/* Desktop three-level directory for standard topic pages. */
.net-desktop-toc {
  display: none;
}

@media (max-width: 1199px) {
  body.net-two-level-topic .topic-grid,
  body.net-two-level-topic .card-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 24px;
  }

  body.net-two-level-topic .topic-card {
    display: flex;
    width: 100%;
    min-width: 0;
    min-height: 142px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 17px;
    border: 1px solid #eadfd3;
    border-radius: 12px;
    background: #fff;
    color: #2d2d2d;
    font: inherit;
    text-align: left;
    text-decoration: none;
  }

  body.net-two-level-topic .topic-card .tc-icon { font-size: 25px; line-height: 1; }
  body.net-two-level-topic .topic-card .tc-tag,
  body.net-two-level-topic .topic-card .tc-l1-tag {
    padding: 3px 9px;
    border: 1px solid #d8b895;
    border-radius: 999px;
    background: #f1dfc9;
    color: #513321;
    font-size: 11px;
    font-weight: 700;
    line-height: 1.45;
  }
  body.net-two-level-topic .topic-card .tc-title { color: #39271d; font-size: 16px; font-weight: 700; line-height: 1.45; }
  body.net-two-level-topic .topic-card .tc-desc { color: #715d50; font-size: 13px; line-height: 1.65; }
  body.net-two-level-topic #viewDetail .detail-header { display: flex; align-items: flex-start; gap: 10px; margin-bottom: 16px; }
  body.net-two-level-topic #viewDetail .back-btn {
    flex: none;
    min-height: 42px;
    padding: 8px 12px;
    border: 1px solid #d8b995;
    border-radius: 9px;
    background: #fff9ef;
    color: #674a37;
    font: inherit;
    font-size: 13px;
  }
  body.net-two-level-topic #viewDetail #detailTitle { color: #39271d; font-size: 17px; font-weight: 700; line-height: 1.45; }
}

@media (max-width: 600px) {
  body.net-two-level-topic .topic-grid,
  body.net-two-level-topic .card-grid { grid-template-columns: 1fr; }
  body.net-two-level-topic .topic-card { min-height: 0; }
}

@media (min-width: 1200px) {
  body.net-two-level-topic .container { max-width: 1040px; }
  body.net-two-level-topic #viewDetail { max-width: 680px; margin-left: auto; margin-right: auto; }

  body.net-two-level-topic .topic-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 24px;
  }

  body.net-two-level-topic .topic-card {
    display: flex;
    min-width: 0;
    min-height: 160px;
    flex-direction: column;
    align-items: flex-start;
    gap: 7px;
    padding: 18px;
    border: 1px solid #eadfd3;
    border-radius: 13px;
    background: #fff;
    color: #2d2d2d;
    font: inherit;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
  }

  body.net-two-level-topic .topic-card:hover {
    border-color: #c79c73;
    box-shadow: 0 5px 18px rgba(76, 52, 35, .08);
    transform: translateY(-1px);
  }

  body.net-two-level-topic .topic-card .tc-icon { font-size: 25px; line-height: 1; }
  body.net-two-level-topic .topic-card .tc-tag,
  body.net-two-level-topic .topic-card .tc-l1-tag {
    padding: 3px 9px;
    border: 1px solid #d8b895;
    border-radius: 999px;
    background: #f1dfc9;
    color: #513321;
    font-size: 11px;
    font-weight: 700;
    line-height: 1.45;
  }
  body.net-two-level-topic .topic-card .tc-title { color: #39271d; font-size: 16px; font-weight: 700; line-height: 1.45; }
  body.net-two-level-topic .topic-card .tc-desc { color: #715d50; font-size: 13px; line-height: 1.65; }
  body.net-two-level-topic #viewDetail .detail-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
  }
  body.net-two-level-topic #viewDetail .back-btn {
    flex: none;
    padding: 8px 14px;
    border: 1px solid #d8b995;
    border-radius: 9px;
    background: #fff9ef;
    color: #674a37;
    font: inherit;
    font-size: 13px;
    cursor: pointer;
  }
  body.net-two-level-topic #viewDetail #detailTitle { color: #39271d; font-size: 18px; font-weight: 700; }

  .net-desktop-toc {
    display: block;
    position: fixed;
    z-index: 20;
    top: 92px;
    left: max(16px, calc((100vw - 1040px) / 2 - 200px));
    width: 176px;
    max-height: calc(100vh - 112px);
    overflow-y: auto;
    padding: 12px 10px 14px;
    background: #FFF9EF;
    border: 1px solid #E7D2B8;
    border-radius: 12px;
    box-shadow: 0 3px 14px rgba(76, 52, 35, .06);
    scrollbar-width: thin;
    scrollbar-color: #D4AF83 transparent;
  }

  .net-desktop-toc::-webkit-scrollbar { width: 5px; }
  .net-desktop-toc::-webkit-scrollbar-thumb { background: #D4AF83; border-radius: 999px; }

  .net-desktop-toc + .container {
    /* 宽屏时内容保持居中，目录位于内容区左侧，不占用内容层。 */
    margin-left: auto;
    margin-right: auto;
  }
}

.net-desktop-toc-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
  padding: 5px 8px;
  border-left: 3px solid #B7791F;
  color: #513525;
}

.net-desktop-toc-title strong { font-size: 15px; line-height: 1.4; }
.net-desktop-toc-title span { font-size: 11px; color: #86664F; }

.net-desktop-toc-global {
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px dashed #DFC4A5;
}

.net-desktop-toc-global summary {
  display: flex;
  align-items: center;
  gap: 7px;
  cursor: pointer;
  list-style: none;
  padding: 5px 7px;
  border-radius: 6px;
  color: #513525;
  font-size: 12px;
  font-weight: 700;
}

.net-desktop-toc-global summary::-webkit-details-marker { display: none; }
.net-desktop-toc-global summary::before {
  content: "›";
  color: #B7791F;
  font-size: 16px;
  line-height: 1;
  transition: transform .15s;
}
.net-desktop-toc-global[open] summary::before { transform: rotate(90deg); }
.net-desktop-toc-global summary:focus-visible,
.net-desktop-toc-link:focus-visible,
.net-desktop-toc-local-link:focus-visible,
.net-desktop-toc-sub-link:focus-visible {
  outline: 2px solid #B7793F;
  outline-offset: 1px;
}

.net-desktop-toc-level { font-size: 10px; color: #86664F; font-weight: 500; }
.net-desktop-toc-global-nav { margin-top: 4px; padding-left: 4px; }
.net-desktop-toc-link,
.net-desktop-toc-local-link,
.net-desktop-toc-sub-link {
  display: block;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  color: #674A37;
  text-decoration: none;
  font-size: 11px;
  line-height: 1.4;
  padding: 4px 5px 4px 9px;
  transition: background-color .15s, color .15s, border-color .15s;
}
.net-desktop-toc-link:hover,
.net-desktop-toc-local-link:hover,
.net-desktop-toc-sub-link:hover { background: #F2E0CB; color: #4A2E1E; }
.net-desktop-toc-global-subnav {
  margin: 0 0 3px 10px;
  padding: 0;
  border-left: 1px dashed #DFC4A5;
  list-style: none;
}
.net-desktop-toc-global-subnav .net-desktop-toc-link { font-size: 10.5px; padding-left: 8px; }
.net-desktop-toc-level-heading {
  margin: 0 8px 3px;
  color: #86664F;
  font-size: 10px;
  line-height: 1.4;
  letter-spacing: .04em;
}
.net-desktop-toc-local-nav { margin: 0; padding: 0; list-style: none; }
.net-desktop-toc-local-link.is-active {
  background: #EBCFAB;
  border-left-color: #A96B32;
  color: #512D17;
  font-weight: 700;
}
.net-desktop-toc-subtitle {
  margin: 13px 8px 3px;
  padding-top: 9px;
  border-top: 1px dashed #DFC4A5;
  color: #86664F;
  font-size: 10px;
  line-height: 1.4;
}
.net-desktop-toc-subnav { margin-left: 7px; border-left: 1px dashed #DFC4A5; }
.net-desktop-toc-sub-link { font-size: 11px; padding: 4px 5px 4px 9px; color: #674A37; }

/* AI 双侧目录试点：仅对显式标记的页面生效。 */
.net-desktop-toc-right-panel { display: block; }
.net-double-toc-pilot .net-desktop-toc-global summary[hidden] { display: none; }
.net-double-toc-pilot .net-desktop-toc-global summary { cursor: default; }
.net-double-toc-pilot .net-desktop-toc-global summary::before { display: none; }
.net-desktop-toc-right-title { display: flex; align-items: baseline; gap: 8px; margin-bottom: 10px; padding: 5px 8px; border-left: 3px solid #B7791F; color: #513525; }
.net-desktop-toc-right-title strong { font-size: 15px; line-height: 1.4; white-space: nowrap; }
.net-desktop-toc-right-title span { font-size: 10px; color: #A0725A; white-space: nowrap; }

@media (max-width: 1439px) and (min-width: 1200px) {
  .net-desktop-toc + .container { margin-left: 200px; margin-right: 24px; }
}

/* 双侧目录从桌面起始宽度即分列显示；正文随可用空间收窄，避免左右栏遮挡。 */
@media (min-width: 1200px) {
  body.net-double-toc-pilot .net-desktop-toc-left { left: max(8px, calc((100vw - 1040px) / 2 - 200px)); }
  body.net-double-toc-pilot .net-desktop-toc + .container {
    max-width: min(1040px, calc(100vw - 400px));
    margin-left: auto;
    margin-right: auto;
  }
  body.net-double-toc-pilot .net-desktop-toc-right-panel {
    position: fixed;
    z-index: 20;
    top: 92px;
    right: max(8px, calc((100vw - 1040px) / 2 - 200px));
    width: 176px;
    max-height: calc(100vh - 112px);
    overflow-y: auto;
    padding: 12px 10px 14px;
    background: #F8EADC;
    border: 1px solid #DFC4A5;
    border-radius: 12px;
    box-shadow: 0 3px 14px rgba(76, 52, 35, .06);
    scrollbar-width: thin;
    scrollbar-color: #D4AF83 transparent;
  }
  body.net-double-toc-pilot .net-desktop-toc-right-panel::-webkit-scrollbar { width: 5px; }
  body.net-double-toc-pilot .net-desktop-toc-right-panel::-webkit-scrollbar-thumb { background: #D4AF83; border-radius: 999px; }
}

.net-desktop-toc + .container #detailContent .sub-head,
.net-desktop-toc + .container #detailContent .figure-head,
.net-desktop-toc + .container #detailContent .section-body h3,
.net-desktop-toc + .container #detailContent .section-body h4 {
  scroll-margin-top: 96px;
}