reduced-motion: reduce) {
  #sec-knowledge .acct-knowledge-feature,
  #sec-knowledge .acct-knowledge-row,
  #sec-knowledge .acct-knowledge-tabs button,
  .knowledge-toc a {
    transition: none;
  }
}