main.knowledge-page { display: block; container-type: inline-size; }
.knowledge-page { --kb-gap: 28px; }
.knowledge-page [hidden] { display: none !important; }
.knowledge-page svg { width: 18px; height: 18px; }
.kb-title-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
.kb-title-row h1 { font-size: 32px; font-weight: 700; }
.kb-title-row p { margin: 10px 0 0; color: var(--muted); font-size: 14px; line-height: 1.65; }
.kb-scope { color: var(--muted); font-size: 12px; line-height: 1.6; padding-top: 10px; white-space: nowrap; }
.kb-search { display: flex; align-items: center; gap: 12px; max-width: 100%; min-height: 56px; border: 1px solid var(--brand-neutral-400); border-radius: 6px; padding: 0 8px 0 18px; margin-bottom: 28px; }
.kb-search:focus-within { outline: 2px solid var(--blue); outline-offset: 2px; }
.kb-search > svg { width: 20px; height: 20px; color: var(--muted); }
.kb-search input { flex: 1; width: 100%; min-width: 0; height: 52px; padding: 0; border: 0; background: transparent; color: var(--ink); font: inherit; font-size: 15px; outline: none; }
.kb-search input::placeholder { color: var(--muted); opacity: 1; }
.kb-search input::-webkit-search-cancel-button { display: none; }
.kb-search button { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; gap: 10px; min-height: 40px; min-width: 40px; padding: 8px; border: 0; border-radius: 4px; background: transparent; color: var(--muted); font-size: 13px; font-weight: 600; }
.kb-search .kb-search-submit { padding-inline: 16px; color: var(--canvas); background: var(--ink); }
.kb-search-submit:hover { background: var(--brand-neutral-800); }
/* Four equal topic columns + three gaps use the full canvas width. */
.kb-categories { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 16px; margin-bottom: 30px; }
.kb-category { display: flex; flex-direction: column; align-items: stretch; gap: 12px; min-width: 0; padding: 20px 16px 16px; border: 1px solid var(--line); border-radius: 6px; background: var(--canvas); color: var(--ink); text-align: left; }
.kb-category:hover { border-color: var(--brand-neutral-400); }
.kb-category[aria-pressed=true] { border-color: var(--ink); background: var(--brand-neutral-50); outline: 1px solid var(--ink); outline-offset: -2px; }
.kb-category-title { display: flex; align-items: flex-start; gap: 8px; font-size: 13px; line-height: 1.5; }
.kb-category-title > svg { color: var(--muted); margin-top: 1px; width: 17px; height: 17px; }
.kb-category-title strong { flex: 1; font-weight: 600; }
.kb-category-title > svg:last-child { width: 13px; height: 16px; margin-top: 2px; }
.kb-category-description { color: var(--muted); font-size: 13px; line-height: 1.65; }
.kb-category-count { margin-top: auto; color: var(--muted); font-size: 12px; line-height: 1.6; font-variant-numeric: tabular-nums; }
.kb-tabs-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--line); margin-bottom: 28px; }
.kb-tabs { display: flex; gap: 28px; }
.kb-tabs button { display: flex; align-items: center; gap: 8px; min-height: 48px; padding: 12px 0; background: transparent; color: var(--muted); border: 0; border-bottom: 2px solid transparent; font-size: 14px; line-height: 1.5; white-space: nowrap; }
.kb-tabs button[aria-selected=true] { color: var(--ink); border-bottom-color: var(--ink); font-weight: 600; }
.kb-tabs [data-kb-favorite-count] { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.kb-catalog-grid { display: grid; grid-template-columns: minmax(0,1fr) 260px; align-items: start; gap: 36px; }
#kb-list-region { min-width: 0; }
#kb-list-region:focus { outline-offset: 6px; }
.kb-list-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.kb-list-heading h2, .kb-discovery h2, .kb-related h2 { margin: 0; font-size: 18px; line-height: 1.5; font-weight: 650; }
.kb-list-heading > span { color: var(--muted); font-size: 12px; white-space: nowrap; font-variant-numeric: tabular-nums; }
.kb-list { list-style: none; padding: 0; margin: 0; }
.kb-row { display: flex; align-items: flex-start; gap: 8px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.kb-row-link { display: flex; align-items: flex-start; gap: 12px; flex: 1; min-width: 0; }
.kb-row-link > svg { color: var(--muted); width: 17px; height: 18px; margin-top: 3px; }
.kb-row-copy { display: flex; flex-direction: column; gap: 7px; flex: 1; min-width: 0; }
.kb-row-copy strong { font-size: 14px; line-height: 1.5; font-weight: 600; }
.kb-row-copy > span { color: var(--muted); font-size: 13px; line-height: 1.6; }
.kb-row-copy small { color: var(--muted); font-size: 11px; line-height: 1.65; }
.kb-row-link time { flex-shrink: 0; margin: 3px 0 0 8px; color: var(--muted); font-size: 11px; line-height: 1.6; text-align: right; font-variant-numeric: tabular-nums; }
.kb-row-link:hover strong, .kb-text-button:hover, .kb-related a:hover, .kb-owners button:hover { color: var(--brand-blue-700); }
.kb-save { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; width: 32px; height: 32px; margin-top: -4px; border: 0; border-radius: 4px; background: transparent; color: var(--muted); padding: 0; }
.kb-save svg { width: 17px; height: 17px; }
.kb-save[aria-pressed=true] { color: var(--ink); }
.kb-save[aria-pressed=true] svg { fill: var(--ink); }
.kb-save:hover { background: var(--brand-neutral-100); }
.kb-button, .kb-text-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 40px; height: auto; width: auto; margin: 0; padding: 8px 12px; border: 1px solid var(--brand-neutral-300); border-radius: 6px; background: var(--canvas); color: var(--ink); font: inherit; font-size: 13px; line-height: 1.6; font-weight: 500; text-align: left; }
.kb-button:hover { border-color: var(--brand-neutral-500); }
.kb-text-button { border: 0; border-radius: 0; background: transparent; padding: 8px 0; }
.kb-more { margin-top: 14px; color: var(--muted); }
.kb-discovery { display: flex; flex-direction: column; gap: 32px; }
.kb-start { padding: 24px; border-radius: 6px; background: var(--brand-neutral-100); }
.kb-start p, .kb-owners p { color: var(--muted); font-size: 13px; line-height: 1.7; margin: 10px 0 16px; }
.kb-start ul { list-style: none; padding: 0; margin: 0; }
.kb-start li + li { border-top: 1px solid var(--brand-neutral-300); }
.kb-start a { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 0; min-height: 48px; font-size: 13px; line-height: 1.6; font-weight: 500; }
.kb-start li:last-child a { padding-bottom: 0; }
.kb-start a:hover span { text-decoration: underline; text-underline-offset: 4px; }
.kb-owners { padding-inline: 4px; }
.kb-owners h2 { font-size: 16px; }
.kb-owners button { display: flex; align-items: center; justify-content: space-between; gap: 12px; width: 100%; min-height: 44px; padding: 8px 0; border: 0; background: transparent; color: var(--ink); font-size: 13px; line-height: 1.6; text-align: left; }
.kb-owners button svg { width: 14px; height: 14px; }
.kb-demo-note { margin: 32px 0 0; max-width: 90ch; color: var(--muted); font-size: 11px; line-height: 1.7; }
.kb-empty { padding: 40px 0; }
.kb-empty h3 { font-size: 18px; margin: 0 0 10px; font-weight: 600; }
.kb-empty p { margin: 0 0 16px; max-width: 45ch; font-size: 14px; line-height: 1.7; color: var(--muted); }
.kb-loading { display: grid; gap: 20px; }
.kb-loading p { font-size: 14px; color: var(--muted); }
.kb-loading span { display: block; height: 64px; border-radius: 4px; background: var(--brand-neutral-100); }
.kb-reader-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin: -12px 0 28px; }
.kb-reader-toolbar .kb-text-button { color: var(--muted); }
/* 200px tree + flexible article + 160px contents + two 28px gaps fill the canvas. */
.kb-reader-grid { display: grid; grid-template-columns: 200px minmax(0,1fr) 160px; gap: var(--kb-gap); align-items: start; }
.kb-tree { position: sticky; top: calc(var(--header-height) + 28px); max-height: calc(100dvh - var(--header-height) - 56px); overflow-y: auto; scrollbar-width: thin; padding-right: 16px; border-right: 1px solid var(--line); }
.kb-tree summary { display: flex; align-items: center; gap: 8px; min-height: 40px; padding: 8px 0; list-style: none; color: var(--muted); font-size: 13px; line-height: 1.6; cursor: pointer; }
.kb-tree summary::-webkit-details-marker, .kb-mobile-toc summary::-webkit-details-marker { display: none; }
.kb-tree summary span { flex: 1; }
.kb-tree summary > svg { width: 15px; height: 15px; }
.kb-tree summary > svg:last-child { width: 12px; height: 12px; }
.kb-tree details[open] > summary > svg:last-child { transform: rotate(90deg); }
.kb-tree-disclosure > summary { color: var(--ink); font-weight: 600; cursor: pointer; margin-bottom: 8px; }
.kb-tree-disclosure > summary > svg { display: none; }
.kb-tree-branches > details { margin-bottom: 10px; }
.kb-tree-branches > details[open] > summary { color: var(--ink); font-weight: 600; }
.kb-tree ul { list-style: none; padding: 0; margin: 0 0 8px 8px; }
.kb-tree a { display: block; padding: 8px 10px; margin: 2px 0; border-radius: 4px; font-size: 13px; line-height: 1.65; color: var(--muted); }
.kb-tree a[aria-current=page] { color: var(--ink); font-weight: 600; background: var(--brand-neutral-100); }
.kb-tree a:hover { color: var(--brand-blue-700); }
.kb-article { min-width: 0; }
.kb-article-category { margin: 4px 0 14px; color: var(--muted); font-size: 12px; line-height: 1.6; }
.kb-article h1 { font-size: 30px; line-height: 1.3; font-weight: 700; letter-spacing: -.025em; }
.kb-article-lead { margin: 16px 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.kb-article-meta { display: flex; flex-wrap: wrap; gap: 6px 18px; color: var(--muted); font-size: 11px; line-height: 1.7; }
.kb-article-meta > span { display: flex; align-items: center; gap: 5px; }
.kb-article-meta svg { width: 13px; height: 13px; }
.kb-article-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.kb-article-example { margin: 24px 0 28px; padding: 12px 14px; border-radius: 4px; background: var(--brand-neutral-100); color: var(--muted); font-size: 11px; line-height: 1.7; }
.kb-article-content section + section { margin-top: 32px; }
.kb-article-content h2 { display: flex; align-items: baseline; gap: 9px; margin: 0 0 14px; font-size: 19px; font-weight: 650; line-height: 1.5; letter-spacing: -.01em; scroll-margin-top: calc(var(--header-height) + 28px); }
.kb-article-content h2:focus { outline: none; }
.kb-section-number { font-size: 15px; color: var(--brand-neutral-600); font-weight: 400; font-variant-numeric: tabular-nums; }
.kb-article-content p, .kb-article-content li { font-size: 14px; line-height: 1.85; }
.kb-article-content p { margin: 0 0 14px; }
.kb-article-content ul { margin: 14px 0 0; padding-left: 20px; }
.kb-article-content li { padding-left: 5px; margin-block: 8px; }
.kb-article-content li::marker { color: var(--brand-neutral-600); }
.kb-article-bottom { display: flex; flex-direction: column; gap: 6px; border-top: 1px solid var(--line); margin-top: 32px; padding-top: 24px; }
.kb-article-bottom span { color: var(--muted); font-size: 12px; line-height: 1.6; }
.kb-article-bottom strong { font-size: 13px; font-weight: 500; }
.kb-related { margin-top: 32px; }
.kb-related h2 { margin-bottom: 12px; }
.kb-related a { display: flex; justify-content: space-between; align-items: center; gap: 16px; min-height: 48px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 13px; line-height: 1.6; }
.kb-toc { position: sticky; top: calc(var(--header-height) + 32px); padding-top: 4px; }
.kb-toc h2 { font-size: 12px; line-height: 1.6; font-weight: 600; margin: 0 0 12px; }
.kb-toc ol, .kb-mobile-toc ol { list-style: none; padding: 0; margin: 0; }
.kb-toc button, .kb-mobile-toc button { padding: 8px 0; border: 0; background: transparent; color: var(--muted); font-size: 13px; line-height: 1.65; text-align: left; }
.kb-toc button:hover, .kb-mobile-toc button:hover { color: var(--brand-blue-700); }
.kb-toc p { margin: 24px 0 0; color: var(--muted); font-size: 11px; line-height: 1.7; }
.kb-mobile-toc { display: none; margin: 0 0 28px; border-block: 1px solid var(--line); }
.kb-mobile-toc summary { display: flex; align-items: center; justify-content: space-between; min-height: 44px; padding: 10px 0; font-size: 13px; cursor: pointer; }
.kb-mobile-toc[open] summary svg { transform: rotate(90deg); }
.kb-editor-dialog { width: 480px; max-width: calc(100vw - 32px); padding: 28px; border: 1px solid var(--line); border-radius: 8px; background: var(--canvas); color: var(--ink); box-shadow: 0 12px 40px var(--overlay-shadow); }
.kb-editor-dialog::backdrop { background: var(--overlay-backdrop); }
.kb-dialog-heading { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-top: -10px; }
.kb-dialog-heading h2 { font-size: 20px; line-height: 1.4; }
.kb-editor-dialog p { font-size: 14px; line-height: 1.75; }
.kb-editor-dialog .kb-dialog-note { color: var(--muted); font-size: 12px; }
.kb-editor-dialog > .kb-button { margin-top: 12px; }
@container (max-width: 1000px) {
  .kb-categories { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .kb-category { gap: 8px; padding: 16px; }
  .kb-category-description { margin-left: 25px; }
  .kb-category-count { margin-left: 25px; }
  .kb-scope { display: none; }
  .kb-catalog-grid { grid-template-columns: minmax(0,1fr) 220px; gap: 24px; }
  .kb-row-link time { display: none; }
  .kb-start { padding: 20px; }
  .kb-reader-grid { grid-template-columns: 180px minmax(0,1fr); gap: 24px; }
  .kb-toc { display: none; }
  .kb-mobile-toc { display: block; }
}
@container (max-width: 760px) {
  .kb-catalog-grid { grid-template-columns: minmax(0,1fr); }
  .kb-discovery { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  .kb-reader-grid { grid-template-columns: minmax(0,1fr); }
  .kb-tree { position: static; max-height: none; border: 1px solid var(--line); border-radius: 6px; padding: 4px 14px; }
  .kb-tree-disclosure > summary { margin-bottom: 0; justify-content: space-between; }
  .kb-tree-disclosure > summary > svg { display: block; }
  .kb-tree-branches { padding-top: 8px; }
  .kb-article { max-width: 680px; width: 100%; margin-inline: auto; }
  .kb-reader-toolbar { margin-bottom: 20px; }
}
@container (max-width: 500px) {
  .kb-title-row { margin-bottom: 20px; }
  .kb-title-row h1, .kb-article h1 { font-size: 26px; }
  .kb-title-row p { font-size: 13px; }
  .kb-search { gap: 8px; padding-left: 12px; margin-bottom: 20px; }
  .kb-search input { font-size: 16px; }
  .kb-search .kb-search-submit { font-size: 12px; padding-inline: 10px; }
  .kb-search-submit svg { display: none; }
  .kb-categories { grid-template-columns: none; grid-auto-flow: column; grid-auto-columns: 156px; overflow-x: auto; scroll-snap-type: x proximity; gap: 10px; margin: 0 -2px 20px; padding: 2px 2px 8px; scrollbar-width: thin; }
  .kb-category { padding: 12px; min-height: 88px; scroll-snap-align: start; }
  .kb-category-title { font-size: 13px; gap: 6px; }
  .kb-category-title > svg:first-child { display: none; }
  .kb-category-title > svg:last-child { width: 12px; }
  .kb-category-description { display: none; }
  .kb-category-count { margin-left: 0; font-size: 12px; }
  .kb-tabs-row { flex-wrap: wrap; gap: 0; margin-bottom: 24px; }
  .kb-tabs { gap: 24px; }
  .kb-reset-filter { min-height: 44px; }
  .kb-list-heading h2 { font-size: 16px; }
  .kb-list-heading > span { font-size: 11px; }
  .kb-row { gap: 0; padding-block: 16px; }
  .kb-row-link { gap: 8px; }
  .kb-row-link > svg { display: none; }
  .kb-row-copy strong { font-size: 14px; }
  .kb-row-copy > span { font-size: 13px; }
  .kb-row-copy small { font-size: 12px; }
  .kb-save { width: 44px; height: 44px; }
  .kb-discovery { grid-template-columns: minmax(0,1fr); gap: 28px; }
  .kb-demo-note { font-size: 12px; }
  .kb-reader-toolbar { flex-wrap: wrap; gap: 0 12px; }
  .kb-reader-toolbar .kb-text-button { font-size: 12px; min-height: 44px; }
  .kb-article-category { margin-top: 0; }
  .kb-article-actions { gap: 8px; }
  .kb-button { font-size: 12px; padding-inline: 10px; min-height: 44px; }
  .kb-article-actions .kb-save { width: auto; }
  .kb-article-actions svg { width: 15px; height: 15px; }
  .kb-article-meta, .kb-article-example { font-size: 12px; }
  .kb-article-content h2 { font-size: 19px; }
  .kb-mobile-toc button, .kb-tree a { min-height: 44px; font-size: 13px; }
  .kb-editor-dialog { padding: 20px; }
}
@media (max-width: 760px) { main.knowledge-page { padding-inline: 20px; } }
@media (prefers-reduced-motion: reduce) { .knowledge-page * { scroll-behavior: auto; } }