/* Compact knowledge workspace: navigation, search and content stay in one visual system. */
body.content-app { min-width: 0; background: var(--app-bg); color: var(--app-text); }
.content-topbar { min-height: 64px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; padding: 10px max(18px, 4vw); border-bottom: 1px solid var(--app-line); background: var(--app-bg); }
.content-topbar .brand { flex: 0 0 auto; color: var(--app-text); }
.content-topbar .brand-mark-img { width: 28px; height: 28px; }
.content-topbar .brand small { color: var(--app-faint); font-size: 12px; letter-spacing: .08em; }
.content-topbar nav { display: flex; gap: 15px; margin-left: auto; color: var(--app-muted); font-size: 12px; }
.content-topbar nav a:hover { color: var(--app-accent); }
.content-top-actions { display: flex; align-items: center; flex: 0 0 auto; gap: 10px; }
@media (max-width: 1100px) { .content-topbar .brand small { display: none; } }
@media (max-width: 960px) { .content-topbar nav { display: none; } .content-top-actions { margin-left: auto; } }
.content-top-actions .header-account { color: var(--app-muted); font-size: 12px; }
.content-app .content-top-actions .header-online,
.content-app .content-top-actions .header-download {
  display: inline-flex;
  width: auto;
  min-width: 0;
  height: auto;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border: 1px solid var(--app-accent);
  border-radius: 10px;
  background: var(--app-accent);
  color: var(--app-accent-ink);
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}
.content-app .content-top-actions .header-download::after { content: none; display: none; }
.content-app .content-top-actions .header-online:hover,
.content-app .content-top-actions .header-download:hover {
  background: var(--app-accent-readable);
  color: var(--app-accent-ink);
}
.knowledge-shell { width: min(calc(100% - 36px), 1380px); display: grid; grid-template-columns: 238px minmax(0, 1fr); gap: 18px; margin: 0 auto; padding: 22px 0 70px; }
.knowledge-sidebar { position: sticky; top: 18px; align-self: start; max-height: calc(100vh - 36px); overflow: auto; border: 1px solid var(--app-line); border-radius: 12px; background: var(--app-panel); }
.sidebar-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 16px 15px; border-bottom: 1px solid var(--app-line); }
.sidebar-head strong { font-size: 13px; }
.sidebar-head small { color: var(--app-faint); font-size: 12px; }
.sidebar-close { display: none; border: 0; background: transparent; color: var(--app-muted); font-size: 18px; }
.sidebar-group { padding: 13px 10px 6px; }
.sidebar-label { padding: 0 7px 7px; color: var(--app-faint); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.sidebar-link, .sidebar-filter { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 34px; margin: 2px 0; padding: 8px 9px; border: 1px solid transparent; border-radius: 7px; background: transparent; color: var(--app-muted); font-size: 12px; text-align: left; }
.sidebar-link:hover, .sidebar-filter:hover, .sidebar-link.is-active, .sidebar-filter.is-active { border-color: color-mix(in srgb, var(--app-accent) 36%, var(--app-line)); background: var(--app-accent-soft); color: var(--app-text); }
.sidebar-link b, .sidebar-filter b { color: var(--app-accent); font-size: 12px; }
.sidebar-cta { margin: 12px 10px 14px; padding: 13px; border: 1px solid var(--app-accent); border-radius: 9px; background: var(--app-bg); }
.sidebar-cta strong, .sidebar-cta span { display: block; }
.sidebar-cta strong { font-size: 12px; }
.sidebar-cta span { margin-top: 5px; color: var(--app-muted); font-size: 12px; line-height: 1.6; }
.sidebar-cta a { display: inline-flex; margin-top: 9px; color: var(--app-accent); font-size: 12px; font-weight: 700; }
.knowledge-main { min-width: 0; }
.knowledge-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(160px, auto); align-items: start; gap: 18px; padding: 10px 0 18px; border-bottom: 1px solid var(--app-line); }
.knowledge-head h1 { margin: 0; font-family: "Newsreader", "Songti SC", serif; font-size: clamp(30px, 3.1vw, 44px); line-height: 1.06; letter-spacing: -.035em; }
.knowledge-head h1 em { color: var(--app-accent); font-style: normal; }
.knowledge-head p { max-width: 680px; margin: 10px 0 0; color: var(--app-muted); font-size: 13px; line-height: 1.75; }
.knowledge-stats { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; color: var(--app-faint); font-size: 12px; text-align: right; }
.knowledge-stats b { color: var(--app-accent); }
.content-toolbar { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; align-items: center; gap: 9px; padding: 14px 0; }
.content-search { min-width: 0; flex: 1 1 320px; height: 38px; padding: 0 12px; border: 1px solid var(--app-line); border-radius: 7px; outline: 0; background: var(--app-panel); color: var(--app-text); }
.content-search:focus { border-color: var(--app-accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--app-accent) 16%, transparent); }
.content-search::placeholder { color: var(--app-faint); }
.content-sort, .content-view-toggle { flex: 0 0 auto; height: 38px; padding: 0 10px; border: 1px solid var(--app-line); border-radius: 7px; background: var(--app-panel); color: var(--app-muted); font-size: 12px; }
.content-view-toggle { display: inline-flex; align-items: center; cursor: pointer; }
.content-view-toggle.is-active { border-color: var(--app-accent); color: var(--app-accent); }
.content-list-meta { min-height: 18px; margin: 0 0 10px; color: var(--app-faint); font-size: 12px; }
.content-article-list { display: grid; gap: 9px; }
.content-article-list.is-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
.article-row { display: grid; grid-template-columns: 168px minmax(0, 1fr); min-height: 152px; border: 1px solid var(--app-line); border-radius: 10px; background: var(--app-panel); overflow: hidden; }
.article-row:hover { border-color: color-mix(in srgb, var(--app-accent) 56%, var(--app-line)); }
.article-row figure { position: relative; min-height: 152px; margin: 0; background: var(--app-panel-2); overflow: hidden; }
.article-row figure img { width: 100%; height: 100%; object-fit: cover; opacity: .82; }
.article-row figure span { position: absolute; left: 9px; bottom: 9px; padding: 4px 6px; border: 1px solid var(--app-line); border-radius: 5px; background: color-mix(in srgb, var(--app-bg) 86%, transparent); color: var(--app-accent); font-size: 11px; }
.article-row-body { min-width: 0; display: flex; flex-direction: column; padding: 15px 17px; }
.article-row-meta { display: flex; flex-wrap: wrap; gap: 8px; color: var(--app-accent); font-size: 11px; }
.article-row h2 { margin: 10px 0 6px; font-size: 17px; line-height: 1.35; }
.article-row h2 a { color: inherit; text-decoration: none; }
.article-row h2 a:hover { color: var(--app-accent); }
.article-row p { margin: 0; color: var(--app-muted); font-size: 12px; line-height: 1.65; }
.article-row-footer { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: auto; padding-top: 11px; }
.article-row-footer small { color: var(--app-faint); font-size: 12px; }
.article-row-footer a { color: var(--app-accent); font-size: 12px; font-weight: 700; }
.article-row-footer a:hover { color: var(--app-text); }
.content-empty { padding: 54px 20px; border: 1px dashed var(--app-line); border-radius: 10px; color: var(--app-muted); text-align: center; }
.topic-strip { display: flex; gap: 7px; overflow-x: auto; padding: 0 0 12px; }
.topic-strip a { flex: 0 0 auto; padding: 7px 9px; border: 1px solid var(--app-line); border-radius: 999px; color: var(--app-muted); font-size: 12px; }
.topic-strip a:hover { border-color: var(--app-accent); color: var(--app-accent); }
.reader-layout { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 18px; }
.reader { min-width: 0; padding: 24px 26px; border: 1px solid var(--app-line); border-radius: 12px; background: var(--app-panel); }
.reader-kicker { color: var(--app-accent); font-size: 12px; font-weight: 800; letter-spacing: .08em; }
.reader h1 { margin: 12px 0 0; font-family: "Newsreader", "Songti SC", serif; font-size: clamp(36px, 4.5vw, 63px); line-height: 1.03; letter-spacing: -.04em; }
.reader-lede { max-width: 820px; margin: 15px 0 0; color: var(--app-muted); line-height: 1.8; }
.reader-hero { width: 100%; max-height: 330px; margin: 22px 0; border: 1px solid var(--app-line); border-radius: 9px; object-fit: cover; }
.reader-blocks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 9px; margin-top: 22px; }
.reader-block { padding: 16px; border: 1px solid var(--app-line); border-radius: 8px; background: var(--app-bg); }
.reader-block h2 { margin: 0; font-size: 15px; }
.reader-block p, .reader-block ol { margin: 9px 0 0; color: var(--app-muted); font-size: 13px; line-height: 1.8; }
.reader-block ol { padding-left: 17px; }
.reader-result { margin-top: 18px; padding: 14px 16px; border-left: 2px solid var(--app-accent); background: var(--app-accent-soft); color: var(--app-text); line-height: 1.75; }
.reader-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.reader-actions a { display: inline-flex; min-height: 36px; align-items: center; padding: 0 12px; border: 1px solid var(--app-line); border-radius: 7px; color: var(--app-muted); font-size: 12px; font-weight: 700; }
.reader-actions a.primary { border-color: var(--app-accent); background: var(--app-accent); color: var(--app-accent-ink); }
.reader-actions a:hover { border-color: var(--app-accent); color: var(--app-accent); }
.reader-side { position: sticky; top: 18px; align-self: start; display: grid; gap: 9px; }
.reader-side section { padding: 14px; border: 1px solid var(--app-line); border-radius: 9px; background: var(--app-panel); }
.reader-side h2 { margin: 0; font-size: 13px; }
.reader-side a { display: block; margin-top: 10px; color: var(--app-muted); font-size: 12px; line-height: 1.5; }
.reader-side a:hover { color: var(--app-accent); }
.tutorial-list-compact { display: grid; gap: 9px; }
.tutorial-card-compact { scroll-margin-top: 20px; padding: 22px; border: 1px solid var(--app-line); border-radius: 10px; background: var(--app-panel); }
.tutorial-card-compact.is-current { border-color: color-mix(in srgb, var(--app-accent) 54%, var(--app-line)); box-shadow: 0 10px 26px color-mix(in srgb, var(--app-shadow) 24%, transparent); }
.tutorial-card-compact.is-highlight { border-color: var(--app-accent); }
.tutorial-card-compact h2 { margin: 0; font-family: "Newsreader", "Songti SC", serif; font-size: clamp(25px, 3vw, 40px); line-height: 1.1; }
.tutorial-card-compact h2 small { display: block; margin-top: 7px; color: var(--app-muted); font: 600 12px/1.4 "Instrument Sans", sans-serif; letter-spacing: .08em; }
.tutorial-card-compact .lead { max-width: 760px; margin: 12px 0 0; color: var(--app-muted); line-height: 1.75; }
.tutorial-mini-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 17px; }
.tutorial-mini { padding: 13px; border: 1px solid var(--app-line); border-radius: 7px; background: var(--app-bg); }
.tutorial-mini h3 { margin: 0; font-size: 13px; }
.tutorial-mini p, .tutorial-mini ol { margin: 7px 0 0; color: var(--app-muted); font-size: 12px; line-height: 1.7; }
.tutorial-mini ol { padding-left: 17px; }
.tutorial-image { width: 100%; max-height: 300px; margin-top: 16px; border: 1px solid var(--app-line); border-radius: 8px; object-fit: cover; }
.tutorial-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tutorial-actions a { display: inline-flex; min-height: 34px; align-items: center; padding: 0 11px; border: 1px solid var(--app-line); border-radius: 7px; color: var(--app-muted); font-size: 12px; font-weight: 700; }
.tutorial-actions a:hover { border-color: var(--app-accent); color: var(--app-accent); }
.content-footer { width: min(calc(100% - 36px), 1380px); margin: 0 auto; padding: 24px 0 34px; border-top: 1px solid var(--app-line); color: var(--app-faint); font-size: 12px; }
@media (max-width: 1050px) { .knowledge-shell { grid-template-columns: 210px minmax(0, 1fr); } .article-row { grid-template-columns: 135px minmax(0, 1fr); } .content-article-list.is-grid { grid-template-columns: 1fr; } .reader-layout { grid-template-columns: 1fr; } .reader-side { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); } .knowledge-head { grid-template-columns: 1fr; } .content-toolbar { grid-template-columns: minmax(0, 1fr) auto auto; } }
@media (max-width: 760px) { .content-topbar { min-height: 58px; padding: 9px 14px; } .content-topbar nav, .content-top-actions .header-account, .content-top-actions .theme-switcher { display: none; } .content-top-actions { margin-left: auto; } .knowledge-shell { width: min(calc(100% - 24px), 640px); grid-template-columns: 1fr; padding-top: 12px; } .knowledge-sidebar { position: fixed; z-index: 20; top: 0; bottom: 0; left: 0; width: min(86vw, 300px); max-height: none; border-radius: 0 12px 12px 0; transform: translateX(-105%); transition: transform .2s ease; } body.sidebar-open .knowledge-sidebar { transform: translateX(0); } .sidebar-close { display: block; } .sidebar-toggle { display: inline-flex; min-height: 34px; align-items: center; padding: 0 10px; border: 1px solid var(--app-line); border-radius: 7px; background: var(--app-panel); color: var(--app-muted); font-size: 12px; } .knowledge-head { display: block; } .knowledge-stats { justify-content: flex-start; margin-top: 13px; text-align: left; } .content-toolbar { flex-wrap: wrap; } .content-search { flex-basis: 100%; } .article-row { grid-template-columns: 96px minmax(0, 1fr); min-height: 126px; } .article-row figure { min-height: 126px; } .article-row-body { padding: 12px; } .article-row h2 { font-size: 15px; } .article-row p { display: -webkit-box; overflow: hidden; -webkit-box-orient: vertical; -webkit-line-clamp: 2; } .reader { padding: 20px 16px; } .reader-blocks, .tutorial-mini-grid, .reader-side { grid-template-columns: 1fr; } }
@media (min-width: 761px) { .sidebar-toggle { display: none; } }

/* Search-answer articles: direct answer first, evidence and conversion after the complete solution. */
.seo-article-shell { width: min(calc(100% - 36px), 1120px); margin: 0 auto; padding: 22px 0 72px; }
.seo-breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; color: var(--app-faint); font-size: 12px; }
.seo-breadcrumb a:hover { color: var(--app-accent); }
.seo-article { padding: clamp(22px, 4vw, 52px); border: 1px solid var(--app-line); border-radius: 16px; background: var(--app-panel); }
.seo-article-hero { max-width: 900px; }
.seo-article-hero h1 { margin: 14px 0 0; font-family: "Newsreader", "Songti SC", serif; font-size: clamp(34px, 5vw, 62px); line-height: 1.07; letter-spacing: -.035em; }
.seo-article-description { max-width: 820px; margin: 18px 0 0; color: var(--app-muted); font-size: 17px; line-height: 1.85; }
.seo-keywords, .seo-byline { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.seo-keywords span { padding: 5px 9px; border: 1px solid var(--app-line); border-radius: 999px; color: var(--app-muted); font-size: 12px; }
.seo-byline { color: var(--app-faint); font-size: 12px; }
.seo-byline > * + *::before { content: "·"; margin-right: 8px; }
.seo-direct-answer { margin: 30px 0; padding: 20px 22px; border-left: 3px solid var(--app-accent); background: var(--app-accent-soft); }
.seo-direct-answer strong { color: var(--app-accent); font-size: 13px; }
.seo-direct-answer p { margin: 8px 0 0; font-size: 17px; line-height: 1.9; }
.seo-article-body { max-width: 840px; }
.seo-article-section { padding: 26px 0; border-top: 1px solid var(--app-line); }
.seo-article-section h2, .seo-checklist h2, .seo-product-solution h2, .seo-faq h2, .seo-related h2 { margin: 0; font-size: clamp(22px, 3vw, 31px); line-height: 1.25; }
.seo-article-section p { margin: 14px 0 0; color: var(--app-muted); font-size: 16px; line-height: 2; }
.seo-checklist { margin-top: 24px; padding: 24px; border: 1px solid var(--app-line); border-radius: 12px; background: var(--app-bg); }
.seo-checklist ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 24px; margin: 18px 0 0; padding-left: 20px; color: var(--app-muted); line-height: 1.7; }
.seo-product-solution { display: flex; align-items: center; justify-content: space-between; gap: 28px; margin-top: 28px; padding: 26px; border: 1px solid color-mix(in srgb, var(--app-accent) 48%, var(--app-line)); border-radius: 12px; background: var(--app-accent-soft); }
.seo-product-solution span { color: var(--app-accent); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.seo-product-solution h2 { margin-top: 8px; }
.seo-product-solution p { max-width: 700px; margin: 10px 0 0; color: var(--app-muted); line-height: 1.8; }
.seo-product-solution .button { flex: 0 0 auto; }
.seo-faq, .seo-related, .seo-method-note { margin-top: 32px; padding-top: 28px; border-top: 1px solid var(--app-line); }
.seo-faq details { padding: 15px 0; border-bottom: 1px solid var(--app-line); }
.seo-faq summary { cursor: pointer; font-weight: 800; }
.seo-faq details p { margin: 10px 0 0; color: var(--app-muted); line-height: 1.8; }
.seo-related > div { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 16px; }
.seo-related a { display: grid; gap: 7px; padding: 16px; border: 1px solid var(--app-line); border-radius: 9px; background: var(--app-bg); }
.seo-related a:hover { border-color: var(--app-accent); }
.seo-related span, .seo-method-note p { color: var(--app-muted); font-size: 13px; line-height: 1.7; }
.seo-method-note strong { color: var(--app-accent); }
.seo-method-note p { margin: 8px 0 0; }
@media (max-width: 760px) { .seo-article-shell { width: min(calc(100% - 20px), 640px); padding-top: 12px; } .seo-article { padding: 22px 16px; } .seo-article-description, .seo-direct-answer p, .seo-article-section p { font-size: 15px; } .seo-checklist ul, .seo-related > div { grid-template-columns: 1fr; } .seo-product-solution { display: block; } .seo-product-solution .button { margin-top: 18px; } }