:root {
  color-scheme: dark;
  --bg: #070b12;
  --surface: #0b111c;
  --surface-2: #101827;
  --text: #edf3fb;
  --text-soft: #a8b4c5;
  --text-muted: #718096;
  --border: #202c3d;
  --border-strong: #34465f;
  --accent: #5b7fff;
  --accent-strong: #355ee7;
  --cyan: #56d6ff;
  --danger: #f06a5d;
  --success: #49b58a;
  --paper: var(--bg);
  --paper-deep: var(--surface);
  --ink: var(--text);
  --ink-soft: var(--text-soft);
  --muted: var(--text-muted);
  --line: var(--border);
  --line-dark: var(--border-strong);
  --blue: var(--accent);
  --blue-dark: var(--accent-strong);
  --red: var(--danger);
  --yellow: #d5b84b;
  --green: var(--success);
  --white: var(--surface);
  --sans: 'Sora', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --serif: 'Sora', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --max: 1240px;
  --gutter: clamp(20px, 4vw, 64px);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
}

html[data-theme='light'] {
  color-scheme: light;
  --bg: #f7f9fc;
  --surface: #ffffff;
  --surface-2: #eef2f8;
  --text: #0b1220;
  --text-soft: #344054;
  --text-muted: #667085;
  --border: #dbe2ec;
  --border-strong: #b7c3d3;
  --accent: #315fda;
  --accent-strong: #2448bd;
  --cyan: #087fa8;
  --danger: #d65347;
  --success: #197354;
  --yellow: #f0ce62;
  --shadow: 0 18px 50px rgba(35, 55, 80, 0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(color-mix(in srgb, var(--text) 3%, transparent) 1px, transparent 1px),
    var(--paper);
  background-size: 100% 32px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: '';
  pointer-events: none;
  background: radial-gradient(circle at 50% -10%, color-mix(in srgb, var(--accent) 17%, transparent), transparent 38%);
}

button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
svg { width: 1.1em; height: 1.1em; flex: none; }
button { color: inherit; }

::selection { background: var(--blue); color: var(--white); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-140%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(16px);
  transition: box-shadow 180ms ease, background 180ms ease;
}

.site-header.is-scrolled { box-shadow: 0 10px 32px rgba(23, 23, 20, 0.08); }

.header-inner {
  width: min(100%, calc(var(--max) + var(--gutter) * 2));
  height: 76px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand { display: inline-flex; align-items: center; gap: 13px; min-width: max-content; }
.brand-mark { width: 28px; height: 28px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 3px; transform: rotate(-8deg); }
.brand-mark i { display: block; background: var(--ink); }
.brand-mark i:nth-child(2) { background: var(--blue); transform: translateY(5px); }
.brand-mark i:nth-child(3) { background: var(--red); transform: translateY(10px); }
.brand strong { display: block; font: 600 15px/1.1 var(--sans); letter-spacing: -0.02em; }
.brand small { display: block; margin-top: 4px; color: var(--muted); font: 500 10px/1 var(--sans); letter-spacing: .13em; }

.desktop-nav { display: flex; align-items: stretch; align-self: stretch; }
.desktop-nav a { position: relative; min-width: 64px; padding: 0 14px; display: grid; place-items: center; color: var(--ink-soft); font-size: 13px; font-weight: 500; }
.desktop-nav a::after { position: absolute; right: 14px; bottom: -1px; left: 14px; height: 3px; content: ''; background: var(--blue); transform: scaleX(0); transform-origin: center; transition: transform 160ms ease; }
.desktop-nav a:hover::after, .desktop-nav a[aria-current='page']::after { transform: scaleX(1); }
.desktop-nav a[aria-current='page'] { color: var(--ink); }
.desktop-nav .external-nav-link { display: flex; gap: 6px; }
.external-nav-link i,
.external-footer-link i { font: 500 12px/1 var(--mono); transition: transform 160ms ease; }
.external-nav-link:hover i,
.external-footer-link:hover i { transform: translate(2px, -2px); }

.header-actions { display: flex; align-items: center; }
.search-trigger {
  height: 38px;
  padding: 0 8px 0 12px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(255,255,255,.3);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 12px;
  transition: border 160ms ease, background 160ms ease;
}
.search-trigger:hover { border-color: var(--ink); background: var(--white); }
.search-trigger kbd { margin-left: 8px; padding: 2px 5px; border: 1px solid var(--line); border-radius: 2px; color: var(--muted); font: 10px var(--mono); }
.menu-trigger { display: none; width: 42px; height: 42px; padding: 10px; border: 0; background: transparent; cursor: pointer; }
.menu-trigger span { display: block; height: 1px; margin: 5px 0; background: var(--ink); }
.mobile-nav { display: none; }

main { min-height: calc(100vh - 250px); overflow: clip; }

.button {
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 600;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 5px 5px 0 var(--ink); }
.button-primary { background: var(--ink); color: var(--white); }
.button-primary:hover { background: var(--blue); box-shadow: 5px 5px 0 var(--red); }
.button-quiet { background: transparent; }
.text-link, .section-link { display: inline-flex; align-items: center; gap: 7px; color: var(--blue); font-size: 13px; font-weight: 600; }

.home-hero {
  position: relative;
  width: min(100%, calc(var(--max) + var(--gutter) * 2));
  min-height: 650px;
  margin: 0 auto;
  padding: 82px var(--gutter) 72px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(390px, .72fr);
  gap: clamp(56px, 8vw, 120px);
  align-items: center;
}

.home-hero::before { position: absolute; top: 0; bottom: 0; left: calc(var(--gutter) + 48%); width: 1px; content: ''; background: var(--line); }
.hero-copy h1 { max-width: 720px; margin: 0; font: 900 clamp(44px, 5vw, 66px)/1.14 var(--serif); letter-spacing: -0.05em; text-wrap: balance; }
.hero-copy > p { max-width: 650px; margin: 24px 0 0; color: var(--ink-soft); font: 500 clamp(17px, 1.5vw, 20px)/1.85 var(--serif); }
.hero-actions { margin-top: 30px; display: flex; flex-wrap: wrap; gap: 12px; }

.hero-chronology { position: relative; padding: 22px 0 16px; }
.chronology-head { padding-bottom: 16px; border-bottom: 2px solid var(--ink); display: flex; justify-content: space-between; gap: 16px; font: 500 10px/1 var(--mono); letter-spacing: .1em; }
.hero-chronology ol { margin: 0; padding: 0; list-style: none; }
.hero-chronology li { border-bottom: 1px solid var(--line); }
.hero-chronology a { position: relative; min-height: 74px; display: grid; grid-template-columns: 64px 1fr; align-items: center; gap: 18px; }
.hero-chronology time { color: var(--red); font: 500 12px var(--mono); }
.hero-chronology a > span { position: relative; z-index: 1; font: 600 15px var(--serif); }
.hero-chronology i { position: absolute; inset: 0; z-index: 0; background: var(--yellow); transform: scaleX(0); transform-origin: left; transition: transform 220ms ease var(--delay); }
.hero-chronology a:hover i { transform: scaleX(1); }
.hero-index { position: absolute; right: var(--gutter); bottom: 28px; left: var(--gutter); display: flex; justify-content: space-between; color: var(--muted); font: 500 9px var(--mono); letter-spacing: .18em; }
.hero-index b { color: var(--ink); font-size: 11px; }

.section, .topic-band { width: min(100%, calc(var(--max) + var(--gutter) * 2)); margin: 0 auto; padding: 112px var(--gutter); }
.section-heading { margin-bottom: 54px; }
.split-heading { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .65fr); align-items: end; gap: 40px; }
.split-heading > div { display: grid; grid-template-columns: 38px 1fr; gap: 24px; align-items: start; }
.section-number, .page-index { color: var(--red); font: 500 10px/1.2 var(--mono); letter-spacing: .13em; text-transform: uppercase; }
.section-heading h2 { margin: -4px 0 0; font: 800 clamp(30px, 3.4vw, 46px)/1.22 var(--serif); letter-spacing: -0.035em; }
.section-heading > p, .section-heading > a { margin: 0; }
.section-heading > p { color: var(--ink-soft); font: 500 16px/1.9 var(--serif); }

.section-turning-points { border-top: 1px solid var(--line); }
.turning-list { border-top: 2px solid var(--ink); }
.turning-item { min-height: 122px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 54px 84px minmax(0, 1fr) 32px; gap: 24px; align-items: center; transition: background 160ms ease, padding 160ms ease; }
.turning-item:hover { padding: 0 20px; background: var(--yellow); }
.turning-order, .turning-item time { color: var(--muted); font: 500 11px var(--mono); }
.turning-item time { color: var(--red); }
.turning-item h3 { margin: 0; font: 700 24px/1.35 var(--serif); letter-spacing: -0.025em; }
.turning-item p { margin: 6px 0 0; color: var(--muted); font-size: 13px; }

.topic-band { position: relative; width: 100%; max-width: none; padding-right: max(var(--gutter), calc((100vw - var(--max)) / 2 + var(--gutter))); padding-left: max(var(--gutter), calc((100vw - var(--max)) / 2 + var(--gutter))); background: var(--ink); color: var(--white); }
.topic-band .section-number { color: var(--yellow); }
.topic-band .split-heading > p { color: #b9b7ae; }
.topic-index { border-top: 1px solid #55534b; display: grid; grid-template-columns: repeat(4, 1fr); }
.topic-index a { position: relative; min-height: 255px; padding: 26px 26px 30px; border-right: 1px solid #55534b; display: flex; flex-direction: column; overflow: hidden; }
.topic-index a:last-child { border-right: 0; }
.topic-index a::before { position: absolute; inset: auto 0 0; height: 0; content: ''; background: var(--blue); transition: height 220ms ease; }
.topic-index a:hover::before { height: 100%; }
.topic-index a > * { position: relative; z-index: 1; }
.topic-index a > span { color: #8f8d84; font: 500 10px var(--mono); }
.topic-index h3 { margin: auto 0 6px; font: 700 25px/1.35 var(--serif); }
.topic-index p { margin: 0; color: #aaa89e; font-size: 12px; }
.topic-index svg { position: absolute; right: 24px; bottom: 28px; opacity: 0; transform: translateX(-8px); transition: opacity 180ms ease, transform 180ms ease; }
.topic-index a:hover svg { opacity: 1; transform: translateX(0); }
.topic-band > .section-link { margin-top: 32px; color: var(--white); }

.learning-section { border-bottom: 1px solid var(--line); }
.learning-path { position: relative; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); list-style: none; }
.learning-path::before { position: absolute; top: 25px; right: 10%; left: 10%; height: 1px; content: ''; background: var(--line-dark); }
.learning-path li { position: relative; min-width: 0; }
.learning-path a { height: 100%; padding: 0 18px; display: flex; flex-direction: column; }
.learning-path li:first-child a { padding-left: 0; }
.learning-path li:last-child a { padding-right: 0; }
.learning-path a > span { position: relative; z-index: 1; width: 50px; height: 50px; border: 1px solid var(--ink); border-radius: 50%; background: var(--paper); display: grid; place-items: center; font: 500 12px var(--mono); transition: background 180ms ease, color 180ms ease; }
.learning-path a:hover > span { background: var(--red); color: var(--white); }
.learning-path time { margin-top: 32px; color: var(--blue); font: 500 11px var(--mono); }
.learning-path h3 { min-height: 58px; margin: 10px 0 12px; font: 700 20px/1.45 var(--serif); }
.learning-path p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.75; }

.recent-list { border-top: 2px solid var(--ink); }
.recent-list article { padding: 28px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 190px minmax(240px, .7fr) minmax(300px, 1fr); gap: 34px; align-items: start; }
.recent-list article > div { display: flex; align-items: center; gap: 12px; }
.recent-list time { color: var(--red); font: 500 11px var(--mono); }
.recent-list h3 { margin: 0; font: 700 20px var(--serif); }
.recent-list p { margin: 0; color: var(--muted); font-size: 13px; }

.importance { display: inline-flex; align-items: center; border: 1px solid currentColor; color: var(--ink); }
.importance b { min-width: 28px; padding: 5px 7px; background: currentColor; color: var(--paper); text-align: center; font: 600 10px var(--mono); }
.importance span { padding: 4px 8px; font-size: 10px; font-weight: 600; }
.importance-s { color: var(--red); }
.importance-a { color: var(--blue); }
.importance-b { color: var(--green); }
.importance-c { color: var(--muted); }
.importance.compact b { min-width: 23px; padding: 3px 5px; }
.importance.compact span { padding: 2px 6px; font-size: 9px; }

.page-intro {
  width: min(100%, calc(var(--max) + var(--gutter) * 2));
  min-height: 360px;
  margin: 0 auto;
  padding: 96px var(--gutter) 70px;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, .65fr);
  gap: 50px;
  align-items: end;
}
.page-index { display: block; margin-bottom: 18px; }
.page-intro h1 { margin: 0; font: 900 clamp(48px, 5.8vw, 76px)/1.02 var(--serif); letter-spacing: -0.055em; }
.page-intro > p { margin: 0; color: var(--ink-soft); font: 500 17px/1.9 var(--serif); }

.chronicle-page {
  --chronicle-bg: #070b12;
  --chronicle-surface: #0b111c;
  --chronicle-surface-2: #101827;
  --chronicle-text: #edf3fb;
  --chronicle-soft: #a8b4c5;
  --chronicle-muted: #69778b;
  --chronicle-line: #202c3d;
  --chronicle-line-strong: #34465f;
  --chronicle-blue: #4d78ff;
  --chronicle-cyan: #5ed8ff;
  --chronicle-red: #f06458;
  background:
    linear-gradient(rgba(112, 147, 196, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(112, 147, 196, .025) 1px, transparent 1px),
    var(--chronicle-bg);
  background-size: 100% 40px, 40px 100%, auto;
  color: var(--chronicle-text);
}
.chronicle-page::before { background: radial-gradient(circle at 50% -10%, rgba(77, 120, 255, .18), transparent 38%); }
.chronicle-page .site-header { border-bottom-color: var(--chronicle-line); background: rgba(7, 11, 18, .86); }
.chronicle-page .site-header.is-scrolled { box-shadow: 0 14px 40px rgba(0, 0, 0, .28); }
.chronicle-page .brand-mark i:first-child { background: var(--chronicle-text); }
.chronicle-page .brand strong { color: var(--chronicle-text); }
.chronicle-page .brand small { color: var(--chronicle-muted); }
.chronicle-page .desktop-nav a { color: var(--chronicle-soft); }
.chronicle-page .desktop-nav a[aria-current='page'] { color: var(--chronicle-text); }
.chronicle-page .desktop-nav a::after { background: var(--chronicle-blue); }
.chronicle-page .search-trigger { border-color: var(--chronicle-line-strong); background: rgba(255, 255, 255, .02); color: var(--chronicle-soft); }
.chronicle-page .search-trigger:hover { border-color: var(--chronicle-blue); background: var(--chronicle-surface-2); color: var(--chronicle-text); }
.chronicle-page .search-trigger kbd { border-color: var(--chronicle-line-strong); color: var(--chronicle-muted); }
.chronicle-page .menu-trigger span { background: var(--chronicle-text); }
.chronicle-page .mobile-nav { border-bottom-color: var(--chronicle-line); background: var(--chronicle-bg); }
.chronicle-page .mobile-nav a { border-color: var(--chronicle-line); color: var(--chronicle-soft); }
.chronicle-page .site-footer { border-top-color: var(--chronicle-line); background: #05080d; }

.timeline-stage { min-height: 100vh; font-family: var(--sans); }
.timeline-masthead {
  width: min(100%, calc(var(--max) + var(--gutter) * 2));
  min-height: 270px;
  margin: 0 auto;
  padding: clamp(44px, 5vw, 68px) var(--gutter) 42px;
}
.timeline-title { display: flex; align-items: flex-end; justify-content: space-between; gap: 36px; }
.timeline-title h1 { margin: 0; font: 600 clamp(38px, 4.6vw, 62px)/1.08 var(--sans); letter-spacing: -.05em; }
.timeline-title p { margin: 0 0 8px; display: flex; gap: 22px; color: var(--chronicle-muted); font: 500 11px/1 var(--mono); letter-spacing: .04em; }
.timeline-title p span + span { position: relative; }
.timeline-title p span + span::before { position: absolute; top: 50%; left: -12px; width: 2px; height: 2px; border-radius: 50%; background: var(--chronicle-muted); content: ''; }

.timeline-overview { margin-top: clamp(42px, 5vw, 60px); }
.overview-rail { position: relative; height: 70px; margin: 0 6px; }
.overview-base, .overview-progress { position: absolute; top: 16px; left: 0; height: 2px; }
.overview-base { width: 100%; background: var(--chronicle-line-strong); }
.overview-progress { width: calc(var(--chronology-progress, 0) * 100%); background: linear-gradient(90deg, var(--chronicle-blue), var(--chronicle-cyan)); box-shadow: 0 0 18px rgba(94, 216, 255, .32); transition: width 220ms ease-out; }
.overview-tick { position: absolute; top: 9px; left: var(--position); height: 22px; transform: translateX(-50%); }
.overview-tick i { width: 1px; height: 14px; background: var(--chronicle-line-strong); display: block; }
.overview-tick b { position: absolute; top: 30px; left: 50%; color: var(--chronicle-muted); font: 400 10px/1 var(--mono); transform: translateX(-50%); }
.overview-event { position: absolute; z-index: 2; top: 11px; left: var(--position); width: 11px; height: 11px; border: 2px solid var(--chronicle-bg); border-radius: 50%; background: var(--chronicle-blue); box-shadow: 0 0 0 1px rgba(77, 120, 255, .55); transform: translateX(-50%); transition: width 160ms ease, height 160ms ease, top 160ms ease, background 160ms ease; }
.overview-event-s { background: var(--chronicle-red); box-shadow: 0 0 0 1px rgba(240, 100, 88, .65); }
.overview-event-b { background: #6d7c90; box-shadow: 0 0 0 1px rgba(109, 124, 144, .5); }
.overview-event[hidden] { display: none; }

.timeline-explorer {
  width: min(100%, calc(var(--max) + var(--gutter) * 2));
  margin: 0 auto;
  padding: 0 var(--gutter) 130px;
}
.timeline-toolbar {
  position: sticky;
  top: 76px;
  z-index: 20;
  min-height: 62px;
  padding: 10px 0;
  border-top: 1px solid var(--chronicle-line);
  border-bottom: 1px solid var(--chronicle-line);
  background: rgba(7, 11, 18, .92);
  backdrop-filter: blur(18px);
  display: grid;
  grid-template-columns: 128px minmax(210px, 1fr) auto minmax(160px, 210px) auto;
  align-items: center;
  gap: 14px;
}
.timeline-count { display: flex; align-items: center; gap: 10px; color: var(--chronicle-soft); font: 500 11px/1 var(--mono); }
.timeline-count i { width: 5px; height: 5px; border-radius: 50%; background: var(--chronicle-cyan); box-shadow: 0 0 12px rgba(94, 216, 255, .65); }
.timeline-search { height: 40px; padding: 0 13px; border: 1px solid var(--chronicle-line); display: flex; align-items: center; gap: 9px; color: var(--chronicle-muted); transition: border-color 160ms ease, background 160ms ease; }
.timeline-search:focus-within { border-color: var(--chronicle-blue); background: var(--chronicle-surface); color: var(--chronicle-soft); }
.timeline-search input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--chronicle-text); font-size: 13px; }
.timeline-search input::placeholder { color: var(--chronicle-muted); }
.level-controls { height: 40px; border: 1px solid var(--chronicle-line); display: flex; }
.level-controls button { min-width: 42px; padding: 0 12px; border: 0; border-right: 1px solid var(--chronicle-line); background: transparent; color: var(--chronicle-muted); cursor: pointer; font: 500 11px var(--mono); }
.level-controls button { white-space: nowrap; }
.level-controls button[data-level='all'] { min-width: 54px; }
.level-controls button:last-child { border-right: 0; }
.level-controls button:hover { color: var(--chronicle-text); }
.level-controls button[aria-pressed='true'] { background: #315fda; color: #fff; }
.topic-select select { width: 100%; height: 40px; padding: 0 34px 0 12px; border: 1px solid var(--chronicle-line); border-radius: 0; outline: 0; background: var(--chronicle-bg); color: var(--chronicle-soft); font-size: 12px; }
.topic-select select:focus { border-color: var(--chronicle-blue); }
.reset-filter { padding: 0 4px; border: 0; background: transparent; color: var(--chronicle-cyan); cursor: pointer; font-size: 12px; }
.reset-filter[hidden] { display: none; }

.timeline-stream {
  --year-column: 150px;
  --axis-column: 72px;
  position: relative;
  padding: 64px 0 30px;
}
.timeline-axis { position: absolute; z-index: 0; top: 64px; bottom: 0; left: calc(var(--year-column) + var(--axis-column) / 2); width: 2px; background: var(--chronicle-line); overflow: hidden; }
.timeline-axis > i { position: absolute; inset: 0; background: linear-gradient(var(--chronicle-blue), var(--chronicle-cyan)); box-shadow: 0 0 18px rgba(94, 216, 255, .2); transform: scaleY(var(--timeline-progress, 0)); transform-origin: top; will-change: transform; }
.timeline-year { position: relative; display: grid; grid-template-columns: var(--year-column) var(--axis-column) minmax(0, 1fr); padding-bottom: clamp(62px, 7vw, 92px); }
.timeline-year[hidden] { display: none; }
.timeline-year-label { position: relative; z-index: 2; align-self: start; grid-column: 1; padding-top: 18px; }
.timeline-year-label a { display: inline-flex; flex-direction: column; gap: 8px; }
.timeline-year-label span { color: var(--chronicle-text); font: 500 clamp(24px, 2.5vw, 34px)/1 var(--mono); letter-spacing: -.055em; }
.timeline-year-label small { color: var(--chronicle-muted); font: 400 10px/1 var(--sans); }
.timeline-year-node { position: relative; z-index: 2; grid-column: 2; }
.timeline-year-node::after { position: absolute; top: 29px; left: 50%; width: 50%; height: 1px; background: var(--chronicle-line-strong); content: ''; }
.timeline-year-node i { position: absolute; top: 21px; left: 50%; width: 17px; height: 17px; border: 4px solid var(--chronicle-bg); background: var(--chronicle-blue); box-shadow: 0 0 0 1px var(--chronicle-blue), 0 0 18px rgba(77, 120, 255, .35); transform: translateX(-50%) rotate(45deg); }
.timeline-year.is-current .timeline-year-label span { color: var(--chronicle-cyan); }
.timeline-year.is-current .timeline-year-node i { background: var(--chronicle-cyan); box-shadow: 0 0 0 1px var(--chronicle-cyan), 0 0 22px rgba(94, 216, 255, .48); }
.timeline-year-events { min-width: 0; grid-column: 3; border-top: 1px solid var(--chronicle-line); }
.event-row { position: relative; }
.event-row[hidden] { display: none; }
.event-row-link { position: relative; min-height: 112px; padding: 24px 12px 28px 0; border-bottom: 1px solid var(--chronicle-line); display: grid; grid-template-columns: 92px minmax(0, 1fr) 32px; gap: 22px; align-items: start; transition: background 180ms ease, padding 180ms ease; }
.event-row-link::before { position: absolute; top: 29px; left: calc(var(--axis-column) / -2); width: calc(var(--axis-column) / 2); height: 1px; background: var(--chronicle-line-strong); content: ''; transition: background 160ms ease; }
.event-row-link:hover { padding-right: 18px; padding-left: 12px; background: linear-gradient(90deg, rgba(77, 120, 255, .095), transparent 78%); }
.event-row-link:hover::before { background: var(--chronicle-blue); }
.event-node { position: absolute; z-index: 2; top: 24px; left: calc(var(--axis-column) / -2 - 5px); width: 11px; height: 11px; border: 3px solid var(--chronicle-bg); border-radius: 50%; background: var(--chronicle-muted); box-shadow: 0 0 0 1px var(--chronicle-line-strong); transition: background 160ms ease, box-shadow 160ms ease; }
.event-row:first-child .event-node { display: none; }
.event-row-link:hover .event-node { background: var(--chronicle-cyan); box-shadow: 0 0 0 1px var(--chronicle-cyan), 0 0 14px rgba(94, 216, 255, .5); }
.event-row-link > time { padding-top: 3px; color: var(--chronicle-muted); font: 400 12px/1.4 var(--mono); }
.event-title-wrap { min-width: 0; display: block; }
.event-title-line { display: flex; align-items: baseline; gap: 12px; }
.event-title-line h2 { margin: 0; color: var(--chronicle-text); font: 600 clamp(19px, 1.8vw, 24px)/1.38 var(--sans); letter-spacing: -.03em; transition: color 160ms ease; }
.event-row-link:hover h2 { color: #fff; }
.event-level { flex: none; width: 20px; height: 20px; border: 1px solid var(--chronicle-line-strong); border-radius: 50%; display: grid; place-items: center; color: var(--chronicle-muted); font: 500 9px/1 var(--mono); }
.event-level-s { border-color: rgba(240, 100, 88, .65); color: var(--chronicle-red); }
.event-level-a { border-color: rgba(77, 120, 255, .7); color: #8da8ff; }
.event-summary { max-width: 760px; margin-top: 8px; display: -webkit-box; overflow: hidden; color: var(--chronicle-soft); font-size: 14px; line-height: 1.7; -webkit-box-orient: vertical; -webkit-line-clamp: 1; }
.event-arrow { align-self: center; color: var(--chronicle-muted); opacity: 0; transform: translateX(-8px); transition: color 160ms ease, opacity 160ms ease, transform 160ms ease; }
.event-row-link:hover .event-arrow, .event-row-link:focus-visible .event-arrow { color: var(--chronicle-cyan); opacity: 1; transform: translateX(0); }
.chronicle-page .empty-state { padding: 100px 0; border-top: 1px solid var(--chronicle-line); text-align: center; }
.chronicle-page .empty-state h2 { margin: 0; color: var(--chronicle-text); font: 600 24px var(--sans); }
.chronicle-page .empty-state button { margin-top: 18px; padding: 8px 12px; border: 1px solid var(--chronicle-line-strong); background: transparent; color: var(--chronicle-cyan); cursor: pointer; }
.event-tags, .aside-tags { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 7px; }
.tag, .aside-tags a { padding: 5px 9px; border: 1px solid var(--line); background: rgba(255,255,255,.25); color: var(--ink-soft); font-size: 10px; }
a.tag:hover, .aside-tags a:hover { border-color: var(--blue); color: var(--blue); }
.tag-muted { color: var(--muted); }
.empty-state { padding: 100px 0; text-align: center; }
.empty-state h2 { margin: 0; font: 700 32px var(--serif); }
.empty-state p { color: var(--muted); }

.breadcrumbs { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; color: var(--muted); font: 500 10px var(--mono); letter-spacing: .06em; }
.breadcrumbs a:hover { color: var(--blue); }
.event-article, .definition-article, .company-article, .about-page-content { width: min(100%, calc(var(--max) + var(--gutter) * 2)); margin: 0 auto; padding: 68px var(--gutter) 120px; }
.event-header { padding-bottom: 68px; border-bottom: 1px solid var(--line); }
.event-title-grid { margin-top: 48px; display: grid; grid-template-columns: minmax(0, 1fr) 150px; gap: 60px; align-items: end; }
.event-kicker { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; }
.event-kicker time { color: var(--red); font: 500 11px var(--mono); }
.event-title-grid h1 { max-width: 900px; margin: 20px 0 0; font: 900 clamp(44px, 5.8vw, 72px)/1.1 var(--serif); letter-spacing: -0.052em; }
.event-subtitle { max-width: 760px; margin: 18px 0 0; color: var(--ink-soft); font: 600 18px/1.7 var(--serif); }
.event-stamp { width: 132px; height: 132px; border: 1px solid var(--red); color: var(--red); display: flex; flex-direction: column; align-items: center; justify-content: center; transform: rotate(2deg); }
.event-stamp span { font: 700 14px var(--serif); }
.event-stamp b { margin: 4px 0 -2px; font: 500 28px var(--mono); }
.event-stamp small { font-size: 9px; }
.event-body-grid { padding: 78px 0 90px; display: grid; grid-template-columns: minmax(0, 760px) 250px; justify-content: space-between; gap: 80px; }
.lead-summary { padding: 30px 0 32px 28px; border-left: 4px solid var(--blue); }
.lead-summary span { color: var(--blue); font: 500 10px var(--mono); letter-spacing: .1em; }
.lead-summary p { margin: 10px 0 0; font: 700 19px/1.78 var(--serif); }
.prose-section { position: relative; margin-top: 78px; padding-top: 26px; border-top: 1px solid var(--line); }
.prose-section .section-number { position: absolute; top: 34px; left: -58px; }
.prose-section h2, .impact-section h2, .source-section h2 { margin: 0; font: 800 29px/1.35 var(--serif); letter-spacing: -0.03em; }
.prose-section p { margin: 22px 0 0; color: var(--ink-soft); font: 500 17px/1.92 var(--serif); }
.why-section { border-top-color: var(--blue); }
.why-section p { font-size: 18px; color: var(--ink); }
.before-after-section { margin-top: 78px; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); display: grid; grid-template-columns: 1fr 1fr; }
.before-after-section > div { min-height: 220px; padding: 28px; }
.before-after-section > div + div { border-left: 1px solid var(--ink); background: var(--yellow); }
.before-after-section span { color: var(--red); font: 500 10px var(--mono); letter-spacing: .1em; }
.before-after-section p { margin: 24px 0 0; font: 700 16px/1.8 var(--serif); }
.impact-section, .source-section { margin-top: 86px; }
.inline-heading { display: grid; grid-template-columns: 54px 1fr; align-items: start; }
.impact-list { margin-top: 34px; border-top: 2px solid var(--ink); }
.impact-list > div { padding: 24px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 120px 1fr; gap: 28px; }
.impact-list span { color: var(--blue); font: 500 11px var(--mono); }
.impact-list p { margin: 0; color: var(--ink-soft); font: 500 16px/1.85 var(--serif); }
.source-list { margin: 34px 0 0; padding: 0; border-top: 2px solid var(--ink); list-style: none; }
.source-list li { min-height: 78px; padding: 14px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 40px 1fr 24px; gap: 14px; align-items: center; }
.source-list li > span { color: var(--muted); font: 500 9px var(--mono); }
.source-list b, .source-list small { display: block; }
.source-list b { font: 700 14px/1.4 var(--serif); }
.source-list small { margin-top: 5px; color: var(--muted); font-size: 10px; text-transform: uppercase; }
.source-list li:hover b { color: var(--blue); }
.source-empty { margin-top: 32px; padding: 24px; border: 1px solid var(--red); color: var(--red); }
.source-empty p { margin: 6px 0 0; font-size: 12px; }
.event-aside { align-self: start; position: sticky; top: 110px; border-top: 2px solid var(--ink); }
.aside-block { padding: 22px 0; border-bottom: 1px solid var(--line); }
.aside-block > span { display: block; color: var(--muted); font: 500 9px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.aside-tags { margin-top: 12px; }
.aside-links { margin-top: 10px; }
.aside-links a { padding: 9px 0; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 10px; font: 700 13px var(--serif); }
.aside-links a:hover { color: var(--blue); }
.aside-status p { display: flex; align-items: center; gap: 8px; margin: 12px 0 4px; font-size: 12px; font-weight: 600; }
.aside-status small { color: var(--muted); font-size: 10px; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--red); }
.status-dot.verified { background: var(--green); }
.related-events { padding: 72px 0; border-top: 1px solid var(--line); }
.related-events > div:last-child { border-top: 2px solid var(--ink); display: grid; grid-template-columns: repeat(3, 1fr); }
.related-events > div:last-child a { min-height: 150px; padding: 22px; border-right: 1px solid var(--line); display: flex; flex-direction: column; }
.related-events > div:last-child a:last-child { border-right: 0; }
.related-events time { color: var(--red); font: 500 10px var(--mono); }
.related-events h3 { margin: auto 0 0; font: 700 17px/1.5 var(--serif); }
.related-events a svg { align-self: flex-end; margin-top: 14px; }
.related-events a:hover { background: var(--yellow); }
.event-pagination { border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 1fr; }
.event-pagination a { min-height: 130px; padding: 28px 0; display: flex; flex-direction: column; justify-content: center; }
.event-pagination .next { padding-left: 36px; border-left: 1px solid var(--line); text-align: right; }
.event-pagination span { color: var(--muted); font: 500 9px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.event-pagination b { margin-top: 8px; font: 700 17px var(--serif); }
.event-pagination a:hover b { color: var(--blue); }

.index-toolbar { width: min(100%, calc(var(--max) + var(--gutter) * 2)); margin: 0 auto; padding: 48px var(--gutter) 22px; display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.index-toolbar .inline-search { width: 320px; }
.index-filter { display: flex; gap: 6px; }
.index-filter button { padding: 8px 13px; border: 1px solid var(--line); border-radius: 0; background: transparent; cursor: pointer; font-size: 11px; }
.index-filter button[aria-pressed='true'] { border-color: var(--ink); background: var(--ink); color: var(--white); }
.concept-index, .company-index, .topic-directory { width: min(100%, calc(var(--max) + var(--gutter) * 2)); margin: 0 auto; padding: 0 var(--gutter) 120px; }
.concept-index { border-top: 2px solid var(--ink); }
.concept-index > a { min-height: 110px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 48px 230px minmax(0, 1fr) 90px 24px; gap: 24px; align-items: center; }
.concept-index > a[hidden] { display: none; }
.concept-index > a > span { color: var(--muted); font: 500 10px var(--mono); }
.concept-index h2 { margin: 0; font: 700 21px var(--serif); }
.concept-index small { color: var(--muted); font-size: 10px; }
.concept-index p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.concept-index > a > b { color: var(--blue); font: 500 9px var(--mono); text-transform: uppercase; }
.concept-index > a:hover { background: var(--yellow); padding: 0 16px; }
.company-index, .topic-directory { padding-top: 56px; display: grid; grid-template-columns: repeat(3, 1fr); }
.company-index > a, .topic-directory > a { min-height: 270px; padding: 28px; border-top: 2px solid var(--ink); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); display: flex; flex-direction: column; }
.company-index > a:nth-child(3n), .topic-directory > a:nth-child(3n) { border-right: 0; }
.company-index > a > span, .topic-directory > a > span { color: var(--muted); font: 500 10px var(--mono); }
.company-index h2, .topic-directory h2 { margin: auto 0 10px; font: 800 28px var(--serif); }
.company-index p, .topic-directory p { margin: 0; color: var(--muted); font-size: 12px; }
.company-index small { margin-top: 18px; color: var(--red); font: 500 10px var(--mono); }
.company-index svg, .topic-directory svg { align-self: flex-end; margin-top: 18px; }
.company-index > a:hover, .topic-directory > a:hover { background: var(--yellow); }

.definition-article > header { max-width: 950px; padding: 20px 0 74px; }
.definition-article h1 { margin: 44px 0 0; font: 900 clamp(50px, 6.2vw, 80px)/1.04 var(--serif); letter-spacing: -0.058em; }
.definition-full-name { margin: 18px 0 0; color: var(--muted); font: 500 13px var(--mono); }
.definition-one-liner { max-width: 780px; margin: 28px 0 0; font: 700 20px/1.75 var(--serif); }
.definition-grid { padding: 68px 0 40px; border-top: 1px solid var(--line); display: grid; grid-template-columns: minmax(0, 760px) 220px; justify-content: space-between; gap: 80px; }
.definition-aside { align-self: start; position: sticky; top: 110px; border-top: 2px solid var(--ink); }
.definition-aside > span { display: block; margin-top: 20px; color: var(--muted); font: 500 9px var(--mono); text-transform: uppercase; }
.definition-aside > b { display: block; margin-top: 5px; color: var(--blue); font: 700 15px var(--serif); }
.definition-aside a { padding: 9px 0; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; font: 700 13px var(--serif); }
.misunderstanding-section { margin-top: 76px; padding: 30px; border: 1px solid var(--red); }
.misunderstanding-section h2 { margin: 0 0 20px; color: var(--red); font: 700 22px var(--serif); }
.misunderstanding-section p { margin: 10px 0 0; font-size: 14px; }

.company-article > header { padding: 30px 0 80px; }
.company-title { margin-top: 50px; display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.company-title h1 { margin: 0; font: 900 clamp(50px, 6.4vw, 80px)/1.02 var(--serif); letter-spacing: -0.058em; }
.company-title span { color: var(--red); font: 500 20px var(--mono); }
.company-article > header > p { max-width: 760px; margin: 30px 0 0; font: 600 18px/1.8 var(--serif); }
.company-route { padding: 60px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; }
.company-route h2 { margin: 8px 0 0; font: 800 42px var(--serif); }
.company-route > div:last-child { border-top: 2px solid var(--ink); }
.company-route a { min-height: 60px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; font: 700 16px var(--serif); }
.company-route a:hover { color: var(--blue); }

.topic-hero { width: min(100%, calc(var(--max) + var(--gutter) * 2)); margin: 0 auto; padding: 70px var(--gutter) 80px; }
.topic-hero h1 { margin: 46px 0 0; font: 900 clamp(48px, 6vw, 78px)/1.08 var(--serif); letter-spacing: -0.055em; }
.topic-hero > p { max-width: 760px; margin: 26px 0 0; color: var(--ink-soft); font: 600 17px/1.85 var(--serif); }
.topic-timeline { width: min(100%, calc(var(--max) + var(--gutter) * 2)); margin: 0 auto; padding: 0 var(--gutter) 120px; border-top: 2px solid var(--ink); }
.topic-timeline > a { min-height: 150px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 45px 150px minmax(0, 1fr) 110px 24px; gap: 24px; align-items: center; }
.topic-timeline > a > span { color: var(--muted); font: 500 9px var(--mono); }
.topic-timeline time { color: var(--red); font: 500 11px var(--mono); }
.topic-timeline h2 { margin: 0; font: 700 24px var(--serif); }
.topic-timeline p { margin: 8px 0 0; color: var(--muted); font-size: 12px; }
.topic-timeline > a:hover { padding: 0 14px; background: var(--yellow); }
.topic-timeline.is-empty { min-height: 330px; display: grid; place-items: center; }
.topic-empty { max-width: 520px; text-align: center; }
.topic-empty h2 { margin: 0; font: 800 34px var(--serif); }
.topic-empty p { margin: 12px 0 0; color: var(--muted); }

.about-page-content { max-width: 980px; }
.about-page-content header { padding: 30px 0 90px; }
.about-page-content header h1 { margin: 40px 0 0; font: 900 clamp(42px, 5.6vw, 64px)/1.24 var(--serif); letter-spacing: -0.05em; }
.about-page-content > section { position: relative; padding: 54px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 260px 1fr; gap: 55px; }
.about-page-content section > .section-number { position: absolute; top: 62px; left: -58px; }
.about-page-content h2 { margin: 0; font: 800 28px var(--serif); }
.about-page-content section > p, .about-page-content ul { margin: 0; color: var(--ink-soft); font: 500 17px/1.95 var(--serif); }
.about-page-content ul { padding-left: 1.2em; }
.editorial-levels { display: grid; }
.editorial-levels p { margin: 0; padding: 18px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 45px 90px 1fr; gap: 16px; font-size: 13px; }
.editorial-levels b { color: var(--red); font: 600 16px var(--mono); }
.editorial-levels span { font-weight: 700; }

.not-found { min-height: 650px; padding: 100px var(--gutter); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.not-found > span { color: var(--red); font: 500 12px var(--mono); }
.not-found h1 { margin: 22px 0 0; font: 900 clamp(42px, 6vw, 72px)/1.25 var(--serif); }
.not-found p { color: var(--muted); }
.not-found .button { margin-top: 20px; }

.site-footer { border-top: 1px solid var(--ink); background: var(--ink); color: var(--white); }
.footer-main, .footer-meta { width: min(100%, calc(var(--max) + var(--gutter) * 2)); margin: 0 auto; padding-right: var(--gutter); padding-left: var(--gutter); }
.footer-main { min-height: 220px; padding-top: 54px; padding-bottom: 54px; display: flex; align-items: flex-start; justify-content: space-between; gap: 50px; }
.footer-brand { font: 800 32px var(--serif); }
.footer-main p { margin: 12px 0 0; color: #aaa89f; font-size: 13px; }
.footer-links { display: grid; grid-template-columns: repeat(2, minmax(130px, 1fr)); gap: 10px 40px; }
.footer-links a { padding: 7px 0; color: #d2d0c7; font-size: 12px; }
.footer-links a:hover { color: var(--yellow); }
.footer-links .external-footer-link { display: inline-flex; align-items: center; gap: 7px; }
.footer-meta { padding-top: 16px; padding-bottom: 16px; border-top: 1px solid #44433e; display: flex; justify-content: space-between; color: #8f8d84; font: 500 9px var(--mono); letter-spacing: .08em; }

.search-dialog { width: min(720px, calc(100vw - 32px)); max-height: min(720px, calc(100vh - 50px)); padding: 0; border: 0; background: transparent; color: var(--ink); overflow: visible; }
.search-dialog::backdrop { background: rgba(23,23,20,.68); backdrop-filter: blur(5px); }
.search-panel { border: 1px solid var(--ink); background: var(--paper); box-shadow: 10px 10px 0 var(--blue); }
.search-field-wrap { height: 68px; padding: 0 18px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 12px; }
.search-field-wrap input { flex: 1; border: 0; outline: 0; background: transparent; font: 600 16px var(--serif); }
.search-field-wrap button { padding: 4px 6px; border: 1px solid var(--line); background: transparent; color: var(--muted); cursor: pointer; font: 500 9px var(--mono); }
.search-hint { padding: 22px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.search-hint p { width: 100%; margin: 0 0 4px; color: var(--muted); font: 500 9px var(--mono); text-transform: uppercase; }
.search-hint button { padding: 6px 9px; border: 1px solid var(--line); background: transparent; cursor: pointer; font-size: 10px; }
.search-results { max-height: 520px; overflow-y: auto; }
.search-result { min-height: 78px; padding: 14px 18px; border-top: 1px solid var(--line); display: grid; grid-template-columns: 50px 1fr 20px; gap: 14px; align-items: center; }
.search-result > span { color: var(--red); font: 500 9px var(--mono); }
.search-result b { display: block; font: 700 14px var(--serif); }
.search-result small { display: block; margin-top: 4px; color: var(--muted); font-size: 10px; }
.search-result:hover { background: var(--yellow); }
.search-empty { padding: 60px 22px; color: var(--muted); text-align: center; font-size: 13px; }

@keyframes rise-in {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero-copy, .hero-chronology, .page-intro > *, .event-header > * { animation: rise-in 620ms ease both; }
.hero-chronology, .page-intro > *:last-child { animation-delay: 100ms; }

@media (max-width: 1020px) {
  .desktop-nav { display: none; }
  .menu-trigger { display: block; }
  .mobile-nav { position: absolute; top: 76px; right: 0; left: 0; padding: 12px var(--gutter) 20px; border-bottom: 1px solid var(--line); background: var(--paper); }
  .mobile-nav.is-open { display: grid; grid-template-columns: repeat(6, 1fr); }
  .mobile-nav a { padding: 12px; border-right: 1px solid var(--line); text-align: center; font-size: 12px; }
  .mobile-nav .external-nav-link { display: flex; align-items: center; justify-content: center; gap: 7px; }
  .home-hero { grid-template-columns: 1fr; gap: 72px; }
  .home-hero::before { display: none; }
  .hero-copy h1 { max-width: 780px; }
  .hero-chronology { max-width: 700px; }
  .topic-index { grid-template-columns: repeat(2, 1fr); }
  .topic-index a:nth-child(2) { border-right: 0; }
  .topic-index a { border-bottom: 1px solid #55534b; }
  .learning-path { grid-template-columns: 1fr; }
  .learning-path::before { top: 20px; bottom: 20px; left: 24px; width: 1px; height: auto; }
  .learning-path a { min-height: 150px; padding: 16px 0 16px 84px !important; }
  .learning-path a > span { position: absolute; left: 0; }
  .learning-path time { margin-top: 0; }
  .learning-path h3 { min-height: 0; }
  .timeline-toolbar { grid-template-columns: 104px minmax(190px, 1fr) auto minmax(150px, 180px) auto; }
  .timeline-stream { --year-column: 112px; --axis-column: 58px; }
  .event-body-grid, .definition-grid { grid-template-columns: minmax(0, 1fr) 220px; gap: 50px; }
  .related-events > div:last-child { grid-template-columns: repeat(2, 1fr); }
  .company-index, .topic-directory { grid-template-columns: repeat(2, 1fr); }
  .company-index > a:nth-child(3n), .topic-directory > a:nth-child(3n) { border-right: 1px solid var(--line); }
  .company-index > a:nth-child(2n), .topic-directory > a:nth-child(2n) { border-right: 0; }
}

@media (max-width: 760px) {
  :root { --gutter: 20px; }
  body { background-size: 100% 28px; }
  .header-inner { height: 66px; }
  .brand small, .search-trigger span, .search-trigger kbd { display: none; }
  .search-trigger { width: 40px; justify-content: center; padding: 0; border: 0; }
  .mobile-nav { top: 66px; }
  .mobile-nav.is-open { grid-template-columns: 1fr; }
  .mobile-nav a { border-right: 0; border-bottom: 1px solid var(--line); text-align: left; }
  .mobile-nav .external-nav-link { justify-content: space-between; }
  .home-hero { min-height: 0; padding-top: 72px; padding-bottom: 70px; gap: 54px; }
  .hero-copy h1 { font-size: clamp(43px, 13vw, 62px); line-height: 1.15; }
  .hero-copy > p { margin-top: 24px; font-size: 16px; line-height: 1.8; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-chronology a { grid-template-columns: 54px 1fr; }
  .hero-index { display: none; }
  .section, .topic-band { padding-top: 78px; padding-bottom: 78px; }
  .split-heading, .page-intro { grid-template-columns: 1fr; gap: 26px; }
  .split-heading > div { grid-template-columns: 30px 1fr; gap: 10px; }
  .section-heading { margin-bottom: 36px; }
  .section-heading h2 { font-size: 34px; }
  .turning-item { min-height: 132px; grid-template-columns: 36px 50px 1fr 18px; gap: 10px; }
  .turning-item:hover { padding: 0 8px; }
  .turning-item h3 { font-size: 18px; }
  .turning-item p { display: none; }
  .topic-index { grid-template-columns: 1fr; }
  .topic-index a { min-height: 190px; border-right: 0; }
  .recent-list article { grid-template-columns: 1fr; gap: 12px; }
  .page-intro { min-height: 320px; padding-top: 72px; padding-bottom: 52px; }
  .page-intro h1 { font-size: 46px; }
  .page-intro > p { font-size: 15px; }
  .timeline-masthead { min-height: 236px; padding-top: 42px; padding-bottom: 30px; }
  .timeline-title { align-items: flex-start; flex-direction: column; gap: 18px; }
  .timeline-title h1 { font-size: clamp(36px, 10vw, 46px); }
  .timeline-title p { margin: 0; }
  .timeline-overview { margin-top: 38px; }
  .overview-rail { height: 48px; margin: 0 4px; }
  .overview-tick b { display: none; }
  .timeline-explorer { padding-bottom: 90px; }
  .timeline-toolbar { position: relative; top: auto; grid-template-columns: 1fr auto; gap: 8px; padding: 12px 0; }
  .timeline-count { grid-column: 1; grid-row: 1; }
  .timeline-search { grid-column: 1 / -1; grid-row: 2; }
  .level-controls { grid-column: 1; grid-row: 3; height: 38px; justify-self: start; }
  .level-controls button { min-width: 38px; padding: 0 10px; border: 0; border-right: 1px solid var(--chronicle-line); }
  .topic-select { grid-column: 2; grid-row: 3; min-width: 142px; }
  .timeline-toolbar > .reset-filter { grid-column: 2; grid-row: 1; justify-self: end; }
  .timeline-stream { --year-column: 54px; --axis-column: 34px; padding-top: 48px; }
  .timeline-axis { top: 48px; }
  .timeline-year { padding-bottom: 54px; }
  .timeline-year-label { padding-top: 18px; }
  .timeline-year-label span { font-size: 16px; letter-spacing: -.04em; }
  .timeline-year-label small { display: none; }
  .timeline-year-node::after { top: 24px; }
  .timeline-year-node i { top: 18px; width: 13px; height: 13px; border-width: 3px; }
  .event-row-link { min-height: 88px; padding: 19px 4px 20px 0; grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .event-row-link::before { top: 24px; }
  .event-row-link:hover { padding-right: 4px; padding-left: 0; }
  .event-node { top: 19px; }
  .event-row-link > time { grid-column: 1; grid-row: 1; padding: 0; font-size: 10px; }
  .event-title-wrap { grid-column: 1; grid-row: 2; }
  .event-title-line { gap: 8px; }
  .event-title-line h2 { font-size: 18px; line-height: 1.4; }
  .event-level { width: 18px; height: 18px; font-size: 8px; }
  .event-summary { display: none; }
  .event-arrow { display: none; }
  .event-title-grid { grid-template-columns: 1fr; gap: 32px; }
  .event-header { padding-bottom: 42px; }
  .event-title-grid { margin-top: 32px; }
  .event-stamp { display: none; }
  .event-title-grid h1 { font-size: 43px; }
  .event-subtitle { font-size: 16px; }
  .event-body-grid, .definition-grid { padding-top: 42px; grid-template-columns: 1fr; }
  .event-aside, .definition-aside { position: static; }
  .prose-section .section-number { position: static; display: block; margin-bottom: 12px; }
  .prose-section h2, .impact-section h2, .source-section h2 { font-size: 26px; }
  .prose-section p { font-size: 16px; }
  .why-section p { font-size: 17px; }
  .before-after-section { grid-template-columns: 1fr; }
  .before-after-section > div + div { border-top: 1px solid var(--ink); border-left: 0; }
  .impact-list > div { grid-template-columns: 90px 1fr; }
  .related-events > div:last-child { grid-template-columns: 1fr; }
  .related-events > div:last-child a { border-right: 0; border-bottom: 1px solid var(--line); }
  .event-pagination { grid-template-columns: 1fr; }
  .event-pagination .next { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; text-align: left; }
  .index-toolbar { align-items: stretch; flex-direction: column; }
  .index-toolbar .inline-search { width: 100%; }
  .index-filter { overflow-x: auto; }
  .concept-index > a { min-height: 130px; grid-template-columns: 30px 1fr 20px; gap: 12px; }
  .concept-index > a > p, .concept-index > a > b { display: none; }
  .company-index, .topic-directory { grid-template-columns: 1fr; }
  .company-index > a, .topic-directory > a { min-height: 230px; border-right: 0 !important; }
  .definition-article h1, .company-title h1 { font-size: 46px; }
  .definition-one-liner, .company-article > header > p { font-size: 18px; }
  .company-title { align-items: flex-start; flex-direction: column; }
  .company-route { grid-template-columns: 1fr; gap: 30px; }
  .topic-hero h1 { font-size: 46px; }
  .topic-timeline > a { min-height: 170px; padding: 22px 0; grid-template-columns: 30px 1fr 20px; gap: 10px; }
  .topic-timeline time { grid-column: 2; }
  .topic-timeline > a > div { grid-column: 2; }
  .topic-timeline .importance { display: none; }
  .topic-timeline > a > svg { grid-column: 3; grid-row: 1 / span 3; }
  .about-page-content > section { grid-template-columns: 1fr; gap: 22px; }
  .about-page-content section > .section-number { position: static; }
  .editorial-levels p { grid-template-columns: 35px 75px 1fr; }
  .footer-main { min-height: 0; flex-direction: column; }
  .footer-links { grid-template-columns: 1fr; }
  .footer-meta { gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Unified theme system */
.chronicle-page {
  --chronicle-bg: var(--bg);
  --chronicle-surface: var(--surface);
  --chronicle-surface-2: var(--surface-2);
  --chronicle-text: var(--text);
  --chronicle-soft: var(--text-soft);
  --chronicle-muted: var(--text-muted);
  --chronicle-line: var(--border);
  --chronicle-line-strong: var(--border-strong);
  --chronicle-blue: var(--accent);
  --chronicle-cyan: var(--cyan);
  --chronicle-red: var(--danger);
  background:
    linear-gradient(color-mix(in srgb, var(--text) 3.5%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--text) 2.5%, transparent) 1px, transparent 1px),
    var(--bg);
  background-size: 100% 40px, 40px 100%, auto;
}

.chronicle-page::before,
body::before { background: radial-gradient(circle at 50% -10%, color-mix(in srgb, var(--accent) 17%, transparent), transparent 38%); }

.site-header,
.chronicle-page .site-header {
  border-bottom-color: var(--border);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
}
.site-header.is-scrolled,
.chronicle-page .site-header.is-scrolled { box-shadow: var(--shadow); }
.site-footer,
.chronicle-page .site-footer { border-top-color: var(--border); background: var(--surface); color: var(--text); }
.footer-main p, .footer-links a, .footer-meta { color: var(--text-muted); }
.footer-meta { border-top-color: var(--border); }
.footer-links a:hover { color: var(--accent); }

.brand-mark i:first-child,
.chronicle-page .brand-mark i:first-child { background: var(--text); }
.brand strong,
.chronicle-page .brand strong { color: var(--text); }
.brand small,
.chronicle-page .brand small { color: var(--text-muted); }
.desktop-nav a,
.chronicle-page .desktop-nav a { color: var(--text-soft); }
.desktop-nav a[aria-current='page'],
.chronicle-page .desktop-nav a[aria-current='page'] { color: var(--text); }
.desktop-nav a::after,
.chronicle-page .desktop-nav a::after { background: var(--accent); }

.header-actions { gap: 7px; }
.utility-trigger {
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: color-mix(in srgb, var(--surface) 58%, transparent);
  color: var(--text-soft);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}
.utility-trigger:hover { border-color: var(--accent); background: var(--surface-2); color: var(--text); }
.language-trigger { width: 42px; font: 500 10px/1 var(--mono); letter-spacing: .04em; }
.theme-icon { grid-area: 1 / 1; }
.theme-icon svg { width: 17px; height: 17px; }
html[data-theme='dark'] .theme-icon-moon,
html[data-theme='light'] .theme-icon-sun { display: none; }

.search-trigger,
.chronicle-page .search-trigger {
  border-color: var(--border);
  background: color-mix(in srgb, var(--surface) 58%, transparent);
  color: var(--text-soft);
}
.search-trigger:hover,
.chronicle-page .search-trigger:hover { border-color: var(--accent); background: var(--surface-2); color: var(--text); }
.search-trigger kbd,
.chronicle-page .search-trigger kbd { border-color: var(--border-strong); color: var(--text-muted); }
.mobile-nav,
.chronicle-page .mobile-nav { border-bottom-color: var(--border); background: var(--bg); }
.mobile-nav a,
.chronicle-page .mobile-nav a { border-color: var(--border); color: var(--text-soft); }

.timeline-toolbar { background: color-mix(in srgb, var(--bg) 92%, transparent); }
.event-row-link:hover h2 { color: var(--text); }
.tag, .aside-tags a { background: var(--surface); }

.page-intro,
.event-header,
.definition-article > header,
.company-article > header,
.topic-hero,
.about-page-content > header,
.model-family-header {
  border-color: var(--border);
  background: transparent;
}
.page-intro h1,
.event-title-grid h1,
.definition-article h1,
.company-title h1,
.topic-hero h1,
.about-page-content h1,
.model-family-title h1 {
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: -.055em;
}
.page-intro > p,
.event-subtitle,
.definition-one-liner,
.company-article > header > p,
.topic-hero > p,
.model-family-title > div > p { color: var(--text-soft); font-family: var(--sans); }

.concept-index > a,
.company-index > a,
.topic-directory > a,
.related-events > div:last-child a,
.topic-timeline > a,
.source-list li,
.event-pagination,
.company-route,
.company-models { border-color: var(--border); }
.concept-index > a:hover,
.company-index > a:hover,
.topic-directory > a:hover,
.topic-timeline > a:hover,
.related-events > div:last-child a:hover {
  background: color-mix(in srgb, var(--accent) 9%, transparent);
}

.topic-band { background: var(--surface); color: var(--text); }
.topic-band .split-heading > p,
.topic-index p,
.topic-index a > span { color: var(--text-muted); }
.topic-index,
.topic-index a { border-color: var(--border); }
.topic-index a::before { background: var(--accent-strong); }
.topic-band > .section-link { color: var(--text); }

.lead-summary,
.before-after-section,
.misunderstanding-section,
.event-aside,
.definition-aside,
.source-empty { border-color: var(--border); background: var(--surface); }
.prose-section p,
.impact-list p,
.about-page-content section p,
.about-page-content li { color: var(--text-soft); }
.why-section { border-color: var(--accent); }
.status-dot.verified { background: var(--success); }

.search-dialog { color: var(--text); }
.search-dialog::backdrop { background: color-mix(in srgb, #02050a 72%, transparent); }
.search-panel { border-color: var(--border); background: var(--surface); box-shadow: var(--shadow); }
.search-field-wrap, .search-result { border-color: var(--border); }
.search-field-wrap input { color: var(--text); }
.search-hint button { border-color: var(--border); background: var(--surface-2); color: var(--text-soft); }
.search-result:hover { background: color-mix(in srgb, var(--accent) 9%, transparent); }

/* Model lineage */
.model-family-index,
.model-release-list,
.company-models {
  width: min(100%, calc(var(--max) + var(--gutter) * 2));
  margin: 0 auto;
  padding-right: var(--gutter);
  padding-left: var(--gutter);
}
.model-family-index { padding-bottom: 120px; }
.model-family-row {
  min-height: 142px;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 44px minmax(280px, 1fr) 120px minmax(180px, .48fr) 22px;
  gap: 28px;
  align-items: center;
  transition: padding 180ms ease, background 180ms ease;
}
.model-family-row:first-child { border-top: 1px solid var(--border-strong); }
.model-family-row:hover { padding-right: 16px; padding-left: 16px; background: color-mix(in srgb, var(--accent) 9%, transparent); }
.model-family-row > span { color: var(--text-muted); font: 500 10px var(--mono); }
.model-family-row h2 { margin: 0; font: 600 24px/1.25 var(--sans); letter-spacing: -.035em; }
.model-family-row p { max-width: 640px; margin: 8px 0 0; color: var(--text-muted); font-size: 12px; line-height: 1.65; }
.model-family-row small { color: var(--text-muted); font: 500 10px var(--mono); }
.model-family-row > b { color: var(--text-soft); font-size: 12px; font-weight: 500; }

.model-family-header {
  width: min(100%, calc(var(--max) + var(--gutter) * 2));
  margin: 0 auto;
  padding: 74px var(--gutter) 70px;
  border-bottom: 1px solid var(--border);
}
.model-family-title { margin-top: 54px; display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 70px; align-items: end; }
.model-family-title h1 { max-width: 850px; margin: 0; font-size: clamp(44px, 5.2vw, 72px); line-height: 1.05; }
.model-family-title > div > p { max-width: 760px; margin: 22px 0 0; font-size: 16px; line-height: 1.82; }
.model-family-title aside { padding-left: 24px; border-left: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
.model-family-title aside > span { color: var(--text-muted); font: 500 10px var(--mono); }
.model-family-title aside b { font-size: 14px; font-weight: 600; line-height: 1.5; }
.model-family-title aside small { color: var(--text-muted); font: 400 10px var(--mono); }
.model-release-list { padding-top: 84px; padding-bottom: 130px; }
.model-release-list > header { padding-bottom: 22px; border-bottom: 1px solid var(--border-strong); display: flex; align-items: baseline; justify-content: space-between; }
.model-release-list > header span { color: var(--accent); font: 500 10px var(--mono); }
.model-release-list > header h2 { margin: 0; font: 600 28px var(--sans); letter-spacing: -.04em; }
.model-release {
  min-height: 132px;
  border-bottom: 1px solid var(--border);
  display: grid;
  grid-template-columns: 42px 130px minmax(0, 1fr) 88px 30px;
  gap: 24px;
  align-items: center;
}
.model-release > span, .model-release time { color: var(--text-muted); font: 500 10px var(--mono); }
.model-release h3 { margin: 0; font: 600 20px/1.35 var(--sans); letter-spacing: -.02em; }
.model-release p { max-width: 700px; margin: 8px 0 0; color: var(--text-muted); font-size: 12px; line-height: 1.7; }
.model-status { width: max-content; padding: 5px 7px; border: 1px solid var(--border); color: var(--text-muted); font: 500 8px var(--mono); text-transform: uppercase; }
.model-status-current { border-color: color-mix(in srgb, var(--success) 70%, var(--border)); color: var(--success); }
.model-status-preview { border-color: color-mix(in srgb, var(--accent) 70%, var(--border)); color: var(--accent); }
.model-release > a { color: var(--text-muted); }
.model-release > a:hover { color: var(--accent); }

.company-models { padding-top: 72px; padding-bottom: 72px; border-top: 1px solid var(--border); display: grid; grid-template-columns: minmax(230px, .65fr) minmax(0, 1.3fr); gap: 60px; }
.company-models h2 { margin: 8px 0 0; font: 600 32px var(--sans); letter-spacing: -.04em; }
.company-models > div:last-child { border-top: 1px solid var(--border); }
.company-models a { min-height: 92px; border-bottom: 1px solid var(--border); display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, .55fr) 24px; gap: 20px; align-items: center; }
.company-models a > span { font-size: 16px; font-weight: 600; }
.company-models a small { color: var(--text-muted); font-size: 11px; }
.company-models a:hover { color: var(--accent); }

html[data-lang='en'] body { letter-spacing: -.006em; }
html[data-lang='en'] .timeline-title h1,
html[data-lang='en'] .page-intro h1,
html[data-lang='en'] .model-family-title h1 { letter-spacing: -.065em; }

@media (max-width: 1020px) {
  .model-family-row { grid-template-columns: 36px minmax(0, 1fr) minmax(160px, .45fr) 22px; }
  .model-family-row > small { display: none; }
  .model-family-title { grid-template-columns: minmax(0, 1fr) 230px; gap: 40px; }
}

@media (max-width: 760px) {
  .header-actions { margin-left: auto; }
  .search-trigger { display: none; }
  .utility-trigger { width: 36px; height: 36px; }
  .language-trigger { width: 40px; }
  .model-family-index { padding-bottom: 80px; }
  .model-family-row { min-height: 156px; padding: 24px 0; grid-template-columns: 28px minmax(0, 1fr) 20px; gap: 12px; }
  .model-family-row:hover { padding-right: 0; padding-left: 0; }
  .model-family-row > b { grid-column: 2; }
  .model-family-row > svg { grid-column: 3; grid-row: 1 / span 2; }
  .model-family-title { margin-top: 34px; grid-template-columns: 1fr; gap: 34px; }
  .model-family-title h1 { font-size: 44px; }
  .model-family-title aside { padding-top: 18px; padding-left: 0; border-top: 1px solid var(--border); border-left: 0; }
  .model-release-list { padding-top: 56px; padding-bottom: 90px; }
  .model-release { min-height: 174px; padding: 24px 0; grid-template-columns: 30px minmax(0, 1fr) 22px; gap: 8px 12px; }
  .model-release time { grid-column: 2; grid-row: 1; }
  .model-release > div { grid-column: 2; grid-row: 2; }
  .model-status { grid-column: 2; grid-row: 3; }
  .model-release > a { grid-column: 3; grid-row: 1 / span 3; }
  .model-release > span { grid-row: 1 / span 3; }
  .company-models { grid-template-columns: 1fr; gap: 28px; }
  .company-models a { grid-template-columns: minmax(0, 1fr) 20px; }
  .company-models a small { grid-column: 1; }
  .company-models a svg { grid-column: 2; grid-row: 1 / span 2; }
}