/* Mobile three-level directory for .net topic pages. */
.net-topic-mobile-toc-root,
.net-topic-mobile-toc-fab { display: none; }

html.net-vip-site .net-topic-mobile-toc-fab {
  background: #3E2723;
  border-color: #C49A6C;
  box-shadow: 0 5px 16px rgba(62, 39, 35, .28);
}

@media (max-width: 1199px) {
  html.net-topic-mobile-toc-locked { overscroll-behavior: none; overflow: hidden; }

  .net-topic-mobile-toc-root { display: block; position: relative; z-index: 1200; }

  .net-topic-mobile-toc-fab {
    position: fixed;
    z-index: 1100;
    left: 14px;
    bottom: max(14px, env(safe-area-inset-bottom));
    display: inline-flex;
    min-width: 70px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 9px 13px;
    border: 1px solid #D4A574;
    border-radius: 22px;
    background: #135B6C;
    box-shadow: 0 5px 16px rgba(12, 59, 70, .26);
    color: #FFFDF8;
    font: 700 14px/1 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }
  .net-topic-mobile-toc-fab img { width: 19px; height: 19px; filter: brightness(0) invert(1); }
  .net-topic-mobile-toc-fab:focus-visible,
  .net-topic-mobile-toc-close:focus-visible,
  .net-topic-mobile-toc-global summary:focus-visible,
  .net-topic-mobile-toc-link:focus-visible,
  .net-topic-mobile-toc-sub-link:focus-visible,
  .net-topic-mobile-toc-top:focus-visible {
    outline: 3px solid rgba(201, 131, 63, .52);
    outline-offset: 2px;
  }

  .net-topic-mobile-toc-overlay {
    position: fixed;
    z-index: 1201;
    inset: 0;
    display: block;
    width: 100%;
    margin: 0;
    padding: 0;
    border: 0;
    background: rgba(31, 36, 37, .58);
    opacity: 0;
    visibility: hidden;
    cursor: default;
    transition: opacity 220ms ease, visibility 220ms ease;
  }

  .net-topic-mobile-toc-drawer {
    position: fixed;
    z-index: 1202;
    top: 0;
    bottom: 0;
    left: 0;
    display: flex;
    /* 与 `.net` 首页手机端目录抽屉保持同宽，避免专题页目录过宽。 */
    width: min(45.56vw, 188px);
    flex-direction: column;
    overflow: hidden;
    background: #FFF9EF;
    box-shadow: 12px 0 30px rgba(28, 29, 27, .18);
    color: #3E3935;
    transform: translateX(-104%);
    transition: transform 260ms cubic-bezier(.22, 1, .36, 1);
  }
  .net-topic-mobile-toc-drawer:focus { outline: none; }
  .net-topic-mobile-toc-root.is-open .net-topic-mobile-toc-overlay { opacity: 1; visibility: visible; }
  .net-topic-mobile-toc-root.is-open .net-topic-mobile-toc-drawer { transform: translateX(0); }
  .net-topic-mobile-toc-root.is-open .net-topic-mobile-toc-fab { opacity: 0; pointer-events: none; }

  .net-topic-mobile-toc-head {
    display: flex;
    min-height: 60px;
    align-items: center;
    justify-content: space-between;
    padding: 8px 8px 6px 16px;
    border-bottom: 1px solid #F0DEC7;
  }
  .net-topic-mobile-toc-title { margin: 0; color: #363532; font: 750 19px/1.2 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
  .net-topic-mobile-toc-close {
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 0;
    border-radius: 10px;
    background: transparent;
    cursor: pointer;
  }
  .net-topic-mobile-toc-close img { width: 24px; height: 24px; }
  .net-topic-mobile-toc-current {
    flex: 0 0 auto;
    margin: 0;
    padding: 8px 16px 9px;
    border-bottom: 1px solid #F0DEC7;
    color: #68645F;
    font-size: 14px;
    line-height: 1.4;
  }
  .net-topic-mobile-toc-current strong { color: #B86728; font-weight: 750; }
  .net-topic-mobile-toc-scroll {
    min-height: 0;
    flex: 1 1 auto;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 8px 12px 14px 16px;
    scrollbar-width: thin;
    scrollbar-color: #D9B482 transparent;
  }
  .net-topic-mobile-toc-global { margin-bottom: 10px; padding-bottom: 8px; border-bottom: 1px dashed #DFC9AB; }
  .net-topic-mobile-toc-global summary {
    display: flex;
    min-height: 44px;
    align-items: center;
    gap: 7px;
    cursor: pointer;
    list-style: none;
    padding: 5px 8px;
    border-radius: 8px;
    color: #4A2A18;
    font-size: 15px;
    font-weight: 700;
  }
  .net-topic-mobile-toc-global summary::-webkit-details-marker { display: none; }
  .net-topic-mobile-toc-global summary::before { content: "›"; color: #B7791F; font-size: 20px; line-height: 1; transition: transform .15s; }
  .net-topic-mobile-toc-global[open] summary::before { transform: rotate(90deg); }
  .net-topic-mobile-toc-global-nav { padding: 2px 0 0 8px; }
  .net-topic-mobile-toc-global-subnav { margin: 0 0 3px 12px; border-left: 1px dashed #DFC9AB; }
  .net-topic-mobile-toc-level { color: #9A7A5D; font-size: 11px; font-weight: 500; }
  .net-topic-mobile-toc-level-heading,
  .net-topic-mobile-toc-subtitle { margin: 8px 8px 3px; color: #9A7A5D; font-size: 11px; line-height: 1.4; letter-spacing: .04em; }
  .net-topic-mobile-toc-subtitle { margin-top: 14px; padding-top: 10px; border-top: 1px dashed #DFC9AB; }
  .net-topic-mobile-toc-local-nav,
  .net-topic-mobile-toc-subnav { margin: 0; padding: 0; list-style: none; }
  .net-topic-mobile-toc-subnav { margin-left: 10px; border-left: 1px dashed #DFC9AB; }
  .net-topic-mobile-toc-link,
  .net-topic-mobile-toc-local-link,
  .net-topic-mobile-toc-sub-link {
    display: flex;
    min-height: 44px;
    align-items: center;
    padding: 6px 8px 6px 12px;
    border-left: 2px solid transparent;
    border-radius: 0 8px 8px 0;
    color: #3F3D39;
    font-size: 15px;
    font-weight: 560;
    line-height: 1.35;
    text-decoration: none;
  }
  .net-topic-mobile-toc-link:hover,
  .net-topic-mobile-toc-local-link:hover,
  .net-topic-mobile-toc-sub-link:hover { background: #F9EEDF; color: #704323; }
  .net-topic-mobile-toc-global-subnav .net-topic-mobile-toc-link { min-height: 40px; padding-left: 10px; font-size: 14px; }
  .net-topic-mobile-toc-local-link.is-active { background: #FAEBCF; border-left-color: #C9833F; color: #075F70; font-weight: 750; }
  .net-topic-mobile-toc-sub-link { min-height: 40px; padding-left: 10px; color: #55504A; font-size: 14px; }
  .net-topic-mobile-toc-top {
    flex: 0 0 auto;
    min-height: 48px;
    margin: 0 12px 8px;
    border: 0;
    border-top: 1px solid #F0DEC7;
    background: transparent;
    color: #B86728;
    font: 650 14px/1.2 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    cursor: pointer;
  }

  @media (prefers-reduced-motion: reduce) {
    .net-topic-mobile-toc-overlay,
    .net-topic-mobile-toc-drawer { transition: none !important; }
  }
}