@charset "UTF-8";
/* 东西文明编年 · 设计系统
   纯本地、无外部字体与脚本依赖。浅色为默认，深色可选（localStorage 记忆）。
   色彩编码：朱砂 = 东方，靛青 = 西方，墨紫 = 交汇/全球。 */

:root {
  --paper: #f7f3ea;
  --paper-2: #fbf8f1;
  --card: #fffefa;
  --ink: #23262a;
  --ink-2: #4b4c4a;
  --muted: #7b7568;
  --rule: #ddd5c4;
  --rule-strong: #c9bda4;
  --east: #a53a2a;
  --east-deep: #7d2a1e;
  --east-bg: #f9ece7;
  --west: #2b4f86;
  --west-deep: #1e3b68;
  --west-bg: #eaf0f8;
  --bridge: #6a5688;
  --bridge-bg: #f1ecf6;
  --gold: #a98445;
  --shadow: 0 1px 2px rgba(40, 32, 18, .04), 0 8px 28px rgba(40, 32, 18, .06);
  --shadow-hover: 0 2px 6px rgba(40, 32, 18, .07), 0 14px 40px rgba(40, 32, 18, .11);
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --maxw: 1240px;
}

html[data-theme="dark"] {
  --paper: #14171b;
  --paper-2: #1a1e23;
  --card: #1e2329;
  --ink: #ece7dc;
  --ink-2: #c6c0b4;
  --muted: #8f8b82;
  --rule: #333a42;
  --rule-strong: #4a515a;
  --east: #e08a72;
  --east-deep: #f0a68f;
  --east-bg: #34211f;
  --west: #86aee6;
  --west-deep: #a9c6f0;
  --west-bg: #1c2940;
  --bridge: #b7a0d8;
  --bridge-bg: #2a2338;
  --gold: #d3ad6d;
  --shadow: 0 1px 2px rgba(0, 0, 0, .2), 0 8px 28px rgba(0, 0, 0, .22);
  --shadow-hover: 0 2px 6px rgba(0, 0, 0, .28), 0 14px 40px rgba(0, 0, 0, .34);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 86px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-variant-numeric: tabular-nums;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .5;
  background-image:
    radial-gradient(circle at 12% 8%, rgba(169, 132, 69, .07), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(43, 79, 134, .06), transparent 40%),
    linear-gradient(0deg, transparent 0, transparent 31px, rgba(120, 105, 80, .035) 32px),
    linear-gradient(90deg, transparent 0, transparent 31px, rgba(120, 105, 80, .035) 32px);
  background-size: auto, auto, 32px 32px, 32px 32px;
}
html[data-theme="dark"] body::before { opacity: .32; }

a { color: inherit; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }
::selection { background: rgba(169, 132, 69, .3); }

.wrap { width: min(100% - 48px, var(--maxw)); margin-inline: auto; }
.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; }
.mono { font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
.en { font-family: Georgia, "Times New Roman", serif; letter-spacing: .02em; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid var(--rule);
}
.header-inner { display: flex; align-items: center; gap: 28px; min-height: 64px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; flex: none; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 50%;
  border: 1px solid var(--rule-strong);
  background: linear-gradient(90deg, var(--east) 0 47%, var(--paper) 47% 53%, var(--west) 53% 100%);
  box-shadow: inset 0 0 0 3px var(--paper);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-family: var(--serif); font-size: 17px; letter-spacing: .1em; }
.brand-text small { font-size: 9px; letter-spacing: .19em; color: var(--muted); text-transform: uppercase; }
.site-nav { display: flex; gap: 4px; margin-left: auto; }
.site-nav a {
  padding: 7px 13px; border-radius: 6px; text-decoration: none;
  font-size: 13px; color: var(--ink-2); white-space: nowrap;
  transition: background .18s, color .18s;
}
.site-nav a:hover { background: var(--paper-2); color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); background: var(--paper-2); box-shadow: inset 0 -2px 0 var(--gold); }
.header-tools { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 34px; height: 34px; display: grid; place-items: center;
  border: 1px solid var(--rule); border-radius: 7px;
  background: var(--card); color: var(--ink-2);
  font-size: 15px; line-height: 1;
  transition: border-color .18s, transform .18s, color .18s;
}
.icon-btn:hover { border-color: var(--gold); color: var(--ink); transform: translateY(-1px); }

/* ---------- Hero ---------- */
.hero { padding: 68px 0 30px; position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 56px; align-items: end; }
.eyebrow { font-size: 11px; letter-spacing: .22em; text-transform: uppercase; color: var(--gold); margin: 0 0 20px; }
.hero h1 {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(38px, 5.4vw, 68px); line-height: 1.12;
  letter-spacing: .04em; margin: 0 0 8px;
}
.hero h1 .split { display: inline-block; }
.hero h1 .e { color: var(--east); }
.hero h1 .w { color: var(--west); }
.hero-sub { font-family: var(--serif); font-size: clamp(16px, 1.7vw, 21px); color: var(--ink-2); margin: 0 0 20px; letter-spacing: .03em; }
.hero-desc { max-width: 720px; color: var(--ink-2); font-size: 14px; line-height: 1.95; margin: 0 0 26px; }
.hero-figures { display: flex; gap: 34px; flex-wrap: wrap; }
.figure { display: flex; flex-direction: column; }
.figure b { font-family: var(--serif); font-size: 30px; font-weight: 500; line-height: 1.1; }
.figure span { font-size: 11px; letter-spacing: .1em; color: var(--muted); }
.hero-side {
  border-left: 1px solid var(--rule); padding-left: 24px;
  font-size: 12.5px; color: var(--ink-2); line-height: 1.9;
}
.hero-side h2 { font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; font-weight: 600; }
.legend { display: flex; align-items: center; gap: 9px; margin-bottom: 8px; }
.legend i { width: 22px; height: 3px; border-radius: 2px; flex: none; }
.legend.e i { background: var(--east); }
.legend.w i { background: var(--west); }
.legend.b i { background: var(--bridge); }
.hero-side .fine { color: var(--muted); font-size: 11px; margin-top: 14px; line-height: 1.7; }

/* ---------- 时间带 ---------- */
.band-section { padding: 28px 0 8px; }
.section-label { display: flex; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.section-label h2 { font-family: var(--serif); font-size: 16px; font-weight: 500; letter-spacing: .08em; margin: 0; }
.section-label small { font-size: 11px; color: var(--muted); letter-spacing: .05em; }
.band {
  position: relative; height: 76px;
  border: 1px solid var(--rule); border-radius: 8px;
  background: var(--card); overflow: hidden;
}
.band-track { position: absolute; inset: 0; }
.band-era {
  position: absolute; top: 0; bottom: 22px;
  border-right: 1px solid color-mix(in srgb, var(--card) 65%, transparent);
  display: flex; flex-direction: column; justify-content: center;
  padding: 0 6px; text-decoration: none; overflow: hidden;
  transition: filter .18s, transform .18s;
}
.band-era:hover { filter: brightness(1.08); z-index: 2; }
.band-era:focus-visible { z-index: 3; }
.band-era .bn { font-family: var(--serif); font-size: 12px; line-height: 1.2; white-space: nowrap; text-align: center; display: block; }
.band-era .by { display: none; }
.band-era.e { background: var(--east-bg); color: var(--east-deep); }
.band-era.w { background: var(--west-bg); color: var(--west-deep); }
.band-era.e:hover { color: var(--east-deep); }
.band-era.w:hover { color: var(--west-deep); }
.band-scale { position: absolute; left: 0; right: 0; bottom: 0; height: 22px; border-top: 1px solid var(--rule); background: var(--paper-2); }
.band-tick { position: absolute; top: 0; bottom: 0; border-left: 1px solid var(--rule-strong); }
.band-tick span { position: absolute; top: 3px; left: 4px; font-size: 9px; color: var(--muted); white-space: nowrap; }
.band-tick--now { left: auto; right: 0; border-left: 0; border-right: 1px solid var(--rule-strong); }
.band-tick--now span { left: auto; right: 4px; color: var(--gold); }
.era-links { display: grid; grid-template-columns: repeat(9, minmax(0, 1fr)); gap: 4px; margin-top: 10px; }
.era-links a {
  text-decoration: none; font-size: 11px; line-height: 1.4; color: var(--ink-2);
  border: 1px solid var(--rule); border-radius: 5px; background: var(--card);
  padding: 7px 6px; text-align: center;
  transition: border-color .18s, color .18s, background .18s;
}
.era-links a b { color: var(--gold); font-family: var(--serif); font-weight: 500; margin-right: 3px; }
.era-links a:hover { border-color: var(--gold); color: var(--ink); background: var(--paper-2); }
.band-note { font-size: 11px; color: var(--muted); margin: 9px 0 0; }

/* ---------- 文明同时性 ---------- */
.snapshot { padding: 34px 0 10px; }
.snap-box {
  border: 1px solid var(--rule); border-radius: 10px; background: var(--card);
  box-shadow: var(--shadow); padding: 24px 26px;
}
.snap-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 6px; }
.snap-head h2 { font-family: var(--serif); font-size: 19px; font-weight: 500; margin: 0; letter-spacing: .05em; }
.snap-head p { margin: 0; font-size: 12px; color: var(--muted); }
.snap-controls { display: flex; align-items: center; gap: 16px; margin: 18px 0 6px; }
.year-input {
  width: 108px; padding: 8px 10px; text-align: center;
  border: 1px solid var(--rule-strong); border-radius: 6px; background: var(--paper-2);
  font-family: var(--serif); font-size: 19px;
}
.snap-controls input[type="range"] { flex: 1; accent-color: var(--gold); min-width: 120px; }
.snap-presets { display: flex; gap: 7px; flex-wrap: wrap; margin: 8px 0 18px; }
.snap-presets button {
  border: 1px solid var(--rule); background: var(--paper-2); color: var(--ink-2);
  border-radius: 20px; padding: 4px 11px; font-size: 11.5px;
}
.snap-presets button:hover { border-color: var(--gold); color: var(--ink); }
.snap-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.snap-card { border: 1px solid var(--rule); border-left-width: 3px; border-radius: 7px; padding: 13px 16px; background: var(--paper-2); min-height: 104px; }
.snap-card.e { border-left-color: var(--east); }
.snap-card.w { border-left-color: var(--west); }
.snap-card .k { font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: var(--muted); }
.snap-card .yr { font-family: var(--serif); font-size: 15px; color: var(--east); margin: 4px 0 2px; }
.snap-card.w .yr { color: var(--west); }
.snap-card .ti { font-family: var(--serif); font-size: 16px; line-height: 1.45; }
.snap-card .pl { font-size: 11px; color: var(--muted); margin-top: 4px; }
.snap-foot { font-size: 11.5px; color: var(--muted); margin: 14px 0 0; }

/* ---------- 筛选工具条 ---------- */
.toolbar {
  position: sticky; top: 64px; z-index: 40;
  margin: 30px 0 0; padding: 13px 0;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(10px);
  border-block: 1px solid var(--rule);
}
.toolbar-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.search-wrap { position: relative; flex: 0 0 240px; width: 240px; }
.search-wrap input {
  width: 100%; padding: 8px 12px 8px 32px;
  border: 1px solid var(--rule-strong); border-radius: 6px; background: var(--card);
  font-size: 13px;
}
.search-wrap::before { content: "⌕"; position: absolute; left: 11px; top: 4px; font-size: 18px; color: var(--muted); }
.chips { display: flex; gap: 6px; flex-wrap: nowrap; overflow-x: auto; flex: 0 0 100%; order: 2; padding-bottom: 2px; scrollbar-width: thin; }
.chip {
  border: 1px solid var(--rule); background: var(--card); color: var(--ink-2);
  padding: 5px 11px; border-radius: 20px; font-size: 12px; line-height: 1.5;
  flex: 0 0 auto; white-space: nowrap;
  transition: all .16s;
}
.chip:hover { border-color: var(--gold); }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.tool-right { display: flex; align-items: center; gap: 14px; margin-left: auto; order: 1; }
.toggle-label { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-2); cursor: pointer; white-space: nowrap; }
.toggle-label input { accent-color: var(--gold); }
.count { font-size: 12px; color: var(--muted); white-space: nowrap; }
.link-btn { border: 0; background: none; font-size: 12px; color: var(--west); text-decoration: underline; text-underline-offset: 3px; padding: 2px; }
html[data-theme="dark"] .link-btn { color: var(--west-deep); }

/* ---------- 时代与时间线 ---------- */
.eras { padding: 14px 0 60px; }
.era { scroll-margin-top: 96px; padding-top: 46px; }
.era[hidden], .event[hidden] { display: none !important; }
.era-head { display: grid; grid-template-columns: 74px minmax(0, 1fr); gap: 20px; align-items: start; margin-bottom: 26px; }
.era-no {
  font-family: var(--serif); font-size: 46px; line-height: 1;
  color: var(--gold); opacity: .75; letter-spacing: -.03em;
}
.era-head h2 { font-family: var(--serif); font-size: clamp(26px, 3vw, 34px); font-weight: 500; margin: 0 0 2px; letter-spacing: .05em; }
.era-en { font-family: Georgia, serif; font-size: 13px; letter-spacing: .13em; color: var(--muted); text-transform: uppercase; }
.era-meta { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 10px 0 0; font-size: 12px; color: var(--ink-2); }
.era-meta .span { font-family: var(--serif); font-size: 14px; color: var(--ink); }
.era-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--rule-strong); }
.era-lead { max-width: 860px; margin: 14px 0 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.95; }

.timeline { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 62px minmax(0, 1fr); }
.timeline::before {
  content: ""; position: absolute; top: 6px; bottom: 6px; left: 50%; width: 1px;
  transform: translateX(-50%); background: linear-gradient(var(--rule-strong), var(--rule) 90%, transparent);
}
.tl-col { display: flex; flex-direction: column; gap: 14px; padding-bottom: 6px; }
.tl-col--east { grid-column: 1; align-items: stretch; }
.tl-col--west { grid-column: 3; }
.tl-axis { grid-column: 2; position: relative; }
.axis-tick { position: absolute; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 4px; width: 62px; }
.axis-tick i { display: block; width: 7px; height: 7px; border-radius: 50%; background: var(--paper); border: 1px solid var(--rule-strong); }
.axis-tick span { font-size: 9px; color: var(--muted); white-space: nowrap; letter-spacing: .02em; }

.event {
  position: relative; border: 1px solid var(--rule); border-radius: 8px;
  background: var(--card); box-shadow: var(--shadow);
  padding: 15px 17px 14px; transition: box-shadow .2s, transform .2s, border-color .2s;
}
.event:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.event::after {
  content: ""; position: absolute; top: 22px; width: 13px; height: 1px; background: var(--rule-strong);
}
.tl-col--east .event::after { right: -14px; }
.tl-col--west .event::after { left: -14px; }
.event.e { border-top: 2px solid var(--east); }
.event.w { border-top: 2px solid var(--west); }
.event .yr { font-family: var(--serif); font-size: 14px; letter-spacing: .03em; color: var(--east); margin-bottom: 2px; }
.event.w .yr { color: var(--west); }
.event .ti { font-family: var(--serif); font-size: 17px; font-weight: 600; line-height: 1.45; margin: 0 0 2px; }
.event .pl { font-size: 11px; color: var(--muted); margin-bottom: 8px; letter-spacing: .04em; }
.event .de { font-size: 12.8px; line-height: 1.85; color: var(--ink-2); margin: 0; }
.event .tags { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 10px; }
.event .tags span { font-size: 10px; color: var(--muted); border: 1px solid var(--rule); border-radius: 3px; padding: 1px 6px; }
.event.key { background: linear-gradient(180deg, var(--east-bg) 0, var(--card) 62%); }
.event.w.key { background: linear-gradient(180deg, var(--west-bg) 0, var(--card) 62%); }
.event .star { position: absolute; right: 13px; top: 12px; font-size: 11px; color: var(--gold); letter-spacing: .06em; }
.event mark { background: rgba(169, 132, 69, .35); color: inherit; border-radius: 2px; padding: 0 1px; }

.bridge-row { grid-column: 1 / -1; display: flex; flex-direction: column; gap: 10px; margin: 16px 0 4px; }
.bridge-label { align-self: center; font-size: 10px; letter-spacing: .2em; color: var(--bridge); text-transform: uppercase; }
.event.b {
  border: 1px dashed color-mix(in srgb, var(--bridge) 55%, var(--rule));
  border-left: 3px solid var(--bridge);
  background: linear-gradient(90deg, var(--bridge-bg), var(--card) 70%);
  max-width: 780px; width: 100%; margin-inline: auto;
}
.event.b::after { display: none; }
.event.b .yr { color: var(--bridge); }
.event.b .ti { font-size: 16px; }
.event.b.key { background: linear-gradient(90deg, var(--bridge-bg), var(--card) 78%); }

.insight {
  grid-column: 1 / -1; margin: 26px 0 0;
  border: 1px solid var(--rule); border-radius: 9px;
  background: var(--paper-2);
  display: grid; grid-template-columns: 190px minmax(0, 1fr);
  overflow: hidden;
}
.insight-h { padding: 20px 22px; border-right: 1px solid var(--rule); background: linear-gradient(150deg, rgba(169,132,69,.10), transparent); }
.insight-h .k { font-size: 10px; letter-spacing: .18em; color: var(--gold); text-transform: uppercase; display: block; margin-bottom: 6px; }
.insight-h strong { font-family: var(--serif); font-size: 16px; font-weight: 600; line-height: 1.5; }
.insight p { margin: 0; padding: 20px 24px; font-size: 13.2px; line-height: 1.95; color: var(--ink-2); }
.era-empty { grid-column: 1 / -1; text-align: center; color: var(--muted); font-size: 13px; padding: 24px; border: 1px dashed var(--rule); border-radius: 8px; }

.no-result { display: none; text-align: center; padding: 70px 20px; color: var(--muted); }
.no-result.show { display: block; }

/* ---------- 结语 / CTA ---------- */
.closing { border-top: 1px solid var(--rule); padding: 48px 0 56px; }
.closing-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.closing h2 { font-family: var(--serif); font-size: 26px; font-weight: 500; margin: 0 0 12px; }
.closing p { color: var(--ink-2); font-size: 13.5px; line-height: 1.95; margin: 0 0 14px; }
.cta-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.cta {
  display: inline-flex; align-items: center; gap: 8px; text-decoration: none;
  border: 1px solid var(--rule-strong); border-radius: 6px; background: var(--card);
  padding: 9px 16px; font-size: 13px; color: var(--ink);
}
.cta:hover { border-color: var(--gold); }
.cta.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- 内页通用 ---------- */
.page-head { padding: 54px 0 26px; border-bottom: 1px solid var(--rule); }
.page-head .eyebrow { margin-bottom: 14px; }
.page-head h1 { font-family: var(--serif); font-size: clamp(30px, 4vw, 46px); font-weight: 500; margin: 0 0 8px; letter-spacing: .05em; }
.page-head p { max-width: 820px; color: var(--ink-2); font-size: 14px; line-height: 1.95; margin: 0; }
.toc { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 22px; }
.toc a { font-size: 12px; text-decoration: none; border: 1px solid var(--rule); border-radius: 20px; padding: 5px 12px; color: var(--ink-2); background: var(--card); }
.toc a:hover { border-color: var(--gold); color: var(--ink); }

/* ---------- 专题页 ---------- */
.themes { padding: 40px 0 70px; display: flex; flex-direction: column; gap: 30px; }
.theme-card { border: 1px solid var(--rule); border-radius: 10px; background: var(--card); box-shadow: var(--shadow); overflow: hidden; scroll-margin-top: 90px; }
.theme-head { display: flex; align-items: center; gap: 14px; padding: 18px 24px; border-bottom: 1px solid var(--rule); background: var(--paper-2); }
.theme-ico { width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--rule-strong); border-radius: 6px; color: var(--gold); font-size: 17px; flex: none; }
.theme-head h2 { font-family: var(--serif); font-size: 21px; font-weight: 500; margin: 0; letter-spacing: .04em; }
.theme-head .en { font-size: 11px; letter-spacing: .12em; color: var(--muted); text-transform: uppercase; }
.theme-q { margin-left: auto; font-size: 12px; color: var(--muted); text-align: right; font-family: var(--serif); }
.theme-body { display: grid; grid-template-columns: 1fr 1fr; }
.theme-cell { padding: 20px 24px; }
.theme-cell + .theme-cell { border-left: 1px solid var(--rule); }
.theme-cell .k { font-size: 10px; letter-spacing: .18em; text-transform: uppercase; margin-bottom: 8px; display: block; }
.theme-cell.e .k { color: var(--east); }
.theme-cell.w .k { color: var(--west); }
.theme-cell p { margin: 0; font-size: 13px; line-height: 1.95; color: var(--ink-2); }
.theme-encounter { padding: 16px 24px; border-top: 1px solid var(--rule); background: linear-gradient(90deg, var(--bridge-bg), transparent); font-size: 12.8px; line-height: 1.9; color: var(--ink-2); }
.theme-encounter b { color: var(--bridge); font-weight: 600; letter-spacing: .05em; margin-right: 8px; }
.theme-nodes { border-top: 1px solid var(--rule); }
.node-row { display: grid; grid-template-columns: 150px 1fr 1fr; font-size: 12.5px; border-bottom: 1px solid var(--rule); }
.node-row:last-child { border-bottom: 0; }
.node-row > div { padding: 10px 18px; }
.node-row .nt { font-family: var(--serif); color: var(--muted); border-right: 1px solid var(--rule); }
.node-row .ne { color: var(--east-deep); border-right: 1px solid var(--rule); }
.node-row .nw { color: var(--west-deep); }
.theme-card .jump { display: inline-block; margin: 0 24px 20px; font-size: 12px; color: var(--west); text-decoration: none; border-bottom: 1px solid currentColor; }
html[data-theme="dark"] .theme-card .jump { color: var(--west-deep); }

/* ---------- 方法页 ---------- */
.prose { padding: 40px 0 70px; max-width: 900px; }
.prose section { scroll-margin-top: 90px; margin-bottom: 46px; }
.prose h2 { font-family: var(--serif); font-size: 23px; font-weight: 500; margin: 0 0 6px; letter-spacing: .05em; }
.prose h2 .num { color: var(--gold); font-size: 14px; margin-right: 12px; letter-spacing: .1em; }
.prose h3 { font-size: 14px; margin: 24px 0 8px; color: var(--ink); }
.prose p { font-size: 13.5px; line-height: 2; color: var(--ink-2); margin: 0 0 12px; }
.prose ul { margin: 0 0 12px; padding-left: 22px; color: var(--ink-2); font-size: 13.5px; line-height: 2; }
.prose li { margin-bottom: 4px; }
.prose strong { color: var(--ink); }
.callout { border-left: 3px solid var(--gold); background: var(--paper-2); padding: 14px 18px; border-radius: 0 7px 7px 0; margin: 18px 0; }
.callout p { margin: 0; }
.def-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 18px 0; }
.def-card { border: 1px solid var(--rule); border-top: 2px solid var(--east); border-radius: 7px; padding: 16px 18px; background: var(--card); }
.def-card.w { border-top-color: var(--west); }
.def-card h3 { margin: 0 0 6px; font-size: 14px; }
.def-card p { font-size: 12.5px; margin: 0; line-height: 1.85; }
.src-group { border-top: 1px solid var(--rule); padding: 14px 0 4px; display: grid; grid-template-columns: 160px 1fr; gap: 18px; }
.src-group h3 { margin: 0; font-size: 13px; color: var(--gold); }
.src-group ul { margin: 0; padding-left: 20px; }
.src-group li { font-size: 13px; line-height: 1.9; }
.table-wrap { overflow-x: auto; margin: 16px 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: 12.5px; }
.prose th, .prose td { border: 1px solid var(--rule); padding: 8px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--paper-2); font-weight: 600; white-space: nowrap; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--rule); background: var(--paper-2); padding: 38px 0 30px; }
.footer-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr); gap: 36px; }
.site-footer h3 { font-family: var(--serif); font-size: 15px; font-weight: 600; margin: 0 0 10px; }
.site-footer p, .site-footer li { font-size: 12px; color: var(--muted); line-height: 1.9; margin: 0 0 6px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--east); text-decoration: underline; text-underline-offset: 3px; }
.footer-bottom { border-top: 1px solid var(--rule); margin-top: 28px; padding-top: 16px; display: flex; gap: 16px; flex-wrap: wrap; align-items: center; font-size: 11px; color: var(--muted); }
.footer-bottom a { color: var(--ink-2); }
.footer-bottom .sp { margin-left: auto; }
.contact-link { display: inline-flex; align-items: center; gap: 5px; }

.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 45;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid var(--rule-strong); background: var(--card); color: var(--ink-2);
  box-shadow: var(--shadow); font-size: 16px;
  opacity: 0; transform: translateY(8px); pointer-events: none;
  transition: opacity .25s, transform .25s;
}
.to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-side { border-left: 0; border-top: 1px solid var(--rule); padding-left: 0; padding-top: 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 20px; }
  .hero-side h2, .hero-side .fine { grid-column: 1 / -1; }
  .theme-q { display: none; }
}
@media (max-width: 860px) {
  .wrap { width: min(100% - 32px, var(--maxw)); }
  .header-inner { gap: 12px; min-height: 58px; }
  .brand-text small { display: none; }
  .site-nav a { padding: 6px 8px; font-size: 12px; }
  .toolbar { top: 58px; }
  .timeline { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); column-gap: 16px; }
  .tl-col--west { grid-column: 2; }
  .tl-axis { display: none; }
  .event::after { display: none; }
  .insight { grid-template-columns: 1fr; }
  .insight-h { border-right: 0; border-bottom: 1px solid var(--rule); padding: 14px 18px; }
  .insight p { padding: 16px 18px; }
  .node-row { grid-template-columns: 110px 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  body { font-size: 14px; }
  .header-inner { gap: 6px; }
  .brand { gap: 6px; }
  .brand-mark { width: 24px; height: 24px; }
  .brand-text strong { font-size: 14px; letter-spacing: .02em; }
  .site-nav { gap: 1px; }
  .site-nav a { padding: 5px 5px; font-size: 11px; }
  .icon-btn { width: 30px; height: 30px; font-size: 13px; }
  .hero { padding: 44px 0 18px; }
  .hero-figures { gap: 22px; }
  .hero-side { display: block; }
  .band { height: 68px; }
  .band-era .bn { font-size: 10px; }
  .band-era .by { display: none; }
  .era-links { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .section-label { flex-direction: column; align-items: flex-start; gap: 4px; }
  .section-label h2 { white-space: nowrap; }
  .snap-box { padding: 18px 16px; }
  .snap-controls { gap: 10px; }
  .snap-cards { grid-template-columns: 1fr; }
  .toolbar { padding: 8px 0; }
  .toolbar-row { gap: 8px; }
  .search-wrap { flex: 1 1 auto; width: auto; min-width: 0; }
  .tool-right { margin-left: auto; width: auto; flex: 0 0 auto; gap: 8px; order: 1; }
  .toggle-label { font-size: 11px; gap: 4px; }
  .chips { order: 3; flex: 0 0 100%; width: 100%; }
  .era { padding-top: 34px; }
  .era-head { grid-template-columns: 46px 1fr; gap: 12px; }
  .era-no { font-size: 32px; }
  .timeline { display: flex; flex-direction: column; gap: 16px; }
  .timeline::before { display: none; }
  .tl-col { gap: 12px; }
  .tl-col--east, .tl-col--west { grid-column: auto; }
  .col-label { display: block !important; }
  .bridge-row, .insight { margin-top: 4px; }
  .event { padding: 13px 14px; }
  .theme-body { grid-template-columns: 1fr; }
  .theme-cell + .theme-cell { border-left: 0; border-top: 1px solid var(--rule); }
  .node-row { grid-template-columns: 1fr; }
  .node-row > div { border-right: 0; border-bottom: 1px solid var(--rule); padding: 7px 14px; }
  .node-row > div:last-child { border-bottom: 0; }
  .node-row .nt { font-size: 11px; }
  .closing-grid, .def-grid { grid-template-columns: 1fr; gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .src-group { grid-template-columns: 1fr; gap: 6px; }
  .footer-bottom .sp { margin-left: 0; }
}
.col-label { display: none; font-size: 10px; letter-spacing: .18em; text-transform: uppercase; padding: 2px 0 6px; }
.col-label.e { color: var(--east); }
.col-label.w { color: var(--west); }

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

@media print {
  .site-header, .toolbar, .snapshot, .to-top, .cta-row, .band-section, .site-footer .footer-bottom { display: none !important; }
  body { background: #fff; color: #000; font-size: 10pt; }
  body::before { display: none; }
  .wrap { width: 100%; }
  .event, .theme-card, .insight, .snap-box { box-shadow: none; break-inside: avoid; }
  .era { break-before: page; }
  .timeline { grid-template-columns: 1fr 40px 1fr; }
  a { text-decoration: none; }
}