@media (min-width: 1100px) {

  /*
    Long-document pages declare `main.doc { margin: 0 auto; }` in a later
    page-local style block. Keep this selector more specific so that the
    contents rail cannot cover the document at the 1100px breakpoint.
  */
  html body main.doc {
    margin-left: calc(320px + clamp(0px, (100vw - 1280px) * 0.15, 150px));
    margin-right: auto;
  }
  html.doc-toc-collapsed body main.doc {
    margin-left: calc(90px + clamp(0px, (100vw - 1280px) * 0.20, 240px));
  }
}

.doc-toc {
  display: block;
  position: relative;
  width: 100%;
  max-width: 100%;
  margin: 12px 0 28px;
  border: 0;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
  background: transparent;
}
.doc-toc .doc-toc-head {
  display: none;
  padding: 12px 16px;
  cursor: pointer;
  border-bottom: 0;
  margin-bottom: 0;
}
.doc-toc-mobile-toggle{display:flex;width:100%;min-height:48px;align-items:center;justify-content:space-between;padding:12px 16px;border:0;background:transparent;color:var(--ink);font:600 14px/1.3 var(--serif);cursor:pointer}
.doc-toc-mobile-toggle::after{content:"\25BE";color:var(--ink-3);font-size:14px;transition:transform .15s}
.doc-toc-mobile-toggle[aria-expanded="true"]::after{transform:rotate(180deg)}
.doc-toc .doc-toc-list {
  display: none;
  max-height: 60vh;
  overflow-y: auto;
  padding: 0 14px 14px;
  border-top: 1px dotted var(--rule-soft);
}
.doc-toc.doc-toc-mobile-open .doc-toc-list {
  display: block;
}
.doc-find{display:none;padding:12px 14px;border-top:1px dotted var(--rule-soft)}
.doc-toc.doc-toc-mobile-open .doc-find{display:block}
.doc-toc.doc-toc-find-only .doc-toc-list{display:none !important}
.doc-find label{display:block;margin-bottom:6px;font-family:var(--sans);font-size:10.5px;letter-spacing:0;text-transform:none;color:var(--ink-3)}
.doc-find-row{display:grid;grid-template-columns:minmax(0,1fr) auto auto}
.doc-find input{min-width:0;min-height:40px;padding:8px;border:1px solid var(--rule-soft);background:var(--paper);color:var(--ink);font:14px/1.3 var(--serif)}
.doc-find button{min-height:40px;padding:0 8px;border:1px solid var(--rule-soft);border-left:0;background:var(--paper-2);color:var(--ink-2);font:10px/1 var(--sans);cursor:pointer}
.doc-find button:disabled{opacity:.35;cursor:default}
.doc-find-status{display:block;min-height:17px;margin-top:5px;font:10px/1.4 var(--sans);color:var(--ink-3)}
.doc-body .doc-find-hit{background:rgba(251,228,138,.18)}
.doc-body .doc-find-current{background:rgba(251,228,138,.62);outline:2px solid rgba(61,74,87,.45);outline-offset:3px}
.doc-toc .doc-toc-collapse {
  display: none;
}

@media (min-width: 1100px) {
  .doc-toc {
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    /* Sit below both the site header and the long-document context bar. */
    top: calc(var(--topbar-h, 56px) + 42px);
    bottom: 24px;
    width: 280px;
    padding: 0 16px 0 28px;
    margin: 0;
    border-right: 1px solid var(--rule-soft);
    border-top: 0;
    border-bottom: 0;
    border-left: 0;
    background: var(--paper);
    z-index: 30;
  }

  .doc-toc .doc-toc-head { cursor: default; padding: 12px 0 8px; border-bottom: 1px dotted var(--rule-soft); margin-bottom: 8px; }
  .doc-toc .doc-toc-head { display:flex; }
  .doc-toc-mobile-toggle{display:none}
  .doc-toc .doc-toc-collapse { display: flex; }
  .doc-toc .doc-toc-list { display: block; max-height: none; overflow-y: auto; padding-right: 6px; border-top: 0; }
  .doc-toc .doc-find{display:block;padding:0 0 10px;border-top:0;border-bottom:1px dotted var(--rule-soft);margin-bottom:6px}
  .doc-find-row{grid-template-columns:minmax(0,1fr) 34px 34px}
  .doc-find button{font-size:0;padding:0}
  .doc-find-prev::before{content:"↑";font-size:13px}
  .doc-find-next::before{content:"↓";font-size:13px}
}

.doc-toc-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0 8px;
  border-bottom: 1px dotted var(--rule-soft);
  margin-bottom: 8px;
  flex: 0 0 auto;
}
.doc-toc-head h2 {
  margin: 0;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink-3);
  font-weight: 600;
}
.doc-toc-collapse {
  background: none;
  border: 1px solid var(--rule-soft);
  width: 28px;
  height: 28px;
  border-radius: 0;
  color: var(--ink-3);
  font: inherit;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .12s, border-color .12s, color .12s;
}
.doc-toc-collapse:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.doc-toc-collapsed .doc-toc-collapse::before {
  content: "\203A";
}
.doc-toc-collapsed .doc-toc-collapse {
  font-size: 0;
}
.doc-toc-collapsed .doc-toc-collapse::before {
  font-size: 14px;
}

.doc-toc-list {
  overflow-y: auto;
  flex: 1 1 auto;
  scrollbar-width: thin;
  padding-right: 6px;
}
.doc-toc-list::-webkit-scrollbar {
  width: 4px;
}
.doc-toc-list::-webkit-scrollbar-thumb {
  background: var(--rule-soft);
}

.doc-toc-item {
  display: block;
  padding: 5px 8px 5px 8px;
  font-family: var(--serif);
  font-size: 12.5px;
  line-height: 1.35;
  color: var(--ink-3);
  text-decoration: none;
  border-left: 2px solid transparent;
}
.doc-toc-item:hover {
  color: var(--ink);
  background: var(--paper-2);
}
.doc-toc-item.cur {
  color: var(--ink);
  border-left-color: var(--accent);
  background: var(--paper-2);
}

.doc-toc-item.lvl-2 {
  font-weight: 600;
  color: var(--ink);
  font-size: 12.5px;
  margin-top: 10px;
}
.doc-toc-item.lvl-2:first-child { margin-top: 0; }
.doc-toc-item.lvl-3 {
  padding-left: 18px;
  font-size: 12px;
  color: var(--ink-2);
  font-weight: 400;
}
.doc-toc-item.lvl-4 {
  padding-left: 28px;
  font-size: 11.5px;
  color: var(--ink-3);
  font-weight: 400;
  font-style: italic;
}

.doc-toc-item.cur.lvl-3 { font-weight: 500; color: var(--ink); }
.doc-toc-item.cur.lvl-4 { font-weight: 500; color: var(--ink); font-style: italic; }

.doc-toc-collapsed .doc-toc {
  width: 36px;
  padding: 0 4px 0 8px;
}
.doc-toc-collapsed .doc-toc-list,
.doc-toc-collapsed .doc-find,
.doc-toc-collapsed .doc-toc-head h2 {
  display: none;
}
.doc-toc-collapsed .doc-toc-head {
  border-bottom: 0;
  margin: 0;
  padding-top: 12px;
}

@media (max-width:1099px) {
  .doc-find input,.doc-find button{min-height:44px}
  .doc-find button{min-width:44px}
  .doc-toc-item{display:flex;align-items:center;min-height:44px;padding-top:8px;padding-bottom:8px}
}

@media print {
  .doc-toc { display: none; }
  main.doc { margin-left: 0 !important; }
}