/* 弱者生存之道 · 宣纸 墨字 朱砂 */
:root {
  --paper: #f5f2ea;
  --card: #fcfbf6;
  --ink: #2e2c27;
  --ink2: #6f6a5f;
  --line: #ddd5c5;
  --cinnabar: #9e3b2a;
  --cinnabar-deep: #7c2d1f;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, SimSun, Georgia, serif;
  --kai: "Kaiti SC", STKaiti, KaiTi, "Noto Serif SC", "Source Han Serif SC", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  margin: 0;
  background:
    radial-gradient(1200px 500px at 50% -80px, rgba(255, 255, 255, .55), transparent 70%),
    var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 2;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--cinnabar); color: var(--paper); }

a { color: inherit; text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 4px; }
a:hover { color: var(--cinnabar); text-decoration-color: var(--cinnabar); }
:focus-visible { outline: 2px solid var(--cinnabar); outline-offset: 3px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }


/* 微信分享图标：离屏但可被抓取（不能 display:none） */
.wx-share-img { position: absolute; left: -9999px; top: 0; width: 400px; height: 400px; }

/* ---------- 页眉 ---------- */
.site-head { border-bottom: 1px solid var(--line); background: rgba(252, 251, 246, .6); }
.head-in { display: flex; align-items: center; justify-content: space-between; padding-top: 14px; padding-bottom: 14px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand:hover { color: var(--cinnabar); }
.seal { display: inline-block; width: 26px; height: 26px; }
.seal svg { display: block; width: 100%; height: 100%; }
.brand-t { font-family: var(--kai); font-size: 16px; letter-spacing: .18em; }
.head-nav { display: flex; align-items: center; gap: 14px; font-size: 13.5px; color: var(--ink2); }
.crumb { font-family: var(--kai); letter-spacing: .1em; }
.crumb-sep { color: var(--line); }
.toc-link { text-decoration: none; border-bottom: 1px solid var(--line); padding-bottom: 2px; }
.toc-link:hover { border-color: var(--cinnabar); }

/* ---------- 首页 ---------- */
.hero { position: relative; text-align: center; padding: 92px 0 64px; }
.hero-seal { width: 54px; height: 54px; margin-bottom: 28px; }
.hero-tagline { font-family: var(--kai); font-size: 14px; letter-spacing: .3em; color: var(--ink2); margin: 0 0 30px; }
.hero-title { font-size: clamp(34px, 10.5vw, 72px); font-weight: 600; letter-spacing: .16em; margin: 0 0 18px; text-indent: .16em; }
.hero-sub { font-family: var(--kai); font-size: clamp(17px, 3vw, 22px); color: var(--cinnabar); letter-spacing: .14em; margin: 0; }
.hero-rule { display: flex; align-items: center; justify-content: center; gap: 12px; margin: 38px auto 30px; max-width: 320px; }
.hero-rule i { flex: 1; height: 1px; background: var(--line); }
.hero-rule b { width: 7px; height: 7px; background: var(--cinnabar); transform: rotate(45deg); }
.hero-judgement { display: inline-block; border: 1px solid var(--line); background: var(--card); padding: 14px 30px; font-family: var(--kai); font-size: 16.5px; letter-spacing: .06em; margin: 0; }
.hero-meta { font-size: 14px; color: var(--ink2); letter-spacing: .2em; margin: 30px 0 0; }
.hero-cta { margin: 40px 0 0; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-block; border: 1px solid var(--ink); padding: 11px 34px; text-decoration: none; letter-spacing: .28em; text-indent: .28em; font-size: 14.5px; transition: all .2s ease; }
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.ghost { border-color: var(--line); color: var(--ink2); }
.btn.ghost:hover { border-color: var(--ink); color: var(--ink); background: transparent; }

.hero-side { position: absolute; right: -8px; top: 50%; transform: translateY(-50%); writing-mode: vertical-rl; font-family: var(--kai); font-size: 15px; letter-spacing: .55em; color: var(--ink2); opacity: .55; display: flex; gap: 18px; }
.hero-side span + span { margin-top: 2.2em; }
@media (max-width: 1080px) { .hero-side { display: none; } }

/* ---------- 目录 ---------- */
.toc { padding: 26px 0 30px; }
.toc-title { grid-column: 1 / -1; text-align: center; font-size: 26px; font-weight: 600; letter-spacing: .5em; text-indent: .5em; margin: 0 0 42px; }
.toc-title span { color: var(--cinnabar); }
.toc-grid, .toc { display: grid; gap: 22px; }
.toc { grid-template-columns: 1fr; }
@media (min-width: 900px) { .toc { grid-template-columns: 1fr 1fr; } .toc-card.wide { grid-column: 1 / -1; } }
.toc-card { background: var(--card); border: 1px solid var(--line); padding: 26px 30px 18px; }
.toc-card-head { display: flex; align-items: baseline; gap: 14px; border-bottom: 1px solid var(--line); padding-bottom: 12px; margin-bottom: 6px; }
.g-label { font-family: var(--kai); font-size: 13px; color: var(--cinnabar); letter-spacing: .2em; }
.g-name { font-size: 19px; font-weight: 600; letter-spacing: .3em; }
.toc-card ul { list-style: none; margin: 0; padding: 0; }
.toc-card li + li { border-top: 1px dashed var(--line); }
.toc-card a { display: block; padding: 13px 2px; text-decoration: none; }
.toc-no { font-family: var(--kai); font-size: 12.5px; color: var(--cinnabar); letter-spacing: .12em; display: inline-block; min-width: 4.2em; }
.toc-t { font-weight: 600; font-size: 16px; letter-spacing: .08em; }
.toc-s { display: block; font-size: 13px; color: var(--ink2); margin-top: 2px; padding-left: 4.6em; }
.toc-card a:hover .toc-t { color: var(--cinnabar); }
.toc-card a:hover .toc-no { color: var(--ink); }

/* ---------- 章节页 ---------- */
.chapter { max-width: 700px; }
.ch-head { text-align: center; padding: 64px 0 10px; }
.ch-no { font-family: var(--kai); font-size: 14px; color: var(--cinnabar); letter-spacing: .35em; text-indent: .35em; margin: 0 0 14px; }
.ch-title { font-size: clamp(30px, 6vw, 40px); font-weight: 600; letter-spacing: .14em; text-indent: .14em; margin: 0 0 12px; }
.ch-sub { font-family: var(--kai); font-size: 17px; color: var(--ink2); letter-spacing: .1em; margin: 0; }

.classic-quote { margin: 44px auto 10px; max-width: 32em; text-align: center; position: relative; padding: 8px 30px; }
.classic-quote::before, .classic-quote::after { font-family: var(--kai); font-size: 30px; color: var(--cinnabar); opacity: .75; position: absolute; line-height: 1; }
.classic-quote::before { content: "「"; left: -6px; top: 0; }
.classic-quote::after { content: "」"; right: -6px; bottom: 0; }
.quote-text { font-family: var(--kai); font-size: 20px; letter-spacing: .08em; line-height: 2.1; }
.classic-quote cite { display: block; font-style: normal; font-size: 13px; color: var(--ink2); letter-spacing: .2em; margin-top: 12px; }
.classic-quote cite::before { content: "—— "; }

.summary { background: var(--card); border-left: 2px solid var(--cinnabar); padding: 16px 22px; margin: 40px 0 8px; }
.summary-tag { display: inline-block; background: var(--cinnabar); color: var(--paper); font-family: var(--kai); font-size: 12px; letter-spacing: .25em; text-indent: .25em; padding: 2px 9px; border-radius: 2px; margin-bottom: 8px; }
.summary p { margin: 0 0 8px; font-size: 15px; line-height: 1.95; color: var(--ink2); }
.summary p:last-child { margin-bottom: 0; }

.ch-content { padding-bottom: 10px; }
.sec { margin-top: 2.4em; }
.sec h2 { font-size: 20px; font-weight: 600; letter-spacing: .1em; margin: 1.8em 0 1em; }
.sec-no { font-family: var(--kai); color: var(--cinnabar); margin-right: .55em; font-weight: 500; }
.ch-content > p, .sec p { margin: 0 0 1.4em; text-align: justify; }

.sec.boundary { border: 1px solid var(--line); background: var(--card); padding: 6px 26px 14px; margin-top: 2.6em; position: relative; }
.sec.boundary::before { content: "界"; position: absolute; top: -13px; left: 20px; background: var(--cinnabar); color: var(--paper); font-family: var(--kai); font-size: 13px; padding: 2px 10px; border-radius: 2px; letter-spacing: 0; }

.list-label { font-family: var(--kai); color: var(--cinnabar); font-size: 16.5px; letter-spacing: .1em; margin: 2.2em 0 1em; }
.list-label::before { content: ""; display: inline-block; width: 7px; height: 7px; background: var(--cinnabar); transform: rotate(45deg); margin-right: 12px; vertical-align: 2px; }

/* 表格 */
.tbl-wrap { overflow-x: auto; margin: 1.6em 0 2em; }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; line-height: 1.8; }
th { font-family: var(--kai); font-weight: 600; font-size: 14px; letter-spacing: .1em; text-align: left; padding: 10px 14px; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--card); white-space: nowrap; }
td { padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
tbody tr:last-child td { border-bottom: 2px solid var(--ink); }
.cell-line { display: block; }
.cell-line + .cell-line { margin-top: 6px; }

/* 篇尾 */
.ch-foot { margin-top: 3.6em; }
.note { font-size: 13px; color: var(--ink2); border-top: 1px solid var(--line); padding-top: 14px; line-height: 1.9; }
.signature { font-family: var(--kai); text-align: right; color: var(--ink2); letter-spacing: .4em; margin: 26px 0 0; font-size: 15px; }

/* 上下篇 */
.pn-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 3.6em 0 0; }
.pn { display: block; background: var(--card); border: 1px solid var(--line); padding: 16px 20px; text-decoration: none; min-height: 92px; }
.pn:hover { border-color: var(--cinnabar); }
.pn-empty { border-style: dashed; opacity: .4; }
.pn-label { font-family: var(--kai); font-size: 12px; color: var(--ink2); letter-spacing: .3em; }
.pn-title { display: block; font-weight: 600; font-size: 16px; margin: 6px 0 2px; }
.pn-sub { display: block; font-size: 13px; color: var(--ink2); }
.pn.next { text-align: right; }
.pn:hover .pn-title { color: var(--cinnabar); }
.back-toc { text-align: center; font-size: 13px; margin: 26px 0 0; color: var(--ink2); }
.back-toc a { margin: 0 8px; }

/* ---------- 页脚 ---------- */
.site-foot { border-top: 1px solid var(--line); margin-top: 90px; padding: 40px 0 52px; text-align: center; }
.foot-book { font-family: var(--kai); font-size: 14.5px; letter-spacing: .1em; color: var(--ink2); margin: 0 0 14px; }
.foot-meta { font-size: 13px; margin: 0 0 6px; }
.foot-contact { font-size: 12px; color: var(--ink2); opacity: .85; margin: 0; letter-spacing: .08em; }

/* ---------- 404 ---------- */
.err { text-align: center; padding: 90px 0 40px; }
.err-no { font-family: var(--kai); font-size: 44px; letter-spacing: .3em; text-indent: .3em; color: var(--ink2); margin: 0 0 40px; }
.err .classic-quote { margin-bottom: 50px; }


/* ---------- 题图 / 卷首图 / 数据图 ---------- */
.ch-figure { margin: 30px 0 6px; }
.ch-figure img, .hero-figure img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--line); border-radius: 2px;
  background: var(--card);
}
.hero-figure { margin: 8px 0 26px; }
.chart-figure {
  margin: 2em 0 2.2em; background: var(--card);
  border: 1px solid var(--line); padding: 20px 20px 10px;
}
.chart-figure svg { display: block; width: 100%; height: auto; }
.chart-figure figcaption {
  text-align: center; font-family: var(--kai); font-size: 13px;
  color: var(--ink2); letter-spacing: .14em; padding: 12px 0 8px;
}
.chart-figure figcaption::before { content: ""; display: inline-block; width: 6px; height: 6px; background: var(--cinnabar); transform: rotate(45deg); margin-right: 12px; vertical-align: 1px; }

@media print { .ch-figure, .chart-figure, .hero-figure { break-inside: avoid; } }
@media (max-width: 640px) {
  .chart-figure { padding: 12px 10px 6px; }
  .ch-figure { margin: 24px 0 4px; }
}

/* ---------- 响应式 & 打印 ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero-tagline { font-size: 12px; letter-spacing: .16em; }
  .hero { padding: 64px 0 48px; }
  .ch-head { padding-top: 44px; }
  .pn-nav { grid-template-columns: 1fr; }
  .pn.next { text-align: left; }
  .head-in { flex-wrap: wrap; gap: 8px; }
  .classic-quote { padding: 8px 10px; }
  .sec.boundary { padding: 6px 16px 10px; }
}
@media print {
  .site-head, .site-foot, .pn-nav, .back-toc, .hero-side { display: none; }
  body { background: #fff; }
}