/* TASK-1217: Knowledge in Motion. Marketing-only; no application token overrides. */
.km-benchmark, .km-header {
  --km-paper: color-mix(in srgb, var(--color-accent) 2%, var(--color-card));
  --km-white: var(--color-card);
  --km-ink: var(--color-foreground);
  --km-muted: var(--color-muted-foreground);
  --km-faint: var(--color-faint-foreground);
  --km-line: var(--color-border);
  --km-action: var(--color-action);
  --km-on-action: var(--color-on-action);
  --km-signal: var(--color-accent);
  --km-soft: var(--surface-accent-4);
  --km-selected: var(--surface-accent-8);
  --km-night: var(--color-on-accent);
  --km-night-text: var(--color-card);
  --km-night-muted: color-mix(in srgb, var(--color-card) 72%, var(--color-on-accent));
  --km-night-line: color-mix(in srgb, var(--color-card) 16%, transparent);
  --km-light: color-mix(in srgb, var(--color-accent) 16%, transparent);
  --km-shadow: color-mix(in srgb, var(--color-on-accent) 25%, transparent);
  --km-window-shadow: 0 24px 72px var(--km-shadow), 0 2px 8px var(--km-shadow);
  --km-type-display: 6rem;
  --km-type-frame: 3.375rem;
  --km-type-story: 3.5rem;
  --km-type-reading: 1.0625rem;
  --km-type-body: 1rem;
  --km-type-label: .875rem;
  --km-type-meta: .75rem;
}
.km-header { background: var(--km-paper); }
.km-header .site-header { width: min(calc(100% - 80px), 1280px); }
.km-header .brand img { height: 32px; }
.km-header .primary-nav a, .km-header .language-nav a { font-size: var(--km-type-label); padding-inline: 10px; }
.km-skip-link:not(:focus) { clip-path: inset(50%); }
.km-benchmark { background: var(--km-paper); color: var(--km-ink); font-size: var(--km-type-body); line-height: 1.6; }
.km-benchmark * { min-width: 0; }
.km-container { width: min(calc(100% - 80px), 1280px); margin-inline: auto; }
.km-eyebrow { color: var(--km-muted); font-size: var(--km-type-meta); font-weight: 600; line-height: 1.5; letter-spacing: .13em; }
.km-hero { position: relative; padding: 78px 0 52px; isolation: isolate; overflow: visible; background: var(--km-night); color: var(--km-night-text); }
.km-hero::before { content: ''; position: absolute; z-index: -1; inset: 0; background: radial-gradient(ellipse at 85% 64%, var(--km-light), transparent 48%); pointer-events: none; }
.km-hero .km-container { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.3fr); gap: 64px; align-items: start; }
.km-editorial { padding-top: 0; }
.km-brand-line { margin-bottom: 32px; padding-left: 18px; border-left: 2px solid var(--km-signal); }
.km-hero .km-eyebrow { color: var(--km-night-muted); }
.km-title { margin: 0; color: var(--km-night-text); font-weight: 600; letter-spacing: -.045em; text-wrap: initial; }
.km-title-opening { display: block; font-size: var(--km-type-frame); line-height: 1.1; }
.km-title-name { display: block; margin-top: 10px; font-size: var(--km-type-display); line-height: 1.05; letter-spacing: -.065em; }
.km-title-ending { display: block; margin: 10px 0 0 66px; font-size: var(--km-type-frame); line-height: 1.1; }
.km-title:lang(zh) { letter-spacing: -.015em; }
.km-title:lang(zh) .km-title-opening { font-size: 2.875rem; }
.km-title:lang(zh) .km-title-ending { font-size: 3rem; }
.km-lead { margin: 38px 0 0 66px; }
.km-summary { max-width: 330px; font-size: var(--km-type-body); line-height: 1.75; color: var(--km-night-muted); }
.km-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; margin-top: 28px; }
.km-download { display: inline-flex; align-items: center; justify-content: center; gap: 28px; min-height: 52px; padding: 12px 20px; border-radius: 4px; background: var(--km-signal); color: var(--km-night); font-size: var(--km-type-body); font-weight: 700; text-decoration: none; }
.km-download:hover { background: var(--color-on-primary); }
.km-arrow { width: 20px; height: 20px; flex: 0 0 auto; }
.km-ghost { display: inline-flex; gap: 12px; align-items: center; min-height: 44px; font-size: var(--km-type-label); font-weight: 600; color: var(--km-night-text); text-decoration: none; }
.km-ghost:hover { text-decoration: underline; }
.km-benchmark a:focus-visible { outline: 3px solid var(--km-action); outline-offset: 4px; }
.km-hero .km-ghost:focus-visible, .km-download:focus-visible { outline-color: var(--km-signal); }
.km-product { position: relative; margin: 30px 0 0; color: var(--km-ink); }
.km-stage { position: relative; padding: 0; }
.km-stage-lines { display: none; }
.km-workspace { position: relative; background: var(--km-white); border: 1px solid var(--km-line); border-radius: 8px; box-shadow: var(--km-window-shadow); }
.km-titlebar { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; min-height: 36px; padding: 6px 14px; border-bottom: 1px solid var(--km-line); border-radius: 8px 8px 0 0; background: var(--km-soft); color: var(--km-muted); font-size: var(--km-type-meta); font-weight: 600; }
.km-window-dots { display: flex; align-items: center; gap: 6px; }
.km-window-dots i { width: 7px; height: 7px; border-radius: 50%; border: 1px solid var(--km-line); }
.km-saved { justify-self: end; font-weight: 400; }
.km-sidebar { display: none; }
.km-context { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 24px; border-bottom: 1px solid var(--km-line); font-size: var(--km-type-label); }
.km-context > div { display: flex; flex-direction: column; gap: 3px; }
.km-context span { color: var(--km-muted); }
.km-tab-label { border-bottom: 2px solid var(--km-signal); align-self: stretch; display: flex; align-items: center; font-weight: 600; }
.km-column-headings { display: grid; grid-template-columns: 1fr 1.05fr; gap: 24px; padding: 20px 24px 10px 64px; color: var(--km-muted); font-size: var(--km-type-meta); }
.km-transcript-row { display: grid; grid-template-columns: 28px minmax(0, 1fr) minmax(0, 1.05fr); gap: 0 16px; position: relative; margin: 0 12px; padding: 18px 12px; font-size: var(--km-type-reading); line-height: 1.65; }
.km-time, .km-mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.km-time { padding-top: 4px; font-size: var(--km-type-meta); color: var(--km-faint); }
.km-original { color: var(--km-ink); }
.km-translation { color: var(--km-ink); }
.km-inline-label { display: none; }
.km-prior { display: none; }
.km-selected { margin-bottom: 18px; border-left: 2px solid var(--km-signal); background: var(--km-selected); }
.km-selected .km-translation { font-size: 1.375rem; font-weight: 600; line-height: 1.65; }
.km-bookmark-label { grid-column: 2 / -1; display: flex; gap: 6px; align-items: center; margin-top: 14px; font-size: var(--km-type-meta); color: var(--km-muted); }
.km-bookmark { width: 14px; height: 14px; color: var(--km-action); }
.km-hero-trace { position: relative; width: 2px; height: 38px; margin-left: 13px; pointer-events: none; overflow: visible; }
.km-hero-trace path { stroke: var(--km-signal); stroke-width: 1.5; }
.km-hero-trace circle { fill: var(--km-signal); }
.km-trace-progress { display: none; }
.km-floating-note { position: relative; width: 86%; margin: 0 0 0 -48px; padding: 20px 28px 12px; border-top: 2px solid var(--km-signal); background: var(--km-white); box-shadow: var(--km-window-shadow); border-radius: 2px; }
.km-note-meta { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 10px; color: var(--km-muted); font-size: var(--km-type-meta); font-weight: 600; letter-spacing: .07em; text-transform: uppercase; }
.km-note-meta > span:first-child { color: var(--km-action); }
.km-note-heading { margin: 0 0 10px; font-size: 1.375rem; font-weight: 600; line-height: 1.4; letter-spacing: -.025em; }
.km-floating-note > p { font-size: var(--km-type-body); line-height: 1.65; }
.km-source-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; color: var(--km-action); font-size: var(--km-type-label); font-weight: 600; text-decoration: underline; }
.km-mini-link { margin-top: 2px; }
.km-mini-link .km-arrow { width: 16px; height: 16px; }
.km-caption { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px 20px; margin-top: 28px; padding-top: 12px; border-top: 1px solid var(--km-night-line); color: var(--km-night-muted); font-size: var(--km-type-meta); }

/* Capture is an opened source record: a continuous margin, not two equal cards. */
.km-capture { position: relative; padding: 112px 0 96px; scroll-margin-top: 28px; }
.km-capture::before { content: ''; position: absolute; left: max(40px, calc((100% - 1280px) / 2)); top: 0; height: 64px; width: 1px; background: var(--km-signal); }
.km-story-intro { display: grid; grid-template-columns: 1.2fr 1fr; gap: 96px; align-items: end; margin: 0 0 60px; }
.km-story-intro .km-eyebrow { color: var(--km-action); margin-bottom: 24px; }
.km-story-title { font-size: var(--km-type-story); line-height: 1.12; font-weight: 600; letter-spacing: -.04em; text-wrap: initial; }
.km-story-title:lang(zh) { line-height: 1.25; letter-spacing: -.025em; }
.km-story-lead { max-width: 430px; font-size: var(--km-type-reading); color: var(--km-muted); }
.km-organize-link { display: inline-flex; align-items: center; gap: 16px; min-height: 48px; margin-top: 20px; color: var(--km-action); font-size: var(--km-type-body); font-weight: 600; text-decoration: underline; }
.km-evidence-pair { display: grid; grid-template-columns: minmax(0, .95fr) 96px minmax(0, 1.05fr); align-items: center; }
.km-source-surface { border-block: 1px solid var(--km-line); }
.km-surface-heading { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; min-height: 64px; padding: 16px 24px; border-bottom: 1px solid var(--km-line); }
.km-surface-heading h3 { font-size: var(--km-type-body); font-weight: 600; letter-spacing: 0; }
.km-surface-heading > .km-time { margin-left: auto; }
.km-step { color: var(--km-action); font-family: var(--font-mono); font-size: var(--km-type-label); }
.km-source-context { padding: 22px 24px 0; color: var(--km-muted); font-size: var(--km-type-label); }
.km-source-quote { margin: 22px 24px 28px; padding-left: 20px; border-left: 2px solid var(--km-signal); scroll-margin-block: 48px; }
.km-reading-label { color: var(--km-muted); font-size: var(--km-type-meta); font-weight: 600; }
.km-source-quote blockquote { margin: 8px 0 24px; font-size: var(--km-type-reading); line-height: 1.75; }
.km-source-quote > .km-translation { margin-top: 10px; font-size: 1.375rem; font-weight: 600; line-height: 1.6; text-wrap: balance; line-break: strict; }
.km-source-quote:target, .km-source-quote:focus-visible { outline: 3px solid var(--km-action); outline-offset: 8px; }
.km-source-quote:target blockquote { text-decoration: underline; text-decoration-color: var(--km-action); text-underline-offset: 5px; }
.km-connection { display: flex; align-items: center; color: var(--km-action); }
.km-connection > span { height: 1px; flex: 1; background: var(--km-signal); }
.km-connection > svg { transform: rotate(45deg); width: 20px; height: 20px; }
.km-note-surface { background: var(--km-white); border: 1px solid var(--km-line); border-top: 2px solid var(--km-signal); box-shadow: var(--elevation-2); scroll-margin-block: 48px; }
.km-note-surface:target, .km-note-surface:focus-visible { outline: 3px solid var(--km-action); outline-offset: 6px; }
.km-note-content { padding: 28px; }
.km-provenance { display: inline-block; margin-bottom: 16px; color: var(--km-muted); font-size: var(--km-type-label); }
.km-note-content .km-note-heading { font-size: 1.75rem; }
.km-note-content > p { font-size: var(--km-type-reading); line-height: 1.75; }
.km-note-footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 16px; padding: 12px 28px; border-top: 1px solid var(--km-line); color: var(--km-muted); font-size: var(--km-type-label); }
.km-closing { margin-top: 32px; color: var(--km-muted); font-size: var(--km-type-label); }

/* Scroll carries the selected passage toward its note; the complete still stays visible. */
@supports (animation-timeline: view()) and (timeline-scope: --km-product) {
  @media (prefers-reduced-motion: no-preference) and (min-width: 901px) {
    .km-benchmark[data-motion="on"] { timeline-scope: --km-product; }
    .km-benchmark[data-motion="on"] .km-hero { view-timeline: --km-product block; }
    .km-benchmark[data-motion="on"] .km-hero-trace path:not(.km-trace-progress) {
      stroke: color-mix(in srgb, var(--km-signal) 35%, var(--km-night));
    }
    .km-benchmark[data-motion="on"] .km-trace-progress {
      display: block;
      stroke: var(--km-signal);
      stroke-width: 2;
      stroke-dasharray: 1;
      animation: km-carry-source linear both;
      animation-timeline: --km-product;
      animation-range: entry 90% exit 55%;
    }
    .km-benchmark[data-motion="on"] .km-floating-note {
      animation: km-note-settle linear both;
      animation-timeline: --km-product;
      animation-range: entry 90% exit 55%;
    }
  }
}
@keyframes km-carry-source { from { stroke-dashoffset: 1; } to { stroke-dashoffset: 0; } }
@keyframes km-note-settle { from { translate: 0 0; } to { translate: 0 -8px; } }

@media (max-width: 1199px) {
  .km-container, .km-header .site-header { width: calc(100% - 64px); }
  .km-header .site-header { flex-direction: row; align-items: center; }
  .km-header .nav-cluster { width: auto; justify-content: flex-end; }
  .km-header .primary-nav a { padding-inline: 8px; }
  .km-hero { padding-top: 64px; }
  .km-hero .km-container { grid-template-columns: minmax(0, .82fr) minmax(0, 1.18fr); gap: 40px; }
  .km-benchmark { --km-type-display: 4.5rem; --km-type-frame: 2.625rem; --km-type-story: 2.75rem; }
  .km-title:lang(zh) .km-title-opening { font-size: 2.125rem; }
  .km-title:lang(zh) .km-title-ending { font-size: 2.5rem; }
  .km-title-ending, .km-lead { margin-left: 32px; }
  .km-product { margin-top: 20px; }
  .km-column-headings { padding-left: 24px; gap: 16px; }
  .km-transcript-row { grid-template-columns: 1fr 1fr; gap: 8px 16px; }
  .km-selected > .km-time { grid-column: 1 / -1; }
  .km-selected .km-translation { font-size: 1.125rem; }
  .km-bookmark-label { grid-column: 1 / -1; }
  .km-floating-note { width: 94%; margin-left: -20px; padding-inline: 22px; }
  .km-story-intro { gap: 48px; }
  .km-evidence-pair { grid-template-columns: minmax(0, 1fr) 48px minmax(0, 1fr); }
}
@media (max-width: 900px) {
  .km-header .site-header { display: grid; grid-template-columns: auto 1fr; gap: 4px 24px; padding-block: 8px; }
  .km-header .nav-cluster { display: contents; }
  .km-header .language-switcher { grid-column: 2; grid-row: 1; justify-self: end; }
  .km-header .primary-nav { grid-column: 1 / -1; grid-row: 2; justify-content: space-between; width: 100%; }
  .km-header .nav-cluster > .button { display: none; }
  .km-hero .km-container { grid-template-columns: 1fr; gap: 40px; }
  .km-editorial { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: end; }
  .km-title-ending { margin-left: 0; }
  .km-lead { margin: 0; }
  .km-product { margin: 0 0 0 40px; }
  .km-selected .km-translation { font-size: 1.5rem; }
  .km-story-intro { gap: 32px; }
}
@media (max-width: 599px) {
  .km-container, .km-header .site-header { width: calc(100% - 40px); }
  .km-header .site-header { column-gap: 8px; }
  .km-header .brand img { height: 27px; }
  .km-header .language-nav { gap: 0; }
  .km-header .language-nav a { padding-inline: 8px; }
  .km-header .primary-nav { gap: 4px; }
  .km-header .primary-nav a { padding-inline: 4px; font-size: var(--km-type-label); }
  .km-hero { padding: 40px 0 32px; }
  .km-hero .km-container { gap: 36px; }
  .km-editorial { display: block; }
  .km-brand-line { margin-bottom: 26px; padding-left: 12px; }
  .km-benchmark { --km-type-display: 4.625rem; --km-type-frame: 2.375rem; --km-type-story: 2.375rem; }
  .km-title-name { margin-top: 6px; }
  .km-title-ending { margin: 6px 0 0 50px; }
  .km-title:lang(zh) .km-title-opening { font-size: 2rem; }
  .km-title:lang(zh) .km-title-ending { font-size: 2.375rem; }
  .km-lead { margin: 28px 0 0; }
  .km-summary { max-width: 330px; line-height: 1.65; }
  .km-actions { margin-top: 24px; gap: 12px 20px; }
  .km-download { gap: 20px; min-height: 48px; padding-inline: 16px; }
  .km-product { margin: 0; }
  .km-titlebar { min-height: 34px; }
  .km-saved { display: none; }
  .km-context { padding: 12px 16px; min-height: 64px; }
  .km-tab-label { display: none; }
  .km-column-headings { display: none; }
  .km-inline-label { display: block; margin-bottom: 6px; color: var(--km-muted); font-size: var(--km-type-meta); font-weight: 400; line-height: 1.5; }
  .km-transcript-row { grid-template-columns: 1fr; margin: 10px; gap: 12px; padding: 14px; font-size: var(--km-type-body); }
  .km-selected .km-translation { border-top: 1px solid var(--km-line); padding-top: 12px; font-size: 1.25rem; }
  .km-bookmark-label { margin-top: 0; }
  .km-hero-trace { display: none; }
  .km-floating-note { width: auto; margin: 32px 0 0 24px; padding: 18px 20px 12px; }
  .km-floating-note::before { content: ''; position: absolute; left: 20px; bottom: calc(100% + 2px); height: 32px; width: 1px; background: var(--km-signal); }
  .km-note-heading { font-size: 1.25rem; }
  .km-caption { margin-top: 24px; }
  .km-caption > span:last-child { display: none; }
  .km-capture { padding: 88px 0 64px; }
  .km-capture::before { left: 20px; height: 48px; }
  .km-story-intro { grid-template-columns: 1fr; gap: 24px; margin-bottom: 36px; }
  .km-story-intro .km-eyebrow { margin-bottom: 16px; }
  .km-story-lead { font-size: var(--km-type-body); }
  .km-organize-link { margin-top: 12px; }
  .km-evidence-pair { grid-template-columns: 1fr; }
  .km-surface-heading { padding-inline: 16px; }
  .km-source-context { padding-inline: 16px; }
  .km-source-quote { margin-inline: 16px; padding-left: 14px; }
  .km-source-quote blockquote { font-size: var(--km-type-body); }
  .km-source-quote > .km-translation { font-size: 1.25rem; }
  .km-connection { height: 40px; margin-left: 30px; width: 20px; flex-direction: column; }
  .km-connection > span { width: 1px; height: auto; }
  .km-connection > svg { transform: rotate(135deg); }
  .km-note-content, .km-note-footer { padding-inline: 20px; }
  .km-note-content .km-note-heading { font-size: 1.5rem; }
  .km-note-content > p { font-size: var(--km-type-body); }
}
@media (prefers-reduced-motion: reduce) {
  .km-benchmark *, .km-benchmark *::before, .km-benchmark *::after { animation: none !important; transition: none !important; }
}