/* ============ 基础 ============ */
:root {
  --paper: #f6f0e5;
  --paper-2: #efe6d5;
  --card: #fbf7ee;
  --ink: #26211b;
  --ink-2: #3d372f;
  --soft: #6f6655;
  --faint: #a89a7f;
  --line: #d8ccb4;
  --red: #a83f2b;
  --red-2: #8c3323;
  --teal: #33625c;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 2;
  -webkit-font-smoothing: antialiased;
  opacity: 0;
  transition: opacity .7s ease;
}
body.ready { opacity: 1; }

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .55;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/><feColorMatrix type='saturate' values='0'/></filter><rect width='240' height='240' filter='url(%23n)' opacity='0.045'/></svg>");
}

::selection { background: var(--red); color: #fff; }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--paper); }
::-webkit-scrollbar-thumb { background: #c7b99c; border-radius: 5px; border: 2px solid var(--paper); }

/* ============ 阅读进度条 ============ */
#progress {
  position: fixed; top: 0; left: 0;
  height: 2px; width: 0;
  background: var(--red);
  z-index: 40;
}

/* ============ 页眉 ============ */
.mast {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 28px;
  background: rgba(246, 240, 229, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-family: var(--serif); font-weight: 700; font-size: 18px;
  letter-spacing: 3px; text-decoration: none; color: var(--ink);
  line-height: 1.2;
}
.brand small {
  display: block;
  font-family: var(--sans); font-weight: 400;
  font-size: 9px; letter-spacing: 4px; color: var(--faint);
}
.ch-nav { display: flex; align-items: baseline; gap: 16px; }
.ch-nav a {
  font-family: var(--serif); font-size: 14px;
  color: var(--soft); text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .25s, border-color .25s;
  line-height: 1.4;
}
.ch-nav a:hover { color: var(--red); border-color: var(--red); }
.ch-nav a.here { color: var(--red); border-color: var(--red); font-weight: 600; }
.ch-nav .sep { color: var(--line); }

/* 西方卷：替换主色为黛蓝，与前卷朱砂红相区别 */
body.west { --red: #2f5f70; --red-2: #254b59; }

/* 卷内目录条 */
.track-nav {
  position: relative; z-index: 1;
  max-width: 720px; margin: 0 auto;
  padding: 24px 26px 0;
  display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: baseline;
}
.track-nav .t {
  font-family: var(--serif); letter-spacing: 4px; font-size: 13px;
  color: var(--red); white-space: nowrap;
}
.track-nav a {
  font-family: var(--serif); font-size: 14px; color: var(--soft);
  text-decoration: none; border-bottom: 1px solid transparent;
  transition: color .25s, border-color .25s;
}
.track-nav a:hover { color: var(--red); border-color: var(--red); }
.track-nav a.here { color: var(--ink); border-color: var(--red); font-weight: 600; }
.track-nav .sep { color: var(--line); }

/* 年代徽记 */
.eras { margin: 26px 0 4px; }
.eras .chip {
  display: inline-block;
  font-family: var(--serif); font-size: 12.5px; letter-spacing: 2px;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 3px 14px; margin: 0 8px 8px 0; color: var(--soft);
  background: var(--card);
}
.eras .chip b { color: var(--red); font-weight: 600; }

/* ============ 主栏 ============ */
main {
  position: relative; z-index: 1;
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 26px 110px;
}

/* ============ 章首 ============ */
.kicker {
  font-family: var(--serif); font-size: 13px; letter-spacing: 8px;
  color: var(--soft); text-transform: uppercase;
  margin-bottom: 18px;
}
h1 {
  font-family: var(--serif);
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 600; letter-spacing: 4px;
  line-height: 1.35; margin: 0 0 10px;
}
.lede {
  font-size: 17px; color: var(--ink-2); max-width: 560px; margin: 14px 0 0;
}
.chap-no {
  display: inline-block;
  font-family: var(--serif); font-size: 14px; letter-spacing: 5px;
  color: var(--red);
  border: 1px solid var(--red); border-radius: 2px;
  padding: 3px 14px; margin-bottom: 22px;
}

blockquote {
  margin: 36px 0;
  padding: 4px 0 4px 24px;
  border-left: 3px solid var(--red);
  font-family: var(--serif); font-size: 18px; line-height: 2;
  color: var(--ink-2);
}
blockquote footer {
  margin-top: 8px;
  font-family: var(--sans); font-size: 13px; letter-spacing: 1px;
  color: var(--faint);
}

/* ============ 线稿插图 ============ */
.art { margin: 34px 0 40px; }
.art svg { width: 100%; height: auto; display: block; }
.art path {
  fill: none; stroke: var(--ink);
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.art path.dull { stroke: var(--soft); stroke-width: 1.6; }
.art path.thin { stroke-width: 1.2; }
.art path.thk { stroke-width: 2.6; }
.art path.fred { fill: var(--red); stroke: none; }
.art path.fred2 { fill: var(--red); stroke: none; opacity: .28; }
.art path.fink { fill: var(--ink); stroke: none; opacity: .06; }
.art text { font-family: var(--serif); fill: var(--red); font-weight: 700; }

/* ============ 章节内容 ============ */
section { margin-top: 62px; }
h2 {
  font-family: var(--serif); font-size: 25px; letter-spacing: 3px;
  font-weight: 600; margin: 0 0 16px;
  display: flex; align-items: baseline; gap: 14px;
}
h2 .no {
  font-family: var(--serif); font-size: 14px; letter-spacing: 4px;
  color: var(--red); white-space: nowrap;
}
h3 {
  font-family: var(--serif); font-size: 18px; font-weight: 600;
  letter-spacing: 2px; margin: 26px 0 8px;
}
p { margin: 14px 0; color: var(--ink-2); }
strong { color: var(--ink); font-weight: 700; }
em { font-style: normal; background: linear-gradient(transparent 62%, rgba(168,63,43,.16) 62%); }
a.inline { color: var(--red-2); text-decoration: underline; text-underline-offset: 3px; text-decoration-color: rgba(168,63,43,.4); }

.citation { color: var(--faint); font-size: 13px; }

/* 清单（权利清单等） */
.cl { list-style: none; padding: 0; margin: 22px 0; }
.cl li {
  display: flex; gap: 16px; align-items: baseline;
  padding: 13px 4px;
  border-bottom: 1px dashed var(--line);
}
.cl li:last-child { border-bottom: none; }
.cl .n {
  font-family: var(--serif); font-size: 17px; color: var(--red);
  min-width: 30px; letter-spacing: 1px;
}
.cl h4 { margin: 0; font-family: var(--serif); font-size: 16.5px; letter-spacing: 1px; }
.cl p { margin: 2px 0 0; font-size: 14.5px; color: var(--soft); line-height: 1.8; }

/* 要目（编号条目） */
.principles { margin: 22px 0; }
.principles .item {
  display: flex; gap: 20px; margin: 20px 0;
  padding-left: 2px;
}
.principles .n {
  font-family: var(--serif); font-size: 26px; color: var(--red);
  line-height: 1.3; min-width: 44px;
}
.principles h4 { margin: 2px 0 4px; font-family: var(--serif); font-size: 17.5px; letter-spacing: 1px; }
.principles p { margin: 4px 0 0; font-size: 15px; }

/* 表格 */
table { width: 100%; border-collapse: collapse; margin: 22px 0; font-size: 14.5px; }
th, td {
  border: 1px solid var(--line); padding: 10px 14px;
  text-align: left; vertical-align: top; line-height: 1.8;
}
th { font-family: var(--serif); background: var(--paper-2); letter-spacing: 2px; font-weight: 600; }

/* 过程线（投票旅程等） */
.steps { list-style: none; margin: 26px 0; padding: 0; }
.steps li {
  position: relative;
  padding: 0 0 26px 46px;
  border-left: 1px solid var(--line);
  margin-left: 16px;
}
.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }
.steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute; left: -20px; top: -2px;
  width: 38px; height: 38px;
  border: 1px solid var(--line); border-radius: 50%;
  background: var(--paper);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 12px; letter-spacing: 1px;
  color: var(--red);
}
.steps { counter-reset: step; }
.steps h4 { margin: 0 0 4px; font-family: var(--serif); font-size: 16.5px; letter-spacing: 1px; }
.steps p { margin: 0; font-size: 14.5px; color: var(--soft); }

/* 栏盒 */
.case, .myth, .think, .point {
  position: relative;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 4px;
  padding: 26px 26px 20px;
  margin: 30px 0;
}
.case .tag, .myth .tag, .think .tag, .point .tag {
  position: absolute; top: -12px; left: 20px;
  background: var(--paper);
  padding: 0 12px;
  font-family: var(--serif); font-size: 12.5px; letter-spacing: 5px;
  border: 1px solid var(--line); border-radius: 2px;
}
.case .tag { color: var(--teal); }
.myth .tag { color: var(--red); }
.think .tag { color: var(--red-2); }
.point .tag { color: var(--ink-2); }

/* 三问 */
.threeq { display: grid; gap: 14px; margin: 24px 0; }
@media (min-width: 640px) { .threeq { grid-template-columns: repeat(3, 1fr); } }
.threeq div {
  border: 1px solid var(--line); border-radius: 4px;
  padding: 18px 18px 14px; background: var(--card);
}
.threeq .q { font-family: var(--serif); font-size: 16px; color: var(--red); letter-spacing: 1px; }
.threeq p { margin: 6px 0 0; font-size: 13.5px; color: var(--soft); line-height: 1.9; }

/* 要点收束 */
.takeaways {
  margin-top: 70px;
  border: 1px solid var(--line); border-top: 3px solid var(--red);
  background: var(--card);
  padding: 24px 28px 20px;
}
.takeaways h3 { margin-top: 0; font-size: 17px; letter-spacing: 4px; }
.takeaways ul { margin: 10px 0 0; padding-left: 22px; }
.takeaways li { font-size: 15px; margin: 8px 0; color: var(--ink-2); }

/* ============ 首页 ============ */
.hero { margin: 30px 0 60px; }
.hero h1 { font-size: clamp(44px, 9vw, 76px); letter-spacing: 8px; margin: 8px 0 6px; }
.hero .sub {
  font-family: var(--serif); font-size: 18px; letter-spacing: 3px;
  color: var(--soft); margin: 0 0 26px;
}
.catalog { list-style: none; padding: 0; margin: 30px 0; }
.catalog li {
  display: flex; gap: 24px; align-items: baseline;
  padding: 24px 8px;
  border-bottom: 1px solid var(--line);
  transition: background .3s;
}
.catalog li:hover { background: rgba(0,0,0,.025); }
.catalog .num {
  font-family: var(--serif); font-size: 32px; color: var(--red);
  min-width: 60px; line-height: 1;
}
.catalog h3 { margin: 0; font-size: 21px; letter-spacing: 2px; }
.catalog p { margin: 5px 0 0; color: var(--soft); font-size: 14.5px; line-height: 1.9; }
.catalog .pages {
  font-size: 12px; color: var(--faint); letter-spacing: 2px;
  margin-left: auto; white-space: nowrap; font-family: var(--serif);
}
.three-band {
  display: grid; gap: 14px; margin: 50px 0;
}
@media (min-width: 640px) { .three-band { grid-template-columns: repeat(3, 1fr); } }
.three-band div {
  border-top: 3px solid var(--red);
  background: var(--card);
  border: 1px solid var(--line); border-top: 3px solid var(--red);
  border-radius: 4px; padding: 18px 20px;
}
.three-band .t { font-family: var(--serif); font-size: 15px; letter-spacing: 2px; }
.three-band p { margin: 6px 0 0; font-size: 13.5px; color: var(--soft); line-height: 1.9; }

.cta {
  text-align: center; margin: 70px 0 0;
  border: 1px solid var(--line); border-radius: 4px;
  background: var(--card); padding: 44px 24px;
}
.cta h2 { justify-content: center; margin-bottom: 10px; }
.cta p { color: var(--soft); max-width: 440px; margin: 0 auto 26px; }

/* 按钮 */
.btn {
  display: inline-block;
  font-family: var(--serif); font-size: 15px; letter-spacing: 3px;
  color: #fff; background: var(--red);
  padding: 12px 34px; border-radius: 2px;
  text-decoration: none;
  transition: background .3s, transform .3s;
}
.btn:hover { background: var(--red-2); transform: translateY(-2px); }
.btn.ghost {
  background: transparent; color: var(--ink);
  border: 1px solid var(--line);
}
.btn.ghost:hover { background: var(--paper-2); }

/* 首页选择入口 */
.paths { display: grid; gap: 22px; margin: 44px 0; }
@media (min-width: 760px) { .paths { grid-template-columns: 1fr 1fr; } }
.path {
  display: block; position: relative;
  border: 1px solid var(--line); background: var(--card);
  border-radius: 4px; padding: 30px 28px;
  text-decoration: none; color: var(--ink);
  transition: transform .35s, box-shadow .35s;
}
.path:hover { transform: translateY(-5px); box-shadow: 0 14px 34px rgba(38,33,27,.09); }
.path.cn { border-top: 4px solid var(--red); }
.path.us { border-top: 4px solid #2f5f70; }
.path .pt { font-family: var(--serif); font-size: 26px; letter-spacing: 5px; font-weight: 600; }
.path .pe { font-size: 12px; letter-spacing: 3px; color: var(--soft); margin-top: 4px; }
.path p { margin: 14px 0 18px; color: var(--soft); font-size: 14.5px; line-height: 1.9; }
.path .chip {
  display: inline-block; font-size: 12px;
  border: 1px solid var(--line); padding: 2px 11px; border-radius: 999px;
  margin: 0 6px 6px 0; color: var(--soft); letter-spacing: 1px;
}
.path .go {
  margin-top: 18px;
  font-family: var(--serif); font-size: 14px; letter-spacing: 4px;
  display: block;
}
.path.cn .go { color: var(--red); }
.path.us .go { color: #2f5f70; }

/* ============ 页码导航 ============ */
.pager {
  display: flex; justify-content: space-between; gap: 20px;
  margin-top: 90px; padding-top: 26px;
  border-top: 1px solid var(--line);
}
.pager a {
  font-family: var(--serif); font-size: 15px; letter-spacing: 1px;
  color: var(--soft); text-decoration: none;
  transition: color .25s;
  line-height: 1.7;
}
.pager a b { display: block; color: var(--ink); font-weight: 600; font-size: 17px; }
.pager a:hover { color: var(--red); }
.pager a:hover b { color: var(--red); }
.pager .next { text-align: right; }

/* ============ 页脚 ============ */
.site-foot {
  position: relative; z-index: 1;
  border-top: 1px solid var(--line);
  padding: 30px 26px 44px;
  text-align: center;
  color: var(--faint); font-size: 12.5px; letter-spacing: 1px; line-height: 2;
}

/* ============ 自测 ============ */
.q { margin: 34px 0; }
.q .question {
  font-family: var(--serif); font-size: 16.5px; letter-spacing: 1px;
  margin-bottom: 10px;
}
.q .question .qn { color: var(--red); margin-right: 8px; }
.q button {
  display: block; width: 100%; text-align: left;
  background: var(--card);
  border: 1px solid var(--line); border-radius: 4px;
  padding: 10px 16px; margin: 8px 0;
  font-family: var(--sans); font-size: 15px; color: var(--ink-2);
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.q button:hover { border-color: var(--red); }
.q button.right { border-color: var(--teal); background: rgba(51,98,92,.1); }
.q button.wrong { border-color: var(--red); background: rgba(168,63,43,.1); }
.q button:disabled { cursor: default; }
.q .explain {
  display: none;
  font-size: 14px; color: var(--soft);
  border-left: 3px solid var(--teal);
  padding: 6px 0 6px 16px; margin-top: 6px;
}
.q.done .explain { display: block; }
.score {
  text-align: center;
  font-family: var(--serif);
  font-size: 22px; letter-spacing: 3px;
  border: 1px solid var(--line); background: var(--card);
  padding: 26px; margin: 40px 0;
}
.score b { color: var(--red); font-size: 30px; }

/* ============ 动画 ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  filter: blur(6px);
  transition: opacity .9s ease, transform .9s cubic-bezier(.2, .7, .2, 1), filter .9s ease;
  transition-delay: calc(var(--i, 0) * 90ms);
}
.reveal.in { opacity: 1; transform: none; filter: none; }
.art path {
  stroke-dasharray: var(--len, 1000);
  stroke-dashoffset: var(--len, 1000);
}
.art.in path {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1.5s cubic-bezier(.4, 0, .2, 1) var(--d, 0ms);
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; filter: none; transition: none; }
  .art path { stroke-dashoffset: 0; }
  html { scroll-behavior: auto; }
}

/* ============ 响应式 ============ */
@media (max-width: 640px) {
  .mast { padding: 10px 16px; }
  .ch-nav { gap: 8px; }
  .ch-nav a { font-size: 13px; }
  .ch-nav .sep { display: none; }
  main { padding: 44px 18px 80px; }
  .catalog li { flex-wrap: wrap; gap: 8px 16px; }
  .catalog .num { min-width: 44px; font-size: 26px; }
  .catalog .pages { margin-left: 76px; }
  .principles .item { gap: 14px; }
  .principles .n { min-width: 34px; font-size: 22px; }
  blockquote { font-size: 16px; }
  .pager { flex-direction: column; }
  .pager .next { text-align: left; }
}