@font-face {
  font-family: 'Latin Modern Math';
  src: url('./community-math.6075562b771f8b82.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* Community is self-contained; this stylesheet does not alter product pages. */
.community-page {
  --font-math: 'Latin Modern Math', math;
  --c-space-1: 8px;
  --c-space-2: 16px;
  --c-space-3: 24px;
  --c-space-4: 40px;
  --c-space-5: 64px;
  --c-zone-padding: 64px;
  --c-opening-boundary-padding: 32px;
  --c-opening-title-space: 120px;
  --c-opening-art-size: 680px;
  --c-opening-art-top: -205px;
  --c-opening-art-right: max(-200px, calc((100% - var(--c-content-width)) / 2 - 200px));
  --c-opening-art-blur: 7px;
  --c-opening-art-opacity: .8;
  --c-gutter: 40px;
  --c-content-width: 1160px;
  --c-readable-width: 66ch;
  --c-type-meta: .8125rem;
  --c-type-support: .875rem;
  --c-type-body: 1rem;
  --c-type-reading: 1.0625rem;
  --c-type-small-label: .75rem;
  --c-type-row: 1.25rem;
  --c-type-section: 1.5rem;
  --c-type-article-section: 1.625rem;
  --c-type-page: clamp(2rem, 4vw, 3rem);
  --c-type-formula: 1.4rem;
  --c-line-body: 1.65;
  --c-line-reading: 1.7;
  --c-line-title: 1.25;
  --c-control-height: 44px;
  --c-search-height: 52px;
  --c-radius-field: 12px;
  --c-radius-card: 20px;
  --c-radius-chip: 8px;
  --c-radius-pill: 999px;
  --c-focus-width: 2px;
  --c-focus-offset: 3px;
  --c-row-gap: 24px;
  --c-meta-width: 210px;
  --c-thumb-width: 112px;
  --c-thumb-height: 88px;
  --c-figure-width: 280px;
  --c-figure-height: 220px;
  --c-metric-label-width: 84px;
  --c-metric-gap: 12px;
  --c-metric-padding: 11px;
  --c-ink-stroke: 1.8;
  --c-ink-stroke-fine: 1.2;
  --c-ink-stroke-emphasis: 2.6;
  --c-ink-label-size: 13px;
  margin: 0;
  background: var(--c-colour-bg);
  color: var(--c-colour-text);
  font-family: var(--font-sans);
  line-height: var(--c-line-body);
  -webkit-tap-highlight-color: var(--c-colour-bronze-soft);
}

html { color-scheme: light dark; scroll-behavior: auto; scroll-padding-top: 24px; }
html[data-resolved-theme='warm'] { color-scheme: light; }
html[data-resolved-theme='dark'] { color-scheme: dark; }
.community-page *, .community-page *::before, .community-page *::after { box-sizing: border-box; }
.community-page [hidden] { display: none !important; }
.community-page :is(main, section, article, aside, div, figure) { min-width: 0; }
.community-page :is(h1,h2,h3,p,figure) { margin: 0; }
.community-page :is(h1,h2,h3) { font-family: var(--font-display); font-weight: 600; line-height: var(--c-line-title); letter-spacing: -.02em; overflow-wrap: anywhere; }
.community-page a { color: inherit; text-decoration: none; touch-action: manipulation; }
button, input, select { font: inherit; color: inherit; touch-action: manipulation; }
.community-page button { cursor: pointer; }
.community-page img { display: block; max-width: 100%; }
.community-page :is(a,button,input,summary,[tabindex]):focus-visible { outline: var(--c-focus-width) solid var(--c-colour-text); outline-offset: var(--c-focus-offset); }
.community-page :is(a,button) { transition: color 120ms ease, background-color 120ms ease; }
.community-page .site-shell { min-height: 100dvh; }
.community-sr-only, .community-search-label { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link { position: fixed; z-index: 10; top: 8px; left: 8px; padding: 8px 16px; min-height: var(--c-control-height); background: var(--c-colour-bg-secondary); transform: translateY(-160%); }
.skip-link:focus { transform: none; }

/* Masthead, layout and reader-facing discovery. */
.community-masthead, .community-main, .footer-inner, .community-section-inner { width: min(calc(100% - 2 * var(--c-gutter)), var(--c-content-width)); margin-inline: auto; }
.community-masthead { min-height: 88px; display: flex; align-items: center; gap: var(--c-space-3); border-bottom: 1px solid var(--c-colour-border-medium); }
.brand { display: inline-flex; align-items: center; gap: 10px; min-height: var(--c-control-height); }
.brand-word { font-size: 22px; font-weight: 650; letter-spacing: -.6px; }
.community-return { display: inline-flex; align-items: center; min-height: var(--c-control-height); color: var(--c-colour-text-secondary); font-size: var(--c-type-meta); }
.community-return:hover, .back-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.community-main { padding-bottom: var(--c-space-5); }
.community-intro, .index-hero { padding-top: var(--c-space-4); }
.community-intro h1, .index-hero h1 { font-size: var(--c-type-page); line-height: 1.13; letter-spacing: -.035em; max-width: 24ch; }
.community-lede { max-width: var(--c-readable-width); margin-top: 12px !important; font-size: var(--c-type-reading); color: var(--c-colour-text-secondary); }
.community-search { position: relative; margin-top: var(--c-space-3); max-width: 760px; display: grid; grid-template-columns: minmax(0,1fr) auto; }
.community-search input { min-width: 0; width: 100%; min-height: var(--c-search-height); padding: 12px 16px; border: 1px solid var(--c-colour-border-strong); border-radius: var(--c-radius-field) 0 0 var(--c-radius-field); background: var(--c-colour-bg-secondary); font-size: var(--c-type-body); }
.community-search input::placeholder { color: var(--c-colour-text-secondary); opacity: 1; }
.community-search .c-button { min-width: 84px; border-left: 0; border-radius: 0 var(--c-radius-field) var(--c-radius-field) 0; background: var(--c-colour-bg-secondary); }
.community-filter-bar { display: flex; flex-wrap: wrap; gap: 4px; margin-top: var(--c-space-1); }
.c-button, .c-chip { display: inline-flex; align-items: center; justify-content: center; min-height: var(--c-control-height); font-size: var(--c-type-meta); line-height: 1.4; }
.c-button { padding: 10px 16px; border: 1px solid var(--c-colour-border-strong); border-radius: var(--c-radius-field); background: transparent; font-weight: 600; }
.c-chip { border: 0; border-radius: var(--c-radius-chip); padding: 0 12px; background: transparent; color: var(--c-colour-text-secondary); font-weight: 500; }
.c-button:hover, .c-chip:hover, .c-chip.is-active { background: var(--c-colour-accent-soft); color: var(--c-colour-text); }
.c-chip.is-active { font-weight: 600; }
.c-meta { font-size: var(--c-type-meta); color: var(--c-colour-text-secondary); font-weight: 400; line-height: 1.5; }
.c-arrow-link, .back-link { display: inline-flex; align-items: center; gap: var(--c-space-1); min-height: var(--c-control-height); background: none; border: 0; padding: 0; font-size: var(--c-type-meta); font-weight: 550; line-height: 1.4; }
.c-arrow-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.c-icon { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.community-section { margin-top: var(--c-space-5); }
.browse-section { margin-top: var(--c-space-4); }
.c-section-header { display: flex; align-items: center; justify-content: space-between; gap: var(--c-space-2); margin-bottom: var(--c-space-2); }
.c-section-header > div { min-width: 0; }
.c-section-header > a, .c-section-header > button { flex: none; }
.c-section-header h2, .method-panel h2 { font-size: var(--c-type-section); }
.c-section-header p { margin-top: 6px; font-size: var(--c-type-support); line-height: 1.5; max-width: 65ch; color: var(--c-colour-text-secondary); }

/* Full-width learning zones are confined to the hub. */
.community-hub { width: 100%; background: var(--c-colour-bg); }
.community-hub > .community-section { margin-top: 0; padding-block: var(--c-zone-padding); }
.community-hub > .community-opening { position: relative; isolation: isolate; overflow: hidden; padding-bottom: var(--c-opening-boundary-padding); }
.community-opening > .community-section-inner { position: relative; z-index: 1; }
.community-opening .community-intro { padding-top: var(--c-opening-title-space); }
.community-opening h1 { color: var(--c-hub-title); }
.community-opening-art { position: absolute; width: var(--c-opening-art-size); height: var(--c-opening-art-size); top: var(--c-opening-art-top); right: var(--c-opening-art-right); transform: rotate(-12deg); filter: blur(var(--c-opening-art-blur)); opacity: var(--c-opening-art-opacity); pointer-events: none; user-select: none; }
.community-brand-bar-1 { fill: var(--c-brand-bar-1); }
.community-brand-bar-2 { fill: var(--c-brand-bar-2); }
.community-brand-bar-3 { fill: var(--c-brand-bar-3); }
.community-brand-bar-4 { fill: var(--c-brand-bronze); opacity: .24; }
.community-hub > .browse-section { padding-top: var(--c-opening-boundary-padding); }
.community-hub > :is(.browse-section, .series-section) { background: var(--c-colour-bg-secondary); }
.community-hub > .path-section { background: var(--c-colour-accent-soft); }
.community-hub > .method-section { background: var(--c-method-surface); }
.community-hub .method-list li { border-bottom-color: var(--c-brand-bronze); }
.community-hub .method-panel { padding-top: 0; border-top: 0; }
.community-hub > .community-disclaimer { margin-top: 0; }

/* Stable article rows; static metadata is separate from interactive filters. */
.article-stream { border-top: 1px solid var(--c-colour-border-medium); }
.article-row { display: grid; grid-template-columns: var(--c-thumb-width) minmax(0,1fr) var(--c-meta-width); column-gap: var(--c-row-gap); row-gap: var(--c-space-1); align-items: start; padding-block: var(--c-space-3); border-bottom: 1px solid var(--c-colour-border-medium); }
.article-number { grid-column: 2; grid-row: 1; font-size: var(--c-type-small-label); color: var(--c-colour-text-secondary); font-weight: 500; letter-spacing: .03em; line-height: 1.4; }
.article-row .article-visual { grid-column: 1; grid-row: 1/3; align-self: center; width: var(--c-thumb-width); height: var(--c-thumb-height); }
.article-copy { grid-column: 2; grid-row: 2; }
.article-copy h3 { font-size: var(--c-type-row); line-height: 1.3; max-width: 48ch; }
.article-copy p { margin-top: var(--c-space-1); font-size: .9375rem; color: var(--c-colour-text-secondary); line-height: 1.6; max-width: 65ch; }
.article-row .article-meta { grid-column: 3; grid-row: 1/3; display: grid; grid-template-columns: auto auto; gap: 6px 12px; justify-content: start; }
.article-row .article-meta .c-meta:first-child { grid-column: 1/-1; font-weight: 500; }
.article-row:hover h3 { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.filter-summary { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--c-space-1); padding-block: 12px; margin-bottom: 12px; border-top: 1px solid var(--c-colour-border-medium); color: var(--c-colour-text-secondary); font-size: var(--c-type-meta); }
.filter-summary > div { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.filter-summary strong { font-weight: 600; color: var(--c-colour-text); }
.article-empty { display: grid; gap: var(--c-space-2); padding-block: 32px; }
.article-empty h3 { font-size: var(--c-type-section); }
.article-empty .c-button { justify-self: start; }

/* Paths retain one outer surface; metrics are flat, baseline-aligned rows. */
.path-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: var(--c-space-3); }
.path-card { display: flex; flex-direction: column; padding: var(--c-space-3); border: 1px solid var(--c-colour-border-medium); border-radius: var(--c-radius-card); background: var(--c-colour-bg-secondary); }
.article-topline, .series-row-label { font-size: var(--c-type-small-label); font-weight: 500; line-height: 1.5; letter-spacing: .03em; color: var(--c-colour-text-secondary); }
.article-topline { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--c-space-1); }
.path-card h3 { font-size: 22px; margin-top: 12px; }
.path-card > p { font-size: var(--c-type-support); line-height: 1.6; margin-top: 12px; color: var(--c-colour-text-secondary); }
.c-path-metrics { flex-grow: 1; margin: var(--c-space-2) 0 0; padding: 0; }
.c-path-metric { display: grid; grid-template-columns: var(--c-metric-label-width) minmax(0,1fr); align-items: baseline; gap: var(--c-metric-gap); padding-block: var(--c-metric-padding); }
.c-path-metric + .c-path-metric { border-top: 1px solid var(--c-colour-border); }
.c-path-metric dt { font-size: var(--c-type-small-label); font-weight: 600; color: var(--c-colour-text-secondary); text-transform: uppercase; letter-spacing: .8px; }
.c-path-metric dd { margin: 0; font-size: var(--c-type-support); font-weight: 500; color: var(--c-colour-text-secondary); overflow-wrap: anywhere; }
.path-card .c-button { align-self: start; margin-top: 20px; }
.series-index { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); column-gap: 32px; border-top: 1px solid var(--c-colour-border-medium); }
.series-row { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: start; gap: var(--c-space-3); padding-block: var(--c-space-3); border-bottom: 1px solid var(--c-colour-border-medium); }
.series-row h3 { margin-top: 8px; font-size: 21px; }
.series-row p { margin-top: 8px; font-size: .9375rem; line-height: 1.6; color: var(--c-colour-text-secondary); }
.series-row-meta { margin-top: 8px; }

/* Continuous article prose and a light supporting guide. */
.community-article-shell { display: grid; gap: var(--c-space-4); }
.community-article-header { display: grid; gap: var(--c-space-2); padding: 24px 0 32px; border-bottom: 1px solid var(--c-colour-border-medium); }
.community-article-header .back-link { justify-self: start; }
.community-article-header-grid { display: grid; grid-template-columns: minmax(0,1fr) var(--c-figure-width); align-items: center; gap: var(--c-space-4); }
.community-article-header h1 { font-size: var(--c-type-page); line-height: 1.13; letter-spacing: -.035em; margin-top: 12px; max-width: 24ch; }
.community-article-deck { font-size: var(--c-type-reading); line-height: 1.6; margin-top: var(--c-space-2) !important; color: var(--c-colour-text-secondary); }
.community-article-header .article-meta { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: var(--c-space-2); }
.article-section-label { display: block; font-size: var(--c-type-small-label); color: var(--c-colour-text-secondary); font-weight: 550; letter-spacing: .06em; line-height: 1.5; text-transform: uppercase; }
.community-article-layout { display: grid; grid-template-columns: minmax(0,760px) minmax(200px,1fr); gap: var(--c-space-5); align-items: start; }
.community-article-prose { grid-column: 1; grid-row: 1; display: grid; gap: 32px; }
.community-article-rail { grid-column: 2; grid-row: 1; display: grid; gap: var(--c-space-3); }
.article-body-section, .article-self-check, .article-application, .article-disclaimer, .article-formula-summary, .article-mini-series, .article-rail-card { display: grid; gap: 12px; padding-top: var(--c-space-3); border-top: 1px solid var(--c-colour-border-medium); }
.article-body-section:first-child, .article-rail-card:first-child { border-top: 0; padding-top: 0; }
.community-article-prose h2 { font-size: var(--c-type-article-section); }
.community-article-prose p { font-size: var(--c-type-reading); line-height: var(--c-line-reading); color: var(--c-colour-text-secondary); overflow-wrap: anywhere; }
.article-rail-card h2 { font-size: 18px; line-height: 1.4; font-weight: 550; }
.article-term-list { display: flex; flex-wrap: wrap; gap: 8px 12px; }
.article-related-list, .article-source-list, .article-child-list { display: grid; }
.article-related-item, .article-child-link { display: grid; gap: 4px; padding-block: 12px; min-height: var(--c-control-height); border-top: 1px solid var(--c-colour-border); }
.article-related-item:first-child, .article-child-link:first-child { border-top: 0; }
.article-related-item span, .article-child-link > span { font-size: var(--c-type-small-label); color: var(--c-colour-text-secondary); }
.article-related-item strong { font-size: .9375rem; font-weight: 550; line-height: 1.4; }
.article-child-link strong { font-size: var(--c-type-row); line-height: 1.4; font-weight: 550; }
.article-related-item:hover strong, .article-child-link:hover strong { text-decoration: underline; text-underline-offset: 4px; }
.article-source-list { list-style: none; margin: 0; padding: 0; }
.article-source-list a { display: block; min-height: var(--c-control-height); padding-block: 10px; font-size: var(--c-type-support); line-height: 1.5; overflow-wrap: anywhere; color: var(--c-colour-text-secondary); text-decoration: underline; text-underline-offset: 3px; }
.article-navigation { display: grid; grid-template-columns: 1fr 1fr; gap: var(--c-space-3); border-top: 1px solid var(--c-colour-border-medium); padding-top: var(--c-space-3); }
.article-navigation .c-button { display: flex; flex-direction: column; align-items: start; justify-content: start; gap: 8px; padding: 8px 0; border: 0; border-radius: 0; text-align: left; }
.article-navigation .c-button span { color: var(--c-colour-text-secondary); font-size: var(--c-type-meta); font-weight: 400; }
.article-navigation .c-button strong { font-size: 18px; font-weight: 550; line-height: 1.4; }
.article-navigation .c-button:hover { background: none; text-decoration: underline; text-underline-offset: 4px; }
.article-error { display: grid; gap: var(--c-space-2); padding-block: var(--c-space-4); }

/* Maths retains native semantics; only genuinely wide expressions scroll. */
.article-inset { border-left: 1px solid var(--c-colour-border-strong); padding-left: 20px; }
.article-formula { display: grid; gap: 14px; margin: 0; }
.article-formula-stack { display: grid; gap: var(--c-space-3); }
.article-formula-expression { min-width: 0; max-width: 100%; padding-block: 12px; overflow-x: auto; overscroll-behavior-x: contain; scrollbar-width: thin; scrollbar-color: var(--c-colour-border-strong) transparent; }
.article-formula-expression.is-scrollable { border-bottom: 1px dashed var(--c-colour-border-strong); }
.article-formula-math { min-width: max-content; }
.article-formula math, .article-formula-text, .article-formula-variable dt { font-family: var(--font-math); font-weight: 400; }
.article-formula math, .article-formula-text { font-size: var(--c-type-formula); color: var(--c-colour-text); }
.article-formula-text { white-space: nowrap; }
.article-formula-variable-list { display: grid; margin: 0; }
.article-formula-variable { display: grid; grid-template-columns: 80px minmax(0,1fr); gap: 14px; padding-block: 14px; border-top: 1px solid var(--c-colour-border); }
.article-formula-variable:first-child { padding-top: 0; border-top: 0; }
.article-formula-variable dt math { font-size: inherit; }
.article-formula-variable dt { font-size: var(--c-type-reading); line-height: 1.4; }
.article-formula-variable dd { margin: 0; }
.article-formula-variable dd, .community-article-prose .article-formula-note { font-size: var(--c-type-support); line-height: 1.5; color: var(--c-colour-text-secondary); }
.article-formula-note { padding-top: 8px; border-top: 1px solid var(--c-colour-border); }
.article-example-table { border-collapse: collapse; width: 100%; font-size: .9375rem; line-height: 1.6; color: var(--c-colour-text-secondary); }
.article-example-table tr + tr { border-top: 1px solid var(--c-colour-border); }
.article-example-table th, .article-example-table td { padding-block: 14px; vertical-align: top; overflow-wrap: anywhere; }
.article-example-table th { width: 42%; padding-right: 20px; font-weight: 500; text-align: left; }
.article-example-table td { font-weight: 400; text-align: left; }
.article-example-table.is-quantitative td { text-align: right; font-variant-numeric: tabular-nums; }
summary { position: relative; min-height: var(--c-control-height); list-style: none; padding: 16px 32px 16px 0; font-size: var(--c-type-body); line-height: 1.5; font-weight: 550; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
summary::after { content: ''; position: absolute; top: 21px; right: 6px; width: 8px; height: 8px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg); }
details[open] > summary::after { transform: rotate(225deg); top: 25px; }
.article-self-check-list details + details { border-top: 1px solid var(--c-colour-border); }
.article-self-check-list details > p { padding-bottom: 16px; }
.article-derivation { padding-top: var(--c-space-3); border-top: 1px solid var(--c-colour-border-medium); }
.article-derivation summary > span { display: grid; gap: 8px; }
.article-derivation summary strong { font-size: 22px; font-weight: 600; line-height: 1.3; }
.article-derivation-content { display: grid; gap: var(--c-space-2); padding-top: var(--c-space-2); }
.article-derivation-list { list-style: none; margin: 0; padding: 0; }
.article-derivation-step { display: grid; grid-template-columns: 36px minmax(0,1fr); gap: 14px; padding-block: var(--c-space-3); border-top: 1px solid var(--c-colour-border); }
.article-derivation-count { font-size: var(--c-type-small-label); font-weight: 550; }
.article-derivation-copy { display: grid; gap: 12px; }
.article-derivation-copy h3 { font-size: 19px; line-height: 1.35; }

/* Concept illustrations: existing geometry, palette and optical stroke weights. */
.article-visual { position: relative; }
.article-visual span { position: absolute; }
.article-visual-ink { display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ink-illustration { display: block; width: 100%; height: auto; max-height: var(--c-figure-height); fill: none; stroke-linecap: round; stroke-linejoin: round; stroke-width: var(--c-ink-stroke); }
.article-visual-feature { width: 100%; }
.article-visual-compact .ink-illustration { --c-ink-stroke: 3.6; --c-ink-stroke-fine: 2.4; --c-ink-stroke-emphasis: 4.6; height: 100%; }
.ink-paper { fill: var(--c-colour-bg-secondary); stroke: var(--c-colour-text-secondary); }
.ink-stroke { stroke: var(--c-colour-text-secondary); }
.ink-rule, .ink-hatch { stroke: var(--c-colour-text-tertiary); stroke-width: var(--c-ink-stroke-fine); }
.ink-wash { fill: var(--c-colour-accent-soft); }
.ink-accent-wash { fill: var(--c-colour-bronze-soft); }
.ink-accent { stroke: var(--c-colour-bronze); }
.ink-fine { stroke-width: var(--c-ink-stroke-fine); }
.ink-curve { stroke-width: var(--c-ink-stroke-emphasis); }
.ink-contact { fill: var(--c-colour-bronze); stroke: var(--c-colour-bg-secondary); }
.ink-label { fill: var(--c-colour-text-secondary); font-family: var(--font-display); font-size: var(--c-ink-label-size); }
.ink-caption { max-width: 100%; font-size: var(--c-type-small-label); color: var(--c-colour-text-secondary); line-height: 1.5; text-align: center; }

/* Supporting explanation and contextual product links. */
.method-panel { display: grid; grid-template-columns: 1fr 1fr; gap: var(--c-space-3); padding-top: var(--c-space-3); border-top: 1px solid var(--c-colour-border-medium); }
.method-panel > div > p { margin-top: 12px; font-size: var(--c-type-support); color: var(--c-colour-text-secondary); }
.method-list { list-style: none; margin: 0; padding: 0; }
.method-list li { display: grid; grid-template-columns: 132px minmax(0,1fr); gap: var(--c-space-2); padding-block: 14px; font-size: var(--c-type-support); border-bottom: 1px solid var(--c-colour-border); }
.method-list li:first-child { padding-top: 0; }
.method-list strong { font-weight: 550; }
.method-list span { color: var(--c-colour-text-secondary); }
.bridge-list { display: grid; }
.bridge-row { display: grid; grid-template-columns: 110px 240px minmax(0,1fr); gap: var(--c-space-3); align-items: center; padding-block: 20px; border-top: 1px solid var(--c-colour-border-medium); }
.bridge-row strong { font-size: var(--c-type-reading); font-weight: 600; }
.bridge-row > span:last-child { font-size: var(--c-type-support); color: var(--c-colour-text-secondary); }
.bridge-row:hover strong { text-decoration: underline; text-underline-offset: 4px; }
.community-disclaimer { margin-top: 48px; font-size: var(--c-type-meta); color: var(--c-colour-text-secondary); }
.site-footer { border-top: 1px solid var(--c-colour-border-medium); padding-block: 32px; }
.footer-copy strong { font-size: var(--c-type-support); font-weight: 600; }
.footer-copy p { font-size: var(--c-type-meta); margin-top: 8px; color: var(--c-colour-text-secondary); }
.footer-links a { color: var(--c-colour-text-secondary); }
.footer-links a:hover { text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 1000px) {
  .community-page { --c-opening-title-space: 96px; --c-opening-art-size: 560px; --c-opening-art-top: -144px; }
  .community-page { --c-gutter: 24px; --c-meta-width: 170px; --c-thumb-width: 88px; --c-row-gap: 20px; --c-figure-width: 220px; }
  .path-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .community-article-header-grid { gap: var(--c-space-3); }
  .community-article-layout { grid-template-columns: minmax(0,1fr); gap: var(--c-space-4); }
  .community-article-rail { grid-column: 1; grid-row: 2; grid-template-columns: 1fr 1fr; }
  .bridge-row { grid-template-columns: 110px 220px minmax(0,1fr); gap: var(--c-space-2); }
}
@media (max-width: 600px) {
  .community-page { --c-opening-title-space: 88px; --c-opening-art-size: 380px; --c-opening-art-top: -65px; --c-opening-art-right: -150px; --c-opening-art-blur: 5px; --c-opening-art-opacity: .6; }
  .community-page { --c-zone-padding: 40px; --c-opening-boundary-padding: 20px; --c-gutter: 20px; --c-space-4: 28px; --c-space-5: 44px; --c-type-reading: 1rem; --c-type-meta: .75rem; --c-type-page: 2rem; --c-type-row: 1.125rem; --c-type-section: 1.3125rem; --c-type-article-section: 1.4375rem; --c-thumb-width: 72px; --c-thumb-height: 64px; --c-row-gap: 16px; --c-figure-width: 260px; --c-figure-height: 140px; --c-ink-label-size: 18px; }
  .community-masthead { min-height: 72px; padding-block: 8px; gap: 12px; flex-wrap: wrap; }
  .brand { gap: 6px; }
  .brand img { width: 24px; height: 24px; }
  .brand-word { font-size: 20px; }
  .theme-segment-button { font-size: 11px; }
  .community-search { margin-top: 20px; }
  .community-filter-bar { gap: 0; }
  .c-chip { padding-inline: 10px; }
  .c-section-header { flex-wrap: wrap; gap: var(--c-space-1); margin-bottom: 12px; }
  .c-section-header > div { flex: 1; min-width: 170px; }
  .c-section-header p { font-size: var(--c-type-meta); margin-top: 4px; }
  .article-row { grid-template-columns: minmax(0,1fr) var(--c-thumb-width); column-gap: 12px; padding-block: 20px; }
  .article-number { grid-column: 1; grid-row: 1; font-size: 11px; }
  .article-copy { grid-column: 1; grid-row: 2; }
  .article-copy p { font-size: var(--c-type-support); }
  .article-row .article-visual { grid-column: 2; grid-row: 1/3; align-self: start; margin-top: 20px; }
  .article-row .article-meta { grid-column: 1/-1; grid-row: 3; grid-template-columns: minmax(0,1fr) auto auto; gap: 12px; margin-top: 4px; }
  .article-row .article-meta .c-meta:first-child { grid-column: auto; }
  .path-grid, .series-index, .method-panel { grid-template-columns: 1fr; }
  .path-card { padding: 20px; }
  .series-row { gap: 12px; }
  .series-row h3 { font-size: 19px; }
  .series-row p { font-size: var(--c-type-support); }
  .community-article-header { padding: 16px 0 24px; gap: 8px; }
  .community-article-header-grid { grid-template-columns: minmax(0,1fr); gap: 12px; }
  .community-article-header h1 { margin-top: 8px; }
  .community-article-header .article-topline span:last-child { display: none; }
  .community-article-header .article-visual { max-width: var(--c-figure-width); justify-self: center; }
  .article-visual-feature .ink-illustration { height: var(--c-figure-height); }
  .ink-caption { font-size: 11px; }
  .community-article-shell { gap: 28px; }
  .community-article-rail, .article-navigation { grid-template-columns: minmax(0,1fr); }
  .article-example-table { font-size: var(--c-type-support); }
  .article-example-table th { padding-right: 12px; }
  .article-inset { padding-left: 12px; }
  .article-derivation-step { grid-template-columns: minmax(0,1fr); gap: 8px; }
  .method-list li { grid-template-columns: 100px minmax(0,1fr); }
  .bridge-row { grid-template-columns: minmax(0,1fr); gap: 8px; }
}
@media (max-width: 359px) {
  .community-page { --c-gutter: 16px; }
  .community-return { order: 3; width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .community-page *, .community-page *::before, .community-page *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* Legacy concept geometry for optional illustration fallback. */
.visual-axis {
  left: 16%;
  right: 14%;
  bottom: 28%;
  height: 1px;
  background: var(--c-colour-visual-line-soft);
}

.visual-line {
  left: 19%;
  right: 17%;
  top: 43%;
  height: 34%;
  border-top: 2px solid var(--c-colour-visual-line);
  border-right: 2px solid var(--c-colour-visual-line);
  border-radius: var(--c-radius-pill) var(--c-radius-pill) 0 0;
  transform: rotate(-10deg);
}

.article-visual-yield-curve .visual-line {
  top: 38%;
  height: 22%;
  border-right: 0;
  border-radius: var(--c-radius-pill);
  transform: rotate(-4deg);
}

.article-visual-option-payoff .visual-line {
  left: 22%;
  right: auto;
  top: 38%;
  width: 58%;
  height: 34%;
  border-top: 0;
  border-right: 0;
  border-left: 2px solid var(--c-colour-visual-line);
  border-bottom: 2px solid var(--c-colour-visual-line);
  border-radius: 0;
  transform: skewX(-28deg);
}

.visual-dot,
.visual-point {
  width: 8px;
  height: 8px;
  border-radius: var(--c-radius-pill);
  background: var(--c-colour-visual-bronze);
}

.visual-dot {
  right: 16%;
  top: 34%;
}

.visual-blocks {
  inset: 18%;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--c-space-1);
}

.visual-blocks span {
  position: static;
  border-radius: var(--c-radius-field);
  background: var(--c-colour-visual-line-soft);
}

.visual-blocks span:nth-child(2),
.visual-blocks span:nth-child(4),
.visual-blocks span:nth-child(6) {
  background: var(--c-colour-visual-bronze);
}

.visual-bars {
  inset: 18% 20%;
  display: flex;
  gap: var(--c-space-1);
  align-items: flex-end;
}

.visual-bars span {
  position: static;
  flex: 1;
  border-radius: var(--c-radius-pill) var(--c-radius-pill) 0 0;
  background: var(--c-colour-visual-line);
}

.visual-bars span:nth-child(1) {
  height: 48%;
}

.visual-bars span:nth-child(2) {
  height: 72%;
  background: var(--c-colour-visual-bronze);
}

.visual-bars span:nth-child(3) {
  height: 38%;
}

.visual-bars span:nth-child(4) {
  height: 88%;
  background: var(--c-colour-visual-bronze);
}

.visual-quadrant {
  inset: 20%;
  border-left: 1px solid var(--c-colour-visual-line-soft);
  border-bottom: 1px solid var(--c-colour-visual-line-soft);
}

.visual-quadrant::before,
.visual-quadrant::after {
  content: "";
  position: absolute;
  background: var(--c-colour-visual-line-soft);
}

.visual-quadrant::before {
  left: 0;
  right: 0;
  top: 48%;
  height: 1px;
}

.visual-quadrant::after {
  top: 0;
  bottom: 0;
  left: 52%;
  width: 1px;
}

.visual-point-a {
  left: 62%;
  top: 34%;
}

.visual-point-b {
  left: 38%;
  top: 58%;
  background: var(--c-colour-visual-line);
}

/* Locale support: language-specific typography, without changing English layout. */
.community-page:lang(zh-Hans) { --c-line-body: 1.8; --c-line-reading: 1.85; }
.community-page:lang(zh-Hans) :is(h1,h2,h3) { letter-spacing: 0; }
.c-language-note { font-size: var(--c-type-meta); font-weight: 400; color: var(--c-colour-text-secondary); white-space: nowrap; }
.community-locale-review { max-width: 1160px; margin: 12px auto 0; padding: 0 var(--c-gutter); display: flex; align-items: center; justify-content: space-between; gap: 12px; font-size: var(--c-type-meta); color: var(--c-colour-text-secondary); }
.community-locale-review a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: underline; flex: none; }
.community-page:lang(zh-Hans) h1 { text-wrap: balance; }

/* Translated variable explanations must fit compact definition columns. */
.community-page:not(:lang(en)) .article-formula-variable dd {
  hyphens: auto;
  overflow-wrap: anywhere;
}
.community-page:lang(zh-Hans) .community-lede { text-wrap: balance; }