.ai-timeline { color-scheme: dark; --navy: #1b2838; --ink: #e8edf5; --muted: #93a0b3; --gold: #c0a062; --gold-light: #d8bd86; --line: #2b3648; --surface: #151d28; --surface-alt: #1f2937; --bg: #0a0e17; --text-secondary: #b9c4d4; --border-strong: #5d6c88; }
.ai-timeline * { box-sizing: border-box; }
.ai-timeline { scroll-behavior: smooth; background: var(--bg); }
.ai-timeline { margin: 0; color: var(--ink); font-family: Inter, Arial, sans-serif; -webkit-font-smoothing: antialiased; }
.ai-timeline a { color: inherit; text-decoration: none; }
.ai-timeline button, .ai-timeline input { font: inherit; }
.ai-timeline button, .ai-timeline a, .ai-timeline input { -webkit-tap-highlight-color: transparent; }
.ai-timeline :focus-visible { outline: 2px solid var(--gold); outline-offset: 6px; }
.ai-timeline [hidden] { display: none !important; }
.ai-timeline .sr-only, .ai-timeline .skip:not(:focus) { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.ai-timeline .skip:focus { display: block; padding: 1rem; }
.ai-timeline .site-header { max-width: 1440px; margin: auto; padding: 14px 5vw; display: flex; align-items: center; justify-content: space-between; gap: 1rem; border-bottom: 1px solid #ffffff0d; }
.ai-timeline .wordmark { font-size: 22px; font-weight: 700; letter-spacing: -.055em; }
.ai-timeline .wordmark span { color: var(--gold); }
.ai-timeline .header-caption, .ai-timeline .comparison { font-size: 11px; }
.ai-timeline .header-caption { color: var(--text-secondary); letter-spacing: .1em; text-transform: uppercase; }
.ai-timeline .comparison { color: var(--text-secondary); min-height: 44px; display: inline-flex; align-items: center; gap: 14px; }
.ai-timeline .timeline-shell { margin-inline: auto; padding-inline: 1rem; }
@media (min-width: 640px) { .ai-timeline .timeline-shell { padding-inline: calc(max(0px, (100vw - 640px) / 2) + 1.5rem); } }
@media (min-width: 768px) { .ai-timeline .timeline-shell { padding-inline: calc(max(0px, (100vw - 768px) / 2) + 3rem); } }
@media (min-width: 1024px) { .ai-timeline .timeline-shell { padding-inline: calc(max(0px, (100vw - 1024px) / 2) + 3rem); } }
@media (min-width: 1280px) { .ai-timeline .timeline-shell { padding-inline: calc(max(0px, (100vw - 1280px) / 2) + 3rem); } }

.ai-timeline .intro { padding: 28px 0 18px; display: block; }
.ai-timeline .instrument-note { margin: 0 5vw 26px; max-width: 68ch; color: var(--muted); font-size: 13px; line-height: 1.6; }
.ai-timeline .instrument-note .edition { display: block; margin-bottom: 4px; color: var(--text-secondary); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.ai-timeline .eyebrow { margin: 0 0 18px; color: var(--gold); font-family: ui-monospace, monospace; text-transform: uppercase; font-size: 10px; line-height: 1.5; letter-spacing: .18em; }
.ai-timeline h1 { font-size: clamp(38px, 4.2vw, 60px); font-weight: 500; line-height: .98; letter-spacing: -.065em; margin: 0; }
.ai-timeline h1 > span { color: var(--gold); }
.ai-timeline .intro-note p { max-width: 52ch; font-size: 16px; line-height: 1.6; margin: 0 0 10px; }
.ai-timeline .intro-distinction { font-size: 14px; color: var(--text-secondary); max-width: 56ch; }
.ai-timeline .edition { display: flex; align-items: center; gap: 14px; font: 10px ui-monospace, monospace; color: var(--muted); text-transform: uppercase; letter-spacing: .1em; }
.ai-timeline .rail-viewport { overflow: hidden; }
.ai-timeline .rail { max-width: 100%; }
.ai-timeline .instrument { margin: 0; position: relative; border: 1px solid var(--line); border-radius: 13px; background: radial-gradient(ellipse at 50% 0%, #2b364855, transparent 65%), var(--bg); box-shadow: 0 1px 0 #ffffff13 inset, 0 24px 70px #0005; overflow: hidden; }
.ai-timeline .instrument-heading { padding: 16px 28px 0; border-bottom: 1px solid #ffffff0c; }
.ai-timeline .instrument-instruction { margin: 0 28px 12px; color: var(--text-secondary); font-size: 11px; }
.ai-timeline .current-position { color: var(--text-secondary); font: 11px/1.6 ui-monospace, monospace; }
.ai-timeline .year-index { margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.ai-timeline .year-index a { min-height: 44px; min-width: 56px; display: grid; place-items: center; color: var(--text-secondary); font: 12px ui-monospace, monospace; padding: 0 12px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface-alt); }
.ai-timeline .year-index a:hover, .ai-timeline .year-index a[aria-current="true"] { color: var(--gold-light); border-color: var(--gold); background: #c0a06212; }
.ai-timeline .rail-viewport { position: relative; isolation: isolate; overflow: hidden; }
.ai-timeline .rail-viewport::after, .ai-timeline .rail-viewport::before { content: ""; position: absolute; z-index: 2; top: 0; bottom: 0; width: 28px; pointer-events: none; }
.ai-timeline .rail-viewport::before { left: 0; background: linear-gradient(90deg, var(--bg), transparent); }
.ai-timeline .rail-viewport::after { right: 0; background: linear-gradient(-90deg, var(--bg), transparent); }
.ai-timeline .rail { --card-width: 300px; display: flex; gap: 14px; padding: 18px max(28px, calc((100% - var(--card-width)) / 2)) 25px; overflow-x: auto; scrollbar-width: none; scroll-snap-type: x mandatory; cursor: grab; overscroll-behavior-x: contain; }
.ai-timeline .rail::-webkit-scrollbar { display: none; }
.ai-timeline .rail.is-dragging { scroll-snap-type: none; cursor: grabbing; user-select: none; }
.ai-timeline .event-card { flex: 0 0 var(--card-width); min-width: 0; min-height: 220px; background: var(--surface); padding: 20px; position: relative; scroll-snap-align: center; display: flex; flex-direction: column; background: linear-gradient(155deg, var(--surface-alt), var(--surface) 70%); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 1px 0 #ffffff12 inset, 0 8px 12px #0003; transition: transform 240ms ease, opacity 240ms ease, background 240ms ease, border-color 240ms ease; }
.ai-timeline.has-js .event-card { opacity: .8; transform: translateY(8px) scale(.965); }
.ai-timeline .event-card:hover { opacity: 1; border-color: var(--border-strong); background: var(--surface-alt); }
.ai-timeline.has-js .event-card[aria-current="true"] { opacity: 1; transform: translateY(-6px); border-color: var(--gold); background: linear-gradient(145deg, var(--gold-light), var(--gold)); color: var(--surface); box-shadow: 0 1px 0 #fff9 inset, 0 12px 30px #0007; }
.ai-timeline .event-top { display: flex; align-items: start; justify-content: space-between; gap: 12px; font: 10px ui-monospace, monospace; text-transform: uppercase; letter-spacing: .03em; color: var(--text-secondary); }
.ai-timeline .event-top > span:first-child { max-width: 23ch; }
.ai-timeline .event-number { opacity: .72; }
.ai-timeline .event-card time { margin-top: 18px; font: 10px ui-monospace, monospace; color: var(--text-secondary); }
.ai-timeline .event-card .card-title { margin: 8px 0 20px; font-size: 20px; font-weight: 500; line-height: 1.18; letter-spacing: -.025em; overflow-wrap: anywhere; }
.ai-timeline .event-bottom { margin-top: auto; display: flex; align-items: end; justify-content: space-between; gap: 1rem; font-size: 10px; color: var(--text-secondary); }
.ai-timeline .event-card[aria-current="true"] :is(.event-top, time, .event-bottom) { color: var(--surface); }
.ai-timeline .event-card[aria-current="true"] .event-number { opacity: 1; color: inherit; }
.ai-timeline .card-indicator { display: grid; place-items: center; width: 25px; height: 25px; border-radius: 50%; border: 1px solid currentColor; font-size: 15px; }
.ai-timeline .rail-reticle { position: absolute; z-index: -1; inset: 0 50%; border-left: 1px solid #c0a06270; pointer-events: none; }
.ai-timeline .rail-reticle span { position: absolute; left: -3px; top: 0; height: 5px; width: 5px; background: var(--gold); transform: rotate(45deg); }
.ai-timeline .rail-reticle span:last-child { top: auto; bottom: 0; }
.ai-timeline .scrubber { padding: 14px 0 0; }
.ai-timeline .scrub-meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 20px; align-items: baseline; color: var(--text-secondary); font: 10px/1.6 ui-monospace, monospace; }
.ai-timeline .scale { height: 48px; position: relative; }
.ai-timeline .scale-ticks { height: 32px; display: flex; align-items: end; justify-content: space-between; padding: 0 9px; pointer-events: none; }
.ai-timeline .tick { display: block; height: 9px; width: 1px; background: var(--border-strong); }
.ai-timeline .tick.major { height: 20px; background: var(--text-secondary); }
.ai-timeline input[type="range"] { position: absolute; inset: 0; width: 100%; height: 48px; margin: 0; appearance: none; background: transparent; cursor: ew-resize; }
.ai-timeline input[type="range"]::-webkit-slider-runnable-track { height: 1px; background: var(--border-strong); }
.ai-timeline input[type="range"]::-moz-range-track { height: 1px; background: var(--border-strong); }
.ai-timeline input[type="range"]::-webkit-slider-thumb { appearance: none; height: 32px; width: 17px; margin-top: -16px; border: 1px solid var(--gold-light); border-radius: 3px; background: repeating-linear-gradient(90deg, var(--gold) 0 2px, var(--gold-light) 2px 3px); box-shadow: 0 3px 10px #000b, 0 1px 0 #fff8 inset; }
.ai-timeline input[type="range"]::-moz-range-thumb { height: 32px; width: 17px; border: 1px solid var(--gold-light); border-radius: 3px; background: repeating-linear-gradient(90deg, var(--gold) 0 2px, var(--gold-light) 2px 3px); box-shadow: 0 3px 10px #000b; }
.ai-timeline .selection-context { margin: 0 28px 14px; padding-top: 8px; border-top: 1px solid #2b364855; }
.ai-timeline .selection-context { display: grid; justify-items: center; margin: 0 auto; }
.ai-timeline .selection-summary { width: min(100%, 64ch); margin: 8px 0 0; text-align: left; color: var(--text-secondary); font-size: 15px; line-height: 1.7; }
@media (min-width: 801px) { .ai-timeline .selection-summary { min-height: calc(7 * 1.7em); } }
.ai-timeline .selection-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; align-items: center; gap: 8px 20px; }
.ai-timeline .read-context { min-height: 44px; display: inline-flex; align-items: center; gap: 18px; color: var(--gold-light); font-size: 12px; }
.ai-timeline .read-context:hover { text-decoration: underline; text-underline-offset: 4px; }
.ai-timeline .reading { margin: 60px 0; display: grid; grid-template-columns: minmax(232px, 0.46fr) minmax(0, 1.9fr); gap: 3.5vw; align-items: start; scroll-margin-top: 24px; }
.ai-timeline .reading-side { position: sticky; top: 24px; }
.ai-timeline .reading-side { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.ai-timeline .record-nav { display: none; grid-template-columns: 1fr 1fr; gap: 8px; width: 100%; }
.ai-timeline.has-js .record-nav { display: grid; }
.ai-timeline .nav-step { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 44px; padding: 10px 12px; border: 1px solid var(--border-strong); border-radius: 3px; color: var(--gold); font-size: 14px; line-height: 1.3; text-decoration: none; white-space: nowrap; }
.ai-timeline .nav-step:hover { border-color: var(--gold); }
.ai-timeline .nav-step[aria-disabled="true"] { color: var(--muted); border-color: var(--border-strong); background: var(--surface); pointer-events: none; cursor: not-allowed; }
.ai-timeline:not(.has-js) .timeline-filters, .ai-timeline:not(.has-js) .timeline-type-filter, .ai-timeline:not(.has-js) .reset-filters { display: none; }
.ai-timeline .timeline-list .list-label { font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--text-secondary); margin: 16px 0 8px; }
.ai-timeline .timeline-list { border-top: 1px solid var(--line); padding-top: 4px; }
.ai-timeline .reading-side .back-to-rail { display: inline-block; box-sizing: border-box; min-height: 44px; padding: 12px 2px; font-size: 14px; line-height: 1.3; color: var(--text-secondary); text-decoration: underline; text-underline-offset: 4px; }
.ai-timeline .back-to-rail { display: inline-block; padding: 18px 0; font-size: 12px; color: var(--gold); }
.ai-timeline .reading-panels { min-width: 0; }
.ai-timeline .timeline-source-limit, .ai-timeline .timeline-detail p, .ai-timeline .timeline-detail li { overflow-wrap: anywhere; }
.ai-timeline .timeline-detail { padding-top: 20px; border-top: 1px solid #2b364040; margin-bottom: 3rem; overflow-wrap: anywhere; }
.ai-timeline .timeline-kicker { color: var(--gold); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; line-height: 1.6; text-transform: uppercase; letter-spacing: .06em; margin: 0 0 4px; }
.ai-timeline .timeline-detail h2 { font-size: clamp(28px, 3vw, 40px); font-weight: 400; line-height: 1.15; letter-spacing: -.03em; margin: 18px 0 20px; }
.ai-timeline .timeline-detail h3 { font-size: 14px; color: var(--ink); letter-spacing: .01em; margin: 28px 0 10px; }
.ai-timeline .timeline-detail p.timeline-kicker { font-size: 12px; line-height: 1.6; color: var(--gold); letter-spacing: .06em; }
.ai-timeline .timeline-detail p, .ai-timeline .timeline-detail li { font-size: 16px; line-height: 1.7; color: var(--text-secondary); max-width: 68ch; }
.ai-timeline .timeline-detail .timeline-summary { font-size: 17px; line-height: 1.65; color: var(--text-secondary); }
.ai-timeline .timeline-detail a { color: var(--gold); text-decoration: underline; text-underline-offset: 4px; }
.ai-timeline .timeline-pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 22px; max-width: 68ch; }
.ai-timeline .timeline-pill { font-size: 12px; line-height: 1.5; color: var(--text-secondary); padding: 5px 9px; background: var(--surface-alt); border: 1px solid var(--border-strong); border-radius: 3px; overflow-wrap: anywhere; }
.ai-timeline .timeline-detail details { padding-top: 15px; margin-top: 20px; border-top: 1px solid var(--line); }
.ai-timeline .timeline-detail summary { padding: 12px 0; cursor: pointer; font-size: 14px; color: var(--gold); }
.ai-timeline .timeline-detail dl { display: grid; grid-template-columns: 8rem minmax(0, 1fr); gap: 12px; font-size: 14px; line-height: 1.6; }
.ai-timeline .timeline-detail dd { margin: 0; }
.ai-timeline .timeline-detail dt { color: var(--muted); }
.ai-timeline .page-footer { margin: 0 5vw; border-top: 1px solid var(--line); padding: 24px 0; display: flex; justify-content: space-between; gap: 1rem; color: var(--muted); font: 10px/1.7 ui-monospace, monospace; }
@media (max-width: 800px) {
  .ai-timeline .header-caption { display: none; }
  .ai-timeline .intro { grid-template-columns: 1fr; padding-top: 24px; gap: 14px; }
  .ai-timeline .intro-note p { font-size: 13px; }
  .ai-timeline .edition { font-size: 8px; gap: 8px; }
  .ai-timeline .reading { gap: 4vw; grid-template-columns: 1fr; }
  .ai-timeline .reading-side { position: static; flex-direction: row; align-items: center; justify-content: flex-start; flex-wrap: wrap; gap: 8px 16px; }
  .ai-timeline .reading-side .back-to-rail { margin-left: auto; padding: 8px 0; }
  .ai-timeline .reading-side .record-nav { width: auto; grid-template-columns: repeat(2, minmax(104px, 148px)); }
}
@media (max-width: 560px) {
  .ai-timeline .site-header { padding: 14px 5vw; }
  .ai-timeline .wordmark { font-size: 19px; }
  .ai-timeline .comparison { font-size: 9px; gap: 6px; }
  .ai-timeline .intro { grid-template-columns: 1fr; gap: 12px; padding: 22px 0 18px; }
  .ai-timeline h1 { font-size: 40px; }
  .ai-timeline .intro-note { display: flex; flex-direction: column; gap: 10px; }
  .ai-timeline .intro-note p { max-width: 36ch; margin: 0; font-size: 13px; }
  .ai-timeline .eyebrow { font-size: 8px; margin-bottom: 16px; }
  .ai-timeline .edition { font-size: 9px; }
  .ai-timeline .instrument { margin: 0; border-radius: 9px; }
  .ai-timeline .instrument-heading { padding: 12px 16px 0; }
  .ai-timeline .year-index { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; }
  .ai-timeline .year-index a { font-size: 11px; min-width: 0; }
  .ai-timeline .rail { --card-width: min(260px, 76vw); gap: 12px; padding-top: 17px; padding-bottom: 20px; }
  .ai-timeline .event-card { padding: 18px; min-height: 218px; }
  .ai-timeline .event-card .card-title { font-size: 19px; }
  .ai-timeline .event-top { font-size: 9px; }
  .ai-timeline .scrubber { padding: 12px 0 0; }
  .ai-timeline .scrub-meta { font-size: 9px; }
  .ai-timeline .instrument-instruction { margin-inline: 16px; font-size: 10px; }
  .ai-timeline .selection-context { margin-inline: 16px; }
  .ai-timeline .selection-summary { font-size: 15px; }
  .ai-timeline .read-context { min-height: 44px; }
  .ai-timeline .reading { margin: 40px 6vw; grid-template-columns: 1fr; gap: 22px; }
  .ai-timeline .reading-side { position: static; flex-direction: row; align-items: center; flex-wrap: wrap; gap: 8px 16px; }
  .ai-timeline .reading-side .record-nav { width: auto; grid-template-columns: repeat(2, minmax(104px, 148px)); }
  .ai-timeline .reading-side .back-to-rail { margin-left: auto; padding: 8px 0; }
  .ai-timeline .timeline-detail h2 { font-size: 29px; }
  .ai-timeline .page-footer { flex-direction: column; font-size: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  .ai-timeline { scroll-behavior: auto; }
  .ai-timeline *, .ai-timeline *::before, .ai-timeline *::after { transition: none !important; animation: none !important; }
}

.ai-timeline .instrument { scroll-margin-top: 16px; }

.ai-timeline .instrument-toolbar { margin-left: auto; display: flex; align-items: center; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }
.ai-timeline .timeline-refine { width: auto; margin: 0; border: 0; }
.ai-timeline .timeline-refine > summary { white-space: nowrap; }
.ai-timeline .timeline-refine .filter-body { position: static; width: min(100%, 560px); margin-top: 10px; padding: 16px; background: var(--surface); border: 1px solid var(--border-strong); border-radius: 4px; box-shadow: 0 18px 40px #0007; }
.ai-timeline .scrub-meta { position: relative; flex-wrap: wrap; gap: 8px 12px; }
@media (max-width: 640px) { .ai-timeline .instrument-toolbar { margin-left: 0; width: 100%; } .ai-timeline .instrument-toolbar { width: 100%; } .ai-timeline .timeline-refine > summary { width: 100%; justify-content: space-between; } .ai-timeline .view-entry { flex: 1 1 auto; justify-content: center; } }
.ai-timeline .view-entry { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; padding: 8px 14px; border: 1px solid var(--border-strong); border-radius: 3px; color: var(--ink); font-size: 14px; text-decoration: none; }
.ai-timeline .view-entry:hover { border-color: var(--gold); }
.ai-timeline .timeline-refine > summary { min-height: 44px; display: inline-flex; width: auto; align-items: center; gap: 8px; padding: 8px 14px; cursor: pointer; color: var(--ink); font-size: 14px; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--surface); list-style: none; }
.ai-timeline .timeline-refine > summary::-webkit-details-marker { display: none; }
.ai-timeline .timeline-refine .chev { width: 8px; height: 8px; border-right: 2px solid var(--gold); border-bottom: 2px solid var(--gold); transform: rotate(45deg); transition: transform .15s ease; }
.ai-timeline .timeline-refine[open] .chev { transform: rotate(-135deg); }
.ai-timeline .timeline-refine > summary:hover { border-color: var(--gold); }
.ai-timeline .timeline-refine[open] > summary { border-color: var(--gold); }
.ai-timeline .filter-count { color: var(--text-secondary); font: 10px ui-monospace, monospace; margin-left: 16px; }
.ai-timeline .filter-body { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 10px 0 20px; }
.ai-timeline .timeline-filters { display: flex; flex-wrap: wrap; gap: 6px; }
.ai-timeline .timeline-filters button, .ai-timeline .reset-filters, .ai-timeline select { min-height: 44px; color: var(--ink); background: var(--surface-alt); border: 1px solid var(--line); border-radius: 4px; padding: 8px 12px; font-size: 11px; cursor: pointer; }
.ai-timeline .timeline-filters button[aria-pressed="true"] { color: var(--surface); background: var(--gold); border-color: var(--gold); }
.ai-timeline .timeline-type-filter { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; font-size: 11px; }
.ai-timeline .year-index a[aria-disabled="true"] { opacity: .4; cursor: default; }
.ai-timeline .timeline-empty { padding: 36px 28px; font-size: 16px; line-height: 1.6; color: var(--ink); }
.ai-timeline .timeline-list, .ai-timeline .timeline-guide-index, .ai-timeline .timeline-method, .ai-timeline .timeline-reference-notice { margin: 32px 5vw; }
.ai-timeline .timeline-list > summary, .ai-timeline .timeline-method > summary { min-height: 44px; cursor: pointer; padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--gold); font-size: 13px; }
.ai-timeline .timeline-list > summary span { margin-left: 16px; color: var(--muted); font-size: 11px; }
.ai-timeline .timeline-index { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
.ai-timeline .timeline-index [data-row] { display: block; padding: 20px 16px; border-bottom: 1px solid var(--line); min-height: 44px; }
.ai-timeline .timeline-index [aria-current="true"] { background: #c0a06210; box-shadow: inset 2px 0 var(--gold); }
.ai-timeline .timeline-index time, .ai-timeline .timeline-type { display: block; color: var(--gold); font: 10px/1.7 ui-monospace,monospace; }
.ai-timeline .timeline-index strong { display: block; margin: 8px 0; font-size: 15px; font-weight: 500; line-height: 1.4; }
.ai-timeline .timeline-index em { font-size: 12px; line-height: 1.6; display: block; font-style: normal; color: var(--text-secondary); }
.ai-timeline .timeline-row-meta { display: block; margin-top: 10px; color: var(--muted); font-size: 10px; }
.ai-timeline .timeline-guide-index { border-top: 1px solid var(--line); padding-top: 24px; }
.ai-timeline .timeline-guide-index h2, .ai-timeline .timeline-method h2, .ai-timeline .timeline-reference-notice h2 { font-size: 18px; font-weight: 500; }
.ai-timeline .timeline-guide-index p, .ai-timeline .timeline-method p, .ai-timeline .timeline-reference-notice p { color: var(--text-secondary); font-size: 13px; line-height: 1.7; }
.ai-timeline .timeline-guide-index ul { padding: 0; list-style: none; }
.ai-timeline .timeline-guide-index a { display: flex; flex-wrap: wrap; gap: 12px; min-height: 44px; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
.ai-timeline .timeline-guide-label, .ai-timeline .timeline-guide-arrow, .ai-timeline .timeline-method a { color: var(--gold); }
.ai-timeline .timeline-guide-arrow { margin-left: auto; }
.ai-timeline .timeline-reference-target { scroll-margin-top: 24px; }
@media (max-width: 560px) {
  .ai-timeline .filter-count { display: block; margin: 8px 0 0; }
  .ai-timeline .timeline-index { grid-template-columns: minmax(0,1fr); }
}

.ai-timeline .timeline-refine[open] { flex-basis: 100%; order: 3; }
.ai-timeline .timeline-refine[open] > summary { margin-left: auto; }
.ai-timeline .timeline-refine .filter-body { width: 100%; }
@media (max-width: 640px) { .ai-timeline .year-index { display: flex; flex-wrap: nowrap; overflow-x: auto; gap: 8px; padding-bottom: 2px; } .ai-timeline .year-index a { flex: 0 0 auto; } }

.ai-timeline .reset-empty { min-height: 44px; padding: 8px 14px; border: 1px solid var(--gold); border-radius: 3px; background: var(--gold); color: var(--surface); font-size: 14px; cursor: pointer; }

.ai-timeline .browse-toggle { min-height: 44px; padding: 8px 14px; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--surface); color: var(--ink); font-size: 14px; cursor: pointer; }
.ai-timeline .browse-toggle:hover, .ai-timeline .browse-toggle[aria-expanded="true"] { border-color: var(--gold); }
.ai-timeline .timeline-results { margin: 14px 0 0; padding: 14px 0 0; border-top: 1px solid var(--line); }
.ai-timeline .results-status { margin: 0 0 10px; color: var(--muted); font-size: 13px; }
.ai-timeline .results-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.ai-timeline .results-list a { display: grid; grid-template-columns: 8.5rem minmax(0, 1fr); gap: 12px; padding: 9px 10px; border-radius: 3px; color: var(--text-secondary); font-size: 14px; text-decoration: none; }
.ai-timeline .results-list a:hover, .ai-timeline .results-list a:focus-visible { background: var(--surface-alt); color: var(--ink); }
.ai-timeline .results-list time { color: var(--muted); font-family: ui-monospace, monospace; font-size: 12px; }
.ai-timeline .results-pager { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.ai-timeline .results-pager button { min-height: 44px; padding: 8px 14px; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--surface); color: var(--ink); font-size: 14px; }
.ai-timeline .results-pager button[disabled] { color: var(--muted); border-color: var(--line); cursor: default; }
.ai-timeline .page-range { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; }
@media (max-width: 640px) { .ai-timeline .results-list a { grid-template-columns: 1fr; gap: 2px; } }

.ai-timeline:not(.has-js) .browse-toggle, .ai-timeline:not(.has-js) .results-pager, .ai-timeline:not(.has-js) .results-status { display: none; }

/* consolidated browse section */
.ai-timeline .timeline-results { margin: 16px 0 0; padding: 16px 20px 18px; border: 1px solid var(--line); border-radius: 4px; background: var(--surface); }
.ai-timeline .results-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 16px; padding-bottom: 12px; margin-bottom: 10px; border-bottom: 1px solid var(--line); }
.ai-timeline .results-status { margin: 0; color: var(--text-secondary); font-size: 13px; }
.ai-timeline .results-filters { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.ai-timeline .clear-filters { min-height: 36px; padding: 6px 10px; background: none; border: 0; color: var(--muted); font-size: 13px; text-decoration: underline; text-underline-offset: 3px; cursor: pointer; }
.ai-timeline .clear-filters:hover { color: var(--gold); }
.ai-timeline .results-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.ai-timeline .results-list a { display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: 14px; padding: 9px 10px; border-radius: 3px; color: var(--text-secondary); font-size: 14px; line-height: 1.5; text-decoration: none; }
.ai-timeline .results-list a:hover, .ai-timeline .results-list a:focus-visible { background: var(--surface-alt); color: var(--ink); }
.ai-timeline .results-list time { color: var(--muted); font-family: ui-monospace, monospace; font-size: 12px; }
.ai-timeline .results-pager { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); }
.ai-timeline .results-pager button { min-width: 118px; min-height: 44px; padding: 8px 16px; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--surface-alt); color: var(--ink); font-size: 14px; }
.ai-timeline .results-pager button[disabled] { color: var(--muted); border-color: var(--line); background: none; cursor: default; }
.ai-timeline .page-range { color: var(--text-secondary); font-size: 13px; font-variant-numeric: tabular-nums; min-width: 9ch; text-align: center; }
@media (max-width: 640px) { .ai-timeline .timeline-results { padding: 14px 14px 16px; } .ai-timeline .results-list a { grid-template-columns: 1fr; gap: 2px; } .ai-timeline .results-pager button { min-width: 0; flex: 1 1 0; } .ai-timeline .results-pager { gap: 8px; } }

.ai-timeline .instrument-toolbar { padding: 14px 20px; margin: 0; }
.ai-timeline .browse-toggle { display: inline-flex; align-items: center; gap: 8px; min-width: 15.5rem; justify-content: center; }
.ai-timeline .browse-toggle .toggle-chev { width: 8px; height: 8px; border-right: 2px solid var(--gold); border-bottom: 2px solid var(--gold); transform: rotate(45deg); transition: transform .15s ease; }
.ai-timeline .browse-toggle[aria-expanded="true"] .toggle-chev { transform: rotate(-135deg); }
@media (max-width: 640px) { .ai-timeline .instrument-toolbar { padding: 12px 14px; justify-content: flex-start; } .ai-timeline .browse-toggle { min-width: 13rem; } }

@media (min-width: 641px) { .ai-timeline .year-index { display: flex; justify-content: center; gap: 8px; } .ai-timeline .year-index a { flex: 0 0 auto; } }
@media (max-width: 640px) { .ai-timeline .year-index { justify-content: flex-start; } }

@media (min-width: 641px) { .ai-timeline .instrument-heading .year-index { display: flex; flex-wrap: wrap; justify-content: center; } }

@media (min-width: 641px) { .ai-timeline .instrument-heading .year-index { width: max-content; max-width: 100%; margin-inline: auto; } }

.ai-timeline .about-toggle { flex: 0 0 auto; width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--surface); color: var(--text-secondary); cursor: pointer; }
.ai-timeline .about-toggle:hover, .ai-timeline .about-toggle:focus-visible { border-color: var(--gold); color: var(--gold); }
.ai-timeline .about-glyph { font: 600 15px/1 Inter, sans-serif; font-style: normal; }
.ai-timeline .about-dialog { width: min(92vw, 640px); max-height: 84vh; padding: 0; border: 1px solid var(--border-strong); border-radius: 6px; background: var(--surface); color: var(--ink); overflow: auto; }
.ai-timeline .about-dialog::backdrop { background: #05070bcc; }
.ai-timeline .about-inner { padding: 24px 24px 26px; }
.ai-timeline .about-head { display: flex; align-items: start; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.ai-timeline .about-dialog h2 { margin: 0; font-size: 22px; line-height: 1.2; letter-spacing: -.02em; }
.ai-timeline .about-close { min-height: 44px; padding: 8px 14px; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--surface-alt); color: var(--ink); font-size: 14px; cursor: pointer; }
.ai-timeline .about-dialog p { margin: 0 0 12px; font-size: 15px; line-height: 1.65; color: var(--text-secondary); }
.ai-timeline .about-dialog a { color: var(--gold); }
@media (max-width: 640px) { .ai-timeline .about-inner { padding: 18px 16px 20px; } }
.ai-timeline:not(.has-js) .about-toggle { display: none; }
.ai-timeline:not(.has-js) .about-dialog { display: block; position: static; width: auto; max-height: none; margin: 0 0 20px; border: 0; border-top: 1px solid var(--line); padding-top: 16px; }
.ai-timeline:not(.has-js) .about-close { display: none; }

.ai-timeline .event-card .card-indicator { opacity: 0; visibility: hidden; transition: opacity .15s ease, visibility .15s ease; }
.ai-timeline .event-card:hover .card-indicator, .ai-timeline .event-card:focus .card-indicator, .ai-timeline .event-card:focus-visible .card-indicator, .ai-timeline .event-card:focus-within .card-indicator, .ai-timeline .event-card[aria-current="true"] .card-indicator { opacity: 1; visibility: visible; }
@media (hover: none) { .ai-timeline .event-card .card-indicator { opacity: 1; visibility: visible; transition: none; } }
@media (prefers-reduced-motion: reduce) { .ai-timeline .card-indicator { transition: none; } }